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 | ||
21 | #define _GNU_SOURCE | |
1ddceb36 | 22 | #define _LGPL_SOURCE |
13436238 | 23 | #include <limits.h> |
8e2aed3f | 24 | #include <stdio.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 | |
b13d93c2 PW |
40 | static void *(*__lttng_ust_plibc_dlopen)(const char *filename, int flag); |
41 | static int (*__lttng_ust_plibc_dlclose)(void *handle); | |
b13d93c2 PW |
42 | |
43 | static | |
44 | void *_lttng_ust_dl_libc_dlopen(const char *filename, int flag) | |
45 | { | |
46 | if (!__lttng_ust_plibc_dlopen) { | |
47 | __lttng_ust_plibc_dlopen = dlsym(RTLD_NEXT, "dlopen"); | |
8e2aed3f | 48 | if (!__lttng_ust_plibc_dlopen) { |
b13d93c2 PW |
49 | fprintf(stderr, "%s\n", dlerror()); |
50 | return NULL; | |
51 | } | |
52 | } | |
53 | return __lttng_ust_plibc_dlopen(filename, flag); | |
54 | } | |
55 | ||
56 | static | |
57 | int _lttng_ust_dl_libc_dlclose(void *handle) | |
58 | { | |
59 | if (!__lttng_ust_plibc_dlclose) { | |
60 | __lttng_ust_plibc_dlclose = dlsym(RTLD_NEXT, "dlclose"); | |
8e2aed3f | 61 | if (!__lttng_ust_plibc_dlclose) { |
b13d93c2 PW |
62 | fprintf(stderr, "%s\n", dlerror()); |
63 | return -1; | |
64 | } | |
65 | } | |
66 | return __lttng_ust_plibc_dlclose(handle); | |
67 | } | |
68 | ||
69 | static | |
03db42de | 70 | void lttng_ust_dl_dlopen(void *so_base, const char *so_name, void *ip) |
b13d93c2 | 71 | { |
13436238 | 72 | char resolved_path[PATH_MAX]; |
8e2aed3f AB |
73 | struct lttng_ust_elf *elf; |
74 | uint64_t memsz; | |
83215d66 | 75 | uint8_t *build_id = NULL; |
8e2aed3f | 76 | size_t build_id_len; |
83215d66 | 77 | char *dbg_file = NULL; |
8e2aed3f AB |
78 | uint32_t crc; |
79 | int has_build_id = 0, has_debug_link = 0; | |
80 | int ret; | |
b13d93c2 | 81 | |
13436238 PW |
82 | if (!realpath(so_name, resolved_path)) { |
83 | ERR("could not resolve path '%s'", so_name); | |
84 | return; | |
b13d93c2 | 85 | } |
b13d93c2 | 86 | |
8e2aed3f AB |
87 | elf = lttng_ust_elf_create(resolved_path); |
88 | if (!elf) { | |
89 | ERR("could not acces file %s", resolved_path); | |
13436238 | 90 | return; |
b13d93c2 | 91 | } |
13436238 | 92 | |
8e2aed3f AB |
93 | ret = lttng_ust_elf_get_memsz(elf, &memsz); |
94 | if (ret) { | |
95 | goto end; | |
96 | } | |
97 | ret = lttng_ust_elf_get_build_id( | |
98 | elf, &build_id, &build_id_len, &has_build_id); | |
99 | if (ret) { | |
100 | goto end; | |
101 | } | |
102 | ret = lttng_ust_elf_get_debug_link( | |
103 | elf, &dbg_file, &crc, &has_debug_link); | |
104 | if (ret) { | |
105 | goto end; | |
106 | } | |
107 | ||
6d4658aa | 108 | tracepoint(lttng_ust_dl, dlopen, |
c5c4fd82 MD |
109 | ip, so_base, resolved_path, memsz, |
110 | has_build_id, has_debug_link); | |
8e2aed3f AB |
111 | |
112 | if (has_build_id) { | |
113 | tracepoint(lttng_ust_dl, build_id, | |
114 | ip, so_base, build_id, build_id_len); | |
8e2aed3f AB |
115 | } |
116 | ||
117 | if (has_debug_link) { | |
118 | tracepoint(lttng_ust_dl, debug_link, | |
119 | ip, so_base, dbg_file, crc); | |
8e2aed3f AB |
120 | } |
121 | ||
122 | end: | |
83215d66 MD |
123 | free(dbg_file); |
124 | free(build_id); | |
8e2aed3f | 125 | lttng_ust_elf_destroy(elf); |
13436238 | 126 | return; |
b13d93c2 PW |
127 | } |
128 | ||
129 | void *dlopen(const char *filename, int flag) | |
130 | { | |
8e2aed3f AB |
131 | void *handle; |
132 | ||
133 | handle = _lttng_ust_dl_libc_dlopen(filename, flag); | |
bd703713 | 134 | if (__tracepoint_ptrs_registered && handle) { |
b13d93c2 | 135 | struct link_map *p = NULL; |
8e2aed3f AB |
136 | int ret; |
137 | ||
138 | ret = dlinfo(handle, RTLD_DI_LINKMAP, &p); | |
139 | if (ret != -1 && p != NULL && p->l_addr != 0) { | |
97c7c238 MD |
140 | lttng_ust_dl_dlopen((void *) p->l_addr, |
141 | p->l_name, | |
171fcc6f | 142 | LTTNG_UST_CALLER_IP()); |
8e2aed3f | 143 | } |
b13d93c2 | 144 | } |
97c7c238 | 145 | lttng_ust_dl_update(LTTNG_UST_CALLER_IP()); |
b13d93c2 PW |
146 | return handle; |
147 | } | |
148 | ||
149 | int dlclose(void *handle) | |
150 | { | |
97c7c238 MD |
151 | int ret; |
152 | ||
e7953e6e | 153 | if (__tracepoint_ptrs_registered) { |
b13d93c2 | 154 | struct link_map *p = NULL; |
8e2aed3f AB |
155 | |
156 | ret = dlinfo(handle, RTLD_DI_LINKMAP, &p); | |
157 | if (ret != -1 && p != NULL && p->l_addr != 0) { | |
158 | tracepoint(lttng_ust_dl, dlclose, | |
171fcc6f | 159 | LTTNG_UST_CALLER_IP(), |
8e2aed3f AB |
160 | (void *) p->l_addr); |
161 | } | |
b13d93c2 | 162 | } |
97c7c238 MD |
163 | ret = _lttng_ust_dl_libc_dlclose(handle); |
164 | lttng_ust_dl_update(LTTNG_UST_CALLER_IP()); | |
165 | return ret; | |
b13d93c2 | 166 | } |