LXR linux/arch/sh/kernel/stacktrace.c

   1/*
   2 * arch/sh/kernel/stacktrace.c
   3 *
   4 * Stack trace management functions
   5 *
   6 *  Copyright (C) 2006  Paul Mundt
   7 *
   8 * This file is subject to the terms and conditions of the GNU General Public
   9 * License.  See the file "COPYING" in the main directory of this archive
  10 * for more details.
  11 */
  12#include <linux/sched.h>
  13#include <linux/stacktrace.h>
  14#include <linux/thread_info.h>
  15#include <asm/ptrace.h>
  16
  17/*
  18 * Save stack-backtrace addresses into a stack_trace buffer.
  19 */
  20void save_stack_trace(struct stack_trace *trace)
  21{
  22        unsigned long *sp = (unsigned long *)current_stack_pointer;
  23
  24        while (!kstack_end(sp)) {
  25                unsigned long addr = *sp++;
  26
  27                if (__kernel_text_address(addr)) {
  28                        if (trace->skip > 0)
  29                                trace->skip--;
  30                        else
  31                                trace->entries[trace->nr_entries++] = addr;
  32                        if (trace->nr_entries >= trace->max_entries)
  33                                break;
  34                }
  35        }
  36}
  37