| Commit | Line | Data |
|---|
| a0d0e21e |
1 | /* dl_aix.xs |
| 2 | * |
| 3 | * Written: 8/31/94 by Wayne Scott (wscott@ichips.intel.com) |
| 4 | * |
| 5 | * All I did was take Jens-Uwe Mager's libdl emulation library for |
| 6 | * AIX and merged it with the dl_dlopen.xs file to create a dynamic library |
| 7 | * package that works for AIX. |
| 8 | * |
| 9 | * I did change all malloc's, free's, strdup's, calloc's to use the perl |
| 10 | * equilvant. I also removed some stuff we will not need. Call fini() |
| 11 | * on statup... It can probably be trimmed more. |
| 12 | */ |
| 13 | |
| 14 | /* |
| 15 | * @(#)dlfcn.c 1.5 revision of 93/02/14 20:14:17 |
| 16 | * This is an unpublished work copyright (c) 1992 Helios Software GmbH |
| 17 | * 3000 Hannover 1, Germany |
| 18 | */ |
| 19 | #include "EXTERN.h" |
| 20 | #include "perl.h" |
| 21 | #include "XSUB.h" |
| 22 | |
| 23 | #include <stdio.h> |
| 24 | #include <errno.h> |
| 25 | #include <string.h> |
| 26 | #include <stdlib.h> |
| 27 | #include <sys/types.h> |
| 28 | #include <sys/ldr.h> |
| 29 | #include <a.out.h> |
| 30 | #include <ldfcn.h> |
| 31 | |
| 32 | /* |
| 33 | * We simulate dlopen() et al. through a call to load. Because AIX has |
| 34 | * no call to find an exported symbol we read the loader section of the |
| 35 | * loaded module and build a list of exported symbols and their virtual |
| 36 | * address. |
| 37 | */ |
| 38 | |
| 39 | typedef struct { |
| 40 | char *name; /* the symbols's name */ |
| 41 | void *addr; /* its relocated virtual address */ |
| 42 | } Export, *ExportPtr; |
| 43 | |
| 44 | /* |
| 45 | * The void * handle returned from dlopen is actually a ModulePtr. |
| 46 | */ |
| 47 | typedef struct Module { |
| 48 | struct Module *next; |
| 49 | char *name; /* module name for refcounting */ |
| 50 | int refCnt; /* the number of references */ |
| 51 | void *entry; /* entry point from load */ |
| 52 | int nExports; /* the number of exports found */ |
| 53 | ExportPtr exports; /* the array of exports */ |
| 54 | } Module, *ModulePtr; |
| 55 | |
| 56 | /* |
| 57 | * We keep a list of all loaded modules to be able to call the fini |
| 58 | * handlers at atexit() time. |
| 59 | */ |
| 60 | static ModulePtr modList; |
| 61 | |
| 62 | /* |
| 63 | * The last error from one of the dl* routines is kept in static |
| 64 | * variables here. Each error is returned only once to the caller. |
| 65 | */ |
| 66 | static char errbuf[BUFSIZ]; |
| 67 | static int errvalid; |
| 68 | |
| 69 | static void caterr(char *); |
| 70 | static int readExports(ModulePtr); |
| 71 | static void terminate(void); |
| 72 | static void *findMain(void); |
| 73 | |
| 74 | |
| 75 | /* ARGSUSED */ |
| 76 | void *dlopen(char *path, int mode) |
| 77 | { |
| 78 | register ModulePtr mp; |
| 79 | static void *mainModule; |
| 80 | |
| 81 | /* |
| 82 | * Upon the first call register a terminate handler that will |
| 83 | * close all libraries. Also get a reference to the main module |
| 84 | * for use with loadbind. |
| 85 | */ |
| 86 | if (!mainModule) { |
| 87 | if ((mainModule = findMain()) == NULL) |
| 88 | return NULL; |
| 89 | atexit(terminate); |
| 90 | } |
| 91 | /* |
| 92 | * Scan the list of modules if have the module already loaded. |
| 93 | */ |
| 94 | for (mp = modList; mp; mp = mp->next) |
| 95 | if (strcmp(mp->name, path) == 0) { |
| 96 | mp->refCnt++; |
| 97 | return mp; |
| 98 | } |
| 99 | Newz(1000,mp,1,Module); |
| 100 | if (mp == NULL) { |
| 101 | errvalid++; |
| 102 | strcpy(errbuf, "Newz: "); |
| 103 | strcat(errbuf, strerror(errno)); |
| 104 | return NULL; |
| 105 | } |
| 106 | |
| 107 | if ((mp->name = savepv(path)) == NULL) { |
| 108 | errvalid++; |
| 109 | strcpy(errbuf, "savepv: "); |
| 110 | strcat(errbuf, strerror(errno)); |
| 111 | safefree(mp); |
| 112 | return NULL; |
| 113 | } |
| 114 | /* |
| 115 | * load should be declared load(const char *...). Thus we |
| 116 | * cast the path to a normal char *. Ugly. |
| 117 | */ |
| 118 | if ((mp->entry = (void *)load((char *)path, L_NOAUTODEFER, NULL)) == NULL) { |
| 119 | safefree(mp->name); |
| 120 | safefree(mp); |
| 121 | errvalid++; |
| 122 | strcpy(errbuf, "dlopen: "); |
| 123 | strcat(errbuf, path); |
| 124 | strcat(errbuf, ": "); |
| 125 | /* |
| 126 | * If AIX says the file is not executable, the error |
| 127 | * can be further described by querying the loader about |
| 128 | * the last error. |
| 129 | */ |
| 130 | if (errno == ENOEXEC) { |
| 131 | char *tmp[BUFSIZ/sizeof(char *)]; |
| 132 | if (loadquery(L_GETMESSAGES, tmp, sizeof(tmp)) == -1) |
| 133 | strcpy(errbuf, strerror(errno)); |
| 134 | else { |
| 135 | char **p; |
| 136 | for (p = tmp; *p; p++) |
| 137 | caterr(*p); |
| 138 | } |
| 139 | } else |
| 140 | strcat(errbuf, strerror(errno)); |
| 141 | return NULL; |
| 142 | } |
| 143 | mp->refCnt = 1; |
| 144 | mp->next = modList; |
| 145 | modList = mp; |
| 146 | if (loadbind(0, mainModule, mp->entry) == -1) { |
| 147 | dlclose(mp); |
| 148 | errvalid++; |
| 149 | strcpy(errbuf, "loadbind: "); |
| 150 | strcat(errbuf, strerror(errno)); |
| 151 | return NULL; |
| 152 | } |
| 153 | if (readExports(mp) == -1) { |
| 154 | dlclose(mp); |
| 155 | return NULL; |
| 156 | } |
| 157 | return mp; |
| 158 | } |
| 159 | |
| 160 | /* |
| 161 | * Attempt to decipher an AIX loader error message and append it |
| 162 | * to our static error message buffer. |
| 163 | */ |
| 164 | static void caterr(char *s) |
| 165 | { |
| 166 | register char *p = s; |
| 167 | |
| 168 | while (*p >= '0' && *p <= '9') |
| 169 | p++; |
| 170 | switch(atoi(s)) { |
| 171 | case L_ERROR_TOOMANY: |
| 172 | strcat(errbuf, "to many errors"); |
| 173 | break; |
| 174 | case L_ERROR_NOLIB: |
| 175 | strcat(errbuf, "can't load library"); |
| 176 | strcat(errbuf, p); |
| 177 | break; |
| 178 | case L_ERROR_UNDEF: |
| 179 | strcat(errbuf, "can't find symbol"); |
| 180 | strcat(errbuf, p); |
| 181 | break; |
| 182 | case L_ERROR_RLDBAD: |
| 183 | strcat(errbuf, "bad RLD"); |
| 184 | strcat(errbuf, p); |
| 185 | break; |
| 186 | case L_ERROR_FORMAT: |
| 187 | strcat(errbuf, "bad exec format in"); |
| 188 | strcat(errbuf, p); |
| 189 | break; |
| 190 | case L_ERROR_ERRNO: |
| 191 | strcat(errbuf, strerror(atoi(++p))); |
| 192 | break; |
| 193 | default: |
| 194 | strcat(errbuf, s); |
| 195 | break; |
| 196 | } |
| 197 | } |
| 198 | |
| 199 | void *dlsym(void *handle, const char *symbol) |
| 200 | { |
| 201 | register ModulePtr mp = (ModulePtr)handle; |
| 202 | register ExportPtr ep; |
| 203 | register int i; |
| 204 | |
| 205 | /* |
| 206 | * Could speed up search, but I assume that one assigns |
| 207 | * the result to function pointers anyways. |
| 208 | */ |
| 209 | for (ep = mp->exports, i = mp->nExports; i; i--, ep++) |
| 210 | if (strcmp(ep->name, symbol) == 0) |
| 211 | return ep->addr; |
| 212 | errvalid++; |
| 213 | strcpy(errbuf, "dlsym: undefined symbol "); |
| 214 | strcat(errbuf, symbol); |
| 215 | return NULL; |
| 216 | } |
| 217 | |
| 218 | char *dlerror(void) |
| 219 | { |
| 220 | if (errvalid) { |
| 221 | errvalid = 0; |
| 222 | return errbuf; |
| 223 | } |
| 224 | return NULL; |
| 225 | } |
| 226 | |
| 227 | int dlclose(void *handle) |
| 228 | { |
| 229 | register ModulePtr mp = (ModulePtr)handle; |
| 230 | int result; |
| 231 | register ModulePtr mp1; |
| 232 | |
| 233 | if (--mp->refCnt > 0) |
| 234 | return 0; |
| 235 | result = unload(mp->entry); |
| 236 | if (result == -1) { |
| 237 | errvalid++; |
| 238 | strcpy(errbuf, strerror(errno)); |
| 239 | } |
| 240 | if (mp->exports) { |
| 241 | register ExportPtr ep; |
| 242 | register int i; |
| 243 | for (ep = mp->exports, i = mp->nExports; i; i--, ep++) |
| 244 | if (ep->name) |
| 245 | safefree(ep->name); |
| 246 | safefree(mp->exports); |
| 247 | } |
| 248 | if (mp == modList) |
| 249 | modList = mp->next; |
| 250 | else { |
| 251 | for (mp1 = modList; mp1; mp1 = mp1->next) |
| 252 | if (mp1->next == mp) { |
| 253 | mp1->next = mp->next; |
| 254 | break; |
| 255 | } |
| 256 | } |
| 257 | safefree(mp->name); |
| 258 | safefree(mp); |
| 259 | return result; |
| 260 | } |
| 261 | |
| 262 | static void terminate(void) |
| 263 | { |
| 264 | while (modList) |
| 265 | dlclose(modList); |
| 266 | } |
| 267 | |
| 268 | /* Added by Wayne Scott |
| 269 | * This is needed because the ldopen system call calls |
| 270 | * calloc to allocated a block of date. The ldclose call calls free. |
| 271 | * Without this we get this system calloc and perl's free, resulting |
| 272 | * in a "Bad free" message. This way we always use perl's malloc. |
| 273 | */ |
| 274 | void *calloc(size_t ne, size_t sz) |
| 275 | { |
| 276 | void *out; |
| 277 | |
| 278 | out = (void *) safemalloc(ne*sz); |
| 279 | memzero(out, ne*sz); |
| 280 | return(out); |
| 281 | } |
| 282 | |
| 283 | /* |
| 284 | * Build the export table from the XCOFF .loader section. |
| 285 | */ |
| 286 | static int readExports(ModulePtr mp) |
| 287 | { |
| 288 | LDFILE *ldp = NULL; |
| 289 | SCNHDR sh; |
| 290 | LDHDR *lhp; |
| 291 | char *ldbuf; |
| 292 | LDSYM *ls; |
| 293 | int i; |
| 294 | ExportPtr ep; |
| 295 | |
| 296 | if ((ldp = ldopen(mp->name, ldp)) == NULL) { |
| 297 | struct ld_info *lp; |
| 298 | char *buf; |
| 299 | int size = 4*1024; |
| 300 | if (errno != ENOENT) { |
| 301 | errvalid++; |
| 302 | strcpy(errbuf, "readExports: "); |
| 303 | strcat(errbuf, strerror(errno)); |
| 304 | return -1; |
| 305 | } |
| 306 | /* |
| 307 | * The module might be loaded due to the LIBPATH |
| 308 | * environment variable. Search for the loaded |
| 309 | * module using L_GETINFO. |
| 310 | */ |
| 311 | if ((buf = safemalloc(size)) == NULL) { |
| 312 | errvalid++; |
| 313 | strcpy(errbuf, "readExports: "); |
| 314 | strcat(errbuf, strerror(errno)); |
| 315 | return -1; |
| 316 | } |
| 317 | while ((i = loadquery(L_GETINFO, buf, size)) == -1 && errno == ENOMEM) { |
| 318 | safefree(buf); |
| 319 | size += 4*1024; |
| 320 | if ((buf = safemalloc(size)) == NULL) { |
| 321 | errvalid++; |
| 322 | strcpy(errbuf, "readExports: "); |
| 323 | strcat(errbuf, strerror(errno)); |
| 324 | return -1; |
| 325 | } |
| 326 | } |
| 327 | if (i == -1) { |
| 328 | errvalid++; |
| 329 | strcpy(errbuf, "readExports: "); |
| 330 | strcat(errbuf, strerror(errno)); |
| 331 | safefree(buf); |
| 332 | return -1; |
| 333 | } |
| 334 | /* |
| 335 | * Traverse the list of loaded modules. The entry point |
| 336 | * returned by load() does actually point to the data |
| 337 | * segment origin. |
| 338 | */ |
| 339 | lp = (struct ld_info *)buf; |
| 340 | while (lp) { |
| 341 | if (lp->ldinfo_dataorg == mp->entry) { |
| 342 | ldp = ldopen(lp->ldinfo_filename, ldp); |
| 343 | break; |
| 344 | } |
| 345 | if (lp->ldinfo_next == 0) |
| 346 | lp = NULL; |
| 347 | else |
| 348 | lp = (struct ld_info *)((char *)lp + lp->ldinfo_next); |
| 349 | } |
| 350 | safefree(buf); |
| 351 | if (!ldp) { |
| 352 | errvalid++; |
| 353 | strcpy(errbuf, "readExports: "); |
| 354 | strcat(errbuf, strerror(errno)); |
| 355 | return -1; |
| 356 | } |
| 357 | } |
| 358 | if (TYPE(ldp) != U802TOCMAGIC) { |
| 359 | errvalid++; |
| 360 | strcpy(errbuf, "readExports: bad magic"); |
| 361 | while(ldclose(ldp) == FAILURE) |
| 362 | ; |
| 363 | return -1; |
| 364 | } |
| 365 | if (ldnshread(ldp, _LOADER, &sh) != SUCCESS) { |
| 366 | errvalid++; |
| 367 | strcpy(errbuf, "readExports: cannot read loader section header"); |
| 368 | while(ldclose(ldp) == FAILURE) |
| 369 | ; |
| 370 | return -1; |
| 371 | } |
| 372 | /* |
| 373 | * We read the complete loader section in one chunk, this makes |
| 374 | * finding long symbol names residing in the string table easier. |
| 375 | */ |
| 376 | if ((ldbuf = (char *)safemalloc(sh.s_size)) == NULL) { |
| 377 | errvalid++; |
| 378 | strcpy(errbuf, "readExports: "); |
| 379 | strcat(errbuf, strerror(errno)); |
| 380 | while(ldclose(ldp) == FAILURE) |
| 381 | ; |
| 382 | return -1; |
| 383 | } |
| 384 | if (FSEEK(ldp, sh.s_scnptr, BEGINNING) != OKFSEEK) { |
| 385 | errvalid++; |
| 386 | strcpy(errbuf, "readExports: cannot seek to loader section"); |
| 387 | safefree(ldbuf); |
| 388 | while(ldclose(ldp) == FAILURE) |
| 389 | ; |
| 390 | return -1; |
| 391 | } |
| 392 | if (FREAD(ldbuf, sh.s_size, 1, ldp) != 1) { |
| 393 | errvalid++; |
| 394 | strcpy(errbuf, "readExports: cannot read loader section"); |
| 395 | safefree(ldbuf); |
| 396 | while(ldclose(ldp) == FAILURE) |
| 397 | ; |
| 398 | return -1; |
| 399 | } |
| 400 | lhp = (LDHDR *)ldbuf; |
| 401 | ls = (LDSYM *)(ldbuf+LDHDRSZ); |
| 402 | /* |
| 403 | * Count the number of exports to include in our export table. |
| 404 | */ |
| 405 | for (i = lhp->l_nsyms; i; i--, ls++) { |
| 406 | if (!LDR_EXPORT(*ls)) |
| 407 | continue; |
| 408 | mp->nExports++; |
| 409 | } |
| 410 | Newz(1001, mp->exports, mp->nExports, Export); |
| 411 | if (mp->exports == NULL) { |
| 412 | errvalid++; |
| 413 | strcpy(errbuf, "readExports: "); |
| 414 | strcat(errbuf, strerror(errno)); |
| 415 | safefree(ldbuf); |
| 416 | while(ldclose(ldp) == FAILURE) |
| 417 | ; |
| 418 | return -1; |
| 419 | } |
| 420 | /* |
| 421 | * Fill in the export table. All entries are relative to |
| 422 | * the entry point we got from load. |
| 423 | */ |
| 424 | ep = mp->exports; |
| 425 | ls = (LDSYM *)(ldbuf+LDHDRSZ); |
| 426 | for (i = lhp->l_nsyms; i; i--, ls++) { |
| 427 | char *symname; |
| 428 | if (!LDR_EXPORT(*ls)) |
| 429 | continue; |
| 430 | if (ls->l_zeroes == 0) |
| 431 | symname = ls->l_offset+lhp->l_stoff+ldbuf; |
| 432 | else |
| 433 | symname = ls->l_name; |
| 434 | ep->name = savepv(symname); |
| 435 | ep->addr = (void *)((unsigned long)mp->entry + ls->l_value); |
| 436 | ep++; |
| 437 | } |
| 438 | safefree(ldbuf); |
| 439 | while(ldclose(ldp) == FAILURE) |
| 440 | ; |
| 441 | return 0; |
| 442 | } |
| 443 | |
| 444 | /* |
| 445 | * Find the main modules entry point. This is used as export pointer |
| 446 | * for loadbind() to be able to resolve references to the main part. |
| 447 | */ |
| 448 | static void * findMain(void) |
| 449 | { |
| 450 | struct ld_info *lp; |
| 451 | char *buf; |
| 452 | int size = 4*1024; |
| 453 | int i; |
| 454 | void *ret; |
| 455 | |
| 456 | if ((buf = safemalloc(size)) == NULL) { |
| 457 | errvalid++; |
| 458 | strcpy(errbuf, "findMain: "); |
| 459 | strcat(errbuf, strerror(errno)); |
| 460 | return NULL; |
| 461 | } |
| 462 | while ((i = loadquery(L_GETINFO, buf, size)) == -1 && errno == ENOMEM) { |
| 463 | safefree(buf); |
| 464 | size += 4*1024; |
| 465 | if ((buf = safemalloc(size)) == NULL) { |
| 466 | errvalid++; |
| 467 | strcpy(errbuf, "findMain: "); |
| 468 | strcat(errbuf, strerror(errno)); |
| 469 | return NULL; |
| 470 | } |
| 471 | } |
| 472 | if (i == -1) { |
| 473 | errvalid++; |
| 474 | strcpy(errbuf, "findMain: "); |
| 475 | strcat(errbuf, strerror(errno)); |
| 476 | safefree(buf); |
| 477 | return NULL; |
| 478 | } |
| 479 | /* |
| 480 | * The first entry is the main module. The entry point |
| 481 | * returned by load() does actually point to the data |
| 482 | * segment origin. |
| 483 | */ |
| 484 | lp = (struct ld_info *)buf; |
| 485 | ret = lp->ldinfo_dataorg; |
| 486 | safefree(buf); |
| 487 | return ret; |
| 488 | } |
| 489 | |
| 490 | /* dl_dlopen.xs |
| 491 | * |
| 492 | * Platform: SunOS/Solaris, possibly others which use dlopen. |
| 493 | * Author: Paul Marquess (pmarquess@bfsec.bt.co.uk) |
| 494 | * Created: 10th July 1994 |
| 495 | * |
| 496 | * Modified: |
| 497 | * 15th July 1994 - Added code to explicitly save any error messages. |
| 498 | * 3rd August 1994 - Upgraded to v3 spec. |
| 499 | * 9th August 1994 - Changed to use IV |
| 500 | * 10th August 1994 - Tim Bunce: Added RTLD_LAZY, switchable debugging, |
| 501 | * basic FreeBSD support, removed ClearError |
| 502 | * |
| 503 | */ |
| 504 | |
| 505 | /* Porting notes: |
| 506 | |
| 507 | see dl_dlopen.xs |
| 508 | |
| 509 | */ |
| 510 | |
| 511 | #include "dlutils.c" /* SaveError() etc */ |
| 512 | |
| 513 | |
| 514 | static void |
| 515 | dl_private_init() |
| 516 | { |
| 517 | (void)dl_generic_private_init(); |
| 518 | } |
| 519 | |
| 520 | MODULE = DynaLoader PACKAGE = DynaLoader |
| 521 | |
| 522 | BOOT: |
| 523 | (void)dl_private_init(); |
| 524 | |
| 525 | |
| 526 | void * |
| 527 | dl_load_file(filename) |
| 528 | char * filename |
| 529 | CODE: |
| 530 | DLDEBUG(1,fprintf(stderr,"dl_load_file(%s):\n", filename)); |
| 531 | RETVAL = dlopen(filename, 1) ; |
| 532 | DLDEBUG(2,fprintf(stderr," libref=%x\n", RETVAL)); |
| 533 | ST(0) = sv_newmortal() ; |
| 534 | if (RETVAL == NULL) |
| 535 | SaveError("%s",dlerror()) ; |
| 536 | else |
| 537 | sv_setiv( ST(0), (IV)RETVAL); |
| 538 | |
| 539 | |
| 540 | void * |
| 541 | dl_find_symbol(libhandle, symbolname) |
| 542 | void * libhandle |
| 543 | char * symbolname |
| 544 | CODE: |
| 545 | DLDEBUG(2,fprintf(stderr,"dl_find_symbol(handle=%x, symbol=%s)\n", |
| 546 | libhandle, symbolname)); |
| 547 | RETVAL = dlsym(libhandle, symbolname); |
| 548 | DLDEBUG(2,fprintf(stderr," symbolref = %x\n", RETVAL)); |
| 549 | ST(0) = sv_newmortal() ; |
| 550 | if (RETVAL == NULL) |
| 551 | SaveError("%s",dlerror()) ; |
| 552 | else |
| 553 | sv_setiv( ST(0), (IV)RETVAL); |
| 554 | |
| 555 | |
| 556 | void |
| 557 | dl_undef_symbols() |
| 558 | PPCODE: |
| 559 | |
| 560 | |
| 561 | |
| 562 | # These functions should not need changing on any platform: |
| 563 | |
| 564 | void |
| 565 | dl_install_xsub(perl_name, symref, filename="$Package") |
| 566 | char * perl_name |
| 567 | void * symref |
| 568 | char * filename |
| 569 | CODE: |
| 570 | DLDEBUG(2,fprintf(stderr,"dl_install_xsub(name=%s, symref=%x)\n", |
| 571 | perl_name, symref)); |
| 572 | ST(0)=sv_2mortal(newRV((SV*)newXS(perl_name, (void(*)())symref, filename))); |
| 573 | |
| 574 | |
| 575 | char * |
| 576 | dl_error() |
| 577 | CODE: |
| 578 | RETVAL = LastError ; |
| 579 | OUTPUT: |
| 580 | RETVAL |
| 581 | |
| 582 | # end. |
projects / p5sagit/p5-mst-13.2.git / blame