+++ /dev/null
-/*
- * arch/ppc/kernel/process.c
- *
- * Derived from "arch/i386/kernel/process.c"
- * Copyright (C) 1995 Linus Torvalds
- *
- * Updated and modified by Cort Dougan (cort@cs.nmt.edu) and
- * Paul Mackerras (paulus@cs.anu.edu.au)
- *
- * PowerPC version
- * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
- *
- * 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.
- *
- */
-
-#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/user.h>
-#include <linux/elf.h>
-#include <linux/init.h>
-#include <linux/prctl.h>
-#include <linux/init_task.h>
-#include <linux/module.h>
-#include <linux/kallsyms.h>
-#include <linux/mqueue.h>
-#include <linux/hardirq.h>
-
-#include <asm/pgtable.h>
-#include <asm/uaccess.h>
-#include <asm/system.h>
-#include <asm/io.h>
-#include <asm/processor.h>
-#include <asm/mmu.h>
-#include <asm/prom.h>
-
-extern unsigned long _get_SP(void);
-
-struct task_struct *last_task_used_math = NULL;
-struct task_struct *last_task_used_altivec = NULL;
-struct task_struct *last_task_used_spe = NULL;
-
-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);
-
-/* this is 8kB-aligned so we can get to the thread_info struct
- at the base of it from the stack pointer with 1 integer instruction. */
-union thread_union init_thread_union
- __attribute__((__section__(".data.init_task"))) =
-{ INIT_THREAD_INFO(init_task) };
-
-/* initial task structure */
-struct task_struct init_task = INIT_TASK(init_task);
-EXPORT_SYMBOL(init_task);
-
-/* only used to get secondary processor up */
-struct task_struct *current_set[NR_CPUS] = {&init_task, };
-
-#undef SHOW_TASK_SWITCHES
-#undef CHECK_STACK
-
-#if defined(CHECK_STACK)
-unsigned long
-kernel_stack_top(struct task_struct *tsk)
-{
- return ((unsigned long)tsk) + sizeof(union task_union);
-}
-
-unsigned long
-task_top(struct task_struct *tsk)
-{
- return ((unsigned long)tsk) + sizeof(struct thread_info);
-}
-
-/* check to make sure the kernel stack is healthy */
-int check_stack(struct task_struct *tsk)
-{
- unsigned long stack_top = kernel_stack_top(tsk);
- unsigned long tsk_top = task_top(tsk);
- int ret = 0;
-
-#if 0
- /* check thread magic */
- if ( tsk->thread.magic != THREAD_MAGIC )
- {
- ret |= 1;
- printk("thread.magic bad: %08x\n", tsk->thread.magic);
- }
-#endif
-
- if ( !tsk )
- printk("check_stack(): tsk bad tsk %p\n",tsk);
-
- /* check if stored ksp is bad */
- if ( (tsk->thread.ksp > stack_top) || (tsk->thread.ksp < tsk_top) )
- {
- printk("stack out of bounds: %s/%d\n"
- " tsk_top %08lx ksp %08lx stack_top %08lx\n",
- tsk->comm,tsk->pid,
- tsk_top, tsk->thread.ksp, stack_top);
- ret |= 2;
- }
-
- /* check if stack ptr RIGHT NOW is bad */
- if ( (tsk == current) && ((_get_SP() > stack_top ) || (_get_SP() < tsk_top)) )
- {
- printk("current stack ptr out of bounds: %s/%d\n"
- " tsk_top %08lx sp %08lx stack_top %08lx\n",
- current->comm,current->pid,
- tsk_top, _get_SP(), stack_top);
- ret |= 4;
- }
-
-#if 0
- /* check amount of free stack */
- for ( i = (unsigned long *)task_top(tsk) ; i < kernel_stack_top(tsk) ; i++ )
- {
- if ( !i )
- printk("check_stack(): i = %p\n", i);
- if ( *i != 0 )
- {
- /* only notify if it's less than 900 bytes */
- if ( (i - (unsigned long *)task_top(tsk)) < 900 )
- printk("%d bytes free on stack\n",
- i - task_top(tsk));
- break;
- }
- }
-#endif
-
- if (ret)
- {
- panic("bad kernel stack");
- }
- return(ret);
-}
-#endif /* defined(CHECK_STACK) */
-
-/*
- * Make sure the floating-point register state in the
- * the thread_struct is up to date for task tsk.
- */
-void flush_fp_to_thread(struct task_struct *tsk)
-{
- if (tsk->thread.regs) {
- /*
- * We need to disable preemption here because if we didn't,
- * another process could get scheduled after the regs->msr
- * test but before we have finished saving the FP registers
- * to the thread_struct. That process could take over the
- * FPU, and then when we get scheduled again we would store
- * bogus values for the remaining FP registers.
- */
- preempt_disable();
- if (tsk->thread.regs->msr & MSR_FP) {
-#ifdef CONFIG_SMP
- /*
- * This should only ever be called for current or
- * for a stopped child process. Since we save away
- * the FP register state on context switch on SMP,
- * there is something wrong if a stopped child appears
- * to still have its FP state in the CPU registers.
- */
- BUG_ON(tsk != current);
-#endif
- giveup_fpu(current);
- }
- preempt_enable();
- }
-}
-
-void enable_kernel_fp(void)
-{
- WARN_ON(preemptible());
-
-#ifdef CONFIG_SMP
- if (current->thread.regs && (current->thread.regs->msr & MSR_FP))
- giveup_fpu(current);
- else
- giveup_fpu(NULL); /* just enables FP for kernel */
-#else
- giveup_fpu(last_task_used_math);
-#endif /* CONFIG_SMP */
-}
-EXPORT_SYMBOL(enable_kernel_fp);
-
-int dump_task_fpu(struct task_struct *tsk, elf_fpregset_t *fpregs)
-{
- preempt_disable();
- if (tsk->thread.regs && (tsk->thread.regs->msr & MSR_FP))
- giveup_fpu(tsk);
- preempt_enable();
- memcpy(fpregs, &tsk->thread.fpr[0], sizeof(*fpregs));
- return 1;
-}
-
-#ifdef CONFIG_ALTIVEC
-void enable_kernel_altivec(void)
-{
- WARN_ON(preemptible());
-
-#ifdef CONFIG_SMP
- if (current->thread.regs && (current->thread.regs->msr & MSR_VEC))
- giveup_altivec(current);
- else
- giveup_altivec(NULL); /* just enable AltiVec for kernel - force */
-#else
- giveup_altivec(last_task_used_altivec);
-#endif /* __SMP __ */
-}
-EXPORT_SYMBOL(enable_kernel_altivec);
-
-/*
- * Make sure the VMX/Altivec register state in the
- * the thread_struct is up to date for task tsk.
- */
-void flush_altivec_to_thread(struct task_struct *tsk)
-{
- if (tsk->thread.regs) {
- preempt_disable();
- if (tsk->thread.regs->msr & MSR_VEC) {
-#ifdef CONFIG_SMP
- BUG_ON(tsk != current);
-#endif
- giveup_altivec(current);
- }
- preempt_enable();
- }
-}
-
-int dump_altivec(struct pt_regs *regs, elf_vrregset_t *vrregs)
-{
- if (regs->msr & MSR_VEC)
- giveup_altivec(current);
- memcpy(vrregs, ¤t->thread.vr[0], sizeof(*vrregs));
- return 1;
-}
-#endif /* CONFIG_ALTIVEC */
-
-#ifdef CONFIG_SPE
-void
-enable_kernel_spe(void)
-{
- WARN_ON(preemptible());
-
-#ifdef CONFIG_SMP
- if (current->thread.regs && (current->thread.regs->msr & MSR_SPE))
- giveup_spe(current);
- else
- giveup_spe(NULL); /* just enable SPE for kernel - force */
-#else
- giveup_spe(last_task_used_spe);
-#endif /* __SMP __ */
-}
-EXPORT_SYMBOL(enable_kernel_spe);
-
-void flush_spe_to_thread(struct task_struct *tsk)
-{
- if (tsk->thread.regs) {
- preempt_disable();
- if (tsk->thread.regs->msr & MSR_SPE) {
-#ifdef CONFIG_SMP
- BUG_ON(tsk != current);
-#endif
- giveup_spe(current);
- }
- preempt_enable();
- }
-}
-
-int dump_spe(struct pt_regs *regs, elf_vrregset_t *evrregs)
-{
- if (regs->msr & MSR_SPE)
- giveup_spe(current);
- /* We copy u32 evr[32] + u64 acc + u32 spefscr -> 35 */
- memcpy(evrregs, ¤t->thread.evr[0], sizeof(u32) * 35);
- return 1;
-}
-#endif /* CONFIG_SPE */
-
-struct task_struct *__switch_to(struct task_struct *prev,
- struct task_struct *new)
-{
- struct thread_struct *new_thread, *old_thread;
- unsigned long s;
- struct task_struct *last;
-
- local_irq_save(s);
-#ifdef CHECK_STACK
- check_stack(prev);
- check_stack(new);
-#endif
-
-#ifdef CONFIG_SMP
- /* avoid complexity of lazy save/restore of fpu
- * by just saving it every time we switch out if
- * this task used the fpu during the last quantum.
- *
- * If it tries to use the fpu again, it'll trap and
- * reload its fp regs. So we don't have to do a restore
- * every switch, just a save.
- * -- Cort
- */
- if (prev->thread.regs && (prev->thread.regs->msr & MSR_FP))
- giveup_fpu(prev);
-#ifdef CONFIG_ALTIVEC
- /*
- * If the previous thread used altivec in the last quantum
- * (thus changing altivec regs) then save them.
- * We used to check the VRSAVE register but not all apps
- * set it, so we don't rely on it now (and in fact we need
- * to save & restore VSCR even if VRSAVE == 0). -- paulus
- *
- * On SMP we always save/restore altivec regs just to avoid the
- * complexity of changing processors.
- * -- Cort
- */
- if ((prev->thread.regs && (prev->thread.regs->msr & MSR_VEC)))
- giveup_altivec(prev);
-#endif /* CONFIG_ALTIVEC */
-#ifdef CONFIG_SPE
- /*
- * If the previous thread used spe in the last quantum
- * (thus changing spe regs) then save them.
- *
- * On SMP we always save/restore spe regs just to avoid the
- * complexity of changing processors.
- */
- if ((prev->thread.regs && (prev->thread.regs->msr & MSR_SPE)))
- giveup_spe(prev);
-#endif /* CONFIG_SPE */
-#endif /* CONFIG_SMP */
-
-#ifdef CONFIG_ALTIVEC
- /* Avoid the trap. On smp this this never happens since
- * we don't set last_task_used_altivec -- Cort
- */
- if (new->thread.regs && last_task_used_altivec == new)
- new->thread.regs->msr |= MSR_VEC;
-#endif
-#ifdef CONFIG_SPE
- /* Avoid the trap. On smp this this never happens since
- * we don't set last_task_used_spe
- */
- if (new->thread.regs && last_task_used_spe == new)
- new->thread.regs->msr |= MSR_SPE;
-#endif /* CONFIG_SPE */
- new_thread = &new->thread;
- old_thread = ¤t->thread;
- last = _switch(old_thread, new_thread);
- local_irq_restore(s);
- return last;
-}
-
-void show_regs(struct pt_regs * regs)
-{
- int i, trap;
-
- printk("NIP: %08lX LR: %08lX SP: %08lX REGS: %p TRAP: %04lx %s\n",
- regs->nip, regs->link, regs->gpr[1], regs, regs->trap,
- print_tainted());
- printk("MSR: %08lx EE: %01x PR: %01x FP: %01x ME: %01x IR/DR: %01x%01x\n",
- regs->msr, regs->msr&MSR_EE ? 1 : 0, regs->msr&MSR_PR ? 1 : 0,
- regs->msr & MSR_FP ? 1 : 0,regs->msr&MSR_ME ? 1 : 0,
- regs->msr&MSR_IR ? 1 : 0,
- regs->msr&MSR_DR ? 1 : 0);
- trap = TRAP(regs);
- if (trap == 0x300 || trap == 0x600)
- printk("DAR: %08lX, DSISR: %08lX\n", regs->dar, regs->dsisr);
- printk("TASK = %p[%d] '%s' THREAD: %p\n",
- current, current->pid, current->comm, current->thread_info);
- printk("Last syscall: %ld ", current->thread.last_syscall);
-
-#ifdef CONFIG_SMP
- printk(" CPU: %d", smp_processor_id());
-#endif /* CONFIG_SMP */
-
- for (i = 0; i < 32; i++) {
- long r;
- if ((i % 8) == 0)
- printk("\n" KERN_INFO "GPR%02d: ", i);
- if (__get_user(r, ®s->gpr[i]))
- break;
- printk("%08lX ", r);
- if (i == 12 && !FULL_REGS(regs))
- break;
- }
- printk("\n");
-#ifdef CONFIG_KALLSYMS
- /*
- * Lookup NIP late so we have the best change of getting the
- * above info out without failing
- */
- printk("NIP [%08lx] ", regs->nip);
- print_symbol("%s\n", regs->nip);
- printk("LR [%08lx] ", regs->link);
- print_symbol("%s\n", regs->link);
-#endif
- show_stack(current, (unsigned long *) regs->gpr[1]);
-}
-
-void exit_thread(void)
-{
- preempt_disable();
- if (last_task_used_math == current)
- last_task_used_math = NULL;
- if (last_task_used_altivec == current)
- last_task_used_altivec = NULL;
-#ifdef CONFIG_SPE
- if (last_task_used_spe == current)
- last_task_used_spe = NULL;
-#endif
- preempt_enable();
-}
-
-void flush_thread(void)
-{
- preempt_disable();
- if (last_task_used_math == current)
- last_task_used_math = NULL;
- if (last_task_used_altivec == current)
- last_task_used_altivec = NULL;
-#ifdef CONFIG_SPE
- if (last_task_used_spe == current)
- last_task_used_spe = NULL;
-#endif
- preempt_enable();
-}
-
-void
-release_thread(struct task_struct *t)
-{
-}
-
-/*
- * This gets called before we allocate a new thread and copy
- * the current task into it.
- */
-void prepare_to_copy(struct task_struct *tsk)
-{
- struct pt_regs *regs = tsk->thread.regs;
-
- if (regs == NULL)
- return;
- preempt_disable();
- if (regs->msr & MSR_FP)
- giveup_fpu(current);
-#ifdef CONFIG_ALTIVEC
- if (regs->msr & MSR_VEC)
- giveup_altivec(current);
-#endif /* CONFIG_ALTIVEC */
-#ifdef CONFIG_SPE
- if (regs->msr & MSR_SPE)
- giveup_spe(current);
-#endif /* CONFIG_SPE */
- preempt_enable();
-}
-
-/*
- * Copy a thread..
- */
-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, *kregs;
- extern void ret_from_fork(void);
- unsigned long sp = (unsigned long)p->thread_info + THREAD_SIZE;
- unsigned long childframe;
-
- CHECK_FULL_REGS(regs);
- /* Copy registers */
- sp -= sizeof(struct pt_regs);
- childregs = (struct pt_regs *) sp;
- *childregs = *regs;
- if ((childregs->msr & MSR_PR) == 0) {
- /* for kernel thread, set `current' and stackptr in new task */
- childregs->gpr[1] = sp + sizeof(struct pt_regs);
- childregs->gpr[2] = (unsigned long) p;
- p->thread.regs = NULL; /* no user register state */
- } else {
- childregs->gpr[1] = usp;
- p->thread.regs = childregs;
- if (clone_flags & CLONE_SETTLS)
- childregs->gpr[2] = childregs->gpr[6];
- }
- childregs->gpr[3] = 0; /* Result from fork() */
- sp -= STACK_FRAME_OVERHEAD;
- childframe = sp;
-
- /*
- * The way this works is that at some point in the future
- * some task will call _switch to switch to the new task.
- * That will pop off the stack frame created below and start
- * the new task running at ret_from_fork. The new task will
- * do some house keeping and then return from the fork or clone
- * system call, using the stack frame created above.
- */
- sp -= sizeof(struct pt_regs);
- kregs = (struct pt_regs *) sp;
- sp -= STACK_FRAME_OVERHEAD;
- p->thread.ksp = sp;
- kregs->nip = (unsigned long)ret_from_fork;
-
- p->thread.last_syscall = -1;
-
- return 0;
-}
-
-/*
- * Set up a thread for executing a new program
- */
-void start_thread(struct pt_regs *regs, unsigned long nip, unsigned long sp)
-{
- set_fs(USER_DS);
- memset(regs->gpr, 0, sizeof(regs->gpr));
- regs->ctr = 0;
- regs->link = 0;
- regs->xer = 0;
- regs->ccr = 0;
- regs->mq = 0;
- regs->nip = nip;
- regs->gpr[1] = sp;
- regs->msr = MSR_USER;
- preempt_disable();
- if (last_task_used_math == current)
- last_task_used_math = NULL;
- if (last_task_used_altivec == current)
- last_task_used_altivec = NULL;
-#ifdef CONFIG_SPE
- if (last_task_used_spe == current)
- last_task_used_spe = NULL;
-#endif
- preempt_enable();
- memset(current->thread.fpr, 0, sizeof(current->thread.fpr));
- current->thread.fpscr.val = 0;
-#ifdef CONFIG_ALTIVEC
- memset(current->thread.vr, 0, sizeof(current->thread.vr));
- memset(¤t->thread.vscr, 0, sizeof(current->thread.vscr));
- current->thread.vrsave = 0;
- current->thread.used_vr = 0;
-#endif /* CONFIG_ALTIVEC */
-#ifdef CONFIG_SPE
- memset(current->thread.evr, 0, sizeof(current->thread.evr));
- current->thread.acc = 0;
- current->thread.spefscr = 0;
- current->thread.used_spe = 0;
-#endif /* CONFIG_SPE */
-}
-
-#define PR_FP_ALL_EXCEPT (PR_FP_EXC_DIV | PR_FP_EXC_OVF | PR_FP_EXC_UND \
- | PR_FP_EXC_RES | PR_FP_EXC_INV)
-
-int set_fpexc_mode(struct task_struct *tsk, unsigned int val)
-{
- struct pt_regs *regs = tsk->thread.regs;
-
- /* This is a bit hairy. If we are an SPE enabled processor
- * (have embedded fp) we store the IEEE exception enable flags in
- * fpexc_mode. fpexc_mode is also used for setting FP exception
- * mode (asyn, precise, disabled) for 'Classic' FP. */
- if (val & PR_FP_EXC_SW_ENABLE) {
-#ifdef CONFIG_SPE
- tsk->thread.fpexc_mode = val &
- (PR_FP_EXC_SW_ENABLE | PR_FP_ALL_EXCEPT);
-#else
- return -EINVAL;
-#endif
- } else {
- /* on a CONFIG_SPE this does not hurt us. The bits that
- * __pack_fe01 use do not overlap with bits used for
- * PR_FP_EXC_SW_ENABLE. Additionally, the MSR[FE0,FE1] bits
- * on CONFIG_SPE implementations are reserved so writing to
- * them does not change anything */
- if (val > PR_FP_EXC_PRECISE)
- return -EINVAL;
- tsk->thread.fpexc_mode = __pack_fe01(val);
- if (regs != NULL && (regs->msr & MSR_FP) != 0)
- regs->msr = (regs->msr & ~(MSR_FE0|MSR_FE1))
- | tsk->thread.fpexc_mode;
- }
- return 0;
-}
-
-int get_fpexc_mode(struct task_struct *tsk, unsigned long adr)
-{
- unsigned int val;
-
- if (tsk->thread.fpexc_mode & PR_FP_EXC_SW_ENABLE)
-#ifdef CONFIG_SPE
- val = tsk->thread.fpexc_mode;
-#else
- return -EINVAL;
-#endif
- else
- val = __unpack_fe01(tsk->thread.fpexc_mode);
- return put_user(val, (unsigned int __user *) adr);
-}
-
-int sys_clone(unsigned long clone_flags, unsigned long usp,
- int __user *parent_tidp, void __user *child_threadptr,
- int __user *child_tidp, int p6,
- struct pt_regs *regs)
-{
- CHECK_FULL_REGS(regs);
- if (usp == 0)
- usp = regs->gpr[1]; /* stack pointer for child */
- return do_fork(clone_flags, usp, regs, 0, parent_tidp, child_tidp);
-}
-
-int sys_fork(unsigned long p1, unsigned long p2, unsigned long p3,
- unsigned long p4, unsigned long p5, unsigned long p6,
- struct pt_regs *regs)
-{
- CHECK_FULL_REGS(regs);
- return do_fork(SIGCHLD, regs->gpr[1], regs, 0, NULL, NULL);
-}
-
-int sys_vfork(unsigned long p1, unsigned long p2, unsigned long p3,
- unsigned long p4, unsigned long p5, unsigned long p6,
- struct pt_regs *regs)
-{
- CHECK_FULL_REGS(regs);
- return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs->gpr[1],
- regs, 0, NULL, NULL);
-}
-
-int sys_execve(unsigned long a0, unsigned long a1, unsigned long a2,
- unsigned long a3, unsigned long a4, unsigned long a5,
- struct pt_regs *regs)
-{
- int error;
- char * filename;
-
- filename = getname((char __user *) a0);
- error = PTR_ERR(filename);
- if (IS_ERR(filename))
- goto out;
- preempt_disable();
- if (regs->msr & MSR_FP)
- giveup_fpu(current);
-#ifdef CONFIG_ALTIVEC
- if (regs->msr & MSR_VEC)
- giveup_altivec(current);
-#endif /* CONFIG_ALTIVEC */
-#ifdef CONFIG_SPE
- if (regs->msr & MSR_SPE)
- giveup_spe(current);
-#endif /* CONFIG_SPE */
- preempt_enable();
- error = do_execve(filename, (char __user *__user *) a1,
- (char __user *__user *) a2, regs);
- if (error == 0) {
- task_lock(current);
- current->ptrace &= ~PT_DTRACE;
- task_unlock(current);
- }
- putname(filename);
-out:
- return error;
-}
-
-void dump_stack(void)
-{
- show_stack(current, NULL);
-}
-
-EXPORT_SYMBOL(dump_stack);
-
-void show_stack(struct task_struct *tsk, unsigned long *stack)
-{
- unsigned long sp, stack_top, prev_sp, ret;
- int count = 0;
- unsigned long next_exc = 0;
- struct pt_regs *regs;
- extern char ret_from_except, ret_from_except_full, ret_from_syscall;
-
- sp = (unsigned long) stack;
- if (tsk == NULL)
- tsk = current;
- if (sp == 0) {
- if (tsk == current)
- asm("mr %0,1" : "=r" (sp));
- else
- sp = tsk->thread.ksp;
- }
-
- prev_sp = (unsigned long) (tsk->thread_info + 1);
- stack_top = (unsigned long) tsk->thread_info + THREAD_SIZE;
- while (count < 16 && sp > prev_sp && sp < stack_top && (sp & 3) == 0) {
- if (count == 0) {
- printk("Call trace:");
-#ifdef CONFIG_KALLSYMS
- printk("\n");
-#endif
- } else {
- if (next_exc) {
- ret = next_exc;
- next_exc = 0;
- } else
- ret = *(unsigned long *)(sp + 4);
- printk(" [%08lx] ", ret);
-#ifdef CONFIG_KALLSYMS
- print_symbol("%s", ret);
- printk("\n");
-#endif
- if (ret == (unsigned long) &ret_from_except
- || ret == (unsigned long) &ret_from_except_full
- || ret == (unsigned long) &ret_from_syscall) {
- /* sp + 16 points to an exception frame */
- regs = (struct pt_regs *) (sp + 16);
- if (sp + 16 + sizeof(*regs) <= stack_top)
- next_exc = regs->nip;
- }
- }
- ++count;
- sp = *(unsigned long *)sp;
- }
-#ifndef CONFIG_KALLSYMS
- if (count > 0)
- printk("\n");
-#endif
-}
-
-#if 0
-/*
- * Low level print for debugging - Cort
- */
-int __init ll_printk(const char *fmt, ...)
-{
- va_list args;
- char buf[256];
- int i;
-
- va_start(args, fmt);
- i=vsprintf(buf,fmt,args);
- ll_puts(buf);
- va_end(args);
- return i;
-}
-
-int lines = 24, cols = 80;
-int orig_x = 0, orig_y = 0;
-
-void puthex(unsigned long val)
-{
- unsigned char buf[10];
- int i;
- for (i = 7; i >= 0; i--)
- {
- buf[i] = "0123456789ABCDEF"[val & 0x0F];
- val >>= 4;
- }
- buf[8] = '\0';
- prom_print(buf);
-}
-
-void __init ll_puts(const char *s)
-{
- int x,y;
- char *vidmem = (char *)/*(_ISA_MEM_BASE + 0xB8000) */0xD00B8000;
- char c;
- extern int mem_init_done;
-
- if ( mem_init_done ) /* assume this means we can printk */
- {
- printk(s);
- return;
- }
-
-#if 0
- if ( have_of )
- {
- prom_print(s);
- return;
- }
-#endif
-
- /*
- * can't ll_puts on chrp without openfirmware yet.
- * vidmem just needs to be setup for it.
- * -- Cort
- */
- if ( _machine != _MACH_prep )
- return;
- x = orig_x;
- y = orig_y;
-
- while ( ( c = *s++ ) != '\0' ) {
- if ( c == '\n' ) {
- x = 0;
- if ( ++y >= lines ) {
- /*scroll();*/
- /*y--;*/
- y = 0;
- }
- } else {
- vidmem [ ( x + cols * y ) * 2 ] = c;
- if ( ++x >= cols ) {
- x = 0;
- if ( ++y >= lines ) {
- /*scroll();*/
- /*y--;*/
- y = 0;
- }
- }
- }
- }
-
- orig_x = x;
- orig_y = y;
-}
-#endif
-
-unsigned long get_wchan(struct task_struct *p)
-{
- unsigned long ip, sp;
- 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.ksp;
- do {
- sp = *(unsigned long *)sp;
- if (sp < stack_page || sp >= stack_page + 8188)
- return 0;
- if (count > 0) {
- ip = *(unsigned long *)(sp + 4);
- if (!in_sched_functions(ip))
- return ip;
- }
- } while (count++ < 16);
- return 0;
-}
projects / linux-2.6 / commitdiff