FreeBSD/Linux Kernel Cross Reference
sys/kern/subr_stack.c
1 /*-
2 * Copyright (c) 2005 Antoine Brodin
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27 #include "opt_ddb.h"
28
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
31
32 #include <sys/param.h>
33 #include <sys/kernel.h>
34 #ifdef KTR
35 #include <sys/ktr.h>
36 #endif
37 #include <sys/linker.h>
38 #include <sys/malloc.h>
39 #include <sys/sbuf.h>
40 #include <sys/stack.h>
41 #include <sys/systm.h>
42
43 static MALLOC_DEFINE(M_STACK, "stack", "Stack Traces");
44
45 static void stack_symbol(vm_offset_t pc, char *namebuf, u_int buflen,
46 long *offset);
47 #ifdef DDB
48 static void stack_symbol_ddb(vm_offset_t pc, const char **name, long *offset);
49 #endif
50
51 struct stack *
52 stack_create(void)
53 {
54 struct stack *st;
55
56 st = malloc(sizeof *st, M_STACK, M_WAITOK | M_ZERO);
57 return (st);
58 }
59
60 void
61 stack_destroy(struct stack *st)
62 {
63
64 free(st, M_STACK);
65 }
66
67 int
68 stack_put(struct stack *st, vm_offset_t pc)
69 {
70
71 if (st->depth < STACK_MAX) {
72 st->pcs[st->depth++] = pc;
73 return (0);
74 } else
75 return (-1);
76 }
77
78 void
79 stack_copy(struct stack *src, struct stack *dst)
80 {
81
82 *dst = *src;
83 }
84
85 void
86 stack_zero(struct stack *st)
87 {
88
89 bzero(st, sizeof *st);
90 }
91
92 void
93 stack_print(struct stack *st)
94 {
95 char namebuf[64];
96 long offset;
97 int i;
98
99 KASSERT(st->depth <= STACK_MAX, ("bogus stack"));
100 for (i = 0; i < st->depth; i++) {
101 stack_symbol(st->pcs[i], namebuf, sizeof(namebuf), &offset);
102 printf("#%d %p at %s+%#lx\n", i, (void *)st->pcs[i],
103 namebuf, offset);
104 }
105 }
106
107 #ifdef DDB
108 void
109 stack_print_ddb(struct stack *st)
110 {
111 const char *name;
112 long offset;
113 int i;
114
115 KASSERT(st->depth <= STACK_MAX, ("bogus stack"));
116 for (i = 0; i < st->depth; i++) {
117 stack_symbol_ddb(st->pcs[i], &name, &offset);
118 printf("#%d %p at %s+%#lx\n", i, (void *)st->pcs[i],
119 name, offset);
120 }
121 }
122 #endif
123
124 /*
125 * Two print routines -- one for use from DDB and DDB-like contexts, the
126 * other for use in the live kernel.
127 */
128 void
129 stack_sbuf_print(struct sbuf *sb, struct stack *st)
130 {
131 char namebuf[64];
132 long offset;
133 int i;
134
135 KASSERT(st->depth <= STACK_MAX, ("bogus stack"));
136 for (i = 0; i < st->depth; i++) {
137 stack_symbol(st->pcs[i], namebuf, sizeof(namebuf), &offset);
138 sbuf_printf(sb, "#%d %p at %s+%#lx\n", i, (void *)st->pcs[i],
139 namebuf, offset);
140 }
141 }
142
143 #ifdef DDB
144 void
145 stack_sbuf_print_ddb(struct sbuf *sb, struct stack *st)
146 {
147 const char *name;
148 long offset;
149 int i;
150
151 KASSERT(st->depth <= STACK_MAX, ("bogus stack"));
152 for (i = 0; i < st->depth; i++) {
153 stack_symbol_ddb(st->pcs[i], &name, &offset);
154 sbuf_printf(sb, "#%d %p at %s+%#lx\n", i, (void *)st->pcs[i],
155 name, offset);
156 }
157 }
158
159 #ifdef KTR
160 void
161 stack_ktr(u_int mask, const char *file, int line, struct stack *st, u_int depth,
162 int cheap)
163 {
164 const char *name;
165 long offset;
166 int i;
167
168 KASSERT(st->depth <= STACK_MAX, ("bogus stack"));
169 if (cheap) {
170 ktr_tracepoint(mask, file, line, "#0 %p %p %p %p %p %p",
171 st->pcs[0], st->pcs[1], st->pcs[2], st->pcs[3],
172 st->pcs[4], st->pcs[5]);
173 if (st->depth <= 6)
174 return;
175 ktr_tracepoint(mask, file, line, "#1 %p %p %p %p %p %p",
176 st->pcs[6], st->pcs[7], st->pcs[8], st->pcs[9],
177 st->pcs[10], st->pcs[11]);
178 if (st->depth <= 12)
179 return;
180 ktr_tracepoint(mask, file, line, "#2 %p %p %p %p %p %p",
181 st->pcs[12], st->pcs[13], st->pcs[14], st->pcs[15],
182 st->pcs[16], st->pcs[17]);
183 } else {
184 if (depth == 0 || st->depth < depth)
185 depth = st->depth;
186 for (i = 0; i < depth; i++) {
187 stack_symbol_ddb(st->pcs[i], &name, &offset);
188 ktr_tracepoint(mask, file, line, "#%d %p at %s+%#lx",
189 i, st->pcs[i], (u_long)name, offset, 0, 0);
190 }
191 }
192 }
193 #endif
194 #endif
195
196 /*
197 * Two variants of stack symbol lookup -- one that uses the DDB interfaces
198 * and bypasses linker locking, and the other that doesn't.
199 */
200 static void
201 stack_symbol(vm_offset_t pc, char *namebuf, u_int buflen, long *offset)
202 {
203
204 if (linker_search_symbol_name((caddr_t)pc, namebuf, buflen,
205 offset) != 0) {
206 *offset = 0;
207 strlcpy(namebuf, "??", buflen);
208 }
209 }
210
211 #ifdef DDB
212 static void
213 stack_symbol_ddb(vm_offset_t pc, const char **name, long *offset)
214 {
215 linker_symval_t symval;
216 c_linker_sym_t sym;
217
218 if (linker_ddb_search_symbol((caddr_t)pc, &sym, offset) != 0)
219 goto out;
220 if (linker_ddb_symbol_values(sym, &symval) != 0)
221 goto out;
222 if (symval.name != NULL) {
223 *name = symval.name;
224 return;
225 }
226 out:
227 *offset = 0;
228 *name = "??";
229 }
230 #endif
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