| 1 | /* Core dump and executable file functions below target vector, for GDB. |
| 2 | |
| 3 | Copyright (C) 1986-2019 Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of GDB. |
| 6 | |
| 7 | This program is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 3 of the License, or |
| 10 | (at your option) any later version. |
| 11 | |
| 12 | This program is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 19 | |
| 20 | #include "defs.h" |
| 21 | #include "arch-utils.h" |
| 22 | #include <signal.h> |
| 23 | #include <fcntl.h> |
| 24 | #include "frame.h" /* required by inferior.h */ |
| 25 | #include "inferior.h" |
| 26 | #include "infrun.h" |
| 27 | #include "symtab.h" |
| 28 | #include "command.h" |
| 29 | #include "bfd.h" |
| 30 | #include "target.h" |
| 31 | #include "process-stratum-target.h" |
| 32 | #include "gdbcore.h" |
| 33 | #include "gdbthread.h" |
| 34 | #include "regcache.h" |
| 35 | #include "regset.h" |
| 36 | #include "symfile.h" |
| 37 | #include "exec.h" |
| 38 | #include "readline/readline.h" |
| 39 | #include "solib.h" |
| 40 | #include "filenames.h" |
| 41 | #include "progspace.h" |
| 42 | #include "objfiles.h" |
| 43 | #include "gdb_bfd.h" |
| 44 | #include "completer.h" |
| 45 | #include "gdbsupport/filestuff.h" |
| 46 | |
| 47 | #ifndef O_LARGEFILE |
| 48 | #define O_LARGEFILE 0 |
| 49 | #endif |
| 50 | |
| 51 | static core_fns *sniff_core_bfd (gdbarch *core_gdbarch, |
| 52 | bfd *abfd); |
| 53 | |
| 54 | /* The core file target. */ |
| 55 | |
| 56 | static const target_info core_target_info = { |
| 57 | "core", |
| 58 | N_("Local core dump file"), |
| 59 | N_("Use a core file as a target.\n\ |
| 60 | Specify the filename of the core file.") |
| 61 | }; |
| 62 | |
| 63 | class core_target final : public process_stratum_target |
| 64 | { |
| 65 | public: |
| 66 | core_target (); |
| 67 | ~core_target () override; |
| 68 | |
| 69 | const target_info &info () const override |
| 70 | { return core_target_info; } |
| 71 | |
| 72 | void close () override; |
| 73 | void detach (inferior *, int) override; |
| 74 | void fetch_registers (struct regcache *, int) override; |
| 75 | |
| 76 | enum target_xfer_status xfer_partial (enum target_object object, |
| 77 | const char *annex, |
| 78 | gdb_byte *readbuf, |
| 79 | const gdb_byte *writebuf, |
| 80 | ULONGEST offset, ULONGEST len, |
| 81 | ULONGEST *xfered_len) override; |
| 82 | void files_info () override; |
| 83 | |
| 84 | bool thread_alive (ptid_t ptid) override; |
| 85 | const struct target_desc *read_description () override; |
| 86 | |
| 87 | std::string pid_to_str (ptid_t) override; |
| 88 | |
| 89 | const char *thread_name (struct thread_info *) override; |
| 90 | |
| 91 | bool has_all_memory () override { return false; } |
| 92 | bool has_memory () override; |
| 93 | bool has_stack () override; |
| 94 | bool has_registers () override; |
| 95 | bool has_execution (ptid_t) override { return false; } |
| 96 | |
| 97 | bool info_proc (const char *, enum info_proc_what) override; |
| 98 | |
| 99 | /* A few helpers. */ |
| 100 | |
| 101 | /* Getter, see variable definition. */ |
| 102 | struct gdbarch *core_gdbarch () |
| 103 | { |
| 104 | return m_core_gdbarch; |
| 105 | } |
| 106 | |
| 107 | /* See definition. */ |
| 108 | void get_core_register_section (struct regcache *regcache, |
| 109 | const struct regset *regset, |
| 110 | const char *name, |
| 111 | int section_min_size, |
| 112 | int which, |
| 113 | const char *human_name, |
| 114 | bool required); |
| 115 | |
| 116 | private: /* per-core data */ |
| 117 | |
| 118 | /* The core's section table. Note that these target sections are |
| 119 | *not* mapped in the current address spaces' set of target |
| 120 | sections --- those should come only from pure executable or |
| 121 | shared library bfds. The core bfd sections are an implementation |
| 122 | detail of the core target, just like ptrace is for unix child |
| 123 | targets. */ |
| 124 | target_section_table m_core_section_table {}; |
| 125 | |
| 126 | /* The core_fns for a core file handler that is prepared to read the |
| 127 | core file currently open on core_bfd. */ |
| 128 | core_fns *m_core_vec = NULL; |
| 129 | |
| 130 | /* FIXME: kettenis/20031023: Eventually this field should |
| 131 | disappear. */ |
| 132 | struct gdbarch *m_core_gdbarch = NULL; |
| 133 | }; |
| 134 | |
| 135 | core_target::core_target () |
| 136 | { |
| 137 | m_core_gdbarch = gdbarch_from_bfd (core_bfd); |
| 138 | |
| 139 | /* Find a suitable core file handler to munch on core_bfd */ |
| 140 | m_core_vec = sniff_core_bfd (m_core_gdbarch, core_bfd); |
| 141 | |
| 142 | /* Find the data section */ |
| 143 | if (build_section_table (core_bfd, |
| 144 | &m_core_section_table.sections, |
| 145 | &m_core_section_table.sections_end)) |
| 146 | error (_("\"%s\": Can't find sections: %s"), |
| 147 | bfd_get_filename (core_bfd), bfd_errmsg (bfd_get_error ())); |
| 148 | } |
| 149 | |
| 150 | core_target::~core_target () |
| 151 | { |
| 152 | xfree (m_core_section_table.sections); |
| 153 | } |
| 154 | |
| 155 | /* List of all available core_fns. On gdb startup, each core file |
| 156 | register reader calls deprecated_add_core_fns() to register |
| 157 | information on each core format it is prepared to read. */ |
| 158 | |
| 159 | static struct core_fns *core_file_fns = NULL; |
| 160 | |
| 161 | static int gdb_check_format (bfd *); |
| 162 | |
| 163 | static void add_to_thread_list (bfd *, asection *, void *); |
| 164 | |
| 165 | /* An arbitrary identifier for the core inferior. */ |
| 166 | #define CORELOW_PID 1 |
| 167 | |
| 168 | /* Link a new core_fns into the global core_file_fns list. Called on |
| 169 | gdb startup by the _initialize routine in each core file register |
| 170 | reader, to register information about each format the reader is |
| 171 | prepared to handle. */ |
| 172 | |
| 173 | void |
| 174 | deprecated_add_core_fns (struct core_fns *cf) |
| 175 | { |
| 176 | cf->next = core_file_fns; |
| 177 | core_file_fns = cf; |
| 178 | } |
| 179 | |
| 180 | /* The default function that core file handlers can use to examine a |
| 181 | core file BFD and decide whether or not to accept the job of |
| 182 | reading the core file. */ |
| 183 | |
| 184 | int |
| 185 | default_core_sniffer (struct core_fns *our_fns, bfd *abfd) |
| 186 | { |
| 187 | int result; |
| 188 | |
| 189 | result = (bfd_get_flavour (abfd) == our_fns -> core_flavour); |
| 190 | return (result); |
| 191 | } |
| 192 | |
| 193 | /* Walk through the list of core functions to find a set that can |
| 194 | handle the core file open on ABFD. Returns pointer to set that is |
| 195 | selected. */ |
| 196 | |
| 197 | static struct core_fns * |
| 198 | sniff_core_bfd (struct gdbarch *core_gdbarch, bfd *abfd) |
| 199 | { |
| 200 | struct core_fns *cf; |
| 201 | struct core_fns *yummy = NULL; |
| 202 | int matches = 0; |
| 203 | |
| 204 | /* Don't sniff if we have support for register sets in |
| 205 | CORE_GDBARCH. */ |
| 206 | if (core_gdbarch && gdbarch_iterate_over_regset_sections_p (core_gdbarch)) |
| 207 | return NULL; |
| 208 | |
| 209 | for (cf = core_file_fns; cf != NULL; cf = cf->next) |
| 210 | { |
| 211 | if (cf->core_sniffer (cf, abfd)) |
| 212 | { |
| 213 | yummy = cf; |
| 214 | matches++; |
| 215 | } |
| 216 | } |
| 217 | if (matches > 1) |
| 218 | { |
| 219 | warning (_("\"%s\": ambiguous core format, %d handlers match"), |
| 220 | bfd_get_filename (abfd), matches); |
| 221 | } |
| 222 | else if (matches == 0) |
| 223 | error (_("\"%s\": no core file handler recognizes format"), |
| 224 | bfd_get_filename (abfd)); |
| 225 | |
| 226 | return (yummy); |
| 227 | } |
| 228 | |
| 229 | /* The default is to reject every core file format we see. Either |
| 230 | BFD has to recognize it, or we have to provide a function in the |
| 231 | core file handler that recognizes it. */ |
| 232 | |
| 233 | int |
| 234 | default_check_format (bfd *abfd) |
| 235 | { |
| 236 | return (0); |
| 237 | } |
| 238 | |
| 239 | /* Attempt to recognize core file formats that BFD rejects. */ |
| 240 | |
| 241 | static int |
| 242 | gdb_check_format (bfd *abfd) |
| 243 | { |
| 244 | struct core_fns *cf; |
| 245 | |
| 246 | for (cf = core_file_fns; cf != NULL; cf = cf->next) |
| 247 | { |
| 248 | if (cf->check_format (abfd)) |
| 249 | { |
| 250 | return (1); |
| 251 | } |
| 252 | } |
| 253 | return (0); |
| 254 | } |
| 255 | |
| 256 | /* Close the core target. */ |
| 257 | |
| 258 | void |
| 259 | core_target::close () |
| 260 | { |
| 261 | if (core_bfd) |
| 262 | { |
| 263 | inferior_ptid = null_ptid; /* Avoid confusion from thread |
| 264 | stuff. */ |
| 265 | exit_inferior_silent (current_inferior ()); |
| 266 | |
| 267 | /* Clear out solib state while the bfd is still open. See |
| 268 | comments in clear_solib in solib.c. */ |
| 269 | clear_solib (); |
| 270 | |
| 271 | current_program_space->cbfd.reset (nullptr); |
| 272 | } |
| 273 | |
| 274 | /* Core targets are heap-allocated (see core_target_open), so here |
| 275 | we delete ourselves. */ |
| 276 | delete this; |
| 277 | } |
| 278 | |
| 279 | /* Look for sections whose names start with `.reg/' so that we can |
| 280 | extract the list of threads in a core file. */ |
| 281 | |
| 282 | static void |
| 283 | add_to_thread_list (bfd *abfd, asection *asect, void *reg_sect_arg) |
| 284 | { |
| 285 | ptid_t ptid; |
| 286 | int core_tid; |
| 287 | int pid, lwpid; |
| 288 | asection *reg_sect = (asection *) reg_sect_arg; |
| 289 | bool fake_pid_p = false; |
| 290 | struct inferior *inf; |
| 291 | |
| 292 | if (!startswith (bfd_section_name (asect), ".reg/")) |
| 293 | return; |
| 294 | |
| 295 | core_tid = atoi (bfd_section_name (asect) + 5); |
| 296 | |
| 297 | pid = bfd_core_file_pid (core_bfd); |
| 298 | if (pid == 0) |
| 299 | { |
| 300 | fake_pid_p = true; |
| 301 | pid = CORELOW_PID; |
| 302 | } |
| 303 | |
| 304 | lwpid = core_tid; |
| 305 | |
| 306 | inf = current_inferior (); |
| 307 | if (inf->pid == 0) |
| 308 | { |
| 309 | inferior_appeared (inf, pid); |
| 310 | inf->fake_pid_p = fake_pid_p; |
| 311 | } |
| 312 | |
| 313 | ptid = ptid_t (pid, lwpid, 0); |
| 314 | |
| 315 | add_thread (ptid); |
| 316 | |
| 317 | /* Warning, Will Robinson, looking at BFD private data! */ |
| 318 | |
| 319 | if (reg_sect != NULL |
| 320 | && asect->filepos == reg_sect->filepos) /* Did we find .reg? */ |
| 321 | inferior_ptid = ptid; /* Yes, make it current. */ |
| 322 | } |
| 323 | |
| 324 | /* Issue a message saying we have no core to debug, if FROM_TTY. */ |
| 325 | |
| 326 | static void |
| 327 | maybe_say_no_core_file_now (int from_tty) |
| 328 | { |
| 329 | if (from_tty) |
| 330 | printf_filtered (_("No core file now.\n")); |
| 331 | } |
| 332 | |
| 333 | /* Backward compatability with old way of specifying core files. */ |
| 334 | |
| 335 | void |
| 336 | core_file_command (const char *filename, int from_tty) |
| 337 | { |
| 338 | dont_repeat (); /* Either way, seems bogus. */ |
| 339 | |
| 340 | if (filename == NULL) |
| 341 | { |
| 342 | if (core_bfd != NULL) |
| 343 | { |
| 344 | target_detach (current_inferior (), from_tty); |
| 345 | gdb_assert (core_bfd == NULL); |
| 346 | } |
| 347 | else |
| 348 | maybe_say_no_core_file_now (from_tty); |
| 349 | } |
| 350 | else |
| 351 | core_target_open (filename, from_tty); |
| 352 | } |
| 353 | |
| 354 | /* See gdbcore.h. */ |
| 355 | |
| 356 | void |
| 357 | core_target_open (const char *arg, int from_tty) |
| 358 | { |
| 359 | const char *p; |
| 360 | int siggy; |
| 361 | int scratch_chan; |
| 362 | int flags; |
| 363 | |
| 364 | target_preopen (from_tty); |
| 365 | if (!arg) |
| 366 | { |
| 367 | if (core_bfd) |
| 368 | error (_("No core file specified. (Use `detach' " |
| 369 | "to stop debugging a core file.)")); |
| 370 | else |
| 371 | error (_("No core file specified.")); |
| 372 | } |
| 373 | |
| 374 | gdb::unique_xmalloc_ptr<char> filename (tilde_expand (arg)); |
| 375 | if (!IS_ABSOLUTE_PATH (filename.get ())) |
| 376 | filename.reset (concat (current_directory, "/", |
| 377 | filename.get (), (char *) NULL)); |
| 378 | |
| 379 | flags = O_BINARY | O_LARGEFILE; |
| 380 | if (write_files) |
| 381 | flags |= O_RDWR; |
| 382 | else |
| 383 | flags |= O_RDONLY; |
| 384 | scratch_chan = gdb_open_cloexec (filename.get (), flags, 0); |
| 385 | if (scratch_chan < 0) |
| 386 | perror_with_name (filename.get ()); |
| 387 | |
| 388 | gdb_bfd_ref_ptr temp_bfd (gdb_bfd_fopen (filename.get (), gnutarget, |
| 389 | write_files ? FOPEN_RUB : FOPEN_RB, |
| 390 | scratch_chan)); |
| 391 | if (temp_bfd == NULL) |
| 392 | perror_with_name (filename.get ()); |
| 393 | |
| 394 | if (!bfd_check_format (temp_bfd.get (), bfd_core) |
| 395 | && !gdb_check_format (temp_bfd.get ())) |
| 396 | { |
| 397 | /* Do it after the err msg */ |
| 398 | /* FIXME: should be checking for errors from bfd_close (for one |
| 399 | thing, on error it does not free all the storage associated |
| 400 | with the bfd). */ |
| 401 | error (_("\"%s\" is not a core dump: %s"), |
| 402 | filename.get (), bfd_errmsg (bfd_get_error ())); |
| 403 | } |
| 404 | |
| 405 | current_program_space->cbfd = std::move (temp_bfd); |
| 406 | |
| 407 | core_target *target = new core_target (); |
| 408 | |
| 409 | /* Own the target until it is successfully pushed. */ |
| 410 | target_ops_up target_holder (target); |
| 411 | |
| 412 | validate_files (); |
| 413 | |
| 414 | /* If we have no exec file, try to set the architecture from the |
| 415 | core file. We don't do this unconditionally since an exec file |
| 416 | typically contains more information that helps us determine the |
| 417 | architecture than a core file. */ |
| 418 | if (!exec_bfd) |
| 419 | set_gdbarch_from_file (core_bfd); |
| 420 | |
| 421 | push_target (std::move (target_holder)); |
| 422 | |
| 423 | inferior_ptid = null_ptid; |
| 424 | |
| 425 | /* Need to flush the register cache (and the frame cache) from a |
| 426 | previous debug session. If inferior_ptid ends up the same as the |
| 427 | last debug session --- e.g., b foo; run; gcore core1; step; gcore |
| 428 | core2; core core1; core core2 --- then there's potential for |
| 429 | get_current_regcache to return the cached regcache of the |
| 430 | previous session, and the frame cache being stale. */ |
| 431 | registers_changed (); |
| 432 | |
| 433 | /* Build up thread list from BFD sections, and possibly set the |
| 434 | current thread to the .reg/NN section matching the .reg |
| 435 | section. */ |
| 436 | bfd_map_over_sections (core_bfd, add_to_thread_list, |
| 437 | bfd_get_section_by_name (core_bfd, ".reg")); |
| 438 | |
| 439 | if (inferior_ptid == null_ptid) |
| 440 | { |
| 441 | /* Either we found no .reg/NN section, and hence we have a |
| 442 | non-threaded core (single-threaded, from gdb's perspective), |
| 443 | or for some reason add_to_thread_list couldn't determine |
| 444 | which was the "main" thread. The latter case shouldn't |
| 445 | usually happen, but we're dealing with input here, which can |
| 446 | always be broken in different ways. */ |
| 447 | thread_info *thread = first_thread_of_inferior (current_inferior ()); |
| 448 | |
| 449 | if (thread == NULL) |
| 450 | { |
| 451 | inferior_appeared (current_inferior (), CORELOW_PID); |
| 452 | inferior_ptid = ptid_t (CORELOW_PID); |
| 453 | add_thread_silent (inferior_ptid); |
| 454 | } |
| 455 | else |
| 456 | switch_to_thread (thread); |
| 457 | } |
| 458 | |
| 459 | post_create_inferior (target, from_tty); |
| 460 | |
| 461 | /* Now go through the target stack looking for threads since there |
| 462 | may be a thread_stratum target loaded on top of target core by |
| 463 | now. The layer above should claim threads found in the BFD |
| 464 | sections. */ |
| 465 | try |
| 466 | { |
| 467 | target_update_thread_list (); |
| 468 | } |
| 469 | |
| 470 | catch (const gdb_exception_error &except) |
| 471 | { |
| 472 | exception_print (gdb_stderr, except); |
| 473 | } |
| 474 | |
| 475 | p = bfd_core_file_failing_command (core_bfd); |
| 476 | if (p) |
| 477 | printf_filtered (_("Core was generated by `%s'.\n"), p); |
| 478 | |
| 479 | /* Clearing any previous state of convenience variables. */ |
| 480 | clear_exit_convenience_vars (); |
| 481 | |
| 482 | siggy = bfd_core_file_failing_signal (core_bfd); |
| 483 | if (siggy > 0) |
| 484 | { |
| 485 | gdbarch *core_gdbarch = target->core_gdbarch (); |
| 486 | |
| 487 | /* If we don't have a CORE_GDBARCH to work with, assume a native |
| 488 | core (map gdb_signal from host signals). If we do have |
| 489 | CORE_GDBARCH to work with, but no gdb_signal_from_target |
| 490 | implementation for that gdbarch, as a fallback measure, |
| 491 | assume the host signal mapping. It'll be correct for native |
| 492 | cores, but most likely incorrect for cross-cores. */ |
| 493 | enum gdb_signal sig = (core_gdbarch != NULL |
| 494 | && gdbarch_gdb_signal_from_target_p (core_gdbarch) |
| 495 | ? gdbarch_gdb_signal_from_target (core_gdbarch, |
| 496 | siggy) |
| 497 | : gdb_signal_from_host (siggy)); |
| 498 | |
| 499 | printf_filtered (_("Program terminated with signal %s, %s.\n"), |
| 500 | gdb_signal_to_name (sig), gdb_signal_to_string (sig)); |
| 501 | |
| 502 | /* Set the value of the internal variable $_exitsignal, |
| 503 | which holds the signal uncaught by the inferior. */ |
| 504 | set_internalvar_integer (lookup_internalvar ("_exitsignal"), |
| 505 | siggy); |
| 506 | } |
| 507 | |
| 508 | /* Fetch all registers from core file. */ |
| 509 | target_fetch_registers (get_current_regcache (), -1); |
| 510 | |
| 511 | /* Now, set up the frame cache, and print the top of stack. */ |
| 512 | reinit_frame_cache (); |
| 513 | print_stack_frame (get_selected_frame (NULL), 1, SRC_AND_LOC, 1); |
| 514 | |
| 515 | /* Current thread should be NUM 1 but the user does not know that. |
| 516 | If a program is single threaded gdb in general does not mention |
| 517 | anything about threads. That is why the test is >= 2. */ |
| 518 | if (thread_count () >= 2) |
| 519 | { |
| 520 | try |
| 521 | { |
| 522 | thread_command (NULL, from_tty); |
| 523 | } |
| 524 | catch (const gdb_exception_error &except) |
| 525 | { |
| 526 | exception_print (gdb_stderr, except); |
| 527 | } |
| 528 | } |
| 529 | } |
| 530 | |
| 531 | void |
| 532 | core_target::detach (inferior *inf, int from_tty) |
| 533 | { |
| 534 | /* Note that 'this' is dangling after this call. unpush_target |
| 535 | closes the target, and our close implementation deletes |
| 536 | 'this'. */ |
| 537 | unpush_target (this); |
| 538 | |
| 539 | /* Clear the register cache and the frame cache. */ |
| 540 | registers_changed (); |
| 541 | reinit_frame_cache (); |
| 542 | maybe_say_no_core_file_now (from_tty); |
| 543 | } |
| 544 | |
| 545 | /* Try to retrieve registers from a section in core_bfd, and supply |
| 546 | them to m_core_vec->core_read_registers, as the register set |
| 547 | numbered WHICH. |
| 548 | |
| 549 | If ptid's lwp member is zero, do the single-threaded |
| 550 | thing: look for a section named NAME. If ptid's lwp |
| 551 | member is non-zero, do the multi-threaded thing: look for a section |
| 552 | named "NAME/LWP", where LWP is the shortest ASCII decimal |
| 553 | representation of ptid's lwp member. |
| 554 | |
| 555 | HUMAN_NAME is a human-readable name for the kind of registers the |
| 556 | NAME section contains, for use in error messages. |
| 557 | |
| 558 | If REQUIRED is true, print an error if the core file doesn't have a |
| 559 | section by the appropriate name. Otherwise, just do nothing. */ |
| 560 | |
| 561 | void |
| 562 | core_target::get_core_register_section (struct regcache *regcache, |
| 563 | const struct regset *regset, |
| 564 | const char *name, |
| 565 | int section_min_size, |
| 566 | int which, |
| 567 | const char *human_name, |
| 568 | bool required) |
| 569 | { |
| 570 | struct bfd_section *section; |
| 571 | bfd_size_type size; |
| 572 | char *contents; |
| 573 | bool variable_size_section = (regset != NULL |
| 574 | && regset->flags & REGSET_VARIABLE_SIZE); |
| 575 | |
| 576 | thread_section_name section_name (name, regcache->ptid ()); |
| 577 | |
| 578 | section = bfd_get_section_by_name (core_bfd, section_name.c_str ()); |
| 579 | if (! section) |
| 580 | { |
| 581 | if (required) |
| 582 | warning (_("Couldn't find %s registers in core file."), |
| 583 | human_name); |
| 584 | return; |
| 585 | } |
| 586 | |
| 587 | size = bfd_section_size (section); |
| 588 | if (size < section_min_size) |
| 589 | { |
| 590 | warning (_("Section `%s' in core file too small."), |
| 591 | section_name.c_str ()); |
| 592 | return; |
| 593 | } |
| 594 | if (size != section_min_size && !variable_size_section) |
| 595 | { |
| 596 | warning (_("Unexpected size of section `%s' in core file."), |
| 597 | section_name.c_str ()); |
| 598 | } |
| 599 | |
| 600 | contents = (char *) alloca (size); |
| 601 | if (! bfd_get_section_contents (core_bfd, section, contents, |
| 602 | (file_ptr) 0, size)) |
| 603 | { |
| 604 | warning (_("Couldn't read %s registers from `%s' section in core file."), |
| 605 | human_name, section_name.c_str ()); |
| 606 | return; |
| 607 | } |
| 608 | |
| 609 | if (regset != NULL) |
| 610 | { |
| 611 | regset->supply_regset (regset, regcache, -1, contents, size); |
| 612 | return; |
| 613 | } |
| 614 | |
| 615 | gdb_assert (m_core_vec != nullptr); |
| 616 | m_core_vec->core_read_registers (regcache, contents, size, which, |
| 617 | (CORE_ADDR) bfd_section_vma (section)); |
| 618 | } |
| 619 | |
| 620 | /* Data passed to gdbarch_iterate_over_regset_sections's callback. */ |
| 621 | struct get_core_registers_cb_data |
| 622 | { |
| 623 | core_target *target; |
| 624 | struct regcache *regcache; |
| 625 | }; |
| 626 | |
| 627 | /* Callback for get_core_registers that handles a single core file |
| 628 | register note section. */ |
| 629 | |
| 630 | static void |
| 631 | get_core_registers_cb (const char *sect_name, int supply_size, int collect_size, |
| 632 | const struct regset *regset, |
| 633 | const char *human_name, void *cb_data) |
| 634 | { |
| 635 | auto *data = (get_core_registers_cb_data *) cb_data; |
| 636 | bool required = false; |
| 637 | bool variable_size_section = (regset != NULL |
| 638 | && regset->flags & REGSET_VARIABLE_SIZE); |
| 639 | |
| 640 | if (!variable_size_section) |
| 641 | gdb_assert (supply_size == collect_size); |
| 642 | |
| 643 | if (strcmp (sect_name, ".reg") == 0) |
| 644 | { |
| 645 | required = true; |
| 646 | if (human_name == NULL) |
| 647 | human_name = "general-purpose"; |
| 648 | } |
| 649 | else if (strcmp (sect_name, ".reg2") == 0) |
| 650 | { |
| 651 | if (human_name == NULL) |
| 652 | human_name = "floating-point"; |
| 653 | } |
| 654 | |
| 655 | /* The 'which' parameter is only used when no regset is provided. |
| 656 | Thus we just set it to -1. */ |
| 657 | data->target->get_core_register_section (data->regcache, regset, sect_name, |
| 658 | supply_size, -1, human_name, |
| 659 | required); |
| 660 | } |
| 661 | |
| 662 | /* Get the registers out of a core file. This is the machine- |
| 663 | independent part. Fetch_core_registers is the machine-dependent |
| 664 | part, typically implemented in the xm-file for each |
| 665 | architecture. */ |
| 666 | |
| 667 | /* We just get all the registers, so we don't use regno. */ |
| 668 | |
| 669 | void |
| 670 | core_target::fetch_registers (struct regcache *regcache, int regno) |
| 671 | { |
| 672 | int i; |
| 673 | struct gdbarch *gdbarch; |
| 674 | |
| 675 | if (!(m_core_gdbarch != nullptr |
| 676 | && gdbarch_iterate_over_regset_sections_p (m_core_gdbarch)) |
| 677 | && (m_core_vec == NULL || m_core_vec->core_read_registers == NULL)) |
| 678 | { |
| 679 | fprintf_filtered (gdb_stderr, |
| 680 | "Can't fetch registers from this type of core file\n"); |
| 681 | return; |
| 682 | } |
| 683 | |
| 684 | gdbarch = regcache->arch (); |
| 685 | if (gdbarch_iterate_over_regset_sections_p (gdbarch)) |
| 686 | { |
| 687 | get_core_registers_cb_data data = { this, regcache }; |
| 688 | gdbarch_iterate_over_regset_sections (gdbarch, |
| 689 | get_core_registers_cb, |
| 690 | (void *) &data, NULL); |
| 691 | } |
| 692 | else |
| 693 | { |
| 694 | get_core_register_section (regcache, NULL, |
| 695 | ".reg", 0, 0, "general-purpose", 1); |
| 696 | get_core_register_section (regcache, NULL, |
| 697 | ".reg2", 0, 2, "floating-point", 0); |
| 698 | } |
| 699 | |
| 700 | /* Mark all registers not found in the core as unavailable. */ |
| 701 | for (i = 0; i < gdbarch_num_regs (regcache->arch ()); i++) |
| 702 | if (regcache->get_register_status (i) == REG_UNKNOWN) |
| 703 | regcache->raw_supply (i, NULL); |
| 704 | } |
| 705 | |
| 706 | void |
| 707 | core_target::files_info () |
| 708 | { |
| 709 | print_section_info (&m_core_section_table, core_bfd); |
| 710 | } |
| 711 | \f |
| 712 | enum target_xfer_status |
| 713 | core_target::xfer_partial (enum target_object object, const char *annex, |
| 714 | gdb_byte *readbuf, const gdb_byte *writebuf, |
| 715 | ULONGEST offset, ULONGEST len, ULONGEST *xfered_len) |
| 716 | { |
| 717 | switch (object) |
| 718 | { |
| 719 | case TARGET_OBJECT_MEMORY: |
| 720 | return (section_table_xfer_memory_partial |
| 721 | (readbuf, writebuf, |
| 722 | offset, len, xfered_len, |
| 723 | m_core_section_table.sections, |
| 724 | m_core_section_table.sections_end, |
| 725 | NULL)); |
| 726 | |
| 727 | case TARGET_OBJECT_AUXV: |
| 728 | if (readbuf) |
| 729 | { |
| 730 | /* When the aux vector is stored in core file, BFD |
| 731 | represents this with a fake section called ".auxv". */ |
| 732 | |
| 733 | struct bfd_section *section; |
| 734 | bfd_size_type size; |
| 735 | |
| 736 | section = bfd_get_section_by_name (core_bfd, ".auxv"); |
| 737 | if (section == NULL) |
| 738 | return TARGET_XFER_E_IO; |
| 739 | |
| 740 | size = bfd_section_size (section); |
| 741 | if (offset >= size) |
| 742 | return TARGET_XFER_EOF; |
| 743 | size -= offset; |
| 744 | if (size > len) |
| 745 | size = len; |
| 746 | |
| 747 | if (size == 0) |
| 748 | return TARGET_XFER_EOF; |
| 749 | if (!bfd_get_section_contents (core_bfd, section, readbuf, |
| 750 | (file_ptr) offset, size)) |
| 751 | { |
| 752 | warning (_("Couldn't read NT_AUXV note in core file.")); |
| 753 | return TARGET_XFER_E_IO; |
| 754 | } |
| 755 | |
| 756 | *xfered_len = (ULONGEST) size; |
| 757 | return TARGET_XFER_OK; |
| 758 | } |
| 759 | return TARGET_XFER_E_IO; |
| 760 | |
| 761 | case TARGET_OBJECT_WCOOKIE: |
| 762 | if (readbuf) |
| 763 | { |
| 764 | /* When the StackGhost cookie is stored in core file, BFD |
| 765 | represents this with a fake section called |
| 766 | ".wcookie". */ |
| 767 | |
| 768 | struct bfd_section *section; |
| 769 | bfd_size_type size; |
| 770 | |
| 771 | section = bfd_get_section_by_name (core_bfd, ".wcookie"); |
| 772 | if (section == NULL) |
| 773 | return TARGET_XFER_E_IO; |
| 774 | |
| 775 | size = bfd_section_size (section); |
| 776 | if (offset >= size) |
| 777 | return TARGET_XFER_EOF; |
| 778 | size -= offset; |
| 779 | if (size > len) |
| 780 | size = len; |
| 781 | |
| 782 | if (size == 0) |
| 783 | return TARGET_XFER_EOF; |
| 784 | if (!bfd_get_section_contents (core_bfd, section, readbuf, |
| 785 | (file_ptr) offset, size)) |
| 786 | { |
| 787 | warning (_("Couldn't read StackGhost cookie in core file.")); |
| 788 | return TARGET_XFER_E_IO; |
| 789 | } |
| 790 | |
| 791 | *xfered_len = (ULONGEST) size; |
| 792 | return TARGET_XFER_OK; |
| 793 | |
| 794 | } |
| 795 | return TARGET_XFER_E_IO; |
| 796 | |
| 797 | case TARGET_OBJECT_LIBRARIES: |
| 798 | if (m_core_gdbarch != nullptr |
| 799 | && gdbarch_core_xfer_shared_libraries_p (m_core_gdbarch)) |
| 800 | { |
| 801 | if (writebuf) |
| 802 | return TARGET_XFER_E_IO; |
| 803 | else |
| 804 | { |
| 805 | *xfered_len = gdbarch_core_xfer_shared_libraries (m_core_gdbarch, |
| 806 | readbuf, |
| 807 | offset, len); |
| 808 | |
| 809 | if (*xfered_len == 0) |
| 810 | return TARGET_XFER_EOF; |
| 811 | else |
| 812 | return TARGET_XFER_OK; |
| 813 | } |
| 814 | } |
| 815 | /* FALL THROUGH */ |
| 816 | |
| 817 | case TARGET_OBJECT_LIBRARIES_AIX: |
| 818 | if (m_core_gdbarch != nullptr |
| 819 | && gdbarch_core_xfer_shared_libraries_aix_p (m_core_gdbarch)) |
| 820 | { |
| 821 | if (writebuf) |
| 822 | return TARGET_XFER_E_IO; |
| 823 | else |
| 824 | { |
| 825 | *xfered_len |
| 826 | = gdbarch_core_xfer_shared_libraries_aix (m_core_gdbarch, |
| 827 | readbuf, offset, |
| 828 | len); |
| 829 | |
| 830 | if (*xfered_len == 0) |
| 831 | return TARGET_XFER_EOF; |
| 832 | else |
| 833 | return TARGET_XFER_OK; |
| 834 | } |
| 835 | } |
| 836 | /* FALL THROUGH */ |
| 837 | |
| 838 | case TARGET_OBJECT_SIGNAL_INFO: |
| 839 | if (readbuf) |
| 840 | { |
| 841 | if (m_core_gdbarch != nullptr |
| 842 | && gdbarch_core_xfer_siginfo_p (m_core_gdbarch)) |
| 843 | { |
| 844 | LONGEST l = gdbarch_core_xfer_siginfo (m_core_gdbarch, readbuf, |
| 845 | offset, len); |
| 846 | |
| 847 | if (l >= 0) |
| 848 | { |
| 849 | *xfered_len = l; |
| 850 | if (l == 0) |
| 851 | return TARGET_XFER_EOF; |
| 852 | else |
| 853 | return TARGET_XFER_OK; |
| 854 | } |
| 855 | } |
| 856 | } |
| 857 | return TARGET_XFER_E_IO; |
| 858 | |
| 859 | default: |
| 860 | return this->beneath ()->xfer_partial (object, annex, readbuf, |
| 861 | writebuf, offset, len, |
| 862 | xfered_len); |
| 863 | } |
| 864 | } |
| 865 | |
| 866 | \f |
| 867 | |
| 868 | /* Okay, let's be honest: threads gleaned from a core file aren't |
| 869 | exactly lively, are they? On the other hand, if we don't claim |
| 870 | that each & every one is alive, then we don't get any of them |
| 871 | to appear in an "info thread" command, which is quite a useful |
| 872 | behaviour. |
| 873 | */ |
| 874 | bool |
| 875 | core_target::thread_alive (ptid_t ptid) |
| 876 | { |
| 877 | return true; |
| 878 | } |
| 879 | |
| 880 | /* Ask the current architecture what it knows about this core file. |
| 881 | That will be used, in turn, to pick a better architecture. This |
| 882 | wrapper could be avoided if targets got a chance to specialize |
| 883 | core_target. */ |
| 884 | |
| 885 | const struct target_desc * |
| 886 | core_target::read_description () |
| 887 | { |
| 888 | if (m_core_gdbarch && gdbarch_core_read_description_p (m_core_gdbarch)) |
| 889 | { |
| 890 | const struct target_desc *result; |
| 891 | |
| 892 | result = gdbarch_core_read_description (m_core_gdbarch, this, core_bfd); |
| 893 | if (result != NULL) |
| 894 | return result; |
| 895 | } |
| 896 | |
| 897 | return this->beneath ()->read_description (); |
| 898 | } |
| 899 | |
| 900 | std::string |
| 901 | core_target::pid_to_str (ptid_t ptid) |
| 902 | { |
| 903 | struct inferior *inf; |
| 904 | int pid; |
| 905 | |
| 906 | /* The preferred way is to have a gdbarch/OS specific |
| 907 | implementation. */ |
| 908 | if (m_core_gdbarch != nullptr |
| 909 | && gdbarch_core_pid_to_str_p (m_core_gdbarch)) |
| 910 | return gdbarch_core_pid_to_str (m_core_gdbarch, ptid); |
| 911 | |
| 912 | /* Otherwise, if we don't have one, we'll just fallback to |
| 913 | "process", with normal_pid_to_str. */ |
| 914 | |
| 915 | /* Try the LWPID field first. */ |
| 916 | pid = ptid.lwp (); |
| 917 | if (pid != 0) |
| 918 | return normal_pid_to_str (ptid_t (pid)); |
| 919 | |
| 920 | /* Otherwise, this isn't a "threaded" core -- use the PID field, but |
| 921 | only if it isn't a fake PID. */ |
| 922 | inf = find_inferior_ptid (ptid); |
| 923 | if (inf != NULL && !inf->fake_pid_p) |
| 924 | return normal_pid_to_str (ptid); |
| 925 | |
| 926 | /* No luck. We simply don't have a valid PID to print. */ |
| 927 | return "<main task>"; |
| 928 | } |
| 929 | |
| 930 | const char * |
| 931 | core_target::thread_name (struct thread_info *thr) |
| 932 | { |
| 933 | if (m_core_gdbarch != nullptr |
| 934 | && gdbarch_core_thread_name_p (m_core_gdbarch)) |
| 935 | return gdbarch_core_thread_name (m_core_gdbarch, thr); |
| 936 | return NULL; |
| 937 | } |
| 938 | |
| 939 | bool |
| 940 | core_target::has_memory () |
| 941 | { |
| 942 | return (core_bfd != NULL); |
| 943 | } |
| 944 | |
| 945 | bool |
| 946 | core_target::has_stack () |
| 947 | { |
| 948 | return (core_bfd != NULL); |
| 949 | } |
| 950 | |
| 951 | bool |
| 952 | core_target::has_registers () |
| 953 | { |
| 954 | return (core_bfd != NULL); |
| 955 | } |
| 956 | |
| 957 | /* Implement the to_info_proc method. */ |
| 958 | |
| 959 | bool |
| 960 | core_target::info_proc (const char *args, enum info_proc_what request) |
| 961 | { |
| 962 | struct gdbarch *gdbarch = get_current_arch (); |
| 963 | |
| 964 | /* Since this is the core file target, call the 'core_info_proc' |
| 965 | method on gdbarch, not 'info_proc'. */ |
| 966 | if (gdbarch_core_info_proc_p (gdbarch)) |
| 967 | gdbarch_core_info_proc (gdbarch, args, request); |
| 968 | |
| 969 | return true; |
| 970 | } |
| 971 | |
| 972 | void |
| 973 | _initialize_corelow (void) |
| 974 | { |
| 975 | add_target (core_target_info, core_target_open, filename_completer); |
| 976 | } |