arch/sh/kernel/stacktrace.c

   1 /*
   2  * arch/sh/kernel/stacktrace.c
   3  *
   4  * Stack trace management functions
   5  *
   6  *  Copyright (C) 2006 - 2008  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 <linux/module.h>
  16 #include <asm/ptrace.h>
  17
  18 /*
  19  * Save stack-backtrace addresses into a stack_trace buffer.
  20  */
  21 void save_stack_trace(struct stack_trace *trace)
  22 {
  23         unsigned long *sp = (unsigned long *)current_stack_pointer;
  24
  25         while (!kstack_end(sp)) {
  26                 unsigned long addr = *sp++;
  27
  28                 if (__kernel_text_address(addr)) {
  29                         if (trace->skip > 0)
  30                                 trace->skip--;
  31                         else
  32                                 trace->entries[trace->nr_entries++] = addr;
  33                         if (trace->nr_entries >= trace->max_entries)
  34                                 break;
  35                 }
  36         }
  37 }
  38 EXPORT_SYMBOL_GPL(save_stack_trace);
  39
  40 void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
  41 {
  42         unsigned long *sp = (unsigned long *)tsk->thread.sp;
  43
  44         while (!kstack_end(sp)) {
  45                 unsigned long addr = *sp++;
  46
  47                 if (__kernel_text_address(addr)) {
  48                         if (in_sched_functions(addr))
  49                                 break;
  50                         if (trace->skip > 0)
  51                                 trace->skip--;
  52                         else
  53                                 trace->entries[trace->nr_entries++] = addr;
  54                         if (trace->nr_entries >= trace->max_entries)
  55                                 break;
  56                 }
  57         }
  58 }
  59 EXPORT_SYMBOL_GPL(save_stack_trace_tsk);