1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22 /*
23 * Copyright 2008 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26
27 #include <unistd.h>
28 #include <dlfcn.h>
29 #include <signal.h>
30 #include <stdarg.h>
31 #include <stdio.h>
32 #include <string.h>
33
34 #include <sys/machelf.h>
35
36 #include <umem_impl.h>
37 #include "misc.h"
38
39 #define UMEM_ERRFD 2 /* goes to standard error */
40 #define UMEM_MAX_ERROR_SIZE 4096 /* error messages are truncated to this */
41
42 /*
43 * This is a circular buffer for holding error messages.
44 * umem_error_enter appends to the buffer, adding "..." to the beginning
45 * if data has been lost.
46 */
47
48 #define ERR_SIZE 8192 /* must be a power of 2 */
49
50 static mutex_t umem_error_lock = DEFAULTMUTEX;
51
52 char umem_error_buffer[ERR_SIZE] = "";
53 uint_t umem_error_begin = 0;
54 uint_t umem_error_end = 0;
55
56 #define WRITE_AND_INC(var, value) { \
57 umem_error_buffer[(var)++] = (value); \
58 var = P2PHASE((var), ERR_SIZE); \
59 }
60
61 static void
log_enter(const char * error_str)62 log_enter(const char *error_str)
63 {
64 int looped;
65 char c;
66
67 looped = 0;
68
69 (void) mutex_lock(&umem_error_lock);
70
71 while ((c = *error_str++) != '\0') {
72 WRITE_AND_INC(umem_error_end, c);
73 if (umem_error_end == umem_error_begin)
74 looped = 1;
75 }
76
77 umem_error_buffer[umem_error_end] = 0;
78
79 if (looped) {
80 uint_t idx;
81 umem_error_begin = P2PHASE(umem_error_end + 1, ERR_SIZE);
82
83 idx = umem_error_begin;
84 WRITE_AND_INC(idx, '.');
85 WRITE_AND_INC(idx, '.');
86 WRITE_AND_INC(idx, '.');
87 }
88
89 (void) mutex_unlock(&umem_error_lock);
90 }
91
92 void
umem_error_enter(const char * error_str)93 umem_error_enter(const char *error_str)
94 {
95 #ifndef UMEM_STANDALONE
96 if (umem_output && !issetugid())
97 (void) write(UMEM_ERRFD, error_str, strlen(error_str));
98 #endif
99
100 log_enter(error_str);
101 }
102
103 int
highbit(ulong_t i)104 highbit(ulong_t i)
105 {
106 register int h = 1;
107
108 if (i == 0)
109 return (0);
110 #ifdef _LP64
111 if (i & 0xffffffff00000000ul) {
112 h += 32; i >>= 32;
113 }
114 #endif
115 if (i & 0xffff0000) {
116 h += 16; i >>= 16;
117 }
118 if (i & 0xff00) {
119 h += 8; i >>= 8;
120 }
121 if (i & 0xf0) {
122 h += 4; i >>= 4;
123 }
124 if (i & 0xc) {
125 h += 2; i >>= 2;
126 }
127 if (i & 0x2) {
128 h += 1;
129 }
130 return (h);
131 }
132
133 int
lowbit(ulong_t i)134 lowbit(ulong_t i)
135 {
136 register int h = 1;
137
138 if (i == 0)
139 return (0);
140 #ifdef _LP64
141 if (!(i & 0xffffffff)) {
142 h += 32; i >>= 32;
143 }
144 #endif
145 if (!(i & 0xffff)) {
146 h += 16; i >>= 16;
147 }
148 if (!(i & 0xff)) {
149 h += 8; i >>= 8;
150 }
151 if (!(i & 0xf)) {
152 h += 4; i >>= 4;
153 }
154 if (!(i & 0x3)) {
155 h += 2; i >>= 2;
156 }
157 if (!(i & 0x1)) {
158 h += 1;
159 }
160 return (h);
161 }
162
163 void
hrt2ts(hrtime_t hrt,timestruc_t * tsp)164 hrt2ts(hrtime_t hrt, timestruc_t *tsp)
165 {
166 tsp->tv_sec = hrt / NANOSEC;
167 tsp->tv_nsec = hrt % NANOSEC;
168 }
169
170 void
log_message(const char * format,...)171 log_message(const char *format, ...)
172 {
173 char buf[UMEM_MAX_ERROR_SIZE] = "";
174
175 va_list va;
176
177 va_start(va, format);
178 (void) vsnprintf(buf, UMEM_MAX_ERROR_SIZE-1, format, va);
179 va_end(va);
180
181 #ifndef UMEM_STANDALONE
182 if (umem_output > 1)
183 (void) write(UMEM_ERRFD, buf, strlen(buf));
184 #endif
185
186 log_enter(buf);
187 }
188
189 #ifndef UMEM_STANDALONE
190 void
debug_printf(const char * format,...)191 debug_printf(const char *format, ...)
192 {
193 char buf[UMEM_MAX_ERROR_SIZE] = "";
194
195 va_list va;
196
197 va_start(va, format);
198 (void) vsnprintf(buf, UMEM_MAX_ERROR_SIZE-1, format, va);
199 va_end(va);
200
201 (void) write(UMEM_ERRFD, buf, strlen(buf));
202 }
203 #endif
204
205 void
umem_vprintf(const char * format,va_list va)206 umem_vprintf(const char *format, va_list va)
207 {
208 char buf[UMEM_MAX_ERROR_SIZE] = "";
209
210 (void) vsnprintf(buf, UMEM_MAX_ERROR_SIZE-1, format, va);
211
212 umem_error_enter(buf);
213 }
214
215 void
umem_printf(const char * format,...)216 umem_printf(const char *format, ...)
217 {
218 va_list va;
219
220 va_start(va, format);
221 umem_vprintf(format, va);
222 va_end(va);
223 }
224
225 /*ARGSUSED*/
226 void
umem_printf_warn(void * ignored,const char * format,...)227 umem_printf_warn(void *ignored, const char *format, ...)
228 {
229 va_list va;
230
231 va_start(va, format);
232 umem_vprintf(format, va);
233 va_end(va);
234 }
235
236 /*
237 * print_sym tries to print out the symbol and offset of a pointer
238 */
239 int
print_sym(void * pointer)240 print_sym(void *pointer)
241 {
242 int result;
243 Dl_info sym_info;
244
245 uintptr_t end = (uintptr_t)NULL;
246
247 Sym *ext_info = NULL;
248
249 result = dladdr1(pointer, &sym_info, (void **)&ext_info,
250 RTLD_DL_SYMENT);
251
252 if (result != 0) {
253 const char *endpath;
254
255 end = (uintptr_t)sym_info.dli_saddr + ext_info->st_size;
256
257 endpath = strrchr(sym_info.dli_fname, '/');
258 if (endpath)
259 endpath++;
260 else
261 endpath = sym_info.dli_fname;
262 umem_printf("%s'", endpath);
263 }
264
265 if (result == 0 || (uintptr_t)pointer > end) {
266 umem_printf("?? (0x%p)", pointer);
267 return (0);
268 } else {
269 umem_printf("%s+0x%p", sym_info.dli_sname,
270 (char *)pointer - (char *)sym_info.dli_saddr);
271 return (1);
272 }
273 }
274