sewardj | e663cb9 | 2002-04-12 10:26:32 +0000 | [diff] [blame^] | 1 | |
| 2 | /* This is a replacement for the standard libpthread.so. It is loaded |
| 3 | as part of the client's image (if required) and directs pthread |
| 4 | calls through to Valgrind's request mechanism. |
| 5 | |
| 6 | A couple of caveats. |
| 7 | |
| 8 | 1. Since it's a binary-compatible replacement for an existing library, |
| 9 | we must take care to used exactly the same data layouts, etc, as |
| 10 | the standard pthread.so does. |
| 11 | |
| 12 | 2. Since this runs as part of the client, there are no specific |
| 13 | restrictions on what headers etc we can include, so long as |
| 14 | this libpthread.so does not end up having dependencies on .so's |
| 15 | which the real one doesn't. |
| 16 | |
| 17 | Later ... it appears we cannot call file-related stuff in libc here, |
| 18 | perhaps fair enough. Be careful what you call from here. Even exit() |
| 19 | doesn't work (gives infinite recursion and then stack overflow); hence |
| 20 | myexit(). Also fprintf doesn't seem safe. |
| 21 | */ |
| 22 | |
| 23 | #include "valgrind.h" /* For the request-passing mechanism */ |
| 24 | #include "vg_include.h" /* For the VG_USERREQ__* constants */ |
| 25 | |
| 26 | #include <pthread.h> |
| 27 | #include <unistd.h> |
| 28 | #include <string.h> |
| 29 | |
| 30 | |
| 31 | /* --------------------------------------------------------------------- |
| 32 | Helpers. We have to be pretty self-sufficient. |
| 33 | ------------------------------------------------------------------ */ |
| 34 | |
| 35 | static |
| 36 | void myexit ( int arg ) |
| 37 | { |
| 38 | int __res; |
| 39 | __asm__ volatile ("movl %%ecx, %%ebx ; int $0x80" |
| 40 | : "=a" (__res) |
| 41 | : "0" (__NR_exit), |
| 42 | "c" (arg) ); |
| 43 | /* We don't bother to mention the fact that this asm trashes %ebx, |
| 44 | since it won't return. If you ever do let it return ... fix |
| 45 | this! */ |
| 46 | } |
| 47 | |
| 48 | |
| 49 | /* Give up without using printf etc, since they seem to give |
| 50 | segfaults. */ |
| 51 | static |
| 52 | void ensure_valgrind ( char* caller ) |
| 53 | { |
| 54 | char* str; |
| 55 | int is_valgrind = RUNNING_ON_VALGRIND; |
| 56 | if (!is_valgrind) { |
| 57 | str = "\nvalgrind-ed process: vg_libpthread.so: " |
| 58 | "pthread call when\n"; |
| 59 | write(2, str, strlen(str)); |
| 60 | str = "not running on valgrind; aborting! " |
| 61 | "This is probably a bug in\n"; |
| 62 | write(2, str, strlen(str)); |
| 63 | str = "valgrind. Please report it to me at: " |
| 64 | "jseward@acm.org. Thanks.\n"; |
| 65 | write(2, str, strlen(str)); |
| 66 | str = "unexpectedly called function is: "; |
| 67 | write(2, str, strlen(str)); |
| 68 | write(2, caller, strlen(caller)); |
| 69 | str = "\n\n"; |
| 70 | write(2, str, strlen(str)); |
| 71 | myexit(1); |
| 72 | } |
| 73 | } |
| 74 | |
| 75 | |
| 76 | static |
| 77 | void barf ( char* str ) |
| 78 | { |
| 79 | char buf[100]; |
| 80 | buf[0] = 0; |
| 81 | strcat(buf, "\nvg_libpthread.so: "); |
| 82 | strcat(buf, str); |
| 83 | strcat(buf, "\n\n"); |
| 84 | write(2, buf, strlen(buf)); |
| 85 | myexit(1); |
| 86 | } |
| 87 | |
| 88 | |
| 89 | |
| 90 | /* --------------------------------------------------------------------- |
| 91 | Pass pthread_ calls to Valgrind's request mechanism. |
| 92 | ------------------------------------------------------------------ */ |
| 93 | |
| 94 | int |
| 95 | pthread_create (pthread_t *__restrict __thread, |
| 96 | __const pthread_attr_t *__restrict __attr, |
| 97 | void *(*__start_routine) (void *), |
| 98 | void *__restrict __arg) |
| 99 | { |
| 100 | int res; |
| 101 | ensure_valgrind("pthread_create"); |
| 102 | VALGRIND_MAGIC_SEQUENCE(res, 0 /* default */, |
| 103 | VG_USERREQ__PTHREAD_CREATE, |
| 104 | __thread, __attr, __start_routine, __arg); |
| 105 | return res; |
| 106 | } |
| 107 | |
| 108 | |
| 109 | |
| 110 | int |
| 111 | pthread_join (pthread_t __th, void **__thread_return) |
| 112 | { |
| 113 | int res; |
| 114 | ensure_valgrind("pthread_join"); |
| 115 | VALGRIND_MAGIC_SEQUENCE(res, 0 /* default */, |
| 116 | VG_USERREQ__PTHREAD_JOIN, |
| 117 | __th, __thread_return, 0, 0); |
| 118 | return res; |
| 119 | } |
| 120 | |
| 121 | |
| 122 | /* What are these? Anybody know? I don't. */ |
| 123 | |
| 124 | void _pthread_cleanup_push_defer ( void ) |
| 125 | { |
| 126 | // char* str = "_pthread_cleanup_push_defer\n"; |
| 127 | // write(2, str, strlen(str)); |
| 128 | } |
| 129 | |
| 130 | void _pthread_cleanup_pop_restore ( void ) |
| 131 | { |
| 132 | // char* str = "_pthread_cleanup_pop_restore\n"; |
| 133 | // write(2, str, strlen(str)); |
| 134 | } |
| 135 | |
| 136 | |
| 137 | static int thread_specific_errno[VG_N_THREADS]; |
| 138 | |
| 139 | int* __errno_location ( void ) |
| 140 | { |
| 141 | int tid; |
| 142 | ensure_valgrind("__errno_location"); |
| 143 | VALGRIND_MAGIC_SEQUENCE(tid, 0 /* default */, |
| 144 | VG_USERREQ__PTHREAD_GET_THREADID, |
| 145 | 0, 0, 0, 0); |
| 146 | /* 'cos I'm paranoid ... */ |
| 147 | if (tid < 0 || tid >= VG_N_THREADS) |
| 148 | barf("__errno_location: invalid ThreadId"); |
| 149 | return & thread_specific_errno[tid]; |
| 150 | } |
| 151 | |
| 152 | |
| 153 | int pthread_mutexattr_init(pthread_mutexattr_t *attr) |
| 154 | { |
| 155 | char* str = "pthread_mutexattr_init\n"; |
| 156 | write(2, str, strlen(str)); |
| 157 | return 0; |
| 158 | } |
| 159 | |
| 160 | int pthread_mutex_init(pthread_mutex_t *mutex, |
| 161 | const pthread_mutexattr_t *mutexattr) |
| 162 | { |
| 163 | int res; |
| 164 | char* str = "pthread_mutex_init\n"; |
| 165 | write(2, str, strlen(str)); |
| 166 | ensure_valgrind("pthread_mutex_init"); |
| 167 | VALGRIND_MAGIC_SEQUENCE(res, 0 /* default */, |
| 168 | VG_USERREQ__PTHREAD_MUTEX_INIT, |
| 169 | mutex, mutexattr, 0, 0); |
| 170 | return res; |
| 171 | } |
| 172 | |
| 173 | int pthread_mutexattr_destroy(pthread_mutexattr_t *attr) |
| 174 | { |
| 175 | char* str = "pthread_mutexattr_destroy\n"; |
| 176 | write(2, str, strlen(str)); |
| 177 | return 0; |
| 178 | } |
| 179 | |
| 180 | int pthread_mutex_lock(pthread_mutex_t *mutex) |
| 181 | { |
| 182 | int res; |
| 183 | if (!(RUNNING_ON_VALGRIND)) { |
| 184 | char* str = "pthread_mutex_lock-NOT-INSIDE-VALGRIND\n"; |
| 185 | write(2, str, strlen(str)); |
| 186 | return 0; |
| 187 | } else { |
| 188 | VALGRIND_MAGIC_SEQUENCE(res, 0 /* default */, |
| 189 | VG_USERREQ__PTHREAD_MUTEX_LOCK, |
| 190 | mutex, 0, 0, 0); |
| 191 | return res; |
| 192 | } |
| 193 | } |
| 194 | |
| 195 | int pthread_mutex_unlock(pthread_mutex_t *mutex) |
| 196 | { |
| 197 | int res; |
| 198 | if (!(RUNNING_ON_VALGRIND)) { |
| 199 | char* str = "pthread_mutex_unlock-NOT-INSIDE-VALGRIND\n"; |
| 200 | write(2, str, strlen(str)); |
| 201 | return 0; |
| 202 | } else { |
| 203 | VALGRIND_MAGIC_SEQUENCE(res, 0 /* default */, |
| 204 | VG_USERREQ__PTHREAD_MUTEX_UNLOCK, |
| 205 | mutex, 0, 0, 0); |
| 206 | return res; |
| 207 | } |
| 208 | } |
| 209 | |
| 210 | pthread_t pthread_self(void) |
| 211 | { |
| 212 | int tid; |
| 213 | ensure_valgrind("pthread_self"); |
| 214 | VALGRIND_MAGIC_SEQUENCE(tid, 0 /* default */, |
| 215 | VG_USERREQ__PTHREAD_GET_THREADID, |
| 216 | 0, 0, 0, 0); |
| 217 | if (tid < 0 || tid >= VG_N_THREADS) |
| 218 | barf("pthread_self: invalid ThreadId"); |
| 219 | return tid; |
| 220 | } |
| 221 | |
| 222 | int pthread_mutex_destroy(pthread_mutex_t *mutex) |
| 223 | { |
| 224 | int res; |
| 225 | if (!(RUNNING_ON_VALGRIND)) { |
| 226 | char* str = "pthread_mutex_destroy-NOT-INSIDE-VALGRIND\n"; |
| 227 | write(2, str, strlen(str)); |
| 228 | return 0; |
| 229 | } else { |
| 230 | VALGRIND_MAGIC_SEQUENCE(res, 0 /* default */, |
| 231 | VG_USERREQ__PTHREAD_MUTEX_DESTROY, |
| 232 | mutex, 0, 0, 0); |
| 233 | } |
| 234 | return res; |
| 235 | } |
| 236 | |
| 237 | |
| 238 | int pthread_setcanceltype(int type, int *oldtype) |
| 239 | { |
| 240 | char* str = "pthread_setcanceltype\n"; |
| 241 | write(2, str, strlen(str)); |
| 242 | return 0; |
| 243 | } |
| 244 | |
| 245 | |
| 246 | int pthread_cancel(pthread_t thread) |
| 247 | { |
| 248 | int res; |
| 249 | ensure_valgrind("pthread_cancel"); |
| 250 | VALGRIND_MAGIC_SEQUENCE(res, 0 /* default */, |
| 251 | VG_USERREQ__PTHREAD_CANCEL, |
| 252 | thread, 0, 0, 0); |
| 253 | return res; |
| 254 | } |
| 255 | |
| 256 | |
| 257 | /* --------------------------------------------------------------------- |
| 258 | These are here (I think) because they are deemed cancellation |
| 259 | points by POSIX. For the moment we'll simply pass the call along |
| 260 | to the corresponding thread-unaware (?) libc routine. |
| 261 | ------------------------------------------------------------------ */ |
| 262 | |
| 263 | #include <stdio.h> |
| 264 | #include <stdlib.h> |
| 265 | #include <signal.h> |
| 266 | #include <errno.h> |
| 267 | #include <sys/types.h> |
| 268 | #include <sys/socket.h> |
| 269 | |
| 270 | extern |
| 271 | int __libc_sigaction |
| 272 | (int signum, |
| 273 | const struct sigaction *act, |
| 274 | struct sigaction *oldact); |
| 275 | int sigaction(int signum, |
| 276 | const struct sigaction *act, |
| 277 | struct sigaction *oldact) |
| 278 | { |
| 279 | // char* str = "sigaction\n"; |
| 280 | // write(2, str, strlen(str)); |
| 281 | return __libc_sigaction(signum, act, oldact); |
| 282 | } |
| 283 | |
| 284 | |
| 285 | extern |
| 286 | int __libc_connect(int sockfd, |
| 287 | const struct sockaddr *serv_addr, |
| 288 | socklen_t addrlen); |
| 289 | int connect(int sockfd, |
| 290 | const struct sockaddr *serv_addr, |
| 291 | socklen_t addrlen) |
| 292 | { |
| 293 | // char* str = "connect\n"; |
| 294 | // write(2, str, strlen(str)); |
| 295 | return __libc_connect(sockfd, serv_addr, addrlen); |
| 296 | } |
| 297 | |
| 298 | |
| 299 | extern |
| 300 | int __libc_fcntl(int fd, int cmd, long arg); |
| 301 | int fcntl(int fd, int cmd, long arg) |
| 302 | { |
| 303 | // char* str = "fcntl\n"; |
| 304 | // write(2, str, strlen(str)); |
| 305 | return __libc_fcntl(fd, cmd, arg); |
| 306 | } |
| 307 | |
| 308 | |
| 309 | extern |
| 310 | ssize_t __libc_write(int fd, const void *buf, size_t count); |
| 311 | ssize_t write(int fd, const void *buf, size_t count) |
| 312 | { |
| 313 | // char* str = "write\n"; |
| 314 | // write(2, str, strlen(str)); |
| 315 | return __libc_write(fd, buf, count); |
| 316 | } |
| 317 | |
| 318 | |
| 319 | extern |
| 320 | ssize_t __libc_read(int fd, void *buf, size_t count); |
| 321 | ssize_t read(int fd, void *buf, size_t count) |
| 322 | { |
| 323 | // char* str = "read\n"; |
| 324 | // write(2, str, strlen(str)); |
| 325 | return __libc_read(fd, buf, count); |
| 326 | } |
| 327 | |
| 328 | |
| 329 | extern |
| 330 | int __libc_open(const char *pathname, int flags); |
| 331 | int open(const char *pathname, int flags) |
| 332 | { |
| 333 | // char* str = "open\n"; |
| 334 | // write(2, str, strlen(str)); |
| 335 | return __libc_open(pathname, flags); |
| 336 | } |
| 337 | |
| 338 | |
| 339 | extern |
| 340 | int __libc_close(int fd); |
| 341 | int close(int fd) |
| 342 | { |
| 343 | // char* str = "open\n"; |
| 344 | // write(2, str, strlen(str)); |
| 345 | return __libc_close(fd); |
| 346 | } |
| 347 | |
| 348 | |
| 349 | extern |
| 350 | int __libc_accept(int s, struct sockaddr *addr, socklen_t *addrlen); |
| 351 | int accept(int s, struct sockaddr *addr, socklen_t *addrlen) |
| 352 | { |
| 353 | // char* str = "accept\n"; |
| 354 | // write(2, str, strlen(str)); |
| 355 | return __libc_accept(s, addr, addrlen); |
| 356 | } |
| 357 | |
| 358 | |
| 359 | extern |
| 360 | pid_t __libc_fork(void); |
| 361 | pid_t fork(void) |
| 362 | { |
| 363 | // char* str = "fork\n"; |
| 364 | // write(2, str, strlen(str)); |
| 365 | return __libc_fork(); |
| 366 | } |
| 367 | |
| 368 | |
| 369 | extern |
| 370 | pid_t __libc_waitpid(pid_t pid, int *status, int options); |
| 371 | pid_t waitpid(pid_t pid, int *status, int options) |
| 372 | { |
| 373 | // char* str = "waitpid\n"; |
| 374 | // write(2, str, strlen(str)); |
| 375 | return __libc_waitpid(pid, status, options); |
| 376 | } |
| 377 | |
| 378 | |
| 379 | extern |
| 380 | int __libc_nanosleep(const struct timespec *req, struct timespec *rem); |
| 381 | int nanosleep(const struct timespec *req, struct timespec *rem) |
| 382 | { |
| 383 | return __libc_nanosleep(req, rem); |
| 384 | } |
| 385 | |
| 386 | extern |
| 387 | int __libc_fsync(int fd); |
| 388 | int fsync(int fd) |
| 389 | { |
| 390 | return __libc_fsync(fd); |
| 391 | } |
| 392 | |
| 393 | /* I've no idea what these are, but they get called quite a lot. |
| 394 | Anybody know? */ |
| 395 | |
| 396 | #undef _IO_flockfile |
| 397 | void _IO_flockfile ( _IO_FILE * file ) |
| 398 | { |
| 399 | // char* str = "_IO_flockfile\n"; |
| 400 | // write(2, str, strlen(str)); |
| 401 | // barf("_IO_flockfile"); |
| 402 | } |
| 403 | |
| 404 | #undef _IO_funlockfile |
| 405 | void _IO_funlockfile ( _IO_FILE * file ) |
| 406 | { |
| 407 | // char* str = "_IO_funlockfile\n"; |
| 408 | // write(2, str, strlen(str)); |
| 409 | //barf("_IO_funlockfile"); |
| 410 | } |
| 411 | |