blob: cb910911358407583ae5d2babf847f743f4a0882 [file] [log] [blame]
Ingo Molnar21b32bb2006-07-03 00:24:40 -07001/*
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 Kleenc0b766f2006-09-26 10:52:34 +020010#include <linux/module.h>
11#include <asm/stacktrace.h>
Ingo Molnar21b32bb2006-07-03 00:24:40 -070012
Andi Kleenc0b766f2006-09-26 10:52:34 +020013static void save_stack_warning(void *data, char *msg)
Ingo Molnar21b32bb2006-07-03 00:24:40 -070014{
Ingo Molnar21b32bb2006-07-03 00:24:40 -070015}
16
Andi Kleenc0b766f2006-09-26 10:52:34 +020017static void
18save_stack_warning_symbol(void *data, char *msg, unsigned long symbol)
Ingo Molnar21b32bb2006-07-03 00:24:40 -070019{
Ingo Molnar21b32bb2006-07-03 00:24:40 -070020}
21
Andi Kleenc0b766f2006-09-26 10:52:34 +020022static int save_stack_stack(void *data, char *name)
Ingo Molnar21b32bb2006-07-03 00:24:40 -070023{
Christoph Hellwigab1b6f02007-05-08 00:23:29 -070024 return -1;
Ingo Molnar21b32bb2006-07-03 00:24:40 -070025}
26
Andi Kleenc0b766f2006-09-26 10:52:34 +020027static 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 Marinas006e84e2007-02-13 13:26:21 +010034 if (trace->nr_entries < trace->max_entries)
Andi Kleenc0b766f2006-09-26 10:52:34 +020035 trace->entries[trace->nr_entries++] = addr;
36}
37
38static 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 Molnar21b32bb2006-07-03 00:24:40 -070044
45/*
46 * Save stack-backtrace addresses into a stack_trace buffer.
Ingo Molnar21b32bb2006-07-03 00:24:40 -070047 */
Christoph Hellwigab1b6f02007-05-08 00:23:29 -070048void save_stack_trace(struct stack_trace *trace)
Ingo Molnar21b32bb2006-07-03 00:24:40 -070049{
Christoph Hellwigab1b6f02007-05-08 00:23:29 -070050 dump_trace(current, NULL, NULL, &save_stack_ops, trace);
Catalin Marinas006e84e2007-02-13 13:26:21 +010051 if (trace->nr_entries < trace->max_entries)
52 trace->entries[trace->nr_entries++] = ULONG_MAX;
Ingo Molnar21b32bb2006-07-03 00:24:40 -070053}
Andi Kleenc0b766f2006-09-26 10:52:34 +020054EXPORT_SYMBOL(save_stack_trace);