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b13d93c2 PW |
1 | /* |
2 | * Copyright (C) 2013 Paul Woegerer <paul_woegerer@mentor.com> | |
3 | * | |
4 | * This library is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU Lesser General Public | |
6 | * License as published by the Free Software Foundation; either | |
7 | * version 2.1 of the License, or (at your option) any later version. | |
8 | * | |
9 | * This library is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
12 | * Lesser General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU Lesser General Public | |
15 | * License along with this library; if not, write to the Free Software | |
16 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
17 | */ | |
18 | ||
19 | #define _GNU_SOURCE | |
20 | #include <dlfcn.h> | |
21 | #include <link.h> | |
22 | ||
23 | #include <sys/types.h> | |
24 | #include <sys/stat.h> | |
b13d93c2 PW |
25 | #include <unistd.h> |
26 | #include <limits.h> | |
27 | #include <stdlib.h> | |
28 | #include <errno.h> | |
29 | #include <stdint.h> | |
30 | #include <stddef.h> | |
31 | #include <stdio.h> | |
b13d93c2 | 32 | |
9e166115 MD |
33 | #include <usterr-signal-safe.h> |
34 | #include "lttng-tracer-core.h" | |
13436238 PW |
35 | #include "lttng-ust-baddr.h" |
36 | ||
b13d93c2 | 37 | #define TRACEPOINT_DEFINE |
95c25348 | 38 | #include "ust_baddr_statedump.h" |
b13d93c2 | 39 | |
37dddb65 MD |
40 | static |
41 | int extract_soinfo_events(struct dl_phdr_info *info, size_t size, void *data) | |
95c25348 PW |
42 | { |
43 | int j; | |
44 | int num_loadable_segment = 0; | |
37dddb65 MD |
45 | void *owner = data; |
46 | struct cds_list_head *sessionsp; | |
47 | ||
95c25348 PW |
48 | for (j = 0; j < info->dlpi_phnum; j++) { |
49 | char resolved_path[PATH_MAX]; | |
50 | struct stat sostat; | |
51 | void *base_addr_ptr; | |
37dddb65 | 52 | struct lttng_session *session; |
95c25348 PW |
53 | |
54 | if (info->dlpi_phdr[j].p_type != PT_LOAD) | |
55 | continue; | |
56 | ||
57 | /* Calculate virtual memory address of the loadable segment */ | |
58 | base_addr_ptr = (void *) info->dlpi_addr | |
59 | + info->dlpi_phdr[j].p_vaddr; | |
60 | ||
61 | num_loadable_segment += 1; | |
62 | if ((info->dlpi_name == NULL || info->dlpi_name[0] == 0) | |
63 | && num_loadable_segment == 1) { | |
64 | /* | |
65 | * If the iterated element is the executable itself we | |
66 | * have to use Dl_info to determine its full path | |
67 | */ | |
68 | Dl_info dl_info = { 0 }; | |
69 | if (!dladdr(base_addr_ptr, &dl_info)) | |
70 | return 0; | |
71 | if (!realpath(dl_info.dli_fname, resolved_path)) | |
72 | return 0; | |
73 | } else { | |
74 | /* | |
75 | * For regular dl_phdr_info entries we have to check if | |
76 | * the path to the shared object really exists | |
77 | */ | |
78 | if (!realpath(info->dlpi_name, resolved_path)) { | |
79 | /* Found vDSO, put the 'path' into brackets */ | |
80 | snprintf(resolved_path, PATH_MAX - 1, "[%s]", | |
81 | info->dlpi_name); | |
82 | } | |
83 | } | |
84 | ||
85 | if (stat(resolved_path, &sostat)) { | |
86 | sostat.st_size = 0; | |
87 | sostat.st_mtime = -1; | |
88 | } | |
89 | ||
37dddb65 MD |
90 | /* |
91 | * UST lock needs to be nested within dynamic loader | |
92 | * lock. | |
93 | */ | |
94 | ust_lock(); | |
76b82fc0 | 95 | sessionsp = _lttng_get_sessions(); |
37dddb65 MD |
96 | cds_list_for_each_entry(session, sessionsp, node) { |
97 | if (session->owner != owner) | |
98 | continue; | |
99 | if (!session->statedump_pending) | |
100 | continue; | |
101 | tracepoint(ust_baddr_statedump, soinfo, | |
102 | session, base_addr_ptr, | |
103 | resolved_path, sostat.st_size, | |
104 | sostat.st_mtime); | |
105 | } | |
106 | ust_unlock(); | |
95c25348 PW |
107 | |
108 | /* | |
109 | * We are only interested in the base address (lowest virtual | |
110 | * address associated with the memory image), skip the rest | |
111 | */ | |
112 | break; | |
113 | } | |
114 | return 0; | |
115 | } | |
116 | ||
37dddb65 | 117 | int lttng_ust_baddr_statedump(void *owner) |
95c25348 | 118 | { |
ca7643d6 PW |
119 | if (getenv("LTTNG_UST_WITHOUT_BADDR_STATEDUMP")) |
120 | return 0; | |
95c25348 PW |
121 | /* |
122 | * Iterate through the list of currently loaded shared objects and | |
37dddb65 MD |
123 | * generate events for loadable segments using |
124 | * extract_soinfo_events. | |
95c25348 | 125 | */ |
37dddb65 | 126 | dl_iterate_phdr(extract_soinfo_events, owner); |
95c25348 PW |
127 | return 0; |
128 | } |