--- /dev/null
+#
+# Makefile for the Linux/Xtensa kernel.
+#
+
+extra-y := head.o vmlinux.lds
+
+
+obj-y := align.o entry.o irq.o coprocessor.o process.o ptrace.o semaphore.o \
+ setup.o signal.o syscalls.o time.o traps.o vectors.o platform.o \
+ pci-dma.o
+
+## windowspill.o
+
+obj-$(CONFIG_KGDB) += xtensa-stub.o
+obj-$(CONFIG_PCI) += pci.o
+obj-$(CONFIG_MODULES) += xtensa_ksyms.o module.o
+
+
--- /dev/null
+/*
+ * arch/xtensa/kernel/align.S
+ *
+ * Handle unalignment exceptions in kernel space.
+ *
+ * This file is subject to the terms and conditions of the GNU General
+ * Public License. See the file "COPYING" in the main directory of
+ * this archive for more details.
+ *
+ * Copyright (C) 2001 - 2005 Tensilica, Inc.
+ *
+ * Rewritten by Chris Zankel <chris@zankel.net>
+ *
+ * Based on work from Joe Taylor <joe@tensilica.com, joetylr@yahoo.com>
+ * and Marc Gauthier <marc@tensilica.com, marc@alimni.uwaterloo.ca>
+ */
+
+#include <linux/linkage.h>
+#include <asm/ptrace.h>
+#include <asm/ptrace.h>
+#include <asm/current.h>
+#include <asm/offsets.h>
+#include <asm/pgtable.h>
+#include <asm/processor.h>
+#include <asm/page.h>
+#include <asm/thread_info.h>
+
+#if XCHAL_UNALIGNED_LOAD_EXCEPTION || XCHAL_UNALIGNED_STORE_EXCEPTION
+
+/* First-level exception handler for unaligned exceptions.
+ *
+ * Note: This handler works only for kernel exceptions. Unaligned user
+ * access should get a seg fault.
+ */
+
+/* Big and little endian 16-bit values are located in
+ * different halves of a register. HWORD_START helps to
+ * abstract the notion of extracting a 16-bit value from a
+ * register.
+ * We also have to define new shifting instructions because
+ * lsb and msb are on 'opposite' ends in a register for
+ * different endian machines.
+ *
+ * Assume a memory region in ascending address:
+ * 0 1 2 3|4 5 6 7
+ *
+ * When loading one word into a register, the content of that register is:
+ * LE 3 2 1 0, 7 6 5 4
+ * BE 0 1 2 3, 4 5 6 7
+ *
+ * Masking the bits of the higher/lower address means:
+ * LE X X 0 0, 0 0 X X
+ * BE 0 0 X X, X X 0 0
+ *
+ * Shifting to higher/lower addresses, means:
+ * LE shift left / shift right
+ * BE shift right / shift left
+ *
+ * Extracting 16 bits from a 32 bit reg. value to higher/lower address means:
+ * LE mask 0 0 X X / shift left
+ * BE shift left / mask 0 0 X X
+ */
+
+#define UNALIGNED_USER_EXCEPTION
+
+#if XCHAL_HAVE_BE
+
+#define HWORD_START 16
+#define INSN_OP0 28
+#define INSN_T 24
+#define INSN_OP1 16
+
+.macro __src_b r, w0, w1; src \r, \w0, \w1; .endm
+.macro __ssa8 r; ssa8b \r; .endm
+.macro __ssa8r r; ssa8l \r; .endm
+.macro __sh r, s; srl \r, \s; .endm
+.macro __sl r, s; sll \r, \s; .endm
+.macro __exth r, s; extui \r, \s, 0, 16; .endm
+.macro __extl r, s; slli \r, \s, 16; .endm
+
+#else
+
+#define HWORD_START 0
+#define INSN_OP0 0
+#define INSN_T 4
+#define INSN_OP1 12
+
+.macro __src_b r, w0, w1; src \r, \w1, \w0; .endm
+.macro __ssa8 r; ssa8l \r; .endm
+.macro __ssa8r r; ssa8b \r; .endm
+.macro __sh r, s; sll \r, \s; .endm
+.macro __sl r, s; srl \r, \s; .endm
+.macro __exth r, s; slli \r, \s, 16; .endm
+.macro __extl r, s; extui \r, \s, 0, 16; .endm
+
+#endif
+
+/*
+ * xxxx xxxx = imm8 field
+ * yyyy = imm4 field
+ * ssss = s field
+ * tttt = t field
+ *
+ * 16 0
+ * -------------------
+ * L32I.N yyyy ssss tttt 1000
+ * S32I.N yyyy ssss tttt 1001
+ *
+ * 23 0
+ * -----------------------------
+ * res 0000 0010
+ * L16UI xxxx xxxx 0001 ssss tttt 0010
+ * L32I xxxx xxxx 0010 ssss tttt 0010
+ * XXX 0011 ssss tttt 0010
+ * XXX 0100 ssss tttt 0010
+ * S16I xxxx xxxx 0101 ssss tttt 0010
+ * S32I xxxx xxxx 0110 ssss tttt 0010
+ * XXX 0111 ssss tttt 0010
+ * XXX 1000 ssss tttt 0010
+ * L16SI xxxx xxxx 1001 ssss tttt 0010
+ * XXX 1010 0010
+ * **L32AI xxxx xxxx 1011 ssss tttt 0010 unsupported
+ * XXX 1100 0010
+ * XXX 1101 0010
+ * XXX 1110 0010
+ * **S32RI xxxx xxxx 1111 ssss tttt 0010 unsupported
+ * -----------------------------
+ * ^ ^ ^
+ * sub-opcode (NIBBLE_R) -+ | |
+ * t field (NIBBLE_T) -----------+ |
+ * major opcode (NIBBLE_OP0) --------------+
+ */
+
+#define OP0_L32I_N 0x8 /* load immediate narrow */
+#define OP0_S32I_N 0x9 /* store immediate narrow */
+#define OP1_SI_MASK 0x4 /* OP1 bit set for stores */
+#define OP1_SI_BIT 2 /* OP1 bit number for stores */
+
+#define OP1_L32I 0x2
+#define OP1_L16UI 0x1
+#define OP1_L16SI 0x9
+#define OP1_L32AI 0xb
+
+#define OP1_S32I 0x6
+#define OP1_S16I 0x5
+#define OP1_S32RI 0xf
+
+/*
+ * Entry condition:
+ *
+ * a0: trashed, original value saved on stack (PT_AREG0)
+ * a1: a1
+ * a2: new stack pointer, original in DEPC
+ * a3: dispatch table
+ * depc: a2, original value saved on stack (PT_DEPC)
+ * excsave_1: a3
+ *
+ * PT_DEPC >= VALID_DOUBLE_EXCEPTION_ADDRESS: double exception, DEPC
+ * < VALID_DOUBLE_EXCEPTION_ADDRESS: regular exception
+ */
+
+
+ENTRY(fast_unaligned)
+
+ /* Note: We don't expect the address to be aligned on a word
+ * boundary. After all, the processor generated that exception
+ * and it would be a hardware fault.
+ */
+
+ /* Save some working register */
+
+ s32i a4, a2, PT_AREG4
+ s32i a5, a2, PT_AREG5
+ s32i a6, a2, PT_AREG6
+ s32i a7, a2, PT_AREG7
+ s32i a8, a2, PT_AREG8
+
+ rsr a0, DEPC
+ xsr a3, EXCSAVE_1
+ s32i a0, a2, PT_AREG2
+ s32i a3, a2, PT_AREG3
+
+ /* Keep value of SAR in a0 */
+
+ rsr a0, SAR
+ rsr a8, EXCVADDR # load unaligned memory address
+
+ /* Now, identify one of the following load/store instructions.
+ *
+ * The only possible danger of a double exception on the
+ * following l32i instructions is kernel code in vmalloc
+ * memory. The processor was just executing at the EPC_1
+ * address, and indeed, already fetched the instruction. That
+ * guarantees a TLB mapping, which hasn't been replaced by
+ * this unaligned exception handler that uses only static TLB
+ * mappings. However, high-level interrupt handlers might
+ * modify TLB entries, so for the generic case, we register a
+ * TABLE_FIXUP handler here, too.
+ */
+
+ /* a3...a6 saved on stack, a2 = SP */
+
+ /* Extract the instruction that caused the unaligned access. */
+
+ rsr a7, EPC_1 # load exception address
+ movi a3, ~3
+ and a3, a3, a7 # mask lower bits
+
+ l32i a4, a3, 0 # load 2 words
+ l32i a5, a3, 4
+
+ __ssa8 a7
+ __src_b a4, a4, a5 # a4 has the instruction
+
+ /* Analyze the instruction (load or store?). */
+
+ extui a5, a4, INSN_OP0, 4 # get insn.op0 nibble
+
+#if XCHAL_HAVE_NARROW
+ _beqi a5, OP0_L32I_N, .Lload # L32I.N, jump
+ addi a6, a5, -OP0_S32I_N
+ _beqz a6, .Lstore # S32I.N, do a store
+#endif
+ /* 'store indicator bit' not set, jump */
+ _bbci.l a4, OP1_SI_BIT + INSN_OP1, .Lload
+
+ /* Store: Jump to table entry to get the value in the source register.*/
+
+.Lstore:movi a5, .Lstore_table # table
+ extui a6, a4, INSN_T, 4 # get source register
+ addx8 a5, a6, a5
+ jx a5 # jump into table
+
+ /* Invalid instruction, CRITICAL! */
+.Linvalid_instruction_load:
+ j .Linvalid_instruction
+
+ /* Load: Load memory address. */
+
+.Lload: movi a3, ~3
+ and a3, a3, a8 # align memory address
+
+ __ssa8 a8
+#ifdef UNALIGNED_USER_EXCEPTION
+ addi a3, a3, 8
+ l32e a5, a3, -8
+ l32e a6, a3, -4
+#else
+ l32i a5, a3, 0
+ l32i a6, a3, 4
+#endif
+ __src_b a3, a5, a6 # a3 has the data word
+
+#if XCHAL_HAVE_NARROW
+ addi a7, a7, 2 # increment PC (assume 16-bit insn)
+
+ extui a5, a4, INSN_OP0, 4
+ _beqi a5, OP0_L32I_N, 1f # l32i.n: jump
+
+ addi a7, a7, 1
+#else
+ addi a7, a7, 3
+#endif
+
+ extui a5, a4, INSN_OP1, 4
+ _beqi a5, OP1_L32I, 1f # l32i: jump
+
+ extui a3, a3, 0, 16 # extract lower 16 bits
+ _beqi a5, OP1_L16UI, 1f
+ addi a5, a5, -OP1_L16SI
+ _bnez a5, .Linvalid_instruction_load
+
+ /* sign extend value */
+
+ slli a3, a3, 16
+ srai a3, a3, 16
+
+ /* Set target register. */
+
+1:
+
+#if XCHAL_HAVE_LOOP
+ rsr a3, LEND # check if we reached LEND
+ bne a7, a3, 1f
+ rsr a3, LCOUNT # and LCOUNT != 0
+ beqz a3, 1f
+ addi a3, a3, -1 # decrement LCOUNT and set
+ rsr a7, LBEG # set PC to LBEGIN
+ wsr a3, LCOUNT
+#endif
+
+1: wsr a7, EPC_1 # skip load instruction
+ extui a4, a4, INSN_T, 4 # extract target register
+ movi a5, .Lload_table
+ addx8 a4, a4, a5
+ jx a4 # jump to entry for target register
+
+ .align 8
+.Lload_table:
+ s32i a3, a2, PT_AREG0; _j .Lexit; .align 8
+ mov a1, a3; _j .Lexit; .align 8 # fishy??
+ s32i a3, a2, PT_AREG2; _j .Lexit; .align 8
+ s32i a3, a2, PT_AREG3; _j .Lexit; .align 8
+ s32i a3, a2, PT_AREG4; _j .Lexit; .align 8
+ s32i a3, a2, PT_AREG5; _j .Lexit; .align 8
+ s32i a3, a2, PT_AREG6; _j .Lexit; .align 8
+ s32i a3, a2, PT_AREG7; _j .Lexit; .align 8
+ s32i a3, a2, PT_AREG8; _j .Lexit; .align 8
+ mov a9, a3 ; _j .Lexit; .align 8
+ mov a10, a3 ; _j .Lexit; .align 8
+ mov a11, a3 ; _j .Lexit; .align 8
+ mov a12, a3 ; _j .Lexit; .align 8
+ mov a13, a3 ; _j .Lexit; .align 8
+ mov a14, a3 ; _j .Lexit; .align 8
+ mov a15, a3 ; _j .Lexit; .align 8
+
+.Lstore_table:
+ l32i a3, a2, PT_AREG0; _j 1f; .align 8
+ mov a3, a1; _j 1f; .align 8 # fishy??
+ l32i a3, a2, PT_AREG2; _j 1f; .align 8
+ l32i a3, a2, PT_AREG3; _j 1f; .align 8
+ l32i a3, a2, PT_AREG4; _j 1f; .align 8
+ l32i a3, a2, PT_AREG5; _j 1f; .align 8
+ l32i a3, a2, PT_AREG6; _j 1f; .align 8
+ l32i a3, a2, PT_AREG7; _j 1f; .align 8
+ l32i a3, a2, PT_AREG8; _j 1f; .align 8
+ mov a3, a9 ; _j 1f; .align 8
+ mov a3, a10 ; _j 1f; .align 8
+ mov a3, a11 ; _j 1f; .align 8
+ mov a3, a12 ; _j 1f; .align 8
+ mov a3, a13 ; _j 1f; .align 8
+ mov a3, a14 ; _j 1f; .align 8
+ mov a3, a15 ; _j 1f; .align 8
+
+1: # a7: instruction pointer, a4: instruction, a3: value
+
+ movi a6, 0 # mask: ffffffff:00000000
+
+#if XCHAL_HAVE_NARROW
+ addi a7, a7, 2 # incr. PC,assume 16-bit instruction
+
+ extui a5, a4, INSN_OP0, 4 # extract OP0
+ addi a5, a5, -OP0_S32I_N
+ _beqz a5, 1f # s32i.n: jump
+
+ addi a7, a7, 1 # increment PC, 32-bit instruction
+#else
+ addi a7, a7, 3 # increment PC, 32-bit instruction
+#endif
+
+ extui a5, a4, INSN_OP1, 4 # extract OP1
+ _beqi a5, OP1_S32I, 1f # jump if 32 bit store
+ _bnei a5, OP1_S16I, .Linvalid_instruction_store
+
+ movi a5, -1
+ __extl a3, a3 # get 16-bit value
+ __exth a6, a5 # get 16-bit mask ffffffff:ffff0000
+
+ /* Get memory address */
+
+1:
+#if XCHAL_HAVE_LOOP
+ rsr a3, LEND # check if we reached LEND
+ bne a7, a3, 1f
+ rsr a3, LCOUNT # and LCOUNT != 0
+ beqz a3, 1f
+ addi a3, a3, -1 # decrement LCOUNT and set
+ rsr a7, LBEG # set PC to LBEGIN
+ wsr a3, LCOUNT
+#endif
+
+1: wsr a7, EPC_1 # skip store instruction
+ movi a4, ~3
+ and a4, a4, a8 # align memory address
+
+ /* Insert value into memory */
+
+ movi a5, -1 # mask: ffffffff:XXXX0000
+#ifdef UNALIGNED_USER_EXCEPTION
+ addi a4, a4, 8
+#endif
+
+ __ssa8r a8
+ __src_b a7, a5, a6 # lo-mask F..F0..0 (BE) 0..0F..F (LE)
+ __src_b a6, a6, a5 # hi-mask 0..0F..F (BE) F..F0..0 (LE)
+#ifdef UNALIGNED_USER_EXCEPTION
+ l32e a5, a4, -8
+#else
+ l32i a5, a4, 0 # load lower address word
+#endif
+ and a5, a5, a7 # mask
+ __sh a7, a3 # shift value
+ or a5, a5, a7 # or with original value
+#ifdef UNALIGNED_USER_EXCEPTION
+ s32e a5, a4, -8
+ l32e a7, a4, -4
+#else
+ s32i a5, a4, 0 # store
+ l32i a7, a4, 4 # same for upper address word
+#endif
+ __sl a5, a3
+ and a6, a7, a6
+ or a6, a6, a5
+#ifdef UNALIGNED_USER_EXCEPTION
+ s32e a6, a4, -4
+#else
+ s32i a6, a4, 4
+#endif
+
+ /* Done. restore stack and return */
+
+.Lexit:
+ movi a4, 0
+ rsr a3, EXCSAVE_1
+ s32i a4, a3, EXC_TABLE_FIXUP
+
+ /* Restore working register */
+
+ l32i a7, a2, PT_AREG7
+ l32i a6, a2, PT_AREG6
+ l32i a5, a2, PT_AREG5
+ l32i a4, a2, PT_AREG4
+ l32i a3, a2, PT_AREG3
+
+ /* restore SAR and return */
+
+ wsr a0, SAR
+ l32i a0, a2, PT_AREG0
+ l32i a2, a2, PT_AREG2
+ rfe
+
+ /* We cannot handle this exception. */
+
+ .extern _kernel_exception
+.Linvalid_instruction_store:
+.Linvalid_instruction:
+
+ /* Restore a4...a8 and SAR, set SP, and jump to default exception. */
+
+ l32i a8, a2, PT_AREG8
+ l32i a7, a2, PT_AREG7
+ l32i a6, a2, PT_AREG6
+ l32i a5, a2, PT_AREG5
+ l32i a4, a2, PT_AREG4
+ wsr a0, SAR
+ mov a1, a2
+
+ rsr a0, PS
+ bbsi.l a2, PS_UM_SHIFT, 1f # jump if user mode
+
+ movi a0, _kernel_exception
+ jx a0
+
+1: movi a0, _user_exception
+ jx a0
+
+
+#endif /* XCHAL_UNALIGNED_LOAD_EXCEPTION || XCHAL_UNALIGNED_STORE_EXCEPTION */
+
--- /dev/null
+/*
+ * arch/xtensa/kernel/asm-offsets.c
+ *
+ * Generates definitions from c-type structures used by assembly sources.
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2005 Tensilica Inc.
+ *
+ * Chris Zankel <chris@zankel.net>
+ */
+
+#include <asm/processor.h>
+
+#include <linux/types.h>
+#include <linux/sched.h>
+#include <linux/stddef.h>
+#include <linux/thread_info.h>
+#include <linux/ptrace.h>
+#include <asm/ptrace.h>
+#include <asm/processor.h>
+#include <asm/uaccess.h>
+
+#define DEFINE(sym, val) asm volatile("\n->" #sym " %0 " #val : : "i" (val))
+#define BLANK() asm volatile("\n->" : : )
+
+int main(void)
+{
+ /* struct pt_regs */
+ DEFINE(PT_PC, offsetof (struct pt_regs, pc));
+ DEFINE(PT_PS, offsetof (struct pt_regs, ps));
+ DEFINE(PT_DEPC, offsetof (struct pt_regs, depc));
+ DEFINE(PT_EXCCAUSE, offsetof (struct pt_regs, exccause));
+ DEFINE(PT_EXCVADDR, offsetof (struct pt_regs, excvaddr));
+ DEFINE(PT_DEBUGCAUSE, offsetof (struct pt_regs, debugcause));
+ DEFINE(PT_WMASK, offsetof (struct pt_regs, wmask));
+ DEFINE(PT_LBEG, offsetof (struct pt_regs, lbeg));
+ DEFINE(PT_LEND, offsetof (struct pt_regs, lend));
+ DEFINE(PT_LCOUNT, offsetof (struct pt_regs, lcount));
+ DEFINE(PT_SAR, offsetof (struct pt_regs, sar));
+ DEFINE(PT_SYSCALL, offsetof (struct pt_regs, syscall));
+ DEFINE(PT_AREG, offsetof (struct pt_regs, areg[0]));
+ DEFINE(PT_AREG0, offsetof (struct pt_regs, areg[0]));
+ DEFINE(PT_AREG1, offsetof (struct pt_regs, areg[1]));
+ DEFINE(PT_AREG2, offsetof (struct pt_regs, areg[2]));
+ DEFINE(PT_AREG3, offsetof (struct pt_regs, areg[3]));
+ DEFINE(PT_AREG4, offsetof (struct pt_regs, areg[4]));
+ DEFINE(PT_AREG5, offsetof (struct pt_regs, areg[5]));
+ DEFINE(PT_AREG6, offsetof (struct pt_regs, areg[6]));
+ DEFINE(PT_AREG7, offsetof (struct pt_regs, areg[7]));
+ DEFINE(PT_AREG8, offsetof (struct pt_regs, areg[8]));
+ DEFINE(PT_AREG9, offsetof (struct pt_regs, areg[9]));
+ DEFINE(PT_AREG10, offsetof (struct pt_regs, areg[10]));
+ DEFINE(PT_AREG11, offsetof (struct pt_regs, areg[11]));
+ DEFINE(PT_AREG12, offsetof (struct pt_regs, areg[12]));
+ DEFINE(PT_AREG13, offsetof (struct pt_regs, areg[13]));
+ DEFINE(PT_AREG14, offsetof (struct pt_regs, areg[14]));
+ DEFINE(PT_AREG15, offsetof (struct pt_regs, areg[15]));
+ DEFINE(PT_WINDOWBASE, offsetof (struct pt_regs, windowbase));
+ DEFINE(PT_WINDOWSTART, offsetof(struct pt_regs, windowstart));
+ DEFINE(PT_SIZE, sizeof(struct pt_regs));
+ DEFINE(PT_AREG_END, offsetof (struct pt_regs, areg[XCHAL_NUM_AREGS]));
+ DEFINE(PT_USER_SIZE, offsetof(struct pt_regs, areg[XCHAL_NUM_AREGS]));
+ BLANK();
+
+ /* struct task_struct */
+ DEFINE(TASK_PTRACE, offsetof (struct task_struct, ptrace));
+ DEFINE(TASK_MM, offsetof (struct task_struct, mm));
+ DEFINE(TASK_ACTIVE_MM, offsetof (struct task_struct, active_mm));
+ DEFINE(TASK_PID, offsetof (struct task_struct, pid));
+ DEFINE(TASK_THREAD, offsetof (struct task_struct, thread));
+ DEFINE(TASK_THREAD_INFO, offsetof (struct task_struct, thread_info));
+ DEFINE(TASK_STRUCT_SIZE, sizeof (struct task_struct));
+ BLANK();
+
+ /* struct thread_info (offset from start_struct) */
+ DEFINE(THREAD_RA, offsetof (struct task_struct, thread.ra));
+ DEFINE(THREAD_SP, offsetof (struct task_struct, thread.sp));
+ DEFINE(THREAD_CP_SAVE, offsetof (struct task_struct, thread.cp_save));
+ DEFINE(THREAD_CURRENT_DS, offsetof (struct task_struct, thread.current_ds));
+ BLANK();
+
+ /* struct mm_struct */
+ DEFINE(MM_USERS, offsetof(struct mm_struct, mm_users));
+ DEFINE(MM_PGD, offsetof (struct mm_struct, pgd));
+ DEFINE(MM_CONTEXT, offsetof (struct mm_struct, context));
+ BLANK();
+ DEFINE(PT_SINGLESTEP_BIT, PT_SINGLESTEP_BIT);
+ return 0;
+}
+
+
--- /dev/null
+/*
+ * arch/xtensa/kernel/coprocessor.S
+ *
+ * Xtensa processor configuration-specific table of coprocessor and
+ * other custom register layout information.
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2003 - 2005 Tensilica Inc.
+ *
+ * Marc Gauthier <marc@tensilica.com> <marc@alumni.uwaterloo.ca>
+ */
+
+/*
+ * This module contains a table that describes the layout of the various
+ * custom registers and states associated with each coprocessor, as well
+ * as those not associated with any coprocessor ("extra state").
+ * This table is included with core dumps and is available via the ptrace
+ * interface, allowing the layout of such register/state information to
+ * be modified in the kernel without affecting the debugger. Each
+ * register or state is identified using a 32-bit "libdb target number"
+ * assigned when the Xtensa processor is generated.
+ */
+
+#include <linux/config.h>
+#include <linux/linkage.h>
+#include <asm/processor.h>
+
+#if XCHAL_HAVE_CP
+
+#define CP_LAST ((XCHAL_CP_MAX - 1) * COPROCESSOR_INFO_SIZE)
+
+ENTRY(release_coprocessors)
+
+ entry a1, 16
+ # a2: task
+ movi a3, 1 << XCHAL_CP_MAX # a3: coprocessor-bit
+ movi a4, coprocessor_info+CP_LAST # a4: owner-table
+ # a5: tmp
+ movi a6, 0 # a6: 0
+ rsil a7, LOCKLEVEL # a7: PS
+
+1: /* Check if task is coprocessor owner of coprocessor[i]. */
+
+ l32i a5, a4, COPROCESSOR_INFO_OWNER
+ srli a3, a3, 1
+ beqz a3, 1f
+ addi a4, a4, -8
+ beq a2, a5, 1b
+
+ /* Found an entry: Clear entry CPENABLE bit to disable CP. */
+
+ rsr a5, CPENABLE
+ s32i a6, a4, COPROCESSOR_INFO_OWNER
+ xor a5, a3, a5
+ wsr a5, CPENABLE
+
+ bnez a3, 1b
+
+1: wsr a7, PS
+ rsync
+ retw
+
+
+ENTRY(disable_coprocessor)
+ entry sp, 16
+ rsil a7, LOCKLEVEL
+ rsr a3, CPENABLE
+ movi a4, 1
+ ssl a2
+ sll a4, a4
+ and a4, a3, a4
+ xor a3, a3, a4
+ wsr a3, CPENABLE
+ wsr a7, PS
+ rsync
+ retw
+
+ENTRY(enable_coprocessor)
+ entry sp, 16
+ rsil a7, LOCKLEVEL
+ rsr a3, CPENABLE
+ movi a4, 1
+ ssl a2
+ sll a4, a4
+ or a3, a3, a4
+ wsr a3, CPENABLE
+ wsr a7, PS
+ rsync
+ retw
+
+#endif
+
+ENTRY(save_coprocessor_extra)
+ entry sp, 16
+ xchal_extra_store_funcbody
+ retw
+
+ENTRY(restore_coprocessor_extra)
+ entry sp, 16
+ xchal_extra_load_funcbody
+ retw
+
+ENTRY(save_coprocessor_registers)
+ entry sp, 16
+ xchal_cpi_store_funcbody
+ retw
+
+ENTRY(restore_coprocessor_registers)
+ entry sp, 16
+ xchal_cpi_load_funcbody
+ retw
+
+
+/*
+ * The Xtensa compile-time HAL (core.h) XCHAL_*_SA_CONTENTS_LIBDB macros
+ * describe the contents of coprocessor & extra save areas in terms of
+ * undefined CONTENTS_LIBDB_{SREG,UREG,REGF} macros. We define these
+ * latter macros here; they expand into a table of the format we want.
+ * The general format is:
+ *
+ * CONTENTS_LIBDB_SREG(libdbnum, offset, size, align, rsv1, name, sregnum,
+ * bitmask, rsv2, rsv3)
+ * CONTENTS_LIBDB_UREG(libdbnum, offset, size, align, rsv1, name, uregnum,
+ * bitmask, rsv2, rsv3)
+ * CONTENTS_LIBDB_REGF(libdbnum, offset, size, align, rsv1, name, index,
+ * numentries, contentsize, regname_base,
+ * regfile_name, rsv2, rsv3)
+ *
+ * For this table, we only care about the <libdbnum>, <offset> and <size>
+ * fields.
+ */
+
+/* Map all XCHAL CONTENTS macros to the reg_entry asm macro defined below: */
+
+#define CONTENTS_LIBDB_SREG(libdbnum,offset,size,align,rsv1,name,sregnum, \
+ bitmask, rsv2, rsv3) \
+ reg_entry libdbnum, offset, size ;
+#define CONTENTS_LIBDB_UREG(libdbnum,offset,size,align,rsv1,name,uregnum, \
+ bitmask, rsv2, rsv3) \
+ reg_entry libdbnum, offset, size ;
+#define CONTENTS_LIBDB_REGF(libdbnum, offset, size, align, rsv1, name, index, \
+ numentries, contentsize, regname_base, \
+ regfile_name, rsv2, rsv3) \
+ reg_entry libdbnum, offset, size ;
+
+/* A single table entry: */
+ .macro reg_entry libdbnum, offset, size
+ .ifne (__last_offset-(__last_group_offset+\offset))
+ /* padding entry */
+ .word (0xFC000000+__last_offset-(__last_group_offset+\offset))
+ .endif
+ .word \libdbnum /* actual entry */
+ .set __last_offset, __last_group_offset+\offset+\size
+ .endm /* reg_entry */
+
+
+/* Table entry that marks the beginning of a group (coprocessor or "extra"): */
+ .macro reg_group cpnum, num_entries, align
+ .set __last_group_offset, (__last_offset + \align- 1) & -\align
+ .ifne \num_entries
+ .word 0xFD000000+(\cpnum<<16)+\num_entries
+ .endif
+ .endm /* reg_group */
+
+/*
+ * Register info tables.
+ */
+
+ .section .rodata, "a"
+ .globl _xtensa_reginfo_tables
+ .globl _xtensa_reginfo_table_size
+ .align 4
+_xtensa_reginfo_table_size:
+ .word _xtensa_reginfo_table_end - _xtensa_reginfo_tables
+
+_xtensa_reginfo_tables:
+ .set __last_offset, 0
+ reg_group 0xFF, XCHAL_EXTRA_SA_CONTENTS_LIBDB_NUM, XCHAL_EXTRA_SA_ALIGN
+ XCHAL_EXTRA_SA_CONTENTS_LIBDB
+ reg_group 0, XCHAL_CP0_SA_CONTENTS_LIBDB_NUM, XCHAL_CP0_SA_ALIGN
+ XCHAL_CP0_SA_CONTENTS_LIBDB
+ reg_group 1, XCHAL_CP1_SA_CONTENTS_LIBDB_NUM, XCHAL_CP1_SA_ALIGN
+ XCHAL_CP1_SA_CONTENTS_LIBDB
+ reg_group 2, XCHAL_CP2_SA_CONTENTS_LIBDB_NUM, XCHAL_CP2_SA_ALIGN
+ XCHAL_CP2_SA_CONTENTS_LIBDB
+ reg_group 3, XCHAL_CP3_SA_CONTENTS_LIBDB_NUM, XCHAL_CP3_SA_ALIGN
+ XCHAL_CP3_SA_CONTENTS_LIBDB
+ reg_group 4, XCHAL_CP4_SA_CONTENTS_LIBDB_NUM, XCHAL_CP4_SA_ALIGN
+ XCHAL_CP4_SA_CONTENTS_LIBDB
+ reg_group 5, XCHAL_CP5_SA_CONTENTS_LIBDB_NUM, XCHAL_CP5_SA_ALIGN
+ XCHAL_CP5_SA_CONTENTS_LIBDB
+ reg_group 6, XCHAL_CP6_SA_CONTENTS_LIBDB_NUM, XCHAL_CP6_SA_ALIGN
+ XCHAL_CP6_SA_CONTENTS_LIBDB
+ reg_group 7, XCHAL_CP7_SA_CONTENTS_LIBDB_NUM, XCHAL_CP7_SA_ALIGN
+ XCHAL_CP7_SA_CONTENTS_LIBDB
+ .word 0xFC000000 /* invalid register number,marks end of table*/
+_xtensa_reginfo_table_end:
+
--- /dev/null
+/*
+ * arch/xtensa/kernel/entry.S
+ *
+ * Low-level exception handling
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2004-2005 by Tensilica Inc.
+ *
+ * Chris Zankel <chris@zankel.net>
+ *
+ */
+
+#include <linux/linkage.h>
+#include <asm/offsets.h>
+#include <asm/processor.h>
+#include <asm/thread_info.h>
+#include <asm/uaccess.h>
+#include <asm/unistd.h>
+#include <asm/ptrace.h>
+#include <asm/current.h>
+#include <asm/pgtable.h>
+#include <asm/page.h>
+#include <asm/signal.h>
+#include <xtensa/coreasm.h>
+
+/* Unimplemented features. */
+
+#undef SIGNAL_HANDLING_IN_DOUBLE_EXCEPTION
+#undef KERNEL_STACK_OVERFLOW_CHECK
+#undef PREEMPTIBLE_KERNEL
+#undef ALLOCA_EXCEPTION_IN_IRAM
+
+/* Not well tested.
+ *
+ * - fast_coprocessor
+ */
+
+/*
+ * Macro to find first bit set in WINDOWBASE from the left + 1
+ *
+ * 100....0 -> 1
+ * 010....0 -> 2
+ * 000....1 -> WSBITS
+ */
+
+ .macro ffs_ws bit mask
+
+#if XCHAL_HAVE_NSA
+ nsau \bit, \mask # 32-WSBITS ... 31 (32 iff 0)
+ addi \bit, \bit, WSBITS - 32 + 1 # uppest bit set -> return 1
+#else
+ movi \bit, WSBITS
+#if WSBITS > 16
+ _bltui \mask, 0x10000, 99f
+ addi \bit, \bit, -16
+ extui \mask, \mask, 16, 16
+#endif
+#if WSBITS > 8
+99: _bltui \mask, 0x100, 99f
+ addi \bit, \bit, -8
+ srli \mask, \mask, 8
+#endif
+99: _bltui \mask, 0x10, 99f
+ addi \bit, \bit, -4
+ srli \mask, \mask, 4
+99: _bltui \mask, 0x4, 99f
+ addi \bit, \bit, -2
+ srli \mask, \mask, 2
+99: _bltui \mask, 0x2, 99f
+ addi \bit, \bit, -1
+99:
+
+#endif
+ .endm
+
+/* ----------------- DEFAULT FIRST LEVEL EXCEPTION HANDLERS ----------------- */
+
+/*
+ * First-level exception handler for user exceptions.
+ * Save some special registers, extra states and all registers in the AR
+ * register file that were in use in the user task, and jump to the common
+ * exception code.
+ * We save SAR (used to calculate WMASK), and WB and WS (we don't have to
+ * save them for kernel exceptions).
+ *
+ * Entry condition for user_exception:
+ *
+ * a0: trashed, original value saved on stack (PT_AREG0)
+ * a1: a1
+ * a2: new stack pointer, original value in depc
+ * a3: dispatch table
+ * depc: a2, original value saved on stack (PT_DEPC)
+ * excsave1: a3
+ *
+ * PT_DEPC >= VALID_DOUBLE_EXCEPTION_ADDRESS: double exception, DEPC
+ * < VALID_DOUBLE_EXCEPTION_ADDRESS: regular exception
+ *
+ * Entry condition for _user_exception:
+ *
+ * a0-a3 and depc have been saved to PT_AREG0...PT_AREG3 and PT_DEPC
+ * excsave has been restored, and
+ * stack pointer (a1) has been set.
+ *
+ * Note: _user_exception might be at an odd adress. Don't use call0..call12
+ */
+
+ENTRY(user_exception)
+
+ /* Save a2, a3, and depc, restore excsave_1 and set SP. */
+
+ xsr a3, EXCSAVE_1
+ rsr a0, DEPC
+ s32i a1, a2, PT_AREG1
+ s32i a0, a2, PT_AREG2
+ s32i a3, a2, PT_AREG3
+ mov a1, a2
+
+ .globl _user_exception
+_user_exception:
+
+ /* Save SAR and turn off single stepping */
+
+ movi a2, 0
+ rsr a3, SAR
+ wsr a2, ICOUNTLEVEL
+ s32i a3, a1, PT_SAR
+
+ /* Rotate ws so that the current windowbase is at bit0. */
+ /* Assume ws = xxwww1yyyy. Rotate ws right, so that a2 = yyyyxxwww1 */
+
+ rsr a2, WINDOWBASE
+ rsr a3, WINDOWSTART
+ ssr a2
+ s32i a2, a1, PT_WINDOWBASE
+ s32i a3, a1, PT_WINDOWSTART
+ slli a2, a3, 32-WSBITS
+ src a2, a3, a2
+ srli a2, a2, 32-WSBITS
+ s32i a2, a1, PT_WMASK # needed for restoring registers
+
+ /* Save only live registers. */
+
+ _bbsi.l a2, 1, 1f
+ s32i a4, a1, PT_AREG4
+ s32i a5, a1, PT_AREG5
+ s32i a6, a1, PT_AREG6
+ s32i a7, a1, PT_AREG7
+ _bbsi.l a2, 2, 1f
+ s32i a8, a1, PT_AREG8
+ s32i a9, a1, PT_AREG9
+ s32i a10, a1, PT_AREG10
+ s32i a11, a1, PT_AREG11
+ _bbsi.l a2, 3, 1f
+ s32i a12, a1, PT_AREG12
+ s32i a13, a1, PT_AREG13
+ s32i a14, a1, PT_AREG14
+ s32i a15, a1, PT_AREG15
+ _bnei a2, 1, 1f # only one valid frame?
+
+ /* Only one valid frame, skip saving regs. */
+
+ j 2f
+
+ /* Save the remaining registers.
+ * We have to save all registers up to the first '1' from
+ * the right, except the current frame (bit 0).
+ * Assume a2 is: 001001000110001
+ * All regiser frames starting from the top fiel to the marked '1'
+ * must be saved.
+ */
+
+1: addi a3, a2, -1 # eliminate '1' in bit 0: yyyyxxww0
+ neg a3, a3 # yyyyxxww0 -> YYYYXXWW1+1
+ and a3, a3, a2 # max. only one bit is set
+
+ /* Find number of frames to save */
+
+ ffs_ws a0, a3 # number of frames to the '1' from left
+
+ /* Store information into WMASK:
+ * bits 0..3: xxx1 masked lower 4 bits of the rotated windowstart,
+ * bits 4...: number of valid 4-register frames
+ */
+
+ slli a3, a0, 4 # number of frames to save in bits 8..4
+ extui a2, a2, 0, 4 # mask for the first 16 registers
+ or a2, a3, a2
+ s32i a2, a1, PT_WMASK # needed when we restore the reg-file
+
+ /* Save 4 registers at a time */
+
+1: rotw -1
+ s32i a0, a5, PT_AREG_END - 16
+ s32i a1, a5, PT_AREG_END - 12
+ s32i a2, a5, PT_AREG_END - 8
+ s32i a3, a5, PT_AREG_END - 4
+ addi a0, a4, -1
+ addi a1, a5, -16
+ _bnez a0, 1b
+
+ /* WINDOWBASE still in SAR! */
+
+ rsr a2, SAR # original WINDOWBASE
+ movi a3, 1
+ ssl a2
+ sll a3, a3
+ wsr a3, WINDOWSTART # set corresponding WINDOWSTART bit
+ wsr a2, WINDOWBASE # and WINDOWSTART
+ rsync
+
+ /* We are back to the original stack pointer (a1) */
+
+2:
+#if XCHAL_EXTRA_SA_SIZE
+
+ /* For user exceptions, save the extra state into the user's TCB.
+ * Note: We must assume that xchal_extra_store_funcbody destroys a2..a15
+ */
+
+ GET_CURRENT(a2,a1)
+ addi a2, a2, THREAD_CP_SAVE
+ xchal_extra_store_funcbody
+#endif
+
+ /* Now, jump to the common exception handler. */
+
+ j common_exception
+
+
+/*
+ * First-level exit handler for kernel exceptions
+ * Save special registers and the live window frame.
+ * Note: Even though we changes the stack pointer, we don't have to do a
+ * MOVSP here, as we do that when we return from the exception.
+ * (See comment in the kernel exception exit code)
+ *
+ * Entry condition for kernel_exception:
+ *
+ * a0: trashed, original value saved on stack (PT_AREG0)
+ * a1: a1
+ * a2: new stack pointer, original in DEPC
+ * a3: dispatch table
+ * depc: a2, original value saved on stack (PT_DEPC)
+ * excsave_1: a3
+ *
+ * PT_DEPC >= VALID_DOUBLE_EXCEPTION_ADDRESS: double exception, DEPC
+ * < VALID_DOUBLE_EXCEPTION_ADDRESS: regular exception
+ *
+ * Entry condition for _kernel_exception:
+ *
+ * a0-a3 and depc have been saved to PT_AREG0...PT_AREG3 and PT_DEPC
+ * excsave has been restored, and
+ * stack pointer (a1) has been set.
+ *
+ * Note: _kernel_exception might be at an odd adress. Don't use call0..call12
+ */
+
+ENTRY(kernel_exception)
+
+ /* Save a0, a2, a3, DEPC and set SP. */
+
+ xsr a3, EXCSAVE_1 # restore a3, excsave_1
+ rsr a0, DEPC # get a2
+ s32i a1, a2, PT_AREG1
+ s32i a0, a2, PT_AREG2
+ s32i a3, a2, PT_AREG3
+ mov a1, a2
+
+ .globl _kernel_exception
+_kernel_exception:
+
+ /* Save SAR and turn off single stepping */
+
+ movi a2, 0
+ rsr a3, SAR
+ wsr a2, ICOUNTLEVEL
+ s32i a3, a1, PT_SAR
+
+ /* Rotate ws so that the current windowbase is at bit0. */
+ /* Assume ws = xxwww1yyyy. Rotate ws right, so that a2 = yyyyxxwww1 */
+
+ rsr a2, WINDOWBASE # don't need to save these, we only
+ rsr a3, WINDOWSTART # need shifted windowstart: windowmask
+ ssr a2
+ slli a2, a3, 32-WSBITS
+ src a2, a3, a2
+ srli a2, a2, 32-WSBITS
+ s32i a2, a1, PT_WMASK # needed for kernel_exception_exit
+
+ /* Save only the live window-frame */
+
+ _bbsi.l a2, 1, 1f
+ s32i a4, a1, PT_AREG4
+ s32i a5, a1, PT_AREG5
+ s32i a6, a1, PT_AREG6
+ s32i a7, a1, PT_AREG7
+ _bbsi.l a2, 2, 1f
+ s32i a8, a1, PT_AREG8
+ s32i a9, a1, PT_AREG9
+ s32i a10, a1, PT_AREG10
+ s32i a11, a1, PT_AREG11
+ _bbsi.l a2, 3, 1f
+ s32i a12, a1, PT_AREG12
+ s32i a13, a1, PT_AREG13
+ s32i a14, a1, PT_AREG14
+ s32i a15, a1, PT_AREG15
+
+1:
+
+#ifdef KERNEL_STACK_OVERFLOW_CHECK
+
+ /* Stack overflow check, for debugging */
+ extui a2, a1, TASK_SIZE_BITS,XX
+ movi a3, SIZE??
+ _bge a2, a3, out_of_stack_panic
+
+#endif
+
+/*
+ * This is the common exception handler.
+ * We get here from the user exception handler or simply by falling through
+ * from the kernel exception handler.
+ * Save the remaining special registers, switch to kernel mode, and jump
+ * to the second-level exception handler.
+ *
+ */
+
+common_exception:
+
+ /* Save EXCVADDR, DEBUGCAUSE, and PC, and clear LCOUNT */
+
+ rsr a2, DEBUGCAUSE
+ rsr a3, EPC_1
+ s32i a2, a1, PT_DEBUGCAUSE
+ s32i a3, a1, PT_PC
+
+ rsr a3, EXCVADDR
+ movi a2, 0
+ s32i a3, a1, PT_EXCVADDR
+ xsr a2, LCOUNT
+ s32i a2, a1, PT_LCOUNT
+
+ /* It is now save to restore the EXC_TABLE_FIXUP variable. */
+
+ rsr a0, EXCCAUSE
+ movi a3, 0
+ rsr a2, EXCSAVE_1
+ s32i a0, a1, PT_EXCCAUSE
+ s32i a3, a2, EXC_TABLE_FIXUP
+
+ /* All unrecoverable states are saved on stack, now, and a1 is valid,
+ * so we can allow exceptions and interrupts (*) again.
+ * Set PS(EXCM = 0, UM = 0, RING = 0, OWB = 0, WOE = 1, INTLEVEL = X)
+ *
+ * (*) We only allow interrupts if PS.INTLEVEL was not set to 1 before
+ * (interrupts disabled) and if this exception is not an interrupt.
+ */
+
+ rsr a3, PS
+ addi a0, a0, -4
+ movi a2, 1
+ extui a3, a3, 0, 1 # a3 = PS.INTLEVEL[0]
+ moveqz a3, a2, a0 # a3 = 1 iff interrupt exception
+ movi a2, PS_WOE_MASK
+ or a3, a3, a2
+ rsr a0, EXCCAUSE
+ xsr a3, PS
+
+ s32i a3, a1, PT_PS # save ps
+
+ /* Save LBEG, LEND */
+
+ rsr a2, LBEG
+ rsr a3, LEND
+ s32i a2, a1, PT_LBEG
+ s32i a3, a1, PT_LEND
+
+ /* Go to second-level dispatcher. Set up parameters to pass to the
+ * exception handler and call the exception handler.
+ */
+
+ movi a4, exc_table
+ mov a6, a1 # pass stack frame
+ mov a7, a0 # pass EXCCAUSE
+ addx4 a4, a0, a4
+ l32i a4, a4, EXC_TABLE_DEFAULT # load handler
+
+ /* Call the second-level handler */
+
+ callx4 a4
+
+ /* Jump here for exception exit */
+
+common_exception_return:
+
+ /* Jump if we are returning from kernel exceptions. */
+
+1: l32i a3, a1, PT_PS
+ _bbsi.l a3, PS_UM_SHIFT, 2f
+ j kernel_exception_exit
+
+ /* Specific to a user exception exit:
+ * We need to check some flags for signal handling and rescheduling,
+ * and have to restore WB and WS, extra states, and all registers
+ * in the register file that were in use in the user task.
+ */
+
+2: wsr a3, PS /* disable interrupts */
+
+ /* Check for signals (keep interrupts disabled while we read TI_FLAGS)
+ * Note: PS.INTLEVEL = 0, PS.EXCM = 1
+ */
+
+ GET_THREAD_INFO(a2,a1)
+ l32i a4, a2, TI_FLAGS
+
+ /* Enable interrupts again.
+ * Note: When we get here, we certainly have handled any interrupts.
+ * (Hint: There is only one user exception frame on stack)
+ */
+
+ movi a3, PS_WOE_MASK
+
+ _bbsi.l a4, TIF_NEED_RESCHED, 3f
+ _bbci.l a4, TIF_SIGPENDING, 4f
+
+#ifndef SIGNAL_HANDLING_IN_DOUBLE_EXCEPTION
+ l32i a4, a1, PT_DEPC
+ bgeui a4, VALID_DOUBLE_EXCEPTION_ADDRESS, 4f
+#endif
+
+ /* Reenable interrupts and call do_signal() */
+
+ wsr a3, PS
+ movi a4, do_signal # int do_signal(struct pt_regs*, sigset_t*)
+ mov a6, a1
+ movi a7, 0
+ callx4 a4
+ j 1b
+
+3: /* Reenable interrupts and reschedule */
+
+ wsr a3, PS
+ movi a4, schedule # void schedule (void)
+ callx4 a4
+ j 1b
+
+ /* Restore the state of the task and return from the exception. */
+
+
+ /* If we are returning from a user exception, and the process
+ * to run next has PT_SINGLESTEP set, we want to setup
+ * ICOUNT and ICOUNTLEVEL to step one instruction.
+ * PT_SINGLESTEP is set by sys_ptrace (ptrace.c)
+ */
+
+4: /* a2 holds GET_CURRENT(a2,a1) */
+
+ l32i a3, a2, TI_TASK
+ l32i a3, a3, TASK_PTRACE
+ bbci.l a3, PT_SINGLESTEP_BIT, 1f # jump if single-step flag is not set
+
+ movi a3, -2 # PT_SINGLESTEP flag is set,
+ movi a4, 1 # icountlevel of 1 means it won't
+ wsr a3, ICOUNT # start counting until after rfe
+ wsr a4, ICOUNTLEVEL # so setup icount & icountlevel.
+ isync
+
+1:
+
+#if XCHAL_EXTRA_SA_SIZE
+
+ /* For user exceptions, restore the extra state from the user's TCB. */
+
+ /* Note: a2 still contains GET_CURRENT(a2,a1) */
+ addi a2, a2, THREAD_CP_SAVE
+ xchal_extra_load_funcbody
+
+ /* We must assume that xchal_extra_store_funcbody destroys
+ * registers a2..a15. FIXME, this list can eventually be
+ * reduced once real register requirements of the macro are
+ * finalized. */
+
+#endif /* XCHAL_EXTRA_SA_SIZE */
+
+
+ /* Switch to the user thread WINDOWBASE. Save SP temporarily in DEPC */
+
+ l32i a2, a1, PT_WINDOWBASE
+ l32i a3, a1, PT_WINDOWSTART
+ wsr a1, DEPC # use DEPC as temp storage
+ wsr a3, WINDOWSTART # restore WINDOWSTART
+ ssr a2 # preserve user's WB in the SAR
+ wsr a2, WINDOWBASE # switch to user's saved WB
+ rsync
+ rsr a1, DEPC # restore stack pointer
+ l32i a2, a1, PT_WMASK # register frames saved (in bits 4...9)
+ rotw -1 # we restore a4..a7
+ _bltui a6, 16, 1f # only have to restore current window?
+
+ /* The working registers are a0 and a3. We are restoring to
+ * a4..a7. Be careful not to destroy what we have just restored.
+ * Note: wmask has the format YYYYM:
+ * Y: number of registers saved in groups of 4
+ * M: 4 bit mask of first 16 registers
+ */
+
+ mov a2, a6
+ mov a3, a5
+
+2: rotw -1 # a0..a3 become a4..a7
+ addi a3, a7, -4*4 # next iteration
+ addi a2, a6, -16 # decrementing Y in WMASK
+ l32i a4, a3, PT_AREG_END + 0
+ l32i a5, a3, PT_AREG_END + 4
+ l32i a6, a3, PT_AREG_END + 8
+ l32i a7, a3, PT_AREG_END + 12
+ _bgeui a2, 16, 2b
+
+ /* Clear unrestored registers (don't leak anything to user-land */
+
+1: rsr a0, WINDOWBASE
+ rsr a3, SAR
+ sub a3, a0, a3
+ beqz a3, 2f
+ extui a3, a3, 0, WBBITS
+
+1: rotw -1
+ addi a3, a7, -1
+ movi a4, 0
+ movi a5, 0
+ movi a6, 0
+ movi a7, 0
+ bgei a3, 1, 1b
+
+ /* We are back were we were when we started.
+ * Note: a2 still contains WMASK (if we've returned to the original
+ * frame where we had loaded a2), or at least the lower 4 bits
+ * (if we have restored WSBITS-1 frames).
+ */
+
+2: j common_exception_exit
+
+ /* This is the kernel exception exit.
+ * We avoided to do a MOVSP when we entered the exception, but we
+ * have to do it here.
+ */
+
+kernel_exception_exit:
+
+ /* Disable interrupts (a3 holds PT_PS) */
+
+ wsr a3, PS
+
+#ifdef PREEMPTIBLE_KERNEL
+
+#ifdef CONFIG_PREEMPT
+
+ /*
+ * Note: We've just returned from a call4, so we have
+ * at least 4 addt'l regs.
+ */
+
+ /* Check current_thread_info->preempt_count */
+
+ GET_THREAD_INFO(a2)
+ l32i a3, a2, TI_PREEMPT
+ bnez a3, 1f
+
+ l32i a2, a2, TI_FLAGS
+
+1:
+
+#endif
+
+#endif
+
+ /* Check if we have to do a movsp.
+ *
+ * We only have to do a movsp if the previous window-frame has
+ * been spilled to the *temporary* exception stack instead of the
+ * task's stack. This is the case if the corresponding bit in
+ * WINDOWSTART for the previous window-frame was set before
+ * (not spilled) but is zero now (spilled).
+ * If this bit is zero, all other bits except the one for the
+ * current window frame are also zero. So, we can use a simple test:
+ * 'and' WINDOWSTART and WINDOWSTART-1:
+ *
+ * (XXXXXX1[0]* - 1) AND XXXXXX1[0]* = XXXXXX0[0]*
+ *
+ * The result is zero only if one bit was set.
+ *
+ * (Note: We might have gone through several task switches before
+ * we come back to the current task, so WINDOWBASE might be
+ * different from the time the exception occurred.)
+ */
+
+ /* Test WINDOWSTART before and after the exception.
+ * We actually have WMASK, so we only have to test if it is 1 or not.
+ */
+
+ l32i a2, a1, PT_WMASK
+ _beqi a2, 1, common_exception_exit # Spilled before exception,jump
+
+ /* Test WINDOWSTART now. If spilled, do the movsp */
+
+ rsr a3, WINDOWSTART
+ addi a0, a3, -1
+ and a3, a3, a0
+ _bnez a3, common_exception_exit
+
+ /* Do a movsp (we returned from a call4, so we have at least a0..a7) */
+
+ addi a0, a1, -16
+ l32i a3, a0, 0
+ l32i a4, a0, 4
+ s32i a3, a1, PT_SIZE+0
+ s32i a4, a1, PT_SIZE+4
+ l32i a3, a0, 8
+ l32i a4, a0, 12
+ s32i a3, a1, PT_SIZE+8
+ s32i a4, a1, PT_SIZE+12
+
+ /* Common exception exit.
+ * We restore the special register and the current window frame, and
+ * return from the exception.
+ *
+ * Note: We expect a2 to hold PT_WMASK
+ */
+
+common_exception_exit:
+
+ _bbsi.l a2, 1, 1f
+ l32i a4, a1, PT_AREG4
+ l32i a5, a1, PT_AREG5
+ l32i a6, a1, PT_AREG6
+ l32i a7, a1, PT_AREG7
+ _bbsi.l a2, 2, 1f
+ l32i a8, a1, PT_AREG8
+ l32i a9, a1, PT_AREG9
+ l32i a10, a1, PT_AREG10
+ l32i a11, a1, PT_AREG11
+ _bbsi.l a2, 3, 1f
+ l32i a12, a1, PT_AREG12
+ l32i a13, a1, PT_AREG13
+ l32i a14, a1, PT_AREG14
+ l32i a15, a1, PT_AREG15
+
+ /* Restore PC, SAR */
+
+1: l32i a2, a1, PT_PC
+ l32i a3, a1, PT_SAR
+ wsr a2, EPC_1
+ wsr a3, SAR
+
+ /* Restore LBEG, LEND, LCOUNT */
+
+ l32i a2, a1, PT_LBEG
+ l32i a3, a1, PT_LEND
+ wsr a2, LBEG
+ l32i a2, a1, PT_LCOUNT
+ wsr a3, LEND
+ wsr a2, LCOUNT
+
+ /* Check if it was double exception. */
+
+ l32i a0, a1, PT_DEPC
+ l32i a3, a1, PT_AREG3
+ l32i a2, a1, PT_AREG2
+ _bgeui a0, VALID_DOUBLE_EXCEPTION_ADDRESS, 1f
+
+ /* Restore a0...a3 and return */
+
+ l32i a0, a1, PT_AREG0
+ l32i a1, a1, PT_AREG1
+ rfe
+
+1: wsr a0, DEPC
+ l32i a0, a1, PT_AREG0
+ l32i a1, a1, PT_AREG1
+ rfde
+
+/*
+ * Debug exception handler.
+ *
+ * Currently, we don't support KGDB, so only user application can be debugged.
+ *
+ * When we get here, a0 is trashed and saved to excsave[debuglevel]
+ */
+
+ENTRY(debug_exception)
+
+ rsr a0, EPS + XCHAL_DEBUGLEVEL
+ bbsi.l a0, PS_EXCM_SHIFT, 1f # exception mode
+
+ /* Set EPC_1 and EXCCAUSE */
+
+ wsr a2, DEPC # save a2 temporarily
+ rsr a2, EPC + XCHAL_DEBUGLEVEL
+ wsr a2, EPC_1
+
+ movi a2, EXCCAUSE_MAPPED_DEBUG
+ wsr a2, EXCCAUSE
+
+ /* Restore PS to the value before the debug exc but with PS.EXCM set.*/
+
+ movi a2, 1 << PS_EXCM_SHIFT
+ or a2, a0, a2
+ movi a0, debug_exception # restore a3, debug jump vector
+ wsr a2, PS
+ xsr a0, EXCSAVE + XCHAL_DEBUGLEVEL
+
+ /* Switch to kernel/user stack, restore jump vector, and save a0 */
+
+ bbsi.l a2, PS_UM_SHIFT, 2f # jump if user mode
+
+ addi a2, a1, -16-PT_SIZE # assume kernel stack
+ s32i a0, a2, PT_AREG0
+ movi a0, 0
+ s32i a1, a2, PT_AREG1
+ s32i a0, a2, PT_DEPC # mark it as a regular exception
+ xsr a0, DEPC
+ s32i a3, a2, PT_AREG3
+ s32i a0, a2, PT_AREG2
+ mov a1, a2
+ j _kernel_exception
+
+2: rsr a2, EXCSAVE_1
+ l32i a2, a2, EXC_TABLE_KSTK # load kernel stack pointer
+ s32i a0, a2, PT_AREG0
+ movi a0, 0
+ s32i a1, a2, PT_AREG1
+ s32i a0, a2, PT_DEPC
+ xsr a0, DEPC
+ s32i a3, a2, PT_AREG3
+ s32i a0, a2, PT_AREG2
+ mov a1, a2
+ j _user_exception
+
+ /* Debug exception while in exception mode. */
+1: j 1b // FIXME!!
+
+
+/*
+ * We get here in case of an unrecoverable exception.
+ * The only thing we can do is to be nice and print a panic message.
+ * We only produce a single stack frame for panic, so ???
+ *
+ *
+ * Entry conditions:
+ *
+ * - a0 contains the caller address; original value saved in excsave1.
+ * - the original a0 contains a valid return address (backtrace) or 0.
+ * - a2 contains a valid stackpointer
+ *
+ * Notes:
+ *
+ * - If the stack pointer could be invalid, the caller has to setup a
+ * dummy stack pointer (e.g. the stack of the init_task)
+ *
+ * - If the return address could be invalid, the caller has to set it
+ * to 0, so the backtrace would stop.
+ *
+ */
+ .align 4
+unrecoverable_text:
+ .ascii "Unrecoverable error in exception handler\0"
+
+ENTRY(unrecoverable_exception)
+
+ movi a0, 1
+ movi a1, 0
+
+ wsr a0, WINDOWSTART
+ wsr a1, WINDOWBASE
+ rsync
+
+ movi a1, PS_WOE_MASK | 1
+ wsr a1, PS
+ rsync
+
+ movi a1, init_task
+ movi a0, 0
+ addi a1, a1, PT_REGS_OFFSET
+
+ movi a4, panic
+ movi a6, unrecoverable_text
+
+ callx4 a4
+
+1: j 1b
+
+
+/* -------------------------- FAST EXCEPTION HANDLERS ----------------------- */
+
+/*
+ * Fast-handler for alloca exceptions
+ *
+ * The ALLOCA handler is entered when user code executes the MOVSP
+ * instruction and the caller's frame is not in the register file.
+ * In this case, the caller frame's a0..a3 are on the stack just
+ * below sp (a1), and this handler moves them.
+ *
+ * For "MOVSP <ar>,<as>" without destination register a1, this routine
+ * simply moves the value from <as> to <ar> without moving the save area.
+ *
+ * Entry condition:
+ *
+ * a0: trashed, original value saved on stack (PT_AREG0)
+ * a1: a1
+ * a2: new stack pointer, original in DEPC
+ * a3: dispatch table
+ * depc: a2, original value saved on stack (PT_DEPC)
+ * excsave_1: a3
+ *
+ * PT_DEPC >= VALID_DOUBLE_EXCEPTION_ADDRESS: double exception, DEPC
+ * < VALID_DOUBLE_EXCEPTION_ADDRESS: regular exception
+ */
+
+#if XCHAL_HAVE_BE
+#define _EXTUI_MOVSP_SRC(ar) extui ar, ar, 4, 4
+#define _EXTUI_MOVSP_DST(ar) extui ar, ar, 0, 4
+#else
+#define _EXTUI_MOVSP_SRC(ar) extui ar, ar, 0, 4
+#define _EXTUI_MOVSP_DST(ar) extui ar, ar, 4, 4
+#endif
+
+ENTRY(fast_alloca)
+
+ /* We shouldn't be in a double exception. */
+
+ l32i a0, a2, PT_DEPC
+ _bgeui a0, VALID_DOUBLE_EXCEPTION_ADDRESS, .Lunhandled_double
+
+ rsr a0, DEPC # get a2
+ s32i a4, a2, PT_AREG4 # save a4 and
+ s32i a0, a2, PT_AREG2 # a2 to stack
+
+ /* Exit critical section. */
+
+ movi a0, 0
+ s32i a0, a3, EXC_TABLE_FIXUP
+
+ /* Restore a3, excsave_1 */
+
+ xsr a3, EXCSAVE_1 # make sure excsave_1 is valid for dbl.
+ rsr a4, EPC_1 # get exception address
+ s32i a3, a2, PT_AREG3 # save a3 to stack
+
+#ifdef ALLOCA_EXCEPTION_IN_IRAM
+#error iram not supported
+#else
+ /* Note: l8ui not allowed in IRAM/IROM!! */
+ l8ui a0, a4, 1 # read as(src) from MOVSP instruction
+#endif
+ movi a3, .Lmovsp_src
+ _EXTUI_MOVSP_SRC(a0) # extract source register number
+ addx8 a3, a0, a3
+ jx a3
+
+.Lunhandled_double:
+ wsr a0, EXCSAVE_1
+ movi a0, unrecoverable_exception
+ callx0 a0
+
+ .align 8
+.Lmovsp_src:
+ l32i a3, a2, PT_AREG0; _j 1f; .align 8
+ mov a3, a1; _j 1f; .align 8
+ l32i a3, a2, PT_AREG2; _j 1f; .align 8
+ l32i a3, a2, PT_AREG3; _j 1f; .align 8
+ l32i a3, a2, PT_AREG4; _j 1f; .align 8
+ mov a3, a5; _j 1f; .align 8
+ mov a3, a6; _j 1f; .align 8
+ mov a3, a7; _j 1f; .align 8
+ mov a3, a8; _j 1f; .align 8
+ mov a3, a9; _j 1f; .align 8
+ mov a3, a10; _j 1f; .align 8
+ mov a3, a11; _j 1f; .align 8
+ mov a3, a12; _j 1f; .align 8
+ mov a3, a13; _j 1f; .align 8
+ mov a3, a14; _j 1f; .align 8
+ mov a3, a15; _j 1f; .align 8
+
+1:
+
+#ifdef ALLOCA_EXCEPTION_IN_IRAM
+#error iram not supported
+#else
+ l8ui a0, a4, 0 # read ar(dst) from MOVSP instruction
+#endif
+ addi a4, a4, 3 # step over movsp
+ _EXTUI_MOVSP_DST(a0) # extract destination register
+ wsr a4, EPC_1 # save new epc_1
+
+ _bnei a0, 1, 1f # no 'movsp a1, ax': jump
+
+ /* Move the save area. This implies the use of the L32E
+ * and S32E instructions, because this move must be done with
+ * the user's PS.RING privilege levels, not with ring 0
+ * (kernel's) privileges currently active with PS.EXCM
+ * set. Note that we have stil registered a fixup routine with the
+ * double exception vector in case a double exception occurs.
+ */
+
+ /* a0,a4:avail a1:old user stack a2:exc. stack a3:new user stack. */
+
+ l32e a0, a1, -16
+ l32e a4, a1, -12
+ s32e a0, a3, -16
+ s32e a4, a3, -12
+ l32e a0, a1, -8
+ l32e a4, a1, -4
+ s32e a0, a3, -8
+ s32e a4, a3, -4
+
+ /* Restore stack-pointer and all the other saved registers. */
+
+ mov a1, a3
+
+ l32i a4, a2, PT_AREG4
+ l32i a3, a2, PT_AREG3
+ l32i a0, a2, PT_AREG0
+ l32i a2, a2, PT_AREG2
+ rfe
+
+ /* MOVSP <at>,<as> was invoked with <at> != a1.
+ * Because the stack pointer is not being modified,
+ * we should be able to just modify the pointer
+ * without moving any save area.
+ * The processor only traps these occurrences if the
+ * caller window isn't live, so unfortunately we can't
+ * use this as an alternate trap mechanism.
+ * So we just do the move. This requires that we
+ * resolve the destination register, not just the source,
+ * so there's some extra work.
+ * (PERHAPS NOT REALLY NEEDED, BUT CLEANER...)
+ */
+
+ /* a0 dst-reg, a1 user-stack, a2 stack, a3 value of src reg. */
+
+1: movi a4, .Lmovsp_dst
+ addx8 a4, a0, a4
+ jx a4
+
+ .align 8
+.Lmovsp_dst:
+ s32i a3, a2, PT_AREG0; _j 1f; .align 8
+ mov a1, a3; _j 1f; .align 8
+ s32i a3, a2, PT_AREG2; _j 1f; .align 8
+ s32i a3, a2, PT_AREG3; _j 1f; .align 8
+ s32i a3, a2, PT_AREG4; _j 1f; .align 8
+ mov a5, a3; _j 1f; .align 8
+ mov a6, a3; _j 1f; .align 8
+ mov a7, a3; _j 1f; .align 8
+ mov a8, a3; _j 1f; .align 8
+ mov a9, a3; _j 1f; .align 8
+ mov a10, a3; _j 1f; .align 8
+ mov a11, a3; _j 1f; .align 8
+ mov a12, a3; _j 1f; .align 8
+ mov a13, a3; _j 1f; .align 8
+ mov a14, a3; _j 1f; .align 8
+ mov a15, a3; _j 1f; .align 8
+
+1: l32i a4, a2, PT_AREG4
+ l32i a3, a2, PT_AREG3
+ l32i a0, a2, PT_AREG0
+ l32i a2, a2, PT_AREG2
+ rfe
+
+
+/*
+ * fast system calls.
+ *
+ * WARNING: The kernel doesn't save the entire user context before
+ * handling a fast system call. These functions are small and short,
+ * usually offering some functionality not available to user tasks.
+ *
+ * BE CAREFUL TO PRESERVE THE USER'S CONTEXT.
+ *
+ * Entry condition:
+ *
+ * a0: trashed, original value saved on stack (PT_AREG0)
+ * a1: a1
+ * a2: new stack pointer, original in DEPC
+ * a3: dispatch table
+ * depc: a2, original value saved on stack (PT_DEPC)
+ * excsave_1: a3
+ */
+
+ENTRY(fast_syscall_kernel)
+
+ /* Skip syscall. */
+
+ rsr a0, EPC_1
+ addi a0, a0, 3
+ wsr a0, EPC_1
+
+ l32i a0, a2, PT_DEPC
+ bgeui a0, VALID_DOUBLE_EXCEPTION_ADDRESS, fast_syscall_unrecoverable
+
+ rsr a0, DEPC # get syscall-nr
+ _beqz a0, fast_syscall_spill_registers
+
+ addi a0, a0, -__NR_sysxtensa
+ _beqz a0, fast_syscall_sysxtensa
+
+ j kernel_exception
+
+
+ENTRY(fast_syscall_user)
+
+ /* Skip syscall. */
+
+ rsr a0, EPC_1
+ addi a0, a0, 3
+ wsr a0, EPC_1
+
+ l32i a0, a2, PT_DEPC
+ bgeui a0, VALID_DOUBLE_EXCEPTION_ADDRESS, fast_syscall_unrecoverable
+
+ rsr a0, DEPC # get syscall-nr
+ _beqz a0, fast_syscall_spill_registers
+
+ addi a0, a0, -__NR_sysxtensa
+ _beqz a0, fast_syscall_sysxtensa
+
+ j user_exception
+
+ENTRY(fast_syscall_unrecoverable)
+
+ /* Restore all states. */
+
+ l32i a0, a2, PT_AREG0 # restore a0
+ xsr a2, DEPC # restore a2, depc
+ rsr a3, EXCSAVE_1
+
+ wsr a0, EXCSAVE_1
+ movi a0, unrecoverable_exception
+ callx0 a0
+
+
+
+/*
+ * sysxtensa syscall handler
+ *
+ * int sysxtensa (XTENSA_ATOMIC_SET, ptr, val, unused);
+ * int sysxtensa (XTENSA_ATOMIC_ADD, ptr, val, unused);
+ * int sysxtensa (XTENSA_ATOMIC_EXG_ADD, ptr, val, unused);
+ * int sysxtensa (XTENSA_ATOMIC_CMP_SWP, ptr, oldval, newval);
+ * a2 a6 a3 a4 a5
+ *
+ * Entry condition:
+ *
+ * a0: trashed, original value saved on stack (PT_AREG0)
+ * a1: a1
+ * a2: new stack pointer, original in DEPC
+ * a3: dispatch table
+ * depc: a2, original value saved on stack (PT_DEPC)
+ * excsave_1: a3
+ *
+ * PT_DEPC >= VALID_DOUBLE_EXCEPTION_ADDRESS: double exception, DEPC
+ * < VALID_DOUBLE_EXCEPTION_ADDRESS: regular exception
+ *
+ * Note: we don't have to save a2; a2 holds the return value
+ *
+ * We use the two macros TRY and CATCH:
+ *
+ * TRY adds an entry to the __ex_table fixup table for the immediately
+ * following instruction.
+ *
+ * CATCH catches any exception that occurred at one of the preceeding TRY
+ * statements and continues from there
+ *
+ * Usage TRY l32i a0, a1, 0
+ * <other code>
+ * done: rfe
+ * CATCH <set return code>
+ * j done
+ */
+
+#define TRY \
+ .section __ex_table, "a"; \
+ .word 66f, 67f; \
+ .text; \
+66:
+
+#define CATCH \
+67:
+
+ENTRY(fast_syscall_sysxtensa)
+
+ _beqz a6, 1f
+ _blti a6, SYSXTENSA_COUNT, 2f
+
+1: j user_exception
+
+2: xsr a3, EXCSAVE_1 # restore a3, excsave1
+ s32i a7, a2, PT_AREG7
+
+ movi a7, 4 # sizeof(unsigned int)
+ verify_area a3, a7, a0, a2, .Leac
+
+ _beqi a6, SYSXTENSA_ATOMIC_SET, .Lset
+ _beqi a6, SYSXTENSA_ATOMIC_EXG_ADD, .Lexg
+ _beqi a6, SYSXTENSA_ATOMIC_ADD, .Ladd
+
+ /* Fall through for SYSXTENSA_ATOMIC_CMP_SWP */
+
+.Lswp: /* Atomic compare and swap */
+
+TRY l32i a7, a3, 0 # read old value
+ bne a7, a4, 1f # same as old value? jump
+ s32i a5, a3, 0 # different, modify value
+ movi a7, 1 # and return 1
+ j .Lret
+
+1: movi a7, 0 # same values: return 0
+ j .Lret
+
+.Ladd: /* Atomic add */
+.Lexg: /* Atomic (exchange) add */
+
+TRY l32i a7, a3, 0
+ add a4, a4, a7
+ s32i a4, a3, 0
+ j .Lret
+
+.Lset: /* Atomic set */
+
+TRY l32i a7, a3, 0 # read old value as return value
+ s32i a4, a3, 0 # write new value
+
+.Lret: mov a0, a2
+ mov a2, a7
+ l32i a7, a0, PT_AREG7
+ l32i a3, a0, PT_AREG3
+ l32i a0, a0, PT_AREG0
+ rfe
+
+CATCH
+.Leac: movi a7, -EFAULT
+ j .Lret
+
+
+
+/* fast_syscall_spill_registers.
+ *
+ * Entry condition:
+ *
+ * a0: trashed, original value saved on stack (PT_AREG0)
+ * a1: a1
+ * a2: new stack pointer, original in DEPC
+ * a3: dispatch table
+ * depc: a2, original value saved on stack (PT_DEPC)
+ * excsave_1: a3
+ *
+ * Note: We assume the stack pointer is EXC_TABLE_KSTK in the fixup handler.
+ * Note: We don't need to save a2 in depc (return value)
+ */
+
+ENTRY(fast_syscall_spill_registers)
+
+ /* Register a FIXUP handler (pass current wb as a parameter) */
+
+ movi a0, fast_syscall_spill_registers_fixup
+ s32i a0, a3, EXC_TABLE_FIXUP
+ rsr a0, WINDOWBASE
+ s32i a0, a3, EXC_TABLE_PARAM
+
+ /* Save a3 and SAR on stack. */
+
+ rsr a0, SAR
+ xsr a3, EXCSAVE_1 # restore a3 and excsave_1
+ s32i a0, a2, PT_AREG4 # store SAR to PT_AREG4
+ s32i a3, a2, PT_AREG3
+
+ /* The spill routine might clobber a7, a11, and a15. */
+
+ s32i a7, a2, PT_AREG5
+ s32i a11, a2, PT_AREG6
+ s32i a15, a2, PT_AREG7
+
+ call0 _spill_registers # destroys a3, DEPC, and SAR
+
+ /* Advance PC, restore registers and SAR, and return from exception. */
+
+ l32i a3, a2, PT_AREG4
+ l32i a0, a2, PT_AREG0
+ wsr a3, SAR
+ l32i a3, a2, PT_AREG3
+
+ /* Restore clobbered registers. */
+
+ l32i a7, a2, PT_AREG5
+ l32i a11, a2, PT_AREG6
+ l32i a15, a2, PT_AREG7
+
+ movi a2, 0
+ rfe
+
+/* Fixup handler.
+ *
+ * We get here if the spill routine causes an exception, e.g. tlb miss.
+ * We basically restore WINDOWBASE and WINDOWSTART to the condition when
+ * we entered the spill routine and jump to the user exception handler.
+ *
+ * a0: value of depc, original value in depc
+ * a2: trashed, original value in EXC_TABLE_DOUBLE_SAVE
+ * a3: exctable, original value in excsave1
+ */
+
+fast_syscall_spill_registers_fixup:
+
+ rsr a2, WINDOWBASE # get current windowbase (a2 is saved)
+ xsr a0, DEPC # restore depc and a0
+ ssl a2 # set shift (32 - WB)
+
+ /* We need to make sure the current registers (a0-a3) are preserved.
+ * To do this, we simply set the bit for the current window frame
+ * in WS, so that the exception handlers save them to the task stack.
+ */
+
+ rsr a3, EXCSAVE_1 # get spill-mask
+ slli a2, a3, 1 # shift left by one
+
+ slli a3, a2, 32-WSBITS
+ src a2, a2, a3 # a1 = xxwww1yyxxxwww1yy......
+ wsr a2, WINDOWSTART # set corrected windowstart
+
+ movi a3, exc_table
+ l32i a2, a3, EXC_TABLE_DOUBLE_SAVE # restore a2
+ l32i a3, a3, EXC_TABLE_PARAM # original WB (in user task)
+
+ /* Return to the original (user task) WINDOWBASE.
+ * We leave the following frame behind:
+ * a0, a1, a2 same
+ * a3: trashed (saved in excsave_1)
+ * depc: depc (we have to return to that address)
+ * excsave_1: a3
+ */
+
+ wsr a3, WINDOWBASE
+ rsync
+
+ /* We are now in the original frame when we entered _spill_registers:
+ * a0: return address
+ * a1: used, stack pointer
+ * a2: kernel stack pointer
+ * a3: available, saved in EXCSAVE_1
+ * depc: exception address
+ * excsave: a3
+ * Note: This frame might be the same as above.
+ */
+
+#ifdef SIGNAL_HANDLING_IN_DOUBLE_EXCEPTION
+ /* Restore registers we precautiously saved.
+ * We have the value of the 'right' a3
+ */
+
+ l32i a7, a2, PT_AREG5
+ l32i a11, a2, PT_AREG6
+ l32i a15, a2, PT_AREG7
+#endif
+
+ /* Setup stack pointer. */
+
+ addi a2, a2, -PT_USER_SIZE
+ s32i a0, a2, PT_AREG0
+
+ /* Make sure we return to this fixup handler. */
+
+ movi a3, fast_syscall_spill_registers_fixup_return
+ s32i a3, a2, PT_DEPC # setup depc
+
+ /* Jump to the exception handler. */
+
+ movi a3, exc_table
+ rsr a0, EXCCAUSE
+ addx4 a0, a0, a3 # find entry in table
+ l32i a0, a0, EXC_TABLE_FAST_USER # load handler
+ jx a0
+
+fast_syscall_spill_registers_fixup_return:
+
+ /* When we return here, all registers have been restored (a2: DEPC) */
+
+ wsr a2, DEPC # exception address
+
+ /* Restore fixup handler. */
+
+ xsr a3, EXCSAVE_1
+ movi a2, fast_syscall_spill_registers_fixup
+ s32i a2, a3, EXC_TABLE_FIXUP
+ rsr a2, WINDOWBASE
+ s32i a2, a3, EXC_TABLE_PARAM
+ l32i a2, a3, EXC_TABLE_KSTK
+
+#ifdef SIGNAL_HANDLING_IN_DOUBLE_EXCEPTION
+ /* Save registers again that might be clobbered. */
+
+ s32i a7, a2, PT_AREG5
+ s32i a11, a2, PT_AREG6
+ s32i a15, a2, PT_AREG7
+#endif
+
+ /* Load WB at the time the exception occurred. */
+
+ rsr a3, SAR # WB is still in SAR
+ neg a3, a3
+ wsr a3, WINDOWBASE
+ rsync
+
+ /* Restore a3 and return. */
+
+ movi a3, exc_table
+ xsr a3, EXCSAVE_1
+
+ rfde
+
+
+/*
+ * spill all registers.
+ *
+ * This is not a real function. The following conditions must be met:
+ *
+ * - must be called with call0.
+ * - uses DEPC, a3 and SAR.
+ * - the last 'valid' register of each frame are clobbered.
+ * - the caller must have registered a fixup handler
+ * (or be inside a critical section)
+ * - PS_EXCM must be set (PS_WOE cleared?)
+ */
+
+ENTRY(_spill_registers)
+
+ /*
+ * Rotate ws so that the current windowbase is at bit 0.
+ * Assume ws = xxxwww1yy (www1 current window frame).
+ * Rotate ws right so that a2 = yyxxxwww1.
+ */
+
+ wsr a2, DEPC # preserve a2
+ rsr a2, WINDOWBASE
+ rsr a3, WINDOWSTART
+ ssr a2 # holds WB
+ slli a2, a3, WSBITS
+ or a3, a3, a2 # a2 = xxxwww1yyxxxwww1yy
+ srl a3, a3
+
+ /* We are done if there are no more than the current register frame. */
+
+ extui a3, a3, 1, WSBITS-2 # a3 = 0yyxxxwww
+ movi a2, (1 << (WSBITS-1))
+ _beqz a3, .Lnospill # only one active frame? jump
+
+ /* We want 1 at the top, so that we return to the current windowbase */
+
+ or a3, a3, a2 # 1yyxxxwww
+
+ /* Skip empty frames - get 'oldest' WINDOWSTART-bit. */
+
+ wsr a3, WINDOWSTART # save shifted windowstart
+ neg a2, a3
+ and a3, a2, a3 # first bit set from right: 000010000
+
+ ffs_ws a2, a3 # a2: shifts to skip empty frames
+ movi a3, WSBITS
+ sub a2, a3, a2 # WSBITS-a2:number of 0-bits from right
+ ssr a2 # save in SAR for later.
+
+ rsr a3, WINDOWBASE
+ add a3, a3, a2
+ rsr a2, DEPC # restore a2
+ wsr a3, WINDOWBASE
+ rsync
+
+ rsr a3, WINDOWSTART
+ srl a3, a3 # shift windowstart
+
+ /* WB is now just one frame below the oldest frame in the register
+ window. WS is shifted so the oldest frame is in bit 0, thus, WB
+ and WS differ by one 4-register frame. */
+
+ /* Save frames. Depending what call was used (call4, call8, call12),
+ * we have to save 4,8. or 12 registers.
+ */
+
+ _bbsi.l a3, 1, .Lc4
+ _bbsi.l a3, 2, .Lc8
+
+ /* Special case: we have a call12-frame starting at a4. */
+
+ _bbci.l a3, 3, .Lc12 # bit 3 shouldn't be zero! (Jump to Lc12 first)
+
+ s32e a4, a1, -16 # a1 is valid with an empty spill area
+ l32e a4, a5, -12
+ s32e a8, a4, -48
+ mov a8, a4
+ l32e a4, a1, -16
+ j .Lc12c
+
+.Lloop: _bbsi.l a3, 1, .Lc4
+ _bbci.l a3, 2, .Lc12
+
+.Lc8: s32e a4, a13, -16
+ l32e a4, a5, -12
+ s32e a8, a4, -32
+ s32e a5, a13, -12
+ s32e a6, a13, -8
+ s32e a7, a13, -4
+ s32e a9, a4, -28
+ s32e a10, a4, -24
+ s32e a11, a4, -20
+
+ srli a11, a3, 2 # shift windowbase by 2
+ rotw 2
+ _bnei a3, 1, .Lloop
+
+.Lexit: /* Done. Do the final rotation, set WS, and return. */
+
+ rotw 1
+ rsr a3, WINDOWBASE
+ ssl a3
+ movi a3, 1
+ sll a3, a3
+ wsr a3, WINDOWSTART
+
+.Lnospill:
+ jx a0
+
+.Lc4: s32e a4, a9, -16
+ s32e a5, a9, -12
+ s32e a6, a9, -8
+ s32e a7, a9, -4
+
+ srli a7, a3, 1
+ rotw 1
+ _bnei a3, 1, .Lloop
+ j .Lexit
+
+.Lc12: _bbci.l a3, 3, .Linvalid_mask # bit 2 shouldn't be zero!
+
+ /* 12-register frame (call12) */
+
+ l32e a2, a5, -12
+ s32e a8, a2, -48
+ mov a8, a2
+
+.Lc12c: s32e a9, a8, -44
+ s32e a10, a8, -40
+ s32e a11, a8, -36
+ s32e a12, a8, -32
+ s32e a13, a8, -28
+ s32e a14, a8, -24
+ s32e a15, a8, -20
+ srli a15, a3, 3
+
+ /* The stack pointer for a4..a7 is out of reach, so we rotate the
+ * window, grab the stackpointer, and rotate back.
+ * Alternatively, we could also use the following approach, but that
+ * makes the fixup routine much more complicated:
+ * rotw 1
+ * s32e a0, a13, -16
+ * ...
+ * rotw 2
+ */
+
+ rotw 1
+ mov a5, a13
+ rotw -1
+
+ s32e a4, a9, -16
+ s32e a5, a9, -12
+ s32e a6, a9, -8
+ s32e a7, a9, -4
+
+ rotw 3
+
+ _beqi a3, 1, .Lexit
+ j .Lloop
+
+.Linvalid_mask:
+
+ /* We get here because of an unrecoverable error in the window
+ * registers. If we are in user space, we kill the application,
+ * however, this condition is unrecoverable in kernel space.
+ */
+
+ rsr a0, PS
+ _bbci.l a0, PS_UM_SHIFT, 1f
+
+ /* User space: Setup a dummy frame and kill application.
+ * Note: We assume EXC_TABLE_KSTK contains a valid stack pointer.
+ */
+
+ movi a0, 1
+ movi a1, 0
+
+ wsr a0, WINDOWSTART
+ wsr a1, WINDOWBASE
+ rsync
+
+ movi a0, 0
+
+ movi a3, exc_table
+ l32i a1, a3, EXC_TABLE_KSTK
+ wsr a3, EXCSAVE_1
+
+ movi a4, PS_WOE_MASK | 1
+ wsr a4, PS
+ rsync
+
+ movi a6, SIGSEGV
+ movi a4, do_exit
+ callx4 a4
+
+1: /* Kernel space: PANIC! */
+
+ wsr a0, EXCSAVE_1
+ movi a0, unrecoverable_exception
+ callx0 a0 # should not return
+1: j 1b
+
+/*
+ * We should never get here. Bail out!
+ */
+
+ENTRY(fast_second_level_miss_double_kernel)
+
+1: movi a0, unrecoverable_exception
+ callx0 a0 # should not return
+1: j 1b
+
+/* First-level entry handler for user, kernel, and double 2nd-level
+ * TLB miss exceptions. Note that for now, user and kernel miss
+ * exceptions share the same entry point and are handled identically.
+ *
+ * An old, less-efficient C version of this function used to exist.
+ * We include it below, interleaved as comments, for reference.
+ *
+ * Entry condition:
+ *
+ * a0: trashed, original value saved on stack (PT_AREG0)
+ * a1: a1
+ * a2: new stack pointer, original in DEPC
+ * a3: dispatch table
+ * depc: a2, original value saved on stack (PT_DEPC)
+ * excsave_1: a3
+ *
+ * PT_DEPC >= VALID_DOUBLE_EXCEPTION_ADDRESS: double exception, DEPC
+ * < VALID_DOUBLE_EXCEPTION_ADDRESS: regular exception
+ */
+
+ENTRY(fast_second_level_miss)
+
+ /* Save a1. Note: we don't expect a double exception. */
+
+ s32i a1, a2, PT_AREG1
+
+ /* We need to map the page of PTEs for the user task. Find
+ * the pointer to that page. Also, it's possible for tsk->mm
+ * to be NULL while tsk->active_mm is nonzero if we faulted on
+ * a vmalloc address. In that rare case, we must use
+ * active_mm instead to avoid a fault in this handler. See
+ *
+ * http://mail.nl.linux.org/linux-mm/2002-08/msg00258.html
+ * (or search Internet on "mm vs. active_mm")
+ *
+ * if (!mm)
+ * mm = tsk->active_mm;
+ * pgd = pgd_offset (mm, regs->excvaddr);
+ * pmd = pmd_offset (pgd, regs->excvaddr);
+ * pmdval = *pmd;
+ */
+
+ GET_CURRENT(a1,a2)
+ l32i a0, a1, TASK_MM # tsk->mm
+ beqz a0, 9f
+
+8: rsr a1, EXCVADDR # fault address
+ _PGD_OFFSET(a0, a1, a1)
+ l32i a0, a0, 0 # read pmdval
+ //beqi a0, _PAGE_USER, 2f
+ beqz a0, 2f
+
+ /* Read ptevaddr and convert to top of page-table page.
+ *
+ * vpnval = read_ptevaddr_register() & PAGE_MASK;
+ * vpnval += DTLB_WAY_PGTABLE;
+ * pteval = mk_pte (virt_to_page(pmd_val(pmdval)), PAGE_KERNEL);
+ * write_dtlb_entry (pteval, vpnval);
+ *
+ * The messy computation for 'pteval' above really simplifies
+ * into the following:
+ *
+ * pteval = ((pmdval - PAGE_OFFSET) & PAGE_MASK) | PAGE_KERNEL
+ */
+
+ movi a1, -PAGE_OFFSET
+ add a0, a0, a1 # pmdval - PAGE_OFFSET
+ extui a1, a0, 0, PAGE_SHIFT # ... & PAGE_MASK
+ xor a0, a0, a1
+
+
+ movi a1, PAGE_DIRECTORY
+ or a0, a0, a1 # ... | PAGE_DIRECTORY
+
+ rsr a1, PTEVADDR
+ srli a1, a1, PAGE_SHIFT
+ slli a1, a1, PAGE_SHIFT # ptevaddr & PAGE_MASK
+ addi a1, a1, DTLB_WAY_PGTABLE # ... + way_number
+
+ wdtlb a0, a1
+ dsync
+
+ /* Exit critical section. */
+
+ movi a0, 0
+ s32i a0, a3, EXC_TABLE_FIXUP
+
+ /* Restore the working registers, and return. */
+
+ l32i a0, a2, PT_AREG0
+ l32i a1, a2, PT_AREG1
+ l32i a2, a2, PT_DEPC
+ xsr a3, EXCSAVE_1
+
+ bgeui a2, VALID_DOUBLE_EXCEPTION_ADDRESS, 1f
+
+ /* Restore excsave1 and return. */
+
+ rsr a2, DEPC
+ rfe
+
+ /* Return from double exception. */
+
+1: xsr a2, DEPC
+ esync
+ rfde
+
+9: l32i a0, a1, TASK_ACTIVE_MM # unlikely case mm == 0
+ j 8b
+
+2: /* Invalid PGD, default exception handling */
+
+ rsr a1, DEPC
+ xsr a3, EXCSAVE_1
+ s32i a1, a2, PT_AREG2
+ s32i a3, a2, PT_AREG3
+ mov a1, a2
+
+ rsr a2, PS
+ bbsi.l a2, PS_UM_SHIFT, 1f
+ j _kernel_exception
+1: j _user_exception
+
+
+/*
+ * StoreProhibitedException
+ *
+ * Update the pte and invalidate the itlb mapping for this pte.
+ *
+ * Entry condition:
+ *
+ * a0: trashed, original value saved on stack (PT_AREG0)
+ * a1: a1
+ * a2: new stack pointer, original in DEPC
+ * a3: dispatch table
+ * depc: a2, original value saved on stack (PT_DEPC)
+ * excsave_1: a3
+ *
+ * PT_DEPC >= VALID_DOUBLE_EXCEPTION_ADDRESS: double exception, DEPC
+ * < VALID_DOUBLE_EXCEPTION_ADDRESS: regular exception
+ */
+
+ENTRY(fast_store_prohibited)
+
+ /* Save a1 and a4. */
+
+ s32i a1, a2, PT_AREG1
+ s32i a4, a2, PT_AREG4
+
+ GET_CURRENT(a1,a2)
+ l32i a0, a1, TASK_MM # tsk->mm
+ beqz a0, 9f
+
+8: rsr a1, EXCVADDR # fault address
+ _PGD_OFFSET(a0, a1, a4)
+ l32i a0, a0, 0
+ //beqi a0, _PAGE_USER, 2f # FIXME use _PAGE_INVALID
+ beqz a0, 2f
+
+ _PTE_OFFSET(a0, a1, a4)
+ l32i a4, a0, 0 # read pteval
+ movi a1, _PAGE_VALID | _PAGE_RW
+ bnall a4, a1, 2f
+
+ movi a1, _PAGE_ACCESSED | _PAGE_DIRTY | _PAGE_WRENABLE
+ or a4, a4, a1
+ rsr a1, EXCVADDR
+ s32i a4, a0, 0
+
+ /* We need to flush the cache if we have page coloring. */
+#if (DCACHE_WAY_SIZE > PAGE_SIZE) && XCHAL_DCACHE_IS_WRITEBACK
+ dhwb a0, 0
+#endif
+ pdtlb a0, a1
+ beqz a0, 1f
+ idtlb a0 // FIXME do we need this?
+ wdtlb a4, a0
+1:
+
+ /* Exit critical section. */
+
+ movi a0, 0
+ s32i a0, a3, EXC_TABLE_FIXUP
+
+ /* Restore the working registers, and return. */
+
+ l32i a4, a2, PT_AREG4
+ l32i a1, a2, PT_AREG1
+ l32i a0, a2, PT_AREG0
+ l32i a2, a2, PT_DEPC
+
+ /* Restore excsave1 and a3. */
+
+ xsr a3, EXCSAVE_1
+ bgeui a2, VALID_DOUBLE_EXCEPTION_ADDRESS, 1f
+
+ rsr a2, DEPC
+ rfe
+
+ /* Double exception. Restore FIXUP handler and return. */
+
+1: xsr a2, DEPC
+ esync
+ rfde
+
+9: l32i a0, a1, TASK_ACTIVE_MM # unlikely case mm == 0
+ j 8b
+
+2: /* If there was a problem, handle fault in C */
+
+ rsr a4, DEPC # still holds a2
+ xsr a3, EXCSAVE_1
+ s32i a4, a2, PT_AREG2
+ s32i a3, a2, PT_AREG3
+ l32i a4, a2, PT_AREG4
+ mov a1, a2
+
+ rsr a2, PS
+ bbsi.l a2, PS_UM_SHIFT, 1f
+ j _kernel_exception
+1: j _user_exception
+
+
+#if XCHAL_EXTRA_SA_SIZE
+
+#warning fast_coprocessor untested
+
+/*
+ * Entry condition:
+ *
+ * a0: trashed, original value saved on stack (PT_AREG0)
+ * a1: a1
+ * a2: new stack pointer, original in DEPC
+ * a3: dispatch table
+ * depc: a2, original value saved on stack (PT_DEPC)
+ * excsave_1: a3
+ *
+ * PT_DEPC >= VALID_DOUBLE_EXCEPTION_ADDRESS: double exception, DEPC
+ * < VALID_DOUBLE_EXCEPTION_ADDRESS: regular exception
+ */
+
+ENTRY(fast_coprocessor_double)
+ wsr a0, EXCSAVE_1
+ movi a0, unrecoverable_exception
+ callx0 a0
+
+ENTRY(fast_coprocessor)
+
+ /* Fatal if we are in a double exception. */
+
+ l32i a0, a2, PT_DEPC
+ _bgeui a0, VALID_DOUBLE_EXCEPTION_ADDRESS, fast_coprocessor_double
+
+ /* Save some registers a1, a3, a4, SAR */
+
+ xsr a3, EXCSAVE_1
+ s32i a3, a2, PT_AREG3
+ rsr a3, SAR
+ s32i a4, a2, PT_AREG4
+ s32i a1, a2, PT_AREG1
+ s32i a5, a1, PT_AREG5
+ s32i a3, a2, PT_SAR
+ mov a1, a2
+
+ /* Currently, the HAL macros only guarantee saving a0 and a1.
+ * These can and will be refined in the future, but for now,
+ * just save the remaining registers of a2...a15.
+ */
+ s32i a6, a1, PT_AREG6
+ s32i a7, a1, PT_AREG7
+ s32i a8, a1, PT_AREG8
+ s32i a9, a1, PT_AREG9
+ s32i a10, a1, PT_AREG10
+ s32i a11, a1, PT_AREG11
+ s32i a12, a1, PT_AREG12
+ s32i a13, a1, PT_AREG13
+ s32i a14, a1, PT_AREG14
+ s32i a15, a1, PT_AREG15
+
+ /* Find coprocessor number. Subtract first CP EXCCAUSE from EXCCAUSE */
+
+ rsr a0, EXCCAUSE
+ addi a3, a0, -XCHAL_EXCCAUSE_COPROCESSOR0_DISABLED
+
+ /* Set corresponding CPENABLE bit */
+
+ movi a4, 1
+ ssl a3 # SAR: 32 - coprocessor_number
+ rsr a5, CPENABLE
+ sll a4, a4
+ or a4, a5, a4
+ wsr a4, CPENABLE
+ rsync
+ movi a5, coprocessor_info # list of owner and offset into cp_save
+ addx8 a0, a4, a5 # entry for CP
+
+ bne a4, a5, .Lload # bit wasn't set before, cp not in use
+
+ /* Now compare the current task with the owner of the coprocessor.
+ * If they are the same, there is no reason to save or restore any
+ * coprocessor state. Having already enabled the coprocessor,
+ * branch ahead to return.
+ */
+ GET_CURRENT(a5,a1)
+ l32i a4, a0, COPROCESSOR_INFO_OWNER # a4: current owner for this CP
+ beq a4, a5, .Ldone
+
+ /* Find location to dump current coprocessor state:
+ * task_struct->task_cp_save_offset + coprocessor_offset[coprocessor]
+ *
+ * Note: a0 pointer to the entry in the coprocessor owner table,
+ * a3 coprocessor number,
+ * a4 current owner of coprocessor.
+ */
+ l32i a5, a0, COPROCESSOR_INFO_OFFSET
+ addi a2, a4, THREAD_CP_SAVE
+ add a2, a2, a5
+
+ /* Store current coprocessor states. (a5 still has CP number) */
+
+ xchal_cpi_store_funcbody
+
+ /* The macro might have destroyed a3 (coprocessor number), but
+ * SAR still has 32 - coprocessor_number!
+ */
+ movi a3, 32
+ rsr a4, SAR
+ sub a3, a3, a4
+
+.Lload: /* A new task now owns the corpocessors. Save its TCB pointer into
+ * the coprocessor owner table.
+ *
+ * Note: a0 pointer to the entry in the coprocessor owner table,
+ * a3 coprocessor number.
+ */
+ GET_CURRENT(a4,a1)
+ s32i a4, a0, 0
+
+ /* Find location from where to restore the current coprocessor state.*/
+
+ l32i a5, a0, COPROCESSOR_INFO_OFFSET
+ addi a2, a4, THREAD_CP_SAVE
+ add a2, a2, a4
+
+ xchal_cpi_load_funcbody
+
+ /* We must assume that the xchal_cpi_store_funcbody macro destroyed
+ * registers a2..a15.
+ */
+
+.Ldone: l32i a15, a1, PT_AREG15
+ l32i a14, a1, PT_AREG14
+ l32i a13, a1, PT_AREG13
+ l32i a12, a1, PT_AREG12
+ l32i a11, a1, PT_AREG11
+ l32i a10, a1, PT_AREG10
+ l32i a9, a1, PT_AREG9
+ l32i a8, a1, PT_AREG8
+ l32i a7, a1, PT_AREG7
+ l32i a6, a1, PT_AREG6
+ l32i a5, a1, PT_AREG5
+ l32i a4, a1, PT_AREG4
+ l32i a3, a1, PT_AREG3
+ l32i a2, a1, PT_AREG2
+ l32i a0, a1, PT_AREG0
+ l32i a1, a1, PT_AREG1
+
+ rfe
+
+#endif /* XCHAL_EXTRA_SA_SIZE */
+
+/*
+ * Task switch.
+ *
+ * struct task* _switch_to (struct task* prev, struct task* next)
+ * a2 a2 a3
+ */
+
+ENTRY(_switch_to)
+
+ entry a1, 16
+
+ mov a4, a3 # preserve a3
+
+ s32i a0, a2, THREAD_RA # save return address
+ s32i a1, a2, THREAD_SP # save stack pointer
+
+ /* Disable ints while we manipulate the stack pointer; spill regs. */
+
+ movi a5, PS_EXCM_MASK | LOCKLEVEL
+ xsr a5, PS
+ rsr a3, EXCSAVE_1
+ rsync
+ s32i a3, a3, EXC_TABLE_FIXUP /* enter critical section */
+
+ call0 _spill_registers
+
+ /* Set kernel stack (and leave critical section)
+ * Note: It's save to set it here. The stack will not be overwritten
+ * because the kernel stack will only be loaded again after
+ * we return from kernel space.
+ */
+
+ l32i a0, a4, TASK_THREAD_INFO
+ rsr a3, EXCSAVE_1 # exc_table
+ movi a1, 0
+ addi a0, a0, PT_REGS_OFFSET
+ s32i a1, a3, EXC_TABLE_FIXUP
+ s32i a0, a3, EXC_TABLE_KSTK
+
+ /* restore context of the task that 'next' addresses */
+
+ l32i a0, a4, THREAD_RA /* restore return address */
+ l32i a1, a4, THREAD_SP /* restore stack pointer */
+
+ wsr a5, PS
+ rsync
+
+ retw
+
+
+ENTRY(ret_from_fork)
+
+ /* void schedule_tail (struct task_struct *prev)
+ * Note: prev is still in a6 (return value from fake call4 frame)
+ */
+ movi a4, schedule_tail
+ callx4 a4
+
+ movi a4, do_syscall_trace
+ callx4 a4
+
+ j common_exception_return
+
+
+
+/*
+ * Table of syscalls
+ */
+
+.data
+.align 4
+.global sys_call_table
+sys_call_table:
+
+#define SYSCALL(call, narg) .word call
+#include "syscalls.h"
+
+/*
+ * Number of arguments of each syscall
+ */
+
+.global sys_narg_table
+sys_narg_table:
+
+#undef SYSCALL
+#define SYSCALL(call, narg) .byte narg
+#include "syscalls.h"
+
--- /dev/null
+/*
+ * arch/xtensa/kernel/head.S
+ *
+ * Xtensa Processor startup code.
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2001 - 2005 Tensilica Inc.
+ *
+ * Chris Zankel <chris@zankel.net>
+ * Marc Gauthier <marc@tensilica.com, marc@alumni.uwaterloo.ca>
+ * Joe Taylor <joe@tensilica.com, joetylr@yahoo.com>
+ * Kevin Chea
+ */
+
+#include <xtensa/cacheasm.h>
+#include <linux/config.h>
+#include <asm/processor.h>
+#include <asm/page.h>
+
+/*
+ * This module contains the entry code for kernel images. It performs the
+ * minimal setup needed to call the generic C routines.
+ *
+ * Prerequisites:
+ *
+ * - The kernel image has been loaded to the actual address where it was
+ * compiled to.
+ * - a2 contains either 0 or a pointer to a list of boot parameters.
+ * (see setup.c for more details)
+ *
+ */
+
+ .macro iterate from, to , cmd
+ .ifeq ((\to - \from) & ~0xfff)
+ \cmd \from
+ iterate "(\from+1)", \to, \cmd
+ .endif
+ .endm
+
+/*
+ * _start
+ *
+ * The bootloader passes a pointer to a list of boot parameters in a2.
+ */
+
+ /* The first bytes of the kernel image must be an instruction, so we
+ * manually allocate and define the literal constant we need for a jx
+ * instruction.
+ */
+
+ .section .head.text, "ax"
+ .globl _start
+_start: _j 2f
+ .align 4
+1: .word _startup
+2: l32r a0, 1b
+ jx a0
+
+ .text
+ .align 4
+_startup:
+
+ /* Disable interrupts and exceptions. */
+
+ movi a0, XCHAL_PS_EXCM_MASK
+ wsr a0, PS
+
+ /* Preserve the pointer to the boot parameter list in EXCSAVE_1 */
+
+ wsr a2, EXCSAVE_1
+
+ /* Start with a fresh windowbase and windowstart. */
+
+ movi a1, 1
+ movi a0, 0
+ wsr a1, WINDOWSTART
+ wsr a0, WINDOWBASE
+ rsync
+
+ /* Set a0 to 0 for the remaining initialization. */
+
+ movi a0, 0
+
+ /* Clear debugging registers. */
+
+#if XCHAL_HAVE_DEBUG
+ wsr a0, IBREAKENABLE
+ wsr a0, ICOUNT
+ movi a1, 15
+ wsr a0, ICOUNTLEVEL
+
+ .macro reset_dbreak num
+ wsr a0, DBREAKC + \num
+ .endm
+
+ iterate 0, XCHAL_NUM_IBREAK-1, reset_dbreak
+#endif
+
+ /* Clear CCOUNT (not really necessary, but nice) */
+
+ wsr a0, CCOUNT # not really necessary, but nice
+
+ /* Disable zero-loops. */
+
+#if XCHAL_HAVE_LOOPS
+ wsr a0, LCOUNT
+#endif
+
+ /* Disable all timers. */
+
+ .macro reset_timer num
+ wsr a0, CCOMPARE_0 + \num
+ .endm
+ iterate 0, XCHAL_NUM_TIMERS-1, reset_timer
+
+ /* Interrupt initialization. */
+
+ movi a2, XCHAL_INTTYPE_MASK_SOFTWARE | XCHAL_INTTYPE_MASK_EXTERN_EDGE
+ wsr a0, INTENABLE
+ wsr a2, INTCLEAR
+
+ /* Disable coprocessors. */
+
+#if XCHAL_CP_NUM > 0
+ wsr a0, CPENABLE
+#endif
+
+ /* Set PS.INTLEVEL=1, PS.WOE=0, kernel stack, PS.EXCM=0
+ *
+ * Note: PS.EXCM must be cleared before using any loop
+ * instructions; otherwise, they are silently disabled, and
+ * at most one iteration of the loop is executed.
+ */
+
+ movi a1, 1
+ wsr a1, PS
+ rsync
+
+ /* Initialize the caches.
+ * Does not include flushing writeback d-cache.
+ * a6, a7 are just working registers (clobbered).
+ */
+
+ icache_reset a2, a3
+ dcache_reset a2, a3
+
+ /* Unpack data sections
+ *
+ * The linker script used to build the Linux kernel image
+ * creates a table located at __boot_reloc_table_start
+ * that contans the information what data needs to be unpacked.
+ *
+ * Uses a2-a7.
+ */
+
+ movi a2, __boot_reloc_table_start
+ movi a3, __boot_reloc_table_end
+
+1: beq a2, a3, 3f # no more entries?
+ l32i a4, a2, 0 # start destination (in RAM)
+ l32i a5, a2, 4 # end desination (in RAM)
+ l32i a6, a2, 8 # start source (in ROM)
+ addi a2, a2, 12 # next entry
+ beq a4, a5, 1b # skip, empty entry
+ beq a4, a6, 1b # skip, source and dest. are the same
+
+2: l32i a7, a6, 0 # load word
+ addi a6, a6, 4
+ s32i a7, a4, 0 # store word
+ addi a4, a4, 4
+ bltu a4, a5, 2b
+ j 1b
+
+3:
+ /* All code and initialized data segments have been copied.
+ * Now clear the BSS segment.
+ */
+
+ movi a2, _bss_start # start of BSS
+ movi a3, _bss_end # end of BSS
+
+1: addi a2, a2, 4
+ s32i a0, a2, 0
+ blt a2, a3, 1b
+
+#if XCHAL_DCACHE_IS_WRITEBACK
+
+ /* After unpacking, flush the writeback cache to memory so the
+ * instructions/data are available.
+ */
+
+ dcache_writeback_all a2, a3
+#endif
+
+ /* Setup stack and enable window exceptions (keep irqs disabled) */
+
+ movi a1, init_thread_union
+ addi a1, a1, KERNEL_STACK_SIZE
+
+ movi a2, 0x00040001 # WOE=1, INTLEVEL=1, UM=0
+ wsr a2, PS # (enable reg-windows; progmode stack)
+ rsync
+
+ /* Set up EXCSAVE[DEBUGLEVEL] to point to the Debug Exception Handler.*/
+
+ movi a2, debug_exception
+ wsr a2, EXCSAVE + XCHAL_DEBUGLEVEL
+
+ /* Set up EXCSAVE[1] to point to the exc_table. */
+
+ movi a6, exc_table
+ xsr a6, EXCSAVE_1
+
+ /* init_arch kick-starts the linux kernel */
+
+ movi a4, init_arch
+ callx4 a4
+
+ movi a4, start_kernel
+ callx4 a4
+
+should_never_return:
+ j should_never_return
+
+ /* Define some common data structures here. We define them
+ * here in this assembly file due to their unusual alignment
+ * requirements.
+ */
+
+ .comm swapper_pg_dir,PAGE_SIZE,PAGE_SIZE
+ .comm empty_bad_page_table,PAGE_SIZE,PAGE_SIZE
+ .comm empty_bad_page,PAGE_SIZE,PAGE_SIZE
+ .comm empty_zero_page,PAGE_SIZE,PAGE_SIZE
+
--- /dev/null
+/*
+ * linux/arch/xtensa/kernel/irq.c
+ *
+ * Xtensa built-in interrupt controller and some generic functions copied
+ * from i386.
+ *
+ * Copyright (C) 2002 - 2005 Tensilica, Inc.
+ * Copyright (C) 1992, 1998 Linus Torvalds, Ingo Molnar
+ *
+ *
+ * Chris Zankel <chris@zankel.net>
+ * Kevin Chea
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/seq_file.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/kernel_stat.h>
+
+#include <asm/uaccess.h>
+#include <asm/platform.h>
+
+static void enable_xtensa_irq(unsigned int irq);
+static void disable_xtensa_irq(unsigned int irq);
+static void mask_and_ack_xtensa(unsigned int irq);
+static void end_xtensa_irq(unsigned int irq);
+
+static unsigned int cached_irq_mask;
+
+atomic_t irq_err_count;
+
+/*
+ * 'what should we do if we get a hw irq event on an illegal vector'.
+ * each architecture has to answer this themselves.
+ */
+void ack_bad_irq(unsigned int irq)
+{
+ printk("unexpected IRQ trap at vector %02x\n", irq);
+}
+
+/*
+ * do_IRQ handles all normal device IRQ's (the special
+ * SMP cross-CPU interrupts have their own specific
+ * handlers).
+ */
+
+unsigned int do_IRQ(int irq, struct pt_regs *regs)
+{
+ irq_enter();
+
+#ifdef CONFIG_DEBUG_STACKOVERFLOW
+ /* Debugging check for stack overflow: is there less than 1KB free? */
+ {
+ unsigned long sp;
+
+ __asm__ __volatile__ ("mov %0, a1\n" : "=a" (sp));
+ sp &= THREAD_SIZE - 1;
+
+ if (unlikely(sp < (sizeof(thread_info) + 1024)))
+ printk("Stack overflow in do_IRQ: %ld\n",
+ sp - sizeof(struct thread_info));
+ }
+#endif
+
+ __do_IRQ(irq, regs);
+
+ irq_exit();
+
+ return 1;
+}
+
+/*
+ * Generic, controller-independent functions:
+ */
+
+int show_interrupts(struct seq_file *p, void *v)
+{
+ int i = *(loff_t *) v, j;
+ struct irqaction * action;
+ unsigned long flags;
+
+ if (i == 0) {
+ seq_printf(p, " ");
+ for (j=0; j<NR_CPUS; j++)
+ if (cpu_online(j))
+ seq_printf(p, "CPU%d ",j);
+ seq_putc(p, '\n');
+ }
+
+ if (i < NR_IRQS) {
+ spin_lock_irqsave(&irq_desc[i].lock, flags);
+ action = irq_desc[i].action;
+ if (!action)
+ goto skip;
+ seq_printf(p, "%3d: ",i);
+#ifndef CONFIG_SMP
+ seq_printf(p, "%10u ", kstat_irqs(i));
+#else
+ for (j = 0; j < NR_CPUS; j++)
+ if (cpu_online(j))
+ seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]);
+#endif
+ seq_printf(p, " %14s", irq_desc[i].handler->typename);
+ seq_printf(p, " %s", action->name);
+
+ for (action=action->next; action; action = action->next)
+ seq_printf(p, ", %s", action->name);
+
+ seq_putc(p, '\n');
+skip:
+ spin_unlock_irqrestore(&irq_desc[i].lock, flags);
+ } else if (i == NR_IRQS) {
+ seq_printf(p, "NMI: ");
+ for (j = 0; j < NR_CPUS; j++)
+ if (cpu_online(j))
+ seq_printf(p, "%10u ", nmi_count(j));
+ seq_putc(p, '\n');
+ seq_printf(p, "ERR: %10u\n", atomic_read(&irq_err_count));
+ }
+ return 0;
+}
+/* shutdown is same as "disable" */
+#define shutdown_xtensa_irq disable_xtensa_irq
+
+static unsigned int startup_xtensa_irq(unsigned int irq)
+{
+ enable_xtensa_irq(irq);
+ return 0; /* never anything pending */
+}
+
+static struct hw_interrupt_type xtensa_irq_type = {
+ "Xtensa-IRQ",
+ startup_xtensa_irq,
+ shutdown_xtensa_irq,
+ enable_xtensa_irq,
+ disable_xtensa_irq,
+ mask_and_ack_xtensa,
+ end_xtensa_irq
+};
+
+static inline void mask_irq(unsigned int irq)
+{
+ cached_irq_mask &= ~(1 << irq);
+ set_sr (cached_irq_mask, INTENABLE);
+}
+
+static inline void unmask_irq(unsigned int irq)
+{
+ cached_irq_mask |= 1 << irq;
+ set_sr (cached_irq_mask, INTENABLE);
+}
+
+static void disable_xtensa_irq(unsigned int irq)
+{
+ unsigned long flags;
+ local_save_flags(flags);
+ mask_irq(irq);
+ local_irq_restore(flags);
+}
+
+static void enable_xtensa_irq(unsigned int irq)
+{
+ unsigned long flags;
+ local_save_flags(flags);
+ unmask_irq(irq);
+ local_irq_restore(flags);
+}
+
+static void mask_and_ack_xtensa(unsigned int irq)
+{
+ disable_xtensa_irq(irq);
+}
+
+static void end_xtensa_irq(unsigned int irq)
+{
+ enable_xtensa_irq(irq);
+}
+
+
+void __init init_IRQ(void)
+{
+ int i;
+
+ for (i=0; i < XTENSA_NR_IRQS; i++)
+ irq_desc[i].handler = &xtensa_irq_type;
+
+ cached_irq_mask = 0;
+
+ platform_init_irq();
+}
--- /dev/null
+/*
+ * arch/xtensa/kernel/platform.c
+ *
+ * Module support.
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2001 - 2005 Tensilica Inc.
+ *
+ * Chris Zankel <chris@zankel.net>
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/moduleloader.h>
+#include <linux/elf.h>
+#include <linux/vmalloc.h>
+#include <linux/fs.h>
+#include <linux/string.h>
+#include <linux/kernel.h>
+#include <linux/cache.h>
+
+LIST_HEAD(module_buf_list);
+
+void *module_alloc(unsigned long size)
+{
+ panic("module_alloc not implemented");
+}
+
+void module_free(struct module *mod, void *module_region)
+{
+ panic("module_free not implemented");
+}
+
+int module_frob_arch_sections(Elf32_Ehdr *hdr,
+ Elf32_Shdr *sechdrs,
+ char *secstrings,
+ struct module *me)
+{
+ panic("module_frob_arch_sections not implemented");
+}
+
+int apply_relocate(Elf32_Shdr *sechdrs,
+ const char *strtab,
+ unsigned int symindex,
+ unsigned int relsec,
+ struct module *module)
+{
+ panic ("apply_relocate not implemented");
+}
+
+int apply_relocate_add(Elf32_Shdr *sechdrs,
+ const char *strtab,
+ unsigned int symindex,
+ unsigned int relsec,
+ struct module *module)
+{
+ panic("apply_relocate_add not implemented");
+}
+
+int module_finalize(const Elf_Ehdr *hdr,
+ const Elf_Shdr *sechdrs,
+ struct module *me)
+{
+ panic ("module_finalize not implemented");
+}
+
+void module_arch_cleanup(struct module *mod)
+{
+ panic("module_arch_cleanup not implemented");
+}
+
+struct bug_entry *module_find_bug(unsigned long bugaddr)
+{
+ panic("module_find_bug not implemented");
+}
--- /dev/null
+/*
+ * arch/xtensa/pci-dma.c
+ *
+ * DMA coherent memory allocation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ * Copyright (C) 2002 - 2005 Tensilica Inc.
+ *
+ * Based on version for i386.
+ *
+ * Chris Zankel <chris@zankel.net>
+ * Joe Taylor <joe@tensilica.com, joetylr@yahoo.com>
+ */
+
+#include <linux/types.h>
+#include <linux/mm.h>
+#include <linux/string.h>
+#include <linux/pci.h>
+#include <asm/io.h>
+#include <asm/cacheflush.h>
+
+/*
+ * Note: We assume that the full memory space is always mapped to 'kseg'
+ * Otherwise we have to use page attributes (not implemented).
+ */
+
+void *
+dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *handle, int gfp)
+{
+ void *ret;
+
+ /* ignore region speicifiers */
+ gfp &= ~(__GFP_DMA | __GFP_HIGHMEM);
+
+ if (dev == NULL || (*dev->dma_mask < 0xffffffff))
+ gfp |= GFP_DMA;
+ ret = (void *)__get_free_pages(gfp, get_order(size));
+
+ if (ret != NULL) {
+ memset(ret, 0, size);
+ *handle = virt_to_bus(ret);
+ }
+ return (void*) BYPASS_ADDR((unsigned long)ret);
+}
+
+void dma_free_coherent(struct device *hwdev, size_t size,
+ void *vaddr, dma_addr_t dma_handle)
+{
+ free_pages(CACHED_ADDR((unsigned long)vaddr), get_order(size));
+}
+
+
+void consistent_sync(void *vaddr, size_t size, int direction)
+{
+ switch (direction) {
+ case PCI_DMA_NONE:
+ BUG();
+ case PCI_DMA_FROMDEVICE: /* invalidate only */
+ __invalidate_dcache_range((unsigned long)vaddr,
+ (unsigned long)size);
+ break;
+
+ case PCI_DMA_TODEVICE: /* writeback only */
+ case PCI_DMA_BIDIRECTIONAL: /* writeback and invalidate */
+ __flush_invalidate_dcache_range((unsigned long)vaddr,
+ (unsigned long)size);
+ break;
+ }
+}
--- /dev/null
+/*
+ * arch/xtensa/pcibios.c
+ *
+ * PCI bios-type initialisation for PCI machines
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ * Copyright (C) 2001-2005 Tensilica Inc.
+ *
+ * Based largely on work from Cort (ppc/kernel/pci.c)
+ * IO functions copied from sparc.
+ *
+ * Chris Zankel <chris@zankel.net>
+ *
+ */
+
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/pci.h>
+#include <linux/delay.h>
+#include <linux/string.h>
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/errno.h>
+#include <linux/bootmem.h>
+
+#include <asm/pci-bridge.h>
+#include <asm/platform.h>
+
+#undef DEBUG
+
+#ifdef DEBUG
+#define DBG(x...) printk(x)
+#else
+#define DBG(x...)
+#endif
+
+/* PCI Controller */
+
+
+/*
+ * pcibios_alloc_controller
+ * pcibios_enable_device
+ * pcibios_fixups
+ * pcibios_align_resource
+ * pcibios_fixup_bus
+ * pcibios_setup
+ * pci_bus_add_device
+ * pci_mmap_page_range
+ */
+
+struct pci_controller* pci_ctrl_head;
+struct pci_controller** pci_ctrl_tail = &pci_ctrl_head;
+
+static int pci_bus_count;
+
+static void pcibios_fixup_resources(struct pci_dev* dev);
+
+#if 0 // FIXME
+struct pci_fixup pcibios_fixups[] = {
+ { DECLARE_PCI_FIXUP_HEADER, PCI_ANY_ID, PCI_ANY_ID, pcibios_fixup_resources },
+ { 0 }
+};
+#endif
+
+void
+pcibios_update_resource(struct pci_dev *dev, struct resource *root,
+ struct resource *res, int resource)
+{
+ u32 new, check, mask;
+ int reg;
+ struct pci_controller* pci_ctrl = dev->sysdata;
+
+ new = res->start;
+ if (pci_ctrl && res->flags & IORESOURCE_IO) {
+ new -= pci_ctrl->io_space.base;
+ }
+ new |= (res->flags & PCI_REGION_FLAG_MASK);
+ if (resource < 6) {
+ reg = PCI_BASE_ADDRESS_0 + 4*resource;
+ } else if (resource == PCI_ROM_RESOURCE) {
+ res->flags |= PCI_ROM_ADDRESS_ENABLE;
+ reg = dev->rom_base_reg;
+ } else {
+ /* Somebody might have asked allocation of a non-standard resource */
+ return;
+ }
+
+ pci_write_config_dword(dev, reg, new);
+ pci_read_config_dword(dev, reg, &check);
+ mask = (new & PCI_BASE_ADDRESS_SPACE_IO) ?
+ PCI_BASE_ADDRESS_IO_MASK : PCI_BASE_ADDRESS_MEM_MASK;
+
+ if ((new ^ check) & mask) {
+ printk(KERN_ERR "PCI: Error while updating region "
+ "%s/%d (%08x != %08x)\n", dev->slot_name, resource,
+ new, check);
+ }
+}
+
+/*
+ * We need to avoid collisions with `mirrored' VGA ports
+ * and other strange ISA hardware, so we always want the
+ * addresses to be allocated in the 0x000-0x0ff region
+ * modulo 0x400.
+ *
+ * Why? Because some silly external IO cards only decode
+ * the low 10 bits of the IO address. The 0x00-0xff region
+ * is reserved for motherboard devices that decode all 16
+ * bits, so it's ok to allocate at, say, 0x2800-0x28ff,
+ * but we want to try to avoid allocating at 0x2900-0x2bff
+ * which might have be mirrored at 0x0100-0x03ff..
+ */
+void
+pcibios_align_resource(void *data, struct resource *res, unsigned long size,
+ unsigned long align)
+{
+ struct pci_dev *dev = data;
+
+ if (res->flags & IORESOURCE_IO) {
+ unsigned long start = res->start;
+
+ if (size > 0x100) {
+ printk(KERN_ERR "PCI: I/O Region %s/%d too large"
+ " (%ld bytes)\n", dev->slot_name,
+ dev->resource - res, size);
+ }
+
+ if (start & 0x300) {
+ start = (start + 0x3ff) & ~0x3ff;
+ res->start = start;
+ }
+ }
+}
+
+int
+pcibios_enable_resources(struct pci_dev *dev, int mask)
+{
+ u16 cmd, old_cmd;
+ int idx;
+ struct resource *r;
+
+ pci_read_config_word(dev, PCI_COMMAND, &cmd);
+ old_cmd = cmd;
+ for(idx=0; idx<6; idx++) {
+ r = &dev->resource[idx];
+ if (!r->start && r->end) {
+ printk (KERN_ERR "PCI: Device %s not available because "
+ "of resource collisions\n", dev->slot_name);
+ return -EINVAL;
+ }
+ if (r->flags & IORESOURCE_IO)
+ cmd |= PCI_COMMAND_IO;
+ if (r->flags & IORESOURCE_MEM)
+ cmd |= PCI_COMMAND_MEMORY;
+ }
+ if (dev->resource[PCI_ROM_RESOURCE].start)
+ cmd |= PCI_COMMAND_MEMORY;
+ if (cmd != old_cmd) {
+ printk("PCI: Enabling device %s (%04x -> %04x)\n",
+ dev->slot_name, old_cmd, cmd);
+ pci_write_config_word(dev, PCI_COMMAND, cmd);
+ }
+ return 0;
+}
+
+struct pci_controller * __init pcibios_alloc_controller(void)
+{
+ struct pci_controller *pci_ctrl;
+
+ pci_ctrl = (struct pci_controller *)alloc_bootmem(sizeof(*pci_ctrl));
+ memset(pci_ctrl, 0, sizeof(struct pci_controller));
+
+ *pci_ctrl_tail = pci_ctrl;
+ pci_ctrl_tail = &pci_ctrl->next;
+
+ return pci_ctrl;
+}
+
+static int __init pcibios_init(void)
+{
+ struct pci_controller *pci_ctrl;
+ struct pci_bus *bus;
+ int next_busno = 0, i;
+
+ printk("PCI: Probing PCI hardware\n");
+
+ /* Scan all of the recorded PCI controllers. */
+ for (pci_ctrl = pci_ctrl_head; pci_ctrl; pci_ctrl = pci_ctrl->next) {
+ pci_ctrl->last_busno = 0xff;
+ bus = pci_scan_bus(pci_ctrl->first_busno, pci_ctrl->ops,
+ pci_ctrl);
+ if (pci_ctrl->io_resource.flags) {
+ unsigned long offs;
+
+ offs = (unsigned long)pci_ctrl->io_space.base;
+ pci_ctrl->io_resource.start += offs;
+ pci_ctrl->io_resource.end += offs;
+ bus->resource[0] = &pci_ctrl->io_resource;
+ }
+ for (i = 0; i < 3; ++i)
+ if (pci_ctrl->mem_resources[i].flags)
+ bus->resource[i+1] =&pci_ctrl->mem_resources[i];
+ pci_ctrl->bus = bus;
+ pci_ctrl->last_busno = bus->subordinate;
+ if (next_busno <= pci_ctrl->last_busno)
+ next_busno = pci_ctrl->last_busno+1;
+ }
+ pci_bus_count = next_busno;
+
+ return platform_pcibios_fixup();
+}
+
+subsys_initcall(pcibios_init);
+
+void __init pcibios_fixup_bus(struct pci_bus *bus)
+{
+ struct pci_controller *pci_ctrl = bus->sysdata;
+ struct resource *res;
+ unsigned long io_offset;
+ int i;
+
+ io_offset = (unsigned long)pci_ctrl->io_space.base;
+ if (bus->parent == NULL) {
+ /* this is a host bridge - fill in its resources */
+ pci_ctrl->bus = bus;
+
+ bus->resource[0] = res = &pci_ctrl->io_resource;
+ if (!res->flags) {
+ if (io_offset)
+ printk (KERN_ERR "I/O resource not set for host"
+ " bridge %d\n", pci_ctrl->index);
+ res->start = 0;
+ res->end = IO_SPACE_LIMIT;
+ res->flags = IORESOURCE_IO;
+ }
+ res->start += io_offset;
+ res->end += io_offset;
+
+ for (i = 0; i < 3; i++) {
+ res = &pci_ctrl->mem_resources[i];
+ if (!res->flags) {
+ if (i > 0)
+ continue;
+ printk(KERN_ERR "Memory resource not set for "
+ "host bridge %d\n", pci_ctrl->index);
+ res->start = 0;
+ res->end = ~0U;
+ res->flags = IORESOURCE_MEM;
+ }
+ bus->resource[i+1] = res;
+ }
+ } else {
+ /* This is a subordinate bridge */
+ pci_read_bridge_bases(bus);
+
+ for (i = 0; i < 4; i++) {
+ if ((res = bus->resource[i]) == NULL || !res->flags)
+ continue;
+ if (io_offset && (res->flags & IORESOURCE_IO)) {
+ res->start += io_offset;
+ res->end += io_offset;
+ }
+ }
+ }
+}
+
+char __init *pcibios_setup(char *str)
+{
+ return str;
+}
+
+/* the next one is stolen from the alpha port... */
+
+void __init
+pcibios_update_irq(struct pci_dev *dev, int irq)
+{
+ pci_write_config_byte(dev, PCI_INTERRUPT_LINE, irq);
+}
+
+int pcibios_enable_device(struct pci_dev *dev, int mask)
+{
+ u16 cmd, old_cmd;
+ int idx;
+ struct resource *r;
+
+ pci_read_config_word(dev, PCI_COMMAND, &cmd);
+ old_cmd = cmd;
+ for (idx=0; idx<6; idx++) {
+ r = &dev->resource[idx];
+ if (!r->start && r->end) {
+ printk(KERN_ERR "PCI: Device %s not available because "
+ "of resource collisions\n", dev->slot_name);
+ return -EINVAL;
+ }
+ if (r->flags & IORESOURCE_IO)
+ cmd |= PCI_COMMAND_IO;
+ if (r->flags & IORESOURCE_MEM)
+ cmd |= PCI_COMMAND_MEMORY;
+ }
+ if (cmd != old_cmd) {
+ printk("PCI: Enabling device %s (%04x -> %04x)\n",
+ dev->slot_name, old_cmd, cmd);
+ pci_write_config_word(dev, PCI_COMMAND, cmd);
+ }
+
+ return 0;
+}
+
+#ifdef CONFIG_PROC_FS
+
+/*
+ * Return the index of the PCI controller for device pdev.
+ */
+
+int
+pci_controller_num(struct pci_dev *dev)
+{
+ struct pci_controller *pci_ctrl = (struct pci_controller*) dev->sysdata;
+ return pci_ctrl->index;
+}
+
+#endif /* CONFIG_PROC_FS */
+
+
+static void
+pcibios_fixup_resources(struct pci_dev *dev)
+{
+ struct pci_controller* pci_ctrl = (struct pci_controller *)dev->sysdata;
+ int i;
+ unsigned long offset;
+
+ if (!pci_ctrl) {
+ printk(KERN_ERR "No pci_ctrl for PCI dev %s!\n",dev->slot_name);
+ return;
+ }
+ for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
+ struct resource *res = dev->resource + i;
+ if (!res->start || !res->flags)
+ continue;
+ if (res->end == 0xffffffff) {
+ DBG("PCI:%s Resource %d [%08lx-%08lx] is unassigned\n",
+ dev->slot_name, i, res->start, res->end);
+ res->end -= res->start;
+ res->start = 0;
+ continue;
+ }
+ offset = 0;
+ if (res->flags & IORESOURCE_IO)
+ offset = (unsigned long) pci_ctrl->io_space.base;
+ else if (res->flags & IORESOURCE_MEM)
+ offset = (unsigned long) pci_ctrl->mem_space.base;
+
+ if (offset != 0) {
+ res->start += offset;
+ res->end += offset;
+#ifdef DEBUG
+ printk("Fixup res %d (%lx) of dev %s: %lx -> %lx\n",
+ i, res->flags, dev->slot_name,
+ res->start - offset, res->start);
+#endif
+ }
+ }
+}
+
+/*
+ * Platform support for /proc/bus/pci/X/Y mmap()s,
+ * modelled on the sparc64 implementation by Dave Miller.
+ * -- paulus.
+ */
+
+/*
+ * Adjust vm_pgoff of VMA such that it is the physical page offset
+ * corresponding to the 32-bit pci bus offset for DEV requested by the user.
+ *
+ * Basically, the user finds the base address for his device which he wishes
+ * to mmap. They read the 32-bit value from the config space base register,
+ * add whatever PAGE_SIZE multiple offset they wish, and feed this into the
+ * offset parameter of mmap on /proc/bus/pci/XXX for that device.
+ *
+ * Returns negative error code on failure, zero on success.
+ */
+static __inline__ int
+__pci_mmap_make_offset(struct pci_dev *dev, struct vm_area_struct *vma,
+ enum pci_mmap_state mmap_state)
+{
+ struct pci_controller *pci_ctrl = (struct pci_controller*) dev->sysdata;
+ unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
+ unsigned long io_offset = 0;
+ int i, res_bit;
+
+ if (pci_ctrl == 0)
+ return -EINVAL; /* should never happen */
+
+ /* If memory, add on the PCI bridge address offset */
+ if (mmap_state == pci_mmap_mem) {
+ res_bit = IORESOURCE_MEM;
+ } else {
+ io_offset = (unsigned long)pci_ctrl->io_space.base;
+ offset += io_offset;
+ res_bit = IORESOURCE_IO;
+ }
+
+ /*
+ * Check that the offset requested corresponds to one of the
+ * resources of the device.
+ */
+ for (i = 0; i <= PCI_ROM_RESOURCE; i++) {
+ struct resource *rp = &dev->resource[i];
+ int flags = rp->flags;
+
+ /* treat ROM as memory (should be already) */
+ if (i == PCI_ROM_RESOURCE)
+ flags |= IORESOURCE_MEM;
+
+ /* Active and same type? */
+ if ((flags & res_bit) == 0)
+ continue;
+
+ /* In the range of this resource? */
+ if (offset < (rp->start & PAGE_MASK) || offset > rp->end)
+ continue;
+
+ /* found it! construct the final physical address */
+ if (mmap_state == pci_mmap_io)
+ offset += pci_ctrl->io_space.start - io_offset;
+ vma->vm_pgoff = offset >> PAGE_SHIFT;
+ return 0;
+ }
+
+ return -EINVAL;
+}
+
+/*
+ * Set vm_flags of VMA, as appropriate for this architecture, for a pci device
+ * mapping.
+ */
+static __inline__ void
+__pci_mmap_set_flags(struct pci_dev *dev, struct vm_area_struct *vma,
+ enum pci_mmap_state mmap_state)
+{
+ vma->vm_flags |= VM_SHM | VM_LOCKED | VM_IO;
+}
+
+/*
+ * Set vm_page_prot of VMA, as appropriate for this architecture, for a pci
+ * device mapping.
+ */
+static __inline__ void
+__pci_mmap_set_pgprot(struct pci_dev *dev, struct vm_area_struct *vma,
+ enum pci_mmap_state mmap_state, int write_combine)
+{
+ int prot = pgprot_val(vma->vm_page_prot);
+
+ /* Set to write-through */
+ prot &= ~_PAGE_NO_CACHE;
+#if 0
+ if (!write_combine)
+ prot |= _PAGE_WRITETHRU;
+#endif
+ vma->vm_page_prot = __pgprot(prot);
+}
+
+/*
+ * Perform the actual remap of the pages for a PCI device mapping, as
+ * appropriate for this architecture. The region in the process to map
+ * is described by vm_start and vm_end members of VMA, the base physical
+ * address is found in vm_pgoff.
+ * The pci device structure is provided so that architectures may make mapping
+ * decisions on a per-device or per-bus basis.
+ *
+ * Returns a negative error code on failure, zero on success.
+ */
+int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
+ enum pci_mmap_state mmap_state,
+ int write_combine)
+{
+ int ret;
+
+ ret = __pci_mmap_make_offset(dev, vma, mmap_state);
+ if (ret < 0)
+ return ret;
+
+ __pci_mmap_set_flags(dev, vma, mmap_state);
+ __pci_mmap_set_pgprot(dev, vma, mmap_state, write_combine);
+
+ ret = io_remap_page_range(vma, vma->vm_start, vma->vm_pgoff<<PAGE_SHIFT,
+ vma->vm_end - vma->vm_start, vma->vm_page_prot);
+
+ return ret;
+}
+
+/*
+ * This probably belongs here rather than ioport.c because
+ * we do not want this crud linked into SBus kernels.
+ * Also, think for a moment about likes of floppy.c that
+ * include architecture specific parts. They may want to redefine ins/outs.
+ *
+ * We do not use horroble macroses here because we want to
+ * advance pointer by sizeof(size).
+ */
+void outsb(unsigned long addr, const void *src, unsigned long count) {
+ while (count) {
+ count -= 1;
+ writeb(*(const char *)src, addr);
+ src += 1;
+ addr += 1;
+ }
+}
+
+void outsw(unsigned long addr, const void *src, unsigned long count) {
+ while (count) {
+ count -= 2;
+ writew(*(const short *)src, addr);
+ src += 2;
+ addr += 2;
+ }
+}
+
+void outsl(unsigned long addr, const void *src, unsigned long count) {
+ while (count) {
+ count -= 4;
+ writel(*(const long *)src, addr);
+ src += 4;
+ addr += 4;
+ }
+}
+
+void insb(unsigned long addr, void *dst, unsigned long count) {
+ while (count) {
+ count -= 1;
+ *(unsigned char *)dst = readb(addr);
+ dst += 1;
+ addr += 1;
+ }
+}
+
+void insw(unsigned long addr, void *dst, unsigned long count) {
+ while (count) {
+ count -= 2;
+ *(unsigned short *)dst = readw(addr);
+ dst += 2;
+ addr += 2;
+ }
+}
+
+void insl(unsigned long addr, void *dst, unsigned long count) {
+ while (count) {
+ count -= 4;
+ /*
+ * XXX I am sure we are in for an unaligned trap here.
+ */
+ *(unsigned long *)dst = readl(addr);
+ dst += 4;
+ addr += 4;
+ }
+}
+
+
+
--- /dev/null
+/*
+ * arch/xtensa/kernel/platform.c
+ *
+ * Default platform functions.
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2005 Tensilica Inc.
+ *
+ * Chris Zankel <chris@zankel.net>
+ */
+
+#include <linux/config.h>
+#include <linux/types.h>
+#include <linux/pci.h>
+#include <linux/time.h>
+#include <asm/platform.h>
+#include <asm/timex.h>
+
+#define _F(r,f,a,b) \
+ r __platform_##f a b; \
+ r platform_##f a __attribute__((weak, alias("__platform_"#f)))
+
+/*
+ * Default functions that are used if no platform specific function is defined.
+ * (Please, refer to include/asm-xtensa/platform.h for more information)
+ */
+
+_F(void, setup, (char** cmd), { });
+_F(void, init_irq, (void), { });
+_F(void, restart, (void), { while(1); });
+_F(void, halt, (void), { while(1); });
+_F(void, power_off, (void), { while(1); });
+_F(void, idle, (void), { __asm__ __volatile__ ("waiti 0" ::: "memory"); });
+_F(void, heartbeat, (void), { });
+_F(int, pcibios_fixup, (void), { return 0; });
+_F(int, get_rtc_time, (time_t* t), { return 0; });
+_F(int, set_rtc_time, (time_t t), { return 0; });
+
+#if CONFIG_XTENSA_CALIBRATE_CCOUNT
+_F(void, calibrate_ccount, (void),
+{
+ printk ("ERROR: Cannot calibrate cpu frequency! Assuming 100MHz.\n");
+ ccount_per_jiffy = 100 * (1000000UL/HZ);
+});
+#endif
+
--- /dev/null
+// TODO verify coprocessor handling
+/*
+ * arch/xtensa/kernel/process.c
+ *
+ * Xtensa Processor version.
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2001 - 2005 Tensilica Inc.
+ *
+ * Joe Taylor <joe@tensilica.com, joetylr@yahoo.com>
+ * Chris Zankel <chris@zankel.net>
+ * Marc Gauthier <marc@tensilica.com, marc@alumni.uwaterloo.ca>
+ * Kevin Chea
+ */
+
+#include <linux/config.h>
+#include <linux/errno.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/smp.h>
+#include <linux/smp_lock.h>
+#include <linux/stddef.h>
+#include <linux/unistd.h>
+#include <linux/ptrace.h>
+#include <linux/slab.h>
+#include <linux/elf.h>
+#include <linux/init.h>
+#include <linux/prctl.h>
+#include <linux/init_task.h>
+#include <linux/module.h>
+#include <linux/mqueue.h>
+
+#include <asm/pgtable.h>
+#include <asm/uaccess.h>
+#include <asm/system.h>
+#include <asm/io.h>
+#include <asm/processor.h>
+#include <asm/platform.h>
+#include <asm/mmu.h>
+#include <asm/irq.h>
+#include <asm/atomic.h>
+#include <asm/offsets.h>
+#include <asm/coprocessor.h>
+
+extern void ret_from_fork(void);
+
+static struct fs_struct init_fs = INIT_FS;
+static struct files_struct init_files = INIT_FILES;
+static struct signal_struct init_signals = INIT_SIGNALS(init_signals);
+static struct sighand_struct init_sighand = INIT_SIGHAND(init_sighand);
+struct mm_struct init_mm = INIT_MM(init_mm);
+EXPORT_SYMBOL(init_mm);
+
+union thread_union init_thread_union
+ __attribute__((__section__(".data.init_task"))) =
+{ INIT_THREAD_INFO(init_task) };
+
+struct task_struct init_task = INIT_TASK(init_task);
+EXPORT_SYMBOL(init_task);
+
+struct task_struct *current_set[NR_CPUS] = {&init_task, };
+
+
+#if XCHAL_CP_NUM > 0
+
+/*
+ * Coprocessor ownership.
+ */
+
+coprocessor_info_t coprocessor_info[] = {
+ { 0, XTENSA_CPE_CP0_OFFSET },
+ { 0, XTENSA_CPE_CP1_OFFSET },
+ { 0, XTENSA_CPE_CP2_OFFSET },
+ { 0, XTENSA_CPE_CP3_OFFSET },
+ { 0, XTENSA_CPE_CP4_OFFSET },
+ { 0, XTENSA_CPE_CP5_OFFSET },
+ { 0, XTENSA_CPE_CP6_OFFSET },
+ { 0, XTENSA_CPE_CP7_OFFSET },
+};
+
+#endif
+
+/*
+ * Powermanagement idle function, if any is provided by the platform.
+ */
+
+void cpu_idle(void)
+{
+ local_irq_enable();
+
+ /* endless idle loop with no priority at all */
+ while (1) {
+ while (!need_resched())
+ platform_idle();
+ preempt_enable();
+ schedule();
+ }
+}
+
+/*
+ * Free current thread data structures etc..
+ */
+
+void exit_thread(void)
+{
+ release_coprocessors(current); /* Empty macro if no CPs are defined */
+}
+
+void flush_thread(void)
+{
+ release_coprocessors(current); /* Empty macro if no CPs are defined */
+}
+
+/*
+ * Copy thread.
+ *
+ * The stack layout for the new thread looks like this:
+ *
+ * +------------------------+ <- sp in childregs (= tos)
+ * | childregs |
+ * +------------------------+ <- thread.sp = sp in dummy-frame
+ * | dummy-frame | (saved in dummy-frame spill-area)
+ * +------------------------+
+ *
+ * We create a dummy frame to return to ret_from_fork:
+ * a0 points to ret_from_fork (simulating a call4)
+ * sp points to itself (thread.sp)
+ * a2, a3 are unused.
+ *
+ * Note: This is a pristine frame, so we don't need any spill region on top of
+ * childregs.
+ */
+
+int copy_thread(int nr, unsigned long clone_flags, unsigned long usp,
+ unsigned long unused,
+ struct task_struct * p, struct pt_regs * regs)
+{
+ struct pt_regs *childregs;
+ unsigned long tos;
+ int user_mode = user_mode(regs);
+
+ /* Set up new TSS. */
+ tos = (unsigned long)p->thread_info + THREAD_SIZE;
+ if (user_mode)
+ childregs = (struct pt_regs*)(tos - PT_USER_SIZE);
+ else
+ childregs = (struct pt_regs*)tos - 1;
+
+ *childregs = *regs;
+
+ /* Create a call4 dummy-frame: a0 = 0, a1 = childregs. */
+ *((int*)childregs - 3) = (unsigned long)childregs;
+ *((int*)childregs - 4) = 0;
+
+ childregs->areg[1] = tos;
+ childregs->areg[2] = 0;
+ p->set_child_tid = p->clear_child_tid = NULL;
+ p->thread.ra = MAKE_RA_FOR_CALL((unsigned long)ret_from_fork, 0x1);
+ p->thread.sp = (unsigned long)childregs;
+ if (user_mode(regs)) {
+
+ int len = childregs->wmask & ~0xf;
+ childregs->areg[1] = usp;
+ memcpy(&childregs->areg[XCHAL_NUM_AREGS - len/4],
+ ®s->areg[XCHAL_NUM_AREGS - len/4], len);
+
+ if (clone_flags & CLONE_SETTLS)
+ childregs->areg[2] = childregs->areg[6];
+
+ } else {
+ /* In kernel space, we start a new thread with a new stack. */
+ childregs->wmask = 1;
+ }
+ return 0;
+}
+
+
+/*
+ * Create a kernel thread
+ */
+
+int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
+{
+ long retval;
+ __asm__ __volatile__
+ ("mov a5, %4\n\t" /* preserve fn in a5 */
+ "mov a6, %3\n\t" /* preserve and setup arg in a6 */
+ "movi a2, %1\n\t" /* load __NR_clone for syscall*/
+ "mov a3, sp\n\t" /* sp check and sys_clone */
+ "mov a4, %5\n\t" /* load flags for syscall */
+ "syscall\n\t"
+ "beq a3, sp, 1f\n\t" /* branch if parent */
+ "callx4 a5\n\t" /* call fn */
+ "movi a2, %2\n\t" /* load __NR_exit for syscall */
+ "mov a3, a6\n\t" /* load fn return value */
+ "syscall\n"
+ "1:\n\t"
+ "mov %0, a2\n\t" /* parent returns zero */
+ :"=r" (retval)
+ :"i" (__NR_clone), "i" (__NR_exit),
+ "r" (arg), "r" (fn),
+ "r" (flags | CLONE_VM)
+ : "a2", "a3", "a4", "a5", "a6" );
+ return retval;
+}
+
+
+/*
+ * These bracket the sleeping functions..
+ */
+
+unsigned long get_wchan(struct task_struct *p)
+{
+ unsigned long sp, pc;
+ unsigned long stack_page = (unsigned long) p->thread_info;
+ int count = 0;
+
+ if (!p || p == current || p->state == TASK_RUNNING)
+ return 0;
+
+ sp = p->thread.sp;
+ pc = MAKE_PC_FROM_RA(p->thread.ra, p->thread.sp);
+
+ do {
+ if (sp < stack_page + sizeof(struct task_struct) ||
+ sp >= (stack_page + THREAD_SIZE) ||
+ pc == 0)
+ return 0;
+ if (!in_sched_functions(pc))
+ return pc;
+
+ /* Stack layout: sp-4: ra, sp-3: sp' */
+
+ pc = MAKE_PC_FROM_RA(*(unsigned long*)sp - 4, sp);
+ sp = *(unsigned long *)sp - 3;
+ } while (count++ < 16);
+ return 0;
+}
+
+/*
+ * do_copy_regs() gathers information from 'struct pt_regs' and
+ * 'current->thread.areg[]' to fill in the xtensa_gregset_t
+ * structure.
+ *
+ * xtensa_gregset_t and 'struct pt_regs' are vastly different formats
+ * of processor registers. Besides different ordering,
+ * xtensa_gregset_t contains non-live register information that
+ * 'struct pt_regs' does not. Exception handling (primarily) uses
+ * 'struct pt_regs'. Core files and ptrace use xtensa_gregset_t.
+ *
+ */
+
+void do_copy_regs (xtensa_gregset_t *elfregs, struct pt_regs *regs,
+ struct task_struct *tsk)
+{
+ int i, n, wb_offset;
+
+ elfregs->xchal_config_id0 = XCHAL_HW_CONFIGID0;
+ elfregs->xchal_config_id1 = XCHAL_HW_CONFIGID1;
+
+ __asm__ __volatile__ ("rsr %0, 176\n" : "=a" (i));
+ elfregs->cpux = i;
+ __asm__ __volatile__ ("rsr %0, 208\n" : "=a" (i));
+ elfregs->cpuy = i;
+
+ /* Note: PS.EXCM is not set while user task is running; its
+ * being set in regs->ps is for exception handling convenience.
+ */
+
+ elfregs->pc = regs->pc;
+ elfregs->ps = (regs->ps & ~XCHAL_PS_EXCM_MASK);
+ elfregs->exccause = regs->exccause;
+ elfregs->excvaddr = regs->excvaddr;
+ elfregs->windowbase = regs->windowbase;
+ elfregs->windowstart = regs->windowstart;
+ elfregs->lbeg = regs->lbeg;
+ elfregs->lend = regs->lend;
+ elfregs->lcount = regs->lcount;
+ elfregs->sar = regs->sar;
+ elfregs->syscall = regs->syscall;
+
+ /* Copy register file.
+ * The layout looks like this:
+ *
+ * | a0 ... a15 | Z ... Z | arX ... arY |
+ * current window unused saved frames
+ */
+
+ memset (elfregs->ar, 0, sizeof(elfregs->ar));
+
+ wb_offset = regs->windowbase * 4;
+ n = (regs->wmask&1)? 4 : (regs->wmask&2)? 8 : (regs->wmask&4)? 12 : 16;
+
+ for (i = 0; i < n; i++)
+ elfregs->ar[(wb_offset + i) % XCHAL_NUM_AREGS] = regs->areg[i];
+
+ n = (regs->wmask >> 4) * 4;
+
+ for (i = XCHAL_NUM_AREGS - n; n > 0; i++, n--)
+ elfregs->ar[(wb_offset + i) % XCHAL_NUM_AREGS] = regs->areg[i];
+}
+
+void xtensa_elf_core_copy_regs (xtensa_gregset_t *elfregs, struct pt_regs *regs)
+{
+ do_copy_regs ((xtensa_gregset_t *)elfregs, regs, current);
+}
+
+
+/* The inverse of do_copy_regs(). No error or sanity checking. */
+
+void do_restore_regs (xtensa_gregset_t *elfregs, struct pt_regs *regs,
+ struct task_struct *tsk)
+{
+ int i, n, wb_offset;
+
+ /* Note: PS.EXCM is not set while user task is running; it
+ * needs to be set in regs->ps is for exception handling convenience.
+ */
+
+ regs->pc = elfregs->pc;
+ regs->ps = (elfregs->ps | XCHAL_PS_EXCM_MASK);
+ regs->exccause = elfregs->exccause;
+ regs->excvaddr = elfregs->excvaddr;
+ regs->windowbase = elfregs->windowbase;
+ regs->windowstart = elfregs->windowstart;
+ regs->lbeg = elfregs->lbeg;
+ regs->lend = elfregs->lend;
+ regs->lcount = elfregs->lcount;
+ regs->sar = elfregs->sar;
+ regs->syscall = elfregs->syscall;
+
+ /* Clear everything. */
+
+ memset (regs->areg, 0, sizeof(regs->areg));
+
+ /* Copy regs from live window frame. */
+
+ wb_offset = regs->windowbase * 4;
+ n = (regs->wmask&1)? 4 : (regs->wmask&2)? 8 : (regs->wmask&4)? 12 : 16;
+
+ for (i = 0; i < n; i++)
+ regs->areg[(wb_offset+i) % XCHAL_NUM_AREGS] = elfregs->ar[i];
+
+ n = (regs->wmask >> 4) * 4;
+
+ for (i = XCHAL_NUM_AREGS - n; n > 0; i++, n--)
+ regs->areg[(wb_offset+i) % XCHAL_NUM_AREGS] = elfregs->ar[i];
+}
+
+/*
+ * do_save_fpregs() gathers information from 'struct pt_regs' and
+ * 'current->thread' to fill in the elf_fpregset_t structure.
+ *
+ * Core files and ptrace use elf_fpregset_t.
+ */
+
+void do_save_fpregs (elf_fpregset_t *fpregs, struct pt_regs *regs,
+ struct task_struct *tsk)
+{
+#if XCHAL_HAVE_CP
+
+ extern unsigned char _xtensa_reginfo_tables[];
+ extern unsigned _xtensa_reginfo_table_size;
+ int i;
+ unsigned long flags;
+
+ /* Before dumping coprocessor state from memory,
+ * ensure any live coprocessor contents for this
+ * task are first saved to memory:
+ */
+ local_irq_save(flags);
+
+ for (i = 0; i < XCHAL_CP_MAX; i++) {
+ if (tsk == coprocessor_info[i].owner) {
+ enable_coprocessor(i);
+ save_coprocessor_registers(
+ tsk->thread.cp_save+coprocessor_info[i].offset,i);
+ disable_coprocessor(i);
+ }
+ }
+
+ local_irq_restore(flags);
+
+ /* Now dump coprocessor & extra state: */
+ memcpy((unsigned char*)fpregs,
+ _xtensa_reginfo_tables, _xtensa_reginfo_table_size);
+ memcpy((unsigned char*)fpregs + _xtensa_reginfo_table_size,
+ tsk->thread.cp_save, XTENSA_CP_EXTRA_SIZE);
+#endif
+}
+
+/*
+ * The inverse of do_save_fpregs().
+ * Copies coprocessor and extra state from fpregs into regs and tsk->thread.
+ * Returns 0 on success, non-zero if layout doesn't match.
+ */
+
+int do_restore_fpregs (elf_fpregset_t *fpregs, struct pt_regs *regs,
+ struct task_struct *tsk)
+{
+#if XCHAL_HAVE_CP
+
+ extern unsigned char _xtensa_reginfo_tables[];
+ extern unsigned _xtensa_reginfo_table_size;
+ int i;
+ unsigned long flags;
+
+ /* Make sure save area layouts match.
+ * FIXME: in the future we could allow restoring from
+ * a different layout of the same registers, by comparing
+ * fpregs' table with _xtensa_reginfo_tables and matching
+ * entries and copying registers one at a time.
+ * Not too sure yet whether that's very useful.
+ */
+
+ if( memcmp((unsigned char*)fpregs,
+ _xtensa_reginfo_tables, _xtensa_reginfo_table_size) ) {
+ return -1;
+ }
+
+ /* Before restoring coprocessor state from memory,
+ * ensure any live coprocessor contents for this
+ * task are first invalidated.
+ */
+
+ local_irq_save(flags);
+
+ for (i = 0; i < XCHAL_CP_MAX; i++) {
+ if (tsk == coprocessor_info[i].owner) {
+ enable_coprocessor(i);
+ save_coprocessor_registers(
+ tsk->thread.cp_save+coprocessor_info[i].offset,i);
+ coprocessor_info[i].owner = 0;
+ disable_coprocessor(i);
+ }
+ }
+
+ local_irq_restore(flags);
+
+ /* Now restore coprocessor & extra state: */
+
+ memcpy(tsk->thread.cp_save,
+ (unsigned char*)fpregs + _xtensa_reginfo_table_size,
+ XTENSA_CP_EXTRA_SIZE);
+#endif
+ return 0;
+}
+/*
+ * Fill in the CP structure for a core dump for a particular task.
+ */
+
+int
+dump_task_fpu(struct pt_regs *regs, struct task_struct *task, elf_fpregset_t *r)
+{
+/* see asm/coprocessor.h for this magic number 16 */
+#if TOTAL_CPEXTRA_SIZE > 16
+ do_save_fpregs (r, regs, task);
+
+ /* For now, bit 16 means some extra state may be present: */
+// FIXME!! need to track to return more accurate mask
+ return 0x10000 | XCHAL_CP_MASK;
+#else
+ return 0; /* no coprocessors active on this processor */
+#endif
+}
+
+/*
+ * Fill in the CP structure for a core dump.
+ * This includes any FPU coprocessor.
+ * Here, we dump all coprocessors, and other ("extra") custom state.
+ *
+ * This function is called by elf_core_dump() in fs/binfmt_elf.c
+ * (in which case 'regs' comes from calls to do_coredump, see signals.c).
+ */
+int dump_fpu(struct pt_regs *regs, elf_fpregset_t *r)
+{
+ return dump_task_fpu(regs, current, r);
+}
--- /dev/null
+// TODO some minor issues
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2001 - 2005 Tensilica Inc.
+ *
+ * Joe Taylor <joe@tensilica.com, joetylr@yahoo.com>
+ * Chris Zankel <chris@zankel.net>
+ * Scott Foehner<sfoehner@yahoo.com>,
+ * Kevin Chea
+ * Marc Gauthier<marc@tensilica.com> <marc@alumni.uwaterloo.ca>
+ */
+
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/mm.h>
+#include <linux/errno.h>
+#include <linux/ptrace.h>
+#include <linux/smp.h>
+#include <linux/smp_lock.h>
+#include <linux/security.h>
+
+#include <asm/pgtable.h>
+#include <asm/page.h>
+#include <asm/system.h>
+#include <asm/uaccess.h>
+#include <asm/ptrace.h>
+#include <asm/elf.h>
+
+#define TEST_KERNEL // verify kernel operations FIXME: remove
+
+
+/*
+ * Called by kernel/ptrace.c when detaching..
+ *
+ * Make sure single step bits etc are not set.
+ */
+
+void ptrace_disable(struct task_struct *child)
+{
+ /* Nothing to do.. */
+}
+
+int sys_ptrace(long request, long pid, long addr, long data)
+{
+ struct task_struct *child;
+ int ret = -EPERM;
+
+ lock_kernel();
+
+#if 0
+ if ((int)request != 1)
+ printk("ptrace(r=%d,pid=%d,addr=%08lx,data=%08lx)\n",
+ (int) request, (int) pid, (unsigned long) addr,
+ (unsigned long) data);
+#endif
+
+ if (request == PTRACE_TRACEME) {
+
+ /* Are we already being traced? */
+
+ if (current->ptrace & PT_PTRACED)
+ goto out;
+
+ if ((ret = security_ptrace(current->parent, current)))
+ goto out;
+
+ /* Set the ptrace bit in the process flags. */
+
+ current->ptrace |= PT_PTRACED;
+ ret = 0;
+ goto out;
+ }
+
+ ret = -ESRCH;
+ read_lock(&tasklist_lock);
+ child = find_task_by_pid(pid);
+ if (child)
+ get_task_struct(child);
+ read_unlock(&tasklist_lock);
+ if (!child)
+ goto out;
+
+ ret = -EPERM;
+ if (pid == 1) /* you may not mess with init */
+ goto out;
+
+ if (request == PTRACE_ATTACH) {
+ ret = ptrace_attach(child);
+ goto out_tsk;
+ }
+
+ if ((ret = ptrace_check_attach(child, request == PTRACE_KILL)) < 0)
+ goto out_tsk;
+
+ switch (request) {
+ case PTRACE_PEEKTEXT: /* read word at location addr. */
+ case PTRACE_PEEKDATA:
+ {
+ unsigned long tmp;
+ int copied;
+
+ copied = access_process_vm(child, addr, &tmp, sizeof(tmp), 0);
+ ret = -EIO;
+ if (copied != sizeof(tmp))
+ break;
+ ret = put_user(tmp,(unsigned long *) data);
+
+ goto out;
+ }
+
+ /* Read the word at location addr in the USER area. */
+
+ case PTRACE_PEEKUSR:
+ {
+ struct pt_regs *regs;
+ unsigned long tmp;
+
+ regs = xtensa_pt_regs(child);
+ tmp = 0; /* Default return value. */
+
+ switch(addr) {
+
+ case REG_AR_BASE ... REG_AR_BASE + XCHAL_NUM_AREGS - 1:
+ {
+ int ar = addr - REG_AR_BASE - regs->windowbase * 4;
+ ar &= (XCHAL_NUM_AREGS - 1);
+ if (ar < 16 && ar + (regs->wmask >> 4) * 4 >= 0)
+ tmp = regs->areg[ar];
+ else
+ ret = -EIO;
+ break;
+ }
+ case REG_A_BASE ... REG_A_BASE + 15:
+ tmp = regs->areg[addr - REG_A_BASE];
+ break;
+ case REG_PC:
+ tmp = regs->pc;
+ break;
+ case REG_PS:
+ /* Note: PS.EXCM is not set while user task is running;
+ * its being set in regs is for exception handling
+ * convenience. */
+ tmp = (regs->ps & ~XCHAL_PS_EXCM_MASK);
+ break;
+ case REG_WB:
+ tmp = regs->windowbase;
+ break;
+ case REG_WS:
+ tmp = regs->windowstart;
+ break;
+ case REG_LBEG:
+ tmp = regs->lbeg;
+ break;
+ case REG_LEND:
+ tmp = regs->lend;
+ break;
+ case REG_LCOUNT:
+ tmp = regs->lcount;
+ break;
+ case REG_SAR:
+ tmp = regs->sar;
+ break;
+ case REG_DEPC:
+ tmp = regs->depc;
+ break;
+ case REG_EXCCAUSE:
+ tmp = regs->exccause;
+ break;
+ case REG_EXCVADDR:
+ tmp = regs->excvaddr;
+ break;
+ case SYSCALL_NR:
+ tmp = regs->syscall;
+ break;
+ default:
+ tmp = 0;
+ ret = -EIO;
+ goto out;
+ }
+ ret = put_user(tmp, (unsigned long *) data);
+ goto out;
+ }
+
+ case PTRACE_POKETEXT: /* write the word at location addr. */
+ case PTRACE_POKEDATA:
+ if (access_process_vm(child, addr, &data, sizeof(data), 1)
+ == sizeof(data))
+ break;
+ ret = -EIO;
+ goto out;
+
+ case PTRACE_POKEUSR:
+ {
+ struct pt_regs *regs;
+ regs = xtensa_pt_regs(child);
+
+ switch (addr) {
+ case REG_AR_BASE ... REG_AR_BASE + XCHAL_NUM_AREGS - 1:
+ {
+ int ar = addr - REG_AR_BASE - regs->windowbase * 4;
+ if (ar < 16 && ar + (regs->wmask >> 4) * 4 >= 0)
+ regs->areg[ar & (XCHAL_NUM_AREGS - 1)] = data;
+ else
+ ret = -EIO;
+ break;
+ }
+ case REG_A_BASE ... REG_A_BASE + 15:
+ regs->areg[addr - REG_A_BASE] = data;
+ break;
+ case REG_PC:
+ regs->pc = data;
+ break;
+ case SYSCALL_NR:
+ regs->syscall = data;
+ break;
+#ifdef TEST_KERNEL
+ case REG_WB:
+ regs->windowbase = data;
+ break;
+ case REG_WS:
+ regs->windowstart = data;
+ break;
+#endif
+
+ default:
+ /* The rest are not allowed. */
+ ret = -EIO;
+ break;
+ }
+ break;
+ }
+
+ /* continue and stop at next (return from) syscall */
+ case PTRACE_SYSCALL:
+ case PTRACE_CONT: /* restart after signal. */
+ {
+ ret = -EIO;
+ if ((unsigned long) data > _NSIG)
+ break;
+ if (request == PTRACE_SYSCALL)
+ set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
+ else
+ clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
+ child->exit_code = data;
+ /* Make sure the single step bit is not set. */
+ child->ptrace &= ~PT_SINGLESTEP;
+ wake_up_process(child);
+ ret = 0;
+ break;
+ }
+
+ /*
+ * make the child exit. Best I can do is send it a sigkill.
+ * perhaps it should be put in the status that it wants to
+ * exit.
+ */
+ case PTRACE_KILL:
+ ret = 0;
+ if (child->state == EXIT_ZOMBIE) /* already dead */
+ break;
+ child->exit_code = SIGKILL;
+ child->ptrace &= ~PT_SINGLESTEP;
+ wake_up_process(child);
+ break;
+
+ case PTRACE_SINGLESTEP:
+ ret = -EIO;
+ if ((unsigned long) data > _NSIG)
+ break;
+ clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
+ child->ptrace |= PT_SINGLESTEP;
+ child->exit_code = data;
+ wake_up_process(child);
+ ret = 0;
+ break;
+
+ case PTRACE_GETREGS:
+ {
+ /* 'data' points to user memory in which to write.
+ * Mainly due to the non-live register values, we
+ * reformat the register values into something more
+ * standard. For convenience, we use the handy
+ * elf_gregset_t format. */
+
+ xtensa_gregset_t format;
+ struct pt_regs *regs = xtensa_pt_regs(child);
+
+ do_copy_regs (&format, regs, child);
+
+ /* Now, copy to user space nice and easy... */
+ ret = 0;
+ if (copy_to_user((void *)data, &format, sizeof(elf_gregset_t)))
+ ret = -EFAULT;
+ break;
+ }
+
+ case PTRACE_SETREGS:
+ {
+ /* 'data' points to user memory that contains the new
+ * values in the elf_gregset_t format. */
+
+ xtensa_gregset_t format;
+ struct pt_regs *regs = xtensa_pt_regs(child);
+
+ if (copy_from_user(&format,(void *)data,sizeof(elf_gregset_t))){
+ ret = -EFAULT;
+ break;
+ }
+
+ /* FIXME: Perhaps we want some sanity checks on
+ * these user-space values? See ARM version. Are
+ * debuggers a security concern? */
+
+ do_restore_regs (&format, regs, child);
+
+ ret = 0;
+ break;
+ }
+
+ case PTRACE_GETFPREGS:
+ {
+ /* 'data' points to user memory in which to write.
+ * For convenience, we use the handy
+ * elf_fpregset_t format. */
+
+ elf_fpregset_t fpregs;
+ struct pt_regs *regs = xtensa_pt_regs(child);
+
+ do_save_fpregs (&fpregs, regs, child);
+
+ /* Now, copy to user space nice and easy... */
+ ret = 0;
+ if (copy_to_user((void *)data, &fpregs, sizeof(elf_fpregset_t)))
+ ret = -EFAULT;
+
+ break;
+ }
+
+ case PTRACE_SETFPREGS:
+ {
+ /* 'data' points to user memory that contains the new
+ * values in the elf_fpregset_t format.
+ */
+ elf_fpregset_t fpregs;
+ struct pt_regs *regs = xtensa_pt_regs(child);
+
+ ret = 0;
+ if (copy_from_user(&fpregs, (void *)data, sizeof(elf_fpregset_t))) {
+ ret = -EFAULT;
+ break;
+ }
+
+ if (do_restore_fpregs (&fpregs, regs, child))
+ ret = -EIO;
+ break;
+ }
+
+ case PTRACE_GETFPREGSIZE:
+ /* 'data' points to 'unsigned long' set to the size
+ * of elf_fpregset_t
+ */
+ ret = put_user(sizeof(elf_fpregset_t), (unsigned long *) data);
+ break;
+
+ case PTRACE_DETACH: /* detach a process that was attached. */
+ ret = ptrace_detach(child, data);
+ break;
+
+ default:
+ ret = ptrace_request(child, request, addr, data);
+ goto out;
+ }
+out_tsk:
+ put_task_struct(child);
+out:
+ unlock_kernel();
+ return ret;
+}
+
+void do_syscall_trace(void)
+{
+ if (!test_thread_flag(TIF_SYSCALL_TRACE))
+ return;
+
+ if (!(current->ptrace & PT_PTRACED))
+ return;
+
+ /*
+ * The 0x80 provides a way for the tracing parent to distinguish
+ * between a syscall stop and SIGTRAP delivery
+ */
+ ptrace_notify(SIGTRAP|((current->ptrace & PT_TRACESYSGOOD) ? 0x80 : 0));
+
+ /*
+ * this isn't the same as continuing with a signal, but it will do
+ * for normal use. strace only continues with a signal if the
+ * stopping signal is not SIGTRAP. -brl
+ */
+ if (current->exit_code) {
+ send_sig(current->exit_code, current, 1);
+ current->exit_code = 0;
+ }
+}
--- /dev/null
+/*
+ * arch/xtensa/kernel/semaphore.c
+ *
+ * Generic semaphore code. Buyer beware. Do your own specific changes
+ * in <asm/semaphore-helper.h>
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2001 - 2005 Tensilica Inc.
+ *
+ * Joe Taylor <joe@tensilica.com, joetylr@yahoo.com>
+ * Chris Zankel <chris@zankel.net>
+ * Marc Gauthier<marc@tensilica.com, marc@alumni.uwaterloo.ca>
+ * Kevin Chea
+ */
+
+#include <linux/sched.h>
+#include <linux/wait.h>
+#include <linux/init.h>
+#include <asm/semaphore.h>
+#include <asm/errno.h>
+
+/*
+ * These two _must_ execute atomically wrt each other.
+ */
+
+static __inline__ void wake_one_more(struct semaphore * sem)
+{
+ atomic_inc((atomic_t *)&sem->sleepers);
+}
+
+static __inline__ int waking_non_zero(struct semaphore *sem)
+{
+ unsigned long flags;
+ int ret = 0;
+
+ spin_lock_irqsave(&semaphore_wake_lock, flags);
+ if (sem->sleepers > 0) {
+ sem->sleepers--;
+ ret = 1;
+ }
+ spin_unlock_irqrestore(&semaphore_wake_lock, flags);
+ return ret;
+}
+
+/*
+ * waking_non_zero_interruptible:
+ * 1 got the lock
+ * 0 go to sleep
+ * -EINTR interrupted
+ *
+ * We must undo the sem->count down_interruptible() increment while we are
+ * protected by the spinlock in order to make atomic this atomic_inc() with the
+ * atomic_read() in wake_one_more(), otherwise we can race. -arca
+ */
+
+static __inline__ int waking_non_zero_interruptible(struct semaphore *sem,
+ struct task_struct *tsk)
+{
+ unsigned long flags;
+ int ret = 0;
+
+ spin_lock_irqsave(&semaphore_wake_lock, flags);
+ if (sem->sleepers > 0) {
+ sem->sleepers--;
+ ret = 1;
+ } else if (signal_pending(tsk)) {
+ atomic_inc(&sem->count);
+ ret = -EINTR;
+ }
+ spin_unlock_irqrestore(&semaphore_wake_lock, flags);
+ return ret;
+}
+
+/*
+ * waking_non_zero_trylock:
+ * 1 failed to lock
+ * 0 got the lock
+ *
+ * We must undo the sem->count down_trylock() increment while we are
+ * protected by the spinlock in order to make atomic this atomic_inc() with the
+ * atomic_read() in wake_one_more(), otherwise we can race. -arca
+ */
+
+static __inline__ int waking_non_zero_trylock(struct semaphore *sem)
+{
+ unsigned long flags;
+ int ret = 1;
+
+ spin_lock_irqsave(&semaphore_wake_lock, flags);
+ if (sem->sleepers <= 0)
+ atomic_inc(&sem->count);
+ else {
+ sem->sleepers--;
+ ret = 0;
+ }
+ spin_unlock_irqrestore(&semaphore_wake_lock, flags);
+ return ret;
+}
+
+spinlock_t semaphore_wake_lock;
+
+/*
+ * Semaphores are implemented using a two-way counter:
+ * The "count" variable is decremented for each process
+ * that tries to sleep, while the "waking" variable is
+ * incremented when the "up()" code goes to wake up waiting
+ * processes.
+ *
+ * Notably, the inline "up()" and "down()" functions can
+ * efficiently test if they need to do any extra work (up
+ * needs to do something only if count was negative before
+ * the increment operation.
+ *
+ * waking_non_zero() (from asm/semaphore.h) must execute
+ * atomically.
+ *
+ * When __up() is called, the count was negative before
+ * incrementing it, and we need to wake up somebody.
+ *
+ * This routine adds one to the count of processes that need to
+ * wake up and exit. ALL waiting processes actually wake up but
+ * only the one that gets to the "waking" field first will gate
+ * through and acquire the semaphore. The others will go back
+ * to sleep.
+ *
+ * Note that these functions are only called when there is
+ * contention on the lock, and as such all this is the
+ * "non-critical" part of the whole semaphore business. The
+ * critical part is the inline stuff in <asm/semaphore.h>
+ * where we want to avoid any extra jumps and calls.
+ */
+
+void __up(struct semaphore *sem)
+{
+ wake_one_more(sem);
+ wake_up(&sem->wait);
+}
+
+/*
+ * Perform the "down" function. Return zero for semaphore acquired,
+ * return negative for signalled out of the function.
+ *
+ * If called from __down, the return is ignored and the wait loop is
+ * not interruptible. This means that a task waiting on a semaphore
+ * using "down()" cannot be killed until someone does an "up()" on
+ * the semaphore.
+ *
+ * If called from __down_interruptible, the return value gets checked
+ * upon return. If the return value is negative then the task continues
+ * with the negative value in the return register (it can be tested by
+ * the caller).
+ *
+ * Either form may be used in conjunction with "up()".
+ *
+ */
+
+#define DOWN_VAR \
+ struct task_struct *tsk = current; \
+ wait_queue_t wait; \
+ init_waitqueue_entry(&wait, tsk);
+
+#define DOWN_HEAD(task_state) \
+ \
+ \
+ tsk->state = (task_state); \
+ add_wait_queue(&sem->wait, &wait); \
+ \
+ /* \
+ * Ok, we're set up. sem->count is known to be less than zero \
+ * so we must wait. \
+ * \
+ * We can let go the lock for purposes of waiting. \
+ * We re-acquire it after awaking so as to protect \
+ * all semaphore operations. \
+ * \
+ * If "up()" is called before we call waking_non_zero() then \
+ * we will catch it right away. If it is called later then \
+ * we will have to go through a wakeup cycle to catch it. \
+ * \
+ * Multiple waiters contend for the semaphore lock to see \
+ * who gets to gate through and who has to wait some more. \
+ */ \
+ for (;;) {
+
+#define DOWN_TAIL(task_state) \
+ tsk->state = (task_state); \
+ } \
+ tsk->state = TASK_RUNNING; \
+ remove_wait_queue(&sem->wait, &wait);
+
+void __sched __down(struct semaphore * sem)
+{
+ DOWN_VAR
+ DOWN_HEAD(TASK_UNINTERRUPTIBLE)
+ if (waking_non_zero(sem))
+ break;
+ schedule();
+ DOWN_TAIL(TASK_UNINTERRUPTIBLE)
+}
+
+int __sched __down_interruptible(struct semaphore * sem)
+{
+ int ret = 0;
+ DOWN_VAR
+ DOWN_HEAD(TASK_INTERRUPTIBLE)
+
+ ret = waking_non_zero_interruptible(sem, tsk);
+ if (ret)
+ {
+ if (ret == 1)
+ /* ret != 0 only if we get interrupted -arca */
+ ret = 0;
+ break;
+ }
+ schedule();
+ DOWN_TAIL(TASK_INTERRUPTIBLE)
+ return ret;
+}
+
+int __down_trylock(struct semaphore * sem)
+{
+ return waking_non_zero_trylock(sem);
+}
--- /dev/null
+/*
+ * arch/xtensa/setup.c
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 1995 Linus Torvalds
+ * Copyright (C) 2001 - 2005 Tensilica Inc.
+ *
+ * Chris Zankel <chris@zankel.net>
+ * Joe Taylor <joe@tensilica.com, joetylr@yahoo.com>
+ * Kevin Chea
+ * Marc Gauthier<marc@tensilica.com> <marc@alumni.uwaterloo.ca>
+ */
+
+#include <linux/config.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/proc_fs.h>
+#include <linux/tty.h>
+#include <linux/bootmem.h>
+#include <linux/kernel.h>
+
+#if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
+# include <linux/console.h>
+#endif
+
+#ifdef CONFIG_RTC
+# include <linux/timex.h>
+#endif
+
+#ifdef CONFIG_PROC_FS
+# include <linux/seq_file.h>
+#endif
+
+#include <asm/system.h>
+#include <asm/bootparam.h>
+#include <asm/pgtable.h>
+#include <asm/processor.h>
+#include <asm/timex.h>
+#include <asm/platform.h>
+#include <asm/page.h>
+#include <asm/setup.h>
+
+#include <xtensa/config/system.h>
+
+#if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
+struct screen_info screen_info = { 0, 24, 0, 0, 0, 80, 0, 0, 0, 24, 1, 16};
+#endif
+
+#ifdef CONFIG_BLK_DEV_FD
+extern struct fd_ops no_fd_ops;
+struct fd_ops *fd_ops;
+#endif
+
+#if defined(CONFIG_BLK_DEV_IDE) || defined(CONFIG_BLK_DEV_IDE_MODULE)
+extern struct ide_ops no_ide_ops;
+struct ide_ops *ide_ops;
+#endif
+
+extern struct rtc_ops no_rtc_ops;
+struct rtc_ops *rtc_ops;
+
+#ifdef CONFIG_PC_KEYB
+extern struct kbd_ops no_kbd_ops;
+struct kbd_ops *kbd_ops;
+#endif
+
+#ifdef CONFIG_BLK_DEV_INITRD
+extern void *initrd_start;
+extern void *initrd_end;
+extern void *__initrd_start;
+extern void *__initrd_end;
+int initrd_is_mapped = 0;
+extern int initrd_below_start_ok;
+#endif
+
+unsigned char aux_device_present;
+extern unsigned long loops_per_jiffy;
+
+/* Command line specified as configuration option. */
+
+static char command_line[COMMAND_LINE_SIZE];
+
+#ifdef CONFIG_CMDLINE_BOOL
+static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;
+#endif
+
+sysmem_info_t __initdata sysmem;
+
+#ifdef CONFIG_BLK_DEV_INITRD
+int initrd_is_mapped;
+#endif
+
+extern void init_mmu(void);
+
+/*
+ * Boot parameter parsing.
+ *
+ * The Xtensa port uses a list of variable-sized tags to pass data to
+ * the kernel. The first tag must be a BP_TAG_FIRST tag for the list
+ * to be recognised. The list is terminated with a zero-sized
+ * BP_TAG_LAST tag.
+ */
+
+typedef struct tagtable {
+ u32 tag;
+ int (*parse)(const bp_tag_t*);
+} tagtable_t;
+
+#define __tagtable(tag, fn) static tagtable_t __tagtable_##fn \
+ __attribute__((unused, __section__(".taglist"))) = { tag, fn }
+
+/* parse current tag */
+
+static int __init parse_tag_mem(const bp_tag_t *tag)
+{
+ meminfo_t *mi = (meminfo_t*)(tag->data);
+
+ if (mi->type != MEMORY_TYPE_CONVENTIONAL)
+ return -1;
+
+ if (sysmem.nr_banks >= SYSMEM_BANKS_MAX) {
+ printk(KERN_WARNING
+ "Ignoring memory bank 0x%08lx size %ldKB\n",
+ (unsigned long)mi->start,
+ (unsigned long)mi->end - (unsigned long)mi->start);
+ return -EINVAL;
+ }
+ sysmem.bank[sysmem.nr_banks].type = mi->type;
+ sysmem.bank[sysmem.nr_banks].start = PAGE_ALIGN(mi->start);
+ sysmem.bank[sysmem.nr_banks].end = mi->end & PAGE_SIZE;
+ sysmem.nr_banks++;
+
+ return 0;
+}
+
+__tagtable(BP_TAG_MEMORY, parse_tag_mem);
+
+#ifdef CONFIG_BLK_DEV_INITRD
+
+static int __init parse_tag_initrd(const bp_tag_t* tag)
+{
+ meminfo_t* mi;
+ mi = (meminfo_t*)(tag->data);
+ initrd_start = (void*)(mi->start);
+ initrd_end = (void*)(mi->end);
+
+ return 0;
+}
+
+__tagtable(BP_TAG_INITRD, parse_tag_initrd);
+
+#endif /* CONFIG_BLK_DEV_INITRD */
+
+static int __init parse_tag_cmdline(const bp_tag_t* tag)
+{
+ strncpy(command_line, (char*)(tag->data), COMMAND_LINE_SIZE);
+ command_line[COMMAND_LINE_SIZE - 1] = '\0';
+ return 0;
+}
+
+__tagtable(BP_TAG_COMMAND_LINE, parse_tag_cmdline);
+
+static int __init parse_bootparam(const bp_tag_t* tag)
+{
+ extern tagtable_t __tagtable_begin, __tagtable_end;
+ tagtable_t *t;
+
+ /* Boot parameters must start with a BP_TAG_FIRST tag. */
+
+ if (tag->id != BP_TAG_FIRST) {
+ printk(KERN_WARNING "Invalid boot parameters!\n");
+ return 0;
+ }
+
+ tag = (bp_tag_t*)((unsigned long)tag + sizeof(bp_tag_t) + tag->size);
+
+ /* Parse all tags. */
+
+ while (tag != NULL && tag->id != BP_TAG_LAST) {
+ for (t = &__tagtable_begin; t < &__tagtable_end; t++) {
+ if (tag->id == t->tag) {
+ t->parse(tag);
+ break;
+ }
+ }
+ if (t == &__tagtable_end)
+ printk(KERN_WARNING "Ignoring tag "
+ "0x%08x\n", tag->id);
+ tag = (bp_tag_t*)((unsigned long)(tag + 1) + tag->size);
+ }
+
+ return 0;
+}
+
+/*
+ * Initialize architecture. (Early stage)
+ */
+
+void __init init_arch(bp_tag_t *bp_start)
+{
+
+#ifdef CONFIG_BLK_DEV_INITRD
+ initrd_start = &__initrd_start;
+ initrd_end = &__initrd_end;
+#endif
+
+ sysmem.nr_banks = 0;
+
+#ifdef CONFIG_CMDLINE_BOOL
+ strcpy(command_line, default_command_line);
+#endif
+
+ /* Parse boot parameters */
+
+ if (bp_start)
+ parse_bootparam(bp_start);
+
+ if (sysmem.nr_banks == 0) {
+ sysmem.nr_banks = 1;
+ sysmem.bank[0].start = PLATFORM_DEFAULT_MEM_START;
+ sysmem.bank[0].end = PLATFORM_DEFAULT_MEM_START
+ + PLATFORM_DEFAULT_MEM_SIZE;
+ }
+
+ /* Early hook for platforms */
+
+ platform_init(bp_start);
+
+ /* Initialize MMU. */
+
+ init_mmu();
+}
+
+/*
+ * Initialize system. Setup memory and reserve regions.
+ */
+
+extern char _end;
+extern char _stext;
+extern char _WindowVectors_text_start;
+extern char _WindowVectors_text_end;
+extern char _DebugInterruptVector_literal_start;
+extern char _DebugInterruptVector_text_end;
+extern char _KernelExceptionVector_literal_start;
+extern char _KernelExceptionVector_text_end;
+extern char _UserExceptionVector_literal_start;
+extern char _UserExceptionVector_text_end;
+extern char _DoubleExceptionVector_literal_start;
+extern char _DoubleExceptionVector_text_end;
+
+void __init setup_arch(char **cmdline_p)
+{
+ extern int mem_reserve(unsigned long, unsigned long, int);
+ extern void bootmem_init(void);
+
+ memcpy(saved_command_line, command_line, COMMAND_LINE_SIZE);
+ saved_command_line[COMMAND_LINE_SIZE-1] = '\0';
+ *cmdline_p = command_line;
+
+ /* Reserve some memory regions */
+
+#ifdef CONFIG_BLK_DEV_INITRD
+ if (initrd_start < initrd_end) {
+ initrd_is_mapped = mem_reserve(__pa(initrd_start),
+ __pa(initrd_end), 0);
+ initrd_below_start_ok = 1;
+ } else {
+ initrd_start = 0;
+ }
+#endif
+
+ mem_reserve(__pa(&_stext),__pa(&_end), 1);
+
+ mem_reserve(__pa(&_WindowVectors_text_start),
+ __pa(&_WindowVectors_text_end), 0);
+
+ mem_reserve(__pa(&_DebugInterruptVector_literal_start),
+ __pa(&_DebugInterruptVector_text_end), 0);
+
+ mem_reserve(__pa(&_KernelExceptionVector_literal_start),
+ __pa(&_KernelExceptionVector_text_end), 0);
+
+ mem_reserve(__pa(&_UserExceptionVector_literal_start),
+ __pa(&_UserExceptionVector_text_end), 0);
+
+ mem_reserve(__pa(&_DoubleExceptionVector_literal_start),
+ __pa(&_DoubleExceptionVector_text_end), 0);
+
+ bootmem_init();
+
+ platform_setup(cmdline_p);
+
+
+ paging_init();
+
+#ifdef CONFIG_VT
+# if defined(CONFIG_VGA_CONSOLE)
+ conswitchp = &vga_con;
+# elif defined(CONFIG_DUMMY_CONSOLE)
+ conswitchp = &dummy_con;
+# endif
+#endif
+
+#if CONFIG_PCI
+ platform_pcibios_init();
+#endif
+}
+
+void machine_restart(char * cmd)
+{
+ platform_restart();
+}
+
+void machine_halt(void)
+{
+ platform_halt();
+ while (1);
+}
+
+void machine_power_off(void)
+{
+ platform_power_off();
+ while (1);
+}
+#ifdef CONFIG_PROC_FS
+
+/*
+ * Display some core information through /proc/cpuinfo.
+ */
+
+static int
+c_show(struct seq_file *f, void *slot)
+{
+ /* high-level stuff */
+ seq_printf(f,"processor\t: 0\n"
+ "vendor_id\t: Tensilica\n"
+ "model\t\t: Xtensa " XCHAL_HW_RELEASE_NAME "\n"
+ "core ID\t\t: " XCHAL_CORE_ID "\n"
+ "build ID\t: 0x%x\n"
+ "byte order\t: %s\n"
+ "cpu MHz\t\t: %lu.%02lu\n"
+ "bogomips\t: %lu.%02lu\n",
+ XCHAL_BUILD_UNIQUE_ID,
+ XCHAL_HAVE_BE ? "big" : "little",
+ CCOUNT_PER_JIFFY/(1000000/HZ),
+ (CCOUNT_PER_JIFFY/(10000/HZ)) % 100,
+ loops_per_jiffy/(500000/HZ),
+ (loops_per_jiffy/(5000/HZ)) % 100);
+
+ seq_printf(f,"flags\t\t: "
+#if XCHAL_HAVE_NMI
+ "nmi "
+#endif
+#if XCHAL_HAVE_DEBUG
+ "debug "
+# if XCHAL_HAVE_OCD
+ "ocd "
+# endif
+#endif
+#if XCHAL_HAVE_DENSITY
+ "density "
+#endif
+#if XCHAL_HAVE_BOOLEANS
+ "boolean "
+#endif
+#if XCHAL_HAVE_LOOPS
+ "loop "
+#endif
+#if XCHAL_HAVE_NSA
+ "nsa "
+#endif
+#if XCHAL_HAVE_MINMAX
+ "minmax "
+#endif
+#if XCHAL_HAVE_SEXT
+ "sext "
+#endif
+#if XCHAL_HAVE_CLAMPS
+ "clamps "
+#endif
+#if XCHAL_HAVE_MAC16
+ "mac16 "
+#endif
+#if XCHAL_HAVE_MUL16
+ "mul16 "
+#endif
+#if XCHAL_HAVE_MUL32
+ "mul32 "
+#endif
+#if XCHAL_HAVE_MUL32_HIGH
+ "mul32h "
+#endif
+#if XCHAL_HAVE_FP
+ "fpu "
+#endif
+ "\n");
+
+ /* Registers. */
+ seq_printf(f,"physical aregs\t: %d\n"
+ "misc regs\t: %d\n"
+ "ibreak\t\t: %d\n"
+ "dbreak\t\t: %d\n",
+ XCHAL_NUM_AREGS,
+ XCHAL_NUM_MISC_REGS,
+ XCHAL_NUM_IBREAK,
+ XCHAL_NUM_DBREAK);
+
+
+ /* Interrupt. */
+ seq_printf(f,"num ints\t: %d\n"
+ "ext ints\t: %d\n"
+ "int levels\t: %d\n"
+ "timers\t\t: %d\n"
+ "debug level\t: %d\n",
+ XCHAL_NUM_INTERRUPTS,
+ XCHAL_NUM_EXTINTERRUPTS,
+ XCHAL_NUM_INTLEVELS,
+ XCHAL_NUM_TIMERS,
+ XCHAL_DEBUGLEVEL);
+
+ /* Coprocessors */
+#if XCHAL_HAVE_CP
+ seq_printf(f, "coprocessors\t: %d\n", XCHAL_CP_NUM);
+#else
+ seq_printf(f, "coprocessors\t: none\n");
+#endif
+
+ /* {I,D}{RAM,ROM} and XLMI */
+ seq_printf(f,"inst ROMs\t: %d\n"
+ "inst RAMs\t: %d\n"
+ "data ROMs\t: %d\n"
+ "data RAMs\t: %d\n"
+ "XLMI ports\t: %d\n",
+ XCHAL_NUM_IROM,
+ XCHAL_NUM_IRAM,
+ XCHAL_NUM_DROM,
+ XCHAL_NUM_DRAM,
+ XCHAL_NUM_XLMI);
+
+ /* Cache */
+ seq_printf(f,"icache line size: %d\n"
+ "icache ways\t: %d\n"
+ "icache size\t: %d\n"
+ "icache flags\t: "
+#if XCHAL_ICACHE_LINE_LOCKABLE
+ "lock"
+#endif
+ "\n"
+ "dcache line size: %d\n"
+ "dcache ways\t: %d\n"
+ "dcache size\t: %d\n"
+ "dcache flags\t: "
+#if XCHAL_DCACHE_IS_WRITEBACK
+ "writeback"
+#endif
+#if XCHAL_DCACHE_LINE_LOCKABLE
+ "lock"
+#endif
+ "\n",
+ XCHAL_ICACHE_LINESIZE,
+ XCHAL_ICACHE_WAYS,
+ XCHAL_ICACHE_SIZE,
+ XCHAL_DCACHE_LINESIZE,
+ XCHAL_DCACHE_WAYS,
+ XCHAL_DCACHE_SIZE);
+
+ /* MMU */
+ seq_printf(f,"ASID bits\t: %d\n"
+ "ASID invalid\t: %d\n"
+ "ASID kernel\t: %d\n"
+ "rings\t\t: %d\n"
+ "itlb ways\t: %d\n"
+ "itlb AR ways\t: %d\n"
+ "dtlb ways\t: %d\n"
+ "dtlb AR ways\t: %d\n",
+ XCHAL_MMU_ASID_BITS,
+ XCHAL_MMU_ASID_INVALID,
+ XCHAL_MMU_ASID_KERNEL,
+ XCHAL_MMU_RINGS,
+ XCHAL_ITLB_WAYS,
+ XCHAL_ITLB_ARF_WAYS,
+ XCHAL_DTLB_WAYS,
+ XCHAL_DTLB_ARF_WAYS);
+
+ return 0;
+}
+
+/*
+ * We show only CPU #0 info.
+ */
+static void *
+c_start(struct seq_file *f, loff_t *pos)
+{
+ return (void *) ((*pos == 0) ? (void *)1 : NULL);
+}
+
+static void *
+c_next(struct seq_file *f, void *v, loff_t *pos)
+{
+ return NULL;
+}
+
+static void
+c_stop(struct seq_file *f, void *v)
+{
+}
+
+struct seq_operations cpuinfo_op =
+{
+ start: c_start,
+ next: c_next,
+ stop: c_stop,
+ show: c_show
+};
+
+#endif /* CONFIG_PROC_FS */
+
--- /dev/null
+// TODO coprocessor stuff
+/*
+ * linux/arch/xtensa/kernel/signal.c
+ *
+ * Copyright (C) 1991, 1992 Linus Torvalds
+ * 1997-11-28 Modified for POSIX.1b signals by Richard Henderson
+ *
+ * Joe Taylor <joe@tensilica.com>
+ * Chris Zankel <chris@zankel.net>
+ *
+ *
+ *
+ */
+
+#include <xtensa/config/core.h>
+#include <xtensa/hal.h>
+#include <linux/sched.h>
+#include <linux/mm.h>
+#include <linux/smp.h>
+#include <linux/smp_lock.h>
+#include <linux/kernel.h>
+#include <linux/signal.h>
+#include <linux/errno.h>
+#include <linux/wait.h>
+#include <linux/ptrace.h>
+#include <linux/unistd.h>
+#include <linux/stddef.h>
+#include <linux/personality.h>
+#include <asm/ucontext.h>
+#include <asm/uaccess.h>
+#include <asm/pgtable.h>
+#include <asm/cacheflush.h>
+
+#define DEBUG_SIG 0
+
+#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
+
+asmlinkage long sys_wait4(pid_t pid,unsigned int * stat_addr, int options,
+ struct rusage * ru);
+asmlinkage int do_signal(struct pt_regs *regs, sigset_t *oldset);
+
+extern struct task_struct *coproc_owners[];
+
+
+/*
+ * Atomically swap in the new signal mask, and wait for a signal.
+ */
+
+int sys_sigsuspend(struct pt_regs *regs)
+{
+ old_sigset_t mask = (old_sigset_t) regs->areg[3];
+ sigset_t saveset;
+
+ mask &= _BLOCKABLE;
+ spin_lock_irq(¤t->sighand->siglock);
+ saveset = current->blocked;
+ siginitset(¤t->blocked, mask);
+ recalc_sigpending();
+ spin_unlock_irq(¤t->sighand->siglock);
+
+ regs->areg[2] = -EINTR;
+ while (1) {
+ current->state = TASK_INTERRUPTIBLE;
+ schedule();
+ if (do_signal(regs, &saveset))
+ return -EINTR;
+ }
+}
+
+asmlinkage int
+sys_rt_sigsuspend(struct pt_regs *regs)
+{
+ sigset_t *unewset = (sigset_t *) regs->areg[4];
+ size_t sigsetsize = (size_t) regs->areg[3];
+ sigset_t saveset, newset;
+ /* XXX: Don't preclude handling different sized sigset_t's. */
+ if (sigsetsize != sizeof(sigset_t))
+ return -EINVAL;
+
+ if (copy_from_user(&newset, unewset, sizeof(newset)))
+ return -EFAULT;
+ sigdelsetmask(&newset, ~_BLOCKABLE);
+ spin_lock_irq(¤t->sighand->siglock);
+ saveset = current->blocked;
+ current->blocked = newset;
+ recalc_sigpending();
+ spin_unlock_irq(¤t->sighand->siglock);
+
+ regs->areg[2] = -EINTR;
+ while (1) {
+ current->state = TASK_INTERRUPTIBLE;
+ schedule();
+ if (do_signal(regs, &saveset))
+ return -EINTR;
+ }
+}
+
+asmlinkage int
+sys_sigaction(int sig, const struct old_sigaction *act,
+ struct old_sigaction *oact)
+{
+ struct k_sigaction new_ka, old_ka;
+ int ret;
+
+ if (act) {
+ old_sigset_t mask;
+ if (verify_area(VERIFY_READ, act, sizeof(*act)) ||
+ __get_user(new_ka.sa.sa_handler, &act->sa_handler) ||
+ __get_user(new_ka.sa.sa_restorer, &act->sa_restorer))
+ return -EFAULT;
+ __get_user(new_ka.sa.sa_flags, &act->sa_flags);
+ __get_user(mask, &act->sa_mask);
+ siginitset(&new_ka.sa.sa_mask, mask);
+ }
+
+ ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
+
+ if (!ret && oact) {
+ if (verify_area(VERIFY_WRITE, oact, sizeof(*oact)) ||
+ __put_user(old_ka.sa.sa_handler, &oact->sa_handler) ||
+ __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer))
+ return -EFAULT;
+ __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
+ __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask);
+ }
+
+ return ret;
+}
+
+asmlinkage int
+sys_sigaltstack(struct pt_regs *regs)
+{
+ const stack_t *uss = (stack_t *) regs->areg[4];
+ stack_t *uoss = (stack_t *) regs->areg[3];
+
+ if (regs->depc > 64)
+ panic ("Double exception sys_sigreturn\n");
+
+
+ return do_sigaltstack(uss, uoss, regs->areg[1]);
+}
+
+
+/*
+ * Do a signal return; undo the signal stack.
+ */
+
+struct sigframe
+{
+ struct sigcontext sc;
+ struct _cpstate cpstate;
+ unsigned long extramask[_NSIG_WORDS-1];
+ unsigned char retcode[6];
+ unsigned int reserved[4]; /* Reserved area for chaining */
+ unsigned int window[4]; /* Window of 4 registers for initial context */
+};
+
+struct rt_sigframe
+{
+ struct siginfo info;
+ struct ucontext uc;
+ struct _cpstate cpstate;
+ unsigned char retcode[6];
+ unsigned int reserved[4]; /* Reserved area for chaining */
+ unsigned int window[4]; /* Window of 4 registers for initial context */
+};
+
+extern void release_all_cp (struct task_struct *);
+
+
+// FIXME restore_cpextra
+static inline int
+restore_cpextra (struct _cpstate *buf)
+{
+#if 0
+ /* The signal handler may have used coprocessors in which
+ * case they are still enabled. We disable them to force a
+ * reloading of the original task's CP state by the lazy
+ * context-switching mechanisms of CP exception handling.
+ * Also, we essentially discard any coprocessor state that the
+ * signal handler created. */
+
+ struct task_struct *tsk = current;
+ release_all_cp(tsk);
+ return __copy_from_user(tsk->thread.cpextra, buf, TOTAL_CPEXTRA_SIZE);
+#endif
+ return 0;
+}
+
+/* Note: We don't copy double exception 'tregs', we have to finish double exc. first before we return to signal handler! This dbl.exc.handler might cause another double exception, but I think we are fine as the situation is the same as if we had returned to the signal handerl and got an interrupt immediately...
+ */
+
+
+static int
+restore_sigcontext(struct pt_regs *regs, struct sigcontext *sc)
+{
+ struct thread_struct *thread;
+ unsigned int err = 0;
+ unsigned long ps;
+ struct _cpstate *buf;
+
+#define COPY(x) err |= __get_user(regs->x, &sc->sc_##x)
+ COPY(pc);
+ COPY(depc);
+ COPY(wmask);
+ COPY(lbeg);
+ COPY(lend);
+ COPY(lcount);
+ COPY(sar);
+ COPY(windowbase);
+ COPY(windowstart);
+#undef COPY
+
+ /* For PS, restore only PS.CALLINC.
+ * Assume that all other bits are either the same as for the signal
+ * handler, or the user mode value doesn't matter (e.g. PS.OWB).
+ */
+ err |= __get_user(ps, &sc->sc_ps);
+ regs->ps = (regs->ps & ~XCHAL_PS_CALLINC_MASK)
+ | (ps & XCHAL_PS_CALLINC_MASK);
+
+ /* Additional corruption checks */
+
+ if ((regs->windowbase >= (XCHAL_NUM_AREGS/4))
+ || ((regs->windowstart & ~((1<<(XCHAL_NUM_AREGS/4)) - 1)) != 0) )
+ err = 1;
+ if ((regs->lcount > 0)
+ && ((regs->lbeg > TASK_SIZE) || (regs->lend > TASK_SIZE)) )
+ err = 1;
+
+ /* Restore extended register state.
+ * See struct thread_struct in processor.h.
+ */
+ thread = ¤t->thread;
+
+ err |= __copy_from_user (regs->areg, sc->sc_areg, XCHAL_NUM_AREGS*4);
+ err |= __get_user(buf, &sc->sc_cpstate);
+ if (buf) {
+ if (verify_area(VERIFY_READ, buf, sizeof(*buf)))
+ goto badframe;
+ err |= restore_cpextra(buf);
+ }
+
+ regs->syscall = -1; /* disable syscall checks */
+ return err;
+
+badframe:
+ return 1;
+}
+
+static inline void
+flush_my_cpstate(struct task_struct *tsk)
+{
+ unsigned long flags;
+ local_irq_save(flags);
+
+#if 0 // FIXME
+ for (i = 0; i < XCHAL_CP_NUM; i++) {
+ if (tsk == coproc_owners[i]) {
+ xthal_validate_cp(i);
+ xthal_save_cpregs(tsk->thread.cpregs_ptr[i], i);
+
+ /* Invalidate and "disown" the cp to allow
+ * callers the chance to reset cp state in the
+ * task_struct. */
+
+ xthal_invalidate_cp(i);
+ coproc_owners[i] = 0;
+ }
+ }
+#endif
+ local_irq_restore(flags);
+}
+
+/* Return codes:
+ 0: nothing saved
+ 1: stuff to save, successful
+ -1: stuff to save, error happened
+*/
+static int
+save_cpextra (struct _cpstate *buf)
+{
+#if (XCHAL_EXTRA_SA_SIZE == 0) && (XCHAL_CP_NUM == 0)
+ return 0;
+#else
+
+ /* FIXME: If a task has never used a coprocessor, there is
+ * no need to save and restore anything. Tracking this
+ * information would allow us to optimize this section.
+ * Perhaps we can use current->used_math or (current->flags &
+ * PF_USEDFPU) or define a new field in the thread
+ * structure. */
+
+ /* We flush any live, task-owned cp state to the task_struct,
+ * then copy it all to the sigframe. Then we clear all
+ * cp/extra state in the task_struct, effectively
+ * clearing/resetting all cp/extra state for the signal
+ * handler (cp-exception handling will load these new values
+ * into the cp/extra registers.) This step is important for
+ * things like a floating-point cp, where the OS must reset
+ * the FCR to the default rounding mode. */
+
+ int err = 0;
+ struct task_struct *tsk = current;
+
+ flush_my_cpstate(tsk);
+ /* Note that we just copy everything: 'extra' and 'cp' state together.*/
+ err |= __copy_to_user(buf, tsk->thread.cp_save, XTENSA_CP_EXTRA_SIZE);
+ memset(tsk->thread.cp_save, 0, XTENSA_CP_EXTRA_SIZE);
+
+#if (XTENSA_CP_EXTRA_SIZE == 0)
+#error Sanity check on memset above, cpextra_size should not be zero.
+#endif
+
+ return err ? -1 : 1;
+#endif
+}
+
+static int
+setup_sigcontext(struct sigcontext *sc, struct _cpstate *cpstate,
+ struct pt_regs *regs, unsigned long mask)
+{
+ struct thread_struct *thread;
+ int err = 0;
+
+//printk("setup_sigcontext\n");
+#define COPY(x) err |= __put_user(regs->x, &sc->sc_##x)
+ COPY(pc);
+ COPY(ps);
+ COPY(depc);
+ COPY(wmask);
+ COPY(lbeg);
+ COPY(lend);
+ COPY(lcount);
+ COPY(sar);
+ COPY(windowbase);
+ COPY(windowstart);
+#undef COPY
+
+ /* Save extended register state.
+ * See struct thread_struct in processor.h.
+ */
+ thread = ¤t->thread;
+ err |= __copy_to_user (sc->sc_areg, regs->areg, XCHAL_NUM_AREGS * 4);
+ err |= save_cpextra(cpstate);
+ err |= __put_user(err ? NULL : cpstate, &sc->sc_cpstate);
+ /* non-iBCS2 extensions.. */
+ err |= __put_user(mask, &sc->oldmask);
+
+ return err;
+}
+
+asmlinkage int sys_sigreturn(struct pt_regs *regs)
+{
+ struct sigframe *frame = (struct sigframe *)regs->areg[1];
+ sigset_t set;
+ if (regs->depc > 64)
+ panic ("Double exception sys_sigreturn\n");
+
+ if (verify_area(VERIFY_READ, frame, sizeof(*frame)))
+ goto badframe;
+
+ if (__get_user(set.sig[0], &frame->sc.oldmask)
+ || (_NSIG_WORDS > 1
+ && __copy_from_user(&set.sig[1], &frame->extramask,
+ sizeof(frame->extramask))))
+ goto badframe;
+
+ sigdelsetmask(&set, ~_BLOCKABLE);
+
+ spin_lock_irq(¤t->sighand->siglock);
+ current->blocked = set;
+ recalc_sigpending();
+ spin_unlock_irq(¤t->sighand->siglock);
+
+ if (restore_sigcontext(regs, &frame->sc))
+ goto badframe;
+ return regs->areg[2];
+
+badframe:
+ force_sig(SIGSEGV, current);
+ return 0;
+}
+
+asmlinkage int sys_rt_sigreturn(struct pt_regs *regs)
+{
+ struct rt_sigframe *frame = (struct rt_sigframe *)regs->areg[1];
+ sigset_t set;
+ stack_t st;
+ int ret;
+ if (regs->depc > 64)
+ {
+ printk("!!!!!!! DEPC !!!!!!!\n");
+ return 0;
+ }
+
+ if (verify_area(VERIFY_READ, frame, sizeof(*frame)))
+ goto badframe;
+
+ if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
+ goto badframe;
+
+ sigdelsetmask(&set, ~_BLOCKABLE);
+ spin_lock_irq(¤t->sighand->siglock);
+ current->blocked = set;
+ recalc_sigpending();
+ spin_unlock_irq(¤t->sighand->siglock);
+
+ if (restore_sigcontext(regs, &frame->uc.uc_mcontext))
+ goto badframe;
+ ret = regs->areg[2];
+
+ if (__copy_from_user(&st, &frame->uc.uc_stack, sizeof(st)))
+ goto badframe;
+ /* It is more difficult to avoid calling this function than to
+ call it and ignore errors. */
+ do_sigaltstack(&st, NULL, regs->areg[1]);
+
+ return ret;
+
+badframe:
+ force_sig(SIGSEGV, current);
+ return 0;
+}
+
+/*
+ * Set up a signal frame.
+ */
+
+/*
+ * Determine which stack to use..
+ */
+static inline void *
+get_sigframe(struct k_sigaction *ka, unsigned long sp, size_t frame_size)
+{
+ if ((ka->sa.sa_flags & SA_ONSTACK) != 0 && ! on_sig_stack(sp))
+ sp = current->sas_ss_sp + current->sas_ss_size;
+
+ return (void *)((sp - frame_size) & -16ul);
+}
+
+#define USE_SIGRETURN 0
+#define USE_RT_SIGRETURN 1
+
+static int
+gen_return_code(unsigned char *codemem, unsigned int use_rt_sigreturn)
+{
+ unsigned int retcall;
+ int err = 0;
+
+#if 0
+ /* Ignoring SA_RESTORER for now; it's supposed to be obsolete,
+ * and the xtensa glibc doesn't use it.
+ */
+ if (ka->sa.sa_flags & SA_RESTORER) {
+ regs->pr = (unsigned long) ka->sa.sa_restorer;
+ } else
+#endif /* 0 */
+ {
+
+#if (__NR_sigreturn > 255) || (__NR_rt_sigreturn > 255)
+
+/* The 12-bit immediate is really split up within the 24-bit MOVI
+ * instruction. As long as the above system call numbers fit within
+ * 8-bits, the following code works fine. See the Xtensa ISA for
+ * details.
+ */
+
+#error Generating the MOVI instruction below breaks!
+#endif
+
+ retcall = use_rt_sigreturn ? __NR_rt_sigreturn : __NR_sigreturn;
+
+#ifdef __XTENSA_EB__ /* Big Endian version */
+ /* Generate instruction: MOVI a2, retcall */
+ err |= __put_user(0x22, &codemem[0]);
+ err |= __put_user(0x0a, &codemem[1]);
+ err |= __put_user(retcall, &codemem[2]);
+ /* Generate instruction: SYSCALL */
+ err |= __put_user(0x00, &codemem[3]);
+ err |= __put_user(0x05, &codemem[4]);
+ err |= __put_user(0x00, &codemem[5]);
+
+#elif defined __XTENSA_EL__ /* Little Endian version */
+ /* Generate instruction: MOVI a2, retcall */
+ err |= __put_user(0x22, &codemem[0]);
+ err |= __put_user(0xa0, &codemem[1]);
+ err |= __put_user(retcall, &codemem[2]);
+ /* Generate instruction: SYSCALL */
+ err |= __put_user(0x00, &codemem[3]);
+ err |= __put_user(0x50, &codemem[4]);
+ err |= __put_user(0x00, &codemem[5]);
+#else
+#error Must use compiler for Xtensa processors.
+#endif
+ }
+
+ /* Flush generated code out of the data cache */
+
+ if (err == 0)
+ __flush_invalidate_cache_range((unsigned long)codemem, 6UL);
+
+ return err;
+}
+
+static void
+set_thread_state(struct pt_regs *regs, void *stack, unsigned char *retaddr,
+ void *handler, unsigned long arg1, void *arg2, void *arg3)
+{
+ /* Set up registers for signal handler */
+ start_thread(regs, (unsigned long) handler, (unsigned long) stack);
+
+ /* Set up a stack frame for a call4
+ * Note: PS.CALLINC is set to one by start_thread
+ */
+ regs->areg[4] = (((unsigned long) retaddr) & 0x3fffffff) | 0x40000000;
+ regs->areg[6] = arg1;
+ regs->areg[7] = (unsigned long) arg2;
+ regs->areg[8] = (unsigned long) arg3;
+}
+
+static void setup_frame(int sig, struct k_sigaction *ka,
+ sigset_t *set, struct pt_regs *regs)
+{
+ struct sigframe *frame;
+ int err = 0;
+ int signal;
+
+ frame = get_sigframe(ka, regs->areg[1], sizeof(*frame));
+ if (regs->depc > 64)
+ {
+ printk("!!!!!!! DEPC !!!!!!!\n");
+ return;
+ }
+
+
+ if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
+ goto give_sigsegv;
+
+ signal = current_thread_info()->exec_domain
+ && current_thread_info()->exec_domain->signal_invmap
+ && sig < 32
+ ? current_thread_info()->exec_domain->signal_invmap[sig]
+ : sig;
+
+ err |= setup_sigcontext(&frame->sc, &frame->cpstate, regs, set->sig[0]);
+
+ if (_NSIG_WORDS > 1) {
+ err |= __copy_to_user(frame->extramask, &set->sig[1],
+ sizeof(frame->extramask));
+ }
+
+ /* Create sys_sigreturn syscall in stack frame */
+ err |= gen_return_code(frame->retcode, USE_SIGRETURN);
+
+ if (err)
+ goto give_sigsegv;
+
+ /* Create signal handler execution context.
+ * Return context not modified until this point.
+ */
+ set_thread_state(regs, frame, frame->retcode,
+ ka->sa.sa_handler, signal, &frame->sc, NULL);
+
+ /* Set access mode to USER_DS. Nomenclature is outdated, but
+ * functionality is used in uaccess.h
+ */
+ set_fs(USER_DS);
+
+
+#if DEBUG_SIG
+ printk("SIG deliver (%s:%d): signal=%d sp=%p pc=%08x\n",
+ current->comm, current->pid, signal, frame, regs->pc);
+#endif
+
+ return;
+
+give_sigsegv:
+ if (sig == SIGSEGV)
+ ka->sa.sa_handler = SIG_DFL;
+ force_sig(SIGSEGV, current);
+}
+
+static void setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
+ sigset_t *set, struct pt_regs *regs)
+{
+ struct rt_sigframe *frame;
+ int err = 0;
+ int signal;
+
+ frame = get_sigframe(ka, regs->areg[1], sizeof(*frame));
+ if (regs->depc > 64)
+ panic ("Double exception sys_sigreturn\n");
+
+ if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
+ goto give_sigsegv;
+
+ signal = current_thread_info()->exec_domain
+ && current_thread_info()->exec_domain->signal_invmap
+ && sig < 32
+ ? current_thread_info()->exec_domain->signal_invmap[sig]
+ : sig;
+
+ err |= copy_siginfo_to_user(&frame->info, info);
+
+ /* Create the ucontext. */
+ err |= __put_user(0, &frame->uc.uc_flags);
+ err |= __put_user(0, &frame->uc.uc_link);
+ err |= __put_user((void *)current->sas_ss_sp,
+ &frame->uc.uc_stack.ss_sp);
+ err |= __put_user(sas_ss_flags(regs->areg[1]),
+ &frame->uc.uc_stack.ss_flags);
+ err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
+ err |= setup_sigcontext(&frame->uc.uc_mcontext, &frame->cpstate,
+ regs, set->sig[0]);
+ err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
+
+ /* Create sys_rt_sigreturn syscall in stack frame */
+ err |= gen_return_code(frame->retcode, USE_RT_SIGRETURN);
+
+ if (err)
+ goto give_sigsegv;
+
+ /* Create signal handler execution context.
+ * Return context not modified until this point.
+ */
+ set_thread_state(regs, frame, frame->retcode,
+ ka->sa.sa_handler, signal, &frame->info, &frame->uc);
+
+ /* Set access mode to USER_DS. Nomenclature is outdated, but
+ * functionality is used in uaccess.h
+ */
+ set_fs(USER_DS);
+
+#if DEBUG_SIG
+ printk("SIG rt deliver (%s:%d): signal=%d sp=%p pc=%08x\n",
+ current->comm, current->pid, signal, frame, regs->pc);
+#endif
+
+ return;
+
+give_sigsegv:
+ if (sig == SIGSEGV)
+ ka->sa.sa_handler = SIG_DFL;
+ force_sig(SIGSEGV, current);
+}
+
+
+
+/*
+ * Note that 'init' is a special process: it doesn't get signals it doesn't
+ * want to handle. Thus you cannot kill init even with a SIGKILL even by
+ * mistake.
+ *
+ * Note that we go through the signals twice: once to check the signals that
+ * the kernel can handle, and then we build all the user-level signal handling
+ * stack-frames in one go after that.
+ */
+int do_signal(struct pt_regs *regs, sigset_t *oldset)
+{
+ siginfo_t info;
+ int signr;
+ struct k_sigaction ka;
+
+ if (!oldset)
+ oldset = ¤t->blocked;
+
+ signr = get_signal_to_deliver(&info, &ka, regs, NULL);
+
+ /* Are we from a system call? */
+ if (regs->syscall >= 0) {
+ /* If so, check system call restarting.. */
+ switch (regs->areg[2]) {
+ case ERESTARTNOHAND:
+ case ERESTART_RESTARTBLOCK:
+ regs->areg[2] = -EINTR;
+ break;
+
+ case ERESTARTSYS:
+ if (!(ka.sa.sa_flags & SA_RESTART)) {
+ regs->areg[2] = -EINTR;
+ break;
+ }
+ /* fallthrough */
+ case ERESTARTNOINTR:
+ regs->areg[2] = regs->syscall;
+ regs->pc -= 3;
+ }
+ }
+
+ if (signr == 0)
+ return 0; /* no signals delivered */
+
+ /* Whee! Actually deliver the signal. */
+
+ /* Set up the stack frame */
+ if (ka.sa.sa_flags & SA_SIGINFO)
+ setup_rt_frame(signr, &ka, &info, oldset, regs);
+ else
+ setup_frame(signr, &ka, oldset, regs);
+
+ if (ka.sa.sa_flags & SA_ONESHOT)
+ ka.sa.sa_handler = SIG_DFL;
+
+ if (!(ka.sa.sa_flags & SA_NODEFER)) {
+ spin_lock_irq(¤t->sighand->siglock);
+ sigorsets(¤t->blocked, ¤t->blocked, &ka.sa.sa_mask);
+ sigaddset(¤t->blocked, signr);
+ recalc_sigpending();
+ spin_unlock_irq(¤t->sighand->siglock);
+ }
+ return 1;
+}
--- /dev/null
+/*
+ * arch/xtensa/kernel/syscall.c
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2001 - 2005 Tensilica Inc.
+ * Copyright (C) 2000 Silicon Graphics, Inc.
+ * Copyright (C) 1995 - 2000 by Ralf Baechle
+ *
+ * Joe Taylor <joe@tensilica.com, joetylr@yahoo.com>
+ * Marc Gauthier <marc@tensilica.com, marc@alumni.uwaterloo.ca>
+ * Chris Zankel <chris@zankel.net>
+ * Kevin Chea
+ *
+ */
+
+#define DEBUG 0
+
+#include <linux/config.h>
+#include <linux/linkage.h>
+#include <linux/mm.h>
+#include <linux/smp.h>
+#include <linux/smp_lock.h>
+#include <linux/mman.h>
+#include <linux/sched.h>
+#include <linux/file.h>
+#include <linux/slab.h>
+#include <linux/utsname.h>
+#include <linux/unistd.h>
+#include <linux/stringify.h>
+#include <linux/syscalls.h>
+#include <linux/sem.h>
+#include <linux/msg.h>
+#include <linux/shm.h>
+#include <linux/errno.h>
+#include <asm/ptrace.h>
+#include <asm/signal.h>
+#include <asm/uaccess.h>
+#include <asm/hardirq.h>
+#include <asm/mman.h>
+#include <asm/shmparam.h>
+#include <asm/page.h>
+#include <asm/ipc.h>
+
+extern void do_syscall_trace(void);
+typedef int (*syscall_t)(void *a0,...);
+extern int (*do_syscalls)(struct pt_regs *regs, syscall_t fun,
+ int narg);
+extern syscall_t sys_call_table[];
+extern unsigned char sys_narg_table[];
+
+/*
+ * sys_pipe() is the normal C calling standard for creating a pipe. It's not
+ * the way unix traditional does this, though.
+ */
+
+int sys_pipe(int __user *userfds)
+{
+ int fd[2];
+ int error;
+
+ error = do_pipe(fd);
+ if (!error) {
+ if (copy_to_user(userfds, fd, 2 * sizeof(int)))
+ error = -EFAULT;
+ }
+ return error;
+}
+
+/*
+ * Common code for old and new mmaps.
+ */
+
+static inline long do_mmap2(unsigned long addr, unsigned long len,
+ unsigned long prot, unsigned long flags,
+ unsigned long fd, unsigned long pgoff)
+{
+ int error = -EBADF;
+ struct file * file = NULL;
+
+ flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
+ if (!(flags & MAP_ANONYMOUS)) {
+ file = fget(fd);
+ if (!file)
+ goto out;
+ }
+
+ down_write(¤t->mm->mmap_sem);
+ error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
+ up_write(¤t->mm->mmap_sem);
+
+ if (file)
+ fput(file);
+out:
+ return error;
+}
+
+unsigned long old_mmap(unsigned long addr, size_t len, int prot,
+ int flags, int fd, off_t offset)
+{
+ return do_mmap2(addr, len, prot, flags, fd, offset >> PAGE_SHIFT);
+}
+
+long sys_mmap2(unsigned long addr, unsigned long len, unsigned long prot,
+ unsigned long flags, unsigned long fd, unsigned long pgoff)
+{
+ return do_mmap2(addr, len, prot, flags, fd, pgoff);
+}
+
+int sys_fork(struct pt_regs *regs)
+{
+ return do_fork(SIGCHLD, regs->areg[1], regs, 0, NULL, NULL);
+}
+
+int sys_vfork(struct pt_regs *regs)
+{
+ return do_fork(CLONE_VFORK|CLONE_VM|SIGCHLD, regs->areg[1],
+ regs, 0, NULL, NULL);
+}
+
+int sys_clone(struct pt_regs *regs)
+{
+ unsigned long clone_flags;
+ unsigned long newsp;
+ int __user *parent_tidptr, *child_tidptr;
+ clone_flags = regs->areg[4];
+ newsp = regs->areg[3];
+ parent_tidptr = (int __user *)regs->areg[5];
+ child_tidptr = (int __user *)regs->areg[6];
+ if (!newsp)
+ newsp = regs->areg[1];
+ return do_fork(clone_flags,newsp,regs,0,parent_tidptr,child_tidptr);
+}
+
+/*
+ * sys_execve() executes a new program.
+ */
+
+int sys_execve(struct pt_regs *regs)
+{
+ int error;
+ char * filename;
+
+ filename = getname((char *) (long)regs->areg[5]);
+ error = PTR_ERR(filename);
+ if (IS_ERR(filename))
+ goto out;
+ error = do_execve(filename, (char **) (long)regs->areg[3],
+ (char **) (long)regs->areg[4], regs);
+ putname(filename);
+
+out:
+ return error;
+}
+
+int sys_uname(struct old_utsname * name)
+{
+ if (name && !copy_to_user(name, &system_utsname, sizeof (*name)))
+ return 0;
+ return -EFAULT;
+}
+
+int sys_olduname(struct oldold_utsname * name)
+{
+ int error;
+
+ if (!name)
+ return -EFAULT;
+ if (!access_ok(VERIFY_WRITE,name,sizeof(struct oldold_utsname)))
+ return -EFAULT;
+
+ error = __copy_to_user(&name->sysname,&system_utsname.sysname,__OLD_UTS_LEN);
+ error -= __put_user(0,name->sysname+__OLD_UTS_LEN);
+ error -= __copy_to_user(&name->nodename,&system_utsname.nodename,__OLD_UTS_LEN);
+ error -= __put_user(0,name->nodename+__OLD_UTS_LEN);
+ error -= __copy_to_user(&name->release,&system_utsname.release,__OLD_UTS_LEN);
+ error -= __put_user(0,name->release+__OLD_UTS_LEN);
+ error -= __copy_to_user(&name->version,&system_utsname.version,__OLD_UTS_LEN);
+ error -= __put_user(0,name->version+__OLD_UTS_LEN);
+ error -= __copy_to_user(&name->machine,&system_utsname.machine,__OLD_UTS_LEN);
+ error -= __put_user(0,name->machine+__OLD_UTS_LEN);
+
+ return error ? -EFAULT : 0;
+}
+
+
+/*
+ * Build the string table for the builtin "poor man's strace".
+ */
+
+#if DEBUG
+#define SYSCALL(fun, narg) #fun,
+static char *sfnames[] = {
+#include "syscalls.h"
+};
+#undef SYS
+#endif
+
+void system_call (struct pt_regs *regs)
+{
+ syscall_t syscall;
+ unsigned long parm0, parm1, parm2, parm3, parm4, parm5;
+ int nargs, res;
+ unsigned int syscallnr;
+ int ps;
+
+#if DEBUG
+ int i;
+ unsigned long parms[6];
+ char *sysname;
+#endif
+
+ regs->syscall = regs->areg[2];
+
+ do_syscall_trace();
+
+ /* Have to load after syscall_trace because strace
+ * sometimes changes regs->syscall.
+ */
+ syscallnr = regs->syscall;
+
+ parm0 = parm1 = parm2 = parm3 = parm4 = parm5 = 0;
+
+ /* Restore interrupt level to syscall invoker's.
+ * If this were in assembly, we wouldn't disable
+ * interrupts in the first place:
+ */
+ local_save_flags (ps);
+ local_irq_restore((ps & ~XCHAL_PS_INTLEVEL_MASK) |
+ (regs->ps & XCHAL_PS_INTLEVEL_MASK) );
+
+ if (syscallnr > __NR_Linux_syscalls) {
+ regs->areg[2] = -ENOSYS;
+ return;
+ }
+
+ syscall = sys_call_table[syscallnr];
+ nargs = sys_narg_table[syscallnr];
+
+ if (syscall == NULL) {
+ regs->areg[2] = -ENOSYS;
+ return;
+ }
+
+ /* There shouldn't be more than six arguments in the table! */
+
+ if (nargs > 6)
+ panic("Internal error - too many syscall arguments (%d)!\n",
+ nargs);
+
+ /* Linux takes system-call arguments in registers. The ABI
+ * and Xtensa software conventions require the system-call
+ * number in a2. If an argument exists in a2, we move it to
+ * the next available register. Note that for improved
+ * efficiency, we do NOT shift all parameters down one
+ * register to maintain the original order.
+ *
+ * At best case (zero arguments), we just write the syscall
+ * number to a2. At worst case (1 to 6 arguments), we move
+ * the argument in a2 to the next available register, then
+ * write the syscall number to a2.
+ *
+ * For clarity, the following truth table enumerates all
+ * possibilities.
+ *
+ * arguments syscall number arg0, arg1, arg2, arg3, arg4, arg5
+ * --------- -------------- ----------------------------------
+ * 0 a2
+ * 1 a2 a3
+ * 2 a2 a4, a3
+ * 3 a2 a5, a3, a4
+ * 4 a2 a6, a3, a4, a5
+ * 5 a2 a7, a3, a4, a5, a6
+ * 6 a2 a8, a3, a4, a5, a6, a7
+ */
+ if (nargs) {
+ parm0 = regs->areg[nargs+2];
+ parm1 = regs->areg[3];
+ parm2 = regs->areg[4];
+ parm3 = regs->areg[5];
+ parm4 = regs->areg[6];
+ parm5 = regs->areg[7];
+ } else /* nargs == 0 */
+ parm0 = (unsigned long) regs;
+
+#if DEBUG
+ parms[0] = parm0;
+ parms[1] = parm1;
+ parms[2] = parm2;
+ parms[3] = parm3;
+ parms[4] = parm4;
+ parms[5] = parm5;
+
+ sysname = sfnames[syscallnr];
+ if (strncmp(sysname, "sys_", 4) == 0)
+ sysname = sysname + 4;
+
+ printk("\017SYSCALL:I:%x:%d:%s %s(", regs->pc, current->pid,
+ current->comm, sysname);
+ for (i = 0; i < nargs; i++)
+ printk((i>0) ? ", %#lx" : "%#lx", parms[i]);
+ printk(")\n");
+#endif
+
+ res = syscall((void *)parm0, parm1, parm2, parm3, parm4, parm5);
+
+#if DEBUG
+ printk("\017SYSCALL:O:%d:%s %s(",current->pid, current->comm, sysname);
+ for (i = 0; i < nargs; i++)
+ printk((i>0) ? ", %#lx" : "%#lx", parms[i]);
+ if (res < 4096)
+ printk(") = %d\n", res);
+ else
+ printk(") = %#x\n", res);
+#endif /* DEBUG */
+
+ regs->areg[2] = res;
+ do_syscall_trace();
+}
+
+/*
+ * sys_ipc() is the de-multiplexer for the SysV IPC calls..
+ *
+ * This is really horribly ugly.
+ */
+
+int sys_ipc (uint call, int first, int second,
+ int third, void __user *ptr, long fifth)
+{
+ int version, ret;
+
+ version = call >> 16; /* hack for backward compatibility */
+ call &= 0xffff;
+ ret = -ENOSYS;
+
+ switch (call) {
+ case SEMOP:
+ ret = sys_semtimedop (first, (struct sembuf __user *)ptr,
+ second, NULL);
+ break;
+
+ case SEMTIMEDOP:
+ ret = sys_semtimedop (first, (struct sembuf __user *)ptr,
+ second, (const struct timespec *) fifth);
+ break;
+
+ case SEMGET:
+ ret = sys_semget (first, second, third);
+ break;
+
+ case SEMCTL: {
+ union semun fourth;
+
+ if (ptr && !get_user(fourth.__pad, (void *__user *) ptr))
+ ret = sys_semctl (first, second, third, fourth);
+ break;
+ }
+
+ case MSGSND:
+ ret = sys_msgsnd (first, (struct msgbuf __user*) ptr,
+ second, third);
+ break;
+
+ case MSGRCV:
+ switch (version) {
+ case 0: {
+ struct ipc_kludge tmp;
+
+ if (ptr && !copy_from_user(&tmp,
+ (struct ipc_kludge *) ptr,
+ sizeof (tmp)))
+ ret = sys_msgrcv (first, tmp.msgp, second,
+ tmp.msgtyp, third);
+ break;
+ }
+
+ default:
+ ret = sys_msgrcv (first, (struct msgbuf __user *) ptr,
+ second, 0, third);
+ break;
+ }
+ break;
+
+ case MSGGET:
+ ret = sys_msgget ((key_t) first, second);
+ break;
+
+ case MSGCTL:
+ ret = sys_msgctl (first, second, (struct msqid_ds __user*) ptr);
+ break;
+
+ case SHMAT: {
+ ulong raddr;
+ ret = do_shmat (first, (char __user *) ptr, second, &raddr);
+
+ if (!ret)
+ ret = put_user (raddr, (ulong __user *) third);
+
+ break;
+ }
+
+ case SHMDT:
+ ret = sys_shmdt ((char __user *)ptr);
+ break;
+
+ case SHMGET:
+ ret = sys_shmget (first, second, third);
+ break;
+
+ case SHMCTL:
+ ret = sys_shmctl (first, second, (struct shmid_ds __user*) ptr);
+ break;
+ }
+ return ret;
+}
+
--- /dev/null
+/*
+ * arch/xtensa/kernel/syscalls.h
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 1995, 1996, 1997, 1998 by Ralf Baechle
+ * Copyright (C) 2001 - 2005 Tensilica Inc.
+ *
+ * Changes by Joe Taylor <joe@tensilica.com>
+ */
+
+/*
+ * This file is being included twice - once to build a list of all
+ * syscalls and once to build a table of how many arguments each syscall
+ * accepts. Syscalls that receive a pointer to the saved registers are
+ * marked as having zero arguments.
+ *
+ * The binary compatibility calls are in a separate list.
+ *
+ * Entry '0' used to be system_call. It's removed to disable indirect
+ * system calls for now so user tasks can't recurse. See mips'
+ * sys_syscall for a comparable example.
+ */
+
+SYSCALL(0, 0) /* 00 */
+
+SYSCALL(sys_exit, 1)
+SYSCALL(sys_fork, 0)
+SYSCALL(sys_read, 3)
+SYSCALL(sys_write, 3)
+SYSCALL(sys_open, 3) /* 05 */
+SYSCALL(sys_close, 1)
+SYSCALL(sys_waitpid, 3)
+SYSCALL(sys_creat, 2)
+SYSCALL(sys_link, 2)
+SYSCALL(sys_unlink, 1) /* 10 */
+SYSCALL(sys_execve, 0)
+SYSCALL(sys_chdir, 1)
+SYSCALL(sys_time, 1)
+SYSCALL(sys_mknod, 3)
+SYSCALL(sys_chmod, 2) /* 15 */
+SYSCALL(sys_lchown, 3)
+SYSCALL(sys_ni_syscall, 0)
+SYSCALL(sys_stat, 2)
+SYSCALL(sys_lseek, 3)
+SYSCALL(sys_getpid, 0) /* 20 */
+SYSCALL(sys_mount, 5)
+SYSCALL(sys_oldumount, 1)
+SYSCALL(sys_setuid, 1)
+SYSCALL(sys_getuid, 0)
+SYSCALL(sys_stime, 1) /* 25 */
+SYSCALL(sys_ptrace, 4)
+SYSCALL(sys_alarm, 1)
+SYSCALL(sys_fstat, 2)
+SYSCALL(sys_pause, 0)
+SYSCALL(sys_utime, 2) /* 30 */
+SYSCALL(sys_ni_syscall, 0)
+SYSCALL(sys_ni_syscall, 0)
+SYSCALL(sys_access, 2)
+SYSCALL(sys_nice, 1)
+SYSCALL(sys_ni_syscall, 0) /* 35 */
+SYSCALL(sys_sync, 0)
+SYSCALL(sys_kill, 2)
+SYSCALL(sys_rename, 2)
+SYSCALL(sys_mkdir, 2)
+SYSCALL(sys_rmdir, 1) /* 40 */
+SYSCALL(sys_dup, 1)
+SYSCALL(sys_pipe, 1)
+SYSCALL(sys_times, 1)
+SYSCALL(sys_ni_syscall, 0)
+SYSCALL(sys_brk, 1) /* 45 */
+SYSCALL(sys_setgid, 1)
+SYSCALL(sys_getgid, 0)
+SYSCALL(sys_ni_syscall, 0) /* was signal(2) */
+SYSCALL(sys_geteuid, 0)
+SYSCALL(sys_getegid, 0) /* 50 */
+SYSCALL(sys_acct, 1)
+SYSCALL(sys_umount, 2)
+SYSCALL(sys_ni_syscall, 0)
+SYSCALL(sys_ioctl, 3)
+SYSCALL(sys_fcntl, 3) /* 55 */
+SYSCALL(sys_ni_syscall, 2)
+SYSCALL(sys_setpgid, 2)
+SYSCALL(sys_ni_syscall, 0)
+SYSCALL(sys_olduname, 1)
+SYSCALL(sys_umask, 1) /* 60 */
+SYSCALL(sys_chroot, 1)
+SYSCALL(sys_ustat, 2)
+SYSCALL(sys_dup2, 2)
+SYSCALL(sys_getppid, 0)
+SYSCALL(sys_getpgrp, 0) /* 65 */
+SYSCALL(sys_setsid, 0)
+SYSCALL(sys_sigaction, 3)
+SYSCALL(sys_sgetmask, 0)
+SYSCALL(sys_ssetmask, 1)
+SYSCALL(sys_setreuid, 2) /* 70 */
+SYSCALL(sys_setregid, 2)
+SYSCALL(sys_sigsuspend, 0)
+SYSCALL(sys_sigpending, 1)
+SYSCALL(sys_sethostname, 2)
+SYSCALL(sys_setrlimit, 2) /* 75 */
+SYSCALL(sys_getrlimit, 2)
+SYSCALL(sys_getrusage, 2)
+SYSCALL(sys_gettimeofday, 2)
+SYSCALL(sys_settimeofday, 2)
+SYSCALL(sys_getgroups, 2) /* 80 */
+SYSCALL(sys_setgroups, 2)
+SYSCALL(sys_ni_syscall, 0) /* old_select */
+SYSCALL(sys_symlink, 2)
+SYSCALL(sys_lstat, 2)
+SYSCALL(sys_readlink, 3) /* 85 */
+SYSCALL(sys_uselib, 1)
+SYSCALL(sys_swapon, 2)
+SYSCALL(sys_reboot, 3)
+SYSCALL(old_readdir, 3)
+SYSCALL(old_mmap, 6) /* 90 */
+SYSCALL(sys_munmap, 2)
+SYSCALL(sys_truncate, 2)
+SYSCALL(sys_ftruncate, 2)
+SYSCALL(sys_fchmod, 2)
+SYSCALL(sys_fchown, 3) /* 95 */
+SYSCALL(sys_getpriority, 2)
+SYSCALL(sys_setpriority, 3)
+SYSCALL(sys_ni_syscall, 0)
+SYSCALL(sys_statfs, 2)
+SYSCALL(sys_fstatfs, 2) /* 100 */
+SYSCALL(sys_ni_syscall, 3)
+SYSCALL(sys_socketcall, 2)
+SYSCALL(sys_syslog, 3)
+SYSCALL(sys_setitimer, 3)
+SYSCALL(sys_getitimer, 2) /* 105 */
+SYSCALL(sys_newstat, 2)
+SYSCALL(sys_newlstat, 2)
+SYSCALL(sys_newfstat, 2)
+SYSCALL(sys_uname, 1)
+SYSCALL(sys_ni_syscall, 0) /* 110 */
+SYSCALL(sys_vhangup, 0)
+SYSCALL(sys_ni_syscall, 0) /* was sys_idle() */
+SYSCALL(sys_ni_syscall, 0)
+SYSCALL(sys_wait4, 4)
+SYSCALL(sys_swapoff, 1) /* 115 */
+SYSCALL(sys_sysinfo, 1)
+SYSCALL(sys_ipc, 5) /* 6 really, but glibc uses only 5) */
+SYSCALL(sys_fsync, 1)
+SYSCALL(sys_sigreturn, 0)
+SYSCALL(sys_clone, 0) /* 120 */
+SYSCALL(sys_setdomainname, 2)
+SYSCALL(sys_newuname, 1)
+SYSCALL(sys_ni_syscall, 0) /* sys_modify_ldt */
+SYSCALL(sys_adjtimex, 1)
+SYSCALL(sys_mprotect, 3) /* 125 */
+SYSCALL(sys_sigprocmask, 3)
+SYSCALL(sys_ni_syscall, 2) /* old sys_create_module */
+SYSCALL(sys_init_module, 2)
+SYSCALL(sys_delete_module, 1)
+SYSCALL(sys_ni_syscall, 1) /* old sys_get_kernel_sysm */ /* 130 */
+SYSCALL(sys_quotactl, 0)
+SYSCALL(sys_getpgid, 1)
+SYSCALL(sys_fchdir, 1)
+SYSCALL(sys_bdflush, 2)
+SYSCALL(sys_sysfs, 3) /* 135 */
+SYSCALL(sys_personality, 1)
+SYSCALL(sys_ni_syscall, 0) /* for afs_syscall */
+SYSCALL(sys_setfsuid, 1)
+SYSCALL(sys_setfsgid, 1)
+SYSCALL(sys_llseek, 5) /* 140 */
+SYSCALL(sys_getdents, 3)
+SYSCALL(sys_select, 5)
+SYSCALL(sys_flock, 2)
+SYSCALL(sys_msync, 3)
+SYSCALL(sys_readv, 3) /* 145 */
+SYSCALL(sys_writev, 3)
+SYSCALL(sys_ni_syscall, 3)
+SYSCALL(sys_ni_syscall, 3)
+SYSCALL(sys_ni_syscall, 4) /* handled in fast syscall handler. */
+SYSCALL(sys_ni_syscall, 0) /* 150 */
+SYSCALL(sys_getsid, 1)
+SYSCALL(sys_fdatasync, 1)
+SYSCALL(sys_sysctl, 1)
+SYSCALL(sys_mlock, 2)
+SYSCALL(sys_munlock, 2) /* 155 */
+SYSCALL(sys_mlockall, 1)
+SYSCALL(sys_munlockall, 0)
+SYSCALL(sys_sched_setparam,2)
+SYSCALL(sys_sched_getparam,2)
+SYSCALL(sys_sched_setscheduler,3) /* 160 */
+SYSCALL(sys_sched_getscheduler,1)
+SYSCALL(sys_sched_yield,0)
+SYSCALL(sys_sched_get_priority_max,1)
+SYSCALL(sys_sched_get_priority_min,1)
+SYSCALL(sys_sched_rr_get_interval,2) /* 165 */
+SYSCALL(sys_nanosleep,2)
+SYSCALL(sys_mremap,4)
+SYSCALL(sys_accept, 3)
+SYSCALL(sys_bind, 3)
+SYSCALL(sys_connect, 3) /* 170 */
+SYSCALL(sys_getpeername, 3)
+SYSCALL(sys_getsockname, 3)
+SYSCALL(sys_getsockopt, 5)
+SYSCALL(sys_listen, 2)
+SYSCALL(sys_recv, 4) /* 175 */
+SYSCALL(sys_recvfrom, 6)
+SYSCALL(sys_recvmsg, 3)
+SYSCALL(sys_send, 4)
+SYSCALL(sys_sendmsg, 3)
+SYSCALL(sys_sendto, 6) /* 180 */
+SYSCALL(sys_setsockopt, 5)
+SYSCALL(sys_shutdown, 2)
+SYSCALL(sys_socket, 3)
+SYSCALL(sys_socketpair, 4)
+SYSCALL(sys_setresuid, 3) /* 185 */
+SYSCALL(sys_getresuid, 3)
+SYSCALL(sys_ni_syscall, 5) /* old sys_query_module */
+SYSCALL(sys_poll, 3)
+SYSCALL(sys_nfsservctl, 3)
+SYSCALL(sys_setresgid, 3) /* 190 */
+SYSCALL(sys_getresgid, 3)
+SYSCALL(sys_prctl, 5)
+SYSCALL(sys_rt_sigreturn, 0)
+SYSCALL(sys_rt_sigaction, 4)
+SYSCALL(sys_rt_sigprocmask, 4) /* 195 */
+SYSCALL(sys_rt_sigpending, 2)
+SYSCALL(sys_rt_sigtimedwait, 4)
+SYSCALL(sys_rt_sigqueueinfo, 3)
+SYSCALL(sys_rt_sigsuspend, 0)
+SYSCALL(sys_pread64, 5) /* 200 */
+SYSCALL(sys_pwrite64, 5)
+SYSCALL(sys_chown, 3)
+SYSCALL(sys_getcwd, 2)
+SYSCALL(sys_capget, 2)
+SYSCALL(sys_capset, 2) /* 205 */
+SYSCALL(sys_sigaltstack, 0)
+SYSCALL(sys_sendfile, 4)
+SYSCALL(sys_ni_syscall, 0)
+SYSCALL(sys_ni_syscall, 0)
+SYSCALL(sys_mmap2, 6) /* 210 */
+SYSCALL(sys_truncate64, 2)
+SYSCALL(sys_ftruncate64, 2)
+SYSCALL(sys_stat64, 2)
+SYSCALL(sys_lstat64, 2)
+SYSCALL(sys_fstat64, 2) /* 215 */
+SYSCALL(sys_pivot_root, 2)
+SYSCALL(sys_mincore, 3)
+SYSCALL(sys_madvise, 3)
+SYSCALL(sys_getdents64, 3)
+SYSCALL(sys_vfork, 0) /* 220 */
--- /dev/null
+/*
+ * arch/xtensa/kernel/time.c
+ *
+ * Timer and clock support.
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2005 Tensilica Inc.
+ *
+ * Chris Zankel <chris@zankel.net>
+ */
+
+#include <linux/config.h>
+#include <linux/errno.h>
+#include <linux/time.h>
+#include <linux/timex.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/irq.h>
+#include <linux/profile.h>
+#include <linux/delay.h>
+
+#include <asm/timex.h>
+#include <asm/platform.h>
+
+
+extern volatile unsigned long wall_jiffies;
+
+u64 jiffies_64 = INITIAL_JIFFIES;
+EXPORT_SYMBOL(jiffies_64);
+
+spinlock_t rtc_lock = SPIN_LOCK_UNLOCKED;
+EXPORT_SYMBOL(rtc_lock);
+
+
+#ifdef CONFIG_XTENSA_CALIBRATE_CCOUNT
+unsigned long ccount_per_jiffy; /* per 1/HZ */
+unsigned long ccount_nsec; /* nsec per ccount increment */
+#endif
+
+unsigned int last_ccount_stamp;
+static long last_rtc_update = 0;
+
+/*
+ * Scheduler clock - returns current tim in nanosec units.
+ */
+
+unsigned long long sched_clock(void)
+{
+ return (unsigned long long)jiffies * (1000000000 / HZ);
+}
+
+static irqreturn_t timer_interrupt(int irq, void *dev_id, struct pt_regs *regs);
+static struct irqaction timer_irqaction = {
+ .handler = timer_interrupt,
+ .flags = SA_INTERRUPT,
+ .name = "timer",
+};
+
+void __init time_init(void)
+{
+ time_t sec_o, sec_n = 0;
+
+ /* The platform must provide a function to calibrate the processor
+ * speed for the CALIBRATE.
+ */
+
+#if CONFIG_XTENSA_CALIBRATE_CCOUNT
+ printk("Calibrating CPU frequency ");
+ platform_calibrate_ccount();
+ printk("%d.%02d MHz\n", (int)ccount_per_jiffy/(1000000/HZ),
+ (int)(ccount_per_jiffy/(10000/HZ))%100);
+#endif
+
+ /* Set time from RTC (if provided) */
+
+ if (platform_get_rtc_time(&sec_o) == 0)
+ while (platform_get_rtc_time(&sec_n))
+ if (sec_o != sec_n)
+ break;
+
+ xtime.tv_nsec = 0;
+ last_rtc_update = xtime.tv_sec = sec_n;
+ last_ccount_stamp = get_ccount();
+
+ set_normalized_timespec(&wall_to_monotonic,
+ -xtime.tv_sec, -xtime.tv_nsec);
+
+ /* Initialize the linux timer interrupt. */
+
+ setup_irq(LINUX_TIMER_INT, &timer_irqaction);
+ set_linux_timer(get_ccount() + CCOUNT_PER_JIFFY);
+}
+
+
+int do_settimeofday(struct timespec *tv)
+{
+ time_t wtm_sec, sec = tv->tv_sec;
+ long wtm_nsec, nsec = tv->tv_nsec;
+ unsigned long ccount;
+
+ if ((unsigned long)tv->tv_nsec >= NSEC_PER_SEC)
+ return -EINVAL;
+
+ write_seqlock_irq(&xtime_lock);
+
+ /* This is revolting. We need to set "xtime" correctly. However, the
+ * value in this location is the value at the most recent update of
+ * wall time. Discover what correction gettimeofday() would have
+ * made, and then undo it!
+ */
+ ccount = get_ccount();
+ nsec -= (ccount - last_ccount_stamp) * CCOUNT_NSEC;
+ nsec -= (jiffies - wall_jiffies) * CCOUNT_PER_JIFFY * CCOUNT_NSEC;
+
+ wtm_sec = wall_to_monotonic.tv_sec + (xtime.tv_sec - sec);
+ wtm_nsec = wall_to_monotonic.tv_nsec + (xtime.tv_nsec - nsec);
+
+ set_normalized_timespec(&xtime, sec, nsec);
+ set_normalized_timespec(&wall_to_monotonic, wtm_sec, wtm_nsec);
+
+ time_adjust = 0; /* stop active adjtime() */
+ time_status |= STA_UNSYNC;
+ time_maxerror = NTP_PHASE_LIMIT;
+ time_esterror = NTP_PHASE_LIMIT;
+ write_sequnlock_irq(&xtime_lock);
+ return 0;
+}
+
+EXPORT_SYMBOL(do_settimeofday);
+
+
+void do_gettimeofday(struct timeval *tv)
+{
+ unsigned long flags;
+ unsigned long sec, usec, delta, lost, seq;
+
+ do {
+ seq = read_seqbegin_irqsave(&xtime_lock, flags);
+
+ delta = get_ccount() - last_ccount_stamp;
+ sec = xtime.tv_sec;
+ usec = (xtime.tv_nsec / NSEC_PER_USEC);
+
+ lost = jiffies - wall_jiffies;
+
+ } while (read_seqretry_irqrestore(&xtime_lock, seq, flags));
+
+ usec += lost * (1000000UL/HZ) + (delta * CCOUNT_NSEC) / NSEC_PER_USEC;
+ for (; usec >= 1000000; sec++, usec -= 1000000)
+ ;
+
+ tv->tv_sec = sec;
+ tv->tv_usec = usec;
+}
+
+EXPORT_SYMBOL(do_gettimeofday);
+
+/*
+ * The timer interrupt is called HZ times per second.
+ */
+
+irqreturn_t timer_interrupt (int irq, void *dev_id, struct pt_regs *regs)
+{
+
+ unsigned long next;
+
+ next = get_linux_timer();
+
+again:
+ while ((signed long)(get_ccount() - next) > 0) {
+
+ profile_tick(CPU_PROFILING, regs);
+#ifndef CONFIG_SMP
+ update_process_times(user_mode(regs));
+#endif
+
+ write_seqlock(&xtime_lock);
+
+ last_ccount_stamp = next;
+ next += CCOUNT_PER_JIFFY;
+ do_timer (regs); /* Linux handler in kernel/timer.c */
+
+ if ((time_status & STA_UNSYNC) == 0 &&
+ xtime.tv_sec - last_rtc_update >= 659 &&
+ abs((xtime.tv_nsec/1000)-(1000000-1000000/HZ))<5000000/HZ &&
+ jiffies - wall_jiffies == 1) {
+
+ if (platform_set_rtc_time(xtime.tv_sec+1) == 0)
+ last_rtc_update = xtime.tv_sec+1;
+ else
+ /* Do it again in 60 s */
+ last_rtc_update += 60;
+ }
+ write_sequnlock(&xtime_lock);
+ }
+
+ /* NOTE: writing CCOMPAREn clears the interrupt. */
+
+ set_linux_timer (next);
+
+ /* Make sure we didn't miss any tick... */
+
+ if ((signed long)(get_ccount() - next) > 0)
+ goto again;
+
+ /* Allow platform to do something usefull (Wdog). */
+
+ platform_heartbeat();
+
+ return IRQ_HANDLED;
+}
+
+#ifndef CONFIG_GENERIC_CALIBRATE_DELAY
+void __devinit calibrate_delay(void)
+{
+ loops_per_jiffy = CCOUNT_PER_JIFFY;
+ printk("Calibrating delay loop (skipped)... "
+ "%lu.%02lu BogoMIPS preset\n",
+ loops_per_jiffy/(1000000/HZ),
+ (loops_per_jiffy/(10000/HZ)) % 100);
+}
+#endif
+
--- /dev/null
+/*
+ * arch/xtensa/kernel/traps.c
+ *
+ * Exception handling.
+ *
+ * Derived from code with the following copyrights:
+ * Copyright (C) 1994 - 1999 by Ralf Baechle
+ * Modified for R3000 by Paul M. Antoine, 1995, 1996
+ * Complete output from die() by Ulf Carlsson, 1998
+ * Copyright (C) 1999 Silicon Graphics, Inc.
+ *
+ * Essentially rewritten for the Xtensa architecture port.
+ *
+ * Copyright (C) 2001 - 2005 Tensilica Inc.
+ *
+ * Joe Taylor <joe@tensilica.com, joetylr@yahoo.com>
+ * Chris Zankel <chris@zankel.net>
+ * Marc Gauthier<marc@tensilica.com, marc@alumni.uwaterloo.ca>
+ * Kevin Chea
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/stringify.h>
+#include <linux/kallsyms.h>
+
+#include <asm/ptrace.h>
+#include <asm/timex.h>
+#include <asm/uaccess.h>
+#include <asm/pgtable.h>
+#include <asm/processor.h>
+
+#ifdef CONFIG_KGDB
+extern int gdb_enter;
+extern int return_from_debug_flag;
+#endif
+
+/*
+ * Machine specific interrupt handlers
+ */
+
+extern void kernel_exception(void);
+extern void user_exception(void);
+
+extern void fast_syscall_kernel(void);
+extern void fast_syscall_user(void);
+extern void fast_alloca(void);
+extern void fast_unaligned(void);
+extern void fast_second_level_miss(void);
+extern void fast_store_prohibited(void);
+extern void fast_coprocessor(void);
+
+extern void do_illegal_instruction (struct pt_regs*);
+extern void do_interrupt (struct pt_regs*);
+extern void do_unaligned_user (struct pt_regs*);
+extern void do_multihit (struct pt_regs*, unsigned long);
+extern void do_page_fault (struct pt_regs*, unsigned long);
+extern void do_debug (struct pt_regs*);
+extern void system_call (struct pt_regs*);
+
+/*
+ * The vector table must be preceded by a save area (which
+ * implies it must be in RAM, unless one places RAM immediately
+ * before a ROM and puts the vector at the start of the ROM (!))
+ */
+
+#define KRNL 0x01
+#define USER 0x02
+
+#define COPROCESSOR(x) \
+{ XCHAL_EXCCAUSE_COPROCESSOR ## x ## _DISABLED, USER, fast_coprocessor }
+
+typedef struct {
+ int cause;
+ int fast;
+ void* handler;
+} dispatch_init_table_t;
+
+dispatch_init_table_t __init dispatch_init_table[] = {
+
+{ XCHAL_EXCCAUSE_ILLEGAL_INSTRUCTION, 0, do_illegal_instruction},
+{ XCHAL_EXCCAUSE_SYSTEM_CALL, KRNL, fast_syscall_kernel },
+{ XCHAL_EXCCAUSE_SYSTEM_CALL, USER, fast_syscall_user },
+{ XCHAL_EXCCAUSE_SYSTEM_CALL, 0, system_call },
+/* XCHAL_EXCCAUSE_INSTRUCTION_FETCH unhandled */
+/* XCHAL_EXCCAUSE_LOAD_STORE_ERROR unhandled*/
+{ XCHAL_EXCCAUSE_LEVEL1_INTERRUPT, 0, do_interrupt },
+{ XCHAL_EXCCAUSE_ALLOCA, USER|KRNL, fast_alloca },
+/* XCHAL_EXCCAUSE_INTEGER_DIVIDE_BY_ZERO unhandled */
+/* XCHAL_EXCCAUSE_PRIVILEGED unhandled */
+#if XCHAL_UNALIGNED_LOAD_EXCEPTION || XCHAL_UNALIGNED_STORE_EXCEPTION
+#ifdef CONFIG_UNALIGNED_USER
+{ XCHAL_EXCCAUSE_UNALIGNED, USER, fast_unaligned },
+#else
+{ XCHAL_EXCCAUSE_UNALIGNED, 0, do_unaligned_user },
+#endif
+{ XCHAL_EXCCAUSE_UNALIGNED, KRNL, fast_unaligned },
+#endif
+{ XCHAL_EXCCAUSE_ITLB_MISS, 0, do_page_fault },
+{ XCHAL_EXCCAUSE_ITLB_MISS, USER|KRNL, fast_second_level_miss},
+{ XCHAL_EXCCAUSE_ITLB_MULTIHIT, 0, do_multihit },
+{ XCHAL_EXCCAUSE_ITLB_PRIVILEGE, 0, do_page_fault },
+/* XCHAL_EXCCAUSE_SIZE_RESTRICTION unhandled */
+{ XCHAL_EXCCAUSE_FETCH_CACHE_ATTRIBUTE, 0, do_page_fault },
+{ XCHAL_EXCCAUSE_DTLB_MISS, USER|KRNL, fast_second_level_miss},
+{ XCHAL_EXCCAUSE_DTLB_MISS, 0, do_page_fault },
+{ XCHAL_EXCCAUSE_DTLB_MULTIHIT, 0, do_multihit },
+{ XCHAL_EXCCAUSE_DTLB_PRIVILEGE, 0, do_page_fault },
+/* XCHAL_EXCCAUSE_DTLB_SIZE_RESTRICTION unhandled */
+{ XCHAL_EXCCAUSE_STORE_CACHE_ATTRIBUTE, USER|KRNL, fast_store_prohibited },
+{ XCHAL_EXCCAUSE_STORE_CACHE_ATTRIBUTE, 0, do_page_fault },
+{ XCHAL_EXCCAUSE_LOAD_CACHE_ATTRIBUTE, 0, do_page_fault },
+/* XCCHAL_EXCCAUSE_FLOATING_POINT unhandled */
+#if (XCHAL_CP_MASK & 1)
+COPROCESSOR(0),
+#endif
+#if (XCHAL_CP_MASK & 2)
+COPROCESSOR(1),
+#endif
+#if (XCHAL_CP_MASK & 4)
+COPROCESSOR(2),
+#endif
+#if (XCHAL_CP_MASK & 8)
+COPROCESSOR(3),
+#endif
+#if (XCHAL_CP_MASK & 16)
+COPROCESSOR(4),
+#endif
+#if (XCHAL_CP_MASK & 32)
+COPROCESSOR(5),
+#endif
+#if (XCHAL_CP_MASK & 64)
+COPROCESSOR(6),
+#endif
+#if (XCHAL_CP_MASK & 128)
+COPROCESSOR(7),
+#endif
+{ EXCCAUSE_MAPPED_DEBUG, 0, do_debug },
+{ -1, -1, 0 }
+
+};
+
+/* The exception table <exc_table> serves two functions:
+ * 1. it contains three dispatch tables (fast_user, fast_kernel, default-c)
+ * 2. it is a temporary memory buffer for the exception handlers.
+ */
+
+unsigned long exc_table[EXC_TABLE_SIZE/4];
+
+void die(const char*, struct pt_regs*, long);
+
+static inline void
+__die_if_kernel(const char *str, struct pt_regs *regs, long err)
+{
+ if (!user_mode(regs))
+ die(str, regs, err);
+}
+
+/*
+ * Unhandled Exceptions. Kill user task or panic if in kernel space.
+ */
+
+void do_unhandled(struct pt_regs *regs, unsigned long exccause)
+{
+ __die_if_kernel("Caught unhandled exception - should not happen",
+ regs, SIGKILL);
+
+ /* If in user mode, send SIGILL signal to current process */
+ printk("Caught unhandled exception in '%s' "
+ "(pid = %d, pc = %#010lx) - should not happen\n"
+ "\tEXCCAUSE is %ld\n",
+ current->comm, current->pid, regs->pc, exccause);
+ force_sig(SIGILL, current);
+}
+
+/*
+ * Multi-hit exception. This if fatal!
+ */
+
+void do_multihit(struct pt_regs *regs, unsigned long exccause)
+{
+ die("Caught multihit exception", regs, SIGKILL);
+}
+
+/*
+ * Level-1 interrupt.
+ * We currently have no priority encoding.
+ */
+
+unsigned long ignored_level1_interrupts;
+extern void do_IRQ(int, struct pt_regs *);
+
+void do_interrupt (struct pt_regs *regs)
+{
+ unsigned long intread = get_sr (INTREAD);
+ unsigned long intenable = get_sr (INTENABLE);
+ int i, mask;
+
+ /* Handle all interrupts (no priorities).
+ * (Clear the interrupt before processing, in case it's
+ * edge-triggered or software-generated)
+ */
+
+ for (i=0, mask = 1; i < XCHAL_NUM_INTERRUPTS; i++, mask <<= 1) {
+ if (mask & (intread & intenable)) {
+ set_sr (mask, INTCLEAR);
+ do_IRQ (i,regs);
+ }
+ }
+}
+
+/*
+ * Illegal instruction. Fatal if in kernel space.
+ */
+
+void
+do_illegal_instruction(struct pt_regs *regs)
+{
+ __die_if_kernel("Illegal instruction in kernel", regs, SIGKILL);
+
+ /* If in user mode, send SIGILL signal to current process. */
+
+ printk("Illegal Instruction in '%s' (pid = %d, pc = %#010lx)\n",
+ current->comm, current->pid, regs->pc);
+ force_sig(SIGILL, current);
+}
+
+
+/*
+ * Handle unaligned memory accesses from user space. Kill task.
+ *
+ * If CONFIG_UNALIGNED_USER is not set, we don't allow unaligned memory
+ * accesses causes from user space.
+ */
+
+#if XCHAL_UNALIGNED_LOAD_EXCEPTION || XCHAL_UNALIGNED_STORE_EXCEPTION
+#ifndef CONFIG_UNALIGNED_USER
+void
+do_unaligned_user (struct pt_regs *regs)
+{
+ siginfo_t info;
+
+ __die_if_kernel("Unhandled unaligned exception in kernel",
+ regs, SIGKILL);
+
+ current->thread.bad_vaddr = regs->excvaddr;
+ current->thread.error_code = -3;
+ printk("Unaligned memory access to %08lx in '%s' "
+ "(pid = %d, pc = %#010lx)\n",
+ regs->excvaddr, current->comm, current->pid, regs->pc);
+ info.si_signo = SIGBUS;
+ info.si_errno = 0;
+ info.si_code = BUS_ADRALN;
+ info.si_addr = (void *) regs->excvaddr;
+ force_sig_info(SIGSEGV, &info, current);
+
+}
+#endif
+#endif
+
+void
+do_debug(struct pt_regs *regs)
+{
+#ifdef CONFIG_KGDB
+ /* If remote debugging is configured AND enabled, we give control to
+ * kgdb. Otherwise, we fall through, perhaps giving control to the
+ * native debugger.
+ */
+
+ if (gdb_enter) {
+ extern void gdb_handle_exception(struct pt_regs *);
+ gdb_handle_exception(regs);
+ return_from_debug_flag = 1;
+ return;
+ }
+#endif
+
+ __die_if_kernel("Breakpoint in kernel", regs, SIGKILL);
+
+ /* If in user mode, send SIGTRAP signal to current process */
+
+ force_sig(SIGTRAP, current);
+}
+
+
+/*
+ * Initialize dispatch tables.
+ *
+ * The exception vectors are stored compressed the __init section in the
+ * dispatch_init_table. This function initializes the following three tables
+ * from that compressed table:
+ * - fast user first dispatch table for user exceptions
+ * - fast kernel first dispatch table for kernel exceptions
+ * - default C-handler C-handler called by the default fast handler.
+ *
+ * See vectors.S for more details.
+ */
+
+#define set_handler(idx,handler) (exc_table[idx] = (unsigned long) (handler))
+
+void trap_init(void)
+{
+ int i;
+
+ /* Setup default vectors. */
+
+ for(i = 0; i < 64; i++) {
+ set_handler(EXC_TABLE_FAST_USER/4 + i, user_exception);
+ set_handler(EXC_TABLE_FAST_KERNEL/4 + i, kernel_exception);
+ set_handler(EXC_TABLE_DEFAULT/4 + i, do_unhandled);
+ }
+
+ /* Setup specific handlers. */
+
+ for(i = 0; dispatch_init_table[i].cause >= 0; i++) {
+
+ int fast = dispatch_init_table[i].fast;
+ int cause = dispatch_init_table[i].cause;
+ void *handler = dispatch_init_table[i].handler;
+
+ if (fast == 0)
+ set_handler (EXC_TABLE_DEFAULT/4 + cause, handler);
+ if (fast && fast & USER)
+ set_handler (EXC_TABLE_FAST_USER/4 + cause, handler);
+ if (fast && fast & KRNL)
+ set_handler (EXC_TABLE_FAST_KERNEL/4 + cause, handler);
+ }
+
+ /* Initialize EXCSAVE_1 to hold the address of the exception table. */
+
+ i = (unsigned long)exc_table;
+ __asm__ __volatile__("wsr %0, "__stringify(EXCSAVE_1)"\n" : : "a" (i));
+}
+
+/*
+ * This function dumps the current valid window frame and other base registers.
+ */
+
+void show_regs(struct pt_regs * regs)
+{
+ int i, wmask;
+
+ wmask = regs->wmask & ~1;
+
+ for (i = 0; i < 32; i++) {
+ if (wmask & (1 << (i / 4)))
+ break;
+ if ((i % 8) == 0)
+ printk ("\n" KERN_INFO "a%02d: ", i);
+ printk("%08lx ", regs->areg[i]);
+ }
+ printk("\n");
+
+ printk("pc: %08lx, ps: %08lx, depc: %08lx, excvaddr: %08lx\n",
+ regs->pc, regs->ps, regs->depc, regs->excvaddr);
+ printk("lbeg: %08lx, lend: %08lx lcount: %08lx, sar: %08lx\n",
+ regs->lbeg, regs->lend, regs->lcount, regs->sar);
+ if (user_mode(regs))
+ printk("wb: %08lx, ws: %08lx, wmask: %08lx, syscall: %ld\n",
+ regs->windowbase, regs->windowstart, regs->wmask,
+ regs->syscall);
+}
+
+void show_trace(struct task_struct *task, unsigned long *sp)
+{
+ unsigned long a0, a1, pc;
+ unsigned long sp_start, sp_end;
+
+ a1 = (unsigned long)sp;
+
+ if (a1 == 0)
+ __asm__ __volatile__ ("mov %0, a1\n" : "=a"(a1));
+
+
+ sp_start = a1 & ~(THREAD_SIZE-1);
+ sp_end = sp_start + THREAD_SIZE;
+
+ printk("Call Trace:");
+#ifdef CONFIG_KALLSYMS
+ printk("\n");
+#endif
+ spill_registers();
+
+ while (a1 > sp_start && a1 < sp_end) {
+ sp = (unsigned long*)a1;
+
+ a0 = *(sp - 4);
+ a1 = *(sp - 3);
+
+ if (a1 <= (unsigned long) sp)
+ break;
+
+ pc = MAKE_PC_FROM_RA(a0, a1);
+
+ if (kernel_text_address(pc)) {
+ printk(" [<%08lx>] ", pc);
+ print_symbol("%s\n", pc);
+ }
+ }
+ printk("\n");
+}
+
+/*
+ * This routine abuses get_user()/put_user() to reference pointers
+ * with at least a bit of error checking ...
+ */
+
+static int kstack_depth_to_print = 24;
+
+void show_stack(struct task_struct *task, unsigned long *sp)
+{
+ int i = 0;
+ unsigned long *stack;
+
+ if (sp == 0)
+ __asm__ __volatile__ ("mov %0, a1\n" : "=a"(sp));
+
+ stack = sp;
+
+ printk("\nStack: ");
+
+ for (i = 0; i < kstack_depth_to_print; i++) {
+ if (kstack_end(sp))
+ break;
+ if (i && ((i % 8) == 0))
+ printk("\n ");
+ printk("%08lx ", *sp++);
+ }
+ printk("\n");
+ show_trace(task, stack);
+}
+
+void dump_stack(void)
+{
+ show_stack(current, NULL);
+}
+
+EXPORT_SYMBOL(dump_stack);
+
+
+void show_code(unsigned int *pc)
+{
+ long i;
+
+ printk("\nCode:");
+
+ for(i = -3 ; i < 6 ; i++) {
+ unsigned long insn;
+ if (__get_user(insn, pc + i)) {
+ printk(" (Bad address in pc)\n");
+ break;
+ }
+ printk("%c%08lx%c",(i?' ':'<'),insn,(i?' ':'>'));
+ }
+}
+
+spinlock_t die_lock = SPIN_LOCK_UNLOCKED;
+
+void die(const char * str, struct pt_regs * regs, long err)
+{
+ static int die_counter;
+ int nl = 0;
+
+ console_verbose();
+ spin_lock_irq(&die_lock);
+
+ printk("%s: sig: %ld [#%d]\n", str, err, ++die_counter);
+#ifdef CONFIG_PREEMPT
+ printk("PREEMPT ");
+ nl = 1;
+#endif
+ if (nl)
+ printk("\n");
+ show_regs(regs);
+ if (!user_mode(regs))
+ show_stack(NULL, (unsigned long*)regs->areg[1]);
+
+ spin_unlock_irq(&die_lock);
+
+ if (in_interrupt())
+ panic("Fatal exception in interrupt");
+
+ if (panic_on_oops) {
+ printk(KERN_EMERG "Fatal exception: panic in 5 seconds\n");
+ set_current_state(TASK_UNINTERRUPTIBLE);
+ schedule_timeout(5 * HZ);
+ panic("Fatal exception");
+ }
+ do_exit(err);
+}
+
+
--- /dev/null
+/*
+ * arch/xtensa/kernel/vectors.S
+ *
+ * This file contains all exception vectors (user, kernel, and double),
+ * as well as the window vectors (overflow and underflow), and the debug
+ * vector. These are the primary vectors executed by the processor if an
+ * exception occurs.
+ *
+ * This file is subject to the terms and conditions of the GNU General
+ * Public License. See the file "COPYING" in the main directory of
+ * this archive for more details.
+ *
+ * Copyright (C) 2005 Tensilica, Inc.
+ *
+ * Chris Zankel <chris@zankel.net>
+ *
+ */
+
+/*
+ * We use a two-level table approach. The user and kernel exception vectors
+ * use a first-level dispatch table to dispatch the exception to a registered
+ * fast handler or the default handler, if no fast handler was registered.
+ * The default handler sets up a C-stack and dispatches the exception to a
+ * registerd C handler in the second-level dispatch table.
+ *
+ * Fast handler entry condition:
+ *
+ * a0: trashed, original value saved on stack (PT_AREG0)
+ * a1: a1
+ * a2: new stack pointer, original value in depc
+ * a3: dispatch table
+ * depc: a2, original value saved on stack (PT_DEPC)
+ * excsave_1: a3
+ *
+ * The value for PT_DEPC saved to stack also functions as a boolean to
+ * indicate that the exception is either a double or a regular exception:
+ *
+ * PT_DEPC >= VALID_DOUBLE_EXCEPTION_ADDRESS: double exception
+ * < VALID_DOUBLE_EXCEPTION_ADDRESS: regular exception
+ *
+ * Note: Neither the kernel nor the user exception handler generate literals.
+ *
+ */
+
+#include <linux/linkage.h>
+#include <asm/ptrace.h>
+#include <asm/ptrace.h>
+#include <asm/current.h>
+#include <asm/offsets.h>
+#include <asm/pgtable.h>
+#include <asm/processor.h>
+#include <asm/page.h>
+#include <asm/thread_info.h>
+#include <asm/processor.h>
+
+
+/*
+ * User exception vector. (Exceptions with PS.UM == 1, PS.EXCM == 0)
+ *
+ * We get here when an exception occurred while we were in userland.
+ * We switch to the kernel stack and jump to the first level handler
+ * associated to the exception cause.
+ *
+ * Note: the saved kernel stack pointer (EXC_TABLE_KSTK) is already
+ * decremented by PT_USER_SIZE.
+ */
+
+ .section .UserExceptionVector.text, "ax"
+
+ENTRY(_UserExceptionVector)
+
+ xsr a3, EXCSAVE_1 # save a3 and get dispatch table
+ wsr a2, DEPC # save a2
+ l32i a2, a3, EXC_TABLE_KSTK # load kernel stack to a2
+ s32i a0, a2, PT_AREG0 # save a0 to ESF
+ rsr a0, EXCCAUSE # retrieve exception cause
+ s32i a0, a2, PT_DEPC # mark it as a regular exception
+ addx4 a0, a0, a3 # find entry in table
+ l32i a0, a0, EXC_TABLE_FAST_USER # load handler
+ jx a0
+
+/*
+ * Kernel exception vector. (Exceptions with PS.UM == 0, PS.EXCM == 0)
+ *
+ * We get this exception when we were already in kernel space.
+ * We decrement the current stack pointer (kernel) by PT_SIZE and
+ * jump to the first-level handler associated with the exception cause.
+ *
+ * Note: we need to preserve space for the spill region.
+ */
+
+ .section .KernelExceptionVector.text, "ax"
+
+ENTRY(_KernelExceptionVector)
+
+ xsr a3, EXCSAVE_1 # save a3, and get dispatch table
+ wsr a2, DEPC # save a2
+ addi a2, a1, -16-PT_SIZE # adjust stack pointer
+ s32i a0, a2, PT_AREG0 # save a0 to ESF
+ rsr a0, EXCCAUSE # retrieve exception cause
+ s32i a0, a2, PT_DEPC # mark it as a regular exception
+ addx4 a0, a0, a3 # find entry in table
+ l32i a0, a0, EXC_TABLE_FAST_KERNEL # load handler address
+ jx a0
+
+
+/*
+ * Double exception vector (Exceptions with PS.EXCM == 1)
+ * We get this exception when another exception occurs while were are
+ * already in an exception, such as window overflow/underflow exception,
+ * or 'expected' exceptions, for example memory exception when we were trying
+ * to read data from an invalid address in user space.
+ *
+ * Note that this vector is never invoked for level-1 interrupts, because such
+ * interrupts are disabled (masked) when PS.EXCM is set.
+ *
+ * We decode the exception and take the appropriate action. However, the
+ * double exception vector is much more careful, because a lot more error
+ * cases go through the double exception vector than through the user and
+ * kernel exception vectors.
+ *
+ * Occasionally, the kernel expects a double exception to occur. This usually
+ * happens when accessing user-space memory with the user's permissions
+ * (l32e/s32e instructions). The kernel state, though, is not always suitable
+ * for immediate transfer of control to handle_double, where "normal" exception
+ * processing occurs. Also in kernel mode, TLB misses can occur if accessing
+ * vmalloc memory, possibly requiring repair in a double exception handler.
+ *
+ * The variable at TABLE_FIXUP offset from the pointer in EXCSAVE_1 doubles as
+ * a boolean variable and a pointer to a fixup routine. If the variable
+ * EXC_TABLE_FIXUP is non-zero, this handler jumps to that address. A value of
+ * zero indicates to use the default kernel/user exception handler.
+ * There is only one exception, when the value is identical to the exc_table
+ * label, the kernel is in trouble. This mechanism is used to protect critical
+ * sections, mainly when the handler writes to the stack to assert the stack
+ * pointer is valid. Once the fixup/default handler leaves that area, the
+ * EXC_TABLE_FIXUP variable is reset to the fixup handler or zero.
+ *
+ * Procedures wishing to use this mechanism should set EXC_TABLE_FIXUP to the
+ * nonzero address of a fixup routine before it could cause a double exception
+ * and reset it before it returns.
+ *
+ * Some other things to take care of when a fast exception handler doesn't
+ * specify a particular fixup handler but wants to use the default handlers:
+ *
+ * - The original stack pointer (in a1) must not be modified. The fast
+ * exception handler should only use a2 as the stack pointer.
+ *
+ * - If the fast handler manipulates the stack pointer (in a2), it has to
+ * register a valid fixup handler and cannot use the default handlers.
+ *
+ * - The handler can use any other generic register from a3 to a15, but it
+ * must save the content of these registers to stack (PT_AREG3...PT_AREGx)
+ *
+ * - These registers must be saved before a double exception can occur.
+ *
+ * - If we ever implement handling signals while in double exceptions, the
+ * number of registers a fast handler has saved (excluding a0 and a1) must
+ * be written to PT_AREG1. (1 if only a3 is used, 2 for a3 and a4, etc. )
+ *
+ * The fixup handlers are special handlers:
+ *
+ * - Fixup entry conditions differ from regular exceptions:
+ *
+ * a0: DEPC
+ * a1: a1
+ * a2: trashed, original value in EXC_TABLE_DOUBLE_A2
+ * a3: exctable
+ * depc: a0
+ * excsave_1: a3
+ *
+ * - When the kernel enters the fixup handler, it still assumes it is in a
+ * critical section, so EXC_TABLE_FIXUP variable is set to exc_table.
+ * The fixup handler, therefore, has to re-register itself as the fixup
+ * handler before it returns from the double exception.
+ *
+ * - Fixup handler can share the same exception frame with the fast handler.
+ * The kernel stack pointer is not changed when entering the fixup handler.
+ *
+ * - Fixup handlers can jump to the default kernel and user exception
+ * handlers. Before it jumps, though, it has to setup a exception frame
+ * on stack. Because the default handler resets the register fixup handler
+ * the fixup handler must make sure that the default handler returns to
+ * it instead of the exception address, so it can re-register itself as
+ * the fixup handler.
+ *
+ * In case of a critical condition where the kernel cannot recover, we jump
+ * to unrecoverable_exception with the following entry conditions.
+ * All registers a0...a15 are unchanged from the last exception, except:
+ *
+ * a0: last address before we jumped to the unrecoverable_exception.
+ * excsave_1: a0
+ *
+ *
+ * See the handle_alloca_user and spill_registers routines for example clients.
+ *
+ * FIXME: Note: we currently don't allow signal handling coming from a double
+ * exception, so the item markt with (*) is not required.
+ */
+
+ .section .DoubleExceptionVector.text, "ax"
+ .begin literal_prefix .DoubleExceptionVector
+
+ENTRY(_DoubleExceptionVector)
+
+ /* Deliberately destroy excsave (don't assume it's value was valid). */
+
+ wsr a3, EXCSAVE_1 # save a3
+
+ /* Check for kernel double exception (usually fatal). */
+
+ rsr a3, PS
+ _bbci.l a3, PS_UM_SHIFT, .Lksp
+
+ /* Check if we are currently handling a window exception. */
+ /* Note: We don't need to indicate that we enter a critical section. */
+
+ xsr a0, DEPC # get DEPC, save a0
+
+ movi a3, XCHAL_WINDOW_VECTORS_VADDR
+ _bltu a0, a3, .Lfixup
+ addi a3, a3, XSHAL_WINDOW_VECTORS_SIZE
+ _bgeu a0, a3, .Lfixup
+
+ /* Window overflow/underflow exception. Get stack pointer. */
+
+ mov a3, a2
+ movi a2, exc_table
+ l32i a2, a2, EXC_TABLE_KSTK
+
+ /* Check for overflow/underflow exception, jump if overflow. */
+
+ _bbci.l a0, 6, .Lovfl
+
+ /* a0: depc, a1: a1, a2: kstk, a3: a2, depc: a0, excsave: a3 */
+
+ /* Restart window underflow exception.
+ * We return to the instruction in user space that caused the window
+ * underflow exception. Therefore, we change window base to the value
+ * before we entered the window underflow exception and prepare the
+ * registers to return as if we were coming from a regular exception
+ * by changing depc (in a0).
+ * Note: We can trash the current window frame (a0...a3) and depc!
+ */
+
+ wsr a2, DEPC # save stack pointer temporarily
+ rsr a0, PS
+ extui a0, a0, XCHAL_PS_OWB_SHIFT, XCHAL_PS_OWB_BITS
+ wsr a0, WINDOWBASE
+ rsync
+
+ /* We are now in the previous window frame. Save registers again. */
+
+ xsr a2, DEPC # save a2 and get stack pointer
+ s32i a0, a2, PT_AREG0
+
+ wsr a3, EXCSAVE_1 # save a3
+ movi a3, exc_table
+
+ rsr a0, EXCCAUSE
+ s32i a0, a2, PT_DEPC # mark it as a regular exception
+ addx4 a0, a0, a3
+ l32i a0, a0, EXC_TABLE_FAST_USER
+ jx a0
+
+.Lfixup:/* Check for a fixup handler or if we were in a critical section. */
+
+ /* a0: depc, a1: a1, a2: a2, a3: trashed, depc: a0, excsave1: a3 */
+
+ movi a3, exc_table
+ s32i a2, a3, EXC_TABLE_DOUBLE_SAVE # temporary variable
+
+ /* Enter critical section. */
+
+ l32i a2, a3, EXC_TABLE_FIXUP
+ s32i a3, a3, EXC_TABLE_FIXUP
+ beq a2, a3, .Lunrecoverable_fixup # critical!
+ beqz a2, .Ldflt # no handler was registered
+
+ /* a0: depc, a1: a1, a2: trash, a3: exctable, depc: a0, excsave: a3 */
+
+ jx a2
+
+.Ldflt: /* Get stack pointer. */
+
+ l32i a3, a3, EXC_TABLE_DOUBLE_SAVE
+ addi a2, a3, -PT_USER_SIZE
+
+.Lovfl: /* Jump to default handlers. */
+
+ /* a0: depc, a1: a1, a2: kstk, a3: a2, depc: a0, excsave: a3 */
+
+ xsr a3, DEPC
+ s32i a0, a2, PT_DEPC
+ s32i a3, a2, PT_AREG0
+
+ /* a0: avail, a1: a1, a2: kstk, a3: avail, depc: a2, excsave: a3 */
+
+ movi a3, exc_table
+ rsr a0, EXCCAUSE
+ addx4 a0, a0, a3
+ l32i a0, a0, EXC_TABLE_FAST_USER
+ jx a0
+
+ /*
+ * We only allow the ITLB miss exception if we are in kernel space.
+ * All other exceptions are unexpected and thus unrecoverable!
+ */
+
+ .extern fast_second_level_miss_double_kernel
+
+.Lksp: /* a0: a0, a1: a1, a2: a2, a3: trashed, depc: depc, excsave: a3 */
+
+ rsr a3, EXCCAUSE
+ beqi a3, XCHAL_EXCCAUSE_ITLB_MISS, 1f
+ addi a3, a3, -XCHAL_EXCCAUSE_DTLB_MISS
+ bnez a3, .Lunrecoverable
+1: movi a3, fast_second_level_miss_double_kernel
+ jx a3
+
+ /* Critical! We can't handle this situation. PANIC! */
+
+ .extern unrecoverable_exception
+
+.Lunrecoverable_fixup:
+ l32i a2, a3, EXC_TABLE_DOUBLE_SAVE
+ xsr a0, DEPC
+
+.Lunrecoverable:
+ rsr a3, EXCSAVE_1
+ wsr a0, EXCSAVE_1
+ movi a0, unrecoverable_exception
+ callx0 a0
+
+ .end literal_prefix
+
+
+/*
+ * Debug interrupt vector
+ *
+ * There is not much space here, so simply jump to another handler.
+ * EXCSAVE[DEBUGLEVEL] has been set to that handler.
+ */
+
+ .section .DebugInterruptVector.text, "ax"
+
+ENTRY(_DebugInterruptVector)
+ xsr a0, EXCSAVE + XCHAL_DEBUGLEVEL
+ jx a0
+
+
+
+/* Window overflow and underflow handlers.
+ * The handlers must be 64 bytes apart, first starting with the underflow
+ * handlers underflow-4 to underflow-12, then the overflow handlers
+ * overflow-4 to overflow-12.
+ *
+ * Note: We rerun the underflow handlers if we hit an exception, so
+ * we try to access any page that would cause a page fault early.
+ */
+
+ .section .WindowVectors.text, "ax"
+
+
+/* 4-Register Window Overflow Vector (Handler) */
+
+ .align 64
+.global _WindowOverflow4
+_WindowOverflow4:
+ s32e a0, a5, -16
+ s32e a1, a5, -12
+ s32e a2, a5, -8
+ s32e a3, a5, -4
+ rfwo
+
+
+/* 4-Register Window Underflow Vector (Handler) */
+
+ .align 64
+.global _WindowUnderflow4
+_WindowUnderflow4:
+ l32e a0, a5, -16
+ l32e a1, a5, -12
+ l32e a2, a5, -8
+ l32e a3, a5, -4
+ rfwu
+
+
+/* 8-Register Window Overflow Vector (Handler) */
+
+ .align 64
+.global _WindowOverflow8
+_WindowOverflow8:
+ s32e a0, a9, -16
+ l32e a0, a1, -12
+ s32e a2, a9, -8
+ s32e a1, a9, -12
+ s32e a3, a9, -4
+ s32e a4, a0, -32
+ s32e a5, a0, -28
+ s32e a6, a0, -24
+ s32e a7, a0, -20
+ rfwo
+
+/* 8-Register Window Underflow Vector (Handler) */
+
+ .align 64
+.global _WindowUnderflow8
+_WindowUnderflow8:
+ l32e a1, a9, -12
+ l32e a0, a9, -16
+ l32e a7, a1, -12
+ l32e a2, a9, -8
+ l32e a4, a7, -32
+ l32e a3, a9, -4
+ l32e a5, a7, -28
+ l32e a6, a7, -24
+ l32e a7, a7, -20
+ rfwu
+
+
+/* 12-Register Window Overflow Vector (Handler) */
+
+ .align 64
+.global _WindowOverflow12
+_WindowOverflow12:
+ s32e a0, a13, -16
+ l32e a0, a1, -12
+ s32e a1, a13, -12
+ s32e a2, a13, -8
+ s32e a3, a13, -4
+ s32e a4, a0, -48
+ s32e a5, a0, -44
+ s32e a6, a0, -40
+ s32e a7, a0, -36
+ s32e a8, a0, -32
+ s32e a9, a0, -28
+ s32e a10, a0, -24
+ s32e a11, a0, -20
+ rfwo
+
+/* 12-Register Window Underflow Vector (Handler) */
+
+ .align 64
+.global _WindowUnderflow12
+_WindowUnderflow12:
+ l32e a1, a13, -12
+ l32e a0, a13, -16
+ l32e a11, a1, -12
+ l32e a2, a13, -8
+ l32e a4, a11, -48
+ l32e a8, a11, -32
+ l32e a3, a13, -4
+ l32e a5, a11, -44
+ l32e a6, a11, -40
+ l32e a7, a11, -36
+ l32e a9, a11, -28
+ l32e a10, a11, -24
+ l32e a11, a11, -20
+ rfwu
+
+ .text
+
+
--- /dev/null
+/*
+ * arch/xtensa/kernel/vmlinux.lds.S
+ *
+ * Xtensa linker script
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2001 - 2005 Tensilica Inc.
+ *
+ * Chris Zankel <chris@zankel.net>
+ * Marc Gauthier <marc@tensilica.com, marc@alumni.uwaterloo.ca>
+ * Joe Taylor <joe@tensilica.com, joetylr@yahoo.com>
+ */
+
+#include <asm-generic/vmlinux.lds.h>
+
+#include <linux/config.h>
+#define _NOCLANGUAGE
+#include <xtensa/config/core.h>
+#include <xtensa/config/system.h>
+OUTPUT_ARCH(xtensa)
+ENTRY(_start)
+
+#if XCHAL_MEMORY_ORDER == XTHAL_BIGENDIAN
+jiffies = jiffies_64 + 4;
+#else
+jiffies = jiffies_64;
+#endif
+
+#define KERNELOFFSET 0x1000
+
+/* Note: In the following macros, it would be nice to specify only the
+ vector name and section kind and construct "sym" and "section" using
+ CPP concatenation, but that does not work reliably. Concatenating a
+ string with "." produces an invalid token. CPP will not print a
+ warning because it thinks this is an assembly file, but it leaves
+ them as multiple tokens and there may or may not be whitespace
+ between them. */
+
+/* Macro for a relocation entry */
+
+#define RELOCATE_ENTRY(sym, section) \
+ LONG(sym ## _start); \
+ LONG(sym ## _end); \
+ LONG(LOADADDR(section))
+
+/* Macro to define a section for a vector.
+ *
+ * Use of the MIN function catches the types of errors illustrated in
+ * the following example:
+ *
+ * Assume the section .DoubleExceptionVector.literal is completely
+ * full. Then a programmer adds code to .DoubleExceptionVector.text
+ * that produces another literal. The final literal position will
+ * overlay onto the first word of the adjacent code section
+ * .DoubleExceptionVector.text. (In practice, the literals will
+ * overwrite the code, and the first few instructions will be
+ * garbage.)
+ */
+
+#define SECTION_VECTOR(sym, section, addr, max_prevsec_size, prevsec) \
+ section addr : AT((MIN(LOADADDR(prevsec) + max_prevsec_size, \
+ LOADADDR(prevsec) + SIZEOF(prevsec)) + 3) & ~ 3) \
+ { \
+ . = ALIGN(4); \
+ sym ## _start = ABSOLUTE(.); \
+ *(section) \
+ sym ## _end = ABSOLUTE(.); \
+ }
+
+/*
+ * Mapping of input sections to output sections when linking.
+ */
+
+SECTIONS
+{
+ . = XCHAL_KSEG_CACHED_VADDR + KERNELOFFSET;
+ /* .text section */
+
+ _text = .;
+ _stext = .;
+ _ftext = .;
+
+ .text :
+ {
+ /* The .head.text section must be the first section! */
+ *(.head.text)
+ *(.literal .text)
+ *(.srom.text)
+ VMLINUX_SYMBOL(__sched_text_start) = .;
+ *(.sched.text.literal .sched.text)
+ VMLINUX_SYMBOL(__sched_text_end) = .;
+ VMLINUX_SYMBOL(__lock_text_start) = .;
+ *(.spinlock.text.literal .spinlock.text)
+ VMLINUX_SYMBOL(__lock_text_end) = .;
+
+ }
+ _etext = .;
+
+ . = ALIGN(16);
+
+ RODATA
+
+ /* Relocation table */
+
+ . = ALIGN(16);
+ __boot_reloc_table_start = ABSOLUTE(.);
+
+ __relocate : {
+
+ RELOCATE_ENTRY(_WindowVectors_text,
+ .WindowVectors.text);
+#if 0
+ RELOCATE_ENTRY(_KernelExceptionVector_literal,
+ .KernelExceptionVector.literal);
+#endif
+ RELOCATE_ENTRY(_KernelExceptionVector_text,
+ .KernelExceptionVector.text);
+#if 0
+ RELOCATE_ENTRY(_UserExceptionVector_literal,
+ .UserExceptionVector.literal);
+#endif
+ RELOCATE_ENTRY(_UserExceptionVector_text,
+ .UserExceptionVector.text);
+ RELOCATE_ENTRY(_DoubleExceptionVector_literal,
+ .DoubleExceptionVector.literal);
+ RELOCATE_ENTRY(_DoubleExceptionVector_text,
+ .DoubleExceptionVector.text);
+ }
+ __boot_reloc_table_end = ABSOLUTE(.) ;
+
+ .fixup : { *(.fixup) }
+
+ . = ALIGN(16);
+
+ __ex_table : {
+ __start___ex_table = .;
+ *(__ex_table)
+ __stop___ex_table = .;
+ }
+
+ /* Data section */
+
+ . = ALIGN(XCHAL_ICACHE_LINESIZE);
+ _fdata = .;
+ .data :
+ {
+ *(.data) CONSTRUCTORS
+ . = ALIGN(XCHAL_ICACHE_LINESIZE);
+ *(.data.cacheline_aligned)
+ }
+
+ _edata = .;
+
+ /* The initial task */
+ . = ALIGN(8192);
+ .data.init_task : { *(.data.init_task) }
+
+ /* Initialization code and data: */
+
+ . = ALIGN(1<<XCHAL_MMU_MIN_PTE_PAGE_SIZE);
+ __init_begin = .;
+ .init.text : {
+ _sinittext = .;
+ *(.init.text.literal) *(.init.text)
+ _einittext = .;
+ }
+
+ .init.data :
+ {
+ *(.init.data)
+ . = ALIGN(0x4);
+ __tagtable_begin = .;
+ *(.taglist)
+ __tagtable_end = .;
+ }
+
+ . = ALIGN(XCHAL_ICACHE_LINESIZE);
+
+ __setup_start = .;
+ .init.setup : { *(.init.setup) }
+ __setup_end = .;
+
+ __initcall_start = .;
+ .initcall.init : {
+ *(.initcall1.init)
+ *(.initcall2.init)
+ *(.initcall3.init)
+ *(.initcall4.init)
+ *(.initcall5.init)
+ *(.initcall6.init)
+ *(.initcall7.init)
+ }
+ __initcall_end = .;
+
+ __con_initcall_start = .;
+ .con_initcall.init : { *(.con_initcall.init) }
+ __con_initcall_end = .;
+
+ SECURITY_INIT
+
+ . = ALIGN(4);
+
+ __start___ftr_fixup = .;
+ __ftr_fixup : { *(__ftr_fixup) }
+ __stop___ftr_fixup = .;
+
+ . = ALIGN(32);
+ __per_cpu_start = .;
+ .data.percpu : { *(.data.percpu) }
+ __per_cpu_end = .;
+
+ . = ALIGN(4096);
+ __initramfs_start =.;
+ .init.ramfs : { *(.init.ramfs) }
+ __initramfs_end = .;
+
+ /* We need this dummy segment here */
+
+ . = ALIGN(4);
+ .dummy : { LONG(0) }
+
+ /* The vectors are relocated to the real position at startup time */
+
+ SECTION_VECTOR (_WindowVectors_text,
+ .WindowVectors.text,
+ XCHAL_WINDOW_VECTORS_VADDR, 4,
+ .dummy)
+ SECTION_VECTOR (_DebugInterruptVector_literal,
+ .DebugInterruptVector.literal,
+ XCHAL_INTLEVEL_VECTOR_VADDR(XCHAL_DEBUGLEVEL) - 4,
+ SIZEOF(.WindowVectors.text),
+ .WindowVectors.text)
+ SECTION_VECTOR (_DebugInterruptVector_text,
+ .DebugInterruptVector.text,
+ XCHAL_INTLEVEL_VECTOR_VADDR(XCHAL_DEBUGLEVEL),
+ 4,
+ .DebugInterruptVector.literal)
+ SECTION_VECTOR (_KernelExceptionVector_literal,
+ .KernelExceptionVector.literal,
+ XCHAL_KERNELEXC_VECTOR_VADDR - 4,
+ SIZEOF(.DebugInterruptVector.text),
+ .DebugInterruptVector.text)
+ SECTION_VECTOR (_KernelExceptionVector_text,
+ .KernelExceptionVector.text,
+ XCHAL_KERNELEXC_VECTOR_VADDR,
+ 4,
+ .KernelExceptionVector.literal)
+ SECTION_VECTOR (_UserExceptionVector_literal,
+ .UserExceptionVector.literal,
+ XCHAL_USEREXC_VECTOR_VADDR - 4,
+ SIZEOF(.KernelExceptionVector.text),
+ .KernelExceptionVector.text)
+ SECTION_VECTOR (_UserExceptionVector_text,
+ .UserExceptionVector.text,
+ XCHAL_USEREXC_VECTOR_VADDR,
+ 4,
+ .UserExceptionVector.literal)
+ SECTION_VECTOR (_DoubleExceptionVector_literal,
+ .DoubleExceptionVector.literal,
+ XCHAL_DOUBLEEXC_VECTOR_VADDR - 16,
+ SIZEOF(.UserExceptionVector.text),
+ .UserExceptionVector.text)
+ SECTION_VECTOR (_DoubleExceptionVector_text,
+ .DoubleExceptionVector.text,
+ XCHAL_DOUBLEEXC_VECTOR_VADDR,
+ 32,
+ .DoubleExceptionVector.literal)
+
+ . = (LOADADDR( .DoubleExceptionVector.text ) + SIZEOF( .DoubleExceptionVector.text ) + 3) & ~ 3;
+ . = ALIGN(1<<XCHAL_MMU_MIN_PTE_PAGE_SIZE);
+
+ __init_end = .;
+
+ . = ALIGN(8192);
+
+ /* BSS section */
+ _bss_start = .;
+ .sbss : { *(.sbss) *(.scommon) }
+ .bss : { *(COMMON) *(.bss) }
+ _bss_end = .;
+ _end = .;
+
+ /* only used by the boot loader */
+
+ . = ALIGN(0x10);
+ .bootstrap : { *(.bootstrap.literal .bootstrap.text .bootstrap.data) }
+
+ . = ALIGN(0x1000);
+ __initrd_start = .;
+ .initrd : { *(.initrd) }
+ __initrd_end = .;
+
+ .ResetVector.text XCHAL_RESET_VECTOR_VADDR :
+ {
+ *(.ResetVector.text)
+ }
+
+
+ /* Sections to be discarded */
+ /DISCARD/ :
+ {
+ *(.text.exit)
+ *(.text.exit.literal)
+ *(.data.exit)
+ *(.exitcall.exit)
+ }
+
+
+ .debug 0 : { *(.debug) }
+ .line 0 : { *(.line) }
+ .debug_srcinfo 0 : { *(.debug_srcinfo) }
+ .debug_sfnames 0 : { *(.debug_sfnames) }
+ .debug_aranges 0 : { *(.debug_aranges) }
+ .debug_pubnames 0 : { *(.debug_pubnames) }
+ .debug_info 0 : { *(.debug_info) }
+ .debug_abbrev 0 : { *(.debug_abbrev) }
+ .debug_line 0 : { *(.debug_line) }
+ .debug_frame 0 : { *(.debug_frame) }
+ .debug_str 0 : { *(.debug_str) }
+ .debug_loc 0 : { *(.debug_loc) }
+ .debug_macinfo 0 : { *(.debug_macinfo) }
+ .debug_weaknames 0 : { *(.debug_weaknames) }
+ .debug_funcnames 0 : { *(.debug_funcnames) }
+ .debug_typenames 0 : { *(.debug_typenames) }
+ .debug_varnames 0 : { *(.debug_varnames) }
+
+ .xt.insn 0 :
+ {
+ *(.xt.insn)
+ *(.gnu.linkonce.x*)
+ }
+
+ .xt.lit 0 :
+ {
+ *(.xt.lit)
+ *(.gnu.linkonce.p*)
+ }
+}
--- /dev/null
+/*
+ * arch/xtensa/kernel/xtensa_ksyms.c
+ *
+ * Export Xtensa-specific functions for loadable modules.
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2001 - 2005 Tensilica Inc.
+ *
+ * Joe Taylor <joe@tensilica.com>
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/string.h>
+#include <linux/mm.h>
+#include <linux/interrupt.h>
+#include <asm/irq.h>
+#include <linux/in6.h>
+#include <linux/pci.h>
+#include <linux/ide.h>
+
+#include <asm/uaccess.h>
+#include <asm/checksum.h>
+#include <asm/dma.h>
+#include <asm/io.h>
+#include <asm/page.h>
+#include <asm/pgalloc.h>
+#include <asm/semaphore.h>
+#ifdef CONFIG_BLK_DEV_FD
+#include <asm/floppy.h>
+#endif
+#ifdef CONFIG_NET
+#include <net/checksum.h>
+#endif /* CONFIG_NET */
+
+
+/*
+ * String functions
+ */
+EXPORT_SYMBOL(memcmp);
+EXPORT_SYMBOL(memset);
+EXPORT_SYMBOL(memcpy);
+EXPORT_SYMBOL(memmove);
+EXPORT_SYMBOL(memchr);
+EXPORT_SYMBOL(strcat);
+EXPORT_SYMBOL(strchr);
+EXPORT_SYMBOL(strlen);
+EXPORT_SYMBOL(strpbrk);
+EXPORT_SYMBOL(strncat);
+EXPORT_SYMBOL(strnlen);
+EXPORT_SYMBOL(strrchr);
+EXPORT_SYMBOL(strstr);
+
+EXPORT_SYMBOL(enable_irq);
+EXPORT_SYMBOL(disable_irq);
+EXPORT_SYMBOL(kernel_thread);
+
+/*
+ * gcc internal math functions
+ */
+extern long long __ashrdi3(long long, int);
+extern long long __ashldi3(long long, int);
+extern long long __lshrdi3(long long, int);
+extern int __divsi3(int, int);
+extern int __modsi3(int, int);
+extern long long __muldi3(long long, long long);
+extern int __mulsi3(int, int);
+extern unsigned int __udivsi3(unsigned int, unsigned int);
+extern unsigned int __umodsi3(unsigned int, unsigned int);
+extern unsigned long long __umoddi3(unsigned long long, unsigned long long);
+extern unsigned long long __udivdi3(unsigned long long, unsigned long long);
+
+EXPORT_SYMBOL(__ashldi3);
+EXPORT_SYMBOL(__ashrdi3);
+EXPORT_SYMBOL(__lshrdi3);
+EXPORT_SYMBOL(__divsi3);
+EXPORT_SYMBOL(__modsi3);
+EXPORT_SYMBOL(__muldi3);
+EXPORT_SYMBOL(__mulsi3);
+EXPORT_SYMBOL(__udivsi3);
+EXPORT_SYMBOL(__umodsi3);
+EXPORT_SYMBOL(__udivdi3);
+EXPORT_SYMBOL(__umoddi3);
+
+/*
+ * Semaphore operations
+ */
+EXPORT_SYMBOL(__down);
+EXPORT_SYMBOL(__down_interruptible);
+EXPORT_SYMBOL(__down_trylock);
+EXPORT_SYMBOL(__up);
+
+#ifdef CONFIG_NET
+/*
+ * Networking support
+ */
+EXPORT_SYMBOL(csum_partial_copy_generic);
+#endif /* CONFIG_NET */
+
+/*
+ * Architecture-specific symbols
+ */
+EXPORT_SYMBOL(__xtensa_copy_user);
+
+/*
+ * Kernel hacking ...
+ */
+
+#if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
+// FIXME EXPORT_SYMBOL(screen_info);
+#endif
+
+EXPORT_SYMBOL(get_wchan);
+
+EXPORT_SYMBOL(outsb);
+EXPORT_SYMBOL(outsw);
+EXPORT_SYMBOL(outsl);
+EXPORT_SYMBOL(insb);
+EXPORT_SYMBOL(insw);
+EXPORT_SYMBOL(insl);
projects / linux-2.6 / commitdiff