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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 <linux/module.h>
#include <asm/ptrace.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;
}
}
EXPORT_SYMBOL_GPL(save_stack_trace);
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