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git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blob - arch/x86/kernel/dumpstack_32.c
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
;
38 bp
= stack_frame(task
, regs
);
41 struct thread_info
*context
;
43 context
= (struct thread_info
*)
44 ((unsigned long)stack
& (~(THREAD_SIZE
- 1)));
45 bp
= ops
->walk_stack(context
, stack
, bp
, ops
, data
, NULL
, &graph
);
47 stack
= (unsigned long *)context
->previous_esp
;
50 if (ops
->stack(data
, "IRQ") < 0)
55 EXPORT_SYMBOL(dump_trace
);
58 show_stack_log_lvl(struct task_struct
*task
, struct pt_regs
*regs
,
59 unsigned long *sp
, unsigned long bp
, char *log_lvl
)
66 sp
= (unsigned long *)task
->thread
.sp
;
68 sp
= (unsigned long *)&sp
;
72 for (i
= 0; i
< kstack_depth_to_print
; i
++) {
73 if (kstack_end(stack
))
75 if (i
&& ((i
% STACKSLOTS_PER_LINE
) == 0))
77 pr_cont(" %08lx", *stack
++);
81 show_trace_log_lvl(task
, regs
, sp
, bp
, log_lvl
);
85 void show_regs(struct pt_regs
*regs
)
89 show_regs_print_info(KERN_EMERG
);
90 __show_regs(regs
, !user_mode_vm(regs
));
93 * When in-kernel, we also print out the stack and code at the
96 if (!user_mode_vm(regs
)) {
97 unsigned int code_prologue
= code_bytes
* 43 / 64;
98 unsigned int code_len
= code_bytes
;
102 pr_emerg("Stack:\n");
103 show_stack_log_lvl(NULL
, regs
, ®s
->sp
, 0, KERN_EMERG
);
107 ip
= (u8
*)regs
->ip
- code_prologue
;
108 if (ip
< (u8
*)PAGE_OFFSET
|| probe_kernel_address(ip
, c
)) {
109 /* try starting at IP */
111 code_len
= code_len
- code_prologue
+ 1;
113 for (i
= 0; i
< code_len
; i
++, ip
++) {
114 if (ip
< (u8
*)PAGE_OFFSET
||
115 probe_kernel_address(ip
, c
)) {
116 pr_cont(" Bad EIP value.");
119 if (ip
== (u8
*)regs
->ip
)
120 pr_cont(" <%02x>", c
);
128 int is_valid_bugaddr(unsigned long ip
)
132 if (ip
< PAGE_OFFSET
)
134 if (probe_kernel_address((unsigned short *)ip
, ud2
))
137 return ud2
== 0x0b0f;