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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> | |
25 | #include <sys/stat.h> | |
26 | #include <unistd.h> | |
27 | #include <limits.h> | |
28 | #include <stdlib.h> | |
29 | #include <errno.h> | |
30 | #include <stdint.h> | |
31 | #include <stddef.h> | |
32 | #include <stdio.h> | |
33 | #include "usterr.h" | |
34 | ||
35 | #define TRACEPOINT_DEFINE | |
36 | #include "ust_baddr.h" | |
95c25348 | 37 | #include "ust_baddr_statedump.h" |
b13d93c2 PW |
38 | |
39 | int | |
40 | lttng_ust_push_baddr(void *so_base, const char *so_name) | |
41 | { | |
42 | char resolved_path[PATH_MAX]; | |
43 | struct stat sostat; | |
44 | ||
45 | if (!realpath(so_name, resolved_path)) { | |
46 | ERR("could not resolve path '%s'", so_name); | |
47 | return 0; | |
48 | } | |
49 | ||
50 | if (stat(resolved_path, &sostat)) { | |
51 | ERR("could not access file status for %s", resolved_path); | |
52 | return 0; | |
53 | } | |
54 | ||
55 | tracepoint(ust_baddr, push, | |
56 | so_base, resolved_path, sostat.st_size, sostat.st_mtime); | |
57 | return 0; | |
58 | } | |
59 | ||
60 | int | |
61 | lttng_ust_pop_baddr(void *so_base) | |
62 | { | |
63 | tracepoint(ust_baddr, pop, so_base); | |
64 | return 0; | |
65 | } | |
95c25348 PW |
66 | |
67 | static int | |
68 | extract_soinfo_events(struct dl_phdr_info *info, size_t size, void *data) | |
69 | { | |
70 | int j; | |
71 | int num_loadable_segment = 0; | |
72 | ||
73 | for (j = 0; j < info->dlpi_phnum; j++) { | |
74 | char resolved_path[PATH_MAX]; | |
75 | struct stat sostat; | |
76 | void *base_addr_ptr; | |
77 | ||
78 | if (info->dlpi_phdr[j].p_type != PT_LOAD) | |
79 | continue; | |
80 | ||
81 | /* Calculate virtual memory address of the loadable segment */ | |
82 | base_addr_ptr = (void *) info->dlpi_addr | |
83 | + info->dlpi_phdr[j].p_vaddr; | |
84 | ||
85 | num_loadable_segment += 1; | |
86 | if ((info->dlpi_name == NULL || info->dlpi_name[0] == 0) | |
87 | && num_loadable_segment == 1) { | |
88 | /* | |
89 | * If the iterated element is the executable itself we | |
90 | * have to use Dl_info to determine its full path | |
91 | */ | |
92 | Dl_info dl_info = { 0 }; | |
93 | if (!dladdr(base_addr_ptr, &dl_info)) | |
94 | return 0; | |
95 | if (!realpath(dl_info.dli_fname, resolved_path)) | |
96 | return 0; | |
97 | } else { | |
98 | /* | |
99 | * For regular dl_phdr_info entries we have to check if | |
100 | * the path to the shared object really exists | |
101 | */ | |
102 | if (!realpath(info->dlpi_name, resolved_path)) { | |
103 | /* Found vDSO, put the 'path' into brackets */ | |
104 | snprintf(resolved_path, PATH_MAX - 1, "[%s]", | |
105 | info->dlpi_name); | |
106 | } | |
107 | } | |
108 | ||
109 | if (stat(resolved_path, &sostat)) { | |
110 | sostat.st_size = 0; | |
111 | sostat.st_mtime = -1; | |
112 | } | |
113 | ||
114 | tracepoint(ust_baddr_statedump, soinfo, | |
115 | (struct lttng_session *) data, base_addr_ptr, | |
116 | resolved_path, sostat.st_size, sostat.st_mtime); | |
117 | ||
118 | /* | |
119 | * We are only interested in the base address (lowest virtual | |
120 | * address associated with the memory image), skip the rest | |
121 | */ | |
122 | break; | |
123 | } | |
124 | return 0; | |
125 | } | |
126 | ||
127 | int | |
128 | lttng_ust_baddr_statedump(struct lttng_session *session) | |
129 | { | |
130 | /* | |
131 | * Iterate through the list of currently loaded shared objects and | |
132 | * generate events for loadable segments using extract_soinfo_events | |
133 | */ | |
134 | dl_iterate_phdr(extract_soinfo_events, session); | |
135 | return 0; | |
136 | } |