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[POWERPC] Stacktrace support for lockdep

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This adds stacktrace support for powerpc, which will be needed for
lockdep.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Christoph Hellwig 2008-04-17 14:35:00 +10:00 • committed by Paul Mackerras
parent ec2b36b9f2
commit fd3e0bbc60
3 changed files with 52 additions and 0 deletions
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47
arch/powerpc/kernel/stacktrace.c Normal file
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/*
* Stack trace utility
*
* Copyright 2008 Christoph Hellwig, IBM Corp.
*
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#include <linux/sched.h>
#include <linux/stacktrace.h>
#include <asm/ptrace.h>
#include <asm/asm-offsets.h>
/*
* Save stack-backtrace addresses into a stack_trace buffer.
*/
void save_stack_trace(struct stack_trace *trace)
{
unsigned long sp;
asm("mr %0,1" : "=r" (sp));
for (;;) {
unsigned long *stack = (unsigned long *) sp;
unsigned long newsp, ip;
if (!validate_sp(sp, current, STACK_FRAME_OVERHEAD))
return;
newsp = stack[0];
ip = stack[STACK_FRAME_LR_SAVE];
if (!trace->skip)
trace->entries[trace->nr_entries++] = ip;
else
trace->skip--;
if (trace->nr_entries >= trace->max_entries)
return;
sp = newsp;
}
}