Commit | Line | Data |
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b13d93c2 | 1 | /* |
c0c0989a | 2 | * SPDX-License-Identifier: LGPL-2.1-only |
b13d93c2 | 3 | * |
c0c0989a MJ |
4 | * Copyright (C) 2013 Paul Woegerer <paul.woegerer@mentor.com> |
5 | * Copyright (C) 2015 Antoine Busque <abusque@efficios.com> | |
6 | * Copyright (C) 2016 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
b13d93c2 PW |
7 | */ |
8 | ||
1ddceb36 | 9 | #define _LGPL_SOURCE |
9d315d6d MJ |
10 | |
11 | /* Has to be included first to override dlfcn.h */ | |
12 | #include <common/compat/dlfcn.h> | |
13 | ||
13436238 | 14 | #include <limits.h> |
8e2aed3f | 15 | #include <stdio.h> |
fb31eb73 | 16 | #include <stdint.h> |
13436238 | 17 | #include <sys/types.h> |
8e2aed3f AB |
18 | #include <unistd.h> |
19 | ||
9d315d6d | 20 | #include "common/elf.h" |
97c7c238 | 21 | #include <lttng/ust-events.h> |
9d315d6d MJ |
22 | #include "common/macros.h" |
23 | #include "common/logging.h" | |
36c52fff | 24 | #include "common/events.h" |
cbba5e04 | 25 | |
8e2aed3f AB |
26 | /* Include link.h last else it conflicts with ust-dlfcn. */ |
27 | #include <link.h> | |
b13d93c2 | 28 | |
13436238 | 29 | #define TRACEPOINT_DEFINE |
6d4658aa | 30 | #include "ust_dl.h" |
13436238 | 31 | |
7b0fdd83 | 32 | static void *(*__lttng_ust_plibc_dlopen)(const char *filename, int flags); |
42330adc | 33 | #ifdef HAVE_DLMOPEN |
7b0fdd83 MD |
34 | static void *(*__lttng_ust_plibc_dlmopen)(Lmid_t nsid, const char *filename, |
35 | int flags); | |
42330adc | 36 | #endif |
b13d93c2 | 37 | static int (*__lttng_ust_plibc_dlclose)(void *handle); |
b13d93c2 | 38 | |
465a0d04 MJ |
39 | static |
40 | void _lttng_ust_dl_init(void) | |
41 | __attribute__((constructor)); | |
42 | static | |
2b6f4374 MJ |
43 | void _lttng_ust_dl_init(void) |
44 | { | |
c6e6343c | 45 | lttng_ust_logging_init(); |
2b6f4374 MJ |
46 | } |
47 | ||
b13d93c2 | 48 | static |
7b0fdd83 | 49 | void *_lttng_ust_dl_libc_dlopen(const char *filename, int flags) |
b13d93c2 PW |
50 | { |
51 | if (!__lttng_ust_plibc_dlopen) { | |
52 | __lttng_ust_plibc_dlopen = dlsym(RTLD_NEXT, "dlopen"); | |
8e2aed3f | 53 | if (!__lttng_ust_plibc_dlopen) { |
b13d93c2 PW |
54 | fprintf(stderr, "%s\n", dlerror()); |
55 | return NULL; | |
56 | } | |
57 | } | |
7b0fdd83 MD |
58 | return __lttng_ust_plibc_dlopen(filename, flags); |
59 | } | |
60 | ||
42330adc | 61 | #ifdef HAVE_DLMOPEN |
7b0fdd83 MD |
62 | static |
63 | void *_lttng_ust_dl_libc_dlmopen(Lmid_t nsid, const char *filename, | |
64 | int flags) | |
65 | { | |
66 | if (!__lttng_ust_plibc_dlmopen) { | |
67 | __lttng_ust_plibc_dlmopen = dlsym(RTLD_NEXT, "dlmopen"); | |
68 | if (!__lttng_ust_plibc_dlmopen) { | |
69 | fprintf(stderr, "%s\n", dlerror()); | |
70 | return NULL; | |
71 | } | |
72 | } | |
73 | return __lttng_ust_plibc_dlmopen(nsid, filename, flags); | |
b13d93c2 | 74 | } |
42330adc | 75 | #endif |
b13d93c2 PW |
76 | |
77 | static | |
78 | int _lttng_ust_dl_libc_dlclose(void *handle) | |
79 | { | |
80 | if (!__lttng_ust_plibc_dlclose) { | |
81 | __lttng_ust_plibc_dlclose = dlsym(RTLD_NEXT, "dlclose"); | |
8e2aed3f | 82 | if (!__lttng_ust_plibc_dlclose) { |
b13d93c2 PW |
83 | fprintf(stderr, "%s\n", dlerror()); |
84 | return -1; | |
85 | } | |
86 | } | |
87 | return __lttng_ust_plibc_dlclose(handle); | |
88 | } | |
89 | ||
90 | static | |
7b0fdd83 MD |
91 | void lttng_ust_dl_dlopen(void *so_base, const char *so_name, |
92 | int flags, void *ip) | |
b13d93c2 | 93 | { |
13436238 | 94 | char resolved_path[PATH_MAX]; |
8e2aed3f AB |
95 | struct lttng_ust_elf *elf; |
96 | uint64_t memsz; | |
83215d66 | 97 | uint8_t *build_id = NULL; |
8e2aed3f | 98 | size_t build_id_len; |
83215d66 | 99 | char *dbg_file = NULL; |
8e2aed3f AB |
100 | uint32_t crc; |
101 | int has_build_id = 0, has_debug_link = 0; | |
102 | int ret; | |
b13d93c2 | 103 | |
13436238 PW |
104 | if (!realpath(so_name, resolved_path)) { |
105 | ERR("could not resolve path '%s'", so_name); | |
106 | return; | |
b13d93c2 | 107 | } |
b13d93c2 | 108 | |
8e2aed3f AB |
109 | elf = lttng_ust_elf_create(resolved_path); |
110 | if (!elf) { | |
09026ccf | 111 | ERR("could not access file %s", resolved_path); |
13436238 | 112 | return; |
b13d93c2 | 113 | } |
13436238 | 114 | |
8e2aed3f AB |
115 | ret = lttng_ust_elf_get_memsz(elf, &memsz); |
116 | if (ret) { | |
117 | goto end; | |
118 | } | |
119 | ret = lttng_ust_elf_get_build_id( | |
120 | elf, &build_id, &build_id_len, &has_build_id); | |
121 | if (ret) { | |
122 | goto end; | |
123 | } | |
124 | ret = lttng_ust_elf_get_debug_link( | |
125 | elf, &dbg_file, &crc, &has_debug_link); | |
126 | if (ret) { | |
127 | goto end; | |
128 | } | |
129 | ||
6d4658aa | 130 | tracepoint(lttng_ust_dl, dlopen, |
7b0fdd83 | 131 | ip, so_base, resolved_path, flags, memsz, |
c5c4fd82 | 132 | has_build_id, has_debug_link); |
8e2aed3f AB |
133 | |
134 | if (has_build_id) { | |
135 | tracepoint(lttng_ust_dl, build_id, | |
136 | ip, so_base, build_id, build_id_len); | |
8e2aed3f AB |
137 | } |
138 | ||
139 | if (has_debug_link) { | |
140 | tracepoint(lttng_ust_dl, debug_link, | |
141 | ip, so_base, dbg_file, crc); | |
8e2aed3f AB |
142 | } |
143 | ||
144 | end: | |
83215d66 MD |
145 | free(dbg_file); |
146 | free(build_id); | |
8e2aed3f | 147 | lttng_ust_elf_destroy(elf); |
13436238 | 148 | return; |
b13d93c2 PW |
149 | } |
150 | ||
42330adc | 151 | #ifdef HAVE_DLMOPEN |
7b0fdd83 MD |
152 | static |
153 | void lttng_ust_dl_dlmopen(void *so_base, Lmid_t nsid, const char *so_name, | |
154 | int flags, void *ip) | |
155 | { | |
156 | char resolved_path[PATH_MAX]; | |
157 | struct lttng_ust_elf *elf; | |
158 | uint64_t memsz; | |
159 | uint8_t *build_id = NULL; | |
160 | size_t build_id_len; | |
161 | char *dbg_file = NULL; | |
162 | uint32_t crc; | |
163 | int has_build_id = 0, has_debug_link = 0; | |
164 | int ret; | |
165 | ||
166 | if (!realpath(so_name, resolved_path)) { | |
167 | ERR("could not resolve path '%s'", so_name); | |
168 | return; | |
169 | } | |
170 | ||
171 | elf = lttng_ust_elf_create(resolved_path); | |
172 | if (!elf) { | |
09026ccf | 173 | ERR("could not access file %s", resolved_path); |
7b0fdd83 MD |
174 | return; |
175 | } | |
176 | ||
177 | ret = lttng_ust_elf_get_memsz(elf, &memsz); | |
178 | if (ret) { | |
179 | goto end; | |
180 | } | |
181 | ret = lttng_ust_elf_get_build_id( | |
182 | elf, &build_id, &build_id_len, &has_build_id); | |
183 | if (ret) { | |
184 | goto end; | |
185 | } | |
186 | ret = lttng_ust_elf_get_debug_link( | |
187 | elf, &dbg_file, &crc, &has_debug_link); | |
188 | if (ret) { | |
189 | goto end; | |
190 | } | |
191 | ||
192 | tracepoint(lttng_ust_dl, dlmopen, | |
193 | ip, so_base, nsid, resolved_path, flags, memsz, | |
194 | has_build_id, has_debug_link); | |
195 | ||
196 | if (has_build_id) { | |
197 | tracepoint(lttng_ust_dl, build_id, | |
198 | ip, so_base, build_id, build_id_len); | |
199 | } | |
200 | ||
201 | if (has_debug_link) { | |
202 | tracepoint(lttng_ust_dl, debug_link, | |
203 | ip, so_base, dbg_file, crc); | |
204 | } | |
205 | ||
206 | end: | |
207 | free(dbg_file); | |
208 | free(build_id); | |
209 | lttng_ust_elf_destroy(elf); | |
210 | return; | |
211 | } | |
42330adc | 212 | #endif |
7b0fdd83 MD |
213 | |
214 | void *dlopen(const char *filename, int flags) | |
b13d93c2 | 215 | { |
8e2aed3f AB |
216 | void *handle; |
217 | ||
7b0fdd83 | 218 | handle = _lttng_ust_dl_libc_dlopen(filename, flags); |
bd703713 | 219 | if (__tracepoint_ptrs_registered && handle) { |
b13d93c2 | 220 | struct link_map *p = NULL; |
8e2aed3f AB |
221 | int ret; |
222 | ||
223 | ret = dlinfo(handle, RTLD_DI_LINKMAP, &p); | |
224 | if (ret != -1 && p != NULL && p->l_addr != 0) { | |
97c7c238 | 225 | lttng_ust_dl_dlopen((void *) p->l_addr, |
7b0fdd83 MD |
226 | p->l_name, flags, LTTNG_UST_CALLER_IP()); |
227 | } | |
228 | } | |
229 | lttng_ust_dl_update(LTTNG_UST_CALLER_IP()); | |
230 | return handle; | |
231 | } | |
232 | ||
42330adc | 233 | #ifdef HAVE_DLMOPEN |
7b0fdd83 MD |
234 | void *dlmopen(Lmid_t nsid, const char *filename, int flags) |
235 | { | |
236 | void *handle; | |
237 | ||
238 | handle = _lttng_ust_dl_libc_dlmopen(nsid, filename, flags); | |
239 | if (__tracepoint_ptrs_registered && handle) { | |
240 | struct link_map *p = NULL; | |
241 | int ret; | |
242 | ||
243 | ret = dlinfo(handle, RTLD_DI_LINKMAP, &p); | |
244 | if (ret != -1 && p != NULL && p->l_addr != 0) { | |
245 | lttng_ust_dl_dlmopen((void *) p->l_addr, | |
246 | nsid, p->l_name, flags, | |
171fcc6f | 247 | LTTNG_UST_CALLER_IP()); |
8e2aed3f | 248 | } |
b13d93c2 | 249 | } |
97c7c238 | 250 | lttng_ust_dl_update(LTTNG_UST_CALLER_IP()); |
b13d93c2 | 251 | return handle; |
7b0fdd83 | 252 | |
b13d93c2 | 253 | } |
42330adc | 254 | #endif |
b13d93c2 PW |
255 | |
256 | int dlclose(void *handle) | |
257 | { | |
97c7c238 MD |
258 | int ret; |
259 | ||
e7953e6e | 260 | if (__tracepoint_ptrs_registered) { |
b13d93c2 | 261 | struct link_map *p = NULL; |
8e2aed3f AB |
262 | |
263 | ret = dlinfo(handle, RTLD_DI_LINKMAP, &p); | |
264 | if (ret != -1 && p != NULL && p->l_addr != 0) { | |
265 | tracepoint(lttng_ust_dl, dlclose, | |
171fcc6f | 266 | LTTNG_UST_CALLER_IP(), |
8e2aed3f AB |
267 | (void *) p->l_addr); |
268 | } | |
b13d93c2 | 269 | } |
97c7c238 MD |
270 | ret = _lttng_ust_dl_libc_dlclose(handle); |
271 | lttng_ust_dl_update(LTTNG_UST_CALLER_IP()); | |
272 | return ret; | |
b13d93c2 | 273 | } |