projects / linux-block.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 | ||
| 20 | static void save_stack_warning(void *data, char *msg) | |
| 21 | { | |
| 22 | } | |
| 23 | ||
| 24 | static void | |
| 25 | save_stack_warning_symbol(void *data, char *msg, unsigned long symbol) | |
| 26 | { | |
| 27 | } | |
| 28 | ||
| 29 | static int save_stack_stack(void *data, char *name) | |
| 30 | { | |
| 31 | return 0; | |
| 32 | } | |
| afbfb52e PM |
33 | |
| 34 | /* | |
| 35 | * Save stack-backtrace addresses into a stack_trace buffer. | |
| 36 | */ | |
| 4e14dfc7 MF |
37 | static void save_stack_address(void *data, unsigned long addr, int reliable) |
| 38 | { | |
| 39 | struct stack_trace *trace = data; | |
| 40 | ||
| 48e4d460 PM |
41 | if (!reliable) |
| 42 | return; | |
| 43 | ||
| 4e14dfc7 MF |
44 | if (trace->skip > 0) { |
| 45 | trace->skip--; | |
| 46 | return; | |
| 47 | } | |
| 48 | ||
| 49 | if (trace->nr_entries < trace->max_entries) | |
| 50 | trace->entries[trace->nr_entries++] = addr; | |
| 51 | } | |
| 52 | ||
| 53 | static const struct stacktrace_ops save_stack_ops = { | |
| 54 | .warning = save_stack_warning, | |
| 55 | .warning_symbol = save_stack_warning_symbol, | |
| 56 | .stack = save_stack_stack, | |
| 57 | .address = save_stack_address, | |
| 58 | }; | |
| 59 | ||
| a3cf4ea8 | 60 | void save_stack_trace(struct stack_trace *trace) |
| afbfb52e | 61 | { |
| ab1b6f03 | 62 | unsigned long *sp = (unsigned long *)current_stack_pointer; |
| afbfb52e | 63 | |
| 0eff9f66 | 64 | unwind_stack(current, NULL, sp, &save_stack_ops, trace); |
| 606b4c99 PM |
65 | if (trace->nr_entries < trace->max_entries) |
| 66 | trace->entries[trace->nr_entries++] = ULONG_MAX; | |
| afbfb52e | 67 | } |
| 7b4c9505 | 68 | EXPORT_SYMBOL_GPL(save_stack_trace); |
| 5a89f1ad | 69 | |
| 4e14dfc7 MF |
70 | static void |
| 71 | save_stack_address_nosched(void *data, unsigned long addr, int reliable) | |
| 72 | { | |
| 73 | struct stack_trace *trace = (struct stack_trace *)data; | |
| 74 | ||
| 48e4d460 PM |
75 | if (!reliable) |
| 76 | return; | |
| 77 | ||
| 4e14dfc7 MF |
78 | if (in_sched_functions(addr)) |
| 79 | return; | |
| 80 | ||
| 81 | if (trace->skip > 0) { | |
| 82 | trace->skip--; | |
| 83 | return; | |
| 84 | } | |
| 85 | ||
| 86 | if (trace->nr_entries < trace->max_entries) | |
| 87 | trace->entries[trace->nr_entries++] = addr; | |
| 88 | } | |
| 89 | ||
| 90 | static const struct stacktrace_ops save_stack_ops_nosched = { | |
| 91 | .warning = save_stack_warning, | |
| 92 | .warning_symbol = save_stack_warning_symbol, | |
| 93 | .stack = save_stack_stack, | |
| 94 | .address = save_stack_address_nosched, | |
| 95 | }; | |
| 96 | ||
| 5a89f1ad PM |
97 | void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace) |
| 98 | { | |
| 99 | unsigned long *sp = (unsigned long *)tsk->thread.sp; | |
| 100 | ||
| 0eff9f66 | 101 | unwind_stack(current, NULL, sp, &save_stack_ops_nosched, trace); |
| 606b4c99 PM |
102 | if (trace->nr_entries < trace->max_entries) |
| 103 | trace->entries[trace->nr_entries++] = ULONG_MAX; | |
| 5a89f1ad PM |
104 | } |
| 105 | EXPORT_SYMBOL_GPL(save_stack_trace_tsk); |