projects / mirror_ubuntu-artful-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| afbfb52e PM |
1 | /* |
| 2 | * arch/sh/kernel/stacktrace.c | |
| 3 | * | |
| 4 | * Stack trace management functions | |
| 5 | * | |
| 5a89f1ad | 6 | * Copyright (C) 2006 - 2008 Paul Mundt |
| afbfb52e PM |
7 | * |
| 8 | * This file is subject to the terms and conditions of the GNU General Public | |
| 9 | * License. See the file "COPYING" in the main directory of this archive | |
| 10 | * for more details. | |
| 11 | */ | |
| 12 | #include <linux/sched.h> | |
| b17b0153 | 13 | #include <linux/sched/debug.h> |
| afbfb52e PM |
14 | #include <linux/stacktrace.h> |
| 15 | #include <linux/thread_info.h> | |
| 8b95d917 | 16 | #include <linux/module.h> |
| 0eff9f66 | 17 | #include <asm/unwinder.h> |
| afbfb52e | 18 | #include <asm/ptrace.h> |
| 4e14dfc7 MF |
19 | #include <asm/stacktrace.h> |
| 20 | ||
| 4e14dfc7 MF |
21 | static int save_stack_stack(void *data, char *name) |
| 22 | { | |
| 23 | return 0; | |
| 24 | } | |
| afbfb52e PM |
25 | |
| 26 | /* | |
| 27 | * Save stack-backtrace addresses into a stack_trace buffer. | |
| 28 | */ | |
| 4e14dfc7 MF |
29 | static void save_stack_address(void *data, unsigned long addr, int reliable) |
| 30 | { | |
| 31 | struct stack_trace *trace = data; | |
| 32 | ||
| 48e4d460 PM |
33 | if (!reliable) |
| 34 | return; | |
| 35 | ||
| 4e14dfc7 MF |
36 | if (trace->skip > 0) { |
| 37 | trace->skip--; | |
| 38 | return; | |
| 39 | } | |
| 40 | ||
| 41 | if (trace->nr_entries < trace->max_entries) | |
| 42 | trace->entries[trace->nr_entries++] = addr; | |
| 43 | } | |
| 44 | ||
| 45 | static const struct stacktrace_ops save_stack_ops = { | |
| 4e14dfc7 MF |
46 | .stack = save_stack_stack, |
| 47 | .address = save_stack_address, | |
| 48 | }; | |
| 49 | ||
| a3cf4ea8 | 50 | void save_stack_trace(struct stack_trace *trace) |
| afbfb52e | 51 | { |
| ab1b6f03 | 52 | unsigned long *sp = (unsigned long *)current_stack_pointer; |
| afbfb52e | 53 | |
| 0eff9f66 | 54 | unwind_stack(current, NULL, sp, &save_stack_ops, trace); |
| 606b4c99 PM |
55 | if (trace->nr_entries < trace->max_entries) |
| 56 | trace->entries[trace->nr_entries++] = ULONG_MAX; | |
| afbfb52e | 57 | } |
| 7b4c9505 | 58 | EXPORT_SYMBOL_GPL(save_stack_trace); |
| 5a89f1ad | 59 | |
| 4e14dfc7 MF |
60 | static void |
| 61 | save_stack_address_nosched(void *data, unsigned long addr, int reliable) | |
| 62 | { | |
| 63 | struct stack_trace *trace = (struct stack_trace *)data; | |
| 64 | ||
| 48e4d460 PM |
65 | if (!reliable) |
| 66 | return; | |
| 67 | ||
| 4e14dfc7 MF |
68 | if (in_sched_functions(addr)) |
| 69 | return; | |
| 70 | ||
| 71 | if (trace->skip > 0) { | |
| 72 | trace->skip--; | |
| 73 | return; | |
| 74 | } | |
| 75 | ||
| 76 | if (trace->nr_entries < trace->max_entries) | |
| 77 | trace->entries[trace->nr_entries++] = addr; | |
| 78 | } | |
| 79 | ||
| 80 | static const struct stacktrace_ops save_stack_ops_nosched = { | |
| 4e14dfc7 MF |
81 | .stack = save_stack_stack, |
| 82 | .address = save_stack_address_nosched, | |
| 83 | }; | |
| 84 | ||
| 5a89f1ad PM |
85 | void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace) |
| 86 | { | |
| 87 | unsigned long *sp = (unsigned long *)tsk->thread.sp; | |
| 88 | ||
| 0eff9f66 | 89 | unwind_stack(current, NULL, sp, &save_stack_ops_nosched, trace); |
| 606b4c99 PM |
90 | if (trace->nr_entries < trace->max_entries) |
| 91 | trace->entries[trace->nr_entries++] = ULONG_MAX; | |
| 5a89f1ad PM |
92 | } |
| 93 | EXPORT_SYMBOL_GPL(save_stack_trace_tsk); |