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review.evervolv.com / android_kernel_htc_msm8960 / 61a0d49c33c7fd57c14895e5b0760bd02b65ac1f / . / arch / x86 / kernel / dumpstack_32.c
blob: 74cc1eda384b8d26437a10fa55e3f64cfcf4545a [file] [log] [blame]
Alexander van Heukelum2bc5f922008-09-30 13:12:14 +0200[diff] [blame]1/*
2 * Copyright (C) 1991, 1992 Linus Torvalds
3 * Copyright (C) 2000, 2001, 2002 Andi Kleen, SuSE Labs
4 */
5#include <linux/kallsyms.h>
6#include <linux/kprobes.h>
7#include <linux/uaccess.h>
Alexander van Heukelum2bc5f922008-09-30 13:12:14 +0200[diff] [blame]8#include <linux/hardirq.h>
9#include <linux/kdebug.h>
10#include <linux/module.h>
11#include <linux/ptrace.h>
12#include <linux/kexec.h>
Ingo Molnarb8030902009-11-26 08:17:31 +0100[diff] [blame]13#include <linux/sysfs.h>
Alexander van Heukelum2bc5f922008-09-30 13:12:14 +0200[diff] [blame]14#include <linux/bug.h>
15#include <linux/nmi.h>
16
17#include <asm/stacktrace.h>
18
Frederic Weisbecker0406ca62009-07-01 21:02:09 +0200[diff] [blame]19
Soeren Sandmann Pedersen9c0729d2010-11-05 05:59:39 -0400[diff] [blame]20void dump_trace(struct task_struct *task,
21 struct pt_regs *regs, unsigned long *stack,
Alexander van Heukelum2bc5f922008-09-30 13:12:14 +0200[diff] [blame]22 const struct stacktrace_ops *ops, void *data)
23{
Steven Rostedt7ee991f2008-12-02 23:50:04 -0500[diff] [blame]24 int graph = 0;
Soeren Sandmann Pedersen9c0729d2010-11-05 05:59:39 -0400[diff] [blame]25 unsigned long bp;
Steven Rostedt7ee991f2008-12-02 23:50:04 -0500[diff] [blame]26
Alexander van Heukelum2bc5f922008-09-30 13:12:14 +0200[diff] [blame]27 if (!task)
28 task = current;
29
30 if (!stack) {
31 unsigned long dummy;
Ingo Molnarb8030902009-11-26 08:17:31 +0100[diff] [blame]32
Alexander van Heukelum2bc5f922008-09-30 13:12:14 +0200[diff] [blame]33 stack = &dummy;
Alexander van Heukelum8a541662008-10-04 23:12:46 +0200[diff] [blame]34 if (task && task != current)
Alexander van Heukelum2bc5f922008-09-30 13:12:14 +0200[diff] [blame]35 stack = (unsigned long *)task->thread.sp;
36 }
37
Soeren Sandmann Pedersen9c0729d2010-11-05 05:59:39 -0400[diff] [blame]38 bp = stack_frame(task, regs);
Alexander van Heukelum2bc5f922008-09-30 13:12:14 +0200[diff] [blame]39 for (;;) {
40 struct thread_info *context;
41
42 context = (struct thread_info *)
43 ((unsigned long)stack & (~(THREAD_SIZE - 1)));
Frederic Weisbecker61c19172009-12-17 05:40:33 +0100[diff] [blame]44 bp = ops->walk_stack(context, stack, bp, ops, data, NULL, &graph);
Alexander van Heukelum2ac53722008-10-04 23:12:43 +0200[diff] [blame]45
Alexander van Heukelum2bc5f922008-09-30 13:12:14 +0200[diff] [blame]46 stack = (unsigned long *)context->previous_esp;
47 if (!stack)
48 break;
Alexander van Heukelum2ac53722008-10-04 23:12:43 +0200[diff] [blame]49 if (ops->stack(data, "IRQ") < 0)
50 break;
Alexander van Heukelum2bc5f922008-09-30 13:12:14 +0200[diff] [blame]51 touch_nmi_watchdog();
52 }
53}
54EXPORT_SYMBOL(dump_trace);
55
Neil Horman878719e2008-10-23 10:40:06 -0400[diff] [blame]56void
Alexander van Heukelum2bc5f922008-09-30 13:12:14 +0200[diff] [blame]57show_stack_log_lvl(struct task_struct *task, struct pt_regs *regs,
Soeren Sandmann Pedersen9c0729d2010-11-05 05:59:39 -0400[diff] [blame]58 unsigned long *sp, char *log_lvl)
Alexander van Heukelum2bc5f922008-09-30 13:12:14 +0200[diff] [blame]59{
60 unsigned long *stack;
61 int i;
62
63 if (sp == NULL) {
64 if (task)
65 sp = (unsigned long *)task->thread.sp;
66 else
67 sp = (unsigned long *)&sp;
68 }
69
70 stack = sp;
71 for (i = 0; i < kstack_depth_to_print; i++) {
72 if (kstack_end(stack))
73 break;
Alexander van Heukelum8a541662008-10-04 23:12:46 +0200[diff] [blame]74 if (i && ((i % STACKSLOTS_PER_LINE) == 0))
Jiri Slabye4072a92010-10-20 16:48:51 +0200[diff] [blame]75 printk(KERN_CONT "\n");
76 printk(KERN_CONT " %08lx", *stack++);
Alexander van Heukelumca0a8162008-10-04 23:12:44 +0200[diff] [blame]77 touch_nmi_watchdog();
Alexander van Heukelum2bc5f922008-09-30 13:12:14 +0200[diff] [blame]78 }
Jiri Slabye4072a92010-10-20 16:48:51 +0200[diff] [blame]79 printk(KERN_CONT "\n");
Soeren Sandmann Pedersen9c0729d2010-11-05 05:59:39 -0400[diff] [blame]80 show_trace_log_lvl(task, regs, sp, log_lvl);
Alexander van Heukelum2bc5f922008-09-30 13:12:14 +0200[diff] [blame]81}
82
Alexander van Heukelum2bc5f922008-09-30 13:12:14 +0200[diff] [blame]83
84void show_registers(struct pt_regs *regs)
85{
86 int i;
87
88 print_modules();
89 __show_regs(regs, 0);
90
Alexander van Heukelumca0a8162008-10-04 23:12:44 +0200[diff] [blame]91 printk(KERN_EMERG "Process %.*s (pid: %d, ti=%p task=%p task.ti=%p)\n",
Alexander van Heukelum2bc5f922008-09-30 13:12:14 +0200[diff] [blame]92 TASK_COMM_LEN, current->comm, task_pid_nr(current),
93 current_thread_info(), current, task_thread_info(current));
94 /*
95 * When in-kernel, we also print out the stack and code at the
96 * time of the fault..
97 */
98 if (!user_mode_vm(regs)) {
99 unsigned int code_prologue = code_bytes * 43 / 64;
100 unsigned int code_len = code_bytes;
101 unsigned char c;
102 u8 *ip;
103
Alexander van Heukelumca0a8162008-10-04 23:12:44 +0200[diff] [blame]104 printk(KERN_EMERG "Stack:\n");
Soeren Sandmann Pedersen9c0729d2010-11-05 05:59:39 -0400[diff] [blame]105 show_stack_log_lvl(NULL, regs, &regs->sp, KERN_EMERG);
Alexander van Heukelum2bc5f922008-09-30 13:12:14 +0200[diff] [blame]106
107 printk(KERN_EMERG "Code: ");
108
109 ip = (u8 *)regs->ip - code_prologue;
110 if (ip < (u8 *)PAGE_OFFSET || probe_kernel_address(ip, c)) {
Alexander van Heukelum8a541662008-10-04 23:12:46 +0200[diff] [blame]111 /* try starting at IP */
Alexander van Heukelum2bc5f922008-09-30 13:12:14 +0200[diff] [blame]112 ip = (u8 *)regs->ip;
113 code_len = code_len - code_prologue + 1;
114 }
115 for (i = 0; i < code_len; i++, ip++) {
116 if (ip < (u8 *)PAGE_OFFSET ||
117 probe_kernel_address(ip, c)) {
118 printk(" Bad EIP value.");
119 break;
120 }
121 if (ip == (u8 *)regs->ip)
122 printk("<%02x> ", c);
123 else
124 printk("%02x ", c);
125 }
126 }
127 printk("\n");
128}
129
130int is_valid_bugaddr(unsigned long ip)
131{
132 unsigned short ud2;
133
134 if (ip < PAGE_OFFSET)
135 return 0;
136 if (probe_kernel_address((unsigned short *)ip, ud2))
137 return 0;
138
139 return ud2 == 0x0b0f;
140}