diff options
Diffstat (limited to 'arch/arm26/kernel/traps.c')
| -rw-r--r-- | arch/arm26/kernel/traps.c | 548 |
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 2911e2e..0000000 --- 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); -} |
