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 | |
9c0729dc SSP |
20 | void dump_trace(struct task_struct *task, |
21 | struct pt_regs *regs, unsigned long *stack, | |
2bc5f927 AH |
22 | const struct stacktrace_ops *ops, void *data) |
23 | { | |
7ee991fb | 24 | int graph = 0; |
9c0729dc | 25 | unsigned long bp; |
7ee991fb | 26 | |
2bc5f927 AH |
27 | if (!task) |
28 | task = current; | |
29 | ||
30 | if (!stack) { | |
31 | unsigned long dummy; | |
b8030906 | 32 | |
2bc5f927 | 33 | stack = &dummy; |
8a541665 | 34 | if (task && task != current) |
2bc5f927 AH |
35 | stack = (unsigned long *)task->thread.sp; |
36 | } | |
37 | ||
9c0729dc | 38 | bp = stack_frame(task, regs); |
2bc5f927 AH |
39 | for (;;) { |
40 | struct thread_info *context; | |
41 | ||
42 | context = (struct thread_info *) | |
43 | ((unsigned long)stack & (~(THREAD_SIZE - 1))); | |
61c1917f | 44 | bp = ops->walk_stack(context, stack, bp, ops, data, NULL, &graph); |
2ac53721 | 45 | |
2bc5f927 AH |
46 | stack = (unsigned long *)context->previous_esp; |
47 | if (!stack) | |
48 | break; | |
2ac53721 AH |
49 | if (ops->stack(data, "IRQ") < 0) |
50 | break; | |
2bc5f927 AH |
51 | touch_nmi_watchdog(); |
52 | } | |
53 | } | |
54 | EXPORT_SYMBOL(dump_trace); | |
55 | ||
878719e8 | 56 | void |
2bc5f927 | 57 | show_stack_log_lvl(struct task_struct *task, struct pt_regs *regs, |
9c0729dc | 58 | unsigned long *sp, char *log_lvl) |
2bc5f927 AH |
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; | |
8a541665 | 74 | if (i && ((i % STACKSLOTS_PER_LINE) == 0)) |
e4072a9a JS |
75 | printk(KERN_CONT "\n"); |
76 | printk(KERN_CONT " %08lx", *stack++); | |
ca0a8164 | 77 | touch_nmi_watchdog(); |
2bc5f927 | 78 | } |
e4072a9a | 79 | printk(KERN_CONT "\n"); |
9c0729dc | 80 | show_trace_log_lvl(task, regs, sp, log_lvl); |
2bc5f927 AH |
81 | } |
82 | ||
2bc5f927 AH |
83 | |
84 | void show_registers(struct pt_regs *regs) | |
85 | { | |
86 | int i; | |
87 | ||
88 | print_modules(); | |
89 | __show_regs(regs, 0); | |
90 | ||
ca0a8164 | 91 | printk(KERN_EMERG "Process %.*s (pid: %d, ti=%p task=%p task.ti=%p)\n", |
2bc5f927 AH |
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 | ||
ca0a8164 | 104 | printk(KERN_EMERG "Stack:\n"); |
9c0729dc | 105 | show_stack_log_lvl(NULL, regs, ®s->sp, KERN_EMERG); |
2bc5f927 AH |
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)) { | |
8a541665 | 111 | /* try starting at IP */ |
2bc5f927 AH |
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 | ||
130 | int 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 | } |