Commit | Line | Data |
---|---|---|
4e14dfc7 MF |
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> | |
0eff9f66 | 9 | #include <asm/unwinder.h> |
4e14dfc7 MF |
10 | #include <asm/stacktrace.h> |
11 | ||
12 | void 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 | |
19 | static void | |
20 | print_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 | |
42 | static inline void | |
43 | print_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 | ||
0eff9f66 MF |
49 | void |
50 | stack_reader_dump(struct task_struct *task, struct pt_regs *regs, | |
51 | unsigned long *sp, const struct stacktrace_ops *ops, | |
52 | void *data) | |
4e14dfc7 MF |
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)) { | |
f9967e23 | 64 | ops->address(data, addr, 1); |
4e14dfc7 MF |
65 | |
66 | print_ftrace_graph_addr(addr, data, ops, | |
67 | context, &graph); | |
68 | } | |
69 | } | |
70 | } | |
4e14dfc7 MF |
71 | |
72 | static void | |
73 | print_trace_warning_symbol(void *data, char *msg, unsigned long symbol) | |
74 | { | |
75 | printk(data); | |
76 | print_symbol(msg, symbol); | |
77 | printk("\n"); | |
78 | } | |
79 | ||
80 | static void print_trace_warning(void *data, char *msg) | |
81 | { | |
82 | printk("%s%s\n", (char *)data, msg); | |
83 | } | |
84 | ||
85 | static int print_trace_stack(void *data, char *name) | |
86 | { | |
87 | printk("%s <%s> ", (char *)data, name); | |
88 | return 0; | |
89 | } | |
90 | ||
91 | /* | |
92 | * Print one address/symbol entries per line. | |
93 | */ | |
94 | static void print_trace_address(void *data, unsigned long addr, int reliable) | |
95 | { | |
96 | printk(data); | |
97 | printk_address(addr, reliable); | |
98 | } | |
99 | ||
100 | static const struct stacktrace_ops print_trace_ops = { | |
101 | .warning = print_trace_warning, | |
102 | .warning_symbol = print_trace_warning_symbol, | |
103 | .stack = print_trace_stack, | |
104 | .address = print_trace_address, | |
105 | }; | |
106 | ||
107 | void show_trace(struct task_struct *tsk, unsigned long *sp, | |
108 | struct pt_regs *regs) | |
109 | { | |
110 | if (regs && user_mode(regs)) | |
111 | return; | |
112 | ||
113 | printk("\nCall trace:\n"); | |
114 | ||
0eff9f66 | 115 | unwind_stack(tsk, regs, sp, &print_trace_ops, ""); |
4e14dfc7 MF |
116 | |
117 | printk("\n"); | |
118 | ||
119 | if (!tsk) | |
120 | tsk = current; | |
121 | ||
122 | debug_show_held_locks(tsk); | |
123 | } |