Mercurial > hg > graal-compiler
annotate agent/src/os/linux/libproc_impl.c @ 1908:f195c4737aca
6994130: Zero PowerPC fix
Summary: 6953477 broke Zero.
Reviewed-by: twisti
Contributed-by: Gary Benson <gbenson@redhat.com>
author | twisti |
---|---|
date | Fri, 22 Oct 2010 03:34:25 -0700 |
parents | c18cbe5936b8 |
children | 0a8e0d4345b3 |
rev | line source |
---|---|
0 | 1 /* |
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2 * Copyright (c) 2003, 2006, 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 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 | |
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177 newlib->symtab = build_symtab(newlib->fd, libname); |
0 | 178 if (newlib->symtab == NULL) { |
179 print_debug("symbol table build failed for %s\n", newlib->name); | |
180 } | |
181 | |
182 // even if symbol table building fails, we add the lib_info. | |
183 // This is because we may need to read from the ELF file for core file | |
184 // address read functionality. lookup_symbol checks for NULL symtab. | |
185 if (ph->libs) { | |
186 ph->lib_tail->next = newlib; | |
187 ph->lib_tail = newlib; | |
188 } else { | |
189 ph->libs = ph->lib_tail = newlib; | |
190 } | |
191 ph->num_libs++; | |
192 | |
193 return newlib; | |
194 } | |
195 | |
196 // lookup for a specific symbol | |
197 uintptr_t lookup_symbol(struct ps_prochandle* ph, const char* object_name, | |
198 const char* sym_name) { | |
199 // ignore object_name. search in all libraries | |
200 // FIXME: what should we do with object_name?? The library names are obtained | |
201 // by parsing /proc/<pid>/maps, which may not be the same as object_name. | |
202 // What we need is a utility to map object_name to real file name, something | |
203 // dlopen() does by looking at LD_LIBRARY_PATH and /etc/ld.so.cache. For | |
204 // now, we just ignore object_name and do a global search for the symbol. | |
205 | |
206 lib_info* lib = ph->libs; | |
207 while (lib) { | |
208 if (lib->symtab) { | |
209 uintptr_t res = search_symbol(lib->symtab, lib->base, sym_name, NULL); | |
210 if (res) return res; | |
211 } | |
212 lib = lib->next; | |
213 } | |
214 | |
215 print_debug("lookup failed for symbol '%s' in obj '%s'\n", | |
216 sym_name, object_name); | |
217 return (uintptr_t) NULL; | |
218 } | |
219 | |
220 | |
221 const char* symbol_for_pc(struct ps_prochandle* ph, uintptr_t addr, uintptr_t* poffset) { | |
222 const char* res = NULL; | |
223 lib_info* lib = ph->libs; | |
224 while (lib) { | |
225 if (lib->symtab && addr >= lib->base) { | |
226 res = nearest_symbol(lib->symtab, addr - lib->base, poffset); | |
227 if (res) return res; | |
228 } | |
229 lib = lib->next; | |
230 } | |
231 return NULL; | |
232 } | |
233 | |
234 // add a thread to ps_prochandle | |
235 thread_info* add_thread_info(struct ps_prochandle* ph, pthread_t pthread_id, lwpid_t lwp_id) { | |
236 thread_info* newthr; | |
237 if ( (newthr = (thread_info*) calloc(1, sizeof(thread_info))) == NULL) { | |
238 print_debug("can't allocate memory for thread_info\n"); | |
239 return NULL; | |
240 } | |
241 | |
242 // initialize thread info | |
243 newthr->pthread_id = pthread_id; | |
244 newthr->lwp_id = lwp_id; | |
245 | |
246 // add new thread to the list | |
247 newthr->next = ph->threads; | |
248 ph->threads = newthr; | |
249 ph->num_threads++; | |
250 return newthr; | |
251 } | |
252 | |
253 | |
254 // struct used for client data from thread_db callback | |
255 struct thread_db_client_data { | |
256 struct ps_prochandle* ph; | |
257 thread_info_callback callback; | |
258 }; | |
259 | |
260 // callback function for libthread_db | |
261 static int thread_db_callback(const td_thrhandle_t *th_p, void *data) { | |
262 struct thread_db_client_data* ptr = (struct thread_db_client_data*) data; | |
263 td_thrinfo_t ti; | |
264 td_err_e err; | |
265 | |
266 memset(&ti, 0, sizeof(ti)); | |
267 err = td_thr_get_info(th_p, &ti); | |
268 if (err != TD_OK) { | |
269 print_debug("libthread_db : td_thr_get_info failed, can't get thread info\n"); | |
270 return err; | |
271 } | |
272 | |
273 print_debug("thread_db : pthread %d (lwp %d)\n", ti.ti_tid, ti.ti_lid); | |
274 | |
275 if (ptr->callback(ptr->ph, ti.ti_tid, ti.ti_lid) != true) | |
276 return TD_ERR; | |
277 | |
278 return TD_OK; | |
279 } | |
280 | |
281 // read thread_info using libthread_db | |
282 bool read_thread_info(struct ps_prochandle* ph, thread_info_callback cb) { | |
283 struct thread_db_client_data mydata; | |
284 td_thragent_t* thread_agent = NULL; | |
285 if (td_ta_new(ph, &thread_agent) != TD_OK) { | |
286 print_debug("can't create libthread_db agent\n"); | |
287 return false; | |
288 } | |
289 | |
290 mydata.ph = ph; | |
291 mydata.callback = cb; | |
292 | |
293 // we use libthread_db iterator to iterate thru list of threads. | |
294 if (td_ta_thr_iter(thread_agent, thread_db_callback, &mydata, | |
295 TD_THR_ANY_STATE, TD_THR_LOWEST_PRIORITY, | |
296 TD_SIGNO_MASK, TD_THR_ANY_USER_FLAGS) != TD_OK) { | |
297 td_ta_delete(thread_agent); | |
298 return false; | |
299 } | |
300 | |
301 // delete thread agent | |
302 td_ta_delete(thread_agent); | |
303 return true; | |
304 } | |
305 | |
306 | |
307 // get number of threads | |
308 int get_num_threads(struct ps_prochandle* ph) { | |
309 return ph->num_threads; | |
310 } | |
311 | |
312 // get lwp_id of n'th thread | |
313 lwpid_t get_lwp_id(struct ps_prochandle* ph, int index) { | |
314 int count = 0; | |
315 thread_info* thr = ph->threads; | |
316 while (thr) { | |
317 if (count == index) { | |
318 return thr->lwp_id; | |
319 } | |
320 count++; | |
321 thr = thr->next; | |
322 } | |
323 return -1; | |
324 } | |
325 | |
326 // get regs for a given lwp | |
327 bool get_lwp_regs(struct ps_prochandle* ph, lwpid_t lwp_id, struct user_regs_struct* regs) { | |
328 return ph->ops->get_lwp_regs(ph, lwp_id, regs); | |
329 } | |
330 | |
331 // get number of shared objects | |
332 int get_num_libs(struct ps_prochandle* ph) { | |
333 return ph->num_libs; | |
334 } | |
335 | |
336 // get name of n'th solib | |
337 const char* get_lib_name(struct ps_prochandle* ph, int index) { | |
338 int count = 0; | |
339 lib_info* lib = ph->libs; | |
340 while (lib) { | |
341 if (count == index) { | |
342 return lib->name; | |
343 } | |
344 count++; | |
345 lib = lib->next; | |
346 } | |
347 return NULL; | |
348 } | |
349 | |
350 // get base address of a lib | |
351 uintptr_t get_lib_base(struct ps_prochandle* ph, int index) { | |
352 int count = 0; | |
353 lib_info* lib = ph->libs; | |
354 while (lib) { | |
355 if (count == index) { | |
356 return lib->base; | |
357 } | |
358 count++; | |
359 lib = lib->next; | |
360 } | |
361 return (uintptr_t)NULL; | |
362 } | |
363 | |
364 bool find_lib(struct ps_prochandle* ph, const char *lib_name) { | |
365 lib_info *p = ph->libs; | |
366 while (p) { | |
367 if (strcmp(p->name, lib_name) == 0) { | |
368 return true; | |
369 } | |
370 p = p->next; | |
371 } | |
372 return false; | |
373 } | |
374 | |
375 //-------------------------------------------------------------------------- | |
376 // proc service functions | |
377 | |
378 // get process id | |
379 pid_t ps_getpid(struct ps_prochandle *ph) { | |
380 return ph->pid; | |
381 } | |
382 | |
383 // ps_pglobal_lookup() looks up the symbol sym_name in the symbol table | |
384 // of the load object object_name in the target process identified by ph. | |
385 // It returns the symbol's value as an address in the target process in | |
386 // *sym_addr. | |
387 | |
388 ps_err_e ps_pglobal_lookup(struct ps_prochandle *ph, const char *object_name, | |
389 const char *sym_name, psaddr_t *sym_addr) { | |
390 *sym_addr = (psaddr_t) lookup_symbol(ph, object_name, sym_name); | |
391 return (*sym_addr ? PS_OK : PS_NOSYM); | |
392 } | |
393 | |
394 // read "size" bytes info "buf" from address "addr" | |
395 ps_err_e ps_pdread(struct ps_prochandle *ph, psaddr_t addr, | |
396 void *buf, size_t size) { | |
397 return ph->ops->p_pread(ph, (uintptr_t) addr, buf, size)? PS_OK: PS_ERR; | |
398 } | |
399 | |
400 // write "size" bytes of data to debuggee at address "addr" | |
401 ps_err_e ps_pdwrite(struct ps_prochandle *ph, psaddr_t addr, | |
402 const void *buf, size_t size) { | |
403 return ph->ops->p_pwrite(ph, (uintptr_t)addr, buf, size)? PS_OK: PS_ERR; | |
404 } | |
405 | |
406 // ------------------------------------------------------------------------ | |
407 // Functions below this point are not yet implemented. They are here only | |
408 // to make the linker happy. | |
409 | |
410 ps_err_e ps_lsetfpregs(struct ps_prochandle *ph, lwpid_t lid, const prfpregset_t *fpregs) { | |
411 print_debug("ps_lsetfpregs not implemented\n"); | |
412 return PS_OK; | |
413 } | |
414 | |
415 ps_err_e ps_lsetregs(struct ps_prochandle *ph, lwpid_t lid, const prgregset_t gregset) { | |
416 print_debug("ps_lsetregs not implemented\n"); | |
417 return PS_OK; | |
418 } | |
419 | |
420 ps_err_e ps_lgetfpregs(struct ps_prochandle *ph, lwpid_t lid, prfpregset_t *fpregs) { | |
421 print_debug("ps_lgetfpregs not implemented\n"); | |
422 return PS_OK; | |
423 } | |
424 | |
425 ps_err_e ps_lgetregs(struct ps_prochandle *ph, lwpid_t lid, prgregset_t gregset) { | |
426 print_debug("ps_lgetfpregs not implemented\n"); | |
427 return PS_OK; | |
428 } | |
429 | |
430 // new libthread_db of NPTL seem to require this symbol | |
431 ps_err_e ps_get_thread_area() { | |
432 print_debug("ps_get_thread_area not implemented\n"); | |
433 return PS_OK; | |
434 } |