1
|
1 |
/*
|
|
2 |
* Copyright 2003-2007 Sun Microsystems, Inc. All Rights Reserved.
|
|
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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
|
|
20 |
* CA 95054 USA or visit www.sun.com if you need additional information or
|
|
21 |
* have any 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 <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 |
|
|
241 |
static bool read_int(struct ps_prochandle* ph, uintptr_t addr, int* pvalue) {
|
|
242 |
int i;
|
|
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;
|
|
298 |
int useSharedSpaces = 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 |
|
|
309 |
if (read_int(ph, useSharedSpacesAddr, &useSharedSpaces) != true) {
|
|
310 |
print_debug("can't read the value of 'UseSharedSpaces' flag\n");
|
|
311 |
return false;
|
|
312 |
}
|
|
313 |
|
|
314 |
if (useSharedSpaces == 0) {
|
|
315 |
print_debug("UseSharedSpaces is false, assuming -Xshare:off!\n");
|
|
316 |
return true;
|
|
317 |
}
|
|
318 |
|
|
319 |
sharedArchivePathAddrAddr = lookup_symbol(ph, jvm_name, SHARED_ARCHIVE_PATH_SYM);
|
|
320 |
if (sharedArchivePathAddrAddr == 0) {
|
|
321 |
print_debug("can't lookup shared archive path symbol\n");
|
|
322 |
return false;
|
|
323 |
}
|
|
324 |
|
|
325 |
if (read_pointer(ph, sharedArchivePathAddrAddr, &sharedArchivePathAddr) != true) {
|
|
326 |
print_debug("can't read shared archive path pointer\n");
|
|
327 |
return false;
|
|
328 |
}
|
|
329 |
|
|
330 |
if (read_string(ph, sharedArchivePathAddr, classes_jsa, sizeof(classes_jsa)) != true) {
|
|
331 |
print_debug("can't read shared archive path value\n");
|
|
332 |
return false;
|
|
333 |
}
|
|
334 |
|
|
335 |
print_debug("looking for %s\n", classes_jsa);
|
|
336 |
// open the class sharing archive file
|
|
337 |
fd = pathmap_open(classes_jsa);
|
|
338 |
if (fd < 0) {
|
|
339 |
print_debug("can't open %s!\n", classes_jsa);
|
|
340 |
ph->core->classes_jsa_fd = -1;
|
|
341 |
return false;
|
|
342 |
} else {
|
|
343 |
print_debug("opened %s\n", classes_jsa);
|
|
344 |
}
|
|
345 |
|
|
346 |
// read FileMapHeader from the file
|
|
347 |
memset(&header, 0, sizeof(struct FileMapHeader));
|
|
348 |
if ((n = read(fd, &header, sizeof(struct FileMapHeader)))
|
|
349 |
!= sizeof(struct FileMapHeader)) {
|
|
350 |
print_debug("can't read shared archive file map header from %s\n", classes_jsa);
|
|
351 |
close(fd);
|
|
352 |
return false;
|
|
353 |
}
|
|
354 |
|
|
355 |
// check file magic
|
|
356 |
if (header._magic != 0xf00baba2) {
|
|
357 |
print_debug("%s has bad shared archive file magic number 0x%x, expecing 0xf00baba2\n",
|
|
358 |
classes_jsa, header._magic);
|
|
359 |
close(fd);
|
|
360 |
return false;
|
|
361 |
}
|
|
362 |
|
|
363 |
// check version
|
|
364 |
if (header._version != CURRENT_ARCHIVE_VERSION) {
|
|
365 |
print_debug("%s has wrong shared archive file version %d, expecting %d\n",
|
|
366 |
classes_jsa, header._version, CURRENT_ARCHIVE_VERSION);
|
|
367 |
close(fd);
|
|
368 |
return false;
|
|
369 |
}
|
|
370 |
|
|
371 |
ph->core->classes_jsa_fd = fd;
|
|
372 |
// add read-only maps from classes[_g].jsa to the list of maps
|
|
373 |
for (m = 0; m < NUM_SHARED_MAPS; m++) {
|
|
374 |
if (header._space[m]._read_only) {
|
|
375 |
base = (uintptr_t) header._space[m]._base;
|
|
376 |
// no need to worry about the fractional pages at-the-end.
|
|
377 |
// possible fractional pages are handled by core_read_data.
|
|
378 |
add_class_share_map_info(ph, (off_t) header._space[m]._file_offset,
|
|
379 |
base, (size_t) header._space[m]._used);
|
|
380 |
print_debug("added a share archive map at 0x%lx\n", base);
|
|
381 |
}
|
|
382 |
}
|
|
383 |
return true;
|
|
384 |
}
|
|
385 |
lib = lib->next;
|
|
386 |
}
|
|
387 |
return true;
|
|
388 |
}
|
|
389 |
|
|
390 |
|
|
391 |
//---------------------------------------------------------------------------
|
|
392 |
// functions to handle map_info
|
|
393 |
|
|
394 |
// Order mappings based on virtual address. We use this function as the
|
|
395 |
// callback for sorting the array of map_info pointers.
|
|
396 |
static int core_cmp_mapping(const void *lhsp, const void *rhsp)
|
|
397 |
{
|
|
398 |
const map_info *lhs = *((const map_info **)lhsp);
|
|
399 |
const map_info *rhs = *((const map_info **)rhsp);
|
|
400 |
|
|
401 |
if (lhs->vaddr == rhs->vaddr)
|
|
402 |
return (0);
|
|
403 |
|
|
404 |
return (lhs->vaddr < rhs->vaddr ? -1 : 1);
|
|
405 |
}
|
|
406 |
|
|
407 |
// we sort map_info by starting virtual address so that we can do
|
|
408 |
// binary search to read from an address.
|
|
409 |
static bool sort_map_array(struct ps_prochandle* ph) {
|
|
410 |
size_t num_maps = ph->core->num_maps;
|
|
411 |
map_info* map = ph->core->maps;
|
|
412 |
int i = 0;
|
|
413 |
|
|
414 |
// allocate map_array
|
|
415 |
map_info** array;
|
|
416 |
if ( (array = (map_info**) malloc(sizeof(map_info*) * num_maps)) == NULL) {
|
|
417 |
print_debug("can't allocate memory for map array\n");
|
|
418 |
return false;
|
|
419 |
}
|
|
420 |
|
|
421 |
// add maps to array
|
|
422 |
while (map) {
|
|
423 |
array[i] = map;
|
|
424 |
i++;
|
|
425 |
map = map->next;
|
|
426 |
}
|
|
427 |
|
|
428 |
// sort is called twice. If this is second time, clear map array
|
|
429 |
if (ph->core->map_array) free(ph->core->map_array);
|
|
430 |
ph->core->map_array = array;
|
|
431 |
// sort the map_info array by base virtual address.
|
|
432 |
qsort(ph->core->map_array, ph->core->num_maps, sizeof (map_info*),
|
|
433 |
core_cmp_mapping);
|
|
434 |
|
|
435 |
// print map
|
|
436 |
if (is_debug()) {
|
|
437 |
int j = 0;
|
|
438 |
print_debug("---- sorted virtual address map ----\n");
|
|
439 |
for (j = 0; j < ph->core->num_maps; j++) {
|
|
440 |
print_debug("base = 0x%lx\tsize = %d\n", ph->core->map_array[j]->vaddr,
|
|
441 |
ph->core->map_array[j]->memsz);
|
|
442 |
}
|
|
443 |
}
|
|
444 |
|
|
445 |
return true;
|
|
446 |
}
|
|
447 |
|
|
448 |
#ifndef MIN
|
|
449 |
#define MIN(x, y) (((x) < (y))? (x): (y))
|
|
450 |
#endif
|
|
451 |
|
|
452 |
static bool core_read_data(struct ps_prochandle* ph, uintptr_t addr, char *buf, size_t size) {
|
|
453 |
ssize_t resid = size;
|
|
454 |
int page_size=sysconf(_SC_PAGE_SIZE);
|
|
455 |
while (resid != 0) {
|
|
456 |
map_info *mp = core_lookup(ph, addr);
|
|
457 |
uintptr_t mapoff;
|
|
458 |
ssize_t len, rem;
|
|
459 |
off_t off;
|
|
460 |
int fd;
|
|
461 |
|
|
462 |
if (mp == NULL)
|
|
463 |
break; /* No mapping for this address */
|
|
464 |
|
|
465 |
fd = mp->fd;
|
|
466 |
mapoff = addr - mp->vaddr;
|
|
467 |
len = MIN(resid, mp->memsz - mapoff);
|
|
468 |
off = mp->offset + mapoff;
|
|
469 |
|
|
470 |
if ((len = pread(fd, buf, len, off)) <= 0)
|
|
471 |
break;
|
|
472 |
|
|
473 |
resid -= len;
|
|
474 |
addr += len;
|
|
475 |
buf = (char *)buf + len;
|
|
476 |
|
|
477 |
// mappings always start at page boundary. But, may end in fractional
|
|
478 |
// page. fill zeros for possible fractional page at the end of a mapping.
|
|
479 |
rem = mp->memsz % page_size;
|
|
480 |
if (rem > 0) {
|
|
481 |
rem = page_size - rem;
|
|
482 |
len = MIN(resid, rem);
|
|
483 |
resid -= len;
|
|
484 |
addr += len;
|
|
485 |
// we are not assuming 'buf' to be zero initialized.
|
|
486 |
memset(buf, 0, len);
|
|
487 |
buf += len;
|
|
488 |
}
|
|
489 |
}
|
|
490 |
|
|
491 |
if (resid) {
|
|
492 |
print_debug("core read failed for %d byte(s) @ 0x%lx (%d more bytes)\n",
|
|
493 |
size, addr, resid);
|
|
494 |
return false;
|
|
495 |
} else {
|
|
496 |
return true;
|
|
497 |
}
|
|
498 |
}
|
|
499 |
|
|
500 |
// null implementation for write
|
|
501 |
static bool core_write_data(struct ps_prochandle* ph,
|
|
502 |
uintptr_t addr, const char *buf , size_t size) {
|
|
503 |
return false;
|
|
504 |
}
|
|
505 |
|
|
506 |
static bool core_get_lwp_regs(struct ps_prochandle* ph, lwpid_t lwp_id,
|
|
507 |
struct user_regs_struct* regs) {
|
|
508 |
// for core we have cached the lwp regs from NOTE section
|
|
509 |
thread_info* thr = ph->threads;
|
|
510 |
while (thr) {
|
|
511 |
if (thr->lwp_id == lwp_id) {
|
|
512 |
memcpy(regs, &thr->regs, sizeof(struct user_regs_struct));
|
|
513 |
return true;
|
|
514 |
}
|
|
515 |
thr = thr->next;
|
|
516 |
}
|
|
517 |
return false;
|
|
518 |
}
|
|
519 |
|
|
520 |
static ps_prochandle_ops core_ops = {
|
|
521 |
release: core_release,
|
|
522 |
p_pread: core_read_data,
|
|
523 |
p_pwrite: core_write_data,
|
|
524 |
get_lwp_regs: core_get_lwp_regs
|
|
525 |
};
|
|
526 |
|
|
527 |
// read regs and create thread from NT_PRSTATUS entries from core file
|
|
528 |
static bool core_handle_prstatus(struct ps_prochandle* ph, const char* buf, size_t nbytes) {
|
|
529 |
// we have to read prstatus_t from buf
|
|
530 |
// assert(nbytes == sizeof(prstaus_t), "size mismatch on prstatus_t");
|
|
531 |
prstatus_t* prstat = (prstatus_t*) buf;
|
|
532 |
thread_info* newthr;
|
|
533 |
print_debug("got integer regset for lwp %d\n", prstat->pr_pid);
|
|
534 |
// we set pthread_t to -1 for core dump
|
|
535 |
if((newthr = add_thread_info(ph, (pthread_t) -1, prstat->pr_pid)) == NULL)
|
|
536 |
return false;
|
|
537 |
|
|
538 |
// copy regs
|
|
539 |
memcpy(&newthr->regs, prstat->pr_reg, sizeof(struct user_regs_struct));
|
|
540 |
|
|
541 |
if (is_debug()) {
|
|
542 |
print_debug("integer regset\n");
|
|
543 |
#ifdef i386
|
|
544 |
// print the regset
|
|
545 |
print_debug("\teax = 0x%x\n", newthr->regs.eax);
|
|
546 |
print_debug("\tebx = 0x%x\n", newthr->regs.ebx);
|
|
547 |
print_debug("\tecx = 0x%x\n", newthr->regs.ecx);
|
|
548 |
print_debug("\tedx = 0x%x\n", newthr->regs.edx);
|
|
549 |
print_debug("\tesp = 0x%x\n", newthr->regs.esp);
|
|
550 |
print_debug("\tebp = 0x%x\n", newthr->regs.ebp);
|
|
551 |
print_debug("\tesi = 0x%x\n", newthr->regs.esi);
|
|
552 |
print_debug("\tedi = 0x%x\n", newthr->regs.edi);
|
|
553 |
print_debug("\teip = 0x%x\n", newthr->regs.eip);
|
|
554 |
#endif
|
|
555 |
|
|
556 |
#if defined(amd64) || defined(x86_64)
|
|
557 |
// print the regset
|
|
558 |
print_debug("\tr15 = 0x%lx\n", newthr->regs.r15);
|
|
559 |
print_debug("\tr14 = 0x%lx\n", newthr->regs.r14);
|
|
560 |
print_debug("\tr13 = 0x%lx\n", newthr->regs.r13);
|
|
561 |
print_debug("\tr12 = 0x%lx\n", newthr->regs.r12);
|
|
562 |
print_debug("\trbp = 0x%lx\n", newthr->regs.rbp);
|
|
563 |
print_debug("\trbx = 0x%lx\n", newthr->regs.rbx);
|
|
564 |
print_debug("\tr11 = 0x%lx\n", newthr->regs.r11);
|
|
565 |
print_debug("\tr10 = 0x%lx\n", newthr->regs.r10);
|
|
566 |
print_debug("\tr9 = 0x%lx\n", newthr->regs.r9);
|
|
567 |
print_debug("\tr8 = 0x%lx\n", newthr->regs.r8);
|
|
568 |
print_debug("\trax = 0x%lx\n", newthr->regs.rax);
|
|
569 |
print_debug("\trcx = 0x%lx\n", newthr->regs.rcx);
|
|
570 |
print_debug("\trdx = 0x%lx\n", newthr->regs.rdx);
|
|
571 |
print_debug("\trsi = 0x%lx\n", newthr->regs.rsi);
|
|
572 |
print_debug("\trdi = 0x%lx\n", newthr->regs.rdi);
|
|
573 |
print_debug("\torig_rax = 0x%lx\n", newthr->regs.orig_rax);
|
|
574 |
print_debug("\trip = 0x%lx\n", newthr->regs.rip);
|
|
575 |
print_debug("\tcs = 0x%lx\n", newthr->regs.cs);
|
|
576 |
print_debug("\teflags = 0x%lx\n", newthr->regs.eflags);
|
|
577 |
print_debug("\trsp = 0x%lx\n", newthr->regs.rsp);
|
|
578 |
print_debug("\tss = 0x%lx\n", newthr->regs.ss);
|
|
579 |
print_debug("\tfs_base = 0x%lx\n", newthr->regs.fs_base);
|
|
580 |
print_debug("\tgs_base = 0x%lx\n", newthr->regs.gs_base);
|
|
581 |
print_debug("\tds = 0x%lx\n", newthr->regs.ds);
|
|
582 |
print_debug("\tes = 0x%lx\n", newthr->regs.es);
|
|
583 |
print_debug("\tfs = 0x%lx\n", newthr->regs.fs);
|
|
584 |
print_debug("\tgs = 0x%lx\n", newthr->regs.gs);
|
|
585 |
#endif
|
|
586 |
}
|
|
587 |
|
|
588 |
return true;
|
|
589 |
}
|
|
590 |
|
|
591 |
#define ROUNDUP(x, y) ((((x)+((y)-1))/(y))*(y))
|
|
592 |
|
|
593 |
// read NT_PRSTATUS entries from core NOTE segment
|
|
594 |
static bool core_handle_note(struct ps_prochandle* ph, ELF_PHDR* note_phdr) {
|
|
595 |
char* buf = NULL;
|
|
596 |
char* p = NULL;
|
|
597 |
size_t size = note_phdr->p_filesz;
|
|
598 |
|
|
599 |
// we are interested in just prstatus entries. we will ignore the rest.
|
|
600 |
// Advance the seek pointer to the start of the PT_NOTE data
|
|
601 |
if (lseek(ph->core->core_fd, note_phdr->p_offset, SEEK_SET) == (off_t)-1) {
|
|
602 |
print_debug("failed to lseek to PT_NOTE data\n");
|
|
603 |
return false;
|
|
604 |
}
|
|
605 |
|
|
606 |
// Now process the PT_NOTE structures. Each one is preceded by
|
|
607 |
// an Elf{32/64}_Nhdr structure describing its type and size.
|
|
608 |
if ( (buf = (char*) malloc(size)) == NULL) {
|
|
609 |
print_debug("can't allocate memory for reading core notes\n");
|
|
610 |
goto err;
|
|
611 |
}
|
|
612 |
|
|
613 |
// read notes into buffer
|
|
614 |
if (read(ph->core->core_fd, buf, size) != size) {
|
|
615 |
print_debug("failed to read notes, core file must have been truncated\n");
|
|
616 |
goto err;
|
|
617 |
}
|
|
618 |
|
|
619 |
p = buf;
|
|
620 |
while (p < buf + size) {
|
|
621 |
ELF_NHDR* notep = (ELF_NHDR*) p;
|
|
622 |
char* descdata = p + sizeof(ELF_NHDR) + ROUNDUP(notep->n_namesz, 4);
|
|
623 |
print_debug("Note header with n_type = %d and n_descsz = %u\n",
|
|
624 |
notep->n_type, notep->n_descsz);
|
|
625 |
|
|
626 |
if (notep->n_type == NT_PRSTATUS) {
|
|
627 |
if (core_handle_prstatus(ph, descdata, notep->n_descsz) != true)
|
|
628 |
return false;
|
|
629 |
}
|
|
630 |
p = descdata + ROUNDUP(notep->n_descsz, 4);
|
|
631 |
}
|
|
632 |
|
|
633 |
free(buf);
|
|
634 |
return true;
|
|
635 |
|
|
636 |
err:
|
|
637 |
if (buf) free(buf);
|
|
638 |
return false;
|
|
639 |
}
|
|
640 |
|
|
641 |
// read all segments from core file
|
|
642 |
static bool read_core_segments(struct ps_prochandle* ph, ELF_EHDR* core_ehdr) {
|
|
643 |
int i = 0;
|
|
644 |
ELF_PHDR* phbuf = NULL;
|
|
645 |
ELF_PHDR* core_php = NULL;
|
|
646 |
|
|
647 |
if ((phbuf = read_program_header_table(ph->core->core_fd, core_ehdr)) == NULL)
|
|
648 |
return false;
|
|
649 |
|
|
650 |
/*
|
|
651 |
* Now iterate through the program headers in the core file.
|
|
652 |
* We're interested in two types of Phdrs: PT_NOTE (which
|
|
653 |
* contains a set of saved /proc structures), and PT_LOAD (which
|
|
654 |
* represents a memory mapping from the process's address space).
|
|
655 |
*
|
|
656 |
* Difference b/w Solaris PT_NOTE and Linux PT_NOTE:
|
|
657 |
*
|
|
658 |
* In Solaris there are two PT_NOTE segments the first PT_NOTE (if present)
|
|
659 |
* contains /proc structs in the pre-2.6 unstructured /proc format. the last
|
|
660 |
* PT_NOTE has data in new /proc format.
|
|
661 |
*
|
|
662 |
* In Solaris, there is only one pstatus (process status). pstatus contains
|
|
663 |
* integer register set among other stuff. For each LWP, we have one lwpstatus
|
|
664 |
* entry that has integer regset for that LWP.
|
|
665 |
*
|
|
666 |
* Linux threads are actually 'clone'd processes. To support core analysis
|
|
667 |
* of "multithreaded" process, Linux creates more than one pstatus (called
|
|
668 |
* "prstatus") entry in PT_NOTE. Each prstatus entry has integer regset for one
|
|
669 |
* "thread". Please refer to Linux kernel src file 'fs/binfmt_elf.c', in particular
|
|
670 |
* function "elf_core_dump".
|
|
671 |
*/
|
|
672 |
|
|
673 |
for (core_php = phbuf, i = 0; i < core_ehdr->e_phnum; i++) {
|
|
674 |
switch (core_php->p_type) {
|
|
675 |
case PT_NOTE:
|
|
676 |
if (core_handle_note(ph, core_php) != true) goto err;
|
|
677 |
break;
|
|
678 |
|
|
679 |
case PT_LOAD: {
|
|
680 |
if (core_php->p_filesz != 0) {
|
|
681 |
if (add_map_info(ph, ph->core->core_fd, core_php->p_offset,
|
|
682 |
core_php->p_vaddr, core_php->p_filesz) == NULL) goto err;
|
|
683 |
}
|
|
684 |
break;
|
|
685 |
}
|
|
686 |
}
|
|
687 |
|
|
688 |
core_php++;
|
|
689 |
}
|
|
690 |
|
|
691 |
free(phbuf);
|
|
692 |
return true;
|
|
693 |
err:
|
|
694 |
free(phbuf);
|
|
695 |
return false;
|
|
696 |
}
|
|
697 |
|
|
698 |
// read segments of a shared object
|
|
699 |
static bool read_lib_segments(struct ps_prochandle* ph, int lib_fd, ELF_EHDR* lib_ehdr, uintptr_t lib_base) {
|
|
700 |
int i = 0;
|
|
701 |
ELF_PHDR* phbuf;
|
|
702 |
ELF_PHDR* lib_php = NULL;
|
|
703 |
|
|
704 |
if ((phbuf = read_program_header_table(lib_fd, lib_ehdr)) == NULL)
|
|
705 |
return false;
|
|
706 |
|
|
707 |
// we want to process only PT_LOAD segments that are not writable.
|
|
708 |
// i.e., text segments. The read/write/exec (data) segments would
|
|
709 |
// have been already added from core file segments.
|
|
710 |
for (lib_php = phbuf, i = 0; i < lib_ehdr->e_phnum; i++) {
|
|
711 |
if ((lib_php->p_type == PT_LOAD) && !(lib_php->p_flags & PF_W) && (lib_php->p_filesz != 0)) {
|
|
712 |
if (add_map_info(ph, lib_fd, lib_php->p_offset, lib_php->p_vaddr + lib_base, lib_php->p_filesz) == NULL)
|
|
713 |
goto err;
|
|
714 |
}
|
|
715 |
lib_php++;
|
|
716 |
}
|
|
717 |
|
|
718 |
free(phbuf);
|
|
719 |
return true;
|
|
720 |
err:
|
|
721 |
free(phbuf);
|
|
722 |
return false;
|
|
723 |
}
|
|
724 |
|
|
725 |
// process segments from interpreter (ld.so or ld-linux.so)
|
|
726 |
static bool read_interp_segments(struct ps_prochandle* ph) {
|
|
727 |
ELF_EHDR interp_ehdr;
|
|
728 |
|
|
729 |
if (read_elf_header(ph->core->interp_fd, &interp_ehdr) != true) {
|
|
730 |
print_debug("interpreter is not a valid ELF file\n");
|
|
731 |
return false;
|
|
732 |
}
|
|
733 |
|
|
734 |
if (read_lib_segments(ph, ph->core->interp_fd, &interp_ehdr, ph->core->ld_base_addr) != true) {
|
|
735 |
print_debug("can't read segments of interpreter\n");
|
|
736 |
return false;
|
|
737 |
}
|
|
738 |
|
|
739 |
return true;
|
|
740 |
}
|
|
741 |
|
|
742 |
// process segments of a a.out
|
|
743 |
static bool read_exec_segments(struct ps_prochandle* ph, ELF_EHDR* exec_ehdr) {
|
|
744 |
int i = 0;
|
|
745 |
ELF_PHDR* phbuf = NULL;
|
|
746 |
ELF_PHDR* exec_php = NULL;
|
|
747 |
|
|
748 |
if ((phbuf = read_program_header_table(ph->core->exec_fd, exec_ehdr)) == NULL)
|
|
749 |
return false;
|
|
750 |
|
|
751 |
for (exec_php = phbuf, i = 0; i < exec_ehdr->e_phnum; i++) {
|
|
752 |
switch (exec_php->p_type) {
|
|
753 |
|
|
754 |
// add mappings for PT_LOAD segments
|
|
755 |
case PT_LOAD: {
|
|
756 |
// add only non-writable segments of non-zero filesz
|
|
757 |
if (!(exec_php->p_flags & PF_W) && exec_php->p_filesz != 0) {
|
|
758 |
if (add_map_info(ph, ph->core->exec_fd, exec_php->p_offset, exec_php->p_vaddr, exec_php->p_filesz) == NULL) goto err;
|
|
759 |
}
|
|
760 |
break;
|
|
761 |
}
|
|
762 |
|
|
763 |
// read the interpreter and it's segments
|
|
764 |
case PT_INTERP: {
|
|
765 |
char interp_name[BUF_SIZE];
|
|
766 |
|
|
767 |
pread(ph->core->exec_fd, interp_name, MIN(exec_php->p_filesz, BUF_SIZE), exec_php->p_offset);
|
|
768 |
print_debug("ELF interpreter %s\n", interp_name);
|
|
769 |
// read interpreter segments as well
|
|
770 |
if ((ph->core->interp_fd = pathmap_open(interp_name)) < 0) {
|
|
771 |
print_debug("can't open runtime loader\n");
|
|
772 |
goto err;
|
|
773 |
}
|
|
774 |
break;
|
|
775 |
}
|
|
776 |
|
|
777 |
// from PT_DYNAMIC we want to read address of first link_map addr
|
|
778 |
case PT_DYNAMIC: {
|
|
779 |
ph->core->dynamic_addr = exec_php->p_vaddr;
|
|
780 |
print_debug("address of _DYNAMIC is 0x%lx\n", ph->core->dynamic_addr);
|
|
781 |
break;
|
|
782 |
}
|
|
783 |
|
|
784 |
} // switch
|
|
785 |
exec_php++;
|
|
786 |
} // for
|
|
787 |
|
|
788 |
free(phbuf);
|
|
789 |
return true;
|
|
790 |
err:
|
|
791 |
free(phbuf);
|
|
792 |
return false;
|
|
793 |
}
|
|
794 |
|
|
795 |
|
|
796 |
#define FIRST_LINK_MAP_OFFSET offsetof(struct r_debug, r_map)
|
|
797 |
#define LD_BASE_OFFSET offsetof(struct r_debug, r_ldbase)
|
|
798 |
#define LINK_MAP_ADDR_OFFSET offsetof(struct link_map, l_addr)
|
|
799 |
#define LINK_MAP_NAME_OFFSET offsetof(struct link_map, l_name)
|
|
800 |
#define LINK_MAP_NEXT_OFFSET offsetof(struct link_map, l_next)
|
|
801 |
|
|
802 |
// read shared library info from runtime linker's data structures.
|
|
803 |
// This work is done by librtlb_db in Solaris
|
|
804 |
static bool read_shared_lib_info(struct ps_prochandle* ph) {
|
|
805 |
uintptr_t addr = ph->core->dynamic_addr;
|
|
806 |
uintptr_t debug_base;
|
|
807 |
uintptr_t first_link_map_addr;
|
|
808 |
uintptr_t ld_base_addr;
|
|
809 |
uintptr_t link_map_addr;
|
|
810 |
uintptr_t lib_base_diff;
|
|
811 |
uintptr_t lib_base;
|
|
812 |
uintptr_t lib_name_addr;
|
|
813 |
char lib_name[BUF_SIZE];
|
|
814 |
ELF_DYN dyn;
|
|
815 |
ELF_EHDR elf_ehdr;
|
|
816 |
int lib_fd;
|
|
817 |
|
|
818 |
// _DYNAMIC has information of the form
|
|
819 |
// [tag] [data] [tag] [data] .....
|
|
820 |
// Both tag and data are pointer sized.
|
|
821 |
// We look for dynamic info with DT_DEBUG. This has shared object info.
|
|
822 |
// refer to struct r_debug in link.h
|
|
823 |
|
|
824 |
dyn.d_tag = DT_NULL;
|
|
825 |
while (dyn.d_tag != DT_DEBUG) {
|
|
826 |
if (ps_pdread(ph, (psaddr_t) addr, &dyn, sizeof(ELF_DYN)) != PS_OK) {
|
|
827 |
print_debug("can't read debug info from _DYNAMIC\n");
|
|
828 |
return false;
|
|
829 |
}
|
|
830 |
addr += sizeof(ELF_DYN);
|
|
831 |
}
|
|
832 |
|
|
833 |
// we have got Dyn entry with DT_DEBUG
|
|
834 |
debug_base = dyn.d_un.d_ptr;
|
|
835 |
// at debug_base we have struct r_debug. This has first link map in r_map field
|
|
836 |
if (ps_pdread(ph, (psaddr_t) debug_base + FIRST_LINK_MAP_OFFSET,
|
|
837 |
&first_link_map_addr, sizeof(uintptr_t)) != PS_OK) {
|
|
838 |
print_debug("can't read first link map address\n");
|
|
839 |
return false;
|
|
840 |
}
|
|
841 |
|
|
842 |
// read ld_base address from struct r_debug
|
|
843 |
if (ps_pdread(ph, (psaddr_t) debug_base + LD_BASE_OFFSET, &ld_base_addr,
|
|
844 |
sizeof(uintptr_t)) != PS_OK) {
|
|
845 |
print_debug("can't read ld base address\n");
|
|
846 |
return false;
|
|
847 |
}
|
|
848 |
ph->core->ld_base_addr = ld_base_addr;
|
|
849 |
|
|
850 |
print_debug("interpreter base address is 0x%lx\n", ld_base_addr);
|
|
851 |
|
|
852 |
// now read segments from interp (i.e ld.so or ld-linux.so)
|
|
853 |
if (read_interp_segments(ph) != true)
|
|
854 |
return false;
|
|
855 |
|
|
856 |
// after adding interpreter (ld.so) mappings sort again
|
|
857 |
if (sort_map_array(ph) != true)
|
|
858 |
return false;
|
|
859 |
|
|
860 |
print_debug("first link map is at 0x%lx\n", first_link_map_addr);
|
|
861 |
|
|
862 |
link_map_addr = first_link_map_addr;
|
|
863 |
while (link_map_addr != 0) {
|
|
864 |
// read library base address of the .so. Note that even though <sys/link.h> calls
|
|
865 |
// link_map->l_addr as "base address", this is * not * really base virtual
|
|
866 |
// address of the shared object. This is actually the difference b/w the virtual
|
|
867 |
// address mentioned in shared object and the actual virtual base where runtime
|
|
868 |
// linker loaded it. We use "base diff" in read_lib_segments call below.
|
|
869 |
|
|
870 |
if (ps_pdread(ph, (psaddr_t) link_map_addr + LINK_MAP_ADDR_OFFSET,
|
|
871 |
&lib_base_diff, sizeof(uintptr_t)) != PS_OK) {
|
|
872 |
print_debug("can't read shared object base address diff\n");
|
|
873 |
return false;
|
|
874 |
}
|
|
875 |
|
|
876 |
// read address of the name
|
|
877 |
if (ps_pdread(ph, (psaddr_t) link_map_addr + LINK_MAP_NAME_OFFSET,
|
|
878 |
&lib_name_addr, sizeof(uintptr_t)) != PS_OK) {
|
|
879 |
print_debug("can't read address of shared object name\n");
|
|
880 |
return false;
|
|
881 |
}
|
|
882 |
|
|
883 |
// read name of the shared object
|
|
884 |
if (read_string(ph, (uintptr_t) lib_name_addr, lib_name, sizeof(lib_name)) != true) {
|
|
885 |
print_debug("can't read shared object name\n");
|
|
886 |
return false;
|
|
887 |
}
|
|
888 |
|
|
889 |
if (lib_name[0] != '\0') {
|
|
890 |
// ignore empty lib names
|
|
891 |
lib_fd = pathmap_open(lib_name);
|
|
892 |
|
|
893 |
if (lib_fd < 0) {
|
|
894 |
print_debug("can't open shared object %s\n", lib_name);
|
|
895 |
// continue with other libraries...
|
|
896 |
} else {
|
|
897 |
if (read_elf_header(lib_fd, &elf_ehdr)) {
|
|
898 |
lib_base = lib_base_diff + find_base_address(lib_fd, &elf_ehdr);
|
|
899 |
print_debug("reading library %s @ 0x%lx [ 0x%lx ]\n",
|
|
900 |
lib_name, lib_base, lib_base_diff);
|
|
901 |
// while adding library mappings we need to use "base difference".
|
|
902 |
if (! read_lib_segments(ph, lib_fd, &elf_ehdr, lib_base_diff)) {
|
|
903 |
print_debug("can't read shared object's segments\n");
|
|
904 |
close(lib_fd);
|
|
905 |
return false;
|
|
906 |
}
|
|
907 |
add_lib_info_fd(ph, lib_name, lib_fd, lib_base);
|
|
908 |
// Map info is added for the library (lib_name) so
|
|
909 |
// we need to re-sort it before calling the p_pdread.
|
|
910 |
if (sort_map_array(ph) != true)
|
|
911 |
return false;
|
|
912 |
} else {
|
|
913 |
print_debug("can't read ELF header for shared object %s\n", lib_name);
|
|
914 |
close(lib_fd);
|
|
915 |
// continue with other libraries...
|
|
916 |
}
|
|
917 |
}
|
|
918 |
}
|
|
919 |
|
|
920 |
// read next link_map address
|
|
921 |
if (ps_pdread(ph, (psaddr_t) link_map_addr + LINK_MAP_NEXT_OFFSET,
|
|
922 |
&link_map_addr, sizeof(uintptr_t)) != PS_OK) {
|
|
923 |
print_debug("can't read next link in link_map\n");
|
|
924 |
return false;
|
|
925 |
}
|
|
926 |
}
|
|
927 |
|
|
928 |
return true;
|
|
929 |
}
|
|
930 |
|
|
931 |
// the one and only one exposed stuff from this file
|
|
932 |
struct ps_prochandle* Pgrab_core(const char* exec_file, const char* core_file) {
|
|
933 |
ELF_EHDR core_ehdr;
|
|
934 |
ELF_EHDR exec_ehdr;
|
|
935 |
ELF_EHDR lib_ehdr;
|
|
936 |
|
|
937 |
struct ps_prochandle* ph = (struct ps_prochandle*) calloc(1, sizeof(struct ps_prochandle));
|
|
938 |
if (ph == NULL) {
|
|
939 |
print_debug("can't allocate ps_prochandle\n");
|
|
940 |
return NULL;
|
|
941 |
}
|
|
942 |
|
|
943 |
if ((ph->core = (struct core_data*) calloc(1, sizeof(struct core_data))) == NULL) {
|
|
944 |
free(ph);
|
|
945 |
print_debug("can't allocate ps_prochandle\n");
|
|
946 |
return NULL;
|
|
947 |
}
|
|
948 |
|
|
949 |
// initialize ph
|
|
950 |
ph->ops = &core_ops;
|
|
951 |
ph->core->core_fd = -1;
|
|
952 |
ph->core->exec_fd = -1;
|
|
953 |
ph->core->interp_fd = -1;
|
|
954 |
|
|
955 |
// open the core file
|
|
956 |
if ((ph->core->core_fd = open(core_file, O_RDONLY)) < 0) {
|
|
957 |
print_debug("can't open core file\n");
|
|
958 |
goto err;
|
|
959 |
}
|
|
960 |
|
|
961 |
// read core file ELF header
|
|
962 |
if (read_elf_header(ph->core->core_fd, &core_ehdr) != true || core_ehdr.e_type != ET_CORE) {
|
|
963 |
print_debug("core file is not a valid ELF ET_CORE file\n");
|
|
964 |
goto err;
|
|
965 |
}
|
|
966 |
|
|
967 |
if ((ph->core->exec_fd = open(exec_file, O_RDONLY)) < 0) {
|
|
968 |
print_debug("can't open executable file\n");
|
|
969 |
goto err;
|
|
970 |
}
|
|
971 |
|
|
972 |
if (read_elf_header(ph->core->exec_fd, &exec_ehdr) != true || exec_ehdr.e_type != ET_EXEC) {
|
|
973 |
print_debug("executable file is not a valid ELF ET_EXEC file\n");
|
|
974 |
goto err;
|
|
975 |
}
|
|
976 |
|
|
977 |
// process core file segments
|
|
978 |
if (read_core_segments(ph, &core_ehdr) != true)
|
|
979 |
goto err;
|
|
980 |
|
|
981 |
// process exec file segments
|
|
982 |
if (read_exec_segments(ph, &exec_ehdr) != true)
|
|
983 |
goto err;
|
|
984 |
|
|
985 |
// exec file is also treated like a shared object for symbol search
|
|
986 |
if (add_lib_info_fd(ph, exec_file, ph->core->exec_fd,
|
|
987 |
(uintptr_t)0 + find_base_address(ph->core->exec_fd, &exec_ehdr)) == NULL)
|
|
988 |
goto err;
|
|
989 |
|
|
990 |
// allocate and sort maps into map_array, we need to do this
|
|
991 |
// here because read_shared_lib_info needs to read from debuggee
|
|
992 |
// address space
|
|
993 |
if (sort_map_array(ph) != true)
|
|
994 |
goto err;
|
|
995 |
|
|
996 |
if (read_shared_lib_info(ph) != true)
|
|
997 |
goto err;
|
|
998 |
|
|
999 |
// sort again because we have added more mappings from shared objects
|
|
1000 |
if (sort_map_array(ph) != true)
|
|
1001 |
goto err;
|
|
1002 |
|
|
1003 |
if (init_classsharing_workaround(ph) != true)
|
|
1004 |
goto err;
|
|
1005 |
|
|
1006 |
return ph;
|
|
1007 |
|
|
1008 |
err:
|
|
1009 |
Prelease(ph);
|
|
1010 |
return NULL;
|
|
1011 |
}
|