Ingo Molnar | 21b32bb | 2006-07-03 00:24:40 -0700 | [diff] [blame] | 1 | /* |
| 2 | * arch/x86_64/kernel/stacktrace.c |
| 3 | * |
| 4 | * Stack trace management functions |
| 5 | * |
| 6 | * Copyright (C) 2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com> |
| 7 | */ |
| 8 | #include <linux/sched.h> |
| 9 | #include <linux/stacktrace.h> |
Andi Kleen | c0b766f | 2006-09-26 10:52:34 +0200 | [diff] [blame] | 10 | #include <linux/module.h> |
| 11 | #include <asm/stacktrace.h> |
Ingo Molnar | 21b32bb | 2006-07-03 00:24:40 -0700 | [diff] [blame] | 12 | |
Andi Kleen | c0b766f | 2006-09-26 10:52:34 +0200 | [diff] [blame] | 13 | static void save_stack_warning(void *data, char *msg) |
Ingo Molnar | 21b32bb | 2006-07-03 00:24:40 -0700 | [diff] [blame] | 14 | { |
Ingo Molnar | 21b32bb | 2006-07-03 00:24:40 -0700 | [diff] [blame] | 15 | } |
| 16 | |
Andi Kleen | c0b766f | 2006-09-26 10:52:34 +0200 | [diff] [blame] | 17 | static void |
| 18 | save_stack_warning_symbol(void *data, char *msg, unsigned long symbol) |
Ingo Molnar | 21b32bb | 2006-07-03 00:24:40 -0700 | [diff] [blame] | 19 | { |
Ingo Molnar | 21b32bb | 2006-07-03 00:24:40 -0700 | [diff] [blame] | 20 | } |
| 21 | |
Andi Kleen | c0b766f | 2006-09-26 10:52:34 +0200 | [diff] [blame] | 22 | static int save_stack_stack(void *data, char *name) |
Ingo Molnar | 21b32bb | 2006-07-03 00:24:40 -0700 | [diff] [blame] | 23 | { |
Christoph Hellwig | ab1b6f0 | 2007-05-08 00:23:29 -0700 | [diff] [blame] | 24 | return -1; |
Ingo Molnar | 21b32bb | 2006-07-03 00:24:40 -0700 | [diff] [blame] | 25 | } |
| 26 | |
Andi Kleen | c0b766f | 2006-09-26 10:52:34 +0200 | [diff] [blame] | 27 | static void save_stack_address(void *data, unsigned long addr) |
| 28 | { |
| 29 | struct stack_trace *trace = (struct stack_trace *)data; |
| 30 | if (trace->skip > 0) { |
| 31 | trace->skip--; |
| 32 | return; |
| 33 | } |
Catalin Marinas | 006e84e | 2007-02-13 13:26:21 +0100 | [diff] [blame] | 34 | if (trace->nr_entries < trace->max_entries) |
Andi Kleen | c0b766f | 2006-09-26 10:52:34 +0200 | [diff] [blame] | 35 | trace->entries[trace->nr_entries++] = addr; |
| 36 | } |
| 37 | |
| 38 | static struct stacktrace_ops save_stack_ops = { |
| 39 | .warning = save_stack_warning, |
| 40 | .warning_symbol = save_stack_warning_symbol, |
| 41 | .stack = save_stack_stack, |
| 42 | .address = save_stack_address, |
| 43 | }; |
Ingo Molnar | 21b32bb | 2006-07-03 00:24:40 -0700 | [diff] [blame] | 44 | |
| 45 | /* |
| 46 | * Save stack-backtrace addresses into a stack_trace buffer. |
Ingo Molnar | 21b32bb | 2006-07-03 00:24:40 -0700 | [diff] [blame] | 47 | */ |
Christoph Hellwig | ab1b6f0 | 2007-05-08 00:23:29 -0700 | [diff] [blame] | 48 | void save_stack_trace(struct stack_trace *trace) |
Ingo Molnar | 21b32bb | 2006-07-03 00:24:40 -0700 | [diff] [blame] | 49 | { |
Christoph Hellwig | ab1b6f0 | 2007-05-08 00:23:29 -0700 | [diff] [blame] | 50 | dump_trace(current, NULL, NULL, &save_stack_ops, trace); |
Catalin Marinas | 006e84e | 2007-02-13 13:26:21 +0100 | [diff] [blame] | 51 | if (trace->nr_entries < trace->max_entries) |
| 52 | trace->entries[trace->nr_entries++] = ULONG_MAX; |
Ingo Molnar | 21b32bb | 2006-07-03 00:24:40 -0700 | [diff] [blame] | 53 | } |
Andi Kleen | c0b766f | 2006-09-26 10:52:34 +0200 | [diff] [blame] | 54 | EXPORT_SYMBOL(save_stack_trace); |