aboutsummaryrefslogtreecommitdiff
path: root/arch/arm26/kernel/traps.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/arm26/kernel/traps.c')
-rw-r--r--arch/arm26/kernel/traps.c548
1 files changed, 0 insertions, 548 deletions
diff --git a/arch/arm26/kernel/traps.c b/arch/arm26/kernel/traps.c
deleted file mode 100644
index 2911e2eae80..00000000000
--- a/arch/arm26/kernel/traps.c
+++ /dev/null
@@ -1,548 +0,0 @@
-/*
- * linux/arch/arm26/kernel/traps.c
- *
- * Copyright (C) 1995-2002 Russell King
- * Fragments that appear the same as linux/arch/i386/kernel/traps.c (C) Linus Torvalds
- * Copyright (C) 2003 Ian Molton (ARM26)
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- * 'traps.c' handles hardware exceptions after we have saved some state in
- * 'linux/arch/arm26/lib/traps.S'. Mostly a debugging aid, but will probably
- * kill the offending process.
- */
-
-#include <linux/module.h>
-#include <linux/types.h>
-#include <linux/kernel.h>
-#include <linux/signal.h>
-#include <linux/sched.h>
-#include <linux/mm.h>
-#include <linux/spinlock.h>
-#include <linux/personality.h>
-#include <linux/ptrace.h>
-#include <linux/elf.h>
-#include <linux/interrupt.h>
-#include <linux/init.h>
-
-#include <asm/atomic.h>
-#include <asm/io.h>
-#include <asm/pgtable.h>
-#include <asm/system.h>
-#include <asm/uaccess.h>
-#include <asm/unistd.h>
-#include <linux/mutex.h>
-
-#include "ptrace.h"
-
-extern void c_backtrace (unsigned long fp, int pmode);
-extern void show_pte(struct mm_struct *mm, unsigned long addr);
-
-const char *processor_modes[] = { "USER_26", "FIQ_26" , "IRQ_26" , "SVC_26" };
-
-static const char *handler[]= { "prefetch abort", "data abort", "address exception", "interrupt" "*bad reason*"};
-
-/*
- * Stack pointers should always be within the kernels view of
- * physical memory. If it is not there, then we can't dump
- * out any information relating to the stack.
- */
-static int verify_stack(unsigned long sp)
-{
- if (sp < PAGE_OFFSET || (sp > (unsigned long)high_memory && high_memory != 0))
- return -EFAULT;
-
- return 0;
-}
-
-/*
- * Dump out the contents of some memory nicely...
- */
-static void dump_mem(const char *str, unsigned long bottom, unsigned long top)
-{
- unsigned long p = bottom & ~31;
- mm_segment_t fs;
- int i;
-
- /*
- * We need to switch to kernel mode so that we can use __get_user
- * to safely read from kernel space. Note that we now dump the
- * code first, just in case the backtrace kills us.
- */
- fs = get_fs();
- set_fs(KERNEL_DS);
-
- printk("%s", str);
- printk("(0x%08lx to 0x%08lx)\n", bottom, top);
-
- for (p = bottom & ~31; p < top;) {
- printk("%04lx: ", p & 0xffff);
-
- for (i = 0; i < 8; i++, p += 4) {
- unsigned int val;
-
- if (p < bottom || p >= top)
- printk(" ");
- else {
- __get_user(val, (unsigned long *)p);
- printk("%08x ", val);
- }
- }
- printk ("\n");
- }
-
- set_fs(fs);
-}
-
-static void dump_instr(struct pt_regs *regs)
-{
- unsigned long addr = instruction_pointer(regs);
- const int width = 8;
- mm_segment_t fs;
- int i;
-
- /*
- * We need to switch to kernel mode so that we can use __get_user
- * to safely read from kernel space. Note that we now dump the
- * code first, just in case the backtrace kills us.
- */
- fs = get_fs();
- set_fs(KERNEL_DS);
-
- printk("Code: ");
- for (i = -4; i < 1; i++) {
- unsigned int val, bad;
-
- bad = __get_user(val, &((u32 *)addr)[i]);
-
- if (!bad)
- printk(i == 0 ? "(%0*x) " : "%0*x ", width, val);
- else {
- printk("bad PC value.");
- break;
- }
- }
- printk("\n");
-
- set_fs(fs);
-}
-
-/*static*/ void __dump_stack(struct task_struct *tsk, unsigned long sp)
-{
- dump_mem("Stack: ", sp, 8192+(unsigned long)task_stack_page(tsk));
-}
-
-void dump_stack(void)
-{
-#ifdef CONFIG_DEBUG_ERRORS
- __backtrace();
-#endif
-}
-
-EXPORT_SYMBOL(dump_stack);
-
-//FIXME - was a static fn
-void dump_backtrace(struct pt_regs *regs, struct task_struct *tsk)
-{
- unsigned int fp;
- int ok = 1;
-
- printk("Backtrace: ");
- fp = regs->ARM_fp;
- if (!fp) {
- printk("no frame pointer");
- ok = 0;
- } else if (verify_stack(fp)) {
- printk("invalid frame pointer 0x%08x", fp);
- ok = 0;
- } else if (fp < (unsigned long)end_of_stack(tsk))
- printk("frame pointer underflow");
- printk("\n");
-
- if (ok)
- c_backtrace(fp, processor_mode(regs));
-}
-
-/* FIXME - this is probably wrong.. */
-void show_stack(struct task_struct *task, unsigned long *sp) {
- dump_mem("Stack: ", (unsigned long)sp, 8192+(unsigned long)task_stack_page(task));
-}
-
-DEFINE_SPINLOCK(die_lock);
-
-/*
- * This function is protected against re-entrancy.
- */
-NORET_TYPE void die(const char *str, struct pt_regs *regs, int err)
-{
- struct task_struct *tsk = current;
-
- console_verbose();
- spin_lock_irq(&die_lock);
-
- printk("Internal error: %s: %x\n", str, err);
- printk("CPU: %d\n", smp_processor_id());
- show_regs(regs);
- add_taint(TAINT_DIE);
- printk("Process %s (pid: %d, stack limit = 0x%p)\n",
- current->comm, current->pid, end_of_stack(tsk));
-
- if (!user_mode(regs) || in_interrupt()) {
- __dump_stack(tsk, (unsigned long)(regs + 1));
- dump_backtrace(regs, tsk);
- dump_instr(regs);
- }
-while(1);
- spin_unlock_irq(&die_lock);
- do_exit(SIGSEGV);
-}
-
-void die_if_kernel(const char *str, struct pt_regs *regs, int err)
-{
- if (user_mode(regs))
- return;
-
- die(str, regs, err);
-}
-
-static DEFINE_MUTEX(undef_mutex);
-static int (*undef_hook)(struct pt_regs *);
-
-int request_undef_hook(int (*fn)(struct pt_regs *))
-{
- int ret = -EBUSY;
-
- mutex_lock(&undef_mutex);
- if (undef_hook == NULL) {
- undef_hook = fn;
- ret = 0;
- }
- mutex_unlock(&undef_mutex);
-
- return ret;
-}
-
-int release_undef_hook(int (*fn)(struct pt_regs *))
-{
- int ret = -EINVAL;
-
- mutex_lock(&undef_mutex);
- if (undef_hook == fn) {
- undef_hook = NULL;
- ret = 0;
- }
- mutex_unlock(&undef_mutex);
-
- return ret;
-}
-
-static int undefined_extension(struct pt_regs *regs, unsigned int op)
-{
- switch (op) {
- case 1: /* 0xde01 / 0x?7f001f0 */
- ptrace_break(current, regs);
- return 0;
- }
- return 1;
-}
-
-asmlinkage void do_undefinstr(struct pt_regs *regs)
-{
- siginfo_t info;
- void *pc;
-
- regs->ARM_pc -= 4;
-
- pc = (unsigned long *)instruction_pointer(regs); /* strip PSR */
-
- if (user_mode(regs)) {
- u32 instr;
-
- get_user(instr, (u32 *)pc);
-
- if ((instr & 0x0fff00ff) == 0x07f000f0 &&
- undefined_extension(regs, (instr >> 8) & 255) == 0) {
- regs->ARM_pc += 4;
- return;
- }
- } else {
- if (undef_hook && undef_hook(regs) == 0) {
- regs->ARM_pc += 4;
- return;
- }
- }
-
-#ifdef CONFIG_DEBUG_USER
- printk(KERN_INFO "%s (%d): undefined instruction: pc=%p\n",
- current->comm, current->pid, pc);
- dump_instr(regs);
-#endif
-
- current->thread.error_code = 0;
- current->thread.trap_no = 6;
-
- info.si_signo = SIGILL;
- info.si_errno = 0;
- info.si_code = ILL_ILLOPC;
- info.si_addr = pc;
-
- force_sig_info(SIGILL, &info, current);
-
- die_if_kernel("Oops - undefined instruction", regs, 0);
-}
-
-asmlinkage void do_excpt(unsigned long address, struct pt_regs *regs, int mode)
-{
- siginfo_t info;
-
-#ifdef CONFIG_DEBUG_USER
- printk(KERN_INFO "%s (%d): address exception: pc=%08lx\n",
- current->comm, current->pid, instruction_pointer(regs));
- dump_instr(regs);
-#endif
-
- current->thread.error_code = 0;
- current->thread.trap_no = 11;
-
- info.si_signo = SIGBUS;
- info.si_errno = 0;
- info.si_code = BUS_ADRERR;
- info.si_addr = (void *)address;
-
- force_sig_info(SIGBUS, &info, current);
-
- die_if_kernel("Oops - address exception", regs, mode);
-}
-
-asmlinkage void do_unexp_fiq (struct pt_regs *regs)
-{
-#ifndef CONFIG_IGNORE_FIQ
- printk("Hmm. Unexpected FIQ received, but trying to continue\n");
- printk("You may have a hardware problem...\n");
-#endif
-}
-
-/*
- * bad_mode handles the impossible case in the vectors. If you see one of
- * these, then it's extremely serious, and could mean you have buggy hardware.
- * It never returns, and never tries to sync. We hope that we can at least
- * dump out some state information...
- */
-asmlinkage void bad_mode(struct pt_regs *regs, int reason, int proc_mode)
-{
- unsigned int vectors = vectors_base();
-
- console_verbose();
-
- printk(KERN_CRIT "Bad mode in %s handler detected: mode %s\n",
- handler[reason<5?reason:4], processor_modes[proc_mode]);
-
- /*
- * Dump out the vectors and stub routines. Maybe a better solution
- * would be to dump them out only if we detect that they are corrupted.
- */
- dump_mem(KERN_CRIT "Vectors: ", vectors, vectors + 0x40);
- dump_mem(KERN_CRIT "Stubs: ", vectors + 0x200, vectors + 0x4b8);
-
- die("Oops", regs, 0);
- local_irq_disable();
- panic("bad mode");
-}
-
-static int bad_syscall(int n, struct pt_regs *regs)
-{
- struct thread_info *thread = current_thread_info();
- siginfo_t info;
-
- if (current->personality != PER_LINUX && thread->exec_domain->handler) {
- thread->exec_domain->handler(n, regs);
- return regs->ARM_r0;
- }
-
-#ifdef CONFIG_DEBUG_USER
- printk(KERN_ERR "[%d] %s: obsolete system call %08x.\n",
- current->pid, current->comm, n);
- dump_instr(regs);
-#endif
-
- info.si_signo = SIGILL;
- info.si_errno = 0;
- info.si_code = ILL_ILLTRP;
- info.si_addr = (void *)instruction_pointer(regs) - 4;
-
- force_sig_info(SIGILL, &info, current);
- die_if_kernel("Oops", regs, n);
- return regs->ARM_r0;
-}
-
-static inline void
-do_cache_op(unsigned long start, unsigned long end, int flags)
-{
- struct vm_area_struct *vma;
-
- if (end < start)
- return;
-
- vma = find_vma(current->active_mm, start);
- if (vma && vma->vm_start < end) {
- if (start < vma->vm_start)
- start = vma->vm_start;
- if (end > vma->vm_end)
- end = vma->vm_end;
- }
-}
-
-/*
- * Handle all unrecognised system calls.
- * 0x9f0000 - 0x9fffff are some more esoteric system calls
- */
-#define NR(x) ((__ARM_NR_##x) - __ARM_NR_BASE)
-asmlinkage int arm_syscall(int no, struct pt_regs *regs)
-{
- siginfo_t info;
-
- if ((no >> 16) != 0x9f)
- return bad_syscall(no, regs);
-
- switch (no & 0xffff) {
- case 0: /* branch through 0 */
- info.si_signo = SIGSEGV;
- info.si_errno = 0;
- info.si_code = SEGV_MAPERR;
- info.si_addr = NULL;
-
- force_sig_info(SIGSEGV, &info, current);
-
- die_if_kernel("branch through zero", regs, 0);
- return 0;
-
- case NR(breakpoint): /* SWI BREAK_POINT */
- ptrace_break(current, regs);
- return regs->ARM_r0;
-
- case NR(cacheflush):
- return 0;
-
- case NR(usr26):
- break;
-
- default:
- /* Calls 9f00xx..9f07ff are defined to return -ENOSYS
- if not implemented, rather than raising SIGILL. This
- way the calling program can gracefully determine whether
- a feature is supported. */
- if (no <= 0x7ff)
- return -ENOSYS;
- break;
- }
-#ifdef CONFIG_DEBUG_USER
- /*
- * experience shows that these seem to indicate that
- * something catastrophic has happened
- */
- printk("[%d] %s: arm syscall %d\n", current->pid, current->comm, no);
- dump_instr(regs);
- if (user_mode(regs)) {
- show_regs(regs);
- c_backtrace(regs->ARM_fp, processor_mode(regs));
- }
-#endif
- info.si_signo = SIGILL;
- info.si_errno = 0;
- info.si_code = ILL_ILLTRP;
- info.si_addr = (void *)instruction_pointer(regs) - 4;
-
- force_sig_info(SIGILL, &info, current);
- die_if_kernel("Oops", regs, no);
- return 0;
-}
-
-void __bad_xchg(volatile void *ptr, int size)
-{
- printk("xchg: bad data size: pc 0x%p, ptr 0x%p, size %d\n",
- __builtin_return_address(0), ptr, size);
- BUG();
-}
-
-/*
- * A data abort trap was taken, but we did not handle the instruction.
- * Try to abort the user program, or panic if it was the kernel.
- */
-asmlinkage void
-baddataabort(int code, unsigned long instr, struct pt_regs *regs)
-{
- unsigned long addr = instruction_pointer(regs);
- siginfo_t info;
-
-#ifdef CONFIG_DEBUG_USER
- printk(KERN_ERR "[%d] %s: bad data abort: code %d instr 0x%08lx\n",
- current->pid, current->comm, code, instr);
- dump_instr(regs);
- show_pte(current->mm, addr);
-#endif
-
- info.si_signo = SIGILL;
- info.si_errno = 0;
- info.si_code = ILL_ILLOPC;
- info.si_addr = (void *)addr;
-
- force_sig_info(SIGILL, &info, current);
- die_if_kernel("unknown data abort code", regs, instr);
-}
-
-volatile void __bug(const char *file, int line, void *data)
-{
- printk(KERN_CRIT"kernel BUG at %s:%d!", file, line);
- if (data)
- printk(KERN_CRIT" - extra data = %p", data);
- printk("\n");
- *(int *)0 = 0;
-}
-
-void __readwrite_bug(const char *fn)
-{
- printk("%s called, but not implemented", fn);
- BUG();
-}
-
-void __pte_error(const char *file, int line, unsigned long val)
-{
- printk("%s:%d: bad pte %08lx.\n", file, line, val);
-}
-
-void __pmd_error(const char *file, int line, unsigned long val)
-{
- printk("%s:%d: bad pmd %08lx.\n", file, line, val);
-}
-
-void __pgd_error(const char *file, int line, unsigned long val)
-{
- printk("%s:%d: bad pgd %08lx.\n", file, line, val);
-}
-
-asmlinkage void __div0(void)
-{
- printk("Division by zero in kernel.\n");
- dump_stack();
-}
-
-void abort(void)
-{
- BUG();
-
- /* if that doesn't kill us, halt */
- panic("Oops failed to kill thread");
-}
-
-void __init trap_init(void)
-{
- extern void __trap_init(unsigned long);
- unsigned long base = vectors_base();
-
- __trap_init(base);
- if (base != 0)
- printk(KERN_DEBUG "Relocating machine vectors to 0x%08lx\n",
- base);
-}
generated by cgit v1.2.3-18-g5258 (git 2.32.0) at 2024-11-23 07:01:33 +0000