Wed, 14 Jan 2009 19:45:01 -0800
6786948: SA on core file fails on solaris-amd64 if vm started with -XX:+StartAttachListener
Reviewed-by: jjh, dcubed
duke@435 | 1 | /* |
duke@435 | 2 | * Copyright 2003-2006 Sun Microsystems, Inc. All Rights Reserved. |
duke@435 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
duke@435 | 4 | * |
duke@435 | 5 | * This code is free software; you can redistribute it and/or modify it |
duke@435 | 6 | * under the terms of the GNU General Public License version 2 only, as |
duke@435 | 7 | * published by the Free Software Foundation. |
duke@435 | 8 | * |
duke@435 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
duke@435 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
duke@435 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
duke@435 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
duke@435 | 13 | * accompanied this code). |
duke@435 | 14 | * |
duke@435 | 15 | * You should have received a copy of the GNU General Public License version |
duke@435 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
duke@435 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
duke@435 | 18 | * |
duke@435 | 19 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
duke@435 | 20 | * CA 95054 USA or visit www.sun.com if you need additional information or |
duke@435 | 21 | * have any questions. |
duke@435 | 22 | * |
duke@435 | 23 | */ |
duke@435 | 24 | #include <stdarg.h> |
duke@435 | 25 | #include <stdio.h> |
duke@435 | 26 | #include <stdlib.h> |
duke@435 | 27 | #include <string.h> |
duke@435 | 28 | #include <fcntl.h> |
duke@435 | 29 | #include <thread_db.h> |
duke@435 | 30 | #include "libproc_impl.h" |
duke@435 | 31 | |
duke@435 | 32 | static const char* alt_root = NULL; |
duke@435 | 33 | static int alt_root_len = -1; |
duke@435 | 34 | |
duke@435 | 35 | #define SA_ALTROOT "SA_ALTROOT" |
duke@435 | 36 | |
duke@435 | 37 | static void init_alt_root() { |
duke@435 | 38 | if (alt_root_len == -1) { |
duke@435 | 39 | alt_root = getenv(SA_ALTROOT); |
duke@435 | 40 | if (alt_root) { |
duke@435 | 41 | alt_root_len = strlen(alt_root); |
duke@435 | 42 | } else { |
duke@435 | 43 | alt_root_len = 0; |
duke@435 | 44 | } |
duke@435 | 45 | } |
duke@435 | 46 | } |
duke@435 | 47 | |
duke@435 | 48 | int pathmap_open(const char* name) { |
duke@435 | 49 | int fd; |
duke@435 | 50 | char alt_path[PATH_MAX + 1]; |
duke@435 | 51 | |
duke@435 | 52 | init_alt_root(); |
duke@435 | 53 | fd = open(name, O_RDONLY); |
duke@435 | 54 | if (fd >= 0) { |
duke@435 | 55 | return fd; |
duke@435 | 56 | } |
duke@435 | 57 | |
duke@435 | 58 | if (alt_root_len > 0) { |
duke@435 | 59 | strcpy(alt_path, alt_root); |
duke@435 | 60 | strcat(alt_path, name); |
duke@435 | 61 | fd = open(alt_path, O_RDONLY); |
duke@435 | 62 | if (fd >= 0) { |
duke@435 | 63 | print_debug("path %s substituted for %s\n", alt_path, name); |
duke@435 | 64 | return fd; |
duke@435 | 65 | } |
duke@435 | 66 | |
duke@435 | 67 | if (strrchr(name, '/')) { |
duke@435 | 68 | strcpy(alt_path, alt_root); |
duke@435 | 69 | strcat(alt_path, strrchr(name, '/')); |
duke@435 | 70 | fd = open(alt_path, O_RDONLY); |
duke@435 | 71 | if (fd >= 0) { |
duke@435 | 72 | print_debug("path %s substituted for %s\n", alt_path, name); |
duke@435 | 73 | return fd; |
duke@435 | 74 | } |
duke@435 | 75 | } |
duke@435 | 76 | } |
duke@435 | 77 | |
duke@435 | 78 | return -1; |
duke@435 | 79 | } |
duke@435 | 80 | |
duke@435 | 81 | static bool _libsaproc_debug; |
duke@435 | 82 | |
duke@435 | 83 | void print_debug(const char* format,...) { |
duke@435 | 84 | if (_libsaproc_debug) { |
duke@435 | 85 | va_list alist; |
duke@435 | 86 | |
duke@435 | 87 | va_start(alist, format); |
duke@435 | 88 | fputs("libsaproc DEBUG: ", stderr); |
duke@435 | 89 | vfprintf(stderr, format, alist); |
duke@435 | 90 | va_end(alist); |
duke@435 | 91 | } |
duke@435 | 92 | } |
duke@435 | 93 | |
duke@435 | 94 | bool is_debug() { |
duke@435 | 95 | return _libsaproc_debug; |
duke@435 | 96 | } |
duke@435 | 97 | |
duke@435 | 98 | // initialize libproc |
duke@435 | 99 | bool init_libproc(bool debug) { |
duke@435 | 100 | // init debug mode |
duke@435 | 101 | _libsaproc_debug = debug; |
duke@435 | 102 | |
duke@435 | 103 | // initialize the thread_db library |
duke@435 | 104 | if (td_init() != TD_OK) { |
duke@435 | 105 | print_debug("libthread_db's td_init failed\n"); |
duke@435 | 106 | return false; |
duke@435 | 107 | } |
duke@435 | 108 | |
duke@435 | 109 | return true; |
duke@435 | 110 | } |
duke@435 | 111 | |
duke@435 | 112 | static void destroy_lib_info(struct ps_prochandle* ph) { |
duke@435 | 113 | lib_info* lib = ph->libs; |
duke@435 | 114 | while (lib) { |
duke@435 | 115 | lib_info *next = lib->next; |
duke@435 | 116 | if (lib->symtab) { |
duke@435 | 117 | destroy_symtab(lib->symtab); |
duke@435 | 118 | } |
duke@435 | 119 | free(lib); |
duke@435 | 120 | lib = next; |
duke@435 | 121 | } |
duke@435 | 122 | } |
duke@435 | 123 | |
duke@435 | 124 | static void destroy_thread_info(struct ps_prochandle* ph) { |
duke@435 | 125 | thread_info* thr = ph->threads; |
duke@435 | 126 | while (thr) { |
duke@435 | 127 | thread_info *next = thr->next; |
duke@435 | 128 | free(thr); |
duke@435 | 129 | thr = next; |
duke@435 | 130 | } |
duke@435 | 131 | } |
duke@435 | 132 | |
duke@435 | 133 | // ps_prochandle cleanup |
duke@435 | 134 | |
duke@435 | 135 | // ps_prochandle cleanup |
duke@435 | 136 | void Prelease(struct ps_prochandle* ph) { |
duke@435 | 137 | // do the "derived class" clean-up first |
duke@435 | 138 | ph->ops->release(ph); |
duke@435 | 139 | destroy_lib_info(ph); |
duke@435 | 140 | destroy_thread_info(ph); |
duke@435 | 141 | free(ph); |
duke@435 | 142 | } |
duke@435 | 143 | |
duke@435 | 144 | lib_info* add_lib_info(struct ps_prochandle* ph, const char* libname, uintptr_t base) { |
duke@435 | 145 | return add_lib_info_fd(ph, libname, -1, base); |
duke@435 | 146 | } |
duke@435 | 147 | |
duke@435 | 148 | lib_info* add_lib_info_fd(struct ps_prochandle* ph, const char* libname, int fd, uintptr_t base) { |
duke@435 | 149 | lib_info* newlib; |
duke@435 | 150 | |
duke@435 | 151 | if ( (newlib = (lib_info*) calloc(1, sizeof(struct lib_info))) == NULL) { |
duke@435 | 152 | print_debug("can't allocate memory for lib_info\n"); |
duke@435 | 153 | return NULL; |
duke@435 | 154 | } |
duke@435 | 155 | |
duke@435 | 156 | strncpy(newlib->name, libname, sizeof(newlib->name)); |
duke@435 | 157 | newlib->base = base; |
duke@435 | 158 | |
duke@435 | 159 | if (fd == -1) { |
duke@435 | 160 | if ( (newlib->fd = pathmap_open(newlib->name)) < 0) { |
duke@435 | 161 | print_debug("can't open shared object %s\n", newlib->name); |
duke@435 | 162 | free(newlib); |
duke@435 | 163 | return NULL; |
duke@435 | 164 | } |
duke@435 | 165 | } else { |
duke@435 | 166 | newlib->fd = fd; |
duke@435 | 167 | } |
duke@435 | 168 | |
duke@435 | 169 | // check whether we have got an ELF file. /proc/<pid>/map |
duke@435 | 170 | // gives out all file mappings and not just shared objects |
duke@435 | 171 | if (is_elf_file(newlib->fd) == false) { |
duke@435 | 172 | close(newlib->fd); |
duke@435 | 173 | free(newlib); |
duke@435 | 174 | return NULL; |
duke@435 | 175 | } |
duke@435 | 176 | |
duke@435 | 177 | newlib->symtab = build_symtab(newlib->fd); |
duke@435 | 178 | if (newlib->symtab == NULL) { |
duke@435 | 179 | print_debug("symbol table build failed for %s\n", newlib->name); |
duke@435 | 180 | } |
duke@435 | 181 | |
duke@435 | 182 | // even if symbol table building fails, we add the lib_info. |
duke@435 | 183 | // This is because we may need to read from the ELF file for core file |
duke@435 | 184 | // address read functionality. lookup_symbol checks for NULL symtab. |
duke@435 | 185 | if (ph->libs) { |
duke@435 | 186 | ph->lib_tail->next = newlib; |
duke@435 | 187 | ph->lib_tail = newlib; |
duke@435 | 188 | } else { |
duke@435 | 189 | ph->libs = ph->lib_tail = newlib; |
duke@435 | 190 | } |
duke@435 | 191 | ph->num_libs++; |
duke@435 | 192 | |
duke@435 | 193 | return newlib; |
duke@435 | 194 | } |
duke@435 | 195 | |
duke@435 | 196 | // lookup for a specific symbol |
duke@435 | 197 | uintptr_t lookup_symbol(struct ps_prochandle* ph, const char* object_name, |
duke@435 | 198 | const char* sym_name) { |
duke@435 | 199 | // ignore object_name. search in all libraries |
duke@435 | 200 | // FIXME: what should we do with object_name?? The library names are obtained |
duke@435 | 201 | // by parsing /proc/<pid>/maps, which may not be the same as object_name. |
duke@435 | 202 | // What we need is a utility to map object_name to real file name, something |
duke@435 | 203 | // dlopen() does by looking at LD_LIBRARY_PATH and /etc/ld.so.cache. For |
duke@435 | 204 | // now, we just ignore object_name and do a global search for the symbol. |
duke@435 | 205 | |
duke@435 | 206 | lib_info* lib = ph->libs; |
duke@435 | 207 | while (lib) { |
duke@435 | 208 | if (lib->symtab) { |
duke@435 | 209 | uintptr_t res = search_symbol(lib->symtab, lib->base, sym_name, NULL); |
duke@435 | 210 | if (res) return res; |
duke@435 | 211 | } |
duke@435 | 212 | lib = lib->next; |
duke@435 | 213 | } |
duke@435 | 214 | |
duke@435 | 215 | print_debug("lookup failed for symbol '%s' in obj '%s'\n", |
duke@435 | 216 | sym_name, object_name); |
duke@435 | 217 | return (uintptr_t) NULL; |
duke@435 | 218 | } |
duke@435 | 219 | |
duke@435 | 220 | |
duke@435 | 221 | const char* symbol_for_pc(struct ps_prochandle* ph, uintptr_t addr, uintptr_t* poffset) { |
duke@435 | 222 | const char* res = NULL; |
duke@435 | 223 | lib_info* lib = ph->libs; |
duke@435 | 224 | while (lib) { |
duke@435 | 225 | if (lib->symtab && addr >= lib->base) { |
duke@435 | 226 | res = nearest_symbol(lib->symtab, addr - lib->base, poffset); |
duke@435 | 227 | if (res) return res; |
duke@435 | 228 | } |
duke@435 | 229 | lib = lib->next; |
duke@435 | 230 | } |
duke@435 | 231 | return NULL; |
duke@435 | 232 | } |
duke@435 | 233 | |
duke@435 | 234 | // add a thread to ps_prochandle |
duke@435 | 235 | thread_info* add_thread_info(struct ps_prochandle* ph, pthread_t pthread_id, lwpid_t lwp_id) { |
duke@435 | 236 | thread_info* newthr; |
duke@435 | 237 | if ( (newthr = (thread_info*) calloc(1, sizeof(thread_info))) == NULL) { |
duke@435 | 238 | print_debug("can't allocate memory for thread_info\n"); |
duke@435 | 239 | return NULL; |
duke@435 | 240 | } |
duke@435 | 241 | |
duke@435 | 242 | // initialize thread info |
duke@435 | 243 | newthr->pthread_id = pthread_id; |
duke@435 | 244 | newthr->lwp_id = lwp_id; |
duke@435 | 245 | |
duke@435 | 246 | // add new thread to the list |
duke@435 | 247 | newthr->next = ph->threads; |
duke@435 | 248 | ph->threads = newthr; |
duke@435 | 249 | ph->num_threads++; |
duke@435 | 250 | return newthr; |
duke@435 | 251 | } |
duke@435 | 252 | |
duke@435 | 253 | |
duke@435 | 254 | // struct used for client data from thread_db callback |
duke@435 | 255 | struct thread_db_client_data { |
duke@435 | 256 | struct ps_prochandle* ph; |
duke@435 | 257 | thread_info_callback callback; |
duke@435 | 258 | }; |
duke@435 | 259 | |
duke@435 | 260 | // callback function for libthread_db |
duke@435 | 261 | static int thread_db_callback(const td_thrhandle_t *th_p, void *data) { |
duke@435 | 262 | struct thread_db_client_data* ptr = (struct thread_db_client_data*) data; |
duke@435 | 263 | td_thrinfo_t ti; |
duke@435 | 264 | td_err_e err; |
duke@435 | 265 | |
duke@435 | 266 | memset(&ti, 0, sizeof(ti)); |
duke@435 | 267 | err = td_thr_get_info(th_p, &ti); |
duke@435 | 268 | if (err != TD_OK) { |
duke@435 | 269 | print_debug("libthread_db : td_thr_get_info failed, can't get thread info\n"); |
duke@435 | 270 | return err; |
duke@435 | 271 | } |
duke@435 | 272 | |
duke@435 | 273 | print_debug("thread_db : pthread %d (lwp %d)\n", ti.ti_tid, ti.ti_lid); |
duke@435 | 274 | |
duke@435 | 275 | if (ptr->callback(ptr->ph, ti.ti_tid, ti.ti_lid) != true) |
duke@435 | 276 | return TD_ERR; |
duke@435 | 277 | |
duke@435 | 278 | return TD_OK; |
duke@435 | 279 | } |
duke@435 | 280 | |
duke@435 | 281 | // read thread_info using libthread_db |
duke@435 | 282 | bool read_thread_info(struct ps_prochandle* ph, thread_info_callback cb) { |
duke@435 | 283 | struct thread_db_client_data mydata; |
duke@435 | 284 | td_thragent_t* thread_agent = NULL; |
duke@435 | 285 | if (td_ta_new(ph, &thread_agent) != TD_OK) { |
duke@435 | 286 | print_debug("can't create libthread_db agent\n"); |
duke@435 | 287 | return false; |
duke@435 | 288 | } |
duke@435 | 289 | |
duke@435 | 290 | mydata.ph = ph; |
duke@435 | 291 | mydata.callback = cb; |
duke@435 | 292 | |
duke@435 | 293 | // we use libthread_db iterator to iterate thru list of threads. |
duke@435 | 294 | if (td_ta_thr_iter(thread_agent, thread_db_callback, &mydata, |
duke@435 | 295 | TD_THR_ANY_STATE, TD_THR_LOWEST_PRIORITY, |
duke@435 | 296 | TD_SIGNO_MASK, TD_THR_ANY_USER_FLAGS) != TD_OK) { |
duke@435 | 297 | td_ta_delete(thread_agent); |
duke@435 | 298 | return false; |
duke@435 | 299 | } |
duke@435 | 300 | |
duke@435 | 301 | // delete thread agent |
duke@435 | 302 | td_ta_delete(thread_agent); |
duke@435 | 303 | return true; |
duke@435 | 304 | } |
duke@435 | 305 | |
duke@435 | 306 | |
duke@435 | 307 | // get number of threads |
duke@435 | 308 | int get_num_threads(struct ps_prochandle* ph) { |
duke@435 | 309 | return ph->num_threads; |
duke@435 | 310 | } |
duke@435 | 311 | |
duke@435 | 312 | // get lwp_id of n'th thread |
duke@435 | 313 | lwpid_t get_lwp_id(struct ps_prochandle* ph, int index) { |
duke@435 | 314 | int count = 0; |
duke@435 | 315 | thread_info* thr = ph->threads; |
duke@435 | 316 | while (thr) { |
duke@435 | 317 | if (count == index) { |
duke@435 | 318 | return thr->lwp_id; |
duke@435 | 319 | } |
duke@435 | 320 | count++; |
duke@435 | 321 | thr = thr->next; |
duke@435 | 322 | } |
duke@435 | 323 | return -1; |
duke@435 | 324 | } |
duke@435 | 325 | |
duke@435 | 326 | // get regs for a given lwp |
duke@435 | 327 | bool get_lwp_regs(struct ps_prochandle* ph, lwpid_t lwp_id, struct user_regs_struct* regs) { |
duke@435 | 328 | return ph->ops->get_lwp_regs(ph, lwp_id, regs); |
duke@435 | 329 | } |
duke@435 | 330 | |
duke@435 | 331 | // get number of shared objects |
duke@435 | 332 | int get_num_libs(struct ps_prochandle* ph) { |
duke@435 | 333 | return ph->num_libs; |
duke@435 | 334 | } |
duke@435 | 335 | |
duke@435 | 336 | // get name of n'th solib |
duke@435 | 337 | const char* get_lib_name(struct ps_prochandle* ph, int index) { |
duke@435 | 338 | int count = 0; |
duke@435 | 339 | lib_info* lib = ph->libs; |
duke@435 | 340 | while (lib) { |
duke@435 | 341 | if (count == index) { |
duke@435 | 342 | return lib->name; |
duke@435 | 343 | } |
duke@435 | 344 | count++; |
duke@435 | 345 | lib = lib->next; |
duke@435 | 346 | } |
duke@435 | 347 | return NULL; |
duke@435 | 348 | } |
duke@435 | 349 | |
duke@435 | 350 | // get base address of a lib |
duke@435 | 351 | uintptr_t get_lib_base(struct ps_prochandle* ph, int index) { |
duke@435 | 352 | int count = 0; |
duke@435 | 353 | lib_info* lib = ph->libs; |
duke@435 | 354 | while (lib) { |
duke@435 | 355 | if (count == index) { |
duke@435 | 356 | return lib->base; |
duke@435 | 357 | } |
duke@435 | 358 | count++; |
duke@435 | 359 | lib = lib->next; |
duke@435 | 360 | } |
duke@435 | 361 | return (uintptr_t)NULL; |
duke@435 | 362 | } |
duke@435 | 363 | |
duke@435 | 364 | bool find_lib(struct ps_prochandle* ph, const char *lib_name) { |
duke@435 | 365 | lib_info *p = ph->libs; |
duke@435 | 366 | while (p) { |
duke@435 | 367 | if (strcmp(p->name, lib_name) == 0) { |
duke@435 | 368 | return true; |
duke@435 | 369 | } |
duke@435 | 370 | p = p->next; |
duke@435 | 371 | } |
duke@435 | 372 | return false; |
duke@435 | 373 | } |
duke@435 | 374 | |
duke@435 | 375 | //-------------------------------------------------------------------------- |
duke@435 | 376 | // proc service functions |
duke@435 | 377 | |
duke@435 | 378 | // get process id |
duke@435 | 379 | pid_t ps_getpid(struct ps_prochandle *ph) { |
duke@435 | 380 | return ph->pid; |
duke@435 | 381 | } |
duke@435 | 382 | |
duke@435 | 383 | // ps_pglobal_lookup() looks up the symbol sym_name in the symbol table |
duke@435 | 384 | // of the load object object_name in the target process identified by ph. |
duke@435 | 385 | // It returns the symbol's value as an address in the target process in |
duke@435 | 386 | // *sym_addr. |
duke@435 | 387 | |
duke@435 | 388 | ps_err_e ps_pglobal_lookup(struct ps_prochandle *ph, const char *object_name, |
duke@435 | 389 | const char *sym_name, psaddr_t *sym_addr) { |
duke@435 | 390 | *sym_addr = (psaddr_t) lookup_symbol(ph, object_name, sym_name); |
duke@435 | 391 | return (*sym_addr ? PS_OK : PS_NOSYM); |
duke@435 | 392 | } |
duke@435 | 393 | |
duke@435 | 394 | // read "size" bytes info "buf" from address "addr" |
duke@435 | 395 | ps_err_e ps_pdread(struct ps_prochandle *ph, psaddr_t addr, |
duke@435 | 396 | void *buf, size_t size) { |
duke@435 | 397 | return ph->ops->p_pread(ph, (uintptr_t) addr, buf, size)? PS_OK: PS_ERR; |
duke@435 | 398 | } |
duke@435 | 399 | |
duke@435 | 400 | // write "size" bytes of data to debuggee at address "addr" |
duke@435 | 401 | ps_err_e ps_pdwrite(struct ps_prochandle *ph, psaddr_t addr, |
duke@435 | 402 | const void *buf, size_t size) { |
duke@435 | 403 | return ph->ops->p_pwrite(ph, (uintptr_t)addr, buf, size)? PS_OK: PS_ERR; |
duke@435 | 404 | } |
duke@435 | 405 | |
duke@435 | 406 | // ------------------------------------------------------------------------ |
duke@435 | 407 | // Functions below this point are not yet implemented. They are here only |
duke@435 | 408 | // to make the linker happy. |
duke@435 | 409 | |
duke@435 | 410 | ps_err_e ps_lsetfpregs(struct ps_prochandle *ph, lwpid_t lid, const prfpregset_t *fpregs) { |
duke@435 | 411 | print_debug("ps_lsetfpregs not implemented\n"); |
duke@435 | 412 | return PS_OK; |
duke@435 | 413 | } |
duke@435 | 414 | |
duke@435 | 415 | ps_err_e ps_lsetregs(struct ps_prochandle *ph, lwpid_t lid, const prgregset_t gregset) { |
duke@435 | 416 | print_debug("ps_lsetregs not implemented\n"); |
duke@435 | 417 | return PS_OK; |
duke@435 | 418 | } |
duke@435 | 419 | |
duke@435 | 420 | ps_err_e ps_lgetfpregs(struct ps_prochandle *ph, lwpid_t lid, prfpregset_t *fpregs) { |
duke@435 | 421 | print_debug("ps_lgetfpregs not implemented\n"); |
duke@435 | 422 | return PS_OK; |
duke@435 | 423 | } |
duke@435 | 424 | |
duke@435 | 425 | ps_err_e ps_lgetregs(struct ps_prochandle *ph, lwpid_t lid, prgregset_t gregset) { |
duke@435 | 426 | print_debug("ps_lgetfpregs not implemented\n"); |
duke@435 | 427 | return PS_OK; |
duke@435 | 428 | } |
duke@435 | 429 | |
duke@435 | 430 | // new libthread_db of NPTL seem to require this symbol |
duke@435 | 431 | ps_err_e ps_get_thread_area() { |
duke@435 | 432 | print_debug("ps_get_thread_area not implemented\n"); |
duke@435 | 433 | return PS_OK; |
duke@435 | 434 | } |