simplify the stacktrace code
[linux-3.10.git] / 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 = (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 }