2 /*--------------------------------------------------------------------*/
3 /*--- Launching valgrind m_launcher.c ---*/
4 /*--------------------------------------------------------------------*/
7 This file is part of Valgrind, a dynamic binary instrumentation
10 Copyright (C) 2000-2010 Julian Seward
13 This program is free software; you can redistribute it and/or
14 modify it under the terms of the GNU General Public License as
15 published by the Free Software Foundation; either version 2 of the
16 License, or (at your option) any later version.
18 This program is distributed in the hope that it will be useful, but
19 WITHOUT ANY WARRANTY; without even the implied warranty of
20 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
21 General Public License for more details.
23 You should have received a copy of the GNU General Public License
24 along with this program; if not, write to the Free Software
25 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
28 The GNU General Public License is contained in the file COPYING.
31 /* Note: this is a "normal" program and not part of Valgrind proper,
32 and so it doesn't have to conform to Valgrind's arcane rules on
33 no-glibc-usage etc. */
35 /* Include valgrind headers before system headers to avoid problems
36 with the system headers #defining things which are used as names
37 of structure members in vki headers. */
39 #include "pub_core_debuglog.h"
40 #include "pub_core_vki.h" // Avoids warnings from
41 // pub_core_libcfile.h
42 #include "pub_core_libcproc.h" // For VALGRIND_LIB, VALGRIND_LAUNCHER
43 #include "pub_core_ume.h"
60 #define PATH_MAX 4096 /* POSIX refers to this a lot but I dunno
61 where it is defined */
64 #define EM_X86_64 62 // elf.h doesn't define this on some older systems
67 /* Report fatal errors */
68 __attribute__((noreturn))
69 static void barf ( const char *format, ... )
73 va_start(vargs, format);
74 fprintf(stderr, "valgrind: Cannot continue: ");
75 vfprintf(stderr, format, vargs);
76 fprintf(stderr, "\n");
84 /* Search the path for the client program */
85 static const char *find_client(const char *clientname)
87 static char fullname[PATH_MAX];
88 const char *path = getenv("PATH");
93 if ((colon = strchr(path, ':')) == NULL)
95 strcpy(fullname, path);
100 memcpy(fullname, path, colon - path);
101 fullname[colon - path] = '\0';
105 strcat(fullname, "/");
106 strcat(fullname, clientname);
108 if (access(fullname, R_OK|X_OK) == 0)
115 /* Examine the client and work out which platform it is for */
116 static const char *select_platform(const char *clientname)
119 uint8_t header[4096];
121 const char *platform = NULL;
123 VG_(debugLog)(2, "launcher", "selecting platform for '%s'\n", clientname);
125 if (strchr(clientname, '/') == NULL)
126 clientname = find_client(clientname);
128 VG_(debugLog)(2, "launcher", "selecting platform for '%s'\n", clientname);
130 if ((fd = open(clientname, O_RDONLY)) < 0)
132 // barf("open(%s): %s", clientname, strerror(errno));
134 VG_(debugLog)(2, "launcher", "opened '%s'\n", clientname);
136 n_bytes = read(fd, header, sizeof(header));
142 VG_(debugLog)(2, "launcher", "read %ld bytes from '%s'\n",
143 (long int)n_bytes, clientname);
145 if (header[0] == '#' && header[1] == '!') {
147 char *interp = (char *)header + 2;
151 if (i == n_bytes) return NULL;
152 if (' ' != header[i] && '\t' != header[i]) break;
156 // Get the interpreter name.
159 if (i == n_bytes) break;
160 if (isspace(header[i])) break;
163 if (i == n_bytes) return NULL;
166 platform = select_platform(interp);
168 } else if (n_bytes >= SELFMAG && memcmp(header, ELFMAG, SELFMAG) == 0) {
170 if (n_bytes >= sizeof(Elf32_Ehdr) && header[EI_CLASS] == ELFCLASS32) {
171 const Elf32_Ehdr *ehdr = (Elf32_Ehdr *)header;
173 if (header[EI_DATA] == ELFDATA2LSB) {
174 if (ehdr->e_machine == EM_386 &&
175 (ehdr->e_ident[EI_OSABI] == ELFOSABI_SYSV ||
176 ehdr->e_ident[EI_OSABI] == ELFOSABI_LINUX)) {
177 platform = "x86-linux";
180 if (ehdr->e_machine == EM_ARM &&
181 (ehdr->e_ident[EI_OSABI] == ELFOSABI_SYSV ||
182 ehdr->e_ident[EI_OSABI] == ELFOSABI_LINUX)) {
183 platform = "arm-linux";
186 else if (header[EI_DATA] == ELFDATA2MSB) {
187 if (ehdr->e_machine == EM_PPC &&
188 (ehdr->e_ident[EI_OSABI] == ELFOSABI_SYSV ||
189 ehdr->e_ident[EI_OSABI] == ELFOSABI_LINUX)) {
190 platform = "ppc32-linux";
194 } else if (n_bytes >= sizeof(Elf64_Ehdr) && header[EI_CLASS] == ELFCLASS64) {
195 const Elf64_Ehdr *ehdr = (Elf64_Ehdr *)header;
197 if (header[EI_DATA] == ELFDATA2LSB) {
198 if (ehdr->e_machine == EM_X86_64 &&
199 (ehdr->e_ident[EI_OSABI] == ELFOSABI_SYSV ||
200 ehdr->e_ident[EI_OSABI] == ELFOSABI_LINUX)) {
201 platform = "amd64-linux";
203 } else if (header[EI_DATA] == ELFDATA2MSB) {
204 if (ehdr->e_machine == EM_PPC64 &&
205 (ehdr->e_ident[EI_OSABI] == ELFOSABI_SYSV ||
206 ehdr->e_ident[EI_OSABI] == ELFOSABI_LINUX)) {
207 platform = "ppc64-linux";
208 } else if (ehdr->e_machine == EM_S390 &&
209 (ehdr->e_ident[EI_OSABI] == ELFOSABI_SYSV ||
210 ehdr->e_ident[EI_OSABI] == ELFOSABI_LINUX)) {
211 platform = "s390x-linux";
217 VG_(debugLog)(2, "launcher", "selected platform '%s'\n",
218 platform ? platform : "unknown");
223 /* Where we expect to find all our aux files */
224 static const char *valgrind_lib = VG_LIBDIR;
226 int main(int argc, char** argv, char** envp)
228 int i, j, loglevel, r;
229 const char *toolname = NULL;
230 const char *clientname = NULL;
231 const char *platform;
232 const char *default_platform;
235 char launcher_name[PATH_MAX+1];
239 /* Start the debugging-log system ASAP. First find out how many
240 "-d"s were specified. This is a pre-scan of the command line.
241 At the same time, look for the tool name. */
243 for (i = 1; i < argc; i++) {
244 if (argv[i][0] != '-') {
245 clientname = argv[i];
248 if (0 == strcmp(argv[i], "--")) {
250 clientname = argv[i+1];
253 if (0 == strcmp(argv[i], "-d"))
255 if (0 == strncmp(argv[i], "--tool=", 7))
256 toolname = argv[i] + 7;
259 /* ... and start the debug logger. Now we can safely emit logging
260 messages all through startup. */
261 VG_(debugLog_startup)(loglevel, "Stage 1");
263 /* Make sure we know which tool we're using */
265 VG_(debugLog)(1, "launcher", "tool '%s' requested\n", toolname);
267 VG_(debugLog)(1, "launcher",
268 "no tool requested, defaulting to 'memcheck'\n");
269 toolname = "memcheck";
272 /* Select a platform to use if we can't decide that by looking at
273 the executable (eg because it's a shell script). Note that the
274 default_platform is not necessarily either the primary or
275 secondary build target. Instead it's chosen to maximise the
276 chances that /bin/sh will work on it. Hence for a primary
277 target of ppc64-linux we still choose ppc32-linux as the default
278 target, because on most ppc64-linux setups, the basic /bin,
279 /usr/bin, etc, stuff is built in 32-bit mode, not 64-bit
281 if ((0==strcmp(VG_PLATFORM,"x86-linux")) ||
282 (0==strcmp(VG_PLATFORM,"amd64-linux")) ||
283 (0==strcmp(VG_PLATFORM,"ppc32-linux")) ||
284 (0==strcmp(VG_PLATFORM,"ppc64-linux")) ||
285 (0==strcmp(VG_PLATFORM,"arm-linux")) ||
286 (0==strcmp(VG_PLATFORM,"s390x-linux")))
287 default_platform = VG_PLATFORM;
289 barf("Unknown VG_PLATFORM '%s'", VG_PLATFORM);
291 /* Work out what platform to use, or use the default platform if
293 if (clientname == NULL) {
294 VG_(debugLog)(1, "launcher",
295 "no client specified, defaulting platform to '%s'\n",
297 platform = default_platform;
298 } else if ((platform = select_platform(clientname)) != NULL) {
299 VG_(debugLog)(1, "launcher", "selected platform '%s'\n", platform);
301 VG_(debugLog)(1, "launcher",
302 "no platform detected, defaulting platform to '%s'\n",
304 platform = default_platform;
307 /* Figure out the name of this executable (viz, the launcher), so
308 we can tell stage2. stage2 will use the name for recursive
309 invocations of valgrind on child processes. */
310 memset(launcher_name, 0, PATH_MAX+1);
311 r = readlink("/proc/self/exe", launcher_name, PATH_MAX);
313 /* If /proc/self/exe can't be followed, don't give up. Instead
314 continue with an empty string for VALGRIND_LAUNCHER. In the
315 sys_execve wrapper, this is tested, and if found to be empty,
317 fprintf(stderr, "valgrind: warning (non-fatal): "
318 "readlink(\"/proc/self/exe\") failed.\n");
319 fprintf(stderr, "valgrind: continuing, however --trace-children=yes "
323 /* tediously augment the env: VALGRIND_LAUNCHER=launcher_name */
324 new_line = malloc(strlen(VALGRIND_LAUNCHER) + 1
325 + strlen(launcher_name) + 1);
326 if (new_line == NULL)
327 barf("malloc of new_line failed.");
328 strcpy(new_line, VALGRIND_LAUNCHER);
329 strcat(new_line, "=");
330 strcat(new_line, launcher_name);
332 for (j = 0; envp[j]; j++)
334 new_env = malloc((j+2) * sizeof(char*));
336 barf("malloc of new_env failed.");
337 for (i = 0; i < j; i++)
338 new_env[i] = envp[i];
339 new_env[i++] = new_line;
343 /* Establish the correct VALGRIND_LIB. */
344 cp = getenv(VALGRIND_LIB);
349 /* Build the stage2 invocation, and execve it. Bye! */
350 toolfile = malloc(strlen(valgrind_lib) + strlen(toolname) + strlen(platform) + 3);
351 if (toolfile == NULL)
352 barf("malloc of toolfile failed.");
353 sprintf(toolfile, "%s/%s-%s", valgrind_lib, toolname, platform);
355 VG_(debugLog)(1, "launcher", "launching %s\n", toolfile);
357 execve(toolfile, argv, new_env);
359 fprintf(stderr, "valgrind: failed to start tool '%s' for platform '%s': %s\n",
360 toolname, platform, strerror(errno));