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csky: stacktrace supported.

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The gcc option "-mbacktrace" will push fp(r8),lr into stack and we could
unwind the stack with:
	fp = *fp
	lr = (unsigned int *)fp[1]

Signed-off-by: Guo Ren <ren_guo@c-sky.com>
This commit is contained in:
Guo Ren
2018-12-09 14:18:05 +08:00
parent 859e5f45cb
commit 0ea2dc7cd6
6 changed files with 86 additions and 12 deletions
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arch/csky/kernel/process.c
+17 -12
View File
@@ -93,26 +93,31 @@ int dump_task_regs(struct task_struct *tsk, elf_gregset_t *pr_regs)
unsigned long get_wchan(struct task_struct *p)
{
unsigned long esp, pc;
unsigned long stack_page;
unsigned long lr;
unsigned long *fp, *stack_start, *stack_end;
int count = 0;
if (!p || p == current || p->state == TASK_RUNNING)
return 0;
stack_page = (unsigned long)p;
esp = p->thread.esp0;
stack_start = (unsigned long *)end_of_stack(p);
stack_end = (unsigned long *)(task_stack_page(p) + THREAD_SIZE);
fp = (unsigned long *) thread_saved_fp(p);
do {
if (esp < stack_page+sizeof(struct task_struct) ||
esp >= 8184+stack_page)
if (fp < stack_start || fp > stack_end)
return 0;
/*FIXME: There's may be error here!*/
pc = ((unsigned long *)esp)[1];
/* FIXME: This depends on the order of these functions. */
if (!in_sched_functions(pc))
return pc;
esp = *(unsigned long *) esp;
#ifdef CONFIG_STACKTRACE
lr = fp[1];
fp = (unsigned long *)fp[0];
#else
lr = *fp++;
#endif
if (!in_sched_functions(lr) &&
__kernel_text_address(lr))
return lr;
} while (count++ < 16);
return 0;
}
EXPORT_SYMBOL(get_wchan);