2 * Copyright (C) 1991, 1992 Linus Torvalds
3 * Copyright (C) 2000, 2001, 2002 Andi Kleen, SuSE Labs
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>
17 #include <asm/stacktrace.h>
19 #include "dumpstack.h"
21 /* Just a stub for now */
22 int x86_is_stack_id(int id, char *name)
27 void dump_trace(struct task_struct *task, struct pt_regs *regs,
28 unsigned long *stack, unsigned long bp,
29 const struct stacktrace_ops *ops, void *data)
40 if (task && task != current)
41 stack = (unsigned long *)task->thread.sp;
44 #ifdef CONFIG_FRAME_POINTER
46 if (task == current) {
47 /* Grab bp right from our regs */
50 /* bp is the last reg pushed by switch_to */
51 bp = *(unsigned long *) task->thread.sp;
57 struct thread_info *context;
59 context = (struct thread_info *)
60 ((unsigned long)stack & (~(THREAD_SIZE - 1)));
61 bp = ops->walk_stack(context, stack, bp, ops, data, NULL, &graph);
63 stack = (unsigned long *)context->previous_esp;
66 if (ops->stack(data, "IRQ") < 0)
71 EXPORT_SYMBOL(dump_trace);
74 show_stack_log_lvl(struct task_struct *task, struct pt_regs *regs,
75 unsigned long *sp, unsigned long bp, char *log_lvl)
82 sp = (unsigned long *)task->thread.sp;
84 sp = (unsigned long *)&sp;
88 for (i = 0; i < kstack_depth_to_print; i++) {
89 if (kstack_end(stack))
91 if (i && ((i % STACKSLOTS_PER_LINE) == 0))
92 printk("\n%s", log_lvl);
93 printk(" %08lx", *stack++);
97 show_trace_log_lvl(task, regs, sp, bp, log_lvl);
101 void show_registers(struct pt_regs *regs)
106 __show_regs(regs, 0);
108 printk(KERN_EMERG "Process %.*s (pid: %d, ti=%p task=%p task.ti=%p)\n",
109 TASK_COMM_LEN, current->comm, task_pid_nr(current),
110 current_thread_info(), current, task_thread_info(current));
112 * When in-kernel, we also print out the stack and code at the
113 * time of the fault..
115 if (!user_mode_vm(regs)) {
116 unsigned int code_prologue = code_bytes * 43 / 64;
117 unsigned int code_len = code_bytes;
121 printk(KERN_EMERG "Stack:\n");
122 show_stack_log_lvl(NULL, regs, ®s->sp,
125 printk(KERN_EMERG "Code: ");
127 ip = (u8 *)regs->ip - code_prologue;
128 if (ip < (u8 *)PAGE_OFFSET || probe_kernel_address(ip, c)) {
129 /* try starting at IP */
131 code_len = code_len - code_prologue + 1;
133 for (i = 0; i < code_len; i++, ip++) {
134 if (ip < (u8 *)PAGE_OFFSET ||
135 probe_kernel_address(ip, c)) {
136 printk(" Bad EIP value.");
139 if (ip == (u8 *)regs->ip)
140 printk("<%02x> ", c);
148 int is_valid_bugaddr(unsigned long ip)
152 if (ip < PAGE_OFFSET)
154 if (probe_kernel_address((unsigned short *)ip, ud2))
157 return ud2 == 0x0b0f;