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Alexander van Heukelum2bc5f922008-09-30 13:12:14 +02001/*
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 +02008#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 +010013#include <linux/sysfs.h>
Alexander van Heukelum2bc5f922008-09-30 13:12:14 +020014#include <linux/bug.h>
15#include <linux/nmi.h>
16
17#include <asm/stacktrace.h>
18
Frederic Weisbecker0406ca62009-07-01 21:02:09 +020019
Namhyung Kime8e999cf2011-03-18 11:40:06 +090020void dump_trace(struct task_struct *task, struct pt_regs *regs,
21 unsigned long *stack, unsigned long bp,
Alexander van Heukelum2bc5f922008-09-30 13:12:14 +020022 const struct stacktrace_ops *ops, void *data)
23{
Steven Rostedt7ee991f2008-12-02 23:50:04 -050024 int graph = 0;
25
Alexander van Heukelum2bc5f922008-09-30 13:12:14 +020026 if (!task)
27 task = current;
28
29 if (!stack) {
30 unsigned long dummy;
Ingo Molnarb8030902009-11-26 08:17:31 +010031
Alexander van Heukelum2bc5f922008-09-30 13:12:14 +020032 stack = &dummy;
Alexander van Heukelum8a541662008-10-04 23:12:46 +020033 if (task && task != current)
Alexander van Heukelum2bc5f922008-09-30 13:12:14 +020034 stack = (unsigned long *)task->thread.sp;
35 }
36
Namhyung Kime8e999cf2011-03-18 11:40:06 +090037 if (!bp)
38 bp = stack_frame(task, regs);
39
Alexander van Heukelum2bc5f922008-09-30 13:12:14 +020040 for (;;) {
41 struct thread_info *context;
42
43 context = (struct thread_info *)
44 ((unsigned long)stack & (~(THREAD_SIZE - 1)));
Frederic Weisbecker61c19172009-12-17 05:40:33 +010045 bp = ops->walk_stack(context, stack, bp, ops, data, NULL, &graph);
Alexander van Heukelum2ac53722008-10-04 23:12:43 +020046
Alexander van Heukelum2bc5f922008-09-30 13:12:14 +020047 stack = (unsigned long *)context->previous_esp;
48 if (!stack)
49 break;
Alexander van Heukelum2ac53722008-10-04 23:12:43 +020050 if (ops->stack(data, "IRQ") < 0)
51 break;
Alexander van Heukelum2bc5f922008-09-30 13:12:14 +020052 touch_nmi_watchdog();
53 }
54}
55EXPORT_SYMBOL(dump_trace);
56
Neil Horman878719e2008-10-23 10:40:06 -040057void
Alexander van Heukelum2bc5f922008-09-30 13:12:14 +020058show_stack_log_lvl(struct task_struct *task, struct pt_regs *regs,
Namhyung Kime8e999cf2011-03-18 11:40:06 +090059 unsigned long *sp, unsigned long bp, char *log_lvl)
Alexander van Heukelum2bc5f922008-09-30 13:12:14 +020060{
61 unsigned long *stack;
62 int i;
63
64 if (sp == NULL) {
65 if (task)
66 sp = (unsigned long *)task->thread.sp;
67 else
68 sp = (unsigned long *)&sp;
69 }
70
71 stack = sp;
72 for (i = 0; i < kstack_depth_to_print; i++) {
73 if (kstack_end(stack))
74 break;
Alexander van Heukelum8a541662008-10-04 23:12:46 +020075 if (i && ((i % STACKSLOTS_PER_LINE) == 0))
Jiri Slabye4072a92010-10-20 16:48:51 +020076 printk(KERN_CONT "\n");
77 printk(KERN_CONT " %08lx", *stack++);
Alexander van Heukelumca0a8162008-10-04 23:12:44 +020078 touch_nmi_watchdog();
Alexander van Heukelum2bc5f922008-09-30 13:12:14 +020079 }
Jiri Slabye4072a92010-10-20 16:48:51 +020080 printk(KERN_CONT "\n");
Namhyung Kime8e999cf2011-03-18 11:40:06 +090081 show_trace_log_lvl(task, regs, sp, bp, log_lvl);
Alexander van Heukelum2bc5f922008-09-30 13:12:14 +020082}
83
Alexander van Heukelum2bc5f922008-09-30 13:12:14 +020084
85void show_registers(struct pt_regs *regs)
86{
87 int i;
88
89 print_modules();
90 __show_regs(regs, 0);
91
Alexander van Heukelumca0a8162008-10-04 23:12:44 +020092 printk(KERN_EMERG "Process %.*s (pid: %d, ti=%p task=%p task.ti=%p)\n",
Alexander van Heukelum2bc5f922008-09-30 13:12:14 +020093 TASK_COMM_LEN, current->comm, task_pid_nr(current),
94 current_thread_info(), current, task_thread_info(current));
95 /*
96 * When in-kernel, we also print out the stack and code at the
97 * time of the fault..
98 */
99 if (!user_mode_vm(regs)) {
100 unsigned int code_prologue = code_bytes * 43 / 64;
101 unsigned int code_len = code_bytes;
102 unsigned char c;
103 u8 *ip;
104
Alexander van Heukelumca0a8162008-10-04 23:12:44 +0200105 printk(KERN_EMERG "Stack:\n");
Namhyung Kime8e999cf2011-03-18 11:40:06 +0900106 show_stack_log_lvl(NULL, regs, &regs->sp, 0, KERN_EMERG);
Alexander van Heukelum2bc5f922008-09-30 13:12:14 +0200107
108 printk(KERN_EMERG "Code: ");
109
110 ip = (u8 *)regs->ip - code_prologue;
111 if (ip < (u8 *)PAGE_OFFSET || probe_kernel_address(ip, c)) {
Alexander van Heukelum8a541662008-10-04 23:12:46 +0200112 /* try starting at IP */
Alexander van Heukelum2bc5f922008-09-30 13:12:14 +0200113 ip = (u8 *)regs->ip;
114 code_len = code_len - code_prologue + 1;
115 }
116 for (i = 0; i < code_len; i++, ip++) {
117 if (ip < (u8 *)PAGE_OFFSET ||
118 probe_kernel_address(ip, c)) {
119 printk(" Bad EIP value.");
120 break;
121 }
122 if (ip == (u8 *)regs->ip)
123 printk("<%02x> ", c);
124 else
125 printk("%02x ", c);
126 }
127 }
128 printk("\n");
129}
130
131int is_valid_bugaddr(unsigned long ip)
132{
133 unsigned short ud2;
134
135 if (ip < PAGE_OFFSET)
136 return 0;
137 if (probe_kernel_address((unsigned short *)ip, ud2))
138 return 0;
139
140 return ud2 == 0x0b0f;
141}