2 * linux/arch/m32r/kernel/entry.S
4 * Copyright (c) 2001, 2002 Hirokazu Takata, Hitoshi Yamamoto, H. Kondo
5 * Copyright (c) 2003 Hitoshi Yamamoto
6 * Copyright (c) 2004 Hirokazu Takata <takata at linux-m32r.org>
8 * Taken from i386 version.
9 * Copyright (C) 1991, 1992 Linus Torvalds
13 * entry.S contains the system-call and fault low-level handling routines.
14 * This also contains the timer-interrupt handler, as well as all interrupts
15 * and faults that can result in a task-switch.
17 * NOTE: This code handles signal-recognition, which happens every time
18 * after a timer-interrupt and after each system call.
20 * Stack layout in 'ret_from_system_call':
21 * ptrace needs to have all regs on the stack.
22 * if the order here is changed, it needs to be
23 * updated in fork.c:copy_thread, signal.c:do_signal,
24 * ptrace.c and ptrace.h
30 * @(0x0c,sp) - *pt_regs
41 * @(0x38,sp) - syscall_nr
44 * @(0x44,sp) - acc1h ; ISA_DSP_LEVEL2 only
45 * @(0x48,sp) - acc1l ; ISA_DSP_LEVEL2 only
50 * @(0x5c,sp) - spu (cr3)
51 * @(0x60,sp) - fp (r13)
52 * @(0x64,sp) - lr (r14)
53 * @(0x68,sp) - spi (cr2)
54 * @(0x6c,sp) - orig_r0
57 #include <linux/linkage.h>
59 #include <asm/unistd.h>
60 #include <asm/assembler.h>
61 #include <asm/thread_info.h>
62 #include <asm/errno.h>
63 #include <asm/segment.h>
67 #include <asm/mmu_context.h>
69 #if !defined(CONFIG_MMU)
70 #define sys_madvise sys_ni_syscall
71 #define sys_readahead sys_ni_syscall
72 #define sys_mprotect sys_ni_syscall
73 #define sys_msync sys_ni_syscall
74 #define sys_mlock sys_ni_syscall
75 #define sys_munlock sys_ni_syscall
76 #define sys_mlockall sys_ni_syscall
77 #define sys_munlockall sys_ni_syscall
78 #define sys_mremap sys_ni_syscall
79 #define sys_mincore sys_ni_syscall
80 #define sys_remap_file_pages sys_ni_syscall
81 #endif /* CONFIG_MMU */
84 #define R5(reg) @(0x04,reg)
85 #define R6(reg) @(0x08,reg)
86 #define PTREGS(reg) @(0x0C,reg)
87 #define R0(reg) @(0x10,reg)
88 #define R1(reg) @(0x14,reg)
89 #define R2(reg) @(0x18,reg)
90 #define R3(reg) @(0x1C,reg)
91 #define R7(reg) @(0x20,reg)
92 #define R8(reg) @(0x24,reg)
93 #define R9(reg) @(0x28,reg)
94 #define R10(reg) @(0x2C,reg)
95 #define R11(reg) @(0x30,reg)
96 #define R12(reg) @(0x34,reg)
97 #define SYSCALL_NR(reg) @(0x38,reg)
98 #define ACC0H(reg) @(0x3C,reg)
99 #define ACC0L(reg) @(0x40,reg)
100 #define ACC1H(reg) @(0x44,reg)
101 #define ACC1L(reg) @(0x48,reg)
102 #define PSW(reg) @(0x4C,reg)
103 #define BPC(reg) @(0x50,reg)
104 #define BBPSW(reg) @(0x54,reg)
105 #define BBPC(reg) @(0x58,reg)
106 #define SPU(reg) @(0x5C,reg)
107 #define FP(reg) @(0x60,reg) /* FP = R13 */
108 #define LR(reg) @(0x64,reg)
109 #define SP(reg) @(0x68,reg)
110 #define ORIG_R0(reg) @(0x6C,reg)
112 #ifdef CONFIG_PREEMPT
113 #define preempt_stop(x) CLI(x)
115 #define preempt_stop(x)
116 #define resume_kernel restore_all
126 * Return to user mode is not as complex as all this looks,
127 * but we want the default path for a system call return to
128 * go as quickly as possible which is why some of this is
129 * less clear than it otherwise should be.
132 ; userspace resumption stub bypassing syscall exit tracing
138 #ifdef CONFIG_ISA_M32R2
139 and3 r4, r4, #0x8800 ; check BSM and BPM bits
141 and3 r4, r4, #0x8000 ; check BSM bit
143 beqz r4, resume_kernel
144 ENTRY(resume_userspace)
145 CLI(r4) ; make sure we don't miss an interrupt
146 ; setting need_resched or sigpending
147 ; between sampling and the iret
149 ld r9, @(TI_FLAGS, r8)
150 and3 r4, r9, #_TIF_WORK_MASK ; is there any work to be done on
151 ; int/exception return?
152 bnez r4, work_pending
155 #ifdef CONFIG_PREEMPT
158 ld r9, @(TI_PRE_COUNT, r8) ; non-zero preempt_count ?
161 ld r9, @(TI_FLAGS, r8) ; need_resched set ?
162 and3 r4, r9, #_TIF_NEED_RESCHED
164 ld r4, PSW(sp) ; interrupts off (exception path) ?
167 LDIMM (r4, PREEMPT_ACTIVE)
168 st r4, @(TI_PRE_COUNT, r8)
172 st r4, @(TI_PRE_COUNT, r8)
177 ; system call handler stub
179 SWITCH_TO_KERNEL_STACK
181 STI(r4) ; Enable interrupt
182 st sp, PTREGS(sp) ; implicit pt_regs parameter
183 cmpui r7, #NR_syscalls
185 st r7, SYSCALL_NR(sp) ; syscall_nr
186 ; system call tracing in operation
188 ld r9, @(TI_FLAGS, r8)
189 and3 r4, r9, #_TIF_SYSCALL_TRACE
190 bnez r4, syscall_trace_entry
192 slli r7, #2 ; table jump for the system call
193 LDIMM (r4, sys_call_table)
196 jl r7 ; execute system call
197 st r0, R0(sp) ; save the return value
199 CLI(r4) ; make sure we don't miss an interrupt
200 ; setting need_resched or sigpending
201 ; between sampling and the iret
202 ld r9, @(TI_FLAGS, r8)
203 and3 r4, r9, #_TIF_ALLWORK_MASK ; current->work
204 bnez r4, syscall_exit_work
208 # perform work that needs to be done immediately before resumption
212 and3 r4, r9, #_TIF_NEED_RESCHED
213 beqz r4, work_notifysig
216 CLI(r4) ; make sure we don't miss an interrupt
217 ; setting need_resched or sigpending
218 ; between sampling and the iret
219 ld r9, @(TI_FLAGS, r8)
220 and3 r4, r9, #_TIF_WORK_MASK ; is there any work to be done other
221 ; than syscall tracing?
223 and3 r4, r4, #_TIF_NEED_RESCHED
224 bnez r4, work_resched
226 work_notifysig: ; deal with pending signals and
227 ; notify-resume requests
228 mv r0, sp ; arg1 : struct pt_regs *regs
229 ldi r1, #0 ; arg2 : sigset_t *oldset
230 mv r2, r9 ; arg3 : __u32 thread_info_flags
234 ; perform syscall exit tracing
247 ld r7, SYSCALL_NR(sp)
248 cmpui r7, #NR_syscalls
252 ; perform syscall exit tracing
255 ld r9, @(TI_FLAGS, r8)
256 and3 r4, r9, #_TIF_SYSCALL_TRACE
257 beqz r4, work_pending
258 STI(r4) ; could let do_syscall_trace() call
279 .equ ei_vec_table, eit_vector + 0x0200
285 #if defined(CONFIG_CHIP_M32700)
286 ; WORKAROUND: force to clear SM bit and use the kernel stack (SPI).
287 SWITCH_TO_KERNEL_STACK
290 mv r1, sp ; arg1(regs)
292 seth r0, #shigh(M32R_ICU_ISTS_ADDR)
293 ld r0, @(low(M32R_ICU_ISTS_ADDR),r0)
295 #if defined(CONFIG_SMP)
297 * If IRQ == 0 --> Nothing to do, Not write IMASK
298 * If IRQ == IPI --> Do IPI handler, Not write IMASK
299 * If IRQ != 0, IPI --> Do do_IRQ(), Write IMASK
302 srli r0, #24 ; r0(irq_num<<2)
304 #if defined(CONFIG_CHIP_M32700)
305 /* WORKAROUND: IMASK bug M32700-TS1, TS2 chip. */
307 ld24 r14, #0x00070000
308 seth r0, #shigh(M32R_ICU_IMASK_ADDR)
309 st r14, @(low(M32R_ICU_IMASK_ADDR),r0)
313 #endif /* CONFIG_CHIP_M32700 */
314 beqz r0, 1f ; if (!irq_num) goto exit
316 cmpi r0, #(M32R_IRQ_IPI0<<2) ; ISN < IPI0 check
318 cmpi r0, #((M32R_IRQ_IPI7+1)<<2) ; ISN > IPI7 check
320 LDIMM (r2, ei_vec_table)
323 beqz r2, 1f ; if (no IPI handler) goto exit
324 mv r0, r1 ; arg0(regs)
333 #else /* not CONFIG_SMP */
334 srli r0, #22 ; r0(irq)
335 #endif /* not CONFIG_SMP */
337 #if defined(CONFIG_PLAT_HAS_INT1ICU)
338 add3 r2, r0, #-(M32R_IRQ_INT1) ; INT1# interrupt
340 seth r0, #shigh(M32R_INT1ICU_ISTS)
341 lduh r0, @(low(M32R_INT1ICU_ISTS),r0) ; bit10-6 : ISN
344 addi r0, #(M32R_INT1ICU_IRQ_BASE)
348 #endif /* CONFIG_PLAT_HAS_INT1ICU */
349 #if defined(CONFIG_PLAT_HAS_INT0ICU)
350 add3 r2, r0, #-(M32R_IRQ_INT0) ; INT0# interrupt
352 seth r0, #shigh(M32R_INT0ICU_ISTS)
353 lduh r0, @(low(M32R_INT0ICU_ISTS),r0) ; bit10-6 : ISN
356 addi r0, #(M32R_INT0ICU_IRQ_BASE)
360 #endif /* CONFIG_PLAT_HAS_INT0ICU */
361 #if defined(CONFIG_PLAT_HAS_INT2ICU)
362 add3 r2, r0, #-(M32R_IRQ_INT2) ; INT2# interrupt
364 seth r0, #shigh(M32R_INT2ICU_ISTS)
365 lduh r0, @(low(M32R_INT2ICU_ISTS),r0) ; bit10-6 : ISN
368 addi r0, #(M32R_INT2ICU_IRQ_BASE)
372 #endif /* CONFIG_PLAT_HAS_INT2ICU */
377 seth r0, #shigh(M32R_ICU_IMASK_ADDR)
378 st r14, @(low(M32R_ICU_IMASK_ADDR),r0)
382 * Default EIT handler
386 .asciz "Unknown interrupt\n"
389 ENTRY(default_eit_handler)
396 LDIMM (r0, __KERNEL_DS)
412 * Access Exception handler
415 SWITCH_TO_KERNEL_STACK
418 seth r2, #shigh(MMU_REG_BASE) /* Check status register */
419 ld r4, @(low(MESTS_offset),r2)
420 st r4, @(low(MESTS_offset),r2)
422 #ifdef CONFIG_CHIP_M32700
423 and3 r1, r1, #0x0000ffff
424 ; WORKAROUND: ignore TME bit for the M32700(TS1).
425 #endif /* CONFIG_CHIP_M32700 */
428 ld r2, @(low(MDEVA_offset),r2) ; set address
435 mvfc r2, bpc ; set address
445 * r0 : struct pt_regs *regs
446 * r1 : unsigned long error-code
447 * r2 : unsigned long address
449 * +------+------+------+------+
450 * | bit3 | bit2 | bit1 | bit0 |
451 * +------+------+------+------+
452 * bit 3 == 0:means data, 1:means instruction
453 * bit 2 == 0:means kernel, 1:means user-mode
454 * bit 1 == 0:means read, 1:means write
455 * bit 0 == 0:means no page found 1:means protection fault
460 #endif /* CONFIG_MMU */
463 ENTRY(alignment_check)
464 /* void alignment_check(int error_code) */
465 SWITCH_TO_KERNEL_STACK
467 ldi r1, #0x30 ; error_code
469 bl do_alignment_check
471 bra ret_from_exception
474 /* void rie_handler(int error_code) */
475 SWITCH_TO_KERNEL_STACK
477 ldi r1, #0x20 ; error_code
483 /* void pie_handler(int error_code) */
484 SWITCH_TO_KERNEL_STACK
486 ldi r1, #0 ; error_code ; FIXME
492 /* void debug_trap(void) */
493 .global withdraw_debug_trap
494 SWITCH_TO_KERNEL_STACK
497 bl withdraw_debug_trap
498 ldi r1, #0 ; error_code
504 /* void ill_trap(void) */
505 SWITCH_TO_KERNEL_STACK
507 ldi r1, #0 ; error_code ; FIXME
512 ENTRY(cache_flushing_handler)
513 /* void _flush_cache_all(void); */
514 .global _flush_cache_all
515 SWITCH_TO_KERNEL_STACK
538 ENTRY(sys_call_table)
539 .long sys_restart_syscall /* 0 - old "setup()" system call*/
544 .long sys_open /* 5 */
549 .long sys_unlink /* 10 */
554 .long sys_chmod /* 15 */
555 .long sys_ni_syscall /* lchown16 syscall holder */
556 .long sys_ni_syscall /* old break syscall holder */
557 .long sys_ni_syscall /* old stat syscall holder */
559 .long sys_getpid /* 20 */
562 .long sys_ni_syscall /* setuid16 syscall holder */
563 .long sys_ni_syscall /* getuid16 syscall holder */
564 .long sys_stime /* 25 */
567 .long sys_ni_syscall /* old fstat syscall holder */
569 .long sys_utime /* 30 */
570 .long sys_ni_syscall /* old stty syscall holder */
571 .long sys_cachectl /* for M32R */ /* old gtty syscall holder */
573 .long sys_ni_syscall /* nice syscall holder */
574 .long sys_ni_syscall /* 35 - old ftime syscall holder */
579 .long sys_rmdir /* 40 */
583 .long sys_ni_syscall /* old prof syscall holder */
584 .long sys_brk /* 45 */
585 .long sys_ni_syscall /* setgid16 syscall holder */
586 .long sys_getgid /* will be unused */
587 .long sys_ni_syscall /* signal syscall holder */
588 .long sys_ni_syscall /* geteuid16 syscall holder */
589 .long sys_ni_syscall /* 50 - getegid16 syscall holder */
591 .long sys_umount /* recycled never used phys() */
592 .long sys_ni_syscall /* old lock syscall holder */
594 .long sys_fcntl /* 55 - will be unused */
595 .long sys_ni_syscall /* mpx syscall holder */
597 .long sys_ni_syscall /* old ulimit syscall holder */
598 .long sys_ni_syscall /* sys_olduname */
599 .long sys_umask /* 60 */
604 .long sys_getpgrp /* 65 */
606 .long sys_ni_syscall /* sigaction syscall holder */
607 .long sys_ni_syscall /* sgetmask syscall holder */
608 .long sys_ni_syscall /* ssetmask syscall holder */
609 .long sys_ni_syscall /* 70 - setreuid16 syscall holder */
610 .long sys_ni_syscall /* setregid16 syscall holder */
611 .long sys_ni_syscall /* sigsuspend syscall holder */
612 .long sys_ni_syscall /* sigpending syscall holder */
613 .long sys_sethostname
614 .long sys_setrlimit /* 75 */
615 .long sys_getrlimit/*will be unused*/
617 .long sys_gettimeofday
618 .long sys_settimeofday
619 .long sys_ni_syscall /* 80 - getgroups16 syscall holder */
620 .long sys_ni_syscall /* setgroups16 syscall holder */
621 .long sys_ni_syscall /* sys_oldselect */
623 .long sys_ni_syscall /* old lstat syscall holder */
624 .long sys_readlink /* 85 */
628 .long sys_ni_syscall /* readdir syscall holder */
629 .long sys_ni_syscall /* 90 - old_mmap syscall holder */
634 .long sys_ni_syscall /* 95 - fchwon16 syscall holder */
635 .long sys_getpriority
636 .long sys_setpriority
637 .long sys_ni_syscall /* old profil syscall holder */
639 .long sys_fstatfs /* 100 */
640 .long sys_ni_syscall /* ioperm syscall holder */
644 .long sys_getitimer /* 105 */
648 .long sys_ni_syscall /* old uname syscall holder */
649 .long sys_ni_syscall /* 110 - iopl syscall holder */
651 .long sys_ni_syscall /* idle syscall holder */
652 .long sys_ni_syscall /* vm86old syscall holder */
654 .long sys_swapoff /* 115 */
658 .long sys_ni_syscall /* sigreturn syscall holder */
659 .long sys_clone /* 120 */
660 .long sys_setdomainname
662 .long sys_ni_syscall /* modify_ldt syscall holder */
664 .long sys_mprotect /* 125 */
665 .long sys_ni_syscall /* sigprocmask syscall holder */
666 .long sys_ni_syscall /* create_module syscall holder */
667 .long sys_init_module
668 .long sys_delete_module
669 .long sys_ni_syscall /* 130 - get_kernel_syms */
674 .long sys_sysfs /* 135 */
675 .long sys_personality
676 .long sys_ni_syscall /* afs_syscall syscall holder */
677 .long sys_ni_syscall /* setfsuid16 syscall holder */
678 .long sys_ni_syscall /* setfsgid16 syscall holder */
679 .long sys_llseek /* 140 */
684 .long sys_readv /* 145 */
689 .long sys_mlock /* 150 */
693 .long sys_sched_setparam
694 .long sys_sched_getparam /* 155 */
695 .long sys_sched_setscheduler
696 .long sys_sched_getscheduler
697 .long sys_sched_yield
698 .long sys_sched_get_priority_max
699 .long sys_sched_get_priority_min /* 160 */
700 .long sys_sched_rr_get_interval
703 .long sys_ni_syscall /* setresuid16 syscall holder */
704 .long sys_ni_syscall /* 165 - getresuid16 syscall holder */
705 .long sys_tas /* vm86 syscall holder */
706 .long sys_ni_syscall /* query_module syscall holder */
709 .long sys_setresgid /* 170 */
712 .long sys_rt_sigreturn
713 .long sys_rt_sigaction
714 .long sys_rt_sigprocmask /* 175 */
715 .long sys_rt_sigpending
716 .long sys_rt_sigtimedwait
717 .long sys_rt_sigqueueinfo
718 .long sys_rt_sigsuspend
719 .long sys_pread64 /* 180 */
721 .long sys_ni_syscall /* chown16 syscall holder */
724 .long sys_capset /* 185 */
725 .long sys_sigaltstack
727 .long sys_ni_syscall /* streams1 */
728 .long sys_ni_syscall /* streams2 */
729 .long sys_vfork /* 190 */
733 .long sys_ftruncate64
734 .long sys_stat64 /* 195 */
739 .long sys_getgid /* 200 */
744 .long sys_getgroups /* 205 */
749 .long sys_setresgid /* 210 */
754 .long sys_setfsuid /* 215 */
759 .long sys_getdents64 /* 220 */
761 .long sys_ni_syscall /* reserved for TUX */
762 .long sys_ni_syscall /* Reserved for Security */
764 .long sys_readahead /* 225 */
769 .long sys_lgetxattr /* 230 */
774 .long sys_removexattr /* 235 */
775 .long sys_lremovexattr
776 .long sys_fremovexattr
779 .long sys_futex /* 240 */
780 .long sys_sched_setaffinity
781 .long sys_sched_getaffinity
782 .long sys_ni_syscall /* reserved for "set_thread_area" system call */
783 .long sys_ni_syscall /* reserved for "get_thread_area" system call */
784 .long sys_io_setup /* 245 */
786 .long sys_io_getevents
789 .long sys_fadvise64 /* 250 */
792 .long sys_lookup_dcookie
793 .long sys_epoll_create
794 .long sys_epoll_ctl /* 255 */
796 .long sys_remap_file_pages
797 .long sys_set_tid_address
798 .long sys_timer_create
799 .long sys_timer_settime /* 260 */
800 .long sys_timer_gettime
801 .long sys_timer_getoverrun
802 .long sys_timer_delete
803 .long sys_clock_settime
804 .long sys_clock_gettime /* 265 */
805 .long sys_clock_getres
806 .long sys_clock_nanosleep
809 .long sys_tgkill /* 270 */
811 .long sys_fadvise64_64
812 .long sys_ni_syscall /* Reserved for sys_vserver */
813 .long sys_ni_syscall /* Reserved for sys_mbind */
814 .long sys_ni_syscall /* Reserved for sys_get_mempolicy */
815 .long sys_ni_syscall /* Reserved for sys_set_mempolicy */
818 .long sys_mq_timedsend
819 .long sys_mq_timedreceive /* 280 */
821 .long sys_mq_getsetattr
822 .long sys_ni_syscall /* reserved for kexec */
825 syscall_table_size=(.-sys_call_table)