Mercurial > hg > truffle
annotate agent/src/os/linux/libproc_impl.c @ 6117:4434fdad6b37
Merge
author | dholmes |
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date | Sat, 02 Jun 2012 07:32:21 -0400 |
parents | 54d3535a6dd3 |
children | 2394a89e89f4 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2003, 2012, 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 #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 | |
54 if (alt_root_len > 0) { | |
55 strcpy(alt_path, alt_root); | |
56 strcat(alt_path, name); | |
57 fd = open(alt_path, O_RDONLY); | |
58 if (fd >= 0) { | |
59 print_debug("path %s substituted for %s\n", alt_path, name); | |
60 return fd; | |
61 } | |
62 | |
63 if (strrchr(name, '/')) { | |
64 strcpy(alt_path, alt_root); | |
65 strcat(alt_path, strrchr(name, '/')); | |
66 fd = open(alt_path, O_RDONLY); | |
67 if (fd >= 0) { | |
68 print_debug("path %s substituted for %s\n", alt_path, name); | |
69 return fd; | |
70 } | |
71 } | |
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72 } else { |
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73 fd = open(name, O_RDONLY); |
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74 if (fd >= 0) { |
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75 return fd; |
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76 } |
0 | 77 } |
78 | |
79 return -1; | |
80 } | |
81 | |
82 static bool _libsaproc_debug; | |
83 | |
84 void print_debug(const char* format,...) { | |
85 if (_libsaproc_debug) { | |
86 va_list alist; | |
87 | |
88 va_start(alist, format); | |
89 fputs("libsaproc DEBUG: ", stderr); | |
90 vfprintf(stderr, format, alist); | |
91 va_end(alist); | |
92 } | |
93 } | |
94 | |
95 bool is_debug() { | |
96 return _libsaproc_debug; | |
97 } | |
98 | |
99 // initialize libproc | |
100 bool init_libproc(bool debug) { | |
101 // init debug mode | |
102 _libsaproc_debug = debug; | |
103 | |
104 // initialize the thread_db library | |
105 if (td_init() != TD_OK) { | |
106 print_debug("libthread_db's td_init failed\n"); | |
107 return false; | |
108 } | |
109 | |
110 return true; | |
111 } | |
112 | |
113 static void destroy_lib_info(struct ps_prochandle* ph) { | |
114 lib_info* lib = ph->libs; | |
115 while (lib) { | |
116 lib_info *next = lib->next; | |
117 if (lib->symtab) { | |
118 destroy_symtab(lib->symtab); | |
119 } | |
120 free(lib); | |
121 lib = next; | |
122 } | |
123 } | |
124 | |
125 static void destroy_thread_info(struct ps_prochandle* ph) { | |
126 thread_info* thr = ph->threads; | |
127 while (thr) { | |
128 thread_info *next = thr->next; | |
129 free(thr); | |
130 thr = next; | |
131 } | |
132 } | |
133 | |
134 // ps_prochandle cleanup | |
135 | |
136 // ps_prochandle cleanup | |
137 void Prelease(struct ps_prochandle* ph) { | |
138 // do the "derived class" clean-up first | |
139 ph->ops->release(ph); | |
140 destroy_lib_info(ph); | |
141 destroy_thread_info(ph); | |
142 free(ph); | |
143 } | |
144 | |
145 lib_info* add_lib_info(struct ps_prochandle* ph, const char* libname, uintptr_t base) { | |
146 return add_lib_info_fd(ph, libname, -1, base); | |
147 } | |
148 | |
149 lib_info* add_lib_info_fd(struct ps_prochandle* ph, const char* libname, int fd, uintptr_t base) { | |
150 lib_info* newlib; | |
151 | |
152 if ( (newlib = (lib_info*) calloc(1, sizeof(struct lib_info))) == NULL) { | |
153 print_debug("can't allocate memory for lib_info\n"); | |
154 return NULL; | |
155 } | |
156 | |
157 strncpy(newlib->name, libname, sizeof(newlib->name)); | |
158 newlib->base = base; | |
159 | |
160 if (fd == -1) { | |
161 if ( (newlib->fd = pathmap_open(newlib->name)) < 0) { | |
162 print_debug("can't open shared object %s\n", newlib->name); | |
163 free(newlib); | |
164 return NULL; | |
165 } | |
166 } else { | |
167 newlib->fd = fd; | |
168 } | |
169 | |
170 // check whether we have got an ELF file. /proc/<pid>/map | |
171 // gives out all file mappings and not just shared objects | |
172 if (is_elf_file(newlib->fd) == false) { | |
173 close(newlib->fd); | |
174 free(newlib); | |
175 return NULL; | |
176 } | |
177 | |
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178 newlib->symtab = build_symtab(newlib->fd, libname); |
0 | 179 if (newlib->symtab == NULL) { |
180 print_debug("symbol table build failed for %s\n", newlib->name); | |
181 } | |
182 | |
183 // even if symbol table building fails, we add the lib_info. | |
184 // This is because we may need to read from the ELF file for core file | |
185 // address read functionality. lookup_symbol checks for NULL symtab. | |
186 if (ph->libs) { | |
187 ph->lib_tail->next = newlib; | |
188 ph->lib_tail = newlib; | |
189 } else { | |
190 ph->libs = ph->lib_tail = newlib; | |
191 } | |
192 ph->num_libs++; | |
193 | |
194 return newlib; | |
195 } | |
196 | |
197 // lookup for a specific symbol | |
198 uintptr_t lookup_symbol(struct ps_prochandle* ph, const char* object_name, | |
199 const char* sym_name) { | |
200 // ignore object_name. search in all libraries | |
201 // FIXME: what should we do with object_name?? The library names are obtained | |
202 // by parsing /proc/<pid>/maps, which may not be the same as object_name. | |
203 // What we need is a utility to map object_name to real file name, something | |
204 // dlopen() does by looking at LD_LIBRARY_PATH and /etc/ld.so.cache. For | |
205 // now, we just ignore object_name and do a global search for the symbol. | |
206 | |
207 lib_info* lib = ph->libs; | |
208 while (lib) { | |
209 if (lib->symtab) { | |
210 uintptr_t res = search_symbol(lib->symtab, lib->base, sym_name, NULL); | |
211 if (res) return res; | |
212 } | |
213 lib = lib->next; | |
214 } | |
215 | |
216 print_debug("lookup failed for symbol '%s' in obj '%s'\n", | |
217 sym_name, object_name); | |
218 return (uintptr_t) NULL; | |
219 } | |
220 | |
221 | |
222 const char* symbol_for_pc(struct ps_prochandle* ph, uintptr_t addr, uintptr_t* poffset) { | |
223 const char* res = NULL; | |
224 lib_info* lib = ph->libs; | |
225 while (lib) { | |
226 if (lib->symtab && addr >= lib->base) { | |
227 res = nearest_symbol(lib->symtab, addr - lib->base, poffset); | |
228 if (res) return res; | |
229 } | |
230 lib = lib->next; | |
231 } | |
232 return NULL; | |
233 } | |
234 | |
235 // add a thread to ps_prochandle | |
236 thread_info* add_thread_info(struct ps_prochandle* ph, pthread_t pthread_id, lwpid_t lwp_id) { | |
237 thread_info* newthr; | |
238 if ( (newthr = (thread_info*) calloc(1, sizeof(thread_info))) == NULL) { | |
239 print_debug("can't allocate memory for thread_info\n"); | |
240 return NULL; | |
241 } | |
242 | |
243 // initialize thread info | |
244 newthr->pthread_id = pthread_id; | |
245 newthr->lwp_id = lwp_id; | |
246 | |
247 // add new thread to the list | |
248 newthr->next = ph->threads; | |
249 ph->threads = newthr; | |
250 ph->num_threads++; | |
251 return newthr; | |
252 } | |
253 | |
254 | |
255 // struct used for client data from thread_db callback | |
256 struct thread_db_client_data { | |
257 struct ps_prochandle* ph; | |
258 thread_info_callback callback; | |
259 }; | |
260 | |
261 // callback function for libthread_db | |
262 static int thread_db_callback(const td_thrhandle_t *th_p, void *data) { | |
263 struct thread_db_client_data* ptr = (struct thread_db_client_data*) data; | |
264 td_thrinfo_t ti; | |
265 td_err_e err; | |
266 | |
267 memset(&ti, 0, sizeof(ti)); | |
268 err = td_thr_get_info(th_p, &ti); | |
269 if (err != TD_OK) { | |
270 print_debug("libthread_db : td_thr_get_info failed, can't get thread info\n"); | |
271 return err; | |
272 } | |
273 | |
274 print_debug("thread_db : pthread %d (lwp %d)\n", ti.ti_tid, ti.ti_lid); | |
275 | |
276 if (ptr->callback(ptr->ph, ti.ti_tid, ti.ti_lid) != true) | |
277 return TD_ERR; | |
278 | |
279 return TD_OK; | |
280 } | |
281 | |
282 // read thread_info using libthread_db | |
283 bool read_thread_info(struct ps_prochandle* ph, thread_info_callback cb) { | |
284 struct thread_db_client_data mydata; | |
285 td_thragent_t* thread_agent = NULL; | |
286 if (td_ta_new(ph, &thread_agent) != TD_OK) { | |
287 print_debug("can't create libthread_db agent\n"); | |
288 return false; | |
289 } | |
290 | |
291 mydata.ph = ph; | |
292 mydata.callback = cb; | |
293 | |
294 // we use libthread_db iterator to iterate thru list of threads. | |
295 if (td_ta_thr_iter(thread_agent, thread_db_callback, &mydata, | |
296 TD_THR_ANY_STATE, TD_THR_LOWEST_PRIORITY, | |
297 TD_SIGNO_MASK, TD_THR_ANY_USER_FLAGS) != TD_OK) { | |
298 td_ta_delete(thread_agent); | |
299 return false; | |
300 } | |
301 | |
302 // delete thread agent | |
303 td_ta_delete(thread_agent); | |
304 return true; | |
305 } | |
306 | |
307 | |
308 // get number of threads | |
309 int get_num_threads(struct ps_prochandle* ph) { | |
310 return ph->num_threads; | |
311 } | |
312 | |
313 // get lwp_id of n'th thread | |
314 lwpid_t get_lwp_id(struct ps_prochandle* ph, int index) { | |
315 int count = 0; | |
316 thread_info* thr = ph->threads; | |
317 while (thr) { | |
318 if (count == index) { | |
319 return thr->lwp_id; | |
320 } | |
321 count++; | |
322 thr = thr->next; | |
323 } | |
324 return -1; | |
325 } | |
326 | |
327 // get regs for a given lwp | |
328 bool get_lwp_regs(struct ps_prochandle* ph, lwpid_t lwp_id, struct user_regs_struct* regs) { | |
329 return ph->ops->get_lwp_regs(ph, lwp_id, regs); | |
330 } | |
331 | |
332 // get number of shared objects | |
333 int get_num_libs(struct ps_prochandle* ph) { | |
334 return ph->num_libs; | |
335 } | |
336 | |
337 // get name of n'th solib | |
338 const char* get_lib_name(struct ps_prochandle* ph, int index) { | |
339 int count = 0; | |
340 lib_info* lib = ph->libs; | |
341 while (lib) { | |
342 if (count == index) { | |
343 return lib->name; | |
344 } | |
345 count++; | |
346 lib = lib->next; | |
347 } | |
348 return NULL; | |
349 } | |
350 | |
351 // get base address of a lib | |
352 uintptr_t get_lib_base(struct ps_prochandle* ph, int index) { | |
353 int count = 0; | |
354 lib_info* lib = ph->libs; | |
355 while (lib) { | |
356 if (count == index) { | |
357 return lib->base; | |
358 } | |
359 count++; | |
360 lib = lib->next; | |
361 } | |
362 return (uintptr_t)NULL; | |
363 } | |
364 | |
365 bool find_lib(struct ps_prochandle* ph, const char *lib_name) { | |
366 lib_info *p = ph->libs; | |
367 while (p) { | |
368 if (strcmp(p->name, lib_name) == 0) { | |
369 return true; | |
370 } | |
371 p = p->next; | |
372 } | |
373 return false; | |
374 } | |
375 | |
376 //-------------------------------------------------------------------------- | |
377 // proc service functions | |
378 | |
379 // get process id | |
380 pid_t ps_getpid(struct ps_prochandle *ph) { | |
381 return ph->pid; | |
382 } | |
383 | |
384 // ps_pglobal_lookup() looks up the symbol sym_name in the symbol table | |
385 // of the load object object_name in the target process identified by ph. | |
386 // It returns the symbol's value as an address in the target process in | |
387 // *sym_addr. | |
388 | |
389 ps_err_e ps_pglobal_lookup(struct ps_prochandle *ph, const char *object_name, | |
390 const char *sym_name, psaddr_t *sym_addr) { | |
391 *sym_addr = (psaddr_t) lookup_symbol(ph, object_name, sym_name); | |
392 return (*sym_addr ? PS_OK : PS_NOSYM); | |
393 } | |
394 | |
395 // read "size" bytes info "buf" from address "addr" | |
396 ps_err_e ps_pdread(struct ps_prochandle *ph, psaddr_t addr, | |
397 void *buf, size_t size) { | |
398 return ph->ops->p_pread(ph, (uintptr_t) addr, buf, size)? PS_OK: PS_ERR; | |
399 } | |
400 | |
401 // write "size" bytes of data to debuggee at address "addr" | |
402 ps_err_e ps_pdwrite(struct ps_prochandle *ph, psaddr_t addr, | |
403 const void *buf, size_t size) { | |
404 return ph->ops->p_pwrite(ph, (uintptr_t)addr, buf, size)? PS_OK: PS_ERR; | |
405 } | |
406 | |
407 // ------------------------------------------------------------------------ | |
408 // Functions below this point are not yet implemented. They are here only | |
409 // to make the linker happy. | |
410 | |
411 ps_err_e ps_lsetfpregs(struct ps_prochandle *ph, lwpid_t lid, const prfpregset_t *fpregs) { | |
412 print_debug("ps_lsetfpregs not implemented\n"); | |
413 return PS_OK; | |
414 } | |
415 | |
416 ps_err_e ps_lsetregs(struct ps_prochandle *ph, lwpid_t lid, const prgregset_t gregset) { | |
417 print_debug("ps_lsetregs not implemented\n"); | |
418 return PS_OK; | |
419 } | |
420 | |
421 ps_err_e ps_lgetfpregs(struct ps_prochandle *ph, lwpid_t lid, prfpregset_t *fpregs) { | |
422 print_debug("ps_lgetfpregs not implemented\n"); | |
423 return PS_OK; | |
424 } | |
425 | |
426 ps_err_e ps_lgetregs(struct ps_prochandle *ph, lwpid_t lid, prgregset_t gregset) { | |
427 print_debug("ps_lgetfpregs not implemented\n"); | |
428 return PS_OK; | |
429 } | |
430 | |
431 // new libthread_db of NPTL seem to require this symbol | |
432 ps_err_e ps_get_thread_area() { | |
433 print_debug("ps_get_thread_area not implemented\n"); | |
434 return PS_OK; | |
435 } |