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[ARM] Add ability to dump exception stacks to kernel backtraces

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Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King
2007-03-02 15:01:36 +00:00
committed by Russell King
parent 46fcc86dd7
commit 7ab3f8d595
6 changed files with 101 additions and 85 deletions
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2
arch/arm/kernel/irq.c
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@@ -109,7 +109,7 @@ static struct irq_desc bad_irq_desc = {
* come via this function. Instead, they should provide their
* own 'handler'
*/
asmlinkage void asm_do_IRQ(unsigned int irq, struct pt_regs *regs)
asmlinkage void __exception asm_do_IRQ(unsigned int irq, struct pt_regs *regs)
{
struct pt_regs *old_regs = set_irq_regs(regs);
struct irq_desc *desc = irq_desc + irq;

18
arch/arm/kernel/traps.c
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@@ -45,7 +45,18 @@ static int __init user_debug_setup(char *str)
__setup("user_debug=", user_debug_setup);
#endif
void dump_backtrace_entry(unsigned long where, unsigned long from)
static void dump_mem(const char *str, unsigned long bottom, unsigned long top);
static inline int in_exception_text(unsigned long ptr)
{
extern char __exception_text_start[];
extern char __exception_text_end[];
return ptr >= (unsigned long)&__exception_text_start &&
ptr < (unsigned long)&__exception_text_end;
}
void dump_backtrace_entry(unsigned long where, unsigned long from, unsigned long frame)
{
#ifdef CONFIG_KALLSYMS
printk("[<%08lx>] ", where);
@@ -55,6 +66,9 @@ void dump_backtrace_entry(unsigned long where, unsigned long from)
#else
printk("Function entered at [<%08lx>] from [<%08lx>]\n", where, from);
#endif
if (in_exception_text(where))
dump_mem("Exception stack", frame + 4, frame + 4 + sizeof(struct pt_regs));
}
/*
@@ -266,7 +280,7 @@ void unregister_undef_hook(struct undef_hook *hook)
spin_unlock_irqrestore(&undef_lock, flags);
}
asmlinkage void do_undefinstr(struct pt_regs *regs)
asmlinkage void __exception do_undefinstr(struct pt_regs *regs)
{
unsigned int correction = thumb_mode(regs) ? 2 : 4;
unsigned int instr;

3
arch/arm/kernel/vmlinux.lds.S
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@@ -83,6 +83,9 @@ SECTIONS
.text : { /* Real text segment */
_text = .; /* Text and read-only data */
__exception_text_start = .;
*(.exception.text)
__exception_text_end = .;
*(.text)
SCHED_TEXT
LOCK_TEXT