Mercurial > hg > truffle
annotate agent/src/os/linux/ps_core.c @ 6117:4434fdad6b37
Merge
author | dholmes |
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date | Sat, 02 Jun 2012 07:32:21 -0400 |
parents | 29ee40a082d3 |
children | da91efe96a93 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2003, 2010, 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++) { | |
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443 print_debug("base = 0x%lx\tsize = %zu\n", ph->core->map_array[j]->vaddr, |
0 | 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 = { | |
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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 } |