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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> | |
8 | #include <linux/utsname.h> | |
9 | #include <linux/hardirq.h> | |
10 | #include <linux/kdebug.h> | |
11 | #include <linux/module.h> | |
12 | #include <linux/ptrace.h> | |
13 | #include <linux/kexec.h> | |
14 | #include <linux/bug.h> | |
15 | #include <linux/nmi.h> | |
ae87221d | 16 | #include <linux/sysfs.h> |
2bc5f927 AH |
17 | |
18 | #include <asm/stacktrace.h> | |
19 | ||
878719e8 | 20 | #include "dumpstack.h" |
2bc5f927 AH |
21 | |
22 | void dump_trace(struct task_struct *task, struct pt_regs *regs, | |
23 | unsigned long *stack, unsigned long bp, | |
24 | const struct stacktrace_ops *ops, void *data) | |
25 | { | |
26 | if (!task) | |
27 | task = current; | |
28 | ||
29 | if (!stack) { | |
30 | unsigned long dummy; | |
31 | stack = &dummy; | |
8a541665 | 32 | if (task && task != current) |
2bc5f927 AH |
33 | stack = (unsigned long *)task->thread.sp; |
34 | } | |
35 | ||
36 | #ifdef CONFIG_FRAME_POINTER | |
37 | if (!bp) { | |
38 | if (task == current) { | |
39 | /* Grab bp right from our regs */ | |
8a541665 | 40 | get_bp(bp); |
2bc5f927 AH |
41 | } else { |
42 | /* bp is the last reg pushed by switch_to */ | |
43 | bp = *(unsigned long *) task->thread.sp; | |
44 | } | |
45 | } | |
46 | #endif | |
47 | ||
48 | for (;;) { | |
49 | struct thread_info *context; | |
50 | ||
51 | context = (struct thread_info *) | |
52 | ((unsigned long)stack & (~(THREAD_SIZE - 1))); | |
3a18512d | 53 | bp = print_context_stack(context, stack, bp, ops, data, NULL); |
2ac53721 | 54 | |
2bc5f927 AH |
55 | stack = (unsigned long *)context->previous_esp; |
56 | if (!stack) | |
57 | break; | |
2ac53721 AH |
58 | if (ops->stack(data, "IRQ") < 0) |
59 | break; | |
2bc5f927 AH |
60 | touch_nmi_watchdog(); |
61 | } | |
62 | } | |
63 | EXPORT_SYMBOL(dump_trace); | |
64 | ||
878719e8 | 65 | void |
2bc5f927 | 66 | show_stack_log_lvl(struct task_struct *task, struct pt_regs *regs, |
8a541665 | 67 | unsigned long *sp, unsigned long bp, char *log_lvl) |
2bc5f927 AH |
68 | { |
69 | unsigned long *stack; | |
70 | int i; | |
71 | ||
72 | if (sp == NULL) { | |
73 | if (task) | |
74 | sp = (unsigned long *)task->thread.sp; | |
75 | else | |
76 | sp = (unsigned long *)&sp; | |
77 | } | |
78 | ||
79 | stack = sp; | |
80 | for (i = 0; i < kstack_depth_to_print; i++) { | |
81 | if (kstack_end(stack)) | |
82 | break; | |
8a541665 | 83 | if (i && ((i % STACKSLOTS_PER_LINE) == 0)) |
ca0a8164 AH |
84 | printk("\n%s", log_lvl); |
85 | printk(" %08lx", *stack++); | |
86 | touch_nmi_watchdog(); | |
2bc5f927 | 87 | } |
ca0a8164 | 88 | printk("\n"); |
2bc5f927 AH |
89 | show_trace_log_lvl(task, regs, sp, bp, log_lvl); |
90 | } | |
91 | ||
2bc5f927 AH |
92 | |
93 | void show_registers(struct pt_regs *regs) | |
94 | { | |
95 | int i; | |
96 | ||
97 | print_modules(); | |
98 | __show_regs(regs, 0); | |
99 | ||
ca0a8164 | 100 | printk(KERN_EMERG "Process %.*s (pid: %d, ti=%p task=%p task.ti=%p)\n", |
2bc5f927 AH |
101 | TASK_COMM_LEN, current->comm, task_pid_nr(current), |
102 | current_thread_info(), current, task_thread_info(current)); | |
103 | /* | |
104 | * When in-kernel, we also print out the stack and code at the | |
105 | * time of the fault.. | |
106 | */ | |
107 | if (!user_mode_vm(regs)) { | |
108 | unsigned int code_prologue = code_bytes * 43 / 64; | |
109 | unsigned int code_len = code_bytes; | |
110 | unsigned char c; | |
111 | u8 *ip; | |
112 | ||
ca0a8164 AH |
113 | printk(KERN_EMERG "Stack:\n"); |
114 | show_stack_log_lvl(NULL, regs, ®s->sp, | |
115 | 0, KERN_EMERG); | |
2bc5f927 AH |
116 | |
117 | printk(KERN_EMERG "Code: "); | |
118 | ||
119 | ip = (u8 *)regs->ip - code_prologue; | |
120 | if (ip < (u8 *)PAGE_OFFSET || probe_kernel_address(ip, c)) { | |
8a541665 | 121 | /* try starting at IP */ |
2bc5f927 AH |
122 | ip = (u8 *)regs->ip; |
123 | code_len = code_len - code_prologue + 1; | |
124 | } | |
125 | for (i = 0; i < code_len; i++, ip++) { | |
126 | if (ip < (u8 *)PAGE_OFFSET || | |
127 | probe_kernel_address(ip, c)) { | |
128 | printk(" Bad EIP value."); | |
129 | break; | |
130 | } | |
131 | if (ip == (u8 *)regs->ip) | |
132 | printk("<%02x> ", c); | |
133 | else | |
134 | printk("%02x ", c); | |
135 | } | |
136 | } | |
137 | printk("\n"); | |
138 | } | |
139 | ||
140 | int is_valid_bugaddr(unsigned long ip) | |
141 | { | |
142 | unsigned short ud2; | |
143 | ||
144 | if (ip < PAGE_OFFSET) | |
145 | return 0; | |
146 | if (probe_kernel_address((unsigned short *)ip, ud2)) | |
147 | return 0; | |
148 | ||
149 | return ud2 == 0x0b0f; | |
150 | } | |
151 |