projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 5bdc9b44 | 1 | /* |
| 5bdc9b44 HC |
2 | * Stack trace management functions |
| 3 | * | |
| a53c8fab | 4 | * Copyright IBM Corp. 2006 |
| 5bdc9b44 HC |
5 | * Author(s): Heiko Carstens <heiko.carstens@de.ibm.com> |
| 6 | */ | |
| 7 | ||
| 8 | #include <linux/sched.h> | |
| 9 | #include <linux/stacktrace.h> | |
| 10 | #include <linux/kallsyms.h> | |
| 8de2ce86 | 11 | #include <linux/module.h> |
| 5bdc9b44 | 12 | |
| 758d39eb | 13 | static int __save_address(void *data, unsigned long address, int nosched) |
| 5bdc9b44 | 14 | { |
| 758d39eb | 15 | struct stack_trace *trace = data; |
| 5bdc9b44 | 16 | |
| 758d39eb HC |
17 | if (nosched && in_sched_functions(address)) |
| 18 | return 0; | |
| 19 | if (trace->skip > 0) { | |
| 20 | trace->skip--; | |
| 21 | return 0; | |
| 5bdc9b44 | 22 | } |
| 758d39eb HC |
23 | if (trace->nr_entries < trace->max_entries) { |
| 24 | trace->entries[trace->nr_entries++] = address; | |
| 25 | return 0; | |
| 26 | } | |
| 27 | return 1; | |
| 5bdc9b44 HC |
28 | } |
| 29 | ||
| d0208639 | 30 | static int save_address(void *data, unsigned long address, int reliable) |
| 5bdc9b44 | 31 | { |
| 758d39eb HC |
32 | return __save_address(data, address, 0); |
| 33 | } | |
| 5bdc9b44 | 34 | |
| d0208639 | 35 | static int save_address_nosched(void *data, unsigned long address, int reliable) |
| 758d39eb HC |
36 | { |
| 37 | return __save_address(data, address, 1); | |
| 66adce8f HC |
38 | } |
| 39 | ||
| 40 | void save_stack_trace(struct stack_trace *trace) | |
| 41 | { | |
| 66adce8f HC |
42 | unsigned long sp; |
| 43 | ||
| 76737ce1 | 44 | sp = current_stack_pointer(); |
| 758d39eb | 45 | dump_trace(save_address, trace, NULL, sp); |
| f6331aac HC |
46 | if (trace->nr_entries < trace->max_entries) |
| 47 | trace->entries[trace->nr_entries++] = ULONG_MAX; | |
| a3afe70b | 48 | } |
| 7b4c9505 | 49 | EXPORT_SYMBOL_GPL(save_stack_trace); |
| a3afe70b HC |
50 | |
| 51 | void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace) | |
| 52 | { | |
| 758d39eb | 53 | unsigned long sp; |
| a3afe70b | 54 | |
| 9cb1ccec | 55 | sp = tsk->thread.ksp; |
| 76737ce1 HC |
56 | if (tsk == current) |
| 57 | sp = current_stack_pointer(); | |
| 758d39eb | 58 | dump_trace(save_address_nosched, trace, tsk, sp); |
| a3afe70b HC |
59 | if (trace->nr_entries < trace->max_entries) |
| 60 | trace->entries[trace->nr_entries++] = ULONG_MAX; | |
| 5bdc9b44 | 61 | } |
| 7b4c9505 | 62 | EXPORT_SYMBOL_GPL(save_stack_trace_tsk); |
| e0115875 PA |
63 | |
| 64 | void save_stack_trace_regs(struct pt_regs *regs, struct stack_trace *trace) | |
| 65 | { | |
| 66 | unsigned long sp; | |
| 67 | ||
| 68 | sp = kernel_stack_pointer(regs); | |
| 758d39eb | 69 | dump_trace(save_address, trace, NULL, sp); |
| e0115875 PA |
70 | if (trace->nr_entries < trace->max_entries) |
| 71 | trace->entries[trace->nr_entries++] = ULONG_MAX; | |
| 72 | } | |
| 73 | EXPORT_SYMBOL_GPL(save_stack_trace_regs); |