Commit | Line | Data |
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2bc5f927 AH |
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> | |
2bc5f927 AH |
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> | |
b8030906 | 13 | #include <linux/sysfs.h> |
2bc5f927 AH |
14 | #include <linux/bug.h> |
15 | #include <linux/nmi.h> | |
16 | ||
17 | #include <asm/stacktrace.h> | |
18 | ||
0406ca6d | 19 | |
e8e999cf NK |
20 | void dump_trace(struct task_struct *task, struct pt_regs *regs, |
21 | unsigned long *stack, unsigned long bp, | |
2bc5f927 AH |
22 | const struct stacktrace_ops *ops, void *data) |
23 | { | |
7ee991fb SR |
24 | int graph = 0; |
25 | ||
2bc5f927 AH |
26 | if (!task) |
27 | task = current; | |
28 | ||
29 | if (!stack) { | |
30 | unsigned long dummy; | |
b8030906 | 31 | |
2bc5f927 | 32 | stack = &dummy; |
8a541665 | 33 | if (task && task != current) |
2bc5f927 AH |
34 | stack = (unsigned long *)task->thread.sp; |
35 | } | |
36 | ||
e8e999cf NK |
37 | if (!bp) |
38 | bp = stack_frame(task, regs); | |
39 | ||
2bc5f927 AH |
40 | for (;;) { |
41 | struct thread_info *context; | |
42 | ||
43 | context = (struct thread_info *) | |
44 | ((unsigned long)stack & (~(THREAD_SIZE - 1))); | |
61c1917f | 45 | bp = ops->walk_stack(context, stack, bp, ops, data, NULL, &graph); |
2ac53721 | 46 | |
2bc5f927 AH |
47 | stack = (unsigned long *)context->previous_esp; |
48 | if (!stack) | |
49 | break; | |
2ac53721 AH |
50 | if (ops->stack(data, "IRQ") < 0) |
51 | break; | |
2bc5f927 AH |
52 | touch_nmi_watchdog(); |
53 | } | |
54 | } | |
55 | EXPORT_SYMBOL(dump_trace); | |
56 | ||
878719e8 | 57 | void |
2bc5f927 | 58 | show_stack_log_lvl(struct task_struct *task, struct pt_regs *regs, |
e8e999cf | 59 | unsigned long *sp, unsigned long bp, char *log_lvl) |
2bc5f927 AH |
60 | { |
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; | |
8a541665 | 75 | if (i && ((i % STACKSLOTS_PER_LINE) == 0)) |
e4072a9a JS |
76 | printk(KERN_CONT "\n"); |
77 | printk(KERN_CONT " %08lx", *stack++); | |
ca0a8164 | 78 | touch_nmi_watchdog(); |
2bc5f927 | 79 | } |
e4072a9a | 80 | printk(KERN_CONT "\n"); |
e8e999cf | 81 | show_trace_log_lvl(task, regs, sp, bp, log_lvl); |
2bc5f927 AH |
82 | } |
83 | ||
2bc5f927 AH |
84 | |
85 | void show_registers(struct pt_regs *regs) | |
86 | { | |
87 | int i; | |
88 | ||
89 | print_modules(); | |
90 | __show_regs(regs, 0); | |
91 | ||
ca0a8164 | 92 | printk(KERN_EMERG "Process %.*s (pid: %d, ti=%p task=%p task.ti=%p)\n", |
2bc5f927 AH |
93 | 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 | ||
ca0a8164 | 105 | printk(KERN_EMERG "Stack:\n"); |
e8e999cf | 106 | show_stack_log_lvl(NULL, regs, ®s->sp, 0, KERN_EMERG); |
2bc5f927 AH |
107 | |
108 | printk(KERN_EMERG "Code: "); | |
109 | ||
110 | ip = (u8 *)regs->ip - code_prologue; | |
111 | if (ip < (u8 *)PAGE_OFFSET || probe_kernel_address(ip, c)) { | |
8a541665 | 112 | /* try starting at IP */ |
2bc5f927 AH |
113 | 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 | ||
131 | int 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 | } |