3960
|
1 /*
|
|
2 * Copyright (c) 2003, 2010, Oracle and/or its affiliates. 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 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 #include <stdarg.h>
|
|
25 #include <stdio.h>
|
|
26 #include <stdlib.h>
|
|
27 #include <string.h>
|
|
28 #include <fcntl.h>
|
|
29 #include <thread_db.h>
|
|
30 #include "libproc_impl.h"
|
|
31
|
|
32 static const char* alt_root = NULL;
|
|
33 static int alt_root_len = -1;
|
|
34
|
|
35 #define SA_ALTROOT "SA_ALTROOT"
|
|
36
|
|
37 static void init_alt_root() {
|
|
38 if (alt_root_len == -1) {
|
|
39 alt_root = getenv(SA_ALTROOT);
|
|
40 if (alt_root) {
|
|
41 alt_root_len = strlen(alt_root);
|
|
42 } else {
|
|
43 alt_root_len = 0;
|
|
44 }
|
|
45 }
|
|
46 }
|
|
47
|
|
48 int pathmap_open(const char* name) {
|
|
49 int fd;
|
|
50 char alt_path[PATH_MAX + 1];
|
|
51
|
|
52 init_alt_root();
|
|
53 fd = open(name, O_RDONLY);
|
|
54 if (fd >= 0) {
|
|
55 return fd;
|
|
56 }
|
|
57
|
|
58 if (alt_root_len > 0) {
|
|
59 strcpy(alt_path, alt_root);
|
|
60 strcat(alt_path, name);
|
|
61 fd = open(alt_path, O_RDONLY);
|
|
62 if (fd >= 0) {
|
|
63 print_debug("path %s substituted for %s\n", alt_path, name);
|
|
64 return fd;
|
|
65 }
|
|
66
|
|
67 if (strrchr(name, '/')) {
|
|
68 strcpy(alt_path, alt_root);
|
|
69 strcat(alt_path, strrchr(name, '/'));
|
|
70 fd = open(alt_path, O_RDONLY);
|
|
71 if (fd >= 0) {
|
|
72 print_debug("path %s substituted for %s\n", alt_path, name);
|
|
73 return fd;
|
|
74 }
|
|
75 }
|
|
76 }
|
|
77
|
|
78 return -1;
|
|
79 }
|
|
80
|
|
81 static bool _libsaproc_debug;
|
|
82
|
|
83 void print_debug(const char* format,...) {
|
|
84 if (_libsaproc_debug) {
|
|
85 va_list alist;
|
|
86
|
|
87 va_start(alist, format);
|
|
88 fputs("libsaproc DEBUG: ", stderr);
|
|
89 vfprintf(stderr, format, alist);
|
|
90 va_end(alist);
|
|
91 }
|
|
92 }
|
|
93
|
|
94 bool is_debug() {
|
|
95 return _libsaproc_debug;
|
|
96 }
|
|
97
|
|
98 // initialize libproc
|
|
99 bool init_libproc(bool debug) {
|
|
100 // init debug mode
|
|
101 _libsaproc_debug = debug;
|
|
102
|
|
103 // initialize the thread_db library
|
|
104 if (td_init() != TD_OK) {
|
|
105 print_debug("libthread_db's td_init failed\n");
|
|
106 return false;
|
|
107 }
|
|
108
|
|
109 return true;
|
|
110 }
|
|
111
|
|
112 static void destroy_lib_info(struct ps_prochandle* ph) {
|
|
113 lib_info* lib = ph->libs;
|
|
114 while (lib) {
|
|
115 lib_info *next = lib->next;
|
|
116 if (lib->symtab) {
|
|
117 destroy_symtab(lib->symtab);
|
|
118 }
|
|
119 free(lib);
|
|
120 lib = next;
|
|
121 }
|
|
122 }
|
|
123
|
|
124 static void destroy_thread_info(struct ps_prochandle* ph) {
|
|
125 thread_info* thr = ph->threads;
|
|
126 while (thr) {
|
|
127 thread_info *next = thr->next;
|
|
128 free(thr);
|
|
129 thr = next;
|
|
130 }
|
|
131 }
|
|
132
|
|
133 // ps_prochandle cleanup
|
|
134
|
|
135 // ps_prochandle cleanup
|
|
136 void Prelease(struct ps_prochandle* ph) {
|
|
137 // do the "derived class" clean-up first
|
|
138 ph->ops->release(ph);
|
|
139 destroy_lib_info(ph);
|
|
140 destroy_thread_info(ph);
|
|
141 free(ph);
|
|
142 }
|
|
143
|
|
144 lib_info* add_lib_info(struct ps_prochandle* ph, const char* libname, uintptr_t base) {
|
|
145 return add_lib_info_fd(ph, libname, -1, base);
|
|
146 }
|
|
147
|
|
148 lib_info* add_lib_info_fd(struct ps_prochandle* ph, const char* libname, int fd, uintptr_t base) {
|
|
149 lib_info* newlib;
|
|
150
|
|
151 if ( (newlib = (lib_info*) calloc(1, sizeof(struct lib_info))) == NULL) {
|
|
152 print_debug("can't allocate memory for lib_info\n");
|
|
153 return NULL;
|
|
154 }
|
|
155
|
|
156 strncpy(newlib->name, libname, sizeof(newlib->name));
|
|
157 newlib->base = base;
|
|
158
|
|
159 if (fd == -1) {
|
|
160 if ( (newlib->fd = pathmap_open(newlib->name)) < 0) {
|
|
161 print_debug("can't open shared object %s\n", newlib->name);
|
|
162 free(newlib);
|
|
163 return NULL;
|
|
164 }
|
|
165 } else {
|
|
166 newlib->fd = fd;
|
|
167 }
|
|
168
|
|
169 // check whether we have got an ELF file. /proc/<pid>/map
|
|
170 // gives out all file mappings and not just shared objects
|
|
171 if (is_elf_file(newlib->fd) == false) {
|
|
172 close(newlib->fd);
|
|
173 free(newlib);
|
|
174 return NULL;
|
|
175 }
|
|
176
|
|
177 newlib->symtab = build_symtab(newlib->fd);
|
|
178 if (newlib->symtab == NULL) {
|
|
179 print_debug("symbol table build failed for %s\n", newlib->name);
|
|
180 }
|
|
181 else {
|
|
182 print_debug("built symbol table for %s\n", newlib->name);
|
|
183 }
|
|
184
|
|
185 // even if symbol table building fails, we add the lib_info.
|
|
186 // This is because we may need to read from the ELF file for core file
|
|
187 // address read functionality. lookup_symbol checks for NULL symtab.
|
|
188 if (ph->libs) {
|
|
189 ph->lib_tail->next = newlib;
|
|
190 ph->lib_tail = newlib;
|
|
191 } else {
|
|
192 ph->libs = ph->lib_tail = newlib;
|
|
193 }
|
|
194 ph->num_libs++;
|
|
195
|
|
196 return newlib;
|
|
197 }
|
|
198
|
|
199 // lookup for a specific symbol
|
|
200 uintptr_t lookup_symbol(struct ps_prochandle* ph, const char* object_name,
|
|
201 const char* sym_name) {
|
|
202 // ignore object_name. search in all libraries
|
|
203 // FIXME: what should we do with object_name?? The library names are obtained
|
|
204 // by parsing /proc/<pid>/maps, which may not be the same as object_name.
|
|
205 // What we need is a utility to map object_name to real file name, something
|
|
206 // dlopen() does by looking at LD_LIBRARY_PATH and /etc/ld.so.cache. For
|
|
207 // now, we just ignore object_name and do a global search for the symbol.
|
|
208
|
|
209 lib_info* lib = ph->libs;
|
|
210 while (lib) {
|
|
211 if (lib->symtab) {
|
|
212 uintptr_t res = search_symbol(lib->symtab, lib->base, sym_name, NULL);
|
|
213 if (res) return res;
|
|
214 }
|
|
215 lib = lib->next;
|
|
216 }
|
|
217
|
|
218 print_debug("lookup failed for symbol '%s' in obj '%s'\n",
|
|
219 sym_name, object_name);
|
|
220 return (uintptr_t) NULL;
|
|
221 }
|
|
222
|
|
223
|
|
224 const char* symbol_for_pc(struct ps_prochandle* ph, uintptr_t addr, uintptr_t* poffset) {
|
|
225 const char* res = NULL;
|
|
226 lib_info* lib = ph->libs;
|
|
227 while (lib) {
|
|
228 if (lib->symtab && addr >= lib->base) {
|
|
229 res = nearest_symbol(lib->symtab, addr - lib->base, poffset);
|
|
230 if (res) return res;
|
|
231 }
|
|
232 lib = lib->next;
|
|
233 }
|
|
234 return NULL;
|
|
235 }
|
|
236
|
|
237 // add a thread to ps_prochandle
|
|
238 thread_info* add_thread_info(struct ps_prochandle* ph, pthread_t pthread_id, lwpid_t lwp_id) {
|
|
239 thread_info* newthr;
|
|
240 if ( (newthr = (thread_info*) calloc(1, sizeof(thread_info))) == NULL) {
|
|
241 print_debug("can't allocate memory for thread_info\n");
|
|
242 return NULL;
|
|
243 }
|
|
244
|
|
245 // initialize thread info
|
|
246 newthr->pthread_id = pthread_id;
|
|
247 newthr->lwp_id = lwp_id;
|
|
248
|
|
249 // add new thread to the list
|
|
250 newthr->next = ph->threads;
|
|
251 ph->threads = newthr;
|
|
252 ph->num_threads++;
|
|
253 return newthr;
|
|
254 }
|
|
255
|
|
256
|
|
257 // struct used for client data from thread_db callback
|
|
258 struct thread_db_client_data {
|
|
259 struct ps_prochandle* ph;
|
|
260 thread_info_callback callback;
|
|
261 };
|
|
262
|
|
263 // callback function for libthread_db
|
|
264 static int thread_db_callback(const td_thrhandle_t *th_p, void *data) {
|
|
265 struct thread_db_client_data* ptr = (struct thread_db_client_data*) data;
|
|
266 td_thrinfo_t ti;
|
|
267 td_err_e err;
|
|
268
|
|
269 memset(&ti, 0, sizeof(ti));
|
|
270 err = td_thr_get_info(th_p, &ti);
|
|
271 if (err != TD_OK) {
|
|
272 print_debug("libthread_db : td_thr_get_info failed, can't get thread info\n");
|
|
273 return err;
|
|
274 }
|
|
275
|
|
276 print_debug("thread_db : pthread %d (lwp %d)\n", ti.ti_tid, ti.ti_lid);
|
|
277
|
|
278 if (ptr->callback(ptr->ph, (pthread_t)ti.ti_tid, ti.ti_lid) != true)
|
|
279 return TD_ERR;
|
|
280
|
|
281 return TD_OK;
|
|
282 }
|
|
283
|
|
284 // read thread_info using libthread_db
|
|
285 bool read_thread_info(struct ps_prochandle* ph, thread_info_callback cb) {
|
|
286 struct thread_db_client_data mydata;
|
|
287 td_thragent_t* thread_agent = NULL;
|
|
288 if (td_ta_new(ph, &thread_agent) != TD_OK) {
|
|
289 print_debug("can't create libthread_db agent\n");
|
|
290 return false;
|
|
291 }
|
|
292
|
|
293 mydata.ph = ph;
|
|
294 mydata.callback = cb;
|
|
295
|
|
296 // we use libthread_db iterator to iterate thru list of threads.
|
|
297 if (td_ta_thr_iter(thread_agent, thread_db_callback, &mydata,
|
|
298 TD_THR_ANY_STATE, TD_THR_LOWEST_PRIORITY,
|
|
299 TD_SIGNO_MASK, TD_THR_ANY_USER_FLAGS) != TD_OK) {
|
|
300 td_ta_delete(thread_agent);
|
|
301 return false;
|
|
302 }
|
|
303
|
|
304 // delete thread agent
|
|
305 td_ta_delete(thread_agent);
|
|
306 return true;
|
|
307 }
|
|
308
|
|
309
|
|
310 // get number of threads
|
|
311 int get_num_threads(struct ps_prochandle* ph) {
|
|
312 return ph->num_threads;
|
|
313 }
|
|
314
|
|
315 // get lwp_id of n'th thread
|
|
316 lwpid_t get_lwp_id(struct ps_prochandle* ph, int index) {
|
|
317 int count = 0;
|
|
318 thread_info* thr = ph->threads;
|
|
319 while (thr) {
|
|
320 if (count == index) {
|
|
321 return thr->lwp_id;
|
|
322 }
|
|
323 count++;
|
|
324 thr = thr->next;
|
|
325 }
|
|
326 return -1;
|
|
327 }
|
|
328
|
|
329 // get regs for a given lwp
|
|
330 bool get_lwp_regs(struct ps_prochandle* ph, lwpid_t lwp_id, struct reg* regs) {
|
|
331 return ph->ops->get_lwp_regs(ph, lwp_id, regs);
|
|
332 }
|
|
333
|
|
334 // get number of shared objects
|
|
335 int get_num_libs(struct ps_prochandle* ph) {
|
|
336 return ph->num_libs;
|
|
337 }
|
|
338
|
|
339 // get name of n'th solib
|
|
340 const char* get_lib_name(struct ps_prochandle* ph, int index) {
|
|
341 int count = 0;
|
|
342 lib_info* lib = ph->libs;
|
|
343 while (lib) {
|
|
344 if (count == index) {
|
|
345 return lib->name;
|
|
346 }
|
|
347 count++;
|
|
348 lib = lib->next;
|
|
349 }
|
|
350 return NULL;
|
|
351 }
|
|
352
|
|
353 // get base address of a lib
|
|
354 uintptr_t get_lib_base(struct ps_prochandle* ph, int index) {
|
|
355 int count = 0;
|
|
356 lib_info* lib = ph->libs;
|
|
357 while (lib) {
|
|
358 if (count == index) {
|
|
359 return lib->base;
|
|
360 }
|
|
361 count++;
|
|
362 lib = lib->next;
|
|
363 }
|
|
364 return (uintptr_t)NULL;
|
|
365 }
|
|
366
|
|
367 bool find_lib(struct ps_prochandle* ph, const char *lib_name) {
|
|
368 lib_info *p = ph->libs;
|
|
369 while (p) {
|
|
370 if (strcmp(p->name, lib_name) == 0) {
|
|
371 return true;
|
|
372 }
|
|
373 p = p->next;
|
|
374 }
|
|
375 return false;
|
|
376 }
|
|
377
|
|
378 //--------------------------------------------------------------------------
|
|
379 // proc service functions
|
|
380
|
|
381 // ps_pglobal_lookup() looks up the symbol sym_name in the symbol table
|
|
382 // of the load object object_name in the target process identified by ph.
|
|
383 // It returns the symbol's value as an address in the target process in
|
|
384 // *sym_addr.
|
|
385
|
|
386 ps_err_e ps_pglobal_lookup(struct ps_prochandle *ph, const char *object_name,
|
|
387 const char *sym_name, psaddr_t *sym_addr) {
|
|
388 *sym_addr = (psaddr_t) lookup_symbol(ph, object_name, sym_name);
|
|
389 return (*sym_addr ? PS_OK : PS_NOSYM);
|
|
390 }
|
|
391
|
|
392 // read "size" bytes info "buf" from address "addr"
|
|
393 ps_err_e ps_pread(struct ps_prochandle *ph, psaddr_t addr,
|
|
394 void *buf, size_t size) {
|
|
395 return ph->ops->p_pread(ph, (uintptr_t) addr, buf, size)? PS_OK: PS_ERR;
|
|
396 }
|
|
397
|
|
398 // write "size" bytes of data to debuggee at address "addr"
|
|
399 ps_err_e ps_pwrite(struct ps_prochandle *ph, psaddr_t addr,
|
|
400 const void *buf, size_t size) {
|
|
401 return ph->ops->p_pwrite(ph, (uintptr_t)addr, buf, size)? PS_OK: PS_ERR;
|
|
402 }
|
|
403
|
|
404 // fill in ptrace_lwpinfo for lid
|
|
405 ps_err_e ps_linfo(struct ps_prochandle *ph, lwpid_t lwp_id, void *linfo) {
|
|
406 return ph->ops->get_lwp_info(ph, lwp_id, linfo)? PS_OK: PS_ERR;
|
|
407 }
|
|
408
|
|
409 // needed for when libthread_db is compiled with TD_DEBUG defined
|
|
410 void
|
|
411 ps_plog (const char *format, ...)
|
|
412 {
|
|
413 va_list alist;
|
|
414
|
|
415 va_start(alist, format);
|
|
416 vfprintf(stderr, format, alist);
|
|
417 va_end(alist);
|
|
418 }
|
|
419
|
|
420 // ------------------------------------------------------------------------
|
|
421 // Functions below this point are not yet implemented. They are here only
|
|
422 // to make the linker happy.
|
|
423
|
|
424 ps_err_e ps_lsetfpregs(struct ps_prochandle *ph, lwpid_t lid, const prfpregset_t *fpregs) {
|
|
425 print_debug("ps_lsetfpregs not implemented\n");
|
|
426 return PS_OK;
|
|
427 }
|
|
428
|
|
429 ps_err_e ps_lsetregs(struct ps_prochandle *ph, lwpid_t lid, const prgregset_t gregset) {
|
|
430 print_debug("ps_lsetregs not implemented\n");
|
|
431 return PS_OK;
|
|
432 }
|
|
433
|
|
434 ps_err_e ps_lgetfpregs(struct ps_prochandle *ph, lwpid_t lid, prfpregset_t *fpregs) {
|
|
435 print_debug("ps_lgetfpregs not implemented\n");
|
|
436 return PS_OK;
|
|
437 }
|
|
438
|
|
439 ps_err_e ps_lgetregs(struct ps_prochandle *ph, lwpid_t lid, prgregset_t gregset) {
|
|
440 print_debug("ps_lgetfpregs not implemented\n");
|
|
441 return PS_OK;
|
|
442 }
|
|
443
|
|
444 ps_err_e ps_lstop(struct ps_prochandle *ph, lwpid_t lid) {
|
|
445 print_debug("ps_lstop not implemented\n");
|
|
446 return PS_OK;
|
|
447 }
|
|
448
|
|
449 ps_err_e ps_pcontinue(struct ps_prochandle *ph) {
|
|
450 print_debug("ps_pcontinue not implemented\n");
|
|
451 return PS_OK;
|
|
452 }
|