Merge tag 'r8169-upstream-20061204-00' of git://electric-eye.fr.zoreil.com/home/romie...
[linux-2.6] / 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  */
20 void save_stack_trace(struct stack_trace *trace, struct task_struct *task)
21 {
22         unsigned long *sp;
23
24         if (!task)
25                 task = current;
26         if (task == current)
27                 sp = (unsigned long *)current_stack_pointer;
28         else
29                 sp = (unsigned long *)task->thread.sp;
30
31         while (!kstack_end(sp)) {
32                 unsigned long addr = *sp++;
33
34                 if (__kernel_text_address(addr)) {
35                         if (trace->skip > 0)
36                                 trace->skip--;
37                         else
38                                 trace->entries[trace->nr_entries++] = addr;
39                         if (trace->nr_entries >= trace->max_entries)
40                                 break;
41                 }
42         }
43 }