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1/*
2 * Copyright (C) 1991, 1992 Linus Torvalds
3 * Copyright (C) 2000, 2001, 2002 Andi Kleen, SuSE Labs
4 * Copyright (C) 2009 Matt Fleming
5 * Copyright (C) 2002 - 2012 Paul Mundt
6 *
7 * This file is subject to the terms and conditions of the GNU General Public
8 * License. See the file "COPYING" in the main directory of this archive
9 * for more details.
10 */
11#include <linux/kallsyms.h>
12#include <linux/ftrace.h>
13#include <linux/debug_locks.h>
14#include <linux/kdebug.h>
15#include <linux/export.h>
16#include <linux/uaccess.h>
17#include <asm/unwinder.h>
18#include <asm/stacktrace.h>
19
20void dump_mem(const char *str, unsigned long bottom, unsigned long top)
21{
22 unsigned long p;
23 int i;
24
25 printk("%s(0x%08lx to 0x%08lx)\n", str, bottom, top);
26
27 for (p = bottom & ~31; p < top; ) {
28 printk("%04lx: ", p & 0xffff);
29
30 for (i = 0; i < 8; i++, p += 4) {
31 unsigned int val;
32
33 if (p < bottom || p >= top)
34 printk(" ");
35 else {
36 if (__get_user(val, (unsigned int __user *)p)) {
37 printk("\n");
38 return;
39 }
40 printk("%08x ", val);
41 }
42 }
43 printk("\n");
44 }
45}
46
47void printk_address(unsigned long address, int reliable)
48{
49 printk(" [<%p>] %s%pS\n", (void *) address,
50 reliable ? "" : "? ", (void *) address);
51}
52
53#ifdef CONFIG_FUNCTION_GRAPH_TRACER
54static void
55print_ftrace_graph_addr(unsigned long addr, void *data,
56 const struct stacktrace_ops *ops,
57 struct thread_info *tinfo, int *graph)
58{
59 struct task_struct *task = tinfo->task;
60 unsigned long ret_addr;
61 int index = task->curr_ret_stack;
62
63 if (addr != (unsigned long)return_to_handler)
64 return;
65
66 if (!task->ret_stack || index < *graph)
67 return;
68
69 index -= *graph;
70 ret_addr = task->ret_stack[index].ret;
71
72 ops->address(data, ret_addr, 1);
73
74 (*graph)++;
75}
76#else
77static inline void
78print_ftrace_graph_addr(unsigned long addr, void *data,
79 const struct stacktrace_ops *ops,
80 struct thread_info *tinfo, int *graph)
81{ }
82#endif
83
84void
85stack_reader_dump(struct task_struct *task, struct pt_regs *regs,
86 unsigned long *sp, const struct stacktrace_ops *ops,
87 void *data)
88{
89 struct thread_info *context;
90 int graph = 0;
91
92 context = (struct thread_info *)
93 ((unsigned long)sp & (~(THREAD_SIZE - 1)));
94
95 while (!kstack_end(sp)) {
96 unsigned long addr = *sp++;
97
98 if (__kernel_text_address(addr)) {
99 ops->address(data, addr, 1);
100
101 print_ftrace_graph_addr(addr, data, ops,
102 context, &graph);
103 }
104 }
105}
106
107static int print_trace_stack(void *data, char *name)
108{
109 printk("%s <%s> ", (char *)data, name);
110 return 0;
111}
112
113/*
114 * Print one address/symbol entries per line.
115 */
116static void print_trace_address(void *data, unsigned long addr, int reliable)
117{
118 printk("%s", (char *)data);
119 printk_address(addr, reliable);
120}
121
122static const struct stacktrace_ops print_trace_ops = {
123 .stack = print_trace_stack,
124 .address = print_trace_address,
125};
126
127void show_trace(struct task_struct *tsk, unsigned long *sp,
128 struct pt_regs *regs)
129{
130 if (regs && user_mode(regs))
131 return;
132
133 printk("\nCall trace:\n");
134
135 unwind_stack(tsk, regs, sp, &print_trace_ops, "");
136
137 printk("\n");
138
139 if (!tsk)
140 tsk = current;
141
142 debug_show_held_locks(tsk);
143}
144
145void show_stack(struct task_struct *tsk, unsigned long *sp)
146{
147 unsigned long stack;
148
149 if (!tsk)
150 tsk = current;
151 if (tsk == current)
152 sp = (unsigned long *)current_stack_pointer;
153 else
154 sp = (unsigned long *)tsk->thread.sp;
155
156 stack = (unsigned long)sp;
157 dump_mem("Stack: ", stack, THREAD_SIZE +
158 (unsigned long)task_stack_page(tsk));
159 show_trace(tsk, sp, NULL);
160}
1/*
2 * Copyright (C) 1991, 1992 Linus Torvalds
3 * Copyright (C) 2000, 2001, 2002 Andi Kleen, SuSE Labs
4 * Copyright (C) 2009 Matt Fleming
5 */
6#include <linux/kallsyms.h>
7#include <linux/ftrace.h>
8#include <linux/debug_locks.h>
9#include <asm/unwinder.h>
10#include <asm/stacktrace.h>
11
12void printk_address(unsigned long address, int reliable)
13{
14 printk(" [<%p>] %s%pS\n", (void *) address,
15 reliable ? "" : "? ", (void *) address);
16}
17
18#ifdef CONFIG_FUNCTION_GRAPH_TRACER
19static void
20print_ftrace_graph_addr(unsigned long addr, void *data,
21 const struct stacktrace_ops *ops,
22 struct thread_info *tinfo, int *graph)
23{
24 struct task_struct *task = tinfo->task;
25 unsigned long ret_addr;
26 int index = task->curr_ret_stack;
27
28 if (addr != (unsigned long)return_to_handler)
29 return;
30
31 if (!task->ret_stack || index < *graph)
32 return;
33
34 index -= *graph;
35 ret_addr = task->ret_stack[index].ret;
36
37 ops->address(data, ret_addr, 1);
38
39 (*graph)++;
40}
41#else
42static inline void
43print_ftrace_graph_addr(unsigned long addr, void *data,
44 const struct stacktrace_ops *ops,
45 struct thread_info *tinfo, int *graph)
46{ }
47#endif
48
49void
50stack_reader_dump(struct task_struct *task, struct pt_regs *regs,
51 unsigned long *sp, const struct stacktrace_ops *ops,
52 void *data)
53{
54 struct thread_info *context;
55 int graph = 0;
56
57 context = (struct thread_info *)
58 ((unsigned long)sp & (~(THREAD_SIZE - 1)));
59
60 while (!kstack_end(sp)) {
61 unsigned long addr = *sp++;
62
63 if (__kernel_text_address(addr)) {
64 ops->address(data, addr, 1);
65
66 print_ftrace_graph_addr(addr, data, ops,
67 context, &graph);
68 }
69 }
70}
71
72static int print_trace_stack(void *data, char *name)
73{
74 printk("%s <%s> ", (char *)data, name);
75 return 0;
76}
77
78/*
79 * Print one address/symbol entries per line.
80 */
81static void print_trace_address(void *data, unsigned long addr, int reliable)
82{
83 printk(data);
84 printk_address(addr, reliable);
85}
86
87static const struct stacktrace_ops print_trace_ops = {
88 .stack = print_trace_stack,
89 .address = print_trace_address,
90};
91
92void show_trace(struct task_struct *tsk, unsigned long *sp,
93 struct pt_regs *regs)
94{
95 if (regs && user_mode(regs))
96 return;
97
98 printk("\nCall trace:\n");
99
100 unwind_stack(tsk, regs, sp, &print_trace_ops, "");
101
102 printk("\n");
103
104 if (!tsk)
105 tsk = current;
106
107 debug_show_held_locks(tsk);
108}