projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| a17ae4c3 | 1 | // SPDX-License-Identifier: GPL-2.0 |
| 5bdc9b44 | 2 | /* |
| 5bdc9b44 HC |
3 | * Stack trace management functions |
| 4 | * | |
| a53c8fab | 5 | * Copyright IBM Corp. 2006 |
| 5bdc9b44 HC |
6 | * Author(s): Heiko Carstens <heiko.carstens@de.ibm.com> |
| 7 | */ | |
| 8 | ||
| 9 | #include <linux/sched.h> | |
| b17b0153 | 10 | #include <linux/sched/debug.h> |
| 5bdc9b44 HC |
11 | #include <linux/stacktrace.h> |
| 12 | #include <linux/kallsyms.h> | |
| 3994a52b | 13 | #include <linux/export.h> |
| 5bdc9b44 | 14 | |
| 758d39eb | 15 | static int __save_address(void *data, unsigned long address, int nosched) |
| 5bdc9b44 | 16 | { |
| 758d39eb | 17 | struct stack_trace *trace = data; |
| 5bdc9b44 | 18 | |
| 758d39eb HC |
19 | if (nosched && in_sched_functions(address)) |
| 20 | return 0; | |
| 21 | if (trace->skip > 0) { | |
| 22 | trace->skip--; | |
| 23 | return 0; | |
| 5bdc9b44 | 24 | } |
| 758d39eb HC |
25 | if (trace->nr_entries < trace->max_entries) { |
| 26 | trace->entries[trace->nr_entries++] = address; | |
| 27 | return 0; | |
| 28 | } | |
| 29 | return 1; | |
| 5bdc9b44 HC |
30 | } |
| 31 | ||
| d0208639 | 32 | static int save_address(void *data, unsigned long address, int reliable) |
| 5bdc9b44 | 33 | { |
| 758d39eb HC |
34 | return __save_address(data, address, 0); |
| 35 | } | |
| 5bdc9b44 | 36 | |
| d0208639 | 37 | static int save_address_nosched(void *data, unsigned long address, int reliable) |
| 758d39eb HC |
38 | { |
| 39 | return __save_address(data, address, 1); | |
| 66adce8f HC |
40 | } |
| 41 | ||
| 42 | void save_stack_trace(struct stack_trace *trace) | |
| 43 | { | |
| 66adce8f HC |
44 | unsigned long sp; |
| 45 | ||
| 76737ce1 | 46 | sp = current_stack_pointer(); |
| 758d39eb | 47 | dump_trace(save_address, trace, NULL, sp); |
| f6331aac HC |
48 | if (trace->nr_entries < trace->max_entries) |
| 49 | trace->entries[trace->nr_entries++] = ULONG_MAX; | |
| a3afe70b | 50 | } |
| 7b4c9505 | 51 | EXPORT_SYMBOL_GPL(save_stack_trace); |
| a3afe70b HC |
52 | |
| 53 | void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace) | |
| 54 | { | |
| 758d39eb | 55 | unsigned long sp; |
| a3afe70b | 56 | |
| 9cb1ccec | 57 | sp = tsk->thread.ksp; |
| 76737ce1 HC |
58 | if (tsk == current) |
| 59 | sp = current_stack_pointer(); | |
| 758d39eb | 60 | dump_trace(save_address_nosched, trace, tsk, sp); |
| a3afe70b HC |
61 | if (trace->nr_entries < trace->max_entries) |
| 62 | trace->entries[trace->nr_entries++] = ULONG_MAX; | |
| 5bdc9b44 | 63 | } |
| 7b4c9505 | 64 | EXPORT_SYMBOL_GPL(save_stack_trace_tsk); |
| e0115875 PA |
65 | |
| 66 | void save_stack_trace_regs(struct pt_regs *regs, struct stack_trace *trace) | |
| 67 | { | |
| 68 | unsigned long sp; | |
| 69 | ||
| 70 | sp = kernel_stack_pointer(regs); | |
| 758d39eb | 71 | dump_trace(save_address, trace, NULL, sp); |
| e0115875 PA |
72 | if (trace->nr_entries < trace->max_entries) |
| 73 | trace->entries[trace->nr_entries++] = ULONG_MAX; | |
| 74 | } | |
| 75 | EXPORT_SYMBOL_GPL(save_stack_trace_regs); |