Mon, 28 Jul 2014 15:06:38 -0700
8051344: JVM crashed in Compile::start() during method parsing w/ UseRTMDeopt turned on
Summary: call rtm_deopt() only if there were no compilation bailouts before.
Reviewed-by: kvn
duke@435 | 1 | /* |
dsamersoff@5758 | 2 | * Copyright (c) 2003, 2013, Oracle and/or its affiliates. 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 | * |
trims@1907 | 19 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
trims@1907 | 20 | * or visit www.oracle.com if you need additional information or have any |
trims@1907 | 21 | * questions. |
duke@435 | 22 | * |
duke@435 | 23 | */ |
duke@435 | 24 | |
duke@435 | 25 | #include <jni.h> |
duke@435 | 26 | #include <unistd.h> |
duke@435 | 27 | #include <fcntl.h> |
duke@435 | 28 | #include <string.h> |
duke@435 | 29 | #include <stdlib.h> |
duke@435 | 30 | #include <stddef.h> |
duke@435 | 31 | #include <elf.h> |
duke@435 | 32 | #include <link.h> |
duke@435 | 33 | #include "libproc_impl.h" |
duke@435 | 34 | #include "salibelf.h" |
duke@435 | 35 | |
duke@435 | 36 | // This file has the libproc implementation to read core files. |
duke@435 | 37 | // For live processes, refer to ps_proc.c. Portions of this is adapted |
duke@435 | 38 | // /modelled after Solaris libproc.so (in particular Pcore.c) |
duke@435 | 39 | |
duke@435 | 40 | //---------------------------------------------------------------------- |
duke@435 | 41 | // ps_prochandle cleanup helper functions |
duke@435 | 42 | |
duke@435 | 43 | // close all file descriptors |
dsamersoff@5832 | 44 | static void close_files(struct ps_prochandle* ph) { |
dsamersoff@5832 | 45 | lib_info* lib = NULL; |
duke@435 | 46 | |
dsamersoff@5832 | 47 | // close core file descriptor |
dsamersoff@5832 | 48 | if (ph->core->core_fd >= 0) |
dsamersoff@5832 | 49 | close(ph->core->core_fd); |
duke@435 | 50 | |
dsamersoff@5832 | 51 | // close exec file descriptor |
dsamersoff@5832 | 52 | if (ph->core->exec_fd >= 0) |
dsamersoff@5832 | 53 | close(ph->core->exec_fd); |
duke@435 | 54 | |
dsamersoff@5832 | 55 | // close interp file descriptor |
dsamersoff@5832 | 56 | if (ph->core->interp_fd >= 0) |
dsamersoff@5832 | 57 | close(ph->core->interp_fd); |
duke@435 | 58 | |
dsamersoff@5832 | 59 | // close class share archive file |
dsamersoff@5832 | 60 | if (ph->core->classes_jsa_fd >= 0) |
dsamersoff@5832 | 61 | close(ph->core->classes_jsa_fd); |
duke@435 | 62 | |
dsamersoff@5832 | 63 | // close all library file descriptors |
dsamersoff@5832 | 64 | lib = ph->libs; |
dsamersoff@5832 | 65 | while (lib) { |
dsamersoff@5832 | 66 | int fd = lib->fd; |
dsamersoff@5832 | 67 | if (fd >= 0 && fd != ph->core->exec_fd) { |
dsamersoff@5832 | 68 | close(fd); |
dsamersoff@5832 | 69 | } |
dsamersoff@5832 | 70 | lib = lib->next; |
dsamersoff@5832 | 71 | } |
duke@435 | 72 | } |
duke@435 | 73 | |
duke@435 | 74 | // clean all map_info stuff |
duke@435 | 75 | static void destroy_map_info(struct ps_prochandle* ph) { |
duke@435 | 76 | map_info* map = ph->core->maps; |
duke@435 | 77 | while (map) { |
dsamersoff@5832 | 78 | map_info* next = map->next; |
dsamersoff@5832 | 79 | free(map); |
dsamersoff@5832 | 80 | map = next; |
duke@435 | 81 | } |
duke@435 | 82 | |
duke@435 | 83 | if (ph->core->map_array) { |
dsamersoff@5832 | 84 | free(ph->core->map_array); |
duke@435 | 85 | } |
duke@435 | 86 | |
duke@435 | 87 | // Part of the class sharing workaround |
duke@435 | 88 | map = ph->core->class_share_maps; |
duke@435 | 89 | while (map) { |
dsamersoff@5832 | 90 | map_info* next = map->next; |
dsamersoff@5832 | 91 | free(map); |
dsamersoff@5832 | 92 | map = next; |
duke@435 | 93 | } |
duke@435 | 94 | } |
duke@435 | 95 | |
duke@435 | 96 | // ps_prochandle operations |
duke@435 | 97 | static void core_release(struct ps_prochandle* ph) { |
dsamersoff@5832 | 98 | if (ph->core) { |
dsamersoff@5832 | 99 | close_files(ph); |
dsamersoff@5832 | 100 | destroy_map_info(ph); |
dsamersoff@5832 | 101 | free(ph->core); |
dsamersoff@5832 | 102 | } |
duke@435 | 103 | } |
duke@435 | 104 | |
duke@435 | 105 | static map_info* allocate_init_map(int fd, off_t offset, uintptr_t vaddr, size_t memsz) { |
dsamersoff@5832 | 106 | map_info* map; |
dsamersoff@5832 | 107 | if ( (map = (map_info*) calloc(1, sizeof(map_info))) == NULL) { |
dsamersoff@5832 | 108 | print_debug("can't allocate memory for map_info\n"); |
dsamersoff@5832 | 109 | return NULL; |
dsamersoff@5832 | 110 | } |
duke@435 | 111 | |
dsamersoff@5832 | 112 | // initialize map |
dsamersoff@5832 | 113 | map->fd = fd; |
dsamersoff@5832 | 114 | map->offset = offset; |
dsamersoff@5832 | 115 | map->vaddr = vaddr; |
dsamersoff@5832 | 116 | map->memsz = memsz; |
dsamersoff@5832 | 117 | return map; |
duke@435 | 118 | } |
duke@435 | 119 | |
duke@435 | 120 | // add map info with given fd, offset, vaddr and memsz |
duke@435 | 121 | static map_info* add_map_info(struct ps_prochandle* ph, int fd, off_t offset, |
duke@435 | 122 | uintptr_t vaddr, size_t memsz) { |
dsamersoff@5832 | 123 | map_info* map; |
dsamersoff@5832 | 124 | if ((map = allocate_init_map(fd, offset, vaddr, memsz)) == NULL) { |
dsamersoff@5832 | 125 | return NULL; |
dsamersoff@5832 | 126 | } |
duke@435 | 127 | |
dsamersoff@5832 | 128 | // add this to map list |
dsamersoff@5832 | 129 | map->next = ph->core->maps; |
dsamersoff@5832 | 130 | ph->core->maps = map; |
dsamersoff@5832 | 131 | ph->core->num_maps++; |
duke@435 | 132 | |
dsamersoff@5832 | 133 | return map; |
duke@435 | 134 | } |
duke@435 | 135 | |
duke@435 | 136 | // Part of the class sharing workaround |
dsamersoff@5832 | 137 | static map_info* add_class_share_map_info(struct ps_prochandle* ph, off_t offset, |
duke@435 | 138 | uintptr_t vaddr, size_t memsz) { |
dsamersoff@5832 | 139 | map_info* map; |
dsamersoff@5832 | 140 | if ((map = allocate_init_map(ph->core->classes_jsa_fd, |
dsamersoff@5832 | 141 | offset, vaddr, memsz)) == NULL) { |
dsamersoff@5832 | 142 | return NULL; |
dsamersoff@5832 | 143 | } |
duke@435 | 144 | |
dsamersoff@5832 | 145 | map->next = ph->core->class_share_maps; |
dsamersoff@5832 | 146 | ph->core->class_share_maps = map; |
dsamersoff@5832 | 147 | return map; |
duke@435 | 148 | } |
duke@435 | 149 | |
duke@435 | 150 | // Return the map_info for the given virtual address. We keep a sorted |
duke@435 | 151 | // array of pointers in ph->map_array, so we can binary search. |
dsamersoff@5832 | 152 | static map_info* core_lookup(struct ps_prochandle *ph, uintptr_t addr) { |
dsamersoff@5832 | 153 | int mid, lo = 0, hi = ph->core->num_maps - 1; |
dsamersoff@5832 | 154 | map_info *mp; |
duke@435 | 155 | |
dsamersoff@5832 | 156 | while (hi - lo > 1) { |
dsamersoff@5832 | 157 | mid = (lo + hi) / 2; |
dsamersoff@5832 | 158 | if (addr >= ph->core->map_array[mid]->vaddr) { |
dsamersoff@5832 | 159 | lo = mid; |
dsamersoff@5832 | 160 | } else { |
dsamersoff@5832 | 161 | hi = mid; |
dsamersoff@5832 | 162 | } |
dsamersoff@5832 | 163 | } |
duke@435 | 164 | |
dsamersoff@5832 | 165 | if (addr < ph->core->map_array[hi]->vaddr) { |
dsamersoff@5832 | 166 | mp = ph->core->map_array[lo]; |
dsamersoff@5832 | 167 | } else { |
dsamersoff@5832 | 168 | mp = ph->core->map_array[hi]; |
dsamersoff@5832 | 169 | } |
duke@435 | 170 | |
dsamersoff@5832 | 171 | if (addr >= mp->vaddr && addr < mp->vaddr + mp->memsz) { |
dsamersoff@5832 | 172 | return (mp); |
dsamersoff@5832 | 173 | } |
dsamersoff@5832 | 174 | |
dsamersoff@5832 | 175 | |
dsamersoff@5832 | 176 | // Part of the class sharing workaround |
dsamersoff@5832 | 177 | // Unfortunately, we have no way of detecting -Xshare state. |
dsamersoff@5832 | 178 | // Check out the share maps atlast, if we don't find anywhere. |
dsamersoff@5832 | 179 | // This is done this way so to avoid reading share pages |
dsamersoff@5832 | 180 | // ahead of other normal maps. For eg. with -Xshare:off we don't |
dsamersoff@5832 | 181 | // want to prefer class sharing data to data from core. |
dsamersoff@5832 | 182 | mp = ph->core->class_share_maps; |
dsamersoff@5832 | 183 | if (mp) { |
dsamersoff@5832 | 184 | print_debug("can't locate map_info at 0x%lx, trying class share maps\n", addr); |
dsamersoff@5832 | 185 | } |
dsamersoff@5832 | 186 | while (mp) { |
dsamersoff@5832 | 187 | if (addr >= mp->vaddr && addr < mp->vaddr + mp->memsz) { |
dsamersoff@5832 | 188 | print_debug("located map_info at 0x%lx from class share maps\n", addr); |
duke@435 | 189 | return (mp); |
dsamersoff@5832 | 190 | } |
dsamersoff@5832 | 191 | mp = mp->next; |
dsamersoff@5832 | 192 | } |
duke@435 | 193 | |
dsamersoff@5832 | 194 | print_debug("can't locate map_info at 0x%lx\n", addr); |
dsamersoff@5832 | 195 | return (NULL); |
duke@435 | 196 | } |
duke@435 | 197 | |
duke@435 | 198 | //--------------------------------------------------------------- |
duke@435 | 199 | // Part of the class sharing workaround: |
duke@435 | 200 | // |
sla@5061 | 201 | // With class sharing, pages are mapped from classes.jsa file. |
duke@435 | 202 | // The read-only class sharing pages are mapped as MAP_SHARED, |
duke@435 | 203 | // PROT_READ pages. These pages are not dumped into core dump. |
sla@5061 | 204 | // With this workaround, these pages are read from classes.jsa. |
duke@435 | 205 | |
duke@435 | 206 | // FIXME: !HACK ALERT! |
duke@435 | 207 | // The format of sharing achive file header is needed to read shared heap |
duke@435 | 208 | // file mappings. For now, I am hard coding portion of FileMapHeader here. |
duke@435 | 209 | // Refer to filemap.hpp. |
duke@435 | 210 | |
duke@435 | 211 | // FileMapHeader describes the shared space data in the file to be |
duke@435 | 212 | // mapped. This structure gets written to a file. It is not a class, |
duke@435 | 213 | // so that the compilers don't add any compiler-private data to it. |
duke@435 | 214 | |
duke@435 | 215 | #define NUM_SHARED_MAPS 4 |
duke@435 | 216 | |
duke@435 | 217 | // Refer to FileMapInfo::_current_version in filemap.hpp |
duke@435 | 218 | #define CURRENT_ARCHIVE_VERSION 1 |
duke@435 | 219 | |
duke@435 | 220 | struct FileMapHeader { |
duke@435 | 221 | int _magic; // identify file type. |
duke@435 | 222 | int _version; // (from enum, above.) |
duke@435 | 223 | size_t _alignment; // how shared archive should be aligned |
duke@435 | 224 | |
duke@435 | 225 | struct space_info { |
duke@435 | 226 | int _file_offset; // sizeof(this) rounded to vm page size |
duke@435 | 227 | char* _base; // copy-on-write base address |
duke@435 | 228 | size_t _capacity; // for validity checking |
duke@435 | 229 | size_t _used; // for setting space top on read |
duke@435 | 230 | |
duke@435 | 231 | // 4991491 NOTICE These are C++ bool's in filemap.hpp and must match up with |
dsamersoff@5832 | 232 | // the C type matching the C++ bool type on any given platform. |
dsamersoff@5832 | 233 | // We assume the corresponding C type is char but licensees |
dsamersoff@5832 | 234 | // may need to adjust the type of these fields. |
duke@435 | 235 | char _read_only; // read only space? |
duke@435 | 236 | char _allow_exec; // executable code in space? |
duke@435 | 237 | |
coleenp@4037 | 238 | } _space[NUM_SHARED_MAPS]; |
duke@435 | 239 | |
duke@435 | 240 | // Ignore the rest of the FileMapHeader. We don't need those fields here. |
duke@435 | 241 | }; |
duke@435 | 242 | |
swamyv@964 | 243 | static bool read_jboolean(struct ps_prochandle* ph, uintptr_t addr, jboolean* pvalue) { |
dsamersoff@5832 | 244 | jboolean i; |
dsamersoff@5832 | 245 | if (ps_pdread(ph, (psaddr_t) addr, &i, sizeof(i)) == PS_OK) { |
dsamersoff@5832 | 246 | *pvalue = i; |
dsamersoff@5832 | 247 | return true; |
dsamersoff@5832 | 248 | } else { |
dsamersoff@5832 | 249 | return false; |
dsamersoff@5832 | 250 | } |
duke@435 | 251 | } |
duke@435 | 252 | |
duke@435 | 253 | static bool read_pointer(struct ps_prochandle* ph, uintptr_t addr, uintptr_t* pvalue) { |
dsamersoff@5832 | 254 | uintptr_t uip; |
dsamersoff@5832 | 255 | if (ps_pdread(ph, (psaddr_t) addr, (char *)&uip, sizeof(uip)) == PS_OK) { |
dsamersoff@5832 | 256 | *pvalue = uip; |
dsamersoff@5832 | 257 | return true; |
dsamersoff@5832 | 258 | } else { |
dsamersoff@5832 | 259 | return false; |
dsamersoff@5832 | 260 | } |
duke@435 | 261 | } |
duke@435 | 262 | |
duke@435 | 263 | // used to read strings from debuggee |
duke@435 | 264 | static bool read_string(struct ps_prochandle* ph, uintptr_t addr, char* buf, size_t size) { |
dsamersoff@5832 | 265 | size_t i = 0; |
dsamersoff@5832 | 266 | char c = ' '; |
duke@435 | 267 | |
dsamersoff@5832 | 268 | while (c != '\0') { |
dsamersoff@5832 | 269 | if (ps_pdread(ph, (psaddr_t) addr, &c, sizeof(char)) != PS_OK) { |
dsamersoff@5832 | 270 | return false; |
dsamersoff@5832 | 271 | } |
dsamersoff@5832 | 272 | if (i < size - 1) { |
dsamersoff@5832 | 273 | buf[i] = c; |
dsamersoff@5832 | 274 | } else { |
dsamersoff@5832 | 275 | // smaller buffer |
dsamersoff@5832 | 276 | return false; |
dsamersoff@5832 | 277 | } |
dsamersoff@5832 | 278 | i++; addr++; |
dsamersoff@5832 | 279 | } |
duke@435 | 280 | |
dsamersoff@5832 | 281 | buf[i] = '\0'; |
dsamersoff@5832 | 282 | return true; |
duke@435 | 283 | } |
duke@435 | 284 | |
duke@435 | 285 | #define USE_SHARED_SPACES_SYM "UseSharedSpaces" |
duke@435 | 286 | // mangled name of Arguments::SharedArchivePath |
duke@435 | 287 | #define SHARED_ARCHIVE_PATH_SYM "_ZN9Arguments17SharedArchivePathE" |
dsamersoff@5832 | 288 | #define LIBJVM_NAME "/libjvm.so" |
duke@435 | 289 | |
duke@435 | 290 | static bool init_classsharing_workaround(struct ps_prochandle* ph) { |
dsamersoff@5832 | 291 | lib_info* lib = ph->libs; |
dsamersoff@5832 | 292 | while (lib != NULL) { |
dsamersoff@5832 | 293 | // we are iterating over shared objects from the core dump. look for |
dsamersoff@5832 | 294 | // libjvm.so. |
dsamersoff@5832 | 295 | const char *jvm_name = 0; |
dsamersoff@5832 | 296 | if ((jvm_name = strstr(lib->name, LIBJVM_NAME)) != 0) { |
dsamersoff@5832 | 297 | char classes_jsa[PATH_MAX]; |
dsamersoff@5832 | 298 | struct FileMapHeader header; |
dsamersoff@5832 | 299 | int fd = -1; |
dsamersoff@5832 | 300 | int m = 0; |
dsamersoff@5832 | 301 | size_t n = 0; |
dsamersoff@5832 | 302 | uintptr_t base = 0, useSharedSpacesAddr = 0; |
dsamersoff@5832 | 303 | uintptr_t sharedArchivePathAddrAddr = 0, sharedArchivePathAddr = 0; |
dsamersoff@5832 | 304 | jboolean useSharedSpaces = 0; |
dsamersoff@5832 | 305 | map_info* mi = 0; |
duke@435 | 306 | |
dsamersoff@5832 | 307 | memset(classes_jsa, 0, sizeof(classes_jsa)); |
dsamersoff@5832 | 308 | jvm_name = lib->name; |
dsamersoff@5832 | 309 | useSharedSpacesAddr = lookup_symbol(ph, jvm_name, USE_SHARED_SPACES_SYM); |
dsamersoff@5832 | 310 | if (useSharedSpacesAddr == 0) { |
dsamersoff@5832 | 311 | print_debug("can't lookup 'UseSharedSpaces' flag\n"); |
dsamersoff@5832 | 312 | return false; |
dsamersoff@5832 | 313 | } |
duke@435 | 314 | |
dsamersoff@5832 | 315 | // Hotspot vm types are not exported to build this library. So |
dsamersoff@5832 | 316 | // using equivalent type jboolean to read the value of |
dsamersoff@5832 | 317 | // UseSharedSpaces which is same as hotspot type "bool". |
dsamersoff@5832 | 318 | if (read_jboolean(ph, useSharedSpacesAddr, &useSharedSpaces) != true) { |
dsamersoff@5832 | 319 | print_debug("can't read the value of 'UseSharedSpaces' flag\n"); |
dsamersoff@5832 | 320 | return false; |
dsamersoff@5832 | 321 | } |
duke@435 | 322 | |
dsamersoff@5832 | 323 | if ((int)useSharedSpaces == 0) { |
dsamersoff@5832 | 324 | print_debug("UseSharedSpaces is false, assuming -Xshare:off!\n"); |
dsamersoff@5832 | 325 | return true; |
dsamersoff@5832 | 326 | } |
duke@435 | 327 | |
dsamersoff@5832 | 328 | sharedArchivePathAddrAddr = lookup_symbol(ph, jvm_name, SHARED_ARCHIVE_PATH_SYM); |
dsamersoff@5832 | 329 | if (sharedArchivePathAddrAddr == 0) { |
dsamersoff@5832 | 330 | print_debug("can't lookup shared archive path symbol\n"); |
dsamersoff@5832 | 331 | return false; |
dsamersoff@5832 | 332 | } |
duke@435 | 333 | |
dsamersoff@5832 | 334 | if (read_pointer(ph, sharedArchivePathAddrAddr, &sharedArchivePathAddr) != true) { |
dsamersoff@5832 | 335 | print_debug("can't read shared archive path pointer\n"); |
dsamersoff@5832 | 336 | return false; |
dsamersoff@5832 | 337 | } |
duke@435 | 338 | |
dsamersoff@5832 | 339 | if (read_string(ph, sharedArchivePathAddr, classes_jsa, sizeof(classes_jsa)) != true) { |
dsamersoff@5832 | 340 | print_debug("can't read shared archive path value\n"); |
dsamersoff@5832 | 341 | return false; |
dsamersoff@5832 | 342 | } |
duke@435 | 343 | |
dsamersoff@5832 | 344 | print_debug("looking for %s\n", classes_jsa); |
dsamersoff@5832 | 345 | // open the class sharing archive file |
dsamersoff@5832 | 346 | fd = pathmap_open(classes_jsa); |
dsamersoff@5832 | 347 | if (fd < 0) { |
dsamersoff@5832 | 348 | print_debug("can't open %s!\n", classes_jsa); |
dsamersoff@5832 | 349 | ph->core->classes_jsa_fd = -1; |
dsamersoff@5832 | 350 | return false; |
dsamersoff@5832 | 351 | } else { |
dsamersoff@5832 | 352 | print_debug("opened %s\n", classes_jsa); |
dsamersoff@5832 | 353 | } |
duke@435 | 354 | |
dsamersoff@5832 | 355 | // read FileMapHeader from the file |
dsamersoff@5832 | 356 | memset(&header, 0, sizeof(struct FileMapHeader)); |
dsamersoff@5832 | 357 | if ((n = read(fd, &header, sizeof(struct FileMapHeader))) |
dsamersoff@5832 | 358 | != sizeof(struct FileMapHeader)) { |
dsamersoff@5832 | 359 | print_debug("can't read shared archive file map header from %s\n", classes_jsa); |
dsamersoff@5832 | 360 | close(fd); |
dsamersoff@5832 | 361 | return false; |
dsamersoff@5832 | 362 | } |
duke@435 | 363 | |
dsamersoff@5832 | 364 | // check file magic |
dsamersoff@5832 | 365 | if (header._magic != 0xf00baba2) { |
dsamersoff@5832 | 366 | print_debug("%s has bad shared archive file magic number 0x%x, expecing 0xf00baba2\n", |
dsamersoff@5832 | 367 | classes_jsa, header._magic); |
dsamersoff@5832 | 368 | close(fd); |
dsamersoff@5832 | 369 | return false; |
dsamersoff@5832 | 370 | } |
duke@435 | 371 | |
dsamersoff@5832 | 372 | // check version |
dsamersoff@5832 | 373 | if (header._version != CURRENT_ARCHIVE_VERSION) { |
dsamersoff@5832 | 374 | print_debug("%s has wrong shared archive file version %d, expecting %d\n", |
dsamersoff@5832 | 375 | classes_jsa, header._version, CURRENT_ARCHIVE_VERSION); |
dsamersoff@5832 | 376 | close(fd); |
dsamersoff@5832 | 377 | return false; |
dsamersoff@5832 | 378 | } |
duke@435 | 379 | |
dsamersoff@5832 | 380 | ph->core->classes_jsa_fd = fd; |
dsamersoff@5832 | 381 | // add read-only maps from classes.jsa to the list of maps |
dsamersoff@5832 | 382 | for (m = 0; m < NUM_SHARED_MAPS; m++) { |
dsamersoff@5832 | 383 | if (header._space[m]._read_only) { |
dsamersoff@5832 | 384 | base = (uintptr_t) header._space[m]._base; |
dsamersoff@5832 | 385 | // no need to worry about the fractional pages at-the-end. |
dsamersoff@5832 | 386 | // possible fractional pages are handled by core_read_data. |
dsamersoff@5832 | 387 | add_class_share_map_info(ph, (off_t) header._space[m]._file_offset, |
dsamersoff@5832 | 388 | base, (size_t) header._space[m]._used); |
dsamersoff@5832 | 389 | print_debug("added a share archive map at 0x%lx\n", base); |
dsamersoff@5832 | 390 | } |
duke@435 | 391 | } |
dsamersoff@5832 | 392 | return true; |
duke@435 | 393 | } |
dsamersoff@5832 | 394 | lib = lib->next; |
dsamersoff@5832 | 395 | } |
dsamersoff@5832 | 396 | return true; |
duke@435 | 397 | } |
duke@435 | 398 | |
duke@435 | 399 | |
duke@435 | 400 | //--------------------------------------------------------------------------- |
duke@435 | 401 | // functions to handle map_info |
duke@435 | 402 | |
duke@435 | 403 | // Order mappings based on virtual address. We use this function as the |
duke@435 | 404 | // callback for sorting the array of map_info pointers. |
duke@435 | 405 | static int core_cmp_mapping(const void *lhsp, const void *rhsp) |
duke@435 | 406 | { |
dsamersoff@5832 | 407 | const map_info *lhs = *((const map_info **)lhsp); |
dsamersoff@5832 | 408 | const map_info *rhs = *((const map_info **)rhsp); |
duke@435 | 409 | |
dsamersoff@5832 | 410 | if (lhs->vaddr == rhs->vaddr) { |
dsamersoff@5832 | 411 | return (0); |
dsamersoff@5832 | 412 | } |
duke@435 | 413 | |
dsamersoff@5832 | 414 | return (lhs->vaddr < rhs->vaddr ? -1 : 1); |
duke@435 | 415 | } |
duke@435 | 416 | |
duke@435 | 417 | // we sort map_info by starting virtual address so that we can do |
duke@435 | 418 | // binary search to read from an address. |
duke@435 | 419 | static bool sort_map_array(struct ps_prochandle* ph) { |
dsamersoff@5832 | 420 | size_t num_maps = ph->core->num_maps; |
dsamersoff@5832 | 421 | map_info* map = ph->core->maps; |
dsamersoff@5832 | 422 | int i = 0; |
duke@435 | 423 | |
dsamersoff@5832 | 424 | // allocate map_array |
dsamersoff@5832 | 425 | map_info** array; |
dsamersoff@5832 | 426 | if ( (array = (map_info**) malloc(sizeof(map_info*) * num_maps)) == NULL) { |
dsamersoff@5832 | 427 | print_debug("can't allocate memory for map array\n"); |
dsamersoff@5832 | 428 | return false; |
dsamersoff@5832 | 429 | } |
duke@435 | 430 | |
dsamersoff@5832 | 431 | // add maps to array |
dsamersoff@5832 | 432 | while (map) { |
dsamersoff@5832 | 433 | array[i] = map; |
dsamersoff@5832 | 434 | i++; |
dsamersoff@5832 | 435 | map = map->next; |
dsamersoff@5832 | 436 | } |
duke@435 | 437 | |
dsamersoff@5832 | 438 | // sort is called twice. If this is second time, clear map array |
dsamersoff@5832 | 439 | if (ph->core->map_array) { |
dsamersoff@5832 | 440 | free(ph->core->map_array); |
dsamersoff@5832 | 441 | } |
duke@435 | 442 | |
dsamersoff@5832 | 443 | ph->core->map_array = array; |
dsamersoff@5832 | 444 | // sort the map_info array by base virtual address. |
dsamersoff@5832 | 445 | qsort(ph->core->map_array, ph->core->num_maps, sizeof (map_info*), |
dsamersoff@5832 | 446 | core_cmp_mapping); |
duke@435 | 447 | |
dsamersoff@5832 | 448 | // print map |
dsamersoff@5832 | 449 | if (is_debug()) { |
dsamersoff@5832 | 450 | int j = 0; |
dsamersoff@5832 | 451 | print_debug("---- sorted virtual address map ----\n"); |
dsamersoff@5832 | 452 | for (j = 0; j < ph->core->num_maps; j++) { |
dsamersoff@5832 | 453 | print_debug("base = 0x%lx\tsize = %zu\n", ph->core->map_array[j]->vaddr, |
dsamersoff@5832 | 454 | ph->core->map_array[j]->memsz); |
dsamersoff@5832 | 455 | } |
dsamersoff@5832 | 456 | } |
dsamersoff@5832 | 457 | |
dsamersoff@5832 | 458 | return true; |
duke@435 | 459 | } |
duke@435 | 460 | |
duke@435 | 461 | #ifndef MIN |
duke@435 | 462 | #define MIN(x, y) (((x) < (y))? (x): (y)) |
duke@435 | 463 | #endif |
duke@435 | 464 | |
duke@435 | 465 | static bool core_read_data(struct ps_prochandle* ph, uintptr_t addr, char *buf, size_t size) { |
duke@435 | 466 | ssize_t resid = size; |
duke@435 | 467 | int page_size=sysconf(_SC_PAGE_SIZE); |
duke@435 | 468 | while (resid != 0) { |
duke@435 | 469 | map_info *mp = core_lookup(ph, addr); |
duke@435 | 470 | uintptr_t mapoff; |
duke@435 | 471 | ssize_t len, rem; |
duke@435 | 472 | off_t off; |
duke@435 | 473 | int fd; |
duke@435 | 474 | |
dsamersoff@5832 | 475 | if (mp == NULL) { |
duke@435 | 476 | break; /* No mapping for this address */ |
dsamersoff@5832 | 477 | } |
duke@435 | 478 | |
duke@435 | 479 | fd = mp->fd; |
duke@435 | 480 | mapoff = addr - mp->vaddr; |
duke@435 | 481 | len = MIN(resid, mp->memsz - mapoff); |
duke@435 | 482 | off = mp->offset + mapoff; |
duke@435 | 483 | |
dsamersoff@5832 | 484 | if ((len = pread(fd, buf, len, off)) <= 0) { |
duke@435 | 485 | break; |
dsamersoff@5832 | 486 | } |
duke@435 | 487 | |
duke@435 | 488 | resid -= len; |
duke@435 | 489 | addr += len; |
duke@435 | 490 | buf = (char *)buf + len; |
duke@435 | 491 | |
duke@435 | 492 | // mappings always start at page boundary. But, may end in fractional |
duke@435 | 493 | // page. fill zeros for possible fractional page at the end of a mapping. |
duke@435 | 494 | rem = mp->memsz % page_size; |
duke@435 | 495 | if (rem > 0) { |
duke@435 | 496 | rem = page_size - rem; |
duke@435 | 497 | len = MIN(resid, rem); |
duke@435 | 498 | resid -= len; |
duke@435 | 499 | addr += len; |
duke@435 | 500 | // we are not assuming 'buf' to be zero initialized. |
duke@435 | 501 | memset(buf, 0, len); |
duke@435 | 502 | buf += len; |
duke@435 | 503 | } |
duke@435 | 504 | } |
duke@435 | 505 | |
duke@435 | 506 | if (resid) { |
duke@435 | 507 | print_debug("core read failed for %d byte(s) @ 0x%lx (%d more bytes)\n", |
duke@435 | 508 | size, addr, resid); |
duke@435 | 509 | return false; |
duke@435 | 510 | } else { |
duke@435 | 511 | return true; |
duke@435 | 512 | } |
duke@435 | 513 | } |
duke@435 | 514 | |
duke@435 | 515 | // null implementation for write |
duke@435 | 516 | static bool core_write_data(struct ps_prochandle* ph, |
duke@435 | 517 | uintptr_t addr, const char *buf , size_t size) { |
duke@435 | 518 | return false; |
duke@435 | 519 | } |
duke@435 | 520 | |
duke@435 | 521 | static bool core_get_lwp_regs(struct ps_prochandle* ph, lwpid_t lwp_id, |
duke@435 | 522 | struct user_regs_struct* regs) { |
duke@435 | 523 | // for core we have cached the lwp regs from NOTE section |
duke@435 | 524 | thread_info* thr = ph->threads; |
duke@435 | 525 | while (thr) { |
duke@435 | 526 | if (thr->lwp_id == lwp_id) { |
duke@435 | 527 | memcpy(regs, &thr->regs, sizeof(struct user_regs_struct)); |
duke@435 | 528 | return true; |
duke@435 | 529 | } |
duke@435 | 530 | thr = thr->next; |
duke@435 | 531 | } |
duke@435 | 532 | return false; |
duke@435 | 533 | } |
duke@435 | 534 | |
duke@435 | 535 | static ps_prochandle_ops core_ops = { |
dcubed@485 | 536 | .release= core_release, |
dcubed@485 | 537 | .p_pread= core_read_data, |
dcubed@485 | 538 | .p_pwrite= core_write_data, |
dcubed@485 | 539 | .get_lwp_regs= core_get_lwp_regs |
duke@435 | 540 | }; |
duke@435 | 541 | |
duke@435 | 542 | // read regs and create thread from NT_PRSTATUS entries from core file |
duke@435 | 543 | static bool core_handle_prstatus(struct ps_prochandle* ph, const char* buf, size_t nbytes) { |
duke@435 | 544 | // we have to read prstatus_t from buf |
duke@435 | 545 | // assert(nbytes == sizeof(prstaus_t), "size mismatch on prstatus_t"); |
duke@435 | 546 | prstatus_t* prstat = (prstatus_t*) buf; |
duke@435 | 547 | thread_info* newthr; |
duke@435 | 548 | print_debug("got integer regset for lwp %d\n", prstat->pr_pid); |
duke@435 | 549 | // we set pthread_t to -1 for core dump |
duke@435 | 550 | if((newthr = add_thread_info(ph, (pthread_t) -1, prstat->pr_pid)) == NULL) |
duke@435 | 551 | return false; |
duke@435 | 552 | |
duke@435 | 553 | // copy regs |
duke@435 | 554 | memcpy(&newthr->regs, prstat->pr_reg, sizeof(struct user_regs_struct)); |
duke@435 | 555 | |
duke@435 | 556 | if (is_debug()) { |
duke@435 | 557 | print_debug("integer regset\n"); |
duke@435 | 558 | #ifdef i386 |
duke@435 | 559 | // print the regset |
duke@435 | 560 | print_debug("\teax = 0x%x\n", newthr->regs.eax); |
duke@435 | 561 | print_debug("\tebx = 0x%x\n", newthr->regs.ebx); |
duke@435 | 562 | print_debug("\tecx = 0x%x\n", newthr->regs.ecx); |
duke@435 | 563 | print_debug("\tedx = 0x%x\n", newthr->regs.edx); |
duke@435 | 564 | print_debug("\tesp = 0x%x\n", newthr->regs.esp); |
duke@435 | 565 | print_debug("\tebp = 0x%x\n", newthr->regs.ebp); |
duke@435 | 566 | print_debug("\tesi = 0x%x\n", newthr->regs.esi); |
duke@435 | 567 | print_debug("\tedi = 0x%x\n", newthr->regs.edi); |
duke@435 | 568 | print_debug("\teip = 0x%x\n", newthr->regs.eip); |
duke@435 | 569 | #endif |
duke@435 | 570 | |
duke@435 | 571 | #if defined(amd64) || defined(x86_64) |
duke@435 | 572 | // print the regset |
duke@435 | 573 | print_debug("\tr15 = 0x%lx\n", newthr->regs.r15); |
duke@435 | 574 | print_debug("\tr14 = 0x%lx\n", newthr->regs.r14); |
duke@435 | 575 | print_debug("\tr13 = 0x%lx\n", newthr->regs.r13); |
duke@435 | 576 | print_debug("\tr12 = 0x%lx\n", newthr->regs.r12); |
duke@435 | 577 | print_debug("\trbp = 0x%lx\n", newthr->regs.rbp); |
duke@435 | 578 | print_debug("\trbx = 0x%lx\n", newthr->regs.rbx); |
duke@435 | 579 | print_debug("\tr11 = 0x%lx\n", newthr->regs.r11); |
duke@435 | 580 | print_debug("\tr10 = 0x%lx\n", newthr->regs.r10); |
duke@435 | 581 | print_debug("\tr9 = 0x%lx\n", newthr->regs.r9); |
duke@435 | 582 | print_debug("\tr8 = 0x%lx\n", newthr->regs.r8); |
duke@435 | 583 | print_debug("\trax = 0x%lx\n", newthr->regs.rax); |
duke@435 | 584 | print_debug("\trcx = 0x%lx\n", newthr->regs.rcx); |
duke@435 | 585 | print_debug("\trdx = 0x%lx\n", newthr->regs.rdx); |
duke@435 | 586 | print_debug("\trsi = 0x%lx\n", newthr->regs.rsi); |
duke@435 | 587 | print_debug("\trdi = 0x%lx\n", newthr->regs.rdi); |
duke@435 | 588 | print_debug("\torig_rax = 0x%lx\n", newthr->regs.orig_rax); |
duke@435 | 589 | print_debug("\trip = 0x%lx\n", newthr->regs.rip); |
duke@435 | 590 | print_debug("\tcs = 0x%lx\n", newthr->regs.cs); |
duke@435 | 591 | print_debug("\teflags = 0x%lx\n", newthr->regs.eflags); |
duke@435 | 592 | print_debug("\trsp = 0x%lx\n", newthr->regs.rsp); |
duke@435 | 593 | print_debug("\tss = 0x%lx\n", newthr->regs.ss); |
duke@435 | 594 | print_debug("\tfs_base = 0x%lx\n", newthr->regs.fs_base); |
duke@435 | 595 | print_debug("\tgs_base = 0x%lx\n", newthr->regs.gs_base); |
duke@435 | 596 | print_debug("\tds = 0x%lx\n", newthr->regs.ds); |
duke@435 | 597 | print_debug("\tes = 0x%lx\n", newthr->regs.es); |
duke@435 | 598 | print_debug("\tfs = 0x%lx\n", newthr->regs.fs); |
duke@435 | 599 | print_debug("\tgs = 0x%lx\n", newthr->regs.gs); |
duke@435 | 600 | #endif |
duke@435 | 601 | } |
duke@435 | 602 | |
duke@435 | 603 | return true; |
duke@435 | 604 | } |
duke@435 | 605 | |
duke@435 | 606 | #define ROUNDUP(x, y) ((((x)+((y)-1))/(y))*(y)) |
duke@435 | 607 | |
duke@435 | 608 | // read NT_PRSTATUS entries from core NOTE segment |
duke@435 | 609 | static bool core_handle_note(struct ps_prochandle* ph, ELF_PHDR* note_phdr) { |
duke@435 | 610 | char* buf = NULL; |
duke@435 | 611 | char* p = NULL; |
duke@435 | 612 | size_t size = note_phdr->p_filesz; |
duke@435 | 613 | |
duke@435 | 614 | // we are interested in just prstatus entries. we will ignore the rest. |
duke@435 | 615 | // Advance the seek pointer to the start of the PT_NOTE data |
duke@435 | 616 | if (lseek(ph->core->core_fd, note_phdr->p_offset, SEEK_SET) == (off_t)-1) { |
duke@435 | 617 | print_debug("failed to lseek to PT_NOTE data\n"); |
duke@435 | 618 | return false; |
duke@435 | 619 | } |
duke@435 | 620 | |
duke@435 | 621 | // Now process the PT_NOTE structures. Each one is preceded by |
duke@435 | 622 | // an Elf{32/64}_Nhdr structure describing its type and size. |
duke@435 | 623 | if ( (buf = (char*) malloc(size)) == NULL) { |
duke@435 | 624 | print_debug("can't allocate memory for reading core notes\n"); |
duke@435 | 625 | goto err; |
duke@435 | 626 | } |
duke@435 | 627 | |
duke@435 | 628 | // read notes into buffer |
duke@435 | 629 | if (read(ph->core->core_fd, buf, size) != size) { |
duke@435 | 630 | print_debug("failed to read notes, core file must have been truncated\n"); |
duke@435 | 631 | goto err; |
duke@435 | 632 | } |
duke@435 | 633 | |
duke@435 | 634 | p = buf; |
duke@435 | 635 | while (p < buf + size) { |
duke@435 | 636 | ELF_NHDR* notep = (ELF_NHDR*) p; |
duke@435 | 637 | char* descdata = p + sizeof(ELF_NHDR) + ROUNDUP(notep->n_namesz, 4); |
duke@435 | 638 | print_debug("Note header with n_type = %d and n_descsz = %u\n", |
duke@435 | 639 | notep->n_type, notep->n_descsz); |
duke@435 | 640 | |
duke@435 | 641 | if (notep->n_type == NT_PRSTATUS) { |
dsamersoff@5832 | 642 | if (core_handle_prstatus(ph, descdata, notep->n_descsz) != true) { |
dsamersoff@5832 | 643 | return false; |
dsamersoff@5832 | 644 | } |
duke@435 | 645 | } |
duke@435 | 646 | p = descdata + ROUNDUP(notep->n_descsz, 4); |
duke@435 | 647 | } |
duke@435 | 648 | |
duke@435 | 649 | free(buf); |
duke@435 | 650 | return true; |
duke@435 | 651 | |
duke@435 | 652 | err: |
duke@435 | 653 | if (buf) free(buf); |
duke@435 | 654 | return false; |
duke@435 | 655 | } |
duke@435 | 656 | |
duke@435 | 657 | // read all segments from core file |
duke@435 | 658 | static bool read_core_segments(struct ps_prochandle* ph, ELF_EHDR* core_ehdr) { |
duke@435 | 659 | int i = 0; |
duke@435 | 660 | ELF_PHDR* phbuf = NULL; |
duke@435 | 661 | ELF_PHDR* core_php = NULL; |
duke@435 | 662 | |
duke@435 | 663 | if ((phbuf = read_program_header_table(ph->core->core_fd, core_ehdr)) == NULL) |
duke@435 | 664 | return false; |
duke@435 | 665 | |
duke@435 | 666 | /* |
duke@435 | 667 | * Now iterate through the program headers in the core file. |
duke@435 | 668 | * We're interested in two types of Phdrs: PT_NOTE (which |
duke@435 | 669 | * contains a set of saved /proc structures), and PT_LOAD (which |
duke@435 | 670 | * represents a memory mapping from the process's address space). |
duke@435 | 671 | * |
dsamersoff@5832 | 672 | * Difference b/w Solaris PT_NOTE and Linux/BSD PT_NOTE: |
duke@435 | 673 | * |
duke@435 | 674 | * In Solaris there are two PT_NOTE segments the first PT_NOTE (if present) |
duke@435 | 675 | * contains /proc structs in the pre-2.6 unstructured /proc format. the last |
duke@435 | 676 | * PT_NOTE has data in new /proc format. |
duke@435 | 677 | * |
duke@435 | 678 | * In Solaris, there is only one pstatus (process status). pstatus contains |
duke@435 | 679 | * integer register set among other stuff. For each LWP, we have one lwpstatus |
duke@435 | 680 | * entry that has integer regset for that LWP. |
duke@435 | 681 | * |
duke@435 | 682 | * Linux threads are actually 'clone'd processes. To support core analysis |
duke@435 | 683 | * of "multithreaded" process, Linux creates more than one pstatus (called |
duke@435 | 684 | * "prstatus") entry in PT_NOTE. Each prstatus entry has integer regset for one |
duke@435 | 685 | * "thread". Please refer to Linux kernel src file 'fs/binfmt_elf.c', in particular |
duke@435 | 686 | * function "elf_core_dump". |
duke@435 | 687 | */ |
duke@435 | 688 | |
duke@435 | 689 | for (core_php = phbuf, i = 0; i < core_ehdr->e_phnum; i++) { |
duke@435 | 690 | switch (core_php->p_type) { |
duke@435 | 691 | case PT_NOTE: |
dsamersoff@5832 | 692 | if (core_handle_note(ph, core_php) != true) { |
dsamersoff@5832 | 693 | goto err; |
dsamersoff@5832 | 694 | } |
duke@435 | 695 | break; |
duke@435 | 696 | |
duke@435 | 697 | case PT_LOAD: { |
duke@435 | 698 | if (core_php->p_filesz != 0) { |
duke@435 | 699 | if (add_map_info(ph, ph->core->core_fd, core_php->p_offset, |
duke@435 | 700 | core_php->p_vaddr, core_php->p_filesz) == NULL) goto err; |
duke@435 | 701 | } |
duke@435 | 702 | break; |
duke@435 | 703 | } |
duke@435 | 704 | } |
duke@435 | 705 | |
duke@435 | 706 | core_php++; |
duke@435 | 707 | } |
duke@435 | 708 | |
duke@435 | 709 | free(phbuf); |
duke@435 | 710 | return true; |
duke@435 | 711 | err: |
duke@435 | 712 | free(phbuf); |
duke@435 | 713 | return false; |
duke@435 | 714 | } |
duke@435 | 715 | |
duke@435 | 716 | // read segments of a shared object |
duke@435 | 717 | static bool read_lib_segments(struct ps_prochandle* ph, int lib_fd, ELF_EHDR* lib_ehdr, uintptr_t lib_base) { |
dsamersoff@5758 | 718 | int i = 0; |
dsamersoff@5758 | 719 | ELF_PHDR* phbuf; |
dsamersoff@5758 | 720 | ELF_PHDR* lib_php = NULL; |
duke@435 | 721 | |
dsamersoff@5961 | 722 | int page_size = sysconf(_SC_PAGE_SIZE); |
duke@435 | 723 | |
dsamersoff@5758 | 724 | if ((phbuf = read_program_header_table(lib_fd, lib_ehdr)) == NULL) { |
dsamersoff@5758 | 725 | return false; |
dsamersoff@5758 | 726 | } |
dsamersoff@5758 | 727 | |
dsamersoff@5758 | 728 | // we want to process only PT_LOAD segments that are not writable. |
dsamersoff@5758 | 729 | // i.e., text segments. The read/write/exec (data) segments would |
dsamersoff@5758 | 730 | // have been already added from core file segments. |
dsamersoff@5758 | 731 | for (lib_php = phbuf, i = 0; i < lib_ehdr->e_phnum; i++) { |
dsamersoff@5758 | 732 | if ((lib_php->p_type == PT_LOAD) && !(lib_php->p_flags & PF_W) && (lib_php->p_filesz != 0)) { |
dsamersoff@5758 | 733 | |
dsamersoff@5758 | 734 | uintptr_t target_vaddr = lib_php->p_vaddr + lib_base; |
dsamersoff@5758 | 735 | map_info *existing_map = core_lookup(ph, target_vaddr); |
dsamersoff@5758 | 736 | |
dsamersoff@5758 | 737 | if (existing_map == NULL){ |
dsamersoff@5758 | 738 | if (add_map_info(ph, lib_fd, lib_php->p_offset, |
dsamersoff@5961 | 739 | target_vaddr, lib_php->p_memsz) == NULL) { |
dsamersoff@5758 | 740 | goto err; |
dsamersoff@5758 | 741 | } |
dsamersoff@5758 | 742 | } else { |
dsamersoff@5961 | 743 | // Coredump stores value of p_memsz elf field |
dsamersoff@5961 | 744 | // rounded up to page boundary. |
dsamersoff@5961 | 745 | |
dsamersoff@5758 | 746 | if ((existing_map->memsz != page_size) && |
dsamersoff@5758 | 747 | (existing_map->fd != lib_fd) && |
dsamersoff@5961 | 748 | (ROUNDUP(existing_map->memsz, page_size) != ROUNDUP(lib_php->p_memsz, page_size))) { |
dsamersoff@5758 | 749 | |
dsamersoff@5961 | 750 | print_debug("address conflict @ 0x%lx (existing map size = %ld, size = %ld, flags = %d)\n", |
dsamersoff@5961 | 751 | target_vaddr, existing_map->memsz, lib_php->p_memsz, lib_php->p_flags); |
dsamersoff@5758 | 752 | goto err; |
dsamersoff@5758 | 753 | } |
dsamersoff@5758 | 754 | |
dsamersoff@5758 | 755 | /* replace PT_LOAD segment with library segment */ |
dsamersoff@5758 | 756 | print_debug("overwrote with new address mapping (memsz %ld -> %ld)\n", |
dsamersoff@5961 | 757 | existing_map->memsz, ROUNDUP(lib_php->p_memsz, page_size)); |
dsamersoff@5758 | 758 | |
dsamersoff@5758 | 759 | existing_map->fd = lib_fd; |
dsamersoff@5758 | 760 | existing_map->offset = lib_php->p_offset; |
dsamersoff@5961 | 761 | existing_map->memsz = ROUNDUP(lib_php->p_memsz, page_size); |
duke@435 | 762 | } |
dsamersoff@5758 | 763 | } |
duke@435 | 764 | |
dsamersoff@5758 | 765 | lib_php++; |
dsamersoff@5758 | 766 | } |
dsamersoff@5758 | 767 | |
dsamersoff@5758 | 768 | free(phbuf); |
dsamersoff@5758 | 769 | return true; |
duke@435 | 770 | err: |
dsamersoff@5758 | 771 | free(phbuf); |
dsamersoff@5758 | 772 | return false; |
duke@435 | 773 | } |
duke@435 | 774 | |
duke@435 | 775 | // process segments from interpreter (ld.so or ld-linux.so) |
duke@435 | 776 | static bool read_interp_segments(struct ps_prochandle* ph) { |
duke@435 | 777 | ELF_EHDR interp_ehdr; |
duke@435 | 778 | |
duke@435 | 779 | if (read_elf_header(ph->core->interp_fd, &interp_ehdr) != true) { |
duke@435 | 780 | print_debug("interpreter is not a valid ELF file\n"); |
duke@435 | 781 | return false; |
duke@435 | 782 | } |
duke@435 | 783 | |
duke@435 | 784 | if (read_lib_segments(ph, ph->core->interp_fd, &interp_ehdr, ph->core->ld_base_addr) != true) { |
duke@435 | 785 | print_debug("can't read segments of interpreter\n"); |
duke@435 | 786 | return false; |
duke@435 | 787 | } |
duke@435 | 788 | |
duke@435 | 789 | return true; |
duke@435 | 790 | } |
duke@435 | 791 | |
duke@435 | 792 | // process segments of a a.out |
duke@435 | 793 | static bool read_exec_segments(struct ps_prochandle* ph, ELF_EHDR* exec_ehdr) { |
duke@435 | 794 | int i = 0; |
duke@435 | 795 | ELF_PHDR* phbuf = NULL; |
duke@435 | 796 | ELF_PHDR* exec_php = NULL; |
duke@435 | 797 | |
duke@435 | 798 | if ((phbuf = read_program_header_table(ph->core->exec_fd, exec_ehdr)) == NULL) |
duke@435 | 799 | return false; |
duke@435 | 800 | |
duke@435 | 801 | for (exec_php = phbuf, i = 0; i < exec_ehdr->e_phnum; i++) { |
duke@435 | 802 | switch (exec_php->p_type) { |
duke@435 | 803 | |
duke@435 | 804 | // add mappings for PT_LOAD segments |
duke@435 | 805 | case PT_LOAD: { |
duke@435 | 806 | // add only non-writable segments of non-zero filesz |
duke@435 | 807 | if (!(exec_php->p_flags & PF_W) && exec_php->p_filesz != 0) { |
duke@435 | 808 | if (add_map_info(ph, ph->core->exec_fd, exec_php->p_offset, exec_php->p_vaddr, exec_php->p_filesz) == NULL) goto err; |
duke@435 | 809 | } |
duke@435 | 810 | break; |
duke@435 | 811 | } |
duke@435 | 812 | |
duke@435 | 813 | // read the interpreter and it's segments |
duke@435 | 814 | case PT_INTERP: { |
duke@435 | 815 | char interp_name[BUF_SIZE]; |
duke@435 | 816 | |
duke@435 | 817 | pread(ph->core->exec_fd, interp_name, MIN(exec_php->p_filesz, BUF_SIZE), exec_php->p_offset); |
duke@435 | 818 | print_debug("ELF interpreter %s\n", interp_name); |
duke@435 | 819 | // read interpreter segments as well |
duke@435 | 820 | if ((ph->core->interp_fd = pathmap_open(interp_name)) < 0) { |
duke@435 | 821 | print_debug("can't open runtime loader\n"); |
duke@435 | 822 | goto err; |
duke@435 | 823 | } |
duke@435 | 824 | break; |
duke@435 | 825 | } |
duke@435 | 826 | |
duke@435 | 827 | // from PT_DYNAMIC we want to read address of first link_map addr |
duke@435 | 828 | case PT_DYNAMIC: { |
duke@435 | 829 | ph->core->dynamic_addr = exec_php->p_vaddr; |
duke@435 | 830 | print_debug("address of _DYNAMIC is 0x%lx\n", ph->core->dynamic_addr); |
duke@435 | 831 | break; |
duke@435 | 832 | } |
duke@435 | 833 | |
duke@435 | 834 | } // switch |
duke@435 | 835 | exec_php++; |
duke@435 | 836 | } // for |
duke@435 | 837 | |
duke@435 | 838 | free(phbuf); |
duke@435 | 839 | return true; |
duke@435 | 840 | err: |
duke@435 | 841 | free(phbuf); |
duke@435 | 842 | return false; |
duke@435 | 843 | } |
duke@435 | 844 | |
duke@435 | 845 | |
duke@435 | 846 | #define FIRST_LINK_MAP_OFFSET offsetof(struct r_debug, r_map) |
duke@435 | 847 | #define LD_BASE_OFFSET offsetof(struct r_debug, r_ldbase) |
duke@435 | 848 | #define LINK_MAP_ADDR_OFFSET offsetof(struct link_map, l_addr) |
duke@435 | 849 | #define LINK_MAP_NAME_OFFSET offsetof(struct link_map, l_name) |
duke@435 | 850 | #define LINK_MAP_NEXT_OFFSET offsetof(struct link_map, l_next) |
duke@435 | 851 | |
duke@435 | 852 | // read shared library info from runtime linker's data structures. |
duke@435 | 853 | // This work is done by librtlb_db in Solaris |
duke@435 | 854 | static bool read_shared_lib_info(struct ps_prochandle* ph) { |
dsamersoff@5832 | 855 | uintptr_t addr = ph->core->dynamic_addr; |
dsamersoff@5832 | 856 | uintptr_t debug_base; |
dsamersoff@5832 | 857 | uintptr_t first_link_map_addr; |
dsamersoff@5832 | 858 | uintptr_t ld_base_addr; |
dsamersoff@5832 | 859 | uintptr_t link_map_addr; |
dsamersoff@5832 | 860 | uintptr_t lib_base_diff; |
dsamersoff@5832 | 861 | uintptr_t lib_base; |
dsamersoff@5832 | 862 | uintptr_t lib_name_addr; |
dsamersoff@5832 | 863 | char lib_name[BUF_SIZE]; |
dsamersoff@5832 | 864 | ELF_DYN dyn; |
dsamersoff@5832 | 865 | ELF_EHDR elf_ehdr; |
dsamersoff@5832 | 866 | int lib_fd; |
duke@435 | 867 | |
dsamersoff@5832 | 868 | // _DYNAMIC has information of the form |
dsamersoff@5832 | 869 | // [tag] [data] [tag] [data] ..... |
dsamersoff@5832 | 870 | // Both tag and data are pointer sized. |
dsamersoff@5832 | 871 | // We look for dynamic info with DT_DEBUG. This has shared object info. |
dsamersoff@5832 | 872 | // refer to struct r_debug in link.h |
duke@435 | 873 | |
dsamersoff@5832 | 874 | dyn.d_tag = DT_NULL; |
dsamersoff@5832 | 875 | while (dyn.d_tag != DT_DEBUG) { |
dsamersoff@5832 | 876 | if (ps_pdread(ph, (psaddr_t) addr, &dyn, sizeof(ELF_DYN)) != PS_OK) { |
dsamersoff@5832 | 877 | print_debug("can't read debug info from _DYNAMIC\n"); |
dsamersoff@5832 | 878 | return false; |
dsamersoff@5832 | 879 | } |
dsamersoff@5832 | 880 | addr += sizeof(ELF_DYN); |
dsamersoff@5832 | 881 | } |
duke@435 | 882 | |
dsamersoff@5832 | 883 | // we have got Dyn entry with DT_DEBUG |
dsamersoff@5832 | 884 | debug_base = dyn.d_un.d_ptr; |
dsamersoff@5832 | 885 | // at debug_base we have struct r_debug. This has first link map in r_map field |
dsamersoff@5832 | 886 | if (ps_pdread(ph, (psaddr_t) debug_base + FIRST_LINK_MAP_OFFSET, |
duke@435 | 887 | &first_link_map_addr, sizeof(uintptr_t)) != PS_OK) { |
dsamersoff@5832 | 888 | print_debug("can't read first link map address\n"); |
dsamersoff@5832 | 889 | return false; |
dsamersoff@5832 | 890 | } |
dsamersoff@5832 | 891 | |
dsamersoff@5832 | 892 | // read ld_base address from struct r_debug |
dsamersoff@5832 | 893 | if (ps_pdread(ph, (psaddr_t) debug_base + LD_BASE_OFFSET, &ld_base_addr, |
dsamersoff@5832 | 894 | sizeof(uintptr_t)) != PS_OK) { |
dsamersoff@5832 | 895 | print_debug("can't read ld base address\n"); |
dsamersoff@5832 | 896 | return false; |
dsamersoff@5832 | 897 | } |
dsamersoff@5832 | 898 | ph->core->ld_base_addr = ld_base_addr; |
dsamersoff@5832 | 899 | |
dsamersoff@5832 | 900 | print_debug("interpreter base address is 0x%lx\n", ld_base_addr); |
dsamersoff@5832 | 901 | |
dsamersoff@5832 | 902 | // now read segments from interp (i.e ld.so or ld-linux.so or ld-elf.so) |
dsamersoff@5832 | 903 | if (read_interp_segments(ph) != true) { |
duke@435 | 904 | return false; |
dsamersoff@5832 | 905 | } |
duke@435 | 906 | |
dsamersoff@5832 | 907 | // after adding interpreter (ld.so) mappings sort again |
dsamersoff@5832 | 908 | if (sort_map_array(ph) != true) { |
dsamersoff@5832 | 909 | return false; |
dsamersoff@5832 | 910 | } |
duke@435 | 911 | |
duke@435 | 912 | print_debug("first link map is at 0x%lx\n", first_link_map_addr); |
duke@435 | 913 | |
duke@435 | 914 | link_map_addr = first_link_map_addr; |
duke@435 | 915 | while (link_map_addr != 0) { |
duke@435 | 916 | // read library base address of the .so. Note that even though <sys/link.h> calls |
duke@435 | 917 | // link_map->l_addr as "base address", this is * not * really base virtual |
duke@435 | 918 | // address of the shared object. This is actually the difference b/w the virtual |
duke@435 | 919 | // address mentioned in shared object and the actual virtual base where runtime |
duke@435 | 920 | // linker loaded it. We use "base diff" in read_lib_segments call below. |
duke@435 | 921 | |
duke@435 | 922 | if (ps_pdread(ph, (psaddr_t) link_map_addr + LINK_MAP_ADDR_OFFSET, |
duke@435 | 923 | &lib_base_diff, sizeof(uintptr_t)) != PS_OK) { |
duke@435 | 924 | print_debug("can't read shared object base address diff\n"); |
duke@435 | 925 | return false; |
duke@435 | 926 | } |
duke@435 | 927 | |
duke@435 | 928 | // read address of the name |
duke@435 | 929 | if (ps_pdread(ph, (psaddr_t) link_map_addr + LINK_MAP_NAME_OFFSET, |
duke@435 | 930 | &lib_name_addr, sizeof(uintptr_t)) != PS_OK) { |
duke@435 | 931 | print_debug("can't read address of shared object name\n"); |
duke@435 | 932 | return false; |
duke@435 | 933 | } |
duke@435 | 934 | |
duke@435 | 935 | // read name of the shared object |
never@1820 | 936 | lib_name[0] = '\0'; |
never@1820 | 937 | if (lib_name_addr != 0 && |
never@1820 | 938 | read_string(ph, (uintptr_t) lib_name_addr, lib_name, sizeof(lib_name)) != true) { |
duke@435 | 939 | print_debug("can't read shared object name\n"); |
never@1820 | 940 | // don't let failure to read the name stop opening the file. If something is really wrong |
never@1820 | 941 | // it will fail later. |
duke@435 | 942 | } |
duke@435 | 943 | |
duke@435 | 944 | if (lib_name[0] != '\0') { |
duke@435 | 945 | // ignore empty lib names |
duke@435 | 946 | lib_fd = pathmap_open(lib_name); |
duke@435 | 947 | |
duke@435 | 948 | if (lib_fd < 0) { |
duke@435 | 949 | print_debug("can't open shared object %s\n", lib_name); |
duke@435 | 950 | // continue with other libraries... |
duke@435 | 951 | } else { |
duke@435 | 952 | if (read_elf_header(lib_fd, &elf_ehdr)) { |
duke@435 | 953 | lib_base = lib_base_diff + find_base_address(lib_fd, &elf_ehdr); |
duke@435 | 954 | print_debug("reading library %s @ 0x%lx [ 0x%lx ]\n", |
duke@435 | 955 | lib_name, lib_base, lib_base_diff); |
duke@435 | 956 | // while adding library mappings we need to use "base difference". |
duke@435 | 957 | if (! read_lib_segments(ph, lib_fd, &elf_ehdr, lib_base_diff)) { |
duke@435 | 958 | print_debug("can't read shared object's segments\n"); |
duke@435 | 959 | close(lib_fd); |
duke@435 | 960 | return false; |
duke@435 | 961 | } |
duke@435 | 962 | add_lib_info_fd(ph, lib_name, lib_fd, lib_base); |
duke@435 | 963 | // Map info is added for the library (lib_name) so |
duke@435 | 964 | // we need to re-sort it before calling the p_pdread. |
duke@435 | 965 | if (sort_map_array(ph) != true) |
duke@435 | 966 | return false; |
duke@435 | 967 | } else { |
duke@435 | 968 | print_debug("can't read ELF header for shared object %s\n", lib_name); |
duke@435 | 969 | close(lib_fd); |
duke@435 | 970 | // continue with other libraries... |
duke@435 | 971 | } |
duke@435 | 972 | } |
duke@435 | 973 | } |
duke@435 | 974 | |
dsamersoff@5832 | 975 | // read next link_map address |
dsamersoff@5832 | 976 | if (ps_pdread(ph, (psaddr_t) link_map_addr + LINK_MAP_NEXT_OFFSET, |
dsamersoff@5832 | 977 | &link_map_addr, sizeof(uintptr_t)) != PS_OK) { |
dsamersoff@5832 | 978 | print_debug("can't read next link in link_map\n"); |
dsamersoff@5832 | 979 | return false; |
dsamersoff@5832 | 980 | } |
dsamersoff@5832 | 981 | } |
duke@435 | 982 | |
dsamersoff@5832 | 983 | return true; |
duke@435 | 984 | } |
duke@435 | 985 | |
duke@435 | 986 | // the one and only one exposed stuff from this file |
duke@435 | 987 | struct ps_prochandle* Pgrab_core(const char* exec_file, const char* core_file) { |
dsamersoff@5832 | 988 | ELF_EHDR core_ehdr; |
dsamersoff@5832 | 989 | ELF_EHDR exec_ehdr; |
dsamersoff@5832 | 990 | ELF_EHDR lib_ehdr; |
duke@435 | 991 | |
dsamersoff@5832 | 992 | struct ps_prochandle* ph = (struct ps_prochandle*) calloc(1, sizeof(struct ps_prochandle)); |
dsamersoff@5832 | 993 | if (ph == NULL) { |
dsamersoff@5832 | 994 | print_debug("can't allocate ps_prochandle\n"); |
dsamersoff@5832 | 995 | return NULL; |
dsamersoff@5832 | 996 | } |
duke@435 | 997 | |
dsamersoff@5832 | 998 | if ((ph->core = (struct core_data*) calloc(1, sizeof(struct core_data))) == NULL) { |
dsamersoff@5832 | 999 | free(ph); |
dsamersoff@5832 | 1000 | print_debug("can't allocate ps_prochandle\n"); |
dsamersoff@5832 | 1001 | return NULL; |
dsamersoff@5832 | 1002 | } |
duke@435 | 1003 | |
dsamersoff@5832 | 1004 | // initialize ph |
dsamersoff@5832 | 1005 | ph->ops = &core_ops; |
dsamersoff@5832 | 1006 | ph->core->core_fd = -1; |
dsamersoff@5832 | 1007 | ph->core->exec_fd = -1; |
dsamersoff@5832 | 1008 | ph->core->interp_fd = -1; |
duke@435 | 1009 | |
dsamersoff@5832 | 1010 | // open the core file |
dsamersoff@5832 | 1011 | if ((ph->core->core_fd = open(core_file, O_RDONLY)) < 0) { |
dsamersoff@5832 | 1012 | print_debug("can't open core file\n"); |
dsamersoff@5832 | 1013 | goto err; |
dsamersoff@5832 | 1014 | } |
duke@435 | 1015 | |
dsamersoff@5832 | 1016 | // read core file ELF header |
dsamersoff@5832 | 1017 | if (read_elf_header(ph->core->core_fd, &core_ehdr) != true || core_ehdr.e_type != ET_CORE) { |
dsamersoff@5832 | 1018 | print_debug("core file is not a valid ELF ET_CORE file\n"); |
dsamersoff@5832 | 1019 | goto err; |
dsamersoff@5832 | 1020 | } |
duke@435 | 1021 | |
dsamersoff@5832 | 1022 | if ((ph->core->exec_fd = open(exec_file, O_RDONLY)) < 0) { |
dsamersoff@5832 | 1023 | print_debug("can't open executable file\n"); |
dsamersoff@5832 | 1024 | goto err; |
dsamersoff@5832 | 1025 | } |
duke@435 | 1026 | |
dsamersoff@5832 | 1027 | if (read_elf_header(ph->core->exec_fd, &exec_ehdr) != true || exec_ehdr.e_type != ET_EXEC) { |
dsamersoff@5832 | 1028 | print_debug("executable file is not a valid ELF ET_EXEC file\n"); |
dsamersoff@5832 | 1029 | goto err; |
dsamersoff@5832 | 1030 | } |
duke@435 | 1031 | |
dsamersoff@5832 | 1032 | // process core file segments |
dsamersoff@5832 | 1033 | if (read_core_segments(ph, &core_ehdr) != true) { |
dsamersoff@5832 | 1034 | goto err; |
dsamersoff@5832 | 1035 | } |
duke@435 | 1036 | |
dsamersoff@5832 | 1037 | // process exec file segments |
dsamersoff@5832 | 1038 | if (read_exec_segments(ph, &exec_ehdr) != true) { |
dsamersoff@5832 | 1039 | goto err; |
dsamersoff@5832 | 1040 | } |
duke@435 | 1041 | |
dsamersoff@5832 | 1042 | // exec file is also treated like a shared object for symbol search |
dsamersoff@5832 | 1043 | if (add_lib_info_fd(ph, exec_file, ph->core->exec_fd, |
dsamersoff@5832 | 1044 | (uintptr_t)0 + find_base_address(ph->core->exec_fd, &exec_ehdr)) == NULL) { |
dsamersoff@5832 | 1045 | goto err; |
dsamersoff@5832 | 1046 | } |
duke@435 | 1047 | |
dsamersoff@5832 | 1048 | // allocate and sort maps into map_array, we need to do this |
dsamersoff@5832 | 1049 | // here because read_shared_lib_info needs to read from debuggee |
dsamersoff@5832 | 1050 | // address space |
dsamersoff@5832 | 1051 | if (sort_map_array(ph) != true) { |
dsamersoff@5832 | 1052 | goto err; |
dsamersoff@5832 | 1053 | } |
duke@435 | 1054 | |
dsamersoff@5832 | 1055 | if (read_shared_lib_info(ph) != true) { |
dsamersoff@5832 | 1056 | goto err; |
dsamersoff@5832 | 1057 | } |
duke@435 | 1058 | |
dsamersoff@5832 | 1059 | // sort again because we have added more mappings from shared objects |
dsamersoff@5832 | 1060 | if (sort_map_array(ph) != true) { |
dsamersoff@5832 | 1061 | goto err; |
dsamersoff@5832 | 1062 | } |
duke@435 | 1063 | |
dsamersoff@5832 | 1064 | if (init_classsharing_workaround(ph) != true) { |
dsamersoff@5832 | 1065 | goto err; |
dsamersoff@5832 | 1066 | } |
duke@435 | 1067 | |
dsamersoff@5832 | 1068 | return ph; |
duke@435 | 1069 | |
duke@435 | 1070 | err: |
dsamersoff@5832 | 1071 | Prelease(ph); |
dsamersoff@5832 | 1072 | return NULL; |
duke@435 | 1073 | } |