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stacktrace.c

/*
 * 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>

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;
      }
}

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