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Commit | Line | Data |
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fd3e0bbc CH |
1 | /* |
2 | * Stack trace utility | |
3 | * | |
4 | * Copyright 2008 Christoph Hellwig, IBM Corp. | |
5 | * | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU General Public License | |
9 | * as published by the Free Software Foundation; either version | |
10 | * 2 of the License, or (at your option) any later version. | |
11 | */ | |
12 | ||
4b16f8e2 | 13 | #include <linux/export.h> |
fd3e0bbc | 14 | #include <linux/sched.h> |
b17b0153 | 15 | #include <linux/sched/debug.h> |
fd3e0bbc CH |
16 | #include <linux/stacktrace.h> |
17 | #include <asm/ptrace.h> | |
01f4b8b8 | 18 | #include <asm/processor.h> |
fd3e0bbc CH |
19 | |
20 | /* | |
21 | * Save stack-backtrace addresses into a stack_trace buffer. | |
22 | */ | |
01f4b8b8 AB |
23 | static void save_context_stack(struct stack_trace *trace, unsigned long sp, |
24 | struct task_struct *tsk, int savesched) | |
fd3e0bbc | 25 | { |
fd3e0bbc CH |
26 | for (;;) { |
27 | unsigned long *stack = (unsigned long *) sp; | |
28 | unsigned long newsp, ip; | |
29 | ||
01f4b8b8 | 30 | if (!validate_sp(sp, tsk, STACK_FRAME_OVERHEAD)) |
fd3e0bbc CH |
31 | return; |
32 | ||
33 | newsp = stack[0]; | |
34 | ip = stack[STACK_FRAME_LR_SAVE]; | |
35 | ||
01f4b8b8 AB |
36 | if (savesched || !in_sched_functions(ip)) { |
37 | if (!trace->skip) | |
38 | trace->entries[trace->nr_entries++] = ip; | |
39 | else | |
40 | trace->skip--; | |
41 | } | |
fd3e0bbc CH |
42 | |
43 | if (trace->nr_entries >= trace->max_entries) | |
44 | return; | |
45 | ||
46 | sp = newsp; | |
47 | } | |
48 | } | |
01f4b8b8 AB |
49 | |
50 | void save_stack_trace(struct stack_trace *trace) | |
51 | { | |
52 | unsigned long sp; | |
53 | ||
acf620ec | 54 | sp = current_stack_pointer(); |
01f4b8b8 AB |
55 | |
56 | save_context_stack(trace, sp, current, 1); | |
57 | } | |
58 | EXPORT_SYMBOL_GPL(save_stack_trace); | |
59 | ||
60 | void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace) | |
61 | { | |
4f9b514b TLSC |
62 | unsigned long sp; |
63 | ||
64 | if (tsk == current) | |
65 | sp = current_stack_pointer(); | |
66 | else | |
67 | sp = tsk->thread.ksp; | |
68 | ||
69 | save_context_stack(trace, sp, tsk, 0); | |
01f4b8b8 AB |
70 | } |
71 | EXPORT_SYMBOL_GPL(save_stack_trace_tsk); | |
35de3b1a SR |
72 | |
73 | void | |
74 | save_stack_trace_regs(struct pt_regs *regs, struct stack_trace *trace) | |
75 | { | |
76 | save_context_stack(trace, regs->gpr[1], current, 0); | |
77 | } | |
78 | EXPORT_SYMBOL_GPL(save_stack_trace_regs); |