Mercurial > hg > graal-compiler
annotate agent/src/os/linux/ps_core.c @ 1552:c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
Summary: Change all the Sun copyrights to Oracle copyright
Reviewed-by: ohair
| author | trims |
|---|---|
| date | Thu, 27 May 2010 19:08:38 -0700 |
| parents | bc32f286fae0 |
| children | 0a8e0d4345b3 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 2003, 2009, Oracle and/or its affiliates. All rights reserved. |
| 0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 25 #include <jni.h> | |
| 26 #include <unistd.h> | |
| 27 #include <fcntl.h> | |
| 28 #include <string.h> | |
| 29 #include <stdlib.h> | |
| 30 #include <stddef.h> | |
| 31 #include <elf.h> | |
| 32 #include <link.h> | |
| 33 #include "libproc_impl.h" | |
| 34 #include "salibelf.h" | |
| 35 | |
| 36 // This file has the libproc implementation to read core files. | |
| 37 // For live processes, refer to ps_proc.c. Portions of this is adapted | |
| 38 // /modelled after Solaris libproc.so (in particular Pcore.c) | |
| 39 | |
| 40 //---------------------------------------------------------------------- | |
| 41 // ps_prochandle cleanup helper functions | |
| 42 | |
| 43 // close all file descriptors | |
| 44 static void close_elf_files(struct ps_prochandle* ph) { | |
| 45 lib_info* lib = NULL; | |
| 46 | |
| 47 // close core file descriptor | |
| 48 if (ph->core->core_fd >= 0) | |
| 49 close(ph->core->core_fd); | |
| 50 | |
| 51 // close exec file descriptor | |
| 52 if (ph->core->exec_fd >= 0) | |
| 53 close(ph->core->exec_fd); | |
| 54 | |
| 55 // close interp file descriptor | |
| 56 if (ph->core->interp_fd >= 0) | |
| 57 close(ph->core->interp_fd); | |
| 58 | |
| 59 // close class share archive file | |
| 60 if (ph->core->classes_jsa_fd >= 0) | |
| 61 close(ph->core->classes_jsa_fd); | |
| 62 | |
| 63 // close all library file descriptors | |
| 64 lib = ph->libs; | |
| 65 while (lib) { | |
| 66 int fd = lib->fd; | |
| 67 if (fd >= 0 && fd != ph->core->exec_fd) close(fd); | |
| 68 lib = lib->next; | |
| 69 } | |
| 70 } | |
| 71 | |
| 72 // clean all map_info stuff | |
| 73 static void destroy_map_info(struct ps_prochandle* ph) { | |
| 74 map_info* map = ph->core->maps; | |
| 75 while (map) { | |
| 76 map_info* next = map->next; | |
| 77 free(map); | |
| 78 map = next; | |
| 79 } | |
| 80 | |
| 81 if (ph->core->map_array) { | |
| 82 free(ph->core->map_array); | |
| 83 } | |
| 84 | |
| 85 // Part of the class sharing workaround | |
| 86 map = ph->core->class_share_maps; | |
| 87 while (map) { | |
| 88 map_info* next = map->next; | |
| 89 free(map); | |
| 90 map = next; | |
| 91 } | |
| 92 } | |
| 93 | |
| 94 // ps_prochandle operations | |
| 95 static void core_release(struct ps_prochandle* ph) { | |
| 96 if (ph->core) { | |
| 97 close_elf_files(ph); | |
| 98 destroy_map_info(ph); | |
| 99 free(ph->core); | |
| 100 } | |
| 101 } | |
| 102 | |
| 103 static map_info* allocate_init_map(int fd, off_t offset, uintptr_t vaddr, size_t memsz) { | |
| 104 map_info* map; | |
| 105 if ( (map = (map_info*) calloc(1, sizeof(map_info))) == NULL) { | |
| 106 print_debug("can't allocate memory for map_info\n"); | |
| 107 return NULL; | |
| 108 } | |
| 109 | |
| 110 // initialize map | |
| 111 map->fd = fd; | |
| 112 map->offset = offset; | |
| 113 map->vaddr = vaddr; | |
| 114 map->memsz = memsz; | |
| 115 return map; | |
| 116 } | |
| 117 | |
| 118 // add map info with given fd, offset, vaddr and memsz | |
| 119 static map_info* add_map_info(struct ps_prochandle* ph, int fd, off_t offset, | |
| 120 uintptr_t vaddr, size_t memsz) { | |
| 121 map_info* map; | |
| 122 if ((map = allocate_init_map(fd, offset, vaddr, memsz)) == NULL) { | |
| 123 return NULL; | |
| 124 } | |
| 125 | |
| 126 // add this to map list | |
| 127 map->next = ph->core->maps; | |
| 128 ph->core->maps = map; | |
| 129 ph->core->num_maps++; | |
| 130 | |
| 131 return map; | |
| 132 } | |
| 133 | |
| 134 // Part of the class sharing workaround | |
| 135 static map_info* add_class_share_map_info(struct ps_prochandle* ph, off_t offset, | |
| 136 uintptr_t vaddr, size_t memsz) { | |
| 137 map_info* map; | |
| 138 if ((map = allocate_init_map(ph->core->classes_jsa_fd, | |
| 139 offset, vaddr, memsz)) == NULL) { | |
| 140 return NULL; | |
| 141 } | |
| 142 | |
| 143 map->next = ph->core->class_share_maps; | |
| 144 ph->core->class_share_maps = map; | |
| 145 } | |
| 146 | |
| 147 // Return the map_info for the given virtual address. We keep a sorted | |
| 148 // array of pointers in ph->map_array, so we can binary search. | |
| 149 static map_info* core_lookup(struct ps_prochandle *ph, uintptr_t addr) | |
| 150 { | |
| 151 int mid, lo = 0, hi = ph->core->num_maps - 1; | |
| 152 map_info *mp; | |
| 153 | |
| 154 while (hi - lo > 1) { | |
| 155 mid = (lo + hi) / 2; | |
| 156 if (addr >= ph->core->map_array[mid]->vaddr) | |
| 157 lo = mid; | |
| 158 else | |
| 159 hi = mid; | |
| 160 } | |
| 161 | |
| 162 if (addr < ph->core->map_array[hi]->vaddr) | |
| 163 mp = ph->core->map_array[lo]; | |
| 164 else | |
| 165 mp = ph->core->map_array[hi]; | |
| 166 | |
| 167 if (addr >= mp->vaddr && addr < mp->vaddr + mp->memsz) | |
| 168 return (mp); | |
| 169 | |
| 170 | |
| 171 // Part of the class sharing workaround | |
| 172 // Unfortunately, we have no way of detecting -Xshare state. | |
| 173 // Check out the share maps atlast, if we don't find anywhere. | |
| 174 // This is done this way so to avoid reading share pages | |
| 175 // ahead of other normal maps. For eg. with -Xshare:off we don't | |
| 176 // want to prefer class sharing data to data from core. | |
| 177 mp = ph->core->class_share_maps; | |
| 178 if (mp) { | |
| 179 print_debug("can't locate map_info at 0x%lx, trying class share maps\n", | |
| 180 addr); | |
| 181 } | |
| 182 while (mp) { | |
| 183 if (addr >= mp->vaddr && addr < mp->vaddr + mp->memsz) { | |
| 184 print_debug("located map_info at 0x%lx from class share maps\n", | |
| 185 addr); | |
| 186 return (mp); | |
| 187 } | |
| 188 mp = mp->next; | |
| 189 } | |
| 190 | |
| 191 print_debug("can't locate map_info at 0x%lx\n", addr); | |
| 192 return (NULL); | |
| 193 } | |
| 194 | |
| 195 //--------------------------------------------------------------- | |
| 196 // Part of the class sharing workaround: | |
| 197 // | |
| 198 // With class sharing, pages are mapped from classes[_g].jsa file. | |
| 199 // The read-only class sharing pages are mapped as MAP_SHARED, | |
| 200 // PROT_READ pages. These pages are not dumped into core dump. | |
| 201 // With this workaround, these pages are read from classes[_g].jsa. | |
| 202 | |
| 203 // FIXME: !HACK ALERT! | |
| 204 // The format of sharing achive file header is needed to read shared heap | |
| 205 // file mappings. For now, I am hard coding portion of FileMapHeader here. | |
| 206 // Refer to filemap.hpp. | |
| 207 | |
| 208 // FileMapHeader describes the shared space data in the file to be | |
| 209 // mapped. This structure gets written to a file. It is not a class, | |
| 210 // so that the compilers don't add any compiler-private data to it. | |
| 211 | |
| 212 // Refer to CompactingPermGenGen::n_regions in compactingPermGenGen.hpp | |
| 213 #define NUM_SHARED_MAPS 4 | |
| 214 | |
| 215 // Refer to FileMapInfo::_current_version in filemap.hpp | |
| 216 #define CURRENT_ARCHIVE_VERSION 1 | |
| 217 | |
| 218 struct FileMapHeader { | |
| 219 int _magic; // identify file type. | |
| 220 int _version; // (from enum, above.) | |
| 221 size_t _alignment; // how shared archive should be aligned | |
| 222 | |
| 223 struct space_info { | |
| 224 int _file_offset; // sizeof(this) rounded to vm page size | |
| 225 char* _base; // copy-on-write base address | |
| 226 size_t _capacity; // for validity checking | |
| 227 size_t _used; // for setting space top on read | |
| 228 | |
| 229 // 4991491 NOTICE These are C++ bool's in filemap.hpp and must match up with | |
| 230 // the C type matching the C++ bool type on any given platform. For | |
| 231 // Hotspot on Linux we assume the corresponding C type is char but | |
| 232 // licensees on Linux versions may need to adjust the type of these fields. | |
| 233 char _read_only; // read only space? | |
| 234 char _allow_exec; // executable code in space? | |
| 235 | |
| 236 } _space[NUM_SHARED_MAPS]; // was _space[CompactingPermGenGen::n_regions]; | |
| 237 | |
| 238 // Ignore the rest of the FileMapHeader. We don't need those fields here. | |
| 239 }; | |
| 240 | |
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241 static bool read_jboolean(struct ps_prochandle* ph, uintptr_t addr, jboolean* pvalue) { |
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242 jboolean i; |
| 0 | 243 if (ps_pdread(ph, (psaddr_t) addr, &i, sizeof(i)) == PS_OK) { |
| 244 *pvalue = i; | |
| 245 return true; | |
| 246 } else { | |
| 247 return false; | |
| 248 } | |
| 249 } | |
| 250 | |
| 251 static bool read_pointer(struct ps_prochandle* ph, uintptr_t addr, uintptr_t* pvalue) { | |
| 252 uintptr_t uip; | |
| 253 if (ps_pdread(ph, (psaddr_t) addr, &uip, sizeof(uip)) == PS_OK) { | |
| 254 *pvalue = uip; | |
| 255 return true; | |
| 256 } else { | |
| 257 return false; | |
| 258 } | |
| 259 } | |
| 260 | |
| 261 // used to read strings from debuggee | |
| 262 static bool read_string(struct ps_prochandle* ph, uintptr_t addr, char* buf, size_t size) { | |
| 263 size_t i = 0; | |
| 264 char c = ' '; | |
| 265 | |
| 266 while (c != '\0') { | |
| 267 if (ps_pdread(ph, (psaddr_t) addr, &c, sizeof(char)) != PS_OK) | |
| 268 return false; | |
| 269 if (i < size - 1) | |
| 270 buf[i] = c; | |
| 271 else // smaller buffer | |
| 272 return false; | |
| 273 i++; addr++; | |
| 274 } | |
| 275 | |
| 276 buf[i] = '\0'; | |
| 277 return true; | |
| 278 } | |
| 279 | |
| 280 #define USE_SHARED_SPACES_SYM "UseSharedSpaces" | |
| 281 // mangled name of Arguments::SharedArchivePath | |
| 282 #define SHARED_ARCHIVE_PATH_SYM "_ZN9Arguments17SharedArchivePathE" | |
| 283 | |
| 284 static bool init_classsharing_workaround(struct ps_prochandle* ph) { | |
| 285 lib_info* lib = ph->libs; | |
| 286 while (lib != NULL) { | |
| 287 // we are iterating over shared objects from the core dump. look for | |
| 288 // libjvm[_g].so. | |
| 289 const char *jvm_name = 0; | |
| 290 if ((jvm_name = strstr(lib->name, "/libjvm.so")) != 0 || | |
| 291 (jvm_name = strstr(lib->name, "/libjvm_g.so")) != 0) { | |
| 292 char classes_jsa[PATH_MAX]; | |
| 293 struct FileMapHeader header; | |
| 294 size_t n = 0; | |
| 295 int fd = -1, m = 0; | |
| 296 uintptr_t base = 0, useSharedSpacesAddr = 0; | |
| 297 uintptr_t sharedArchivePathAddrAddr = 0, sharedArchivePathAddr = 0; | |
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298 jboolean useSharedSpaces = 0; |
| 0 | 299 map_info* mi = 0; |
| 300 | |
| 301 memset(classes_jsa, 0, sizeof(classes_jsa)); | |
| 302 jvm_name = lib->name; | |
| 303 useSharedSpacesAddr = lookup_symbol(ph, jvm_name, USE_SHARED_SPACES_SYM); | |
| 304 if (useSharedSpacesAddr == 0) { | |
| 305 print_debug("can't lookup 'UseSharedSpaces' flag\n"); | |
| 306 return false; | |
| 307 } | |
| 308 | |
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309 // Hotspot vm types are not exported to build this library. So |
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310 // using equivalent type jboolean to read the value of |
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311 // UseSharedSpaces which is same as hotspot type "bool". |
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312 if (read_jboolean(ph, useSharedSpacesAddr, &useSharedSpaces) != true) { |
| 0 | 313 print_debug("can't read the value of 'UseSharedSpaces' flag\n"); |
| 314 return false; | |
| 315 } | |
| 316 | |
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317 if ((int)useSharedSpaces == 0) { |
| 0 | 318 print_debug("UseSharedSpaces is false, assuming -Xshare:off!\n"); |
| 319 return true; | |
| 320 } | |
| 321 | |
| 322 sharedArchivePathAddrAddr = lookup_symbol(ph, jvm_name, SHARED_ARCHIVE_PATH_SYM); | |
| 323 if (sharedArchivePathAddrAddr == 0) { | |
| 324 print_debug("can't lookup shared archive path symbol\n"); | |
| 325 return false; | |
| 326 } | |
| 327 | |
| 328 if (read_pointer(ph, sharedArchivePathAddrAddr, &sharedArchivePathAddr) != true) { | |
| 329 print_debug("can't read shared archive path pointer\n"); | |
| 330 return false; | |
| 331 } | |
| 332 | |
| 333 if (read_string(ph, sharedArchivePathAddr, classes_jsa, sizeof(classes_jsa)) != true) { | |
| 334 print_debug("can't read shared archive path value\n"); | |
| 335 return false; | |
| 336 } | |
| 337 | |
| 338 print_debug("looking for %s\n", classes_jsa); | |
| 339 // open the class sharing archive file | |
| 340 fd = pathmap_open(classes_jsa); | |
| 341 if (fd < 0) { | |
| 342 print_debug("can't open %s!\n", classes_jsa); | |
| 343 ph->core->classes_jsa_fd = -1; | |
| 344 return false; | |
| 345 } else { | |
| 346 print_debug("opened %s\n", classes_jsa); | |
| 347 } | |
| 348 | |
| 349 // read FileMapHeader from the file | |
| 350 memset(&header, 0, sizeof(struct FileMapHeader)); | |
| 351 if ((n = read(fd, &header, sizeof(struct FileMapHeader))) | |
| 352 != sizeof(struct FileMapHeader)) { | |
| 353 print_debug("can't read shared archive file map header from %s\n", classes_jsa); | |
| 354 close(fd); | |
| 355 return false; | |
| 356 } | |
| 357 | |
| 358 // check file magic | |
| 359 if (header._magic != 0xf00baba2) { | |
| 360 print_debug("%s has bad shared archive file magic number 0x%x, expecing 0xf00baba2\n", | |
| 361 classes_jsa, header._magic); | |
| 362 close(fd); | |
| 363 return false; | |
| 364 } | |
| 365 | |
| 366 // check version | |
| 367 if (header._version != CURRENT_ARCHIVE_VERSION) { | |
| 368 print_debug("%s has wrong shared archive file version %d, expecting %d\n", | |
| 369 classes_jsa, header._version, CURRENT_ARCHIVE_VERSION); | |
| 370 close(fd); | |
| 371 return false; | |
| 372 } | |
| 373 | |
| 374 ph->core->classes_jsa_fd = fd; | |
| 375 // add read-only maps from classes[_g].jsa to the list of maps | |
| 376 for (m = 0; m < NUM_SHARED_MAPS; m++) { | |
| 377 if (header._space[m]._read_only) { | |
| 378 base = (uintptr_t) header._space[m]._base; | |
| 379 // no need to worry about the fractional pages at-the-end. | |
| 380 // possible fractional pages are handled by core_read_data. | |
| 381 add_class_share_map_info(ph, (off_t) header._space[m]._file_offset, | |
| 382 base, (size_t) header._space[m]._used); | |
| 383 print_debug("added a share archive map at 0x%lx\n", base); | |
| 384 } | |
| 385 } | |
| 386 return true; | |
| 387 } | |
| 388 lib = lib->next; | |
| 389 } | |
| 390 return true; | |
| 391 } | |
| 392 | |
| 393 | |
| 394 //--------------------------------------------------------------------------- | |
| 395 // functions to handle map_info | |
| 396 | |
| 397 // Order mappings based on virtual address. We use this function as the | |
| 398 // callback for sorting the array of map_info pointers. | |
| 399 static int core_cmp_mapping(const void *lhsp, const void *rhsp) | |
| 400 { | |
| 401 const map_info *lhs = *((const map_info **)lhsp); | |
| 402 const map_info *rhs = *((const map_info **)rhsp); | |
| 403 | |
| 404 if (lhs->vaddr == rhs->vaddr) | |
| 405 return (0); | |
| 406 | |
| 407 return (lhs->vaddr < rhs->vaddr ? -1 : 1); | |
| 408 } | |
| 409 | |
| 410 // we sort map_info by starting virtual address so that we can do | |
| 411 // binary search to read from an address. | |
| 412 static bool sort_map_array(struct ps_prochandle* ph) { | |
| 413 size_t num_maps = ph->core->num_maps; | |
| 414 map_info* map = ph->core->maps; | |
| 415 int i = 0; | |
| 416 | |
| 417 // allocate map_array | |
| 418 map_info** array; | |
| 419 if ( (array = (map_info**) malloc(sizeof(map_info*) * num_maps)) == NULL) { | |
| 420 print_debug("can't allocate memory for map array\n"); | |
| 421 return false; | |
| 422 } | |
| 423 | |
| 424 // add maps to array | |
| 425 while (map) { | |
| 426 array[i] = map; | |
| 427 i++; | |
| 428 map = map->next; | |
| 429 } | |
| 430 | |
| 431 // sort is called twice. If this is second time, clear map array | |
| 432 if (ph->core->map_array) free(ph->core->map_array); | |
| 433 ph->core->map_array = array; | |
| 434 // sort the map_info array by base virtual address. | |
| 435 qsort(ph->core->map_array, ph->core->num_maps, sizeof (map_info*), | |
| 436 core_cmp_mapping); | |
| 437 | |
| 438 // print map | |
| 439 if (is_debug()) { | |
| 440 int j = 0; | |
| 441 print_debug("---- sorted virtual address map ----\n"); | |
| 442 for (j = 0; j < ph->core->num_maps; j++) { | |
| 443 print_debug("base = 0x%lx\tsize = %d\n", ph->core->map_array[j]->vaddr, | |
| 444 ph->core->map_array[j]->memsz); | |
| 445 } | |
| 446 } | |
| 447 | |
| 448 return true; | |
| 449 } | |
| 450 | |
| 451 #ifndef MIN | |
| 452 #define MIN(x, y) (((x) < (y))? (x): (y)) | |
| 453 #endif | |
| 454 | |
| 455 static bool core_read_data(struct ps_prochandle* ph, uintptr_t addr, char *buf, size_t size) { | |
| 456 ssize_t resid = size; | |
| 457 int page_size=sysconf(_SC_PAGE_SIZE); | |
| 458 while (resid != 0) { | |
| 459 map_info *mp = core_lookup(ph, addr); | |
| 460 uintptr_t mapoff; | |
| 461 ssize_t len, rem; | |
| 462 off_t off; | |
| 463 int fd; | |
| 464 | |
| 465 if (mp == NULL) | |
| 466 break; /* No mapping for this address */ | |
| 467 | |
| 468 fd = mp->fd; | |
| 469 mapoff = addr - mp->vaddr; | |
| 470 len = MIN(resid, mp->memsz - mapoff); | |
| 471 off = mp->offset + mapoff; | |
| 472 | |
| 473 if ((len = pread(fd, buf, len, off)) <= 0) | |
| 474 break; | |
| 475 | |
| 476 resid -= len; | |
| 477 addr += len; | |
| 478 buf = (char *)buf + len; | |
| 479 | |
| 480 // mappings always start at page boundary. But, may end in fractional | |
| 481 // page. fill zeros for possible fractional page at the end of a mapping. | |
| 482 rem = mp->memsz % page_size; | |
| 483 if (rem > 0) { | |
| 484 rem = page_size - rem; | |
| 485 len = MIN(resid, rem); | |
| 486 resid -= len; | |
| 487 addr += len; | |
| 488 // we are not assuming 'buf' to be zero initialized. | |
| 489 memset(buf, 0, len); | |
| 490 buf += len; | |
| 491 } | |
| 492 } | |
| 493 | |
| 494 if (resid) { | |
| 495 print_debug("core read failed for %d byte(s) @ 0x%lx (%d more bytes)\n", | |
| 496 size, addr, resid); | |
| 497 return false; | |
| 498 } else { | |
| 499 return true; | |
| 500 } | |
| 501 } | |
| 502 | |
| 503 // null implementation for write | |
| 504 static bool core_write_data(struct ps_prochandle* ph, | |
| 505 uintptr_t addr, const char *buf , size_t size) { | |
| 506 return false; | |
| 507 } | |
| 508 | |
| 509 static bool core_get_lwp_regs(struct ps_prochandle* ph, lwpid_t lwp_id, | |
| 510 struct user_regs_struct* regs) { | |
| 511 // for core we have cached the lwp regs from NOTE section | |
| 512 thread_info* thr = ph->threads; | |
| 513 while (thr) { | |
| 514 if (thr->lwp_id == lwp_id) { | |
| 515 memcpy(regs, &thr->regs, sizeof(struct user_regs_struct)); | |
| 516 return true; | |
| 517 } | |
| 518 thr = thr->next; | |
| 519 } | |
| 520 return false; | |
| 521 } | |
| 522 | |
| 523 static ps_prochandle_ops core_ops = { | |
|
50
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524 .release= core_release, |
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525 .p_pread= core_read_data, |
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526 .p_pwrite= core_write_data, |
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527 .get_lwp_regs= core_get_lwp_regs |
| 0 | 528 }; |
| 529 | |
| 530 // read regs and create thread from NT_PRSTATUS entries from core file | |
| 531 static bool core_handle_prstatus(struct ps_prochandle* ph, const char* buf, size_t nbytes) { | |
| 532 // we have to read prstatus_t from buf | |
| 533 // assert(nbytes == sizeof(prstaus_t), "size mismatch on prstatus_t"); | |
| 534 prstatus_t* prstat = (prstatus_t*) buf; | |
| 535 thread_info* newthr; | |
| 536 print_debug("got integer regset for lwp %d\n", prstat->pr_pid); | |
| 537 // we set pthread_t to -1 for core dump | |
| 538 if((newthr = add_thread_info(ph, (pthread_t) -1, prstat->pr_pid)) == NULL) | |
| 539 return false; | |
| 540 | |
| 541 // copy regs | |
| 542 memcpy(&newthr->regs, prstat->pr_reg, sizeof(struct user_regs_struct)); | |
| 543 | |
| 544 if (is_debug()) { | |
| 545 print_debug("integer regset\n"); | |
| 546 #ifdef i386 | |
| 547 // print the regset | |
| 548 print_debug("\teax = 0x%x\n", newthr->regs.eax); | |
| 549 print_debug("\tebx = 0x%x\n", newthr->regs.ebx); | |
| 550 print_debug("\tecx = 0x%x\n", newthr->regs.ecx); | |
| 551 print_debug("\tedx = 0x%x\n", newthr->regs.edx); | |
| 552 print_debug("\tesp = 0x%x\n", newthr->regs.esp); | |
| 553 print_debug("\tebp = 0x%x\n", newthr->regs.ebp); | |
| 554 print_debug("\tesi = 0x%x\n", newthr->regs.esi); | |
| 555 print_debug("\tedi = 0x%x\n", newthr->regs.edi); | |
| 556 print_debug("\teip = 0x%x\n", newthr->regs.eip); | |
| 557 #endif | |
| 558 | |
| 559 #if defined(amd64) || defined(x86_64) | |
| 560 // print the regset | |
| 561 print_debug("\tr15 = 0x%lx\n", newthr->regs.r15); | |
| 562 print_debug("\tr14 = 0x%lx\n", newthr->regs.r14); | |
| 563 print_debug("\tr13 = 0x%lx\n", newthr->regs.r13); | |
| 564 print_debug("\tr12 = 0x%lx\n", newthr->regs.r12); | |
| 565 print_debug("\trbp = 0x%lx\n", newthr->regs.rbp); | |
| 566 print_debug("\trbx = 0x%lx\n", newthr->regs.rbx); | |
| 567 print_debug("\tr11 = 0x%lx\n", newthr->regs.r11); | |
| 568 print_debug("\tr10 = 0x%lx\n", newthr->regs.r10); | |
| 569 print_debug("\tr9 = 0x%lx\n", newthr->regs.r9); | |
| 570 print_debug("\tr8 = 0x%lx\n", newthr->regs.r8); | |
| 571 print_debug("\trax = 0x%lx\n", newthr->regs.rax); | |
| 572 print_debug("\trcx = 0x%lx\n", newthr->regs.rcx); | |
| 573 print_debug("\trdx = 0x%lx\n", newthr->regs.rdx); | |
| 574 print_debug("\trsi = 0x%lx\n", newthr->regs.rsi); | |
| 575 print_debug("\trdi = 0x%lx\n", newthr->regs.rdi); | |
| 576 print_debug("\torig_rax = 0x%lx\n", newthr->regs.orig_rax); | |
| 577 print_debug("\trip = 0x%lx\n", newthr->regs.rip); | |
| 578 print_debug("\tcs = 0x%lx\n", newthr->regs.cs); | |
| 579 print_debug("\teflags = 0x%lx\n", newthr->regs.eflags); | |
| 580 print_debug("\trsp = 0x%lx\n", newthr->regs.rsp); | |
| 581 print_debug("\tss = 0x%lx\n", newthr->regs.ss); | |
| 582 print_debug("\tfs_base = 0x%lx\n", newthr->regs.fs_base); | |
| 583 print_debug("\tgs_base = 0x%lx\n", newthr->regs.gs_base); | |
| 584 print_debug("\tds = 0x%lx\n", newthr->regs.ds); | |
| 585 print_debug("\tes = 0x%lx\n", newthr->regs.es); | |
| 586 print_debug("\tfs = 0x%lx\n", newthr->regs.fs); | |
| 587 print_debug("\tgs = 0x%lx\n", newthr->regs.gs); | |
| 588 #endif | |
| 589 } | |
| 590 | |
| 591 return true; | |
| 592 } | |
| 593 | |
| 594 #define ROUNDUP(x, y) ((((x)+((y)-1))/(y))*(y)) | |
| 595 | |
| 596 // read NT_PRSTATUS entries from core NOTE segment | |
| 597 static bool core_handle_note(struct ps_prochandle* ph, ELF_PHDR* note_phdr) { | |
| 598 char* buf = NULL; | |
| 599 char* p = NULL; | |
| 600 size_t size = note_phdr->p_filesz; | |
| 601 | |
| 602 // we are interested in just prstatus entries. we will ignore the rest. | |
| 603 // Advance the seek pointer to the start of the PT_NOTE data | |
| 604 if (lseek(ph->core->core_fd, note_phdr->p_offset, SEEK_SET) == (off_t)-1) { | |
| 605 print_debug("failed to lseek to PT_NOTE data\n"); | |
| 606 return false; | |
| 607 } | |
| 608 | |
| 609 // Now process the PT_NOTE structures. Each one is preceded by | |
| 610 // an Elf{32/64}_Nhdr structure describing its type and size. | |
| 611 if ( (buf = (char*) malloc(size)) == NULL) { | |
| 612 print_debug("can't allocate memory for reading core notes\n"); | |
| 613 goto err; | |
| 614 } | |
| 615 | |
| 616 // read notes into buffer | |
| 617 if (read(ph->core->core_fd, buf, size) != size) { | |
| 618 print_debug("failed to read notes, core file must have been truncated\n"); | |
| 619 goto err; | |
| 620 } | |
| 621 | |
| 622 p = buf; | |
| 623 while (p < buf + size) { | |
| 624 ELF_NHDR* notep = (ELF_NHDR*) p; | |
| 625 char* descdata = p + sizeof(ELF_NHDR) + ROUNDUP(notep->n_namesz, 4); | |
| 626 print_debug("Note header with n_type = %d and n_descsz = %u\n", | |
| 627 notep->n_type, notep->n_descsz); | |
| 628 | |
| 629 if (notep->n_type == NT_PRSTATUS) { | |
| 630 if (core_handle_prstatus(ph, descdata, notep->n_descsz) != true) | |
| 631 return false; | |
| 632 } | |
| 633 p = descdata + ROUNDUP(notep->n_descsz, 4); | |
| 634 } | |
| 635 | |
| 636 free(buf); | |
| 637 return true; | |
| 638 | |
| 639 err: | |
| 640 if (buf) free(buf); | |
| 641 return false; | |
| 642 } | |
| 643 | |
| 644 // read all segments from core file | |
| 645 static bool read_core_segments(struct ps_prochandle* ph, ELF_EHDR* core_ehdr) { | |
| 646 int i = 0; | |
| 647 ELF_PHDR* phbuf = NULL; | |
| 648 ELF_PHDR* core_php = NULL; | |
| 649 | |
| 650 if ((phbuf = read_program_header_table(ph->core->core_fd, core_ehdr)) == NULL) | |
| 651 return false; | |
| 652 | |
| 653 /* | |
| 654 * Now iterate through the program headers in the core file. | |
| 655 * We're interested in two types of Phdrs: PT_NOTE (which | |
| 656 * contains a set of saved /proc structures), and PT_LOAD (which | |
| 657 * represents a memory mapping from the process's address space). | |
| 658 * | |
| 659 * Difference b/w Solaris PT_NOTE and Linux PT_NOTE: | |
| 660 * | |
| 661 * In Solaris there are two PT_NOTE segments the first PT_NOTE (if present) | |
| 662 * contains /proc structs in the pre-2.6 unstructured /proc format. the last | |
| 663 * PT_NOTE has data in new /proc format. | |
| 664 * | |
| 665 * In Solaris, there is only one pstatus (process status). pstatus contains | |
| 666 * integer register set among other stuff. For each LWP, we have one lwpstatus | |
| 667 * entry that has integer regset for that LWP. | |
| 668 * | |
| 669 * Linux threads are actually 'clone'd processes. To support core analysis | |
| 670 * of "multithreaded" process, Linux creates more than one pstatus (called | |
| 671 * "prstatus") entry in PT_NOTE. Each prstatus entry has integer regset for one | |
| 672 * "thread". Please refer to Linux kernel src file 'fs/binfmt_elf.c', in particular | |
| 673 * function "elf_core_dump". | |
| 674 */ | |
| 675 | |
| 676 for (core_php = phbuf, i = 0; i < core_ehdr->e_phnum; i++) { | |
| 677 switch (core_php->p_type) { | |
| 678 case PT_NOTE: | |
| 679 if (core_handle_note(ph, core_php) != true) goto err; | |
| 680 break; | |
| 681 | |
| 682 case PT_LOAD: { | |
| 683 if (core_php->p_filesz != 0) { | |
| 684 if (add_map_info(ph, ph->core->core_fd, core_php->p_offset, | |
| 685 core_php->p_vaddr, core_php->p_filesz) == NULL) goto err; | |
| 686 } | |
| 687 break; | |
| 688 } | |
| 689 } | |
| 690 | |
| 691 core_php++; | |
| 692 } | |
| 693 | |
| 694 free(phbuf); | |
| 695 return true; | |
| 696 err: | |
| 697 free(phbuf); | |
| 698 return false; | |
| 699 } | |
| 700 | |
| 701 // read segments of a shared object | |
| 702 static bool read_lib_segments(struct ps_prochandle* ph, int lib_fd, ELF_EHDR* lib_ehdr, uintptr_t lib_base) { | |
| 703 int i = 0; | |
| 704 ELF_PHDR* phbuf; | |
| 705 ELF_PHDR* lib_php = NULL; | |
| 706 | |
| 707 if ((phbuf = read_program_header_table(lib_fd, lib_ehdr)) == NULL) | |
| 708 return false; | |
| 709 | |
| 710 // we want to process only PT_LOAD segments that are not writable. | |
| 711 // i.e., text segments. The read/write/exec (data) segments would | |
| 712 // have been already added from core file segments. | |
| 713 for (lib_php = phbuf, i = 0; i < lib_ehdr->e_phnum; i++) { | |
| 714 if ((lib_php->p_type == PT_LOAD) && !(lib_php->p_flags & PF_W) && (lib_php->p_filesz != 0)) { | |
| 715 if (add_map_info(ph, lib_fd, lib_php->p_offset, lib_php->p_vaddr + lib_base, lib_php->p_filesz) == NULL) | |
| 716 goto err; | |
| 717 } | |
| 718 lib_php++; | |
| 719 } | |
| 720 | |
| 721 free(phbuf); | |
| 722 return true; | |
| 723 err: | |
| 724 free(phbuf); | |
| 725 return false; | |
| 726 } | |
| 727 | |
| 728 // process segments from interpreter (ld.so or ld-linux.so) | |
| 729 static bool read_interp_segments(struct ps_prochandle* ph) { | |
| 730 ELF_EHDR interp_ehdr; | |
| 731 | |
| 732 if (read_elf_header(ph->core->interp_fd, &interp_ehdr) != true) { | |
| 733 print_debug("interpreter is not a valid ELF file\n"); | |
| 734 return false; | |
| 735 } | |
| 736 | |
| 737 if (read_lib_segments(ph, ph->core->interp_fd, &interp_ehdr, ph->core->ld_base_addr) != true) { | |
| 738 print_debug("can't read segments of interpreter\n"); | |
| 739 return false; | |
| 740 } | |
| 741 | |
| 742 return true; | |
| 743 } | |
| 744 | |
| 745 // process segments of a a.out | |
| 746 static bool read_exec_segments(struct ps_prochandle* ph, ELF_EHDR* exec_ehdr) { | |
| 747 int i = 0; | |
| 748 ELF_PHDR* phbuf = NULL; | |
| 749 ELF_PHDR* exec_php = NULL; | |
| 750 | |
| 751 if ((phbuf = read_program_header_table(ph->core->exec_fd, exec_ehdr)) == NULL) | |
| 752 return false; | |
| 753 | |
| 754 for (exec_php = phbuf, i = 0; i < exec_ehdr->e_phnum; i++) { | |
| 755 switch (exec_php->p_type) { | |
| 756 | |
| 757 // add mappings for PT_LOAD segments | |
| 758 case PT_LOAD: { | |
| 759 // add only non-writable segments of non-zero filesz | |
| 760 if (!(exec_php->p_flags & PF_W) && exec_php->p_filesz != 0) { | |
| 761 if (add_map_info(ph, ph->core->exec_fd, exec_php->p_offset, exec_php->p_vaddr, exec_php->p_filesz) == NULL) goto err; | |
| 762 } | |
| 763 break; | |
| 764 } | |
| 765 | |
| 766 // read the interpreter and it's segments | |
| 767 case PT_INTERP: { | |
| 768 char interp_name[BUF_SIZE]; | |
| 769 | |
| 770 pread(ph->core->exec_fd, interp_name, MIN(exec_php->p_filesz, BUF_SIZE), exec_php->p_offset); | |
| 771 print_debug("ELF interpreter %s\n", interp_name); | |
| 772 // read interpreter segments as well | |
| 773 if ((ph->core->interp_fd = pathmap_open(interp_name)) < 0) { | |
| 774 print_debug("can't open runtime loader\n"); | |
| 775 goto err; | |
| 776 } | |
| 777 break; | |
| 778 } | |
| 779 | |
| 780 // from PT_DYNAMIC we want to read address of first link_map addr | |
| 781 case PT_DYNAMIC: { | |
| 782 ph->core->dynamic_addr = exec_php->p_vaddr; | |
| 783 print_debug("address of _DYNAMIC is 0x%lx\n", ph->core->dynamic_addr); | |
| 784 break; | |
| 785 } | |
| 786 | |
| 787 } // switch | |
| 788 exec_php++; | |
| 789 } // for | |
| 790 | |
| 791 free(phbuf); | |
| 792 return true; | |
| 793 err: | |
| 794 free(phbuf); | |
| 795 return false; | |
| 796 } | |
| 797 | |
| 798 | |
| 799 #define FIRST_LINK_MAP_OFFSET offsetof(struct r_debug, r_map) | |
| 800 #define LD_BASE_OFFSET offsetof(struct r_debug, r_ldbase) | |
| 801 #define LINK_MAP_ADDR_OFFSET offsetof(struct link_map, l_addr) | |
| 802 #define LINK_MAP_NAME_OFFSET offsetof(struct link_map, l_name) | |
| 803 #define LINK_MAP_NEXT_OFFSET offsetof(struct link_map, l_next) | |
| 804 | |
| 805 // read shared library info from runtime linker's data structures. | |
| 806 // This work is done by librtlb_db in Solaris | |
| 807 static bool read_shared_lib_info(struct ps_prochandle* ph) { | |
| 808 uintptr_t addr = ph->core->dynamic_addr; | |
| 809 uintptr_t debug_base; | |
| 810 uintptr_t first_link_map_addr; | |
| 811 uintptr_t ld_base_addr; | |
| 812 uintptr_t link_map_addr; | |
| 813 uintptr_t lib_base_diff; | |
| 814 uintptr_t lib_base; | |
| 815 uintptr_t lib_name_addr; | |
| 816 char lib_name[BUF_SIZE]; | |
| 817 ELF_DYN dyn; | |
| 818 ELF_EHDR elf_ehdr; | |
| 819 int lib_fd; | |
| 820 | |
| 821 // _DYNAMIC has information of the form | |
| 822 // [tag] [data] [tag] [data] ..... | |
| 823 // Both tag and data are pointer sized. | |
| 824 // We look for dynamic info with DT_DEBUG. This has shared object info. | |
| 825 // refer to struct r_debug in link.h | |
| 826 | |
| 827 dyn.d_tag = DT_NULL; | |
| 828 while (dyn.d_tag != DT_DEBUG) { | |
| 829 if (ps_pdread(ph, (psaddr_t) addr, &dyn, sizeof(ELF_DYN)) != PS_OK) { | |
| 830 print_debug("can't read debug info from _DYNAMIC\n"); | |
| 831 return false; | |
| 832 } | |
| 833 addr += sizeof(ELF_DYN); | |
| 834 } | |
| 835 | |
| 836 // we have got Dyn entry with DT_DEBUG | |
| 837 debug_base = dyn.d_un.d_ptr; | |
| 838 // at debug_base we have struct r_debug. This has first link map in r_map field | |
| 839 if (ps_pdread(ph, (psaddr_t) debug_base + FIRST_LINK_MAP_OFFSET, | |
| 840 &first_link_map_addr, sizeof(uintptr_t)) != PS_OK) { | |
| 841 print_debug("can't read first link map address\n"); | |
| 842 return false; | |
| 843 } | |
| 844 | |
| 845 // read ld_base address from struct r_debug | |
| 846 if (ps_pdread(ph, (psaddr_t) debug_base + LD_BASE_OFFSET, &ld_base_addr, | |
| 847 sizeof(uintptr_t)) != PS_OK) { | |
| 848 print_debug("can't read ld base address\n"); | |
| 849 return false; | |
| 850 } | |
| 851 ph->core->ld_base_addr = ld_base_addr; | |
| 852 | |
| 853 print_debug("interpreter base address is 0x%lx\n", ld_base_addr); | |
| 854 | |
| 855 // now read segments from interp (i.e ld.so or ld-linux.so) | |
| 856 if (read_interp_segments(ph) != true) | |
| 857 return false; | |
| 858 | |
| 859 // after adding interpreter (ld.so) mappings sort again | |
| 860 if (sort_map_array(ph) != true) | |
| 861 return false; | |
| 862 | |
| 863 print_debug("first link map is at 0x%lx\n", first_link_map_addr); | |
| 864 | |
| 865 link_map_addr = first_link_map_addr; | |
| 866 while (link_map_addr != 0) { | |
| 867 // read library base address of the .so. Note that even though <sys/link.h> calls | |
| 868 // link_map->l_addr as "base address", this is * not * really base virtual | |
| 869 // address of the shared object. This is actually the difference b/w the virtual | |
| 870 // address mentioned in shared object and the actual virtual base where runtime | |
| 871 // linker loaded it. We use "base diff" in read_lib_segments call below. | |
| 872 | |
| 873 if (ps_pdread(ph, (psaddr_t) link_map_addr + LINK_MAP_ADDR_OFFSET, | |
| 874 &lib_base_diff, sizeof(uintptr_t)) != PS_OK) { | |
| 875 print_debug("can't read shared object base address diff\n"); | |
| 876 return false; | |
| 877 } | |
| 878 | |
| 879 // read address of the name | |
| 880 if (ps_pdread(ph, (psaddr_t) link_map_addr + LINK_MAP_NAME_OFFSET, | |
| 881 &lib_name_addr, sizeof(uintptr_t)) != PS_OK) { | |
| 882 print_debug("can't read address of shared object name\n"); | |
| 883 return false; | |
| 884 } | |
| 885 | |
| 886 // read name of the shared object | |
| 1385 | 887 lib_name[0] = '\0'; |
| 888 if (lib_name_addr != 0 && | |
| 889 read_string(ph, (uintptr_t) lib_name_addr, lib_name, sizeof(lib_name)) != true) { | |
| 0 | 890 print_debug("can't read shared object name\n"); |
| 1385 | 891 // don't let failure to read the name stop opening the file. If something is really wrong |
| 892 // it will fail later. | |
| 0 | 893 } |
| 894 | |
| 895 if (lib_name[0] != '\0') { | |
| 896 // ignore empty lib names | |
| 897 lib_fd = pathmap_open(lib_name); | |
| 898 | |
| 899 if (lib_fd < 0) { | |
| 900 print_debug("can't open shared object %s\n", lib_name); | |
| 901 // continue with other libraries... | |
| 902 } else { | |
| 903 if (read_elf_header(lib_fd, &elf_ehdr)) { | |
| 904 lib_base = lib_base_diff + find_base_address(lib_fd, &elf_ehdr); | |
| 905 print_debug("reading library %s @ 0x%lx [ 0x%lx ]\n", | |
| 906 lib_name, lib_base, lib_base_diff); | |
| 907 // while adding library mappings we need to use "base difference". | |
| 908 if (! read_lib_segments(ph, lib_fd, &elf_ehdr, lib_base_diff)) { | |
| 909 print_debug("can't read shared object's segments\n"); | |
| 910 close(lib_fd); | |
| 911 return false; | |
| 912 } | |
| 913 add_lib_info_fd(ph, lib_name, lib_fd, lib_base); | |
| 914 // Map info is added for the library (lib_name) so | |
| 915 // we need to re-sort it before calling the p_pdread. | |
| 916 if (sort_map_array(ph) != true) | |
| 917 return false; | |
| 918 } else { | |
| 919 print_debug("can't read ELF header for shared object %s\n", lib_name); | |
| 920 close(lib_fd); | |
| 921 // continue with other libraries... | |
| 922 } | |
| 923 } | |
| 924 } | |
| 925 | |
| 926 // read next link_map address | |
| 927 if (ps_pdread(ph, (psaddr_t) link_map_addr + LINK_MAP_NEXT_OFFSET, | |
| 928 &link_map_addr, sizeof(uintptr_t)) != PS_OK) { | |
| 929 print_debug("can't read next link in link_map\n"); | |
| 930 return false; | |
| 931 } | |
| 932 } | |
| 933 | |
| 934 return true; | |
| 935 } | |
| 936 | |
| 937 // the one and only one exposed stuff from this file | |
| 938 struct ps_prochandle* Pgrab_core(const char* exec_file, const char* core_file) { | |
| 939 ELF_EHDR core_ehdr; | |
| 940 ELF_EHDR exec_ehdr; | |
| 941 ELF_EHDR lib_ehdr; | |
| 942 | |
| 943 struct ps_prochandle* ph = (struct ps_prochandle*) calloc(1, sizeof(struct ps_prochandle)); | |
| 944 if (ph == NULL) { | |
| 945 print_debug("can't allocate ps_prochandle\n"); | |
| 946 return NULL; | |
| 947 } | |
| 948 | |
| 949 if ((ph->core = (struct core_data*) calloc(1, sizeof(struct core_data))) == NULL) { | |
| 950 free(ph); | |
| 951 print_debug("can't allocate ps_prochandle\n"); | |
| 952 return NULL; | |
| 953 } | |
| 954 | |
| 955 // initialize ph | |
| 956 ph->ops = &core_ops; | |
| 957 ph->core->core_fd = -1; | |
| 958 ph->core->exec_fd = -1; | |
| 959 ph->core->interp_fd = -1; | |
| 960 | |
| 961 // open the core file | |
| 962 if ((ph->core->core_fd = open(core_file, O_RDONLY)) < 0) { | |
| 963 print_debug("can't open core file\n"); | |
| 964 goto err; | |
| 965 } | |
| 966 | |
| 967 // read core file ELF header | |
| 968 if (read_elf_header(ph->core->core_fd, &core_ehdr) != true || core_ehdr.e_type != ET_CORE) { | |
| 969 print_debug("core file is not a valid ELF ET_CORE file\n"); | |
| 970 goto err; | |
| 971 } | |
| 972 | |
| 973 if ((ph->core->exec_fd = open(exec_file, O_RDONLY)) < 0) { | |
| 974 print_debug("can't open executable file\n"); | |
| 975 goto err; | |
| 976 } | |
| 977 | |
| 978 if (read_elf_header(ph->core->exec_fd, &exec_ehdr) != true || exec_ehdr.e_type != ET_EXEC) { | |
| 979 print_debug("executable file is not a valid ELF ET_EXEC file\n"); | |
| 980 goto err; | |
| 981 } | |
| 982 | |
| 983 // process core file segments | |
| 984 if (read_core_segments(ph, &core_ehdr) != true) | |
| 985 goto err; | |
| 986 | |
| 987 // process exec file segments | |
| 988 if (read_exec_segments(ph, &exec_ehdr) != true) | |
| 989 goto err; | |
| 990 | |
| 991 // exec file is also treated like a shared object for symbol search | |
| 992 if (add_lib_info_fd(ph, exec_file, ph->core->exec_fd, | |
| 993 (uintptr_t)0 + find_base_address(ph->core->exec_fd, &exec_ehdr)) == NULL) | |
| 994 goto err; | |
| 995 | |
| 996 // allocate and sort maps into map_array, we need to do this | |
| 997 // here because read_shared_lib_info needs to read from debuggee | |
| 998 // address space | |
| 999 if (sort_map_array(ph) != true) | |
| 1000 goto err; | |
| 1001 | |
| 1002 if (read_shared_lib_info(ph) != true) | |
| 1003 goto err; | |
| 1004 | |
| 1005 // sort again because we have added more mappings from shared objects | |
| 1006 if (sort_map_array(ph) != true) | |
| 1007 goto err; | |
| 1008 | |
| 1009 if (init_classsharing_workaround(ph) != true) | |
| 1010 goto err; | |
| 1011 | |
| 1012 return ph; | |
| 1013 | |
| 1014 err: | |
| 1015 Prelease(ph); | |
| 1016 return NULL; | |
| 1017 } |