Wed, 27 Apr 2016 01:25:04 +0800
Initial load
http://hg.openjdk.java.net/jdk8u/jdk8u/hotspot/
changeset: 6782:28b50d07f6f8
tag: jdk8u25-b17
1 /*
2 * Copyright (c) 2003, 2013, 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 "libproc_impl.h"
26 static const char* alt_root = NULL;
27 static int alt_root_len = -1;
29 #define SA_ALTROOT "SA_ALTROOT"
31 off_t ltell(int fd) {
32 return lseek(fd, 0, SEEK_CUR);
33 }
35 static void init_alt_root() {
36 if (alt_root_len == -1) {
37 alt_root = getenv(SA_ALTROOT);
38 if (alt_root) {
39 alt_root_len = strlen(alt_root);
40 } else {
41 alt_root_len = 0;
42 }
43 }
44 }
46 int pathmap_open(const char* name) {
47 int fd;
48 char alt_path[PATH_MAX + 1];
50 init_alt_root();
52 if (alt_root_len > 0) {
53 strcpy(alt_path, alt_root);
54 strcat(alt_path, name);
55 fd = open(alt_path, O_RDONLY);
56 if (fd >= 0) {
57 print_debug("path %s substituted for %s\n", alt_path, name);
58 return fd;
59 }
61 if (strrchr(name, '/')) {
62 strcpy(alt_path, alt_root);
63 strcat(alt_path, strrchr(name, '/'));
64 fd = open(alt_path, O_RDONLY);
65 if (fd >= 0) {
66 print_debug("path %s substituted for %s\n", alt_path, name);
67 return fd;
68 }
69 }
70 } else {
71 fd = open(name, O_RDONLY);
72 if (fd >= 0) {
73 return fd;
74 }
75 }
76 return -1;
77 }
79 static bool _libsaproc_debug;
81 void print_debug(const char* format,...) {
82 if (_libsaproc_debug) {
83 va_list alist;
85 va_start(alist, format);
86 fputs("libsaproc DEBUG: ", stderr);
87 vfprintf(stderr, format, alist);
88 va_end(alist);
89 }
90 }
92 void print_error(const char* format,...) {
93 va_list alist;
94 va_start(alist, format);
95 fputs("ERROR: ", stderr);
96 vfprintf(stderr, format, alist);
97 va_end(alist);
98 }
100 bool is_debug() {
101 return _libsaproc_debug;
102 }
104 #ifdef __APPLE__
105 // get arch offset in file
106 bool get_arch_off(int fd, cpu_type_t cputype, off_t *offset) {
107 struct fat_header fatheader;
108 struct fat_arch fatarch;
109 off_t img_start = 0;
111 off_t pos = ltell(fd);
112 if (read(fd, (void *)&fatheader, sizeof(struct fat_header)) != sizeof(struct fat_header)) {
113 return false;
114 }
115 if (fatheader.magic == FAT_CIGAM) {
116 int i;
117 for (i = 0; i < ntohl(fatheader.nfat_arch); i++) {
118 if (read(fd, (void *)&fatarch, sizeof(struct fat_arch)) != sizeof(struct fat_arch)) {
119 return false;
120 }
121 if (ntohl(fatarch.cputype) == cputype) {
122 print_debug("fat offset=%x\n", ntohl(fatarch.offset));
123 img_start = ntohl(fatarch.offset);
124 break;
125 }
126 }
127 if (img_start == 0) {
128 return false;
129 }
130 }
131 lseek(fd, pos, SEEK_SET);
132 *offset = img_start;
133 return true;
134 }
136 bool is_macho_file(int fd) {
137 mach_header_64 fhdr;
138 off_t x86_64_off;
140 if (fd < 0) {
141 print_debug("Invalid file handle passed to is_macho_file\n");
142 return false;
143 }
145 off_t pos = ltell(fd);
146 // check fat header
147 if (!get_arch_off(fd, CPU_TYPE_X86_64, &x86_64_off)) {
148 print_debug("failed to get fat header\n");
149 return false;
150 }
151 lseek(fd, x86_64_off, SEEK_SET);
152 if (read(fd, (void *)&fhdr, sizeof(mach_header_64)) != sizeof(mach_header_64)) {
153 return false;
154 }
155 lseek(fd, pos, SEEK_SET); // restore
156 print_debug("fhdr.magic %x\n", fhdr.magic);
157 return (fhdr.magic == MH_MAGIC_64 || fhdr.magic == MH_CIGAM_64);
158 }
160 #endif //__APPLE__
162 // initialize libproc
163 bool init_libproc(bool debug) {
164 _libsaproc_debug = debug;
165 #ifndef __APPLE__
166 // initialize the thread_db library
167 if (td_init() != TD_OK) {
168 print_debug("libthread_db's td_init failed\n");
169 return false;
170 }
171 #endif // __APPLE__
172 return true;
173 }
175 void destroy_lib_info(struct ps_prochandle* ph) {
176 lib_info* lib = ph->libs;
177 while (lib) {
178 lib_info* next = lib->next;
179 if (lib->symtab) {
180 destroy_symtab(lib->symtab);
181 }
182 free(lib);
183 lib = next;
184 }
185 }
187 void destroy_thread_info(struct ps_prochandle* ph) {
188 sa_thread_info* thr = ph->threads;
189 while (thr) {
190 sa_thread_info* n = thr->next;
191 free(thr);
192 thr = n;
193 }
194 }
196 // ps_prochandle cleanup
197 void Prelease(struct ps_prochandle* ph) {
198 // do the "derived class" clean-up first
199 ph->ops->release(ph);
200 destroy_lib_info(ph);
201 destroy_thread_info(ph);
202 free(ph);
203 }
205 lib_info* add_lib_info(struct ps_prochandle* ph, const char* libname, uintptr_t base) {
206 return add_lib_info_fd(ph, libname, -1, base);
207 }
209 lib_info* add_lib_info_fd(struct ps_prochandle* ph, const char* libname, int fd, uintptr_t base) {
210 lib_info* newlib;
211 print_debug("add_lib_info_fd %s\n", libname);
213 if ( (newlib = (lib_info*) calloc(1, sizeof(struct lib_info))) == NULL) {
214 print_debug("can't allocate memory for lib_info\n");
215 return NULL;
216 }
218 strncpy(newlib->name, libname, sizeof(newlib->name));
219 newlib->base = base;
221 if (fd == -1) {
222 if ( (newlib->fd = pathmap_open(newlib->name)) < 0) {
223 print_debug("can't open shared object %s\n", newlib->name);
224 free(newlib);
225 return NULL;
226 }
227 } else {
228 newlib->fd = fd;
229 }
231 #ifdef __APPLE__
232 // check whether we have got an Macho file.
233 if (is_macho_file(newlib->fd) == false) {
234 close(newlib->fd);
235 free(newlib);
236 print_debug("not a mach-o file\n");
237 return NULL;
238 }
239 #else
240 // check whether we have got an ELF file. /proc/<pid>/map
241 // gives out all file mappings and not just shared objects
242 if (is_elf_file(newlib->fd) == false) {
243 close(newlib->fd);
244 free(newlib);
245 return NULL;
246 }
247 #endif // __APPLE__
249 newlib->symtab = build_symtab(newlib->fd);
250 if (newlib->symtab == NULL) {
251 print_debug("symbol table build failed for %s\n", newlib->name);
252 } else {
253 print_debug("built symbol table for %s\n", newlib->name);
254 }
256 // even if symbol table building fails, we add the lib_info.
257 // This is because we may need to read from the ELF file or MachO file for core file
258 // address read functionality. lookup_symbol checks for NULL symtab.
259 if (ph->libs) {
260 ph->lib_tail->next = newlib;
261 ph->lib_tail = newlib;
262 } else {
263 ph->libs = ph->lib_tail = newlib;
264 }
265 ph->num_libs++;
266 return newlib;
267 }
269 // lookup for a specific symbol
270 uintptr_t lookup_symbol(struct ps_prochandle* ph, const char* object_name,
271 const char* sym_name) {
272 // ignore object_name. search in all libraries
273 // FIXME: what should we do with object_name?? The library names are obtained
274 // by parsing /proc/<pid>/maps, which may not be the same as object_name.
275 // What we need is a utility to map object_name to real file name, something
276 // dlopen() does by looking at LD_LIBRARY_PATH and /etc/ld.so.cache. For
277 // now, we just ignore object_name and do a global search for the symbol.
279 lib_info* lib = ph->libs;
280 while (lib) {
281 if (lib->symtab) {
282 uintptr_t res = search_symbol(lib->symtab, lib->base, sym_name, NULL);
283 if (res) return res;
284 }
285 lib = lib->next;
286 }
288 print_debug("lookup failed for symbol '%s' in obj '%s'\n",
289 sym_name, object_name);
290 return (uintptr_t) NULL;
291 }
293 const char* symbol_for_pc(struct ps_prochandle* ph, uintptr_t addr, uintptr_t* poffset) {
294 const char* res = NULL;
295 lib_info* lib = ph->libs;
296 while (lib) {
297 if (lib->symtab && addr >= lib->base) {
298 res = nearest_symbol(lib->symtab, addr - lib->base, poffset);
299 if (res) return res;
300 }
301 lib = lib->next;
302 }
303 return NULL;
304 }
306 // add a thread to ps_prochandle
307 sa_thread_info* add_thread_info(struct ps_prochandle* ph, pthread_t pthread_id, lwpid_t lwp_id) {
308 sa_thread_info* newthr;
309 if ( (newthr = (sa_thread_info*) calloc(1, sizeof(sa_thread_info))) == NULL) {
310 print_debug("can't allocate memory for thread_info\n");
311 return NULL;
312 }
314 // initialize thread info
315 newthr->pthread_id = pthread_id;
316 newthr->lwp_id = lwp_id;
318 // add new thread to the list
319 newthr->next = ph->threads;
320 ph->threads = newthr;
321 ph->num_threads++;
322 return newthr;
323 }
325 #ifndef __APPLE__
326 // struct used for client data from thread_db callback
327 struct thread_db_client_data {
328 struct ps_prochandle* ph;
329 thread_info_callback callback;
330 };
332 // callback function for libthread_db
333 static int thread_db_callback(const td_thrhandle_t *th_p, void *data) {
334 struct thread_db_client_data* ptr = (struct thread_db_client_data*) data;
335 td_thrinfo_t ti;
336 td_err_e err;
338 memset(&ti, 0, sizeof(ti));
339 err = td_thr_get_info(th_p, &ti);
340 if (err != TD_OK) {
341 print_debug("libthread_db : td_thr_get_info failed, can't get thread info\n");
342 return err;
343 }
345 print_debug("thread_db : pthread %d (lwp %d)\n", ti.ti_tid, ti.ti_lid);
347 if (ptr->callback(ptr->ph, (pthread_t)ti.ti_tid, ti.ti_lid) != true)
348 return TD_ERR;
350 return TD_OK;
351 }
353 // read thread_info using libthread_db
354 bool read_thread_info(struct ps_prochandle* ph, thread_info_callback cb) {
355 struct thread_db_client_data mydata;
356 td_thragent_t* thread_agent = NULL;
357 if (td_ta_new(ph, &thread_agent) != TD_OK) {
358 print_debug("can't create libthread_db agent\n");
359 return false;
360 }
362 mydata.ph = ph;
363 mydata.callback = cb;
365 // we use libthread_db iterator to iterate thru list of threads.
366 if (td_ta_thr_iter(thread_agent, thread_db_callback, &mydata,
367 TD_THR_ANY_STATE, TD_THR_LOWEST_PRIORITY,
368 TD_SIGNO_MASK, TD_THR_ANY_USER_FLAGS) != TD_OK) {
369 td_ta_delete(thread_agent);
370 return false;
371 }
373 // delete thread agent
374 td_ta_delete(thread_agent);
375 return true;
376 }
378 #endif // __APPLE__
380 // get number of threads
381 int get_num_threads(struct ps_prochandle* ph) {
382 return ph->num_threads;
383 }
385 // get lwp_id of n'th thread
386 lwpid_t get_lwp_id(struct ps_prochandle* ph, int index) {
387 int count = 0;
388 sa_thread_info* thr = ph->threads;
389 while (thr) {
390 if (count == index) {
391 return thr->lwp_id;
392 }
393 count++;
394 thr = thr->next;
395 }
396 return 0;
397 }
399 #ifdef __APPLE__
400 // set lwp_id of n'th thread
401 bool set_lwp_id(struct ps_prochandle* ph, int index, lwpid_t lwpid) {
402 int count = 0;
403 sa_thread_info* thr = ph->threads;
404 while (thr) {
405 if (count == index) {
406 thr->lwp_id = lwpid;
407 return true;
408 }
409 count++;
410 thr = thr->next;
411 }
412 return false;
413 }
415 // get regs of n-th thread, only used in fillThreads the first time called
416 bool get_nth_lwp_regs(struct ps_prochandle* ph, int index, struct reg* regs) {
417 int count = 0;
418 sa_thread_info* thr = ph->threads;
419 while (thr) {
420 if (count == index) {
421 break;
422 }
423 count++;
424 thr = thr->next;
425 }
426 if (thr != NULL) {
427 memcpy(regs, &thr->regs, sizeof(struct reg));
428 return true;
429 }
430 return false;
431 }
433 #endif // __APPLE__
435 // get regs for a given lwp
436 bool get_lwp_regs(struct ps_prochandle* ph, lwpid_t lwp_id, struct reg* regs) {
437 return ph->ops->get_lwp_regs(ph, lwp_id, regs);
438 }
440 // get number of shared objects
441 int get_num_libs(struct ps_prochandle* ph) {
442 return ph->num_libs;
443 }
445 // get name of n'th solib
446 const char* get_lib_name(struct ps_prochandle* ph, int index) {
447 int count = 0;
448 lib_info* lib = ph->libs;
449 while (lib) {
450 if (count == index) {
451 return lib->name;
452 }
453 count++;
454 lib = lib->next;
455 }
456 return NULL;
457 }
459 // get base address of a lib
460 uintptr_t get_lib_base(struct ps_prochandle* ph, int index) {
461 int count = 0;
462 lib_info* lib = ph->libs;
463 while (lib) {
464 if (count == index) {
465 return lib->base;
466 }
467 count++;
468 lib = lib->next;
469 }
470 return (uintptr_t)NULL;
471 }
473 bool find_lib(struct ps_prochandle* ph, const char *lib_name) {
474 lib_info *p = ph->libs;
475 while (p) {
476 if (strcmp(p->name, lib_name) == 0) {
477 return true;
478 }
479 p = p->next;
480 }
481 return false;
482 }
484 //--------------------------------------------------------------------------
485 // proc service functions
487 // ps_pglobal_lookup() looks up the symbol sym_name in the symbol table
488 // of the load object object_name in the target process identified by ph.
489 // It returns the symbol's value as an address in the target process in
490 // *sym_addr.
492 ps_err_e ps_pglobal_lookup(struct ps_prochandle *ph, const char *object_name,
493 const char *sym_name, psaddr_t *sym_addr) {
494 *sym_addr = (psaddr_t) lookup_symbol(ph, object_name, sym_name);
495 return (*sym_addr ? PS_OK : PS_NOSYM);
496 }
498 // read "size" bytes info "buf" from address "addr"
499 ps_err_e ps_pread(struct ps_prochandle *ph, psaddr_t addr,
500 void *buf, size_t size) {
501 return ph->ops->p_pread(ph, (uintptr_t) addr, buf, size)? PS_OK: PS_ERR;
502 }
504 // write "size" bytes of data to debuggee at address "addr"
505 ps_err_e ps_pwrite(struct ps_prochandle *ph, psaddr_t addr,
506 const void *buf, size_t size) {
507 return ph->ops->p_pwrite(ph, (uintptr_t)addr, buf, size)? PS_OK: PS_ERR;
508 }
510 // fill in ptrace_lwpinfo for lid
511 ps_err_e ps_linfo(struct ps_prochandle *ph, lwpid_t lwp_id, void *linfo) {
512 return ph->ops->get_lwp_info(ph, lwp_id, linfo)? PS_OK: PS_ERR;
513 }
515 // needed for when libthread_db is compiled with TD_DEBUG defined
516 void
517 ps_plog (const char *format, ...)
518 {
519 va_list alist;
521 va_start(alist, format);
522 vfprintf(stderr, format, alist);
523 va_end(alist);
524 }
526 #ifndef __APPLE__
527 // ------------------------------------------------------------------------
528 // Functions below this point are not yet implemented. They are here only
529 // to make the linker happy.
531 ps_err_e ps_lsetfpregs(struct ps_prochandle *ph, lwpid_t lid, const prfpregset_t *fpregs) {
532 print_debug("ps_lsetfpregs not implemented\n");
533 return PS_OK;
534 }
536 ps_err_e ps_lsetregs(struct ps_prochandle *ph, lwpid_t lid, const prgregset_t gregset) {
537 print_debug("ps_lsetregs not implemented\n");
538 return PS_OK;
539 }
541 ps_err_e ps_lgetfpregs(struct ps_prochandle *ph, lwpid_t lid, prfpregset_t *fpregs) {
542 print_debug("ps_lgetfpregs not implemented\n");
543 return PS_OK;
544 }
546 ps_err_e ps_lgetregs(struct ps_prochandle *ph, lwpid_t lid, prgregset_t gregset) {
547 print_debug("ps_lgetfpregs not implemented\n");
548 return PS_OK;
549 }
551 ps_err_e ps_lstop(struct ps_prochandle *ph, lwpid_t lid) {
552 print_debug("ps_lstop not implemented\n");
553 return PS_OK;
554 }
556 ps_err_e ps_pcontinue(struct ps_prochandle *ph) {
557 print_debug("ps_pcontinue not implemented\n");
558 return PS_OK;
559 }
560 #endif // __APPLE__