Merge branch 'drm-next' of git://git.kernel.org/pub/scm/linux/kernel/git/airlied...
[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 - 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);