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xtensa: use correct stack pointer for stack traces

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Right now, the xtensa stacktrace code reads the _current_ kernel stack
pointer if nothing is supplied.  With debugging facilities like sysrq
this means that the backtrace of the sysrq-handler is printed instead
of a trace of the given task's stack.

When no stack pointer is specified in show_trace() and show_stack(),
use the stack pointer that comes with the handed in task descriptor to
make stack traces more useful.

Signed-off-by: Johannes Weiner <jw@emlix.com>
Signed-off-by: Chris Zankel <chris@zankel.net>
This commit is contained in:
Johannes Weiner 2009-03-04 16:21:29 +01:00 committed by Chris Zankel
parent 35f9cd083b
commit 28a0ce7f64
1 changed files with 6 additions and 8 deletions
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14
arch/xtensa/kernel/traps.c
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@ -372,11 +372,10 @@ void show_trace(struct task_struct *task, unsigned long *sp)
unsigned long a0, a1, pc;
unsigned long sp_start, sp_end;
a1 = (unsigned long)sp;
if (a1 == 0)
__asm__ __volatile__ ("mov %0, a1\n" : "=a"(a1));
if (sp)
a1 = (unsigned long)sp;
else
a1 = task->thread.sp;
sp_start = a1 & ~(THREAD_SIZE-1);
sp_end = sp_start + THREAD_SIZE;
@ -418,9 +417,8 @@ void show_stack(struct task_struct *task, unsigned long *sp)
int i = 0;
unsigned long *stack;
if (sp == 0)
__asm__ __volatile__ ("mov %0, a1\n" : "=a"(sp));
if (!sp)
sp = (unsigned long *)task->thread.sp;
stack = sp;
printk("\nStack: ");