Mercurial > hg > truffle
annotate agent/src/os/linux/libproc_impl.c @ 4919:54d3535a6dd3
7009098: SA cannot open core files larger than 2GB on Linux 32-bit
Summary: Added Large File Support by compiling libsaproc.so with -D_FILE_OFFSET_BITS=64, and a small change with which SA should first load libraries from the path specified with SA_ALTROOT.
Reviewed-by: dholmes, kevinw, dcubed, minqi
| author | poonam |
|---|---|
| date | Sun, 12 Feb 2012 19:33:11 -0800 |
| parents | 0a8e0d4345b3 |
| children | 2394a89e89f4 |
| rev | line source |
|---|---|
| 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 } |