projects / mirror_ubuntu-artful-kernel.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> | |
| b17b0153 | 9 | #include <linux/sched/debug.h> |
| 5bdc9b44 HC |
10 | #include <linux/stacktrace.h> |
| 11 | #include <linux/kallsyms.h> | |
| 3994a52b | 12 | #include <linux/export.h> |
| 5bdc9b44 | 13 | |
| 758d39eb | 14 | static int __save_address(void *data, unsigned long address, int nosched) |
| 5bdc9b44 | 15 | { |
| 758d39eb | 16 | struct stack_trace *trace = data; |
| 5bdc9b44 | 17 | |
| 758d39eb HC |
18 | if (nosched && in_sched_functions(address)) |
| 19 | return 0; | |
| 20 | if (trace->skip > 0) { | |
| 21 | trace->skip--; | |
| 22 | return 0; | |
| 5bdc9b44 | 23 | } |
| 758d39eb HC |
24 | if (trace->nr_entries < trace->max_entries) { |
| 25 | trace->entries[trace->nr_entries++] = address; | |
| 26 | return 0; | |
| 27 | } | |
| 28 | return 1; | |
| 5bdc9b44 HC |
29 | } |
| 30 | ||
| d0208639 | 31 | static int save_address(void *data, unsigned long address, int reliable) |
| 5bdc9b44 | 32 | { |
| 758d39eb HC |
33 | return __save_address(data, address, 0); |
| 34 | } | |
| 5bdc9b44 | 35 | |
| d0208639 | 36 | static int save_address_nosched(void *data, unsigned long address, int reliable) |
| 758d39eb HC |
37 | { |
| 38 | return __save_address(data, address, 1); | |
| 66adce8f HC |
39 | } |
| 40 | ||
| 41 | void save_stack_trace(struct stack_trace *trace) | |
| 42 | { | |
| 66adce8f HC |
43 | unsigned long sp; |
| 44 | ||
| 76737ce1 | 45 | sp = current_stack_pointer(); |
| 758d39eb | 46 | dump_trace(save_address, trace, NULL, sp); |
| f6331aac HC |
47 | if (trace->nr_entries < trace->max_entries) |
| 48 | trace->entries[trace->nr_entries++] = ULONG_MAX; | |
| a3afe70b | 49 | } |
| 7b4c9505 | 50 | EXPORT_SYMBOL_GPL(save_stack_trace); |
| a3afe70b HC |
51 | |
| 52 | void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace) | |
| 53 | { | |
| 758d39eb | 54 | unsigned long sp; |
| a3afe70b | 55 | |
| 9cb1ccec | 56 | sp = tsk->thread.ksp; |
| 76737ce1 HC |
57 | if (tsk == current) |
| 58 | sp = current_stack_pointer(); | |
| 758d39eb | 59 | dump_trace(save_address_nosched, trace, tsk, sp); |
| a3afe70b HC |
60 | if (trace->nr_entries < trace->max_entries) |
| 61 | trace->entries[trace->nr_entries++] = ULONG_MAX; | |
| 5bdc9b44 | 62 | } |
| 7b4c9505 | 63 | EXPORT_SYMBOL_GPL(save_stack_trace_tsk); |
| e0115875 PA |
64 | |
| 65 | void save_stack_trace_regs(struct pt_regs *regs, struct stack_trace *trace) | |
| 66 | { | |
| 67 | unsigned long sp; | |
| 68 | ||
| 69 | sp = kernel_stack_pointer(regs); | |
| 758d39eb | 70 | dump_trace(save_address, trace, NULL, sp); |
| e0115875 PA |
71 | if (trace->nr_entries < trace->max_entries) |
| 72 | trace->entries[trace->nr_entries++] = ULONG_MAX; | |
| 73 | } | |
| 74 | EXPORT_SYMBOL_GPL(save_stack_trace_regs); |