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>
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)
33 if (task && task != current)
34 stack = (unsigned long *)task->thread.sp;
37 #ifdef CONFIG_FRAME_POINTER
39 if (task == current) {
40 /* Grab bp right from our regs */
43 /* bp is the last reg pushed by switch_to */
44 bp = *(unsigned long *) task->thread.sp;
50 struct thread_info *context;
52 context = (struct thread_info *)
53 ((unsigned long)stack & (~(THREAD_SIZE - 1)));
54 bp = ops->walk_stack(context, stack, bp, ops, data, NULL, &graph);
56 stack = (unsigned long *)context->previous_esp;
59 if (ops->stack(data, "IRQ") < 0)
64 EXPORT_SYMBOL(dump_trace);
67 show_stack_log_lvl(struct task_struct *task, struct pt_regs *regs,
68 unsigned long *sp, unsigned long bp, char *log_lvl)
75 sp = (unsigned long *)task->thread.sp;
77 sp = (unsigned long *)&sp;
81 for (i = 0; i < kstack_depth_to_print; i++) {
82 if (kstack_end(stack))
84 if (i && ((i % STACKSLOTS_PER_LINE) == 0))
85 printk("\n%s", log_lvl);
86 printk(" %08lx", *stack++);
90 show_trace_log_lvl(task, regs, sp, bp, log_lvl);
94 void show_registers(struct pt_regs *regs)
101 printk(KERN_EMERG "Process %.*s (pid: %d, ti=%p task=%p task.ti=%p)\n",
102 TASK_COMM_LEN, current->comm, task_pid_nr(current),
103 current_thread_info(), current, task_thread_info(current));
105 * When in-kernel, we also print out the stack and code at the
106 * time of the fault..
108 if (!user_mode_vm(regs)) {
109 unsigned int code_prologue = code_bytes * 43 / 64;
110 unsigned int code_len = code_bytes;
114 printk(KERN_EMERG "Stack:\n");
115 show_stack_log_lvl(NULL, regs, ®s->sp,
118 printk(KERN_EMERG "Code: ");
120 ip = (u8 *)regs->ip - code_prologue;
121 if (ip < (u8 *)PAGE_OFFSET || probe_kernel_address(ip, c)) {
122 /* try starting at IP */
124 code_len = code_len - code_prologue + 1;
126 for (i = 0; i < code_len; i++, ip++) {
127 if (ip < (u8 *)PAGE_OFFSET ||
128 probe_kernel_address(ip, c)) {
129 printk(" Bad EIP value.");
132 if (ip == (u8 *)regs->ip)
133 printk("<%02x> ", c);
141 int is_valid_bugaddr(unsigned long ip)
145 if (ip < PAGE_OFFSET)
147 if (probe_kernel_address((unsigned short *)ip, ud2))
150 return ud2 == 0x0b0f;