You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
425 lines
9.1 KiB
425 lines
9.1 KiB
/*
|
|
* Copyright (C) 2004-2006 Atmel Corporation
|
|
*
|
|
* 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.
|
|
*/
|
|
#undef DEBUG
|
|
#include <linux/sched.h>
|
|
#include <linux/init.h>
|
|
#include <linux/module.h>
|
|
#include <linux/kallsyms.h>
|
|
#include <linux/notifier.h>
|
|
|
|
#include <asm/traps.h>
|
|
#include <asm/sysreg.h>
|
|
#include <asm/addrspace.h>
|
|
#include <asm/ocd.h>
|
|
#include <asm/mmu_context.h>
|
|
#include <asm/uaccess.h>
|
|
|
|
static void dump_mem(const char *str, unsigned long bottom, unsigned long top)
|
|
{
|
|
unsigned long p;
|
|
int i;
|
|
|
|
printk("%s(0x%08lx to 0x%08lx)\n", str, 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 {
|
|
if (__get_user(val, (unsigned int __user *)p)) {
|
|
printk("\n");
|
|
goto out;
|
|
}
|
|
printk("%08x ", val);
|
|
}
|
|
}
|
|
printk("\n");
|
|
}
|
|
|
|
out:
|
|
return;
|
|
}
|
|
|
|
#ifdef CONFIG_FRAME_POINTER
|
|
static inline void __show_trace(struct task_struct *tsk, unsigned long *sp,
|
|
struct pt_regs *regs)
|
|
{
|
|
unsigned long __user *fp;
|
|
unsigned long __user *last_fp = NULL;
|
|
|
|
if (regs) {
|
|
fp = (unsigned long __user *)regs->r7;
|
|
} else if (tsk == current) {
|
|
register unsigned long __user *real_fp __asm__("r7");
|
|
fp = real_fp;
|
|
} else {
|
|
fp = (unsigned long __user *)tsk->thread.cpu_context.r7;
|
|
}
|
|
|
|
/*
|
|
* Walk the stack until (a) we get an exception, (b) the frame
|
|
* pointer becomes zero, or (c) the frame pointer gets stuck
|
|
* at the same value.
|
|
*/
|
|
while (fp && fp != last_fp) {
|
|
unsigned long lr, new_fp = 0;
|
|
|
|
last_fp = fp;
|
|
if (__get_user(lr, fp))
|
|
break;
|
|
if (fp && __get_user(new_fp, fp + 1))
|
|
break;
|
|
fp = (unsigned long __user *)new_fp;
|
|
|
|
printk(" [<%08lx>] ", lr);
|
|
print_symbol("%s\n", lr);
|
|
}
|
|
printk("\n");
|
|
}
|
|
#else
|
|
static inline void __show_trace(struct task_struct *tsk, unsigned long *sp,
|
|
struct pt_regs *regs)
|
|
{
|
|
unsigned long addr;
|
|
|
|
while (!kstack_end(sp)) {
|
|
addr = *sp++;
|
|
if (kernel_text_address(addr)) {
|
|
printk(" [<%08lx>] ", addr);
|
|
print_symbol("%s\n", addr);
|
|
}
|
|
}
|
|
}
|
|
#endif
|
|
|
|
void show_trace(struct task_struct *tsk, unsigned long *sp,
|
|
struct pt_regs *regs)
|
|
{
|
|
if (regs &&
|
|
(((regs->sr & MODE_MASK) == MODE_EXCEPTION) ||
|
|
((regs->sr & MODE_MASK) == MODE_USER)))
|
|
return;
|
|
|
|
printk ("Call trace:");
|
|
#ifdef CONFIG_KALLSYMS
|
|
printk("\n");
|
|
#endif
|
|
|
|
__show_trace(tsk, sp, regs);
|
|
printk("\n");
|
|
}
|
|
|
|
void show_stack(struct task_struct *tsk, unsigned long *sp)
|
|
{
|
|
unsigned long stack;
|
|
|
|
if (!tsk)
|
|
tsk = current;
|
|
if (sp == 0) {
|
|
if (tsk == current) {
|
|
register unsigned long *real_sp __asm__("sp");
|
|
sp = real_sp;
|
|
} else {
|
|
sp = (unsigned long *)tsk->thread.cpu_context.ksp;
|
|
}
|
|
}
|
|
|
|
stack = (unsigned long)sp;
|
|
dump_mem("Stack: ", stack,
|
|
THREAD_SIZE + (unsigned long)tsk->thread_info);
|
|
show_trace(tsk, sp, NULL);
|
|
}
|
|
|
|
void dump_stack(void)
|
|
{
|
|
show_stack(NULL, NULL);
|
|
}
|
|
EXPORT_SYMBOL(dump_stack);
|
|
|
|
ATOMIC_NOTIFIER_HEAD(avr32_die_chain);
|
|
|
|
int register_die_notifier(struct notifier_block *nb)
|
|
{
|
|
pr_debug("register_die_notifier: %p\n", nb);
|
|
|
|
return atomic_notifier_chain_register(&avr32_die_chain, nb);
|
|
}
|
|
EXPORT_SYMBOL(register_die_notifier);
|
|
|
|
int unregister_die_notifier(struct notifier_block *nb)
|
|
{
|
|
return atomic_notifier_chain_unregister(&avr32_die_chain, nb);
|
|
}
|
|
EXPORT_SYMBOL(unregister_die_notifier);
|
|
|
|
static DEFINE_SPINLOCK(die_lock);
|
|
|
|
void __die(const char *str, struct pt_regs *regs, unsigned long err,
|
|
const char *file, const char *func, unsigned long line)
|
|
{
|
|
struct task_struct *tsk = current;
|
|
static int die_counter;
|
|
|
|
console_verbose();
|
|
spin_lock_irq(&die_lock);
|
|
bust_spinlocks(1);
|
|
|
|
printk(KERN_ALERT "%s", str);
|
|
if (file && func)
|
|
printk(" in %s:%s, line %ld", file, func, line);
|
|
printk("[#%d]:\n", ++die_counter);
|
|
print_modules();
|
|
show_regs(regs);
|
|
printk("Process %s (pid: %d, stack limit = 0x%p)\n",
|
|
tsk->comm, tsk->pid, tsk->thread_info + 1);
|
|
|
|
if (!user_mode(regs) || in_interrupt()) {
|
|
dump_mem("Stack: ", regs->sp,
|
|
THREAD_SIZE + (unsigned long)tsk->thread_info);
|
|
}
|
|
|
|
bust_spinlocks(0);
|
|
spin_unlock_irq(&die_lock);
|
|
do_exit(SIGSEGV);
|
|
}
|
|
|
|
void __die_if_kernel(const char *str, struct pt_regs *regs, unsigned long err,
|
|
const char *file, const char *func, unsigned long line)
|
|
{
|
|
if (!user_mode(regs))
|
|
__die(str, regs, err, file, func, line);
|
|
}
|
|
|
|
asmlinkage void do_nmi(unsigned long ecr, struct pt_regs *regs)
|
|
{
|
|
#ifdef CONFIG_SUBARCH_AVR32B
|
|
/*
|
|
* The exception entry always saves RSR_EX. For NMI, this is
|
|
* wrong; it should be RSR_NMI
|
|
*/
|
|
regs->sr = sysreg_read(RSR_NMI);
|
|
#endif
|
|
|
|
printk("NMI taken!!!!\n");
|
|
die("NMI", regs, ecr);
|
|
BUG();
|
|
}
|
|
|
|
asmlinkage void do_critical_exception(unsigned long ecr, struct pt_regs *regs)
|
|
{
|
|
printk("Unable to handle critical exception %lu at pc = %08lx!\n",
|
|
ecr, regs->pc);
|
|
die("Oops", regs, ecr);
|
|
BUG();
|
|
}
|
|
|
|
asmlinkage void do_address_exception(unsigned long ecr, struct pt_regs *regs)
|
|
{
|
|
siginfo_t info;
|
|
|
|
die_if_kernel("Oops: Address exception in kernel mode", regs, ecr);
|
|
|
|
#ifdef DEBUG
|
|
if (ecr == ECR_ADDR_ALIGN_X)
|
|
pr_debug("Instruction Address Exception at pc = %08lx\n",
|
|
regs->pc);
|
|
else if (ecr == ECR_ADDR_ALIGN_R)
|
|
pr_debug("Data Address Exception (Read) at pc = %08lx\n",
|
|
regs->pc);
|
|
else if (ecr == ECR_ADDR_ALIGN_W)
|
|
pr_debug("Data Address Exception (Write) at pc = %08lx\n",
|
|
regs->pc);
|
|
else
|
|
BUG();
|
|
|
|
show_regs(regs);
|
|
#endif
|
|
|
|
info.si_signo = SIGBUS;
|
|
info.si_errno = 0;
|
|
info.si_code = BUS_ADRALN;
|
|
info.si_addr = (void __user *)regs->pc;
|
|
|
|
force_sig_info(SIGBUS, &info, current);
|
|
}
|
|
|
|
/* This way of handling undefined instructions is stolen from ARM */
|
|
static LIST_HEAD(undef_hook);
|
|
static spinlock_t undef_lock = SPIN_LOCK_UNLOCKED;
|
|
|
|
void register_undef_hook(struct undef_hook *hook)
|
|
{
|
|
spin_lock_irq(&undef_lock);
|
|
list_add(&hook->node, &undef_hook);
|
|
spin_unlock_irq(&undef_lock);
|
|
}
|
|
|
|
void unregister_undef_hook(struct undef_hook *hook)
|
|
{
|
|
spin_lock_irq(&undef_lock);
|
|
list_del(&hook->node);
|
|
spin_unlock_irq(&undef_lock);
|
|
}
|
|
|
|
static int do_cop_absent(u32 insn)
|
|
{
|
|
int cop_nr;
|
|
u32 cpucr;
|
|
if ( (insn & 0xfdf00000) == 0xf1900000 )
|
|
/* LDC0 */
|
|
cop_nr = 0;
|
|
else
|
|
cop_nr = (insn >> 13) & 0x7;
|
|
|
|
/* Try enabling the coprocessor */
|
|
cpucr = sysreg_read(CPUCR);
|
|
cpucr |= (1 << (24 + cop_nr));
|
|
sysreg_write(CPUCR, cpucr);
|
|
|
|
cpucr = sysreg_read(CPUCR);
|
|
if ( !(cpucr & (1 << (24 + cop_nr))) ){
|
|
printk("Coprocessor #%i not found!\n", cop_nr);
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_BUG
|
|
#ifdef CONFIG_DEBUG_BUGVERBOSE
|
|
static inline void do_bug_verbose(struct pt_regs *regs, u32 insn)
|
|
{
|
|
char *file;
|
|
u16 line;
|
|
char c;
|
|
|
|
if (__get_user(line, (u16 __user *)(regs->pc + 2)))
|
|
return;
|
|
if (__get_user(file, (char * __user *)(regs->pc + 4))
|
|
|| (unsigned long)file < PAGE_OFFSET
|
|
|| __get_user(c, file))
|
|
file = "<bad filename>";
|
|
|
|
printk(KERN_ALERT "kernel BUG at %s:%d!\n", file, line);
|
|
}
|
|
#else
|
|
static inline void do_bug_verbose(struct pt_regs *regs, u32 insn)
|
|
{
|
|
|
|
}
|
|
#endif
|
|
#endif
|
|
|
|
asmlinkage void do_illegal_opcode(unsigned long ecr, struct pt_regs *regs)
|
|
{
|
|
u32 insn;
|
|
struct undef_hook *hook;
|
|
siginfo_t info;
|
|
void __user *pc;
|
|
|
|
if (!user_mode(regs))
|
|
goto kernel_trap;
|
|
|
|
local_irq_enable();
|
|
|
|
pc = (void __user *)instruction_pointer(regs);
|
|
if (__get_user(insn, (u32 __user *)pc))
|
|
goto invalid_area;
|
|
|
|
if (ecr == ECR_COPROC_ABSENT) {
|
|
if (do_cop_absent(insn) == 0)
|
|
return;
|
|
}
|
|
|
|
spin_lock_irq(&undef_lock);
|
|
list_for_each_entry(hook, &undef_hook, node) {
|
|
if ((insn & hook->insn_mask) == hook->insn_val) {
|
|
if (hook->fn(regs, insn) == 0) {
|
|
spin_unlock_irq(&undef_lock);
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
spin_unlock_irq(&undef_lock);
|
|
|
|
invalid_area:
|
|
|
|
#ifdef DEBUG
|
|
printk("Illegal instruction at pc = %08lx\n", regs->pc);
|
|
if (regs->pc < TASK_SIZE) {
|
|
unsigned long ptbr, pgd, pte, *p;
|
|
|
|
ptbr = sysreg_read(PTBR);
|
|
p = (unsigned long *)ptbr;
|
|
pgd = p[regs->pc >> 22];
|
|
p = (unsigned long *)((pgd & 0x1ffff000) | 0x80000000);
|
|
pte = p[(regs->pc >> 12) & 0x3ff];
|
|
printk("page table: 0x%08lx -> 0x%08lx -> 0x%08lx\n", ptbr, pgd, pte);
|
|
}
|
|
#endif
|
|
|
|
info.si_signo = SIGILL;
|
|
info.si_errno = 0;
|
|
info.si_addr = (void __user *)regs->pc;
|
|
switch (ecr) {
|
|
case ECR_ILLEGAL_OPCODE:
|
|
case ECR_UNIMPL_INSTRUCTION:
|
|
info.si_code = ILL_ILLOPC;
|
|
break;
|
|
case ECR_PRIVILEGE_VIOLATION:
|
|
info.si_code = ILL_PRVOPC;
|
|
break;
|
|
case ECR_COPROC_ABSENT:
|
|
info.si_code = ILL_COPROC;
|
|
break;
|
|
default:
|
|
BUG();
|
|
}
|
|
|
|
force_sig_info(SIGILL, &info, current);
|
|
return;
|
|
|
|
kernel_trap:
|
|
#ifdef CONFIG_BUG
|
|
if (__kernel_text_address(instruction_pointer(regs))) {
|
|
insn = *(u16 *)instruction_pointer(regs);
|
|
if (insn == AVR32_BUG_OPCODE) {
|
|
do_bug_verbose(regs, insn);
|
|
die("Kernel BUG", regs, 0);
|
|
return;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
die("Oops: Illegal instruction in kernel code", regs, ecr);
|
|
}
|
|
|
|
asmlinkage void do_fpe(unsigned long ecr, struct pt_regs *regs)
|
|
{
|
|
siginfo_t info;
|
|
|
|
printk("Floating-point exception at pc = %08lx\n", regs->pc);
|
|
|
|
/* We have no FPU... */
|
|
info.si_signo = SIGILL;
|
|
info.si_errno = 0;
|
|
info.si_addr = (void __user *)regs->pc;
|
|
info.si_code = ILL_COPROC;
|
|
|
|
force_sig_info(SIGILL, &info, current);
|
|
}
|
|
|
|
|
|
void __init trap_init(void)
|
|
{
|
|
|
|
}
|
|
|