Merge branch 'master' into for-2.6.31
[linux-2.6] / arch / sparc / kernel / stacktrace.c
1 #include <linux/sched.h>
2 #include <linux/stacktrace.h>
3 #include <linux/thread_info.h>
4 #include <linux/module.h>
5 #include <asm/ptrace.h>
6 #include <asm/stacktrace.h>
7
8 #include "kstack.h"
9
10 static void __save_stack_trace(struct thread_info *tp,
11                                struct stack_trace *trace,
12                                bool skip_sched)
13 {
14         unsigned long ksp, fp;
15
16         if (tp == current_thread_info()) {
17                 stack_trace_flush();
18                 __asm__ __volatile__("mov %%fp, %0" : "=r" (ksp));
19         } else {
20                 ksp = tp->ksp;
21         }
22
23         fp = ksp + STACK_BIAS;
24         do {
25                 struct sparc_stackf *sf;
26                 struct pt_regs *regs;
27                 unsigned long pc;
28
29                 if (!kstack_valid(tp, fp))
30                         break;
31
32                 sf = (struct sparc_stackf *) fp;
33                 regs = (struct pt_regs *) (sf + 1);
34
35                 if (kstack_is_trap_frame(tp, regs)) {
36                         if (!(regs->tstate & TSTATE_PRIV))
37                                 break;
38                         pc = regs->tpc;
39                         fp = regs->u_regs[UREG_I6] + STACK_BIAS;
40                 } else {
41                         pc = sf->callers_pc;
42                         fp = (unsigned long)sf->fp + STACK_BIAS;
43                 }
44
45                 if (trace->skip > 0)
46                         trace->skip--;
47                 else if (!skip_sched || !in_sched_functions(pc))
48                         trace->entries[trace->nr_entries++] = pc;
49         } while (trace->nr_entries < trace->max_entries);
50 }
51
52 void save_stack_trace(struct stack_trace *trace)
53 {
54         __save_stack_trace(current_thread_info(), trace, false);
55 }
56 EXPORT_SYMBOL_GPL(save_stack_trace);
57
58 void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
59 {
60         struct thread_info *tp = task_thread_info(tsk);
61
62         __save_stack_trace(tp, trace, true);
63 }
64 EXPORT_SYMBOL_GPL(save_stack_trace_tsk);