Loading...
1/*
2 * Stack trace management functions
3 *
4 * Copyright (C) 2006-2009 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
5 */
6#include <linux/sched.h>
7#include <linux/stacktrace.h>
8#include <linux/module.h>
9#include <linux/uaccess.h>
10#include <asm/stacktrace.h>
11
12static int save_stack_stack(void *data, char *name)
13{
14 return 0;
15}
16
17static void
18__save_stack_address(void *data, unsigned long addr, bool reliable, bool nosched)
19{
20 struct stack_trace *trace = data;
21#ifdef CONFIG_FRAME_POINTER
22 if (!reliable)
23 return;
24#endif
25 if (nosched && in_sched_functions(addr))
26 return;
27 if (trace->skip > 0) {
28 trace->skip--;
29 return;
30 }
31 if (trace->nr_entries < trace->max_entries)
32 trace->entries[trace->nr_entries++] = addr;
33}
34
35static void save_stack_address(void *data, unsigned long addr, int reliable)
36{
37 return __save_stack_address(data, addr, reliable, false);
38}
39
40static void
41save_stack_address_nosched(void *data, unsigned long addr, int reliable)
42{
43 return __save_stack_address(data, addr, reliable, true);
44}
45
46static const struct stacktrace_ops save_stack_ops = {
47 .stack = save_stack_stack,
48 .address = save_stack_address,
49 .walk_stack = print_context_stack,
50};
51
52static const struct stacktrace_ops save_stack_ops_nosched = {
53 .stack = save_stack_stack,
54 .address = save_stack_address_nosched,
55 .walk_stack = print_context_stack,
56};
57
58/*
59 * Save stack-backtrace addresses into a stack_trace buffer.
60 */
61void save_stack_trace(struct stack_trace *trace)
62{
63 dump_trace(current, NULL, NULL, 0, &save_stack_ops, trace);
64 if (trace->nr_entries < trace->max_entries)
65 trace->entries[trace->nr_entries++] = ULONG_MAX;
66}
67EXPORT_SYMBOL_GPL(save_stack_trace);
68
69void save_stack_trace_regs(struct pt_regs *regs, struct stack_trace *trace)
70{
71 dump_trace(current, regs, NULL, 0, &save_stack_ops, trace);
72 if (trace->nr_entries < trace->max_entries)
73 trace->entries[trace->nr_entries++] = ULONG_MAX;
74}
75
76void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
77{
78 dump_trace(tsk, NULL, NULL, 0, &save_stack_ops_nosched, trace);
79 if (trace->nr_entries < trace->max_entries)
80 trace->entries[trace->nr_entries++] = ULONG_MAX;
81}
82EXPORT_SYMBOL_GPL(save_stack_trace_tsk);
83
84/* Userspace stacktrace - based on kernel/trace/trace_sysprof.c */
85
86struct stack_frame_user {
87 const void __user *next_fp;
88 unsigned long ret_addr;
89};
90
91static int
92copy_stack_frame(const void __user *fp, struct stack_frame_user *frame)
93{
94 int ret;
95
96 if (!access_ok(VERIFY_READ, fp, sizeof(*frame)))
97 return 0;
98
99 ret = 1;
100 pagefault_disable();
101 if (__copy_from_user_inatomic(frame, fp, sizeof(*frame)))
102 ret = 0;
103 pagefault_enable();
104
105 return ret;
106}
107
108static inline void __save_stack_trace_user(struct stack_trace *trace)
109{
110 const struct pt_regs *regs = task_pt_regs(current);
111 const void __user *fp = (const void __user *)regs->bp;
112
113 if (trace->nr_entries < trace->max_entries)
114 trace->entries[trace->nr_entries++] = regs->ip;
115
116 while (trace->nr_entries < trace->max_entries) {
117 struct stack_frame_user frame;
118
119 frame.next_fp = NULL;
120 frame.ret_addr = 0;
121 if (!copy_stack_frame(fp, &frame))
122 break;
123 if ((unsigned long)fp < regs->sp)
124 break;
125 if (frame.ret_addr) {
126 trace->entries[trace->nr_entries++] =
127 frame.ret_addr;
128 }
129 if (fp == frame.next_fp)
130 break;
131 fp = frame.next_fp;
132 }
133}
134
135void save_stack_trace_user(struct stack_trace *trace)
136{
137 /*
138 * Trace user stack if we are not a kernel thread
139 */
140 if (current->mm) {
141 __save_stack_trace_user(trace);
142 }
143 if (trace->nr_entries < trace->max_entries)
144 trace->entries[trace->nr_entries++] = ULONG_MAX;
145}
146
1/*
2 * Stack trace management functions
3 *
4 * Copyright (C) 2006-2009 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
5 */
6#include <linux/sched.h>
7#include <linux/stacktrace.h>
8#include <linux/module.h>
9#include <linux/uaccess.h>
10#include <asm/stacktrace.h>
11
12static int save_stack_stack(void *data, char *name)
13{
14 return 0;
15}
16
17static int
18__save_stack_address(void *data, unsigned long addr, bool reliable, bool nosched)
19{
20 struct stack_trace *trace = data;
21#ifdef CONFIG_FRAME_POINTER
22 if (!reliable)
23 return 0;
24#endif
25 if (nosched && in_sched_functions(addr))
26 return 0;
27 if (trace->skip > 0) {
28 trace->skip--;
29 return 0;
30 }
31 if (trace->nr_entries < trace->max_entries) {
32 trace->entries[trace->nr_entries++] = addr;
33 return 0;
34 } else {
35 return -1; /* no more room, stop walking the stack */
36 }
37}
38
39static int save_stack_address(void *data, unsigned long addr, int reliable)
40{
41 return __save_stack_address(data, addr, reliable, false);
42}
43
44static int
45save_stack_address_nosched(void *data, unsigned long addr, int reliable)
46{
47 return __save_stack_address(data, addr, reliable, true);
48}
49
50static const struct stacktrace_ops save_stack_ops = {
51 .stack = save_stack_stack,
52 .address = save_stack_address,
53 .walk_stack = print_context_stack,
54};
55
56static const struct stacktrace_ops save_stack_ops_nosched = {
57 .stack = save_stack_stack,
58 .address = save_stack_address_nosched,
59 .walk_stack = print_context_stack,
60};
61
62/*
63 * Save stack-backtrace addresses into a stack_trace buffer.
64 */
65void save_stack_trace(struct stack_trace *trace)
66{
67 dump_trace(current, NULL, NULL, 0, &save_stack_ops, trace);
68 if (trace->nr_entries < trace->max_entries)
69 trace->entries[trace->nr_entries++] = ULONG_MAX;
70}
71EXPORT_SYMBOL_GPL(save_stack_trace);
72
73void save_stack_trace_regs(struct pt_regs *regs, struct stack_trace *trace)
74{
75 dump_trace(current, regs, NULL, 0, &save_stack_ops, trace);
76 if (trace->nr_entries < trace->max_entries)
77 trace->entries[trace->nr_entries++] = ULONG_MAX;
78}
79
80void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
81{
82 dump_trace(tsk, NULL, NULL, 0, &save_stack_ops_nosched, trace);
83 if (trace->nr_entries < trace->max_entries)
84 trace->entries[trace->nr_entries++] = ULONG_MAX;
85}
86EXPORT_SYMBOL_GPL(save_stack_trace_tsk);
87
88/* Userspace stacktrace - based on kernel/trace/trace_sysprof.c */
89
90struct stack_frame_user {
91 const void __user *next_fp;
92 unsigned long ret_addr;
93};
94
95static int
96copy_stack_frame(const void __user *fp, struct stack_frame_user *frame)
97{
98 int ret;
99
100 if (!access_ok(VERIFY_READ, fp, sizeof(*frame)))
101 return 0;
102
103 ret = 1;
104 pagefault_disable();
105 if (__copy_from_user_inatomic(frame, fp, sizeof(*frame)))
106 ret = 0;
107 pagefault_enable();
108
109 return ret;
110}
111
112static inline void __save_stack_trace_user(struct stack_trace *trace)
113{
114 const struct pt_regs *regs = task_pt_regs(current);
115 const void __user *fp = (const void __user *)regs->bp;
116
117 if (trace->nr_entries < trace->max_entries)
118 trace->entries[trace->nr_entries++] = regs->ip;
119
120 while (trace->nr_entries < trace->max_entries) {
121 struct stack_frame_user frame;
122
123 frame.next_fp = NULL;
124 frame.ret_addr = 0;
125 if (!copy_stack_frame(fp, &frame))
126 break;
127 if ((unsigned long)fp < regs->sp)
128 break;
129 if (frame.ret_addr) {
130 trace->entries[trace->nr_entries++] =
131 frame.ret_addr;
132 }
133 if (fp == frame.next_fp)
134 break;
135 fp = frame.next_fp;
136 }
137}
138
139void save_stack_trace_user(struct stack_trace *trace)
140{
141 /*
142 * Trace user stack if we are not a kernel thread
143 */
144 if (current->mm) {
145 __save_stack_trace_user(trace);
146 }
147 if (trace->nr_entries < trace->max_entries)
148 trace->entries[trace->nr_entries++] = ULONG_MAX;
149}
150