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" | |
b13d93c2 | 24 | |
6339062a | 25 | #include "lib/lttng-ust/ust-events-internal.h" |
cbba5e04 | 26 | |
8e2aed3f AB |
27 | /* Include link.h last else it conflicts with ust-dlfcn. */ |
28 | #include <link.h> | |
b13d93c2 | 29 | |
13436238 | 30 | #define TRACEPOINT_DEFINE |
6d4658aa | 31 | #include "ust_dl.h" |
13436238 | 32 | |
7b0fdd83 | 33 | static void *(*__lttng_ust_plibc_dlopen)(const char *filename, int flags); |
42330adc | 34 | #ifdef HAVE_DLMOPEN |
7b0fdd83 MD |
35 | static void *(*__lttng_ust_plibc_dlmopen)(Lmid_t nsid, const char *filename, |
36 | int flags); | |
42330adc | 37 | #endif |
b13d93c2 | 38 | static int (*__lttng_ust_plibc_dlclose)(void *handle); |
b13d93c2 | 39 | |
465a0d04 MJ |
40 | static |
41 | void _lttng_ust_dl_init(void) | |
42 | __attribute__((constructor)); | |
43 | static | |
2b6f4374 MJ |
44 | void _lttng_ust_dl_init(void) |
45 | { | |
46 | ust_err_init(); | |
47 | } | |
48 | ||
b13d93c2 | 49 | static |
7b0fdd83 | 50 | void *_lttng_ust_dl_libc_dlopen(const char *filename, int flags) |
b13d93c2 PW |
51 | { |
52 | if (!__lttng_ust_plibc_dlopen) { | |
53 | __lttng_ust_plibc_dlopen = dlsym(RTLD_NEXT, "dlopen"); | |
8e2aed3f | 54 | if (!__lttng_ust_plibc_dlopen) { |
b13d93c2 PW |
55 | fprintf(stderr, "%s\n", dlerror()); |
56 | return NULL; | |
57 | } | |
58 | } | |
7b0fdd83 MD |
59 | return __lttng_ust_plibc_dlopen(filename, flags); |
60 | } | |
61 | ||
42330adc | 62 | #ifdef HAVE_DLMOPEN |
7b0fdd83 MD |
63 | static |
64 | void *_lttng_ust_dl_libc_dlmopen(Lmid_t nsid, const char *filename, | |
65 | int flags) | |
66 | { | |
67 | if (!__lttng_ust_plibc_dlmopen) { | |
68 | __lttng_ust_plibc_dlmopen = dlsym(RTLD_NEXT, "dlmopen"); | |
69 | if (!__lttng_ust_plibc_dlmopen) { | |
70 | fprintf(stderr, "%s\n", dlerror()); | |
71 | return NULL; | |
72 | } | |
73 | } | |
74 | return __lttng_ust_plibc_dlmopen(nsid, filename, flags); | |
b13d93c2 | 75 | } |
42330adc | 76 | #endif |
b13d93c2 PW |
77 | |
78 | static | |
79 | int _lttng_ust_dl_libc_dlclose(void *handle) | |
80 | { | |
81 | if (!__lttng_ust_plibc_dlclose) { | |
82 | __lttng_ust_plibc_dlclose = dlsym(RTLD_NEXT, "dlclose"); | |
8e2aed3f | 83 | if (!__lttng_ust_plibc_dlclose) { |
b13d93c2 PW |
84 | fprintf(stderr, "%s\n", dlerror()); |
85 | return -1; | |
86 | } | |
87 | } | |
88 | return __lttng_ust_plibc_dlclose(handle); | |
89 | } | |
90 | ||
91 | static | |
7b0fdd83 MD |
92 | void lttng_ust_dl_dlopen(void *so_base, const char *so_name, |
93 | int flags, void *ip) | |
b13d93c2 | 94 | { |
13436238 | 95 | char resolved_path[PATH_MAX]; |
8e2aed3f AB |
96 | struct lttng_ust_elf *elf; |
97 | uint64_t memsz; | |
83215d66 | 98 | uint8_t *build_id = NULL; |
8e2aed3f | 99 | size_t build_id_len; |
83215d66 | 100 | char *dbg_file = NULL; |
8e2aed3f AB |
101 | uint32_t crc; |
102 | int has_build_id = 0, has_debug_link = 0; | |
103 | int ret; | |
b13d93c2 | 104 | |
13436238 PW |
105 | if (!realpath(so_name, resolved_path)) { |
106 | ERR("could not resolve path '%s'", so_name); | |
107 | return; | |
b13d93c2 | 108 | } |
b13d93c2 | 109 | |
8e2aed3f AB |
110 | elf = lttng_ust_elf_create(resolved_path); |
111 | if (!elf) { | |
09026ccf | 112 | ERR("could not access file %s", resolved_path); |
13436238 | 113 | return; |
b13d93c2 | 114 | } |
13436238 | 115 | |
8e2aed3f AB |
116 | ret = lttng_ust_elf_get_memsz(elf, &memsz); |
117 | if (ret) { | |
118 | goto end; | |
119 | } | |
120 | ret = lttng_ust_elf_get_build_id( | |
121 | elf, &build_id, &build_id_len, &has_build_id); | |
122 | if (ret) { | |
123 | goto end; | |
124 | } | |
125 | ret = lttng_ust_elf_get_debug_link( | |
126 | elf, &dbg_file, &crc, &has_debug_link); | |
127 | if (ret) { | |
128 | goto end; | |
129 | } | |
130 | ||
6d4658aa | 131 | tracepoint(lttng_ust_dl, dlopen, |
7b0fdd83 | 132 | ip, so_base, resolved_path, flags, memsz, |
c5c4fd82 | 133 | has_build_id, has_debug_link); |
8e2aed3f AB |
134 | |
135 | if (has_build_id) { | |
136 | tracepoint(lttng_ust_dl, build_id, | |
137 | ip, so_base, build_id, build_id_len); | |
8e2aed3f AB |
138 | } |
139 | ||
140 | if (has_debug_link) { | |
141 | tracepoint(lttng_ust_dl, debug_link, | |
142 | ip, so_base, dbg_file, crc); | |
8e2aed3f AB |
143 | } |
144 | ||
145 | end: | |
83215d66 MD |
146 | free(dbg_file); |
147 | free(build_id); | |
8e2aed3f | 148 | lttng_ust_elf_destroy(elf); |
13436238 | 149 | return; |
b13d93c2 PW |
150 | } |
151 | ||
42330adc | 152 | #ifdef HAVE_DLMOPEN |
7b0fdd83 MD |
153 | static |
154 | void lttng_ust_dl_dlmopen(void *so_base, Lmid_t nsid, const char *so_name, | |
155 | int flags, void *ip) | |
156 | { | |
157 | char resolved_path[PATH_MAX]; | |
158 | struct lttng_ust_elf *elf; | |
159 | uint64_t memsz; | |
160 | uint8_t *build_id = NULL; | |
161 | size_t build_id_len; | |
162 | char *dbg_file = NULL; | |
163 | uint32_t crc; | |
164 | int has_build_id = 0, has_debug_link = 0; | |
165 | int ret; | |
166 | ||
167 | if (!realpath(so_name, resolved_path)) { | |
168 | ERR("could not resolve path '%s'", so_name); | |
169 | return; | |
170 | } | |
171 | ||
172 | elf = lttng_ust_elf_create(resolved_path); | |
173 | if (!elf) { | |
09026ccf | 174 | ERR("could not access file %s", resolved_path); |
7b0fdd83 MD |
175 | return; |
176 | } | |
177 | ||
178 | ret = lttng_ust_elf_get_memsz(elf, &memsz); | |
179 | if (ret) { | |
180 | goto end; | |
181 | } | |
182 | ret = lttng_ust_elf_get_build_id( | |
183 | elf, &build_id, &build_id_len, &has_build_id); | |
184 | if (ret) { | |
185 | goto end; | |
186 | } | |
187 | ret = lttng_ust_elf_get_debug_link( | |
188 | elf, &dbg_file, &crc, &has_debug_link); | |
189 | if (ret) { | |
190 | goto end; | |
191 | } | |
192 | ||
193 | tracepoint(lttng_ust_dl, dlmopen, | |
194 | ip, so_base, nsid, resolved_path, flags, memsz, | |
195 | has_build_id, has_debug_link); | |
196 | ||
197 | if (has_build_id) { | |
198 | tracepoint(lttng_ust_dl, build_id, | |
199 | ip, so_base, build_id, build_id_len); | |
200 | } | |
201 | ||
202 | if (has_debug_link) { | |
203 | tracepoint(lttng_ust_dl, debug_link, | |
204 | ip, so_base, dbg_file, crc); | |
205 | } | |
206 | ||
207 | end: | |
208 | free(dbg_file); | |
209 | free(build_id); | |
210 | lttng_ust_elf_destroy(elf); | |
211 | return; | |
212 | } | |
42330adc | 213 | #endif |
7b0fdd83 MD |
214 | |
215 | void *dlopen(const char *filename, int flags) | |
b13d93c2 | 216 | { |
8e2aed3f AB |
217 | void *handle; |
218 | ||
7b0fdd83 | 219 | handle = _lttng_ust_dl_libc_dlopen(filename, flags); |
bd703713 | 220 | if (__tracepoint_ptrs_registered && handle) { |
b13d93c2 | 221 | struct link_map *p = NULL; |
8e2aed3f AB |
222 | int ret; |
223 | ||
224 | ret = dlinfo(handle, RTLD_DI_LINKMAP, &p); | |
225 | if (ret != -1 && p != NULL && p->l_addr != 0) { | |
97c7c238 | 226 | lttng_ust_dl_dlopen((void *) p->l_addr, |
7b0fdd83 MD |
227 | p->l_name, flags, LTTNG_UST_CALLER_IP()); |
228 | } | |
229 | } | |
230 | lttng_ust_dl_update(LTTNG_UST_CALLER_IP()); | |
231 | return handle; | |
232 | } | |
233 | ||
42330adc | 234 | #ifdef HAVE_DLMOPEN |
7b0fdd83 MD |
235 | void *dlmopen(Lmid_t nsid, const char *filename, int flags) |
236 | { | |
237 | void *handle; | |
238 | ||
239 | handle = _lttng_ust_dl_libc_dlmopen(nsid, filename, flags); | |
240 | if (__tracepoint_ptrs_registered && handle) { | |
241 | struct link_map *p = NULL; | |
242 | int ret; | |
243 | ||
244 | ret = dlinfo(handle, RTLD_DI_LINKMAP, &p); | |
245 | if (ret != -1 && p != NULL && p->l_addr != 0) { | |
246 | lttng_ust_dl_dlmopen((void *) p->l_addr, | |
247 | nsid, p->l_name, flags, | |
171fcc6f | 248 | LTTNG_UST_CALLER_IP()); |
8e2aed3f | 249 | } |
b13d93c2 | 250 | } |
97c7c238 | 251 | lttng_ust_dl_update(LTTNG_UST_CALLER_IP()); |
b13d93c2 | 252 | return handle; |
7b0fdd83 | 253 | |
b13d93c2 | 254 | } |
42330adc | 255 | #endif |
b13d93c2 PW |
256 | |
257 | int dlclose(void *handle) | |
258 | { | |
97c7c238 MD |
259 | int ret; |
260 | ||
e7953e6e | 261 | if (__tracepoint_ptrs_registered) { |
b13d93c2 | 262 | struct link_map *p = NULL; |
8e2aed3f AB |
263 | |
264 | ret = dlinfo(handle, RTLD_DI_LINKMAP, &p); | |
265 | if (ret != -1 && p != NULL && p->l_addr != 0) { | |
266 | tracepoint(lttng_ust_dl, dlclose, | |
171fcc6f | 267 | LTTNG_UST_CALLER_IP(), |
8e2aed3f AB |
268 | (void *) p->l_addr); |
269 | } | |
b13d93c2 | 270 | } |
97c7c238 MD |
271 | ret = _lttng_ust_dl_libc_dlclose(handle); |
272 | lttng_ust_dl_update(LTTNG_UST_CALLER_IP()); | |
273 | return ret; | |
b13d93c2 | 274 | } |