Linux Kernel  3.7.1
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dumpstack_32.c
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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/hardirq.h>
9 #include <linux/kdebug.h>
10 #include <linux/module.h>
11 #include <linux/ptrace.h>
12 #include <linux/kexec.h>
13 #include <linux/sysfs.h>
14 #include <linux/bug.h>
15 #include <linux/nmi.h>
16 
17 #include <asm/stacktrace.h>
18 
19 
20 void dump_trace(struct task_struct *task, struct pt_regs *regs,
21  unsigned long *stack, unsigned long bp,
22  const struct stacktrace_ops *ops, void *data)
23 {
24  int graph = 0;
25 
26  if (!task)
27  task = current;
28 
29  if (!stack) {
30  unsigned long dummy;
31 
32  stack = &dummy;
33  if (task && task != current)
34  stack = (unsigned long *)task->thread.sp;
35  }
36 
37  if (!bp)
38  bp = stack_frame(task, regs);
39 
40  for (;;) {
41  struct thread_info *context;
42 
43  context = (struct thread_info *)
44  ((unsigned long)stack & (~(THREAD_SIZE - 1)));
45  bp = ops->walk_stack(context, stack, bp, ops, data, NULL, &graph);
46 
47  stack = (unsigned long *)context->previous_esp;
48  if (!stack)
49  break;
50  if (ops->stack(data, "IRQ") < 0)
51  break;
53  }
54 }
56 
57 void
59  unsigned long *sp, unsigned long bp, char *log_lvl)
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;
75  if (i && ((i % STACKSLOTS_PER_LINE) == 0))
76  pr_cont("\n");
77  pr_cont(" %08lx", *stack++);
79  }
80  pr_cont("\n");
81  show_trace_log_lvl(task, regs, sp, bp, log_lvl);
82 }
83 
84 
85 void show_regs(struct pt_regs *regs)
86 {
87  int i;
88 
89  __show_regs(regs, !user_mode_vm(regs));
90 
91  pr_emerg("Process %.*s (pid: %d, ti=%p task=%p task.ti=%p)\n",
92  TASK_COMM_LEN, current->comm, task_pid_nr(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 
104  pr_emerg("Stack:\n");
105  show_stack_log_lvl(NULL, regs, &regs->sp, 0, KERN_EMERG);
106 
107  pr_emerg("Code:");
108 
109  ip = (u8 *)regs->ip - code_prologue;
110  if (ip < (u8 *)PAGE_OFFSET || probe_kernel_address(ip, c)) {
111  /* try starting at IP */
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  pr_cont(" Bad EIP value.");
119  break;
120  }
121  if (ip == (u8 *)regs->ip)
122  pr_cont(" <%02x>", c);
123  else
124  pr_cont(" %02x", c);
125  }
126  }
127  pr_cont("\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 }