47 lines
987 B
C
47 lines
987 B
C
/*
|
|
* 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>
|
|
|
|
/*
|
|
* 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;
|
|
}
|
|
}
|