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"
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
)
35 if (task
&& task
!= current
)
36 stack
= (unsigned long *)task
->thread
.sp
;
39 #ifdef CONFIG_FRAME_POINTER
41 if (task
== current
) {
42 /* Grab bp right from our regs */
45 /* bp is the last reg pushed by switch_to */
46 bp
= *(unsigned long *) task
->thread
.sp
;
52 struct thread_info
*context
;
54 context
= (struct thread_info
*)
55 ((unsigned long)stack
& (~(THREAD_SIZE
- 1)));
56 bp
= ops
->walk_stack(context
, stack
, bp
, ops
, data
, NULL
, &graph
);
58 stack
= (unsigned long *)context
->previous_esp
;
61 if (ops
->stack(data
, "IRQ") < 0)
66 EXPORT_SYMBOL(dump_trace
);
69 show_stack_log_lvl(struct task_struct
*task
, struct pt_regs
*regs
,
70 unsigned long *sp
, unsigned long bp
, char *log_lvl
)
77 sp
= (unsigned long *)task
->thread
.sp
;
79 sp
= (unsigned long *)&sp
;
83 for (i
= 0; i
< kstack_depth_to_print
; i
++) {
84 if (kstack_end(stack
))
86 if (i
&& ((i
% STACKSLOTS_PER_LINE
) == 0))
87 printk("\n%s", log_lvl
);
88 printk(" %08lx", *stack
++);
92 show_trace_log_lvl(task
, regs
, sp
, bp
, log_lvl
);
96 void show_registers(struct pt_regs
*regs
)
101 __show_regs(regs
, 0);
103 printk(KERN_EMERG
"Process %.*s (pid: %d, ti=%p task=%p task.ti=%p)\n",
104 TASK_COMM_LEN
, current
->comm
, task_pid_nr(current
),
105 current_thread_info(), current
, task_thread_info(current
));
107 * When in-kernel, we also print out the stack and code at the
108 * time of the fault..
110 if (!user_mode_vm(regs
)) {
111 unsigned int code_prologue
= code_bytes
* 43 / 64;
112 unsigned int code_len
= code_bytes
;
116 printk(KERN_EMERG
"Stack:\n");
117 show_stack_log_lvl(NULL
, regs
, ®s
->sp
,
120 printk(KERN_EMERG
"Code: ");
122 ip
= (u8
*)regs
->ip
- code_prologue
;
123 if (ip
< (u8
*)PAGE_OFFSET
|| probe_kernel_address(ip
, c
)) {
124 /* try starting at IP */
126 code_len
= code_len
- code_prologue
+ 1;
128 for (i
= 0; i
< code_len
; i
++, ip
++) {
129 if (ip
< (u8
*)PAGE_OFFSET
||
130 probe_kernel_address(ip
, c
)) {
131 printk(" Bad EIP value.");
134 if (ip
== (u8
*)regs
->ip
)
135 printk("<%02x> ", c
);
143 int is_valid_bugaddr(unsigned long ip
)
147 if (ip
< PAGE_OFFSET
)
149 if (probe_kernel_address((unsigned short *)ip
, ud2
))
152 return ud2
== 0x0b0f;