projects / mirror_ubuntu-bionic-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> | |
| 13 | #include <linux/stacktrace.h> | |
| 14 | #include <linux/thread_info.h> | |
| 8b95d917 | 15 | #include <linux/module.h> |
| 0eff9f66 | 16 | #include <asm/unwinder.h> |
| afbfb52e | 17 | #include <asm/ptrace.h> |
| 4e14dfc7 MF |
18 | #include <asm/stacktrace.h> |
| 19 | ||
| 4e14dfc7 MF |
20 | static int save_stack_stack(void *data, char *name) |
| 21 | { | |
| 22 | return 0; | |
| 23 | } | |
| afbfb52e PM |
24 | |
| 25 | /* | |
| 26 | * Save stack-backtrace addresses into a stack_trace buffer. | |
| 27 | */ | |
| 4e14dfc7 MF |
28 | static void save_stack_address(void *data, unsigned long addr, int reliable) |
| 29 | { | |
| 30 | struct stack_trace *trace = data; | |
| 31 | ||
| 48e4d460 PM |
32 | if (!reliable) |
| 33 | return; | |
| 34 | ||
| 4e14dfc7 MF |
35 | if (trace->skip > 0) { |
| 36 | trace->skip--; | |
| 37 | return; | |
| 38 | } | |
| 39 | ||
| 40 | if (trace->nr_entries < trace->max_entries) | |
| 41 | trace->entries[trace->nr_entries++] = addr; | |
| 42 | } | |
| 43 | ||
| 44 | static const struct stacktrace_ops save_stack_ops = { | |
| 4e14dfc7 MF |
45 | .stack = save_stack_stack, |
| 46 | .address = save_stack_address, | |
| 47 | }; | |
| 48 | ||
| a3cf4ea8 | 49 | void save_stack_trace(struct stack_trace *trace) |
| afbfb52e | 50 | { |
| ab1b6f03 | 51 | unsigned long *sp = (unsigned long *)current_stack_pointer; |
| afbfb52e | 52 | |
| 0eff9f66 | 53 | unwind_stack(current, NULL, sp, &save_stack_ops, trace); |
| 606b4c99 PM |
54 | if (trace->nr_entries < trace->max_entries) |
| 55 | trace->entries[trace->nr_entries++] = ULONG_MAX; | |
| afbfb52e | 56 | } |
| 7b4c9505 | 57 | EXPORT_SYMBOL_GPL(save_stack_trace); |
| 5a89f1ad | 58 | |
| 4e14dfc7 MF |
59 | static void |
| 60 | save_stack_address_nosched(void *data, unsigned long addr, int reliable) | |
| 61 | { | |
| 62 | struct stack_trace *trace = (struct stack_trace *)data; | |
| 63 | ||
| 48e4d460 PM |
64 | if (!reliable) |
| 65 | return; | |
| 66 | ||
| 4e14dfc7 MF |
67 | if (in_sched_functions(addr)) |
| 68 | return; | |
| 69 | ||
| 70 | if (trace->skip > 0) { | |
| 71 | trace->skip--; | |
| 72 | return; | |
| 73 | } | |
| 74 | ||
| 75 | if (trace->nr_entries < trace->max_entries) | |
| 76 | trace->entries[trace->nr_entries++] = addr; | |
| 77 | } | |
| 78 | ||
| 79 | static const struct stacktrace_ops save_stack_ops_nosched = { | |
| 4e14dfc7 MF |
80 | .stack = save_stack_stack, |
| 81 | .address = save_stack_address_nosched, | |
| 82 | }; | |
| 83 | ||
| 5a89f1ad PM |
84 | void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace) |
| 85 | { | |
| 86 | unsigned long *sp = (unsigned long *)tsk->thread.sp; | |
| 87 | ||
| 0eff9f66 | 88 | unwind_stack(current, NULL, sp, &save_stack_ops_nosched, trace); |
| 606b4c99 PM |
89 | if (trace->nr_entries < trace->max_entries) |
| 90 | trace->entries[trace->nr_entries++] = ULONG_MAX; | |
| 5a89f1ad PM |
91 | } |
| 92 | EXPORT_SYMBOL_GPL(save_stack_trace_tsk); |