Commit | Line | Data |
---|---|---|
21b32bbf | 1 | /* |
21b32bbf IM |
2 | * Stack trace management functions |
3 | * | |
4 | * Copyright (C) 2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com> | |
5 | */ | |
6 | #include <linux/sched.h> | |
7 | #include <linux/stacktrace.h> | |
c0b766f1 AK |
8 | #include <linux/module.h> |
9 | #include <asm/stacktrace.h> | |
21b32bbf | 10 | |
c0b766f1 | 11 | static void save_stack_warning(void *data, char *msg) |
21b32bbf | 12 | { |
21b32bbf IM |
13 | } |
14 | ||
c0b766f1 AK |
15 | static void |
16 | save_stack_warning_symbol(void *data, char *msg, unsigned long symbol) | |
21b32bbf | 17 | { |
21b32bbf IM |
18 | } |
19 | ||
c0b766f1 | 20 | static int save_stack_stack(void *data, char *name) |
21b32bbf | 21 | { |
ab1b6f03 | 22 | return -1; |
c0b766f1 | 23 | } |
21b32bbf | 24 | |
bc850d6b | 25 | static void save_stack_address(void *data, unsigned long addr, int reliable) |
c0b766f1 | 26 | { |
ade1af77 | 27 | struct stack_trace *trace = data; |
1650743c VN |
28 | if (!reliable) |
29 | return; | |
c0b766f1 AK |
30 | if (trace->skip > 0) { |
31 | trace->skip--; | |
32 | return; | |
21b32bbf | 33 | } |
006e84ee | 34 | if (trace->nr_entries < trace->max_entries) |
c0b766f1 | 35 | trace->entries[trace->nr_entries++] = addr; |
21b32bbf IM |
36 | } |
37 | ||
5bc27dc2 AV |
38 | static void |
39 | save_stack_address_nosched(void *data, unsigned long addr, int reliable) | |
9745512c AV |
40 | { |
41 | struct stack_trace *trace = (struct stack_trace *)data; | |
1650743c VN |
42 | if (!reliable) |
43 | return; | |
9745512c AV |
44 | if (in_sched_functions(addr)) |
45 | return; | |
46 | if (trace->skip > 0) { | |
47 | trace->skip--; | |
48 | return; | |
49 | } | |
50 | if (trace->nr_entries < trace->max_entries) | |
51 | trace->entries[trace->nr_entries++] = addr; | |
52 | } | |
53 | ||
9689ba8a | 54 | static const struct stacktrace_ops save_stack_ops = { |
c0b766f1 AK |
55 | .warning = save_stack_warning, |
56 | .warning_symbol = save_stack_warning_symbol, | |
57 | .stack = save_stack_stack, | |
58 | .address = save_stack_address, | |
59 | }; | |
21b32bbf | 60 | |
9745512c AV |
61 | static const struct stacktrace_ops save_stack_ops_nosched = { |
62 | .warning = save_stack_warning, | |
63 | .warning_symbol = save_stack_warning_symbol, | |
64 | .stack = save_stack_stack, | |
65 | .address = save_stack_address_nosched, | |
66 | }; | |
67 | ||
21b32bbf IM |
68 | /* |
69 | * Save stack-backtrace addresses into a stack_trace buffer. | |
21b32bbf | 70 | */ |
ab1b6f03 | 71 | void save_stack_trace(struct stack_trace *trace) |
21b32bbf | 72 | { |
5bc27dc2 | 73 | dump_trace(current, NULL, NULL, 0, &save_stack_ops, trace); |
006e84ee CM |
74 | if (trace->nr_entries < trace->max_entries) |
75 | trace->entries[trace->nr_entries++] = ULONG_MAX; | |
21b32bbf | 76 | } |
9745512c AV |
77 | |
78 | void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace) | |
79 | { | |
5bc27dc2 | 80 | dump_trace(tsk, NULL, NULL, 0, &save_stack_ops_nosched, trace); |
9745512c AV |
81 | if (trace->nr_entries < trace->max_entries) |
82 | trace->entries[trace->nr_entries++] = ULONG_MAX; | |
83 | } |