Commit | Line | Data |
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b13d93c2 PW |
1 | /* |
2 | * Copyright (C) 2013 Paul Woegerer <paul.woegerer@mentor.com> | |
8e2aed3f | 3 | * Copyright (C) 2015 Antoine Busque <abusque@efficios.com> |
97c7c238 | 4 | * Copyright (C) 2016 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
b13d93c2 PW |
5 | * |
6 | * This library is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU Lesser General Public | |
8 | * License as published by the Free Software Foundation; version 2.1 of | |
9 | * the License. | |
10 | * | |
11 | * This library is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | * Lesser General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU Lesser General Public | |
17 | * License along with this library; if not, write to the Free Software | |
18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
19 | */ | |
20 | ||
1ddceb36 | 21 | #define _LGPL_SOURCE |
13436238 | 22 | #include <limits.h> |
8e2aed3f | 23 | #include <stdio.h> |
fb31eb73 | 24 | #include <stdint.h> |
13436238 | 25 | #include <sys/types.h> |
8e2aed3f AB |
26 | #include <unistd.h> |
27 | ||
28 | #include <lttng/ust-dlfcn.h> | |
29 | #include <lttng/ust-elf.h> | |
97c7c238 | 30 | #include <lttng/ust-events.h> |
171fcc6f | 31 | #include <helper.h> |
eb2b066f | 32 | #include "usterr-signal-safe.h" |
b13d93c2 | 33 | |
8e2aed3f AB |
34 | /* Include link.h last else it conflicts with ust-dlfcn. */ |
35 | #include <link.h> | |
b13d93c2 | 36 | |
13436238 | 37 | #define TRACEPOINT_DEFINE |
6d4658aa | 38 | #include "ust_dl.h" |
13436238 | 39 | |
7b0fdd83 | 40 | static void *(*__lttng_ust_plibc_dlopen)(const char *filename, int flags); |
42330adc | 41 | #ifdef HAVE_DLMOPEN |
7b0fdd83 MD |
42 | static void *(*__lttng_ust_plibc_dlmopen)(Lmid_t nsid, const char *filename, |
43 | int flags); | |
42330adc | 44 | #endif |
b13d93c2 | 45 | static int (*__lttng_ust_plibc_dlclose)(void *handle); |
b13d93c2 PW |
46 | |
47 | static | |
7b0fdd83 | 48 | void *_lttng_ust_dl_libc_dlopen(const char *filename, int flags) |
b13d93c2 PW |
49 | { |
50 | if (!__lttng_ust_plibc_dlopen) { | |
51 | __lttng_ust_plibc_dlopen = dlsym(RTLD_NEXT, "dlopen"); | |
8e2aed3f | 52 | if (!__lttng_ust_plibc_dlopen) { |
b13d93c2 PW |
53 | fprintf(stderr, "%s\n", dlerror()); |
54 | return NULL; | |
55 | } | |
56 | } | |
7b0fdd83 MD |
57 | return __lttng_ust_plibc_dlopen(filename, flags); |
58 | } | |
59 | ||
42330adc | 60 | #ifdef HAVE_DLMOPEN |
7b0fdd83 MD |
61 | static |
62 | void *_lttng_ust_dl_libc_dlmopen(Lmid_t nsid, const char *filename, | |
63 | int flags) | |
64 | { | |
65 | if (!__lttng_ust_plibc_dlmopen) { | |
66 | __lttng_ust_plibc_dlmopen = dlsym(RTLD_NEXT, "dlmopen"); | |
67 | if (!__lttng_ust_plibc_dlmopen) { | |
68 | fprintf(stderr, "%s\n", dlerror()); | |
69 | return NULL; | |
70 | } | |
71 | } | |
72 | return __lttng_ust_plibc_dlmopen(nsid, filename, flags); | |
b13d93c2 | 73 | } |
42330adc | 74 | #endif |
b13d93c2 PW |
75 | |
76 | static | |
77 | int _lttng_ust_dl_libc_dlclose(void *handle) | |
78 | { | |
79 | if (!__lttng_ust_plibc_dlclose) { | |
80 | __lttng_ust_plibc_dlclose = dlsym(RTLD_NEXT, "dlclose"); | |
8e2aed3f | 81 | if (!__lttng_ust_plibc_dlclose) { |
b13d93c2 PW |
82 | fprintf(stderr, "%s\n", dlerror()); |
83 | return -1; | |
84 | } | |
85 | } | |
86 | return __lttng_ust_plibc_dlclose(handle); | |
87 | } | |
88 | ||
89 | static | |
7b0fdd83 MD |
90 | void lttng_ust_dl_dlopen(void *so_base, const char *so_name, |
91 | int flags, void *ip) | |
b13d93c2 | 92 | { |
13436238 | 93 | char resolved_path[PATH_MAX]; |
8e2aed3f AB |
94 | struct lttng_ust_elf *elf; |
95 | uint64_t memsz; | |
83215d66 | 96 | uint8_t *build_id = NULL; |
8e2aed3f | 97 | size_t build_id_len; |
83215d66 | 98 | char *dbg_file = NULL; |
8e2aed3f AB |
99 | uint32_t crc; |
100 | int has_build_id = 0, has_debug_link = 0; | |
101 | int ret; | |
b13d93c2 | 102 | |
13436238 PW |
103 | if (!realpath(so_name, resolved_path)) { |
104 | ERR("could not resolve path '%s'", so_name); | |
105 | return; | |
b13d93c2 | 106 | } |
b13d93c2 | 107 | |
8e2aed3f AB |
108 | elf = lttng_ust_elf_create(resolved_path); |
109 | if (!elf) { | |
09026ccf | 110 | ERR("could not access file %s", resolved_path); |
13436238 | 111 | return; |
b13d93c2 | 112 | } |
13436238 | 113 | |
8e2aed3f AB |
114 | ret = lttng_ust_elf_get_memsz(elf, &memsz); |
115 | if (ret) { | |
116 | goto end; | |
117 | } | |
118 | ret = lttng_ust_elf_get_build_id( | |
119 | elf, &build_id, &build_id_len, &has_build_id); | |
120 | if (ret) { | |
121 | goto end; | |
122 | } | |
123 | ret = lttng_ust_elf_get_debug_link( | |
124 | elf, &dbg_file, &crc, &has_debug_link); | |
125 | if (ret) { | |
126 | goto end; | |
127 | } | |
128 | ||
6d4658aa | 129 | tracepoint(lttng_ust_dl, dlopen, |
7b0fdd83 | 130 | ip, so_base, resolved_path, flags, memsz, |
c5c4fd82 | 131 | has_build_id, has_debug_link); |
8e2aed3f AB |
132 | |
133 | if (has_build_id) { | |
134 | tracepoint(lttng_ust_dl, build_id, | |
135 | ip, so_base, build_id, build_id_len); | |
8e2aed3f AB |
136 | } |
137 | ||
138 | if (has_debug_link) { | |
139 | tracepoint(lttng_ust_dl, debug_link, | |
140 | ip, so_base, dbg_file, crc); | |
8e2aed3f AB |
141 | } |
142 | ||
143 | end: | |
83215d66 MD |
144 | free(dbg_file); |
145 | free(build_id); | |
8e2aed3f | 146 | lttng_ust_elf_destroy(elf); |
13436238 | 147 | return; |
b13d93c2 PW |
148 | } |
149 | ||
42330adc | 150 | #ifdef HAVE_DLMOPEN |
7b0fdd83 MD |
151 | static |
152 | void lttng_ust_dl_dlmopen(void *so_base, Lmid_t nsid, const char *so_name, | |
153 | int flags, void *ip) | |
154 | { | |
155 | char resolved_path[PATH_MAX]; | |
156 | struct lttng_ust_elf *elf; | |
157 | uint64_t memsz; | |
158 | uint8_t *build_id = NULL; | |
159 | size_t build_id_len; | |
160 | char *dbg_file = NULL; | |
161 | uint32_t crc; | |
162 | int has_build_id = 0, has_debug_link = 0; | |
163 | int ret; | |
164 | ||
165 | if (!realpath(so_name, resolved_path)) { | |
166 | ERR("could not resolve path '%s'", so_name); | |
167 | return; | |
168 | } | |
169 | ||
170 | elf = lttng_ust_elf_create(resolved_path); | |
171 | if (!elf) { | |
09026ccf | 172 | ERR("could not access file %s", resolved_path); |
7b0fdd83 MD |
173 | return; |
174 | } | |
175 | ||
176 | ret = lttng_ust_elf_get_memsz(elf, &memsz); | |
177 | if (ret) { | |
178 | goto end; | |
179 | } | |
180 | ret = lttng_ust_elf_get_build_id( | |
181 | elf, &build_id, &build_id_len, &has_build_id); | |
182 | if (ret) { | |
183 | goto end; | |
184 | } | |
185 | ret = lttng_ust_elf_get_debug_link( | |
186 | elf, &dbg_file, &crc, &has_debug_link); | |
187 | if (ret) { | |
188 | goto end; | |
189 | } | |
190 | ||
191 | tracepoint(lttng_ust_dl, dlmopen, | |
192 | ip, so_base, nsid, resolved_path, flags, memsz, | |
193 | has_build_id, has_debug_link); | |
194 | ||
195 | if (has_build_id) { | |
196 | tracepoint(lttng_ust_dl, build_id, | |
197 | ip, so_base, build_id, build_id_len); | |
198 | } | |
199 | ||
200 | if (has_debug_link) { | |
201 | tracepoint(lttng_ust_dl, debug_link, | |
202 | ip, so_base, dbg_file, crc); | |
203 | } | |
204 | ||
205 | end: | |
206 | free(dbg_file); | |
207 | free(build_id); | |
208 | lttng_ust_elf_destroy(elf); | |
209 | return; | |
210 | } | |
42330adc | 211 | #endif |
7b0fdd83 MD |
212 | |
213 | void *dlopen(const char *filename, int flags) | |
b13d93c2 | 214 | { |
8e2aed3f AB |
215 | void *handle; |
216 | ||
7b0fdd83 | 217 | handle = _lttng_ust_dl_libc_dlopen(filename, flags); |
bd703713 | 218 | if (__tracepoint_ptrs_registered && handle) { |
b13d93c2 | 219 | struct link_map *p = NULL; |
8e2aed3f AB |
220 | int ret; |
221 | ||
222 | ret = dlinfo(handle, RTLD_DI_LINKMAP, &p); | |
223 | if (ret != -1 && p != NULL && p->l_addr != 0) { | |
97c7c238 | 224 | lttng_ust_dl_dlopen((void *) p->l_addr, |
7b0fdd83 MD |
225 | p->l_name, flags, LTTNG_UST_CALLER_IP()); |
226 | } | |
227 | } | |
228 | lttng_ust_dl_update(LTTNG_UST_CALLER_IP()); | |
229 | return handle; | |
230 | } | |
231 | ||
42330adc | 232 | #ifdef HAVE_DLMOPEN |
7b0fdd83 MD |
233 | void *dlmopen(Lmid_t nsid, const char *filename, int flags) |
234 | { | |
235 | void *handle; | |
236 | ||
237 | handle = _lttng_ust_dl_libc_dlmopen(nsid, filename, flags); | |
238 | if (__tracepoint_ptrs_registered && handle) { | |
239 | struct link_map *p = NULL; | |
240 | int ret; | |
241 | ||
242 | ret = dlinfo(handle, RTLD_DI_LINKMAP, &p); | |
243 | if (ret != -1 && p != NULL && p->l_addr != 0) { | |
244 | lttng_ust_dl_dlmopen((void *) p->l_addr, | |
245 | nsid, p->l_name, flags, | |
171fcc6f | 246 | LTTNG_UST_CALLER_IP()); |
8e2aed3f | 247 | } |
b13d93c2 | 248 | } |
97c7c238 | 249 | lttng_ust_dl_update(LTTNG_UST_CALLER_IP()); |
b13d93c2 | 250 | return handle; |
7b0fdd83 | 251 | |
b13d93c2 | 252 | } |
42330adc | 253 | #endif |
b13d93c2 PW |
254 | |
255 | int dlclose(void *handle) | |
256 | { | |
97c7c238 MD |
257 | int ret; |
258 | ||
e7953e6e | 259 | if (__tracepoint_ptrs_registered) { |
b13d93c2 | 260 | struct link_map *p = NULL; |
8e2aed3f AB |
261 | |
262 | ret = dlinfo(handle, RTLD_DI_LINKMAP, &p); | |
263 | if (ret != -1 && p != NULL && p->l_addr != 0) { | |
264 | tracepoint(lttng_ust_dl, dlclose, | |
171fcc6f | 265 | LTTNG_UST_CALLER_IP(), |
8e2aed3f AB |
266 | (void *) p->l_addr); |
267 | } | |
b13d93c2 | 268 | } |
97c7c238 MD |
269 | ret = _lttng_ust_dl_libc_dlclose(handle); |
270 | lttng_ust_dl_update(LTTNG_UST_CALLER_IP()); | |
271 | return ret; | |
b13d93c2 | 272 | } |