Root/arch/avr32/kernel/stacktrace.c

1/*
2 * Stack trace management functions
3 *
4 * Copyright (C) 2007 Atmel Corporation
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10#include <linux/sched.h>
11#include <linux/stacktrace.h>
12#include <linux/thread_info.h>
13#include <linux/module.h>
14
15register unsigned long current_frame_pointer asm("r7");
16
17struct stackframe {
18    unsigned long lr;
19    unsigned long fp;
20};
21
22/*
23 * Save stack-backtrace addresses into a stack_trace buffer.
24 */
25void save_stack_trace(struct stack_trace *trace)
26{
27    unsigned long low, high;
28    unsigned long fp;
29    struct stackframe *frame;
30    int skip = trace->skip;
31
32    low = (unsigned long)task_stack_page(current);
33    high = low + THREAD_SIZE;
34    fp = current_frame_pointer;
35
36    while (fp >= low && fp <= (high - 8)) {
37        frame = (struct stackframe *)fp;
38
39        if (skip) {
40            skip--;
41        } else {
42            trace->entries[trace->nr_entries++] = frame->lr;
43            if (trace->nr_entries >= trace->max_entries)
44                break;
45        }
46
47        /*
48         * The next frame must be at a higher address than the
49         * current frame.
50         */
51        low = fp + 8;
52        fp = frame->fp;
53    }
54}
55EXPORT_SYMBOL_GPL(save_stack_trace);
56

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