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xtensa: add stacktrace support

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Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Signed-off-by: Chris Zankel <chris@zankel.net>
This commit is contained in:
Max Filippov
2013-04-15 09:20:48 +04:00
committed by Chris Zankel
parent 4e96274e2b
commit 3e4196a5cc
5 changed files with 140 additions and 41 deletions
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49
arch/xtensa/kernel/traps.c
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@@ -11,7 +11,7 @@
*
* Essentially rewritten for the Xtensa architecture port.
*
* Copyright (C) 2001 - 2005 Tensilica Inc.
* Copyright (C) 2001 - 2013 Tensilica Inc.
*
* Joe Taylor <joe@tensilica.com, joetylr@yahoo.com>
* Chris Zankel <chris@zankel.net>
@@ -32,6 +32,7 @@
#include <linux/delay.h>
#include <linux/hardirq.h>
#include <asm/stacktrace.h>
#include <asm/ptrace.h>
#include <asm/timex.h>
#include <asm/uaccess.h>
@@ -402,53 +403,25 @@ void show_regs(struct pt_regs * regs)
regs->syscall);
}
static __always_inline unsigned long *stack_pointer(struct task_struct *task)
static int show_trace_cb(struct stackframe *frame, void *data)
{
unsigned long *sp;
if (!task || task == current)
__asm__ __volatile__ ("mov %0, a1\n" : "=a"(sp));
else
sp = (unsigned long *)task->thread.sp;
return sp;
if (kernel_text_address(frame->pc)) {
printk(" [<%08lx>] ", frame->pc);
print_symbol("%s\n", frame->pc);
}
return 0;
}
void show_trace(struct task_struct *task, unsigned long *sp)
{
unsigned long a0, a1, pc;
unsigned long sp_start, sp_end;
if (sp)
a1 = (unsigned long)sp;
else
a1 = (unsigned long)stack_pointer(task);
sp_start = a1 & ~(THREAD_SIZE-1);
sp_end = sp_start + THREAD_SIZE;
if (!sp)
sp = stack_pointer(task);
printk("Call Trace:");
#ifdef CONFIG_KALLSYMS
printk("\n");
#endif
spill_registers();
while (a1 > sp_start && a1 < sp_end) {
sp = (unsigned long*)a1;
a0 = *(sp - 4);
a1 = *(sp - 3);
if (a1 <= (unsigned long) sp)
break;
pc = MAKE_PC_FROM_RA(a0, a1);
if (kernel_text_address(pc)) {
printk(" [<%08lx>] ", pc);
print_symbol("%s\n", pc);
}
}
walk_stackframe(sp, show_trace_cb, NULL);
printk("\n");
}