/*
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* Stack trace management functions
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*
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* Copyright (C) 2007 Atmel Corporation
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/sched.h>
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#include <linux/stacktrace.h>
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#include <linux/thread_info.h>
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#include <linux/module.h>
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register unsigned long current_frame_pointer asm("r7");
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struct stackframe {
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unsigned long lr;
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unsigned long fp;
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};
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/*
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* Save stack-backtrace addresses into a stack_trace buffer.
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*/
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void save_stack_trace(struct stack_trace *trace)
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{
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unsigned long low, high;
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unsigned long fp;
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struct stackframe *frame;
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int skip = trace->skip;
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low = (unsigned long)task_stack_page(current);
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high = low + THREAD_SIZE;
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fp = current_frame_pointer;
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while (fp >= low && fp <= (high - 8)) {
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frame = (struct stackframe *)fp;
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if (skip) {
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skip--;
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} else {
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trace->entries[trace->nr_entries++] = frame->lr;
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if (trace->nr_entries >= trace->max_entries)
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break;
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}
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/*
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* The next frame must be at a higher address than the
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* current frame.
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*/
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low = fp + 8;
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fp = frame->fp;
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}
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}
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EXPORT_SYMBOL_GPL(save_stack_trace);
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