Mercurial > hg > truffle
comparison agent/src/os/bsd/libproc_impl.c @ 3960:f08d439fab8c
7089790: integrate bsd-port changes
Reviewed-by: kvn, twisti, jrose
Contributed-by: Kurt Miller <kurt@intricatesoftware.com>, Greg Lewis <glewis@eyesbeyond.com>, Jung-uk Kim <jkim@freebsd.org>, Christos Zoulas <christos@zoulas.com>, Landon Fuller <landonf@plausible.coop>, The FreeBSD Foundation <board@freebsdfoundation.org>, Michael Franz <mvfranz@gmail.com>, Roger Hoover <rhoover@apple.com>, Alexander Strange <astrange@apple.com>
author | never |
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date | Sun, 25 Sep 2011 16:03:29 -0700 |
parents | |
children | 2394a89e89f4 |
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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 } |