You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
55 lines
1.2 KiB
55 lines
1.2 KiB
/*
|
|
* Stack trace management functions
|
|
*
|
|
* Copyright (C) 2007 Atmel Corporation
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
#include <linux/sched.h>
|
|
#include <linux/stacktrace.h>
|
|
#include <linux/thread_info.h>
|
|
#include <linux/module.h>
|
|
|
|
register unsigned long current_frame_pointer asm("r7");
|
|
|
|
struct stackframe {
|
|
unsigned long lr;
|
|
unsigned long fp;
|
|
};
|
|
|
|
/*
|
|
* Save stack-backtrace addresses into a stack_trace buffer.
|
|
*/
|
|
void save_stack_trace(struct stack_trace *trace)
|
|
{
|
|
unsigned long low, high;
|
|
unsigned long fp;
|
|
struct stackframe *frame;
|
|
int skip = trace->skip;
|
|
|
|
low = (unsigned long)task_stack_page(current);
|
|
high = low + THREAD_SIZE;
|
|
fp = current_frame_pointer;
|
|
|
|
while (fp >= low && fp <= (high - 8)) {
|
|
frame = (struct stackframe *)fp;
|
|
|
|
if (skip) {
|
|
skip--;
|
|
} else {
|
|
trace->entries[trace->nr_entries++] = frame->lr;
|
|
if (trace->nr_entries >= trace->max_entries)
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* The next frame must be at a higher address than the
|
|
* current frame.
|
|
*/
|
|
low = fp + 8;
|
|
fp = frame->fp;
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(save_stack_trace);
|
|
|