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 static void *is_irq_stack(void *p
, void *irq
)
21 if (p
< irq
|| p
>= (irq
+ THREAD_SIZE
))
23 return irq
+ THREAD_SIZE
;
27 static void *is_hardirq_stack(unsigned long *stack
, int cpu
)
29 void *irq
= per_cpu(hardirq_stack
, cpu
);
31 return is_irq_stack(stack
, irq
);
34 static void *is_softirq_stack(unsigned long *stack
, int cpu
)
36 void *irq
= per_cpu(softirq_stack
, cpu
);
38 return is_irq_stack(stack
, irq
);
41 void dump_trace(struct task_struct
*task
, struct pt_regs
*regs
,
42 unsigned long *stack
, unsigned long bp
,
43 const struct stacktrace_ops
*ops
, void *data
)
45 const unsigned cpu
= get_cpu();
57 stack
= (unsigned long *)task
->thread
.sp
;
61 bp
= stack_frame(task
, regs
);
66 end_stack
= is_hardirq_stack(stack
, cpu
);
68 end_stack
= is_softirq_stack(stack
, cpu
);
70 bp
= ops
->walk_stack(task
, stack
, bp
, ops
, data
,
73 /* Stop if not on irq stack */
77 /* The previous esp is saved on the bottom of the stack */
78 prev_esp
= (u32
*)(end_stack
- THREAD_SIZE
);
79 stack
= (unsigned long *)*prev_esp
;
83 if (ops
->stack(data
, "IRQ") < 0)
89 EXPORT_SYMBOL(dump_trace
);
92 show_stack_log_lvl(struct task_struct
*task
, struct pt_regs
*regs
,
93 unsigned long *sp
, unsigned long bp
, char *log_lvl
)
100 sp
= (unsigned long *)task
->thread
.sp
;
102 sp
= (unsigned long *)&sp
;
106 for (i
= 0; i
< kstack_depth_to_print
; i
++) {
107 if (kstack_end(stack
))
109 if ((i
% STACKSLOTS_PER_LINE
) == 0) {
112 printk("%s %08lx", log_lvl
, *stack
++);
114 pr_cont(" %08lx", *stack
++);
115 touch_nmi_watchdog();
118 show_trace_log_lvl(task
, regs
, sp
, bp
, log_lvl
);
122 void show_regs(struct pt_regs
*regs
)
126 show_regs_print_info(KERN_EMERG
);
127 __show_regs(regs
, !user_mode(regs
));
130 * When in-kernel, we also print out the stack and code at the
131 * time of the fault..
133 if (!user_mode(regs
)) {
134 unsigned int code_prologue
= code_bytes
* 43 / 64;
135 unsigned int code_len
= code_bytes
;
139 pr_emerg("Stack:\n");
140 show_stack_log_lvl(NULL
, regs
, ®s
->sp
, 0, KERN_EMERG
);
144 ip
= (u8
*)regs
->ip
- code_prologue
;
145 if (ip
< (u8
*)PAGE_OFFSET
|| probe_kernel_address(ip
, c
)) {
146 /* try starting at IP */
148 code_len
= code_len
- code_prologue
+ 1;
150 for (i
= 0; i
< code_len
; i
++, ip
++) {
151 if (ip
< (u8
*)PAGE_OFFSET
||
152 probe_kernel_address(ip
, c
)) {
153 pr_cont(" Bad EIP value.");
156 if (ip
== (u8
*)regs
->ip
)
157 pr_cont(" <%02x>", c
);
165 int is_valid_bugaddr(unsigned long ip
)
169 if (ip
< PAGE_OFFSET
)
171 if (probe_kernel_address((unsigned short *)ip
, ud2
))
174 return ud2
== 0x0b0f;
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