Mercurial > hg > truffle
annotate agent/src/os/bsd/ps_core.c @ 20888:0f3d81231ecb
Truffle/Instrumentation: Javadoc
author | Michael Van De Vanter <michael.van.de.vanter@oracle.com> |
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date | Fri, 10 Apr 2015 17:56:10 -0700 |
parents | 5705c7ee6dd7 |
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rev | line source |
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3960 | 1 /* |
8750 | 2 * Copyright (c) 2003, 2013, Oracle and/or its affiliates. All rights reserved. |
3960 | 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 * | |
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
20 * or visit www.oracle.com if you need additional information or have any | |
21 * questions. | |
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 "libproc_impl.h" | |
8750 | 32 |
33 #ifdef __APPLE__ | |
34 #include "sun_jvm_hotspot_debugger_amd64_AMD64ThreadContext.h" | |
35 #endif | |
3960 | 36 |
37 // This file has the libproc implementation to read core files. | |
38 // For live processes, refer to ps_proc.c. Portions of this is adapted | |
39 // /modelled after Solaris libproc.so (in particular Pcore.c) | |
40 | |
41 //---------------------------------------------------------------------- | |
42 // ps_prochandle cleanup helper functions | |
43 | |
44 // close all file descriptors | |
8750 | 45 static void close_files(struct ps_prochandle* ph) { |
46 lib_info* lib = NULL; | |
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47 |
8750 | 48 // close core file descriptor |
49 if (ph->core->core_fd >= 0) | |
50 close(ph->core->core_fd); | |
3960 | 51 |
8750 | 52 // close exec file descriptor |
53 if (ph->core->exec_fd >= 0) | |
54 close(ph->core->exec_fd); | |
3960 | 55 |
8750 | 56 // close interp file descriptor |
57 if (ph->core->interp_fd >= 0) | |
58 close(ph->core->interp_fd); | |
3960 | 59 |
8750 | 60 // close class share archive file |
61 if (ph->core->classes_jsa_fd >= 0) | |
62 close(ph->core->classes_jsa_fd); | |
3960 | 63 |
8750 | 64 // close all library file descriptors |
65 lib = ph->libs; | |
66 while (lib) { | |
67 int fd = lib->fd; | |
68 if (fd >= 0 && fd != ph->core->exec_fd) { | |
69 close(fd); | |
70 } | |
71 lib = lib->next; | |
72 } | |
3960 | 73 } |
74 | |
75 // clean all map_info stuff | |
76 static void destroy_map_info(struct ps_prochandle* ph) { | |
77 map_info* map = ph->core->maps; | |
78 while (map) { | |
8750 | 79 map_info* next = map->next; |
80 free(map); | |
81 map = next; | |
3960 | 82 } |
83 | |
84 if (ph->core->map_array) { | |
8750 | 85 free(ph->core->map_array); |
3960 | 86 } |
87 | |
88 // Part of the class sharing workaround | |
89 map = ph->core->class_share_maps; | |
90 while (map) { | |
8750 | 91 map_info* next = map->next; |
92 free(map); | |
93 map = next; | |
3960 | 94 } |
95 } | |
96 | |
97 // ps_prochandle operations | |
98 static void core_release(struct ps_prochandle* ph) { | |
8750 | 99 if (ph->core) { |
100 close_files(ph); | |
101 destroy_map_info(ph); | |
102 free(ph->core); | |
103 } | |
3960 | 104 } |
105 | |
106 static map_info* allocate_init_map(int fd, off_t offset, uintptr_t vaddr, size_t memsz) { | |
8750 | 107 map_info* map; |
108 if ( (map = (map_info*) calloc(1, sizeof(map_info))) == NULL) { | |
109 print_debug("can't allocate memory for map_info\n"); | |
110 return NULL; | |
111 } | |
3960 | 112 |
8750 | 113 // initialize map |
114 map->fd = fd; | |
115 map->offset = offset; | |
116 map->vaddr = vaddr; | |
117 map->memsz = memsz; | |
118 return map; | |
3960 | 119 } |
120 | |
121 // add map info with given fd, offset, vaddr and memsz | |
122 static map_info* add_map_info(struct ps_prochandle* ph, int fd, off_t offset, | |
123 uintptr_t vaddr, size_t memsz) { | |
8750 | 124 map_info* map; |
125 if ((map = allocate_init_map(fd, offset, vaddr, memsz)) == NULL) { | |
126 return NULL; | |
127 } | |
3960 | 128 |
8750 | 129 // add this to map list |
130 map->next = ph->core->maps; | |
131 ph->core->maps = map; | |
132 ph->core->num_maps++; | |
3960 | 133 |
8750 | 134 return map; |
3960 | 135 } |
136 | |
137 // Part of the class sharing workaround | |
138 static map_info* add_class_share_map_info(struct ps_prochandle* ph, off_t offset, | |
139 uintptr_t vaddr, size_t memsz) { | |
8750 | 140 map_info* map; |
141 if ((map = allocate_init_map(ph->core->classes_jsa_fd, | |
142 offset, vaddr, memsz)) == NULL) { | |
143 return NULL; | |
144 } | |
3960 | 145 |
8750 | 146 map->next = ph->core->class_share_maps; |
147 ph->core->class_share_maps = map; | |
148 return map; | |
3960 | 149 } |
150 | |
151 // Return the map_info for the given virtual address. We keep a sorted | |
152 // array of pointers in ph->map_array, so we can binary search. | |
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153 static map_info* core_lookup(struct ps_prochandle *ph, uintptr_t addr) { |
8750 | 154 int mid, lo = 0, hi = ph->core->num_maps - 1; |
155 map_info *mp; | |
3960 | 156 |
8750 | 157 while (hi - lo > 1) { |
158 mid = (lo + hi) / 2; | |
159 if (addr >= ph->core->map_array[mid]->vaddr) { | |
160 lo = mid; | |
161 } else { | |
162 hi = mid; | |
163 } | |
164 } | |
3960 | 165 |
8750 | 166 if (addr < ph->core->map_array[hi]->vaddr) { |
167 mp = ph->core->map_array[lo]; | |
168 } else { | |
169 mp = ph->core->map_array[hi]; | |
170 } | |
3960 | 171 |
8750 | 172 if (addr >= mp->vaddr && addr < mp->vaddr + mp->memsz) { |
173 return (mp); | |
174 } | |
3960 | 175 |
176 | |
8750 | 177 // Part of the class sharing workaround |
178 // Unfortunately, we have no way of detecting -Xshare state. | |
179 // Check out the share maps atlast, if we don't find anywhere. | |
180 // This is done this way so to avoid reading share pages | |
181 // ahead of other normal maps. For eg. with -Xshare:off we don't | |
182 // want to prefer class sharing data to data from core. | |
183 mp = ph->core->class_share_maps; | |
184 if (mp) { | |
185 print_debug("can't locate map_info at 0x%lx, trying class share maps\n", addr); | |
186 } | |
187 while (mp) { | |
188 if (addr >= mp->vaddr && addr < mp->vaddr + mp->memsz) { | |
189 print_debug("located map_info at 0x%lx from class share maps\n", addr); | |
190 return (mp); | |
191 } | |
192 mp = mp->next; | |
193 } | |
3960 | 194 |
8750 | 195 print_debug("can't locate map_info at 0x%lx\n", addr); |
196 return (NULL); | |
3960 | 197 } |
198 | |
199 //--------------------------------------------------------------- | |
200 // Part of the class sharing workaround: | |
201 // | |
10229 | 202 // With class sharing, pages are mapped from classes.jsa file. |
3960 | 203 // The read-only class sharing pages are mapped as MAP_SHARED, |
204 // PROT_READ pages. These pages are not dumped into core dump. | |
10229 | 205 // With this workaround, these pages are read from classes.jsa. |
3960 | 206 |
207 // FIXME: !HACK ALERT! | |
208 // The format of sharing achive file header is needed to read shared heap | |
209 // file mappings. For now, I am hard coding portion of FileMapHeader here. | |
210 // Refer to filemap.hpp. | |
211 | |
212 // FileMapHeader describes the shared space data in the file to be | |
213 // mapped. This structure gets written to a file. It is not a class, | |
214 // so that the compilers don't add any compiler-private data to it. | |
215 | |
216 #define NUM_SHARED_MAPS 4 | |
217 | |
218 // Refer to FileMapInfo::_current_version in filemap.hpp | |
219 #define CURRENT_ARCHIVE_VERSION 1 | |
220 | |
221 struct FileMapHeader { | |
222 int _magic; // identify file type. | |
223 int _version; // (from enum, above.) | |
224 size_t _alignment; // how shared archive should be aligned | |
225 | |
226 struct space_info { | |
227 int _file_offset; // sizeof(this) rounded to vm page size | |
228 char* _base; // copy-on-write base address | |
229 size_t _capacity; // for validity checking | |
230 size_t _used; // for setting space top on read | |
231 | |
232 // 4991491 NOTICE These are C++ bool's in filemap.hpp and must match up with | |
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233 // the C type matching the C++ bool type on any given platform. |
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234 // We assume the corresponding C type is char but licensees |
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235 // may need to adjust the type of these fields. |
3960 | 236 char _read_only; // read only space? |
237 char _allow_exec; // executable code in space? | |
238 | |
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239 } _space[NUM_SHARED_MAPS]; |
3960 | 240 |
241 // Ignore the rest of the FileMapHeader. We don't need those fields here. | |
242 }; | |
243 | |
244 static bool read_jboolean(struct ps_prochandle* ph, uintptr_t addr, jboolean* pvalue) { | |
8750 | 245 jboolean i; |
246 if (ps_pread(ph, (psaddr_t) addr, &i, sizeof(i)) == PS_OK) { | |
247 *pvalue = i; | |
248 return true; | |
249 } else { | |
250 return false; | |
251 } | |
3960 | 252 } |
253 | |
254 static bool read_pointer(struct ps_prochandle* ph, uintptr_t addr, uintptr_t* pvalue) { | |
8750 | 255 uintptr_t uip; |
256 if (ps_pread(ph, (psaddr_t) addr, (char *)&uip, sizeof(uip)) == PS_OK) { | |
257 *pvalue = uip; | |
258 return true; | |
259 } else { | |
260 return false; | |
261 } | |
3960 | 262 } |
263 | |
264 // used to read strings from debuggee | |
265 static bool read_string(struct ps_prochandle* ph, uintptr_t addr, char* buf, size_t size) { | |
8750 | 266 size_t i = 0; |
267 char c = ' '; | |
3960 | 268 |
8750 | 269 while (c != '\0') { |
270 if (ps_pread(ph, (psaddr_t) addr, &c, sizeof(char)) != PS_OK) { | |
271 return false; | |
272 } | |
273 if (i < size - 1) { | |
274 buf[i] = c; | |
275 } else { | |
276 // smaller buffer | |
277 return false; | |
278 } | |
279 i++; addr++; | |
280 } | |
281 buf[i] = '\0'; | |
282 return true; | |
3960 | 283 } |
284 | |
8750 | 285 #ifdef __APPLE__ |
286 #define USE_SHARED_SPACES_SYM "_UseSharedSpaces" | |
287 // mangled name of Arguments::SharedArchivePath | |
288 #define SHARED_ARCHIVE_PATH_SYM "_ZN9Arguments17SharedArchivePathE" | |
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289 #define LIBJVM_NAME "/libjvm.dylib" |
8750 | 290 #else |
3960 | 291 #define USE_SHARED_SPACES_SYM "UseSharedSpaces" |
292 // mangled name of Arguments::SharedArchivePath | |
8750 | 293 #define SHARED_ARCHIVE_PATH_SYM "__ZN9Arguments17SharedArchivePathE" |
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294 #define LIBJVM_NAME "/libjvm.so" |
8750 | 295 #endif // __APPLE_ |
3960 | 296 |
297 static bool init_classsharing_workaround(struct ps_prochandle* ph) { | |
8750 | 298 int m; |
299 size_t n; | |
300 lib_info* lib = ph->libs; | |
301 while (lib != NULL) { | |
302 // we are iterating over shared objects from the core dump. look for | |
10229 | 303 // libjvm.so. |
8750 | 304 const char *jvm_name = 0; |
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305 if ((jvm_name = strstr(lib->name, LIBJVM_NAME)) != 0) { |
8750 | 306 char classes_jsa[PATH_MAX]; |
307 struct FileMapHeader header; | |
308 int fd = -1; | |
309 uintptr_t base = 0, useSharedSpacesAddr = 0; | |
310 uintptr_t sharedArchivePathAddrAddr = 0, sharedArchivePathAddr = 0; | |
311 jboolean useSharedSpaces = 0; | |
3960 | 312 |
8750 | 313 memset(classes_jsa, 0, sizeof(classes_jsa)); |
314 jvm_name = lib->name; | |
315 useSharedSpacesAddr = lookup_symbol(ph, jvm_name, USE_SHARED_SPACES_SYM); | |
316 if (useSharedSpacesAddr == 0) { | |
317 print_debug("can't lookup 'UseSharedSpaces' flag\n"); | |
318 return false; | |
319 } | |
3960 | 320 |
8750 | 321 // Hotspot vm types are not exported to build this library. So |
322 // using equivalent type jboolean to read the value of | |
323 // UseSharedSpaces which is same as hotspot type "bool". | |
324 if (read_jboolean(ph, useSharedSpacesAddr, &useSharedSpaces) != true) { | |
325 print_debug("can't read the value of 'UseSharedSpaces' flag\n"); | |
326 return false; | |
327 } | |
3960 | 328 |
8750 | 329 if ((int)useSharedSpaces == 0) { |
330 print_debug("UseSharedSpaces is false, assuming -Xshare:off!\n"); | |
331 return true; | |
332 } | |
3960 | 333 |
8750 | 334 sharedArchivePathAddrAddr = lookup_symbol(ph, jvm_name, SHARED_ARCHIVE_PATH_SYM); |
335 if (sharedArchivePathAddrAddr == 0) { | |
336 print_debug("can't lookup shared archive path symbol\n"); | |
337 return false; | |
338 } | |
3960 | 339 |
8750 | 340 if (read_pointer(ph, sharedArchivePathAddrAddr, &sharedArchivePathAddr) != true) { |
341 print_debug("can't read shared archive path pointer\n"); | |
342 return false; | |
343 } | |
3960 | 344 |
8750 | 345 if (read_string(ph, sharedArchivePathAddr, classes_jsa, sizeof(classes_jsa)) != true) { |
346 print_debug("can't read shared archive path value\n"); | |
347 return false; | |
348 } | |
3960 | 349 |
8750 | 350 print_debug("looking for %s\n", classes_jsa); |
351 // open the class sharing archive file | |
352 fd = pathmap_open(classes_jsa); | |
353 if (fd < 0) { | |
354 print_debug("can't open %s!\n", classes_jsa); | |
355 ph->core->classes_jsa_fd = -1; | |
356 return false; | |
357 } else { | |
358 print_debug("opened %s\n", classes_jsa); | |
359 } | |
3960 | 360 |
8750 | 361 // read FileMapHeader from the file |
362 memset(&header, 0, sizeof(struct FileMapHeader)); | |
363 if ((n = read(fd, &header, sizeof(struct FileMapHeader))) | |
364 != sizeof(struct FileMapHeader)) { | |
365 print_debug("can't read shared archive file map header from %s\n", classes_jsa); | |
366 close(fd); | |
367 return false; | |
368 } | |
3960 | 369 |
8750 | 370 // check file magic |
371 if (header._magic != 0xf00baba2) { | |
372 print_debug("%s has bad shared archive file magic number 0x%x, expecing 0xf00baba2\n", | |
373 classes_jsa, header._magic); | |
374 close(fd); | |
375 return false; | |
376 } | |
377 | |
378 // check version | |
379 if (header._version != CURRENT_ARCHIVE_VERSION) { | |
380 print_debug("%s has wrong shared archive file version %d, expecting %d\n", | |
381 classes_jsa, header._version, CURRENT_ARCHIVE_VERSION); | |
382 close(fd); | |
383 return false; | |
384 } | |
3960 | 385 |
8750 | 386 ph->core->classes_jsa_fd = fd; |
10229 | 387 // add read-only maps from classes.jsa to the list of maps |
8750 | 388 for (m = 0; m < NUM_SHARED_MAPS; m++) { |
389 if (header._space[m]._read_only) { | |
390 base = (uintptr_t) header._space[m]._base; | |
391 // no need to worry about the fractional pages at-the-end. | |
392 // possible fractional pages are handled by core_read_data. | |
393 add_class_share_map_info(ph, (off_t) header._space[m]._file_offset, | |
394 base, (size_t) header._space[m]._used); | |
395 print_debug("added a share archive map at 0x%lx\n", base); | |
396 } | |
3960 | 397 } |
8750 | 398 return true; |
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399 } |
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400 lib = lib->next; |
8750 | 401 } |
402 return true; | |
3960 | 403 } |
404 | |
405 //--------------------------------------------------------------------------- | |
406 // functions to handle map_info | |
407 | |
408 // Order mappings based on virtual address. We use this function as the | |
409 // callback for sorting the array of map_info pointers. | |
410 static int core_cmp_mapping(const void *lhsp, const void *rhsp) | |
411 { | |
8750 | 412 const map_info *lhs = *((const map_info **)lhsp); |
413 const map_info *rhs = *((const map_info **)rhsp); | |
3960 | 414 |
8750 | 415 if (lhs->vaddr == rhs->vaddr) { |
416 return (0); | |
417 } | |
3960 | 418 |
8750 | 419 return (lhs->vaddr < rhs->vaddr ? -1 : 1); |
3960 | 420 } |
421 | |
422 // we sort map_info by starting virtual address so that we can do | |
423 // binary search to read from an address. | |
424 static bool sort_map_array(struct ps_prochandle* ph) { | |
8750 | 425 size_t num_maps = ph->core->num_maps; |
426 map_info* map = ph->core->maps; | |
427 int i = 0; | |
3960 | 428 |
8750 | 429 // allocate map_array |
430 map_info** array; | |
431 if ( (array = (map_info**) malloc(sizeof(map_info*) * num_maps)) == NULL) { | |
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432 print_debug("can't allocate memory for map array\n"); |
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433 return false; |
8750 | 434 } |
3960 | 435 |
8750 | 436 // add maps to array |
437 while (map) { | |
438 array[i] = map; | |
439 i++; | |
440 map = map->next; | |
441 } | |
3960 | 442 |
8750 | 443 // sort is called twice. If this is second time, clear map array |
444 if (ph->core->map_array) { | |
445 free(ph->core->map_array); | |
446 } | |
447 ph->core->map_array = array; | |
448 // sort the map_info array by base virtual address. | |
449 qsort(ph->core->map_array, ph->core->num_maps, sizeof (map_info*), | |
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450 core_cmp_mapping); |
3960 | 451 |
8750 | 452 // print map |
453 if (is_debug()) { | |
454 int j = 0; | |
455 print_debug("---- sorted virtual address map ----\n"); | |
456 for (j = 0; j < ph->core->num_maps; j++) { | |
457 print_debug("base = 0x%lx\tsize = %d\n", ph->core->map_array[j]->vaddr, | |
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458 ph->core->map_array[j]->memsz); |
8750 | 459 } |
460 } | |
3960 | 461 |
8750 | 462 return true; |
3960 | 463 } |
464 | |
465 #ifndef MIN | |
466 #define MIN(x, y) (((x) < (y))? (x): (y)) | |
467 #endif | |
468 | |
469 static bool core_read_data(struct ps_prochandle* ph, uintptr_t addr, char *buf, size_t size) { | |
470 ssize_t resid = size; | |
471 int page_size=sysconf(_SC_PAGE_SIZE); | |
472 while (resid != 0) { | |
473 map_info *mp = core_lookup(ph, addr); | |
474 uintptr_t mapoff; | |
475 ssize_t len, rem; | |
476 off_t off; | |
477 int fd; | |
478 | |
8750 | 479 if (mp == NULL) { |
3960 | 480 break; /* No mapping for this address */ |
8750 | 481 } |
3960 | 482 |
483 fd = mp->fd; | |
484 mapoff = addr - mp->vaddr; | |
485 len = MIN(resid, mp->memsz - mapoff); | |
486 off = mp->offset + mapoff; | |
487 | |
8750 | 488 if ((len = pread(fd, buf, len, off)) <= 0) { |
3960 | 489 break; |
8750 | 490 } |
3960 | 491 |
492 resid -= len; | |
493 addr += len; | |
494 buf = (char *)buf + len; | |
495 | |
496 // mappings always start at page boundary. But, may end in fractional | |
497 // page. fill zeros for possible fractional page at the end of a mapping. | |
498 rem = mp->memsz % page_size; | |
499 if (rem > 0) { | |
500 rem = page_size - rem; | |
501 len = MIN(resid, rem); | |
502 resid -= len; | |
503 addr += len; | |
504 // we are not assuming 'buf' to be zero initialized. | |
505 memset(buf, 0, len); | |
506 buf += len; | |
507 } | |
508 } | |
509 | |
510 if (resid) { | |
511 print_debug("core read failed for %d byte(s) @ 0x%lx (%d more bytes)\n", | |
512 size, addr, resid); | |
513 return false; | |
514 } else { | |
515 return true; | |
516 } | |
517 } | |
518 | |
519 // null implementation for write | |
520 static bool core_write_data(struct ps_prochandle* ph, | |
521 uintptr_t addr, const char *buf , size_t size) { | |
522 return false; | |
523 } | |
524 | |
525 static bool core_get_lwp_regs(struct ps_prochandle* ph, lwpid_t lwp_id, | |
526 struct reg* regs) { | |
8750 | 527 // for core we have cached the lwp regs after segment parsed |
528 sa_thread_info* thr = ph->threads; | |
3960 | 529 while (thr) { |
530 if (thr->lwp_id == lwp_id) { | |
531 memcpy(regs, &thr->regs, sizeof(struct reg)); | |
532 return true; | |
533 } | |
534 thr = thr->next; | |
535 } | |
536 return false; | |
537 } | |
538 | |
8750 | 539 static bool core_get_lwp_info(struct ps_prochandle *ph, lwpid_t id, void *info) { |
3960 | 540 print_debug("core_get_lwp_info not implemented\n"); |
541 return false; | |
542 } | |
543 | |
544 static ps_prochandle_ops core_ops = { | |
545 .release= core_release, | |
546 .p_pread= core_read_data, | |
547 .p_pwrite= core_write_data, | |
548 .get_lwp_regs= core_get_lwp_regs, | |
549 .get_lwp_info= core_get_lwp_info | |
550 }; | |
551 | |
8750 | 552 // from this point, mainly two blocks divided by def __APPLE__ |
553 // one for Macosx, the other for regular Bsd | |
554 | |
555 #ifdef __APPLE__ | |
556 | |
557 void print_thread(sa_thread_info *threadinfo) { | |
558 print_debug("thread added: %d\n", threadinfo->lwp_id); | |
559 print_debug("registers:\n"); | |
560 print_debug(" r_r15: 0x%" PRIx64 "\n", threadinfo->regs.r_r15); | |
561 print_debug(" r_r14: 0x%" PRIx64 "\n", threadinfo->regs.r_r14); | |
562 print_debug(" r_r13: 0x%" PRIx64 "\n", threadinfo->regs.r_r13); | |
563 print_debug(" r_r12: 0x%" PRIx64 "\n", threadinfo->regs.r_r12); | |
564 print_debug(" r_r11: 0x%" PRIx64 "\n", threadinfo->regs.r_r11); | |
565 print_debug(" r_r10: 0x%" PRIx64 "\n", threadinfo->regs.r_r10); | |
566 print_debug(" r_r9: 0x%" PRIx64 "\n", threadinfo->regs.r_r9); | |
567 print_debug(" r_r8: 0x%" PRIx64 "\n", threadinfo->regs.r_r8); | |
568 print_debug(" r_rdi: 0x%" PRIx64 "\n", threadinfo->regs.r_rdi); | |
569 print_debug(" r_rsi: 0x%" PRIx64 "\n", threadinfo->regs.r_rsi); | |
570 print_debug(" r_rbp: 0x%" PRIx64 "\n", threadinfo->regs.r_rbp); | |
571 print_debug(" r_rbx: 0x%" PRIx64 "\n", threadinfo->regs.r_rbx); | |
572 print_debug(" r_rdx: 0x%" PRIx64 "\n", threadinfo->regs.r_rdx); | |
573 print_debug(" r_rcx: 0x%" PRIx64 "\n", threadinfo->regs.r_rcx); | |
574 print_debug(" r_rax: 0x%" PRIx64 "\n", threadinfo->regs.r_rax); | |
575 print_debug(" r_fs: 0x%" PRIx32 "\n", threadinfo->regs.r_fs); | |
576 print_debug(" r_gs: 0x%" PRIx32 "\n", threadinfo->regs.r_gs); | |
577 print_debug(" r_rip 0x%" PRIx64 "\n", threadinfo->regs.r_rip); | |
578 print_debug(" r_cs: 0x%" PRIx64 "\n", threadinfo->regs.r_cs); | |
579 print_debug(" r_rsp: 0x%" PRIx64 "\n", threadinfo->regs.r_rsp); | |
580 print_debug(" r_rflags: 0x%" PRIx64 "\n", threadinfo->regs.r_rflags); | |
581 } | |
582 | |
583 // read all segments64 commands from core file | |
584 // read all thread commands from core file | |
585 static bool read_core_segments(struct ps_prochandle* ph) { | |
586 int i = 0; | |
587 int num_threads = 0; | |
588 int fd = ph->core->core_fd; | |
589 off_t offset = 0; | |
590 mach_header_64 fhead; | |
591 load_command lcmd; | |
592 segment_command_64 segcmd; | |
593 // thread_command thrcmd; | |
594 | |
595 lseek(fd, offset, SEEK_SET); | |
596 if(read(fd, (void *)&fhead, sizeof(mach_header_64)) != sizeof(mach_header_64)) { | |
597 goto err; | |
598 } | |
599 print_debug("total commands: %d\n", fhead.ncmds); | |
600 offset += sizeof(mach_header_64); | |
601 for (i = 0; i < fhead.ncmds; i++) { | |
602 lseek(fd, offset, SEEK_SET); | |
603 if (read(fd, (void *)&lcmd, sizeof(load_command)) != sizeof(load_command)) { | |
604 goto err; | |
605 } | |
606 offset += lcmd.cmdsize; // next command position | |
607 if (lcmd.cmd == LC_SEGMENT_64) { | |
608 lseek(fd, -sizeof(load_command), SEEK_CUR); | |
609 if (read(fd, (void *)&segcmd, sizeof(segment_command_64)) != sizeof(segment_command_64)) { | |
610 print_debug("failed to read LC_SEGMENT_64 i = %d!\n", i); | |
611 goto err; | |
612 } | |
613 if (add_map_info(ph, fd, segcmd.fileoff, segcmd.vmaddr, segcmd.vmsize) == NULL) { | |
614 print_debug("Failed to add map_info at i = %d\n", i); | |
615 goto err; | |
616 } | |
617 print_debug("segment added: %" PRIu64 " 0x%" PRIx64 " %d\n", | |
618 segcmd.fileoff, segcmd.vmaddr, segcmd.vmsize); | |
619 } else if (lcmd.cmd == LC_THREAD || lcmd.cmd == LC_UNIXTHREAD) { | |
620 typedef struct thread_fc { | |
621 uint32_t flavor; | |
622 uint32_t count; | |
623 } thread_fc; | |
624 thread_fc fc; | |
625 uint32_t size = sizeof(load_command); | |
626 while (size < lcmd.cmdsize) { | |
627 if (read(fd, (void *)&fc, sizeof(thread_fc)) != sizeof(thread_fc)) { | |
628 printf("Reading flavor, count failed.\n"); | |
629 goto err; | |
630 } | |
631 size += sizeof(thread_fc); | |
632 if (fc.flavor == x86_THREAD_STATE) { | |
633 x86_thread_state_t thrstate; | |
634 if (read(fd, (void *)&thrstate, sizeof(x86_thread_state_t)) != sizeof(x86_thread_state_t)) { | |
635 printf("Reading flavor, count failed.\n"); | |
636 goto err; | |
637 } | |
638 size += sizeof(x86_thread_state_t); | |
639 // create thread info list, update lwp_id later | |
640 sa_thread_info* newthr = add_thread_info(ph, (pthread_t) -1, (lwpid_t) num_threads++); | |
641 if (newthr == NULL) { | |
642 printf("create thread_info failed\n"); | |
643 goto err; | |
644 } | |
645 | |
646 // note __DARWIN_UNIX03 depengs on other definitions | |
647 #if __DARWIN_UNIX03 | |
648 #define get_register_v(regst, regname) \ | |
649 regst.uts.ts64.__##regname | |
650 #else | |
651 #define get_register_v(regst, regname) \ | |
652 regst.uts.ts64.##regname | |
653 #endif // __DARWIN_UNIX03 | |
654 newthr->regs.r_rax = get_register_v(thrstate, rax); | |
655 newthr->regs.r_rbx = get_register_v(thrstate, rbx); | |
656 newthr->regs.r_rcx = get_register_v(thrstate, rcx); | |
657 newthr->regs.r_rdx = get_register_v(thrstate, rdx); | |
658 newthr->regs.r_rdi = get_register_v(thrstate, rdi); | |
659 newthr->regs.r_rsi = get_register_v(thrstate, rsi); | |
660 newthr->regs.r_rbp = get_register_v(thrstate, rbp); | |
661 newthr->regs.r_rsp = get_register_v(thrstate, rsp); | |
662 newthr->regs.r_r8 = get_register_v(thrstate, r8); | |
663 newthr->regs.r_r9 = get_register_v(thrstate, r9); | |
664 newthr->regs.r_r10 = get_register_v(thrstate, r10); | |
665 newthr->regs.r_r11 = get_register_v(thrstate, r11); | |
666 newthr->regs.r_r12 = get_register_v(thrstate, r12); | |
667 newthr->regs.r_r13 = get_register_v(thrstate, r13); | |
668 newthr->regs.r_r14 = get_register_v(thrstate, r14); | |
669 newthr->regs.r_r15 = get_register_v(thrstate, r15); | |
670 newthr->regs.r_rip = get_register_v(thrstate, rip); | |
671 newthr->regs.r_rflags = get_register_v(thrstate, rflags); | |
672 newthr->regs.r_cs = get_register_v(thrstate, cs); | |
673 newthr->regs.r_fs = get_register_v(thrstate, fs); | |
674 newthr->regs.r_gs = get_register_v(thrstate, gs); | |
675 print_thread(newthr); | |
676 } else if (fc.flavor == x86_FLOAT_STATE) { | |
677 x86_float_state_t flstate; | |
678 if (read(fd, (void *)&flstate, sizeof(x86_float_state_t)) != sizeof(x86_float_state_t)) { | |
679 print_debug("Reading flavor, count failed.\n"); | |
680 goto err; | |
681 } | |
682 size += sizeof(x86_float_state_t); | |
683 } else if (fc.flavor == x86_EXCEPTION_STATE) { | |
684 x86_exception_state_t excpstate; | |
685 if (read(fd, (void *)&excpstate, sizeof(x86_exception_state_t)) != sizeof(x86_exception_state_t)) { | |
686 printf("Reading flavor, count failed.\n"); | |
687 goto err; | |
688 } | |
689 size += sizeof(x86_exception_state_t); | |
690 } | |
691 } | |
692 } | |
693 } | |
694 return true; | |
695 err: | |
696 return false; | |
697 } | |
698 | |
699 /**local function **/ | |
700 bool exists(const char *fname) | |
701 { | |
702 int fd; | |
703 if ((fd = open(fname, O_RDONLY)) > 0) { | |
704 close(fd); | |
705 return true; | |
706 } | |
707 return false; | |
708 } | |
709 | |
710 // we check: 1. lib | |
711 // 2. lib/server | |
712 // 3. jre/lib | |
713 // 4. jre/lib/server | |
714 // from: 1. exe path | |
715 // 2. JAVA_HOME | |
716 // 3. DYLD_LIBRARY_PATH | |
717 static bool get_real_path(struct ps_prochandle* ph, char *rpath) { | |
718 /** check if they exist in JAVA ***/ | |
719 char* execname = ph->core->exec_path; | |
720 char filepath[4096]; | |
721 char* filename = strrchr(rpath, '/'); // like /libjvm.dylib | |
722 if (filename == NULL) { | |
723 return false; | |
724 } | |
725 | |
726 char* posbin = strstr(execname, "/bin/java"); | |
727 if (posbin != NULL) { | |
728 memcpy(filepath, execname, posbin - execname); // not include trailing '/' | |
729 filepath[posbin - execname] = '\0'; | |
730 } else { | |
731 char* java_home = getenv("JAVA_HOME"); | |
732 if (java_home != NULL) { | |
733 strcpy(filepath, java_home); | |
734 } else { | |
735 char* dyldpath = getenv("DYLD_LIBRARY_PATH"); | |
736 char* dypath = strtok(dyldpath, ":"); | |
737 while (dypath != NULL) { | |
738 strcpy(filepath, dypath); | |
739 strcat(filepath, filename); | |
740 if (exists(filepath)) { | |
741 strcpy(rpath, filepath); | |
742 return true; | |
743 } | |
744 dypath = strtok(dyldpath, ":"); | |
745 } | |
746 // not found | |
747 return false; | |
748 } | |
749 } | |
750 // for exec and java_home, jdkpath now is filepath | |
751 size_t filepath_base_size = strlen(filepath); | |
752 | |
753 // first try /lib/ and /lib/server | |
754 strcat(filepath, "/lib"); | |
755 strcat(filepath, filename); | |
756 if (exists(filepath)) { | |
757 strcpy(rpath, filepath); | |
758 return true; | |
759 } | |
760 char* pos = strstr(filepath, filename); // like /libjvm.dylib | |
761 *pos = '\0'; | |
762 strcat(filepath, "/server"); | |
763 strcat(filepath, filename); | |
764 if (exists(filepath)) { | |
765 strcpy(rpath, filepath); | |
766 return true; | |
767 } | |
768 | |
769 // then try /jre/lib/ and /jre/lib/server | |
770 filepath[filepath_base_size] = '\0'; | |
771 strcat(filepath, "/jre/lib"); | |
772 strcat(filepath, filename); | |
773 if (exists(filepath)) { | |
774 strcpy(rpath, filepath); | |
775 return true; | |
776 } | |
777 pos = strstr(filepath, filename); | |
778 *pos = '\0'; | |
779 strcat(filepath, "/server"); | |
780 strcat(filepath, filename); | |
781 if (exists(filepath)) { | |
782 strcpy(rpath, filepath); | |
783 return true; | |
784 } | |
785 | |
786 return false; | |
787 } | |
788 | |
789 static bool read_shared_lib_info(struct ps_prochandle* ph) { | |
790 static int pagesize = 0; | |
791 int fd = ph->core->core_fd; | |
792 int i = 0, j; | |
793 uint32_t v; | |
794 mach_header_64 header; // used to check if a file header in segment | |
795 load_command lcmd; | |
796 dylib_command dylibcmd; | |
797 | |
798 char name[BUF_SIZE]; // use to store name | |
799 | |
800 if (pagesize == 0) { | |
801 pagesize = getpagesize(); | |
802 print_debug("page size is %d\n", pagesize); | |
803 } | |
804 for (j = 0; j < ph->core->num_maps; j++) { | |
805 map_info *iter = ph->core->map_array[j]; // head | |
806 off_t fpos = iter->offset; | |
807 if (iter->fd != fd) { | |
808 // only search core file! | |
809 continue; | |
810 } | |
811 print_debug("map_info %d: vmaddr = 0x%016" PRIx64 " fileoff = %" PRIu64 " vmsize = %" PRIu64 "\n", | |
812 j, iter->vaddr, iter->offset, iter->memsz); | |
813 lseek(fd, fpos, SEEK_SET); | |
814 // we assume .dylib loaded at segment address --- which is true for JVM libraries | |
815 // multiple files may be loaded in one segment. | |
816 // if first word is not a magic word, means this segment does not contain lib file. | |
817 if (read(fd, (void *)&v, sizeof(uint32_t)) == sizeof(uint32_t)) { | |
818 if (v != MH_MAGIC_64) { | |
819 continue; | |
820 } | |
821 } else { | |
822 // may be encountered last map, which is not readable | |
823 continue; | |
824 } | |
825 while (ltell(fd) - iter->offset < iter->memsz) { | |
826 lseek(fd, fpos, SEEK_SET); | |
827 if (read(fd, (void *)&v, sizeof(uint32_t)) != sizeof(uint32_t)) { | |
828 break; | |
829 } | |
830 if (v != MH_MAGIC_64) { | |
831 fpos = (ltell(fd) + pagesize -1)/pagesize * pagesize; | |
832 continue; | |
833 } | |
834 lseek(fd, -sizeof(uint32_t), SEEK_CUR); | |
835 // this is the file begining to core file. | |
836 if (read(fd, (void *)&header, sizeof(mach_header_64)) != sizeof(mach_header_64)) { | |
837 goto err; | |
838 } | |
839 fpos = ltell(fd); | |
840 | |
841 // found a mach-o file in this segment | |
842 for (i = 0; i < header.ncmds; i++) { | |
843 // read commands in this "file" | |
844 // LC_ID_DYLIB is the file itself for a .dylib | |
845 lseek(fd, fpos, SEEK_SET); | |
846 if (read(fd, (void *)&lcmd, sizeof(load_command)) != sizeof(load_command)) { | |
847 return false; // error | |
848 } | |
849 fpos += lcmd.cmdsize; // next command position | |
850 // make sure still within seg size. | |
851 if (fpos - lcmd.cmdsize - iter->offset > iter->memsz) { | |
852 print_debug("Warning: out of segement limit: %ld \n", fpos - lcmd.cmdsize - iter->offset); | |
853 break; // no need to iterate all commands | |
854 } | |
855 if (lcmd.cmd == LC_ID_DYLIB) { | |
856 lseek(fd, -sizeof(load_command), SEEK_CUR); | |
857 if (read(fd, (void *)&dylibcmd, sizeof(dylib_command)) != sizeof(dylib_command)) { | |
858 return false; | |
859 } | |
860 /**** name stored at dylib_command.dylib.name.offset, is a C string */ | |
861 lseek(fd, dylibcmd.dylib.name.offset - sizeof(dylib_command), SEEK_CUR); | |
862 int j = 0; | |
863 while (j < BUF_SIZE) { | |
864 read(fd, (void *)(name + j), sizeof(char)); | |
865 if (name[j] == '\0') break; | |
866 j++; | |
867 } | |
868 print_debug("%s\n", name); | |
869 // changed name from @rpath/xxxx.dylib to real path | |
870 if (strrchr(name, '@')) { | |
871 get_real_path(ph, name); | |
872 print_debug("get_real_path returned: %s\n", name); | |
873 } | |
874 add_lib_info(ph, name, iter->vaddr); | |
875 break; | |
876 } | |
877 } | |
878 // done with the file, advanced to next page to search more files | |
879 fpos = (ltell(fd) + pagesize - 1) / pagesize * pagesize; | |
880 } | |
881 } | |
882 return true; | |
883 err: | |
884 return false; | |
885 } | |
886 | |
887 bool read_macho64_header(int fd, mach_header_64* core_header) { | |
888 bool is_macho = false; | |
889 if (fd < 0) return false; | |
890 off_t pos = ltell(fd); | |
891 lseek(fd, 0, SEEK_SET); | |
892 if (read(fd, (void *)core_header, sizeof(mach_header_64)) != sizeof(mach_header_64)) { | |
893 is_macho = false; | |
894 } else { | |
895 is_macho = (core_header->magic == MH_MAGIC_64 || core_header->magic == MH_CIGAM_64); | |
896 } | |
897 lseek(fd, pos, SEEK_SET); | |
898 return is_macho; | |
899 } | |
900 | |
901 // the one and only one exposed stuff from this file | |
902 struct ps_prochandle* Pgrab_core(const char* exec_file, const char* core_file) { | |
903 mach_header_64 core_header; | |
904 mach_header_64 exec_header; | |
905 | |
906 struct ps_prochandle* ph = (struct ps_prochandle*) calloc(1, sizeof(struct ps_prochandle)); | |
907 if (ph == NULL) { | |
908 print_debug("cant allocate ps_prochandle\n"); | |
909 return NULL; | |
910 } | |
911 | |
912 if ((ph->core = (struct core_data*) calloc(1, sizeof(struct core_data))) == NULL) { | |
913 free(ph); | |
914 print_debug("can't allocate ps_prochandle\n"); | |
915 return NULL; | |
916 } | |
917 | |
918 // initialize ph | |
919 ph->ops = &core_ops; | |
920 ph->core->core_fd = -1; | |
921 ph->core->exec_fd = -1; | |
922 ph->core->interp_fd = -1; | |
923 | |
924 print_debug("exec: %s core: %s", exec_file, core_file); | |
925 | |
926 strncpy(ph->core->exec_path, exec_file, sizeof(ph->core->exec_path)); | |
927 | |
928 // open the core file | |
929 if ((ph->core->core_fd = open(core_file, O_RDONLY)) < 0) { | |
930 print_error("can't open core file\n"); | |
931 goto err; | |
932 } | |
933 | |
934 // read core file header | |
935 if (read_macho64_header(ph->core->core_fd, &core_header) != true || core_header.filetype != MH_CORE) { | |
936 print_debug("core file is not a valid Mach-O file\n"); | |
937 goto err; | |
938 } | |
939 | |
940 if ((ph->core->exec_fd = open(exec_file, O_RDONLY)) < 0) { | |
941 print_error("can't open executable file\n"); | |
942 goto err; | |
943 } | |
944 | |
945 if (read_macho64_header(ph->core->exec_fd, &exec_header) != true || | |
946 exec_header.filetype != MH_EXECUTE) { | |
947 print_error("executable file is not a valid Mach-O file\n"); | |
948 goto err; | |
949 } | |
950 | |
951 // process core file segments | |
952 if (read_core_segments(ph) != true) { | |
953 print_error("failed to read core segments\n"); | |
954 goto err; | |
955 } | |
956 | |
957 // allocate and sort maps into map_array, we need to do this | |
958 // here because read_shared_lib_info needs to read from debuggee | |
959 // address space | |
960 if (sort_map_array(ph) != true) { | |
961 print_error("failed to sort segment map array\n"); | |
962 goto err; | |
963 } | |
964 | |
965 if (read_shared_lib_info(ph) != true) { | |
966 print_error("failed to read libraries\n"); | |
967 goto err; | |
968 } | |
969 | |
970 // sort again because we have added more mappings from shared objects | |
971 if (sort_map_array(ph) != true) { | |
972 print_error("failed to sort segment map array\n"); | |
973 goto err; | |
974 } | |
975 | |
976 if (init_classsharing_workaround(ph) != true) { | |
977 print_error("failed to workaround classshareing\n"); | |
978 goto err; | |
979 } | |
980 | |
981 print_debug("Leave Pgrab_core\n"); | |
982 return ph; | |
983 | |
984 err: | |
985 Prelease(ph); | |
986 return NULL; | |
987 } | |
988 | |
989 #else // __APPLE__ (none macosx) | |
990 | |
991 // read regs and create thread from core file | |
3960 | 992 static bool core_handle_prstatus(struct ps_prochandle* ph, const char* buf, size_t nbytes) { |
993 // we have to read prstatus_t from buf | |
994 // assert(nbytes == sizeof(prstaus_t), "size mismatch on prstatus_t"); | |
995 prstatus_t* prstat = (prstatus_t*) buf; | |
8750 | 996 sa_thread_info* newthr; |
3960 | 997 print_debug("got integer regset for lwp %d\n", prstat->pr_pid); |
998 // we set pthread_t to -1 for core dump | |
999 if((newthr = add_thread_info(ph, (pthread_t) -1, prstat->pr_pid)) == NULL) | |
1000 return false; | |
1001 | |
1002 // copy regs | |
1003 memcpy(&newthr->regs, &prstat->pr_reg, sizeof(struct reg)); | |
1004 | |
1005 if (is_debug()) { | |
1006 print_debug("integer regset\n"); | |
1007 #ifdef i386 | |
1008 // print the regset | |
1009 print_debug("\teax = 0x%x\n", newthr->regs.r_eax); | |
1010 print_debug("\tebx = 0x%x\n", newthr->regs.r_ebx); | |
1011 print_debug("\tecx = 0x%x\n", newthr->regs.r_ecx); | |
1012 print_debug("\tedx = 0x%x\n", newthr->regs.r_edx); | |
1013 print_debug("\tesp = 0x%x\n", newthr->regs.r_esp); | |
1014 print_debug("\tebp = 0x%x\n", newthr->regs.r_ebp); | |
1015 print_debug("\tesi = 0x%x\n", newthr->regs.r_esi); | |
1016 print_debug("\tedi = 0x%x\n", newthr->regs.r_edi); | |
1017 print_debug("\teip = 0x%x\n", newthr->regs.r_eip); | |
1018 #endif | |
1019 | |
1020 #if defined(amd64) || defined(x86_64) | |
1021 // print the regset | |
1022 print_debug("\tr15 = 0x%lx\n", newthr->regs.r_r15); | |
1023 print_debug("\tr14 = 0x%lx\n", newthr->regs.r_r14); | |
1024 print_debug("\tr13 = 0x%lx\n", newthr->regs.r_r13); | |
1025 print_debug("\tr12 = 0x%lx\n", newthr->regs.r_r12); | |
1026 print_debug("\trbp = 0x%lx\n", newthr->regs.r_rbp); | |
1027 print_debug("\trbx = 0x%lx\n", newthr->regs.r_rbx); | |
1028 print_debug("\tr11 = 0x%lx\n", newthr->regs.r_r11); | |
1029 print_debug("\tr10 = 0x%lx\n", newthr->regs.r_r10); | |
1030 print_debug("\tr9 = 0x%lx\n", newthr->regs.r_r9); | |
1031 print_debug("\tr8 = 0x%lx\n", newthr->regs.r_r8); | |
1032 print_debug("\trax = 0x%lx\n", newthr->regs.r_rax); | |
1033 print_debug("\trcx = 0x%lx\n", newthr->regs.r_rcx); | |
1034 print_debug("\trdx = 0x%lx\n", newthr->regs.r_rdx); | |
1035 print_debug("\trsi = 0x%lx\n", newthr->regs.r_rsi); | |
1036 print_debug("\trdi = 0x%lx\n", newthr->regs.r_rdi); | |
1037 //print_debug("\torig_rax = 0x%lx\n", newthr->regs.orig_rax); | |
1038 print_debug("\trip = 0x%lx\n", newthr->regs.r_rip); | |
1039 print_debug("\tcs = 0x%lx\n", newthr->regs.r_cs); | |
1040 //print_debug("\teflags = 0x%lx\n", newthr->regs.eflags); | |
1041 print_debug("\trsp = 0x%lx\n", newthr->regs.r_rsp); | |
1042 print_debug("\tss = 0x%lx\n", newthr->regs.r_ss); | |
1043 //print_debug("\tfs_base = 0x%lx\n", newthr->regs.fs_base); | |
1044 //print_debug("\tgs_base = 0x%lx\n", newthr->regs.gs_base); | |
1045 //print_debug("\tds = 0x%lx\n", newthr->regs.ds); | |
1046 //print_debug("\tes = 0x%lx\n", newthr->regs.es); | |
1047 //print_debug("\tfs = 0x%lx\n", newthr->regs.fs); | |
1048 //print_debug("\tgs = 0x%lx\n", newthr->regs.gs); | |
1049 #endif | |
1050 } | |
1051 | |
1052 return true; | |
1053 } | |
1054 | |
1055 #define ROUNDUP(x, y) ((((x)+((y)-1))/(y))*(y)) | |
1056 | |
1057 // read NT_PRSTATUS entries from core NOTE segment | |
1058 static bool core_handle_note(struct ps_prochandle* ph, ELF_PHDR* note_phdr) { | |
1059 char* buf = NULL; | |
1060 char* p = NULL; | |
1061 size_t size = note_phdr->p_filesz; | |
1062 | |
1063 // we are interested in just prstatus entries. we will ignore the rest. | |
1064 // Advance the seek pointer to the start of the PT_NOTE data | |
1065 if (lseek(ph->core->core_fd, note_phdr->p_offset, SEEK_SET) == (off_t)-1) { | |
1066 print_debug("failed to lseek to PT_NOTE data\n"); | |
1067 return false; | |
1068 } | |
1069 | |
1070 // Now process the PT_NOTE structures. Each one is preceded by | |
1071 // an Elf{32/64}_Nhdr structure describing its type and size. | |
1072 if ( (buf = (char*) malloc(size)) == NULL) { | |
1073 print_debug("can't allocate memory for reading core notes\n"); | |
1074 goto err; | |
1075 } | |
1076 | |
1077 // read notes into buffer | |
1078 if (read(ph->core->core_fd, buf, size) != size) { | |
1079 print_debug("failed to read notes, core file must have been truncated\n"); | |
1080 goto err; | |
1081 } | |
1082 | |
1083 p = buf; | |
1084 while (p < buf + size) { | |
1085 ELF_NHDR* notep = (ELF_NHDR*) p; | |
1086 char* descdata = p + sizeof(ELF_NHDR) + ROUNDUP(notep->n_namesz, 4); | |
1087 print_debug("Note header with n_type = %d and n_descsz = %u\n", | |
1088 notep->n_type, notep->n_descsz); | |
1089 | |
1090 if (notep->n_type == NT_PRSTATUS) { | |
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1091 if (core_handle_prstatus(ph, descdata, notep->n_descsz) != true) { |
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1092 return false; |
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1093 } |
3960 | 1094 } |
1095 p = descdata + ROUNDUP(notep->n_descsz, 4); | |
1096 } | |
1097 | |
1098 free(buf); | |
1099 return true; | |
1100 | |
1101 err: | |
1102 if (buf) free(buf); | |
1103 return false; | |
1104 } | |
1105 | |
1106 // read all segments from core file | |
1107 static bool read_core_segments(struct ps_prochandle* ph, ELF_EHDR* core_ehdr) { | |
1108 int i = 0; | |
1109 ELF_PHDR* phbuf = NULL; | |
1110 ELF_PHDR* core_php = NULL; | |
1111 | |
1112 if ((phbuf = read_program_header_table(ph->core->core_fd, core_ehdr)) == NULL) | |
1113 return false; | |
1114 | |
1115 /* | |
1116 * Now iterate through the program headers in the core file. | |
1117 * We're interested in two types of Phdrs: PT_NOTE (which | |
1118 * contains a set of saved /proc structures), and PT_LOAD (which | |
1119 * represents a memory mapping from the process's address space). | |
1120 * | |
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1121 * Difference b/w Solaris PT_NOTE and Linux/BSD PT_NOTE: |
3960 | 1122 * |
1123 * In Solaris there are two PT_NOTE segments the first PT_NOTE (if present) | |
1124 * contains /proc structs in the pre-2.6 unstructured /proc format. the last | |
1125 * PT_NOTE has data in new /proc format. | |
1126 * | |
1127 * In Solaris, there is only one pstatus (process status). pstatus contains | |
1128 * integer register set among other stuff. For each LWP, we have one lwpstatus | |
1129 * entry that has integer regset for that LWP. | |
1130 * | |
1131 * Linux threads are actually 'clone'd processes. To support core analysis | |
1132 * of "multithreaded" process, Linux creates more than one pstatus (called | |
1133 * "prstatus") entry in PT_NOTE. Each prstatus entry has integer regset for one | |
1134 * "thread". Please refer to Linux kernel src file 'fs/binfmt_elf.c', in particular | |
1135 * function "elf_core_dump". | |
1136 */ | |
1137 | |
1138 for (core_php = phbuf, i = 0; i < core_ehdr->e_phnum; i++) { | |
1139 switch (core_php->p_type) { | |
1140 case PT_NOTE: | |
8750 | 1141 if (core_handle_note(ph, core_php) != true) { |
1142 goto err; | |
1143 } | |
3960 | 1144 break; |
1145 | |
1146 case PT_LOAD: { | |
1147 if (core_php->p_filesz != 0) { | |
1148 if (add_map_info(ph, ph->core->core_fd, core_php->p_offset, | |
1149 core_php->p_vaddr, core_php->p_filesz) == NULL) goto err; | |
1150 } | |
1151 break; | |
1152 } | |
1153 } | |
1154 | |
1155 core_php++; | |
1156 } | |
1157 | |
1158 free(phbuf); | |
1159 return true; | |
1160 err: | |
1161 free(phbuf); | |
1162 return false; | |
1163 } | |
1164 | |
1165 // read segments of a shared object | |
1166 static bool read_lib_segments(struct ps_prochandle* ph, int lib_fd, ELF_EHDR* lib_ehdr, uintptr_t lib_base) { | |
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1167 int i = 0; |
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1168 ELF_PHDR* phbuf; |
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1169 ELF_PHDR* lib_php = NULL; |
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1170 |
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1171 int page_size=sysconf(_SC_PAGE_SIZE); |
3960 | 1172 |
12807
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1173 if ((phbuf = read_program_header_table(lib_fd, lib_ehdr)) == NULL) { |
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1174 return false; |
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1175 } |
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1176 |
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1177 // we want to process only PT_LOAD segments that are not writable. |
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1178 // i.e., text segments. The read/write/exec (data) segments would |
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1179 // have been already added from core file segments. |
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1180 for (lib_php = phbuf, i = 0; i < lib_ehdr->e_phnum; i++) { |
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1181 if ((lib_php->p_type == PT_LOAD) && !(lib_php->p_flags & PF_W) && (lib_php->p_filesz != 0)) { |
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1182 |
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1183 uintptr_t target_vaddr = lib_php->p_vaddr + lib_base; |
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1184 map_info *existing_map = core_lookup(ph, target_vaddr); |
3960 | 1185 |
12807
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1186 if (existing_map == NULL){ |
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1187 if (add_map_info(ph, lib_fd, lib_php->p_offset, |
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1188 target_vaddr, lib_php->p_filesz) == NULL) { |
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1189 goto err; |
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1190 } |
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1191 } else { |
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1192 if ((existing_map->memsz != page_size) && |
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1193 (existing_map->fd != lib_fd) && |
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1194 (existing_map->memsz != lib_php->p_filesz)){ |
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1195 |
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1196 print_debug("address conflict @ 0x%lx (size = %ld, flags = %d\n)", |
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1197 target_vaddr, lib_php->p_filesz, lib_php->p_flags); |
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1198 goto err; |
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|
1199 } |
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1200 |
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1201 /* replace PT_LOAD segment with library segment */ |
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1202 print_debug("overwrote with new address mapping (memsz %ld -> %ld)\n", |
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1203 existing_map->memsz, lib_php->p_filesz); |
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1204 |
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1205 existing_map->fd = lib_fd; |
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1206 existing_map->offset = lib_php->p_offset; |
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1207 existing_map->memsz = lib_php->p_filesz; |
3960 | 1208 } |
12807
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1209 } |
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1210 |
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1211 lib_php++; |
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1212 } |
3960 | 1213 |
12807
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1214 free(phbuf); |
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1215 return true; |
3960 | 1216 err: |
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1217 free(phbuf); |
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1218 return false; |
3960 | 1219 } |
1220 | |
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1221 // process segments from interpreter (ld.so or ld-linux.so or ld-elf.so) |
3960 | 1222 static bool read_interp_segments(struct ps_prochandle* ph) { |
1223 ELF_EHDR interp_ehdr; | |
1224 | |
1225 if (read_elf_header(ph->core->interp_fd, &interp_ehdr) != true) { | |
1226 print_debug("interpreter is not a valid ELF file\n"); | |
1227 return false; | |
1228 } | |
1229 | |
1230 if (read_lib_segments(ph, ph->core->interp_fd, &interp_ehdr, ph->core->ld_base_addr) != true) { | |
1231 print_debug("can't read segments of interpreter\n"); | |
1232 return false; | |
1233 } | |
1234 | |
1235 return true; | |
1236 } | |
1237 | |
1238 // process segments of a a.out | |
1239 static bool read_exec_segments(struct ps_prochandle* ph, ELF_EHDR* exec_ehdr) { | |
1240 int i = 0; | |
1241 ELF_PHDR* phbuf = NULL; | |
1242 ELF_PHDR* exec_php = NULL; | |
1243 | |
1244 if ((phbuf = read_program_header_table(ph->core->exec_fd, exec_ehdr)) == NULL) | |
1245 return false; | |
1246 | |
1247 for (exec_php = phbuf, i = 0; i < exec_ehdr->e_phnum; i++) { | |
1248 switch (exec_php->p_type) { | |
1249 | |
1250 // add mappings for PT_LOAD segments | |
1251 case PT_LOAD: { | |
1252 // add only non-writable segments of non-zero filesz | |
1253 if (!(exec_php->p_flags & PF_W) && exec_php->p_filesz != 0) { | |
1254 if (add_map_info(ph, ph->core->exec_fd, exec_php->p_offset, exec_php->p_vaddr, exec_php->p_filesz) == NULL) goto err; | |
1255 } | |
1256 break; | |
1257 } | |
1258 | |
1259 // read the interpreter and it's segments | |
1260 case PT_INTERP: { | |
1261 char interp_name[BUF_SIZE]; | |
1262 | |
1263 pread(ph->core->exec_fd, interp_name, MIN(exec_php->p_filesz, BUF_SIZE), exec_php->p_offset); | |
1264 print_debug("ELF interpreter %s\n", interp_name); | |
1265 // read interpreter segments as well | |
1266 if ((ph->core->interp_fd = pathmap_open(interp_name)) < 0) { | |
1267 print_debug("can't open runtime loader\n"); | |
1268 goto err; | |
1269 } | |
1270 break; | |
1271 } | |
1272 | |
1273 // from PT_DYNAMIC we want to read address of first link_map addr | |
1274 case PT_DYNAMIC: { | |
1275 ph->core->dynamic_addr = exec_php->p_vaddr; | |
1276 print_debug("address of _DYNAMIC is 0x%lx\n", ph->core->dynamic_addr); | |
1277 break; | |
1278 } | |
1279 | |
1280 } // switch | |
1281 exec_php++; | |
1282 } // for | |
1283 | |
1284 free(phbuf); | |
1285 return true; | |
1286 err: | |
1287 free(phbuf); | |
1288 return false; | |
1289 } | |
1290 | |
1291 #define FIRST_LINK_MAP_OFFSET offsetof(struct r_debug, r_map) | |
1292 #define LD_BASE_OFFSET offsetof(struct r_debug, r_ldbase) | |
1293 #define LINK_MAP_ADDR_OFFSET offsetof(struct link_map, l_addr) | |
1294 #define LINK_MAP_NAME_OFFSET offsetof(struct link_map, l_name) | |
1295 #define LINK_MAP_NEXT_OFFSET offsetof(struct link_map, l_next) | |
1296 | |
1297 // read shared library info from runtime linker's data structures. | |
1298 // This work is done by librtlb_db in Solaris | |
1299 static bool read_shared_lib_info(struct ps_prochandle* ph) { | |
8750 | 1300 uintptr_t addr = ph->core->dynamic_addr; |
1301 uintptr_t debug_base; | |
1302 uintptr_t first_link_map_addr; | |
1303 uintptr_t ld_base_addr; | |
1304 uintptr_t link_map_addr; | |
1305 uintptr_t lib_base_diff; | |
1306 uintptr_t lib_base; | |
1307 uintptr_t lib_name_addr; | |
1308 char lib_name[BUF_SIZE]; | |
1309 ELF_DYN dyn; | |
1310 ELF_EHDR elf_ehdr; | |
1311 int lib_fd; | |
3960 | 1312 |
8750 | 1313 // _DYNAMIC has information of the form |
1314 // [tag] [data] [tag] [data] ..... | |
1315 // Both tag and data are pointer sized. | |
1316 // We look for dynamic info with DT_DEBUG. This has shared object info. | |
1317 // refer to struct r_debug in link.h | |
3960 | 1318 |
8750 | 1319 dyn.d_tag = DT_NULL; |
1320 while (dyn.d_tag != DT_DEBUG) { | |
1321 if (ps_pread(ph, (psaddr_t) addr, &dyn, sizeof(ELF_DYN)) != PS_OK) { | |
1322 print_debug("can't read debug info from _DYNAMIC\n"); | |
1323 return false; | |
1324 } | |
1325 addr += sizeof(ELF_DYN); | |
1326 } | |
3960 | 1327 |
8750 | 1328 // we have got Dyn entry with DT_DEBUG |
1329 debug_base = dyn.d_un.d_ptr; | |
1330 // at debug_base we have struct r_debug. This has first link map in r_map field | |
1331 if (ps_pread(ph, (psaddr_t) debug_base + FIRST_LINK_MAP_OFFSET, | |
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1332 &first_link_map_addr, sizeof(uintptr_t)) != PS_OK) { |
8750 | 1333 print_debug("can't read first link map address\n"); |
1334 return false; | |
1335 } | |
3960 | 1336 |
8750 | 1337 // read ld_base address from struct r_debug |
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1338 #if 0 // There is no r_ldbase member on BSD |
8750 | 1339 if (ps_pread(ph, (psaddr_t) debug_base + LD_BASE_OFFSET, &ld_base_addr, |
1340 sizeof(uintptr_t)) != PS_OK) { | |
1341 print_debug("can't read ld base address\n"); | |
1342 return false; | |
1343 } | |
1344 ph->core->ld_base_addr = ld_base_addr; | |
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1345 #else |
8750 | 1346 ph->core->ld_base_addr = 0; |
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1347 #endif |
3960 | 1348 |
8750 | 1349 print_debug("interpreter base address is 0x%lx\n", ld_base_addr); |
3960 | 1350 |
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1351 // now read segments from interp (i.e ld.so or ld-linux.so or ld-elf.so) |
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1352 if (read_interp_segments(ph) != true) { |
8750 | 1353 return false; |
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1354 } |
3960 | 1355 |
8750 | 1356 // after adding interpreter (ld.so) mappings sort again |
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1357 if (sort_map_array(ph) != true) { |
8750 | 1358 return false; |
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1359 } |
3960 | 1360 |
8750 | 1361 print_debug("first link map is at 0x%lx\n", first_link_map_addr); |
3960 | 1362 |
8750 | 1363 link_map_addr = first_link_map_addr; |
1364 while (link_map_addr != 0) { | |
1365 // read library base address of the .so. Note that even though <sys/link.h> calls | |
1366 // link_map->l_addr as "base address", this is * not * really base virtual | |
1367 // address of the shared object. This is actually the difference b/w the virtual | |
1368 // address mentioned in shared object and the actual virtual base where runtime | |
1369 // linker loaded it. We use "base diff" in read_lib_segments call below. | |
3960 | 1370 |
8750 | 1371 if (ps_pread(ph, (psaddr_t) link_map_addr + LINK_MAP_ADDR_OFFSET, |
1372 &lib_base_diff, sizeof(uintptr_t)) != PS_OK) { | |
1373 print_debug("can't read shared object base address diff\n"); | |
1374 return false; | |
1375 } | |
3960 | 1376 |
8750 | 1377 // read address of the name |
1378 if (ps_pread(ph, (psaddr_t) link_map_addr + LINK_MAP_NAME_OFFSET, | |
1379 &lib_name_addr, sizeof(uintptr_t)) != PS_OK) { | |
1380 print_debug("can't read address of shared object name\n"); | |
1381 return false; | |
1382 } | |
3960 | 1383 |
8750 | 1384 // read name of the shared object |
1385 if (read_string(ph, (uintptr_t) lib_name_addr, lib_name, sizeof(lib_name)) != true) { | |
1386 print_debug("can't read shared object name\n"); | |
1387 return false; | |
1388 } | |
3960 | 1389 |
8750 | 1390 if (lib_name[0] != '\0') { |
1391 // ignore empty lib names | |
1392 lib_fd = pathmap_open(lib_name); | |
3960 | 1393 |
8750 | 1394 if (lib_fd < 0) { |
1395 print_debug("can't open shared object %s\n", lib_name); | |
1396 // continue with other libraries... | |
1397 } else { | |
1398 if (read_elf_header(lib_fd, &elf_ehdr)) { | |
1399 lib_base = lib_base_diff + find_base_address(lib_fd, &elf_ehdr); | |
1400 print_debug("reading library %s @ 0x%lx [ 0x%lx ]\n", | |
1401 lib_name, lib_base, lib_base_diff); | |
1402 // while adding library mappings we need to use "base difference". | |
1403 if (! read_lib_segments(ph, lib_fd, &elf_ehdr, lib_base_diff)) { | |
1404 print_debug("can't read shared object's segments\n"); | |
1405 close(lib_fd); | |
1406 return false; | |
1407 } | |
1408 add_lib_info_fd(ph, lib_name, lib_fd, lib_base); | |
1409 // Map info is added for the library (lib_name) so | |
1410 // we need to re-sort it before calling the p_pdread. | |
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1411 if (sort_map_array(ph) != true) { |
8750 | 1412 return false; |
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1413 } |
8750 | 1414 } else { |
1415 print_debug("can't read ELF header for shared object %s\n", lib_name); | |
1416 close(lib_fd); | |
1417 // continue with other libraries... | |
1418 } | |
3960 | 1419 } |
8750 | 1420 } |
3960 | 1421 |
8750 | 1422 // read next link_map address |
1423 if (ps_pread(ph, (psaddr_t) link_map_addr + LINK_MAP_NEXT_OFFSET, | |
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1424 &link_map_addr, sizeof(uintptr_t)) != PS_OK) { |
8750 | 1425 print_debug("can't read next link in link_map\n"); |
1426 return false; | |
1427 } | |
1428 } | |
3960 | 1429 |
8750 | 1430 return true; |
3960 | 1431 } |
1432 | |
1433 // the one and only one exposed stuff from this file | |
1434 struct ps_prochandle* Pgrab_core(const char* exec_file, const char* core_file) { | |
8750 | 1435 ELF_EHDR core_ehdr; |
1436 ELF_EHDR exec_ehdr; | |
3960 | 1437 |
8750 | 1438 struct ps_prochandle* ph = (struct ps_prochandle*) calloc(1, sizeof(struct ps_prochandle)); |
1439 if (ph == NULL) { | |
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1440 print_debug("can't allocate ps_prochandle\n"); |
8750 | 1441 return NULL; |
1442 } | |
3960 | 1443 |
8750 | 1444 if ((ph->core = (struct core_data*) calloc(1, sizeof(struct core_data))) == NULL) { |
1445 free(ph); | |
1446 print_debug("can't allocate ps_prochandle\n"); | |
1447 return NULL; | |
1448 } | |
3960 | 1449 |
8750 | 1450 // initialize ph |
1451 ph->ops = &core_ops; | |
1452 ph->core->core_fd = -1; | |
1453 ph->core->exec_fd = -1; | |
1454 ph->core->interp_fd = -1; | |
1455 | |
1456 print_debug("exec: %s core: %s", exec_file, core_file); | |
3960 | 1457 |
8750 | 1458 // open the core file |
1459 if ((ph->core->core_fd = open(core_file, O_RDONLY)) < 0) { | |
1460 print_debug("can't open core file\n"); | |
1461 goto err; | |
1462 } | |
3960 | 1463 |
8750 | 1464 // read core file ELF header |
1465 if (read_elf_header(ph->core->core_fd, &core_ehdr) != true || core_ehdr.e_type != ET_CORE) { | |
1466 print_debug("core file is not a valid ELF ET_CORE file\n"); | |
1467 goto err; | |
1468 } | |
3960 | 1469 |
8750 | 1470 if ((ph->core->exec_fd = open(exec_file, O_RDONLY)) < 0) { |
1471 print_debug("can't open executable file\n"); | |
1472 goto err; | |
1473 } | |
3960 | 1474 |
8750 | 1475 if (read_elf_header(ph->core->exec_fd, &exec_ehdr) != true || exec_ehdr.e_type != ET_EXEC) { |
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1476 print_debug("executable file is not a valid ELF ET_EXEC file\n"); |
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1477 goto err; |
8750 | 1478 } |
3960 | 1479 |
8750 | 1480 // process core file segments |
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1481 if (read_core_segments(ph, &core_ehdr) != true) { |
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1482 goto err; |
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1483 } |
3960 | 1484 |
8750 | 1485 // process exec file segments |
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1486 if (read_exec_segments(ph, &exec_ehdr) != true) { |
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1487 goto err; |
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1488 } |
3960 | 1489 |
8750 | 1490 // exec file is also treated like a shared object for symbol search |
1491 if (add_lib_info_fd(ph, exec_file, ph->core->exec_fd, | |
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1492 (uintptr_t)0 + find_base_address(ph->core->exec_fd, &exec_ehdr)) == NULL) { |
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1493 goto err; |
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1494 } |
3960 | 1495 |
8750 | 1496 // allocate and sort maps into map_array, we need to do this |
1497 // here because read_shared_lib_info needs to read from debuggee | |
1498 // address space | |
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1499 if (sort_map_array(ph) != true) { |
8750 | 1500 goto err; |
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1501 } |
3960 | 1502 |
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1503 if (read_shared_lib_info(ph) != true) { |
8750 | 1504 goto err; |
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1505 } |
3960 | 1506 |
8750 | 1507 // sort again because we have added more mappings from shared objects |
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1508 if (sort_map_array(ph) != true) { |
8750 | 1509 goto err; |
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1510 } |
3960 | 1511 |
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1512 if (init_classsharing_workaround(ph) != true) { |
8750 | 1513 goto err; |
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1514 } |
3960 | 1515 |
8750 | 1516 print_debug("Leave Pgrab_core\n"); |
1517 return ph; | |
3960 | 1518 |
1519 err: | |
8750 | 1520 Prelease(ph); |
1521 return NULL; | |
3960 | 1522 } |
8750 | 1523 |
1524 #endif // __APPLE__ |