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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> | |
32 | #include "usterr.h" | |
33 | ||
13436238 PW |
34 | #include "lttng-ust-baddr.h" |
35 | ||
b13d93c2 | 36 | #define TRACEPOINT_DEFINE |
95c25348 | 37 | #include "ust_baddr_statedump.h" |
b13d93c2 | 38 | |
95c25348 PW |
39 | static int |
40 | extract_soinfo_events(struct dl_phdr_info *info, size_t size, void *data) | |
41 | { | |
42 | int j; | |
43 | int num_loadable_segment = 0; | |
44 | ||
45 | for (j = 0; j < info->dlpi_phnum; j++) { | |
46 | char resolved_path[PATH_MAX]; | |
47 | struct stat sostat; | |
48 | void *base_addr_ptr; | |
49 | ||
50 | if (info->dlpi_phdr[j].p_type != PT_LOAD) | |
51 | continue; | |
52 | ||
53 | /* Calculate virtual memory address of the loadable segment */ | |
54 | base_addr_ptr = (void *) info->dlpi_addr | |
55 | + info->dlpi_phdr[j].p_vaddr; | |
56 | ||
57 | num_loadable_segment += 1; | |
58 | if ((info->dlpi_name == NULL || info->dlpi_name[0] == 0) | |
59 | && num_loadable_segment == 1) { | |
60 | /* | |
61 | * If the iterated element is the executable itself we | |
62 | * have to use Dl_info to determine its full path | |
63 | */ | |
64 | Dl_info dl_info = { 0 }; | |
65 | if (!dladdr(base_addr_ptr, &dl_info)) | |
66 | return 0; | |
67 | if (!realpath(dl_info.dli_fname, resolved_path)) | |
68 | return 0; | |
69 | } else { | |
70 | /* | |
71 | * For regular dl_phdr_info entries we have to check if | |
72 | * the path to the shared object really exists | |
73 | */ | |
74 | if (!realpath(info->dlpi_name, resolved_path)) { | |
75 | /* Found vDSO, put the 'path' into brackets */ | |
76 | snprintf(resolved_path, PATH_MAX - 1, "[%s]", | |
77 | info->dlpi_name); | |
78 | } | |
79 | } | |
80 | ||
81 | if (stat(resolved_path, &sostat)) { | |
82 | sostat.st_size = 0; | |
83 | sostat.st_mtime = -1; | |
84 | } | |
85 | ||
86 | tracepoint(ust_baddr_statedump, soinfo, | |
87 | (struct lttng_session *) data, base_addr_ptr, | |
88 | resolved_path, sostat.st_size, sostat.st_mtime); | |
89 | ||
90 | /* | |
91 | * We are only interested in the base address (lowest virtual | |
92 | * address associated with the memory image), skip the rest | |
93 | */ | |
94 | break; | |
95 | } | |
96 | return 0; | |
97 | } | |
98 | ||
99 | int | |
100 | lttng_ust_baddr_statedump(struct lttng_session *session) | |
101 | { | |
ca7643d6 PW |
102 | if (getenv("LTTNG_UST_WITHOUT_BADDR_STATEDUMP")) |
103 | return 0; | |
95c25348 PW |
104 | /* |
105 | * Iterate through the list of currently loaded shared objects and | |
106 | * generate events for loadable segments using extract_soinfo_events | |
107 | */ | |
108 | dl_iterate_phdr(extract_soinfo_events, session); | |
109 | return 0; | |
110 | } |