| /* Core dump and executable file functions below target vector, for GDB. |
| |
| Copyright (C) 1986-2015 Free Software Foundation, Inc. |
| |
| This file is part of GDB. |
| |
| This program is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 3 of the License, or |
| (at your option) any later version. |
| |
| This program is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| |
| #include "defs.h" |
| #include "arch-utils.h" |
| #include <signal.h> |
| #include <fcntl.h> |
| #ifdef HAVE_SYS_FILE_H |
| #include <sys/file.h> /* needed for F_OK and friends */ |
| #endif |
| #include "frame.h" /* required by inferior.h */ |
| #include "inferior.h" |
| #include "infrun.h" |
| #include "symtab.h" |
| #include "command.h" |
| #include "bfd.h" |
| #include "target.h" |
| #include "gdbcore.h" |
| #include "gdbthread.h" |
| #include "regcache.h" |
| #include "regset.h" |
| #include "symfile.h" |
| #include "exec.h" |
| #include "readline/readline.h" |
| #include "solib.h" |
| #include "filenames.h" |
| #include "progspace.h" |
| #include "objfiles.h" |
| #include "gdb_bfd.h" |
| #include "completer.h" |
| #include "filestuff.h" |
| |
| #ifndef O_LARGEFILE |
| #define O_LARGEFILE 0 |
| #endif |
| |
| /* List of all available core_fns. On gdb startup, each core file |
| register reader calls deprecated_add_core_fns() to register |
| information on each core format it is prepared to read. */ |
| |
| static struct core_fns *core_file_fns = NULL; |
| |
| /* A subclass of target_ops that also holds data for a core |
| target. */ |
| |
| struct core_target_ops_with_data |
| { |
| /* The base class. */ |
| |
| struct target_ops base; |
| |
| /* The core_fns for a core file handler that is prepared to read the |
| core file currently open on core_bfd. */ |
| |
| struct core_fns *core_vec; |
| |
| /* The section table. Note that these target sections are *not* |
| mapped in the current address spaces' set of target sections --- |
| those should come only from pure executable or shared library |
| bfds. The core bfd sections are an implementation detail of the |
| core target, just like ptrace is for unix child targets. */ |
| struct target_section_table core_data; |
| }; |
| |
| static void core_files_info (struct target_ops *); |
| |
| static int gdb_check_format (bfd *); |
| |
| static void core_close_cleanup (void *ignore); |
| |
| static void add_to_thread_list (bfd *, asection *, void *); |
| |
| static void init_core_ops (void); |
| |
| void _initialize_corelow (void); |
| |
| static struct target_ops core_ops; |
| |
| /* An arbitrary identifier for the core inferior. */ |
| #define CORELOW_PID 1 |
| |
| /* Link a new core_fns into the global core_file_fns list. Called on |
| gdb startup by the _initialize routine in each core file register |
| reader, to register information about each format the reader is |
| prepared to handle. */ |
| |
| void |
| deprecated_add_core_fns (struct core_fns *cf) |
| { |
| cf->next = core_file_fns; |
| core_file_fns = cf; |
| } |
| |
| /* The default function that core file handlers can use to examine a |
| core file BFD and decide whether or not to accept the job of |
| reading the core file. */ |
| |
| int |
| default_core_sniffer (struct core_fns *our_fns, bfd *abfd) |
| { |
| int result; |
| |
| result = (bfd_get_flavour (abfd) == our_fns -> core_flavour); |
| return (result); |
| } |
| |
| /* Walk through the list of core functions to find a set that can |
| handle the core file open on ABFD. Returns pointer to set that is |
| selected. */ |
| |
| static struct core_fns * |
| sniff_core_bfd (bfd *abfd, struct gdbarch *core_gdbarch) |
| { |
| struct core_fns *cf; |
| struct core_fns *yummy = NULL; |
| int matches = 0;; |
| |
| /* Don't sniff if we have support for register sets in |
| CORE_GDBARCH. */ |
| if (core_gdbarch && gdbarch_iterate_over_regset_sections_p (core_gdbarch)) |
| return NULL; |
| |
| for (cf = core_file_fns; cf != NULL; cf = cf->next) |
| { |
| if (cf->core_sniffer (cf, abfd)) |
| { |
| yummy = cf; |
| matches++; |
| } |
| } |
| if (matches > 1) |
| { |
| warning (_("\"%s\": ambiguous core format, %d handlers match"), |
| bfd_get_filename (abfd), matches); |
| } |
| else if (matches == 0) |
| error (_("\"%s\": no core file handler recognizes format"), |
| bfd_get_filename (abfd)); |
| |
| return (yummy); |
| } |
| |
| /* The default is to reject every core file format we see. Either |
| BFD has to recognize it, or we have to provide a function in the |
| core file handler that recognizes it. */ |
| |
| int |
| default_check_format (bfd *abfd) |
| { |
| return (0); |
| } |
| |
| /* Attempt to recognize core file formats that BFD rejects. */ |
| |
| static int |
| gdb_check_format (bfd *abfd) |
| { |
| struct core_fns *cf; |
| |
| for (cf = core_file_fns; cf != NULL; cf = cf->next) |
| { |
| if (cf->check_format (abfd)) |
| { |
| return (1); |
| } |
| } |
| return (0); |
| } |
| |
| |
| |
| /* Return the core_target_ops_with_data for the current target stack, |
| if any. */ |
| |
| static struct core_target_ops_with_data * |
| get_core_target_ops (void) |
| { |
| struct target_ops *targ = find_target_at (process_stratum); |
| |
| if (targ == NULL || targ->to_identity != &core_ops) |
| return NULL; |
| |
| /* Downcast. */ |
| return (struct core_target_ops_with_data *) targ; |
| } |
| |
| /* Discard all vestiges of any previous core file and mark data and |
| stack spaces as empty. */ |
| |
| static void |
| core_xclose (struct target_ops *self) |
| { |
| /* Downcast. */ |
| struct core_target_ops_with_data *cops |
| = (struct core_target_ops_with_data *) self; |
| |
| gdb_assert (self->to_identity == &core_ops); |
| |
| if (core_bfd) |
| { |
| int pid = ptid_get_pid (inferior_ptid); |
| inferior_ptid = null_ptid; /* Avoid confusion from thread |
| stuff. */ |
| if (pid != 0) |
| exit_inferior_silent (pid); |
| |
| /* Clear out solib state while the bfd is still open. See |
| comments in clear_solib in solib.c. */ |
| clear_solib (); |
| |
| gdb_bfd_unref (core_bfd); |
| core_bfd = NULL; |
| } |
| |
| xfree (cops->core_data.sections); |
| xfree (cops); |
| } |
| |
| static void |
| core_close_cleanup (void *arg) |
| { |
| core_xclose (arg); |
| } |
| |
| /* Look for sections whose names start with `.reg/' so that we can |
| extract the list of threads in a core file. */ |
| |
| static void |
| add_to_thread_list (bfd *abfd, asection *asect, void *reg_sect_arg) |
| { |
| ptid_t ptid; |
| int core_tid; |
| int pid, lwpid; |
| asection *reg_sect = (asection *) reg_sect_arg; |
| int fake_pid_p = 0; |
| struct inferior *inf; |
| |
| if (!startswith (bfd_section_name (abfd, asect), ".reg/")) |
| return; |
| |
| core_tid = atoi (bfd_section_name (abfd, asect) + 5); |
| |
| pid = bfd_core_file_pid (core_bfd); |
| if (pid == 0) |
| { |
| fake_pid_p = 1; |
| pid = CORELOW_PID; |
| } |
| |
| lwpid = core_tid; |
| |
| inf = current_inferior (); |
| if (inf->pid == 0) |
| { |
| inferior_appeared (inf, pid); |
| inf->fake_pid_p = fake_pid_p; |
| } |
| |
| ptid = ptid_build (pid, lwpid, 0); |
| |
| add_thread (ptid); |
| |
| /* Warning, Will Robinson, looking at BFD private data! */ |
| |
| if (reg_sect != NULL |
| && asect->filepos == reg_sect->filepos) /* Did we find .reg? */ |
| inferior_ptid = ptid; /* Yes, make it current. */ |
| } |
| |
| /* This routine opens and sets up the core file bfd. */ |
| |
| static void |
| core_open (const char *arg, int from_tty) |
| { |
| const char *p; |
| int siggy; |
| struct cleanup *old_chain; |
| char *temp; |
| bfd *temp_bfd; |
| int scratch_chan; |
| int flags; |
| volatile struct gdb_exception except; |
| char *filename; |
| struct core_target_ops_with_data *cops; |
| struct gdbarch *core_gdbarch; |
| |
| target_preopen (from_tty); |
| if (!arg) |
| { |
| if (core_bfd) |
| error (_("No core file specified. (Use `detach' " |
| "to stop debugging a core file.)")); |
| else |
| error (_("No core file specified.")); |
| } |
| |
| filename = tilde_expand (arg); |
| if (!IS_ABSOLUTE_PATH (filename)) |
| { |
| temp = concat (current_directory, "/", |
| filename, (char *) NULL); |
| xfree (filename); |
| filename = temp; |
| } |
| |
| old_chain = make_cleanup (xfree, filename); |
| |
| flags = O_BINARY | O_LARGEFILE; |
| if (write_files) |
| flags |= O_RDWR; |
| else |
| flags |= O_RDONLY; |
| scratch_chan = gdb_open_cloexec (filename, flags, 0); |
| if (scratch_chan < 0) |
| perror_with_name (filename); |
| |
| temp_bfd = gdb_bfd_fopen (filename, gnutarget, |
| write_files ? FOPEN_RUB : FOPEN_RB, |
| scratch_chan); |
| if (temp_bfd == NULL) |
| perror_with_name (filename); |
| |
| if (!bfd_check_format (temp_bfd, bfd_core) |
| && !gdb_check_format (temp_bfd)) |
| { |
| /* Do it after the err msg */ |
| /* FIXME: should be checking for errors from bfd_close (for one |
| thing, on error it does not free all the storage associated |
| with the bfd). */ |
| make_cleanup_bfd_unref (temp_bfd); |
| error (_("\"%s\" is not a core dump: %s"), |
| filename, bfd_errmsg (bfd_get_error ())); |
| } |
| |
| /* Looks semi-reasonable. Toss the old core file and work on the |
| new. */ |
| |
| do_cleanups (old_chain); |
| unpush_target (&core_ops); |
| core_bfd = temp_bfd; |
| |
| cops = TARGET_NEW (struct core_target_ops_with_data, &core_ops); |
| old_chain = make_cleanup (core_close_cleanup, cops); |
| |
| core_gdbarch = gdbarch_from_bfd (core_bfd); |
| |
| /* Find a suitable core file handler to munch on core_bfd */ |
| cops->core_vec = sniff_core_bfd (core_bfd, core_gdbarch); |
| |
| validate_files (); |
| |
| /* Find the data section */ |
| if (build_section_table (core_bfd, |
| &cops->core_data.sections, |
| &cops->core_data.sections_end)) |
| error (_("\"%s\": Can't find sections: %s"), |
| bfd_get_filename (core_bfd), bfd_errmsg (bfd_get_error ())); |
| |
| /* If we have no exec file, try to set the architecture from the |
| core file. We don't do this unconditionally since an exec file |
| typically contains more information that helps us determine the |
| architecture than a core file. */ |
| if (!exec_bfd) |
| set_gdbarch_from_file (core_bfd); |
| |
| push_target (&cops->base); |
| discard_cleanups (old_chain); |
| |
| /* Do this before acknowledging the inferior, so if |
| post_create_inferior throws (can happen easilly if you're loading |
| a core file with the wrong exec), we aren't left with threads |
| from the previous inferior. */ |
| init_thread_list (); |
| |
| inferior_ptid = null_ptid; |
| |
| /* Need to flush the register cache (and the frame cache) from a |
| previous debug session. If inferior_ptid ends up the same as the |
| last debug session --- e.g., b foo; run; gcore core1; step; gcore |
| core2; core core1; core core2 --- then there's potential for |
| get_current_regcache to return the cached regcache of the |
| previous session, and the frame cache being stale. */ |
| registers_changed (); |
| |
| /* Build up thread list from BFD sections, and possibly set the |
| current thread to the .reg/NN section matching the .reg |
| section. */ |
| bfd_map_over_sections (core_bfd, add_to_thread_list, |
| bfd_get_section_by_name (core_bfd, ".reg")); |
| |
| if (ptid_equal (inferior_ptid, null_ptid)) |
| { |
| /* Either we found no .reg/NN section, and hence we have a |
| non-threaded core (single-threaded, from gdb's perspective), |
| or for some reason add_to_thread_list couldn't determine |
| which was the "main" thread. The latter case shouldn't |
| usually happen, but we're dealing with input here, which can |
| always be broken in different ways. */ |
| struct thread_info *thread = first_thread_of_process (-1); |
| |
| if (thread == NULL) |
| { |
| inferior_appeared (current_inferior (), CORELOW_PID); |
| inferior_ptid = pid_to_ptid (CORELOW_PID); |
| add_thread_silent (inferior_ptid); |
| } |
| else |
| switch_to_thread (thread->ptid); |
| } |
| |
| post_create_inferior (&cops->base, from_tty); |
| |
| /* post_create_inferior has filled in the gdbarch of this inferior, |
| so work with that one from here onwards. */ |
| core_gdbarch = target_gdbarch (); |
| |
| /* Now go through the target stack looking for threads since there |
| may be a thread_stratum target loaded on top of target core by |
| now. The layer above should claim threads found in the BFD |
| sections. */ |
| TRY |
| { |
| target_update_thread_list (); |
| } |
| |
| CATCH (except, RETURN_MASK_ERROR) |
| { |
| exception_print (gdb_stderr, except); |
| } |
| END_CATCH |
| |
| p = bfd_core_file_failing_command (core_bfd); |
| if (p) |
| printf_filtered (_("Core was generated by `%s'.\n"), p); |
| |
| /* Clearing any previous state of convenience variables. */ |
| clear_exit_convenience_vars (); |
| |
| siggy = bfd_core_file_failing_signal (core_bfd); |
| if (siggy > 0) |
| { |
| /* If we don't have a CORE_GDBARCH to work with, assume a native |
| core (map gdb_signal from host signals). If we do have |
| CORE_GDBARCH to work with, but no gdb_signal_from_target |
| implementation for that gdbarch, as a fallback measure, |
| assume the host signal mapping. It'll be correct for native |
| cores, but most likely incorrect for cross-cores. */ |
| enum gdb_signal sig |
| = (core_gdbarch != NULL |
| && gdbarch_gdb_signal_from_target_p (core_gdbarch) |
| ? gdbarch_gdb_signal_from_target (core_gdbarch, siggy) |
| : gdb_signal_from_host (siggy)); |
| |
| printf_filtered (_("Program terminated with signal %s, %s.\n"), |
| gdb_signal_to_name (sig), gdb_signal_to_string (sig)); |
| |
| /* Set the value of the internal variable $_exitsignal, |
| which holds the signal uncaught by the inferior. */ |
| set_internalvar_integer (lookup_internalvar ("_exitsignal"), |
| siggy); |
| } |
| |
| /* Fetch all registers from core file. */ |
| target_fetch_registers (get_current_regcache (), -1); |
| |
| /* Now, set up the frame cache, and print the top of stack. */ |
| reinit_frame_cache (); |
| print_stack_frame (get_selected_frame (NULL), 1, SRC_AND_LOC, 1); |
| |
| /* Current thread should be NUM 1 but the user does not know that. |
| If a program is single threaded gdb in general does not mention |
| anything about threads. That is why the test is >= 2. */ |
| if (thread_count () >= 2) |
| { |
| TRY |
| { |
| thread_command (NULL, from_tty); |
| } |
| CATCH (except, RETURN_MASK_ERROR) |
| { |
| exception_print (gdb_stderr, except); |
| } |
| END_CATCH |
| } |
| } |
| |
| static void |
| core_detach (struct target_ops *ops, const char *args, int from_tty) |
| { |
| if (args) |
| error (_("Too many arguments")); |
| unpush_target (ops); |
| reinit_frame_cache (); |
| if (from_tty) |
| printf_filtered (_("No core file now.\n")); |
| } |
| |
| /* Try to retrieve registers from a section in core_bfd, and supply |
| them to core_vec->core_read_registers, as the register set numbered |
| WHICH. |
| |
| If inferior_ptid's lwp member is zero, do the single-threaded |
| thing: look for a section named NAME. If inferior_ptid's lwp |
| member is non-zero, do the multi-threaded thing: look for a section |
| named "NAME/LWP", where LWP is the shortest ASCII decimal |
| representation of inferior_ptid's lwp member. |
| |
| HUMAN_NAME is a human-readable name for the kind of registers the |
| NAME section contains, for use in error messages. |
| |
| If REQUIRED is non-zero, print an error if the core file doesn't |
| have a section by the appropriate name. Otherwise, just do |
| nothing. */ |
| |
| static void |
| get_core_register_section (struct regcache *regcache, |
| const struct regset *regset, |
| const char *name, |
| int min_size, |
| int which, |
| const char *human_name, |
| int required) |
| { |
| static char *section_name = NULL; |
| struct bfd_section *section; |
| bfd_size_type size; |
| char *contents; |
| struct core_target_ops_with_data *cops = get_core_target_ops (); |
| |
| xfree (section_name); |
| |
| if (ptid_get_lwp (inferior_ptid)) |
| section_name = xstrprintf ("%s/%ld", name, |
| ptid_get_lwp (inferior_ptid)); |
| else |
| section_name = xstrdup (name); |
| |
| section = bfd_get_section_by_name (core_bfd, section_name); |
| if (! section) |
| { |
| if (required) |
| warning (_("Couldn't find %s registers in core file."), |
| human_name); |
| return; |
| } |
| |
| size = bfd_section_size (core_bfd, section); |
| if (size < min_size) |
| { |
| warning (_("Section `%s' in core file too small."), section_name); |
| return; |
| } |
| if (size != min_size && !(regset->flags & REGSET_VARIABLE_SIZE)) |
| { |
| warning (_("Unexpected size of section `%s' in core file."), |
| section_name); |
| } |
| |
| contents = (char *) alloca (size); |
| |
| contents = alloca (size); |
| if (! bfd_get_section_contents (core_bfd, section, contents, |
| (file_ptr) 0, size)) |
| { |
| warning (_("Couldn't read %s registers from `%s' section in core file."), |
| human_name, name); |
| return; |
| } |
| |
| if (regset != NULL) |
| { |
| regset->supply_regset (regset, regcache, -1, contents, size); |
| return; |
| } |
| |
| gdb_assert (cops->core_vec); |
| cops->core_vec->core_read_registers (regcache, contents, size, which, |
| ((CORE_ADDR) |
| bfd_section_vma (core_bfd, section))); |
| } |
| |
| /* Callback for get_core_registers that handles a single core file |
| register note section. */ |
| |
| static void |
| get_core_registers_cb (const char *sect_name, int size, |
| const struct regset *regset, |
| const char *human_name, void *cb_data) |
| { |
| struct regcache *regcache = (struct regcache *) cb_data; |
| int required = 0; |
| |
| if (strcmp (sect_name, ".reg") == 0) |
| { |
| required = 1; |
| if (human_name == NULL) |
| human_name = "general-purpose"; |
| } |
| else if (strcmp (sect_name, ".reg2") == 0) |
| { |
| if (human_name == NULL) |
| human_name = "floating-point"; |
| } |
| |
| /* The 'which' parameter is only used when no regset is provided. |
| Thus we just set it to -1. */ |
| get_core_register_section (regcache, regset, sect_name, |
| size, -1, human_name, required); |
| } |
| |
| /* Get the registers out of a core file. This is the machine- |
| independent part. Fetch_core_registers is the machine-dependent |
| part, typically implemented in the xm-file for each |
| architecture. */ |
| |
| /* We just get all the registers, so we don't use regno. */ |
| |
| static void |
| get_core_registers (struct target_ops *ops, |
| struct regcache *regcache, int regno) |
| { |
| struct core_regset_section *sect_list; |
| int i; |
| struct core_target_ops_with_data *cops = get_core_target_ops (); |
| |
| if (!(gdbarch_iterate_over_regset_sections_p (target_gdbarch ())) |
| && (cops->core_vec == NULL |
| || cops->core_vec->core_read_registers == NULL)) |
| { |
| fprintf_filtered (gdb_stderr, |
| "Can't fetch registers from this type of core file\n"); |
| return; |
| } |
| |
| if (gdbarch_iterate_over_regset_sections_p (target_gdbarch ())) |
| gdbarch_iterate_over_regset_sections (target_gdbarch (), |
| get_core_registers_cb, |
| (void *) regcache, NULL); |
| else |
| { |
| get_core_register_section (regcache, NULL, |
| ".reg", 0, 0, "general-purpose", 1); |
| get_core_register_section (regcache, NULL, |
| ".reg2", 0, 2, "floating-point", 0); |
| } |
| |
| /* Mark all registers not found in the core as unavailable. */ |
| for (i = 0; i < gdbarch_num_regs (get_regcache_arch (regcache)); i++) |
| if (regcache_register_status (regcache, i) == REG_UNKNOWN) |
| regcache_raw_supply (regcache, i, NULL); |
| } |
| |
| static void |
| core_files_info (struct target_ops *t) |
| { |
| struct core_target_ops_with_data *cops = get_core_target_ops (); |
| |
| print_section_info (&cops->core_data, core_bfd); |
| } |
| |
| struct spuid_list |
| { |
| gdb_byte *buf; |
| ULONGEST offset; |
| LONGEST len; |
| ULONGEST pos; |
| ULONGEST written; |
| }; |
| |
| static void |
| add_to_spuid_list (bfd *abfd, asection *asect, void *list_p) |
| { |
| struct spuid_list *list = (struct spuid_list *) list_p; |
| enum bfd_endian byte_order |
| = bfd_big_endian (abfd) ? BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE; |
| int fd, pos = 0; |
| |
| sscanf (bfd_section_name (abfd, asect), "SPU/%d/regs%n", &fd, &pos); |
| if (pos == 0) |
| return; |
| |
| if (list->pos >= list->offset && list->pos + 4 <= list->offset + list->len) |
| { |
| store_unsigned_integer (list->buf + list->pos - list->offset, |
| 4, byte_order, fd); |
| list->written += 4; |
| } |
| list->pos += 4; |
| } |
| |
| /* Read siginfo data from the core, if possible. Returns -1 on |
| failure. Otherwise, returns the number of bytes read. ABFD is the |
| core file's BFD; READBUF, OFFSET, and LEN are all as specified by |
| the to_xfer_partial interface. */ |
| |
| static LONGEST |
| get_core_siginfo (bfd *abfd, gdb_byte *readbuf, ULONGEST offset, ULONGEST len) |
| { |
| asection *section; |
| char *section_name; |
| const char *name = ".note.linuxcore.siginfo"; |
| |
| if (ptid_get_lwp (inferior_ptid)) |
| section_name = xstrprintf ("%s/%ld", name, |
| ptid_get_lwp (inferior_ptid)); |
| else |
| section_name = xstrdup (name); |
| |
| section = bfd_get_section_by_name (abfd, section_name); |
| xfree (section_name); |
| if (section == NULL) |
| return -1; |
| |
| if (!bfd_get_section_contents (abfd, section, readbuf, offset, len)) |
| return -1; |
| |
| return len; |
| } |
| |
| static enum target_xfer_status |
| core_xfer_partial (struct target_ops *ops, enum target_object object, |
| const char *annex, gdb_byte *readbuf, |
| const gdb_byte *writebuf, ULONGEST offset, |
| ULONGEST len, ULONGEST *xfered_len) |
| { |
| struct core_target_ops_with_data *cops = get_core_target_ops (); |
| |
| switch (object) |
| { |
| case TARGET_OBJECT_MEMORY: |
| return section_table_xfer_memory_partial (readbuf, writebuf, |
| offset, len, xfered_len, |
| cops->core_data.sections, |
| cops->core_data.sections_end, |
| NULL); |
| |
| case TARGET_OBJECT_AUXV: |
| if (readbuf) |
| { |
| /* When the aux vector is stored in core file, BFD |
| represents this with a fake section called ".auxv". */ |
| |
| struct bfd_section *section; |
| bfd_size_type size; |
| |
| section = bfd_get_section_by_name (core_bfd, ".auxv"); |
| if (section == NULL) |
| return TARGET_XFER_E_IO; |
| |
| size = bfd_section_size (core_bfd, section); |
| if (offset >= size) |
| return TARGET_XFER_EOF; |
| size -= offset; |
| if (size > len) |
| size = len; |
| |
| if (size == 0) |
| return TARGET_XFER_EOF; |
| if (!bfd_get_section_contents (core_bfd, section, readbuf, |
| (file_ptr) offset, size)) |
| { |
| warning (_("Couldn't read NT_AUXV note in core file.")); |
| return TARGET_XFER_E_IO; |
| } |
| |
| *xfered_len = (ULONGEST) size; |
| return TARGET_XFER_OK; |
| } |
| return TARGET_XFER_E_IO; |
| |
| case TARGET_OBJECT_WCOOKIE: |
| if (readbuf) |
| { |
| /* When the StackGhost cookie is stored in core file, BFD |
| represents this with a fake section called |
| ".wcookie". */ |
| |
| struct bfd_section *section; |
| bfd_size_type size; |
| |
| section = bfd_get_section_by_name (core_bfd, ".wcookie"); |
| if (section == NULL) |
| return TARGET_XFER_E_IO; |
| |
| size = bfd_section_size (core_bfd, section); |
| if (offset >= size) |
| return TARGET_XFER_EOF; |
| size -= offset; |
| if (size > len) |
| size = len; |
| |
| if (size == 0) |
| return TARGET_XFER_EOF; |
| if (!bfd_get_section_contents (core_bfd, section, readbuf, |
| (file_ptr) offset, size)) |
| { |
| warning (_("Couldn't read StackGhost cookie in core file.")); |
| return TARGET_XFER_E_IO; |
| } |
| |
| *xfered_len = (ULONGEST) size; |
| return TARGET_XFER_OK; |
| |
| } |
| return TARGET_XFER_E_IO; |
| |
| case TARGET_OBJECT_LIBRARIES: |
| if (gdbarch_core_xfer_shared_libraries_p (target_gdbarch ())) |
| { |
| if (writebuf) |
| return TARGET_XFER_E_IO; |
| else |
| { |
| *xfered_len |
| = gdbarch_core_xfer_shared_libraries (target_gdbarch (), |
| readbuf, |
| offset, len); |
| |
| if (*xfered_len == 0) |
| return TARGET_XFER_EOF; |
| else |
| return TARGET_XFER_OK; |
| } |
| } |
| /* FALL THROUGH */ |
| |
| case TARGET_OBJECT_LIBRARIES_AIX: |
| if (gdbarch_core_xfer_shared_libraries_aix_p (target_gdbarch ())) |
| { |
| if (writebuf) |
| return TARGET_XFER_E_IO; |
| else |
| { |
| *xfered_len |
| = gdbarch_core_xfer_shared_libraries_aix (target_gdbarch (), |
| readbuf, offset, |
| len); |
| |
| if (*xfered_len == 0) |
| return TARGET_XFER_EOF; |
| else |
| return TARGET_XFER_OK; |
| } |
| } |
| /* FALL THROUGH */ |
| |
| case TARGET_OBJECT_SPU: |
| if (readbuf && annex) |
| { |
| /* When the SPU contexts are stored in a core file, BFD |
| represents this with a fake section called |
| "SPU/<annex>". */ |
| |
| struct bfd_section *section; |
| bfd_size_type size; |
| char sectionstr[100]; |
| |
| xsnprintf (sectionstr, sizeof sectionstr, "SPU/%s", annex); |
| |
| section = bfd_get_section_by_name (core_bfd, sectionstr); |
| if (section == NULL) |
| return TARGET_XFER_E_IO; |
| |
| size = bfd_section_size (core_bfd, section); |
| if (offset >= size) |
| return TARGET_XFER_EOF; |
| size -= offset; |
| if (size > len) |
| size = len; |
| |
| if (size == 0) |
| return TARGET_XFER_EOF; |
| if (!bfd_get_section_contents (core_bfd, section, readbuf, |
| (file_ptr) offset, size)) |
| { |
| warning (_("Couldn't read SPU section in core file.")); |
| return TARGET_XFER_E_IO; |
| } |
| |
| *xfered_len = (ULONGEST) size; |
| return TARGET_XFER_OK; |
| } |
| else if (readbuf) |
| { |
| /* NULL annex requests list of all present spuids. */ |
| struct spuid_list list; |
| |
| list.buf = readbuf; |
| list.offset = offset; |
| list.len = len; |
| list.pos = 0; |
| list.written = 0; |
| bfd_map_over_sections (core_bfd, add_to_spuid_list, &list); |
| |
| if (list.written == 0) |
| return TARGET_XFER_EOF; |
| else |
| { |
| *xfered_len = (ULONGEST) list.written; |
| return TARGET_XFER_OK; |
| } |
| } |
| return TARGET_XFER_E_IO; |
| |
| case TARGET_OBJECT_SIGNAL_INFO: |
| if (readbuf) |
| { |
| LONGEST l = get_core_siginfo (core_bfd, readbuf, offset, len); |
| |
| if (l > 0) |
| { |
| *xfered_len = len; |
| return TARGET_XFER_OK; |
| } |
| } |
| return TARGET_XFER_E_IO; |
| |
| default: |
| return ops->beneath->to_xfer_partial (ops->beneath, object, |
| annex, readbuf, |
| writebuf, offset, len, |
| xfered_len); |
| } |
| } |
| |
| |
| /* If mourn is being called in all the right places, this could be say |
| `gdb internal error' (since generic_mourn calls |
| breakpoint_init_inferior). */ |
| |
| static int |
| ignore (struct target_ops *ops, struct gdbarch *gdbarch, |
| struct bp_target_info *bp_tgt) |
| { |
| return 0; |
| } |
| |
| |
| /* Okay, let's be honest: threads gleaned from a core file aren't |
| exactly lively, are they? On the other hand, if we don't claim |
| that each & every one is alive, then we don't get any of them |
| to appear in an "info thread" command, which is quite a useful |
| behaviour. |
| */ |
| static int |
| core_thread_alive (struct target_ops *ops, ptid_t ptid) |
| { |
| return 1; |
| } |
| |
| /* Ask the current architecture what it knows about this core file. |
| That will be used, in turn, to pick a better architecture. This |
| wrapper could be avoided if targets got a chance to specialize |
| core_ops. */ |
| |
| static const struct target_desc * |
| core_read_description (struct target_ops *target) |
| { |
| struct core_target_ops_with_data *cops = get_core_target_ops (); |
| |
| if (gdbarch_core_read_description_p (target_gdbarch ())) |
| { |
| const struct target_desc *result; |
| |
| result = gdbarch_core_read_description (target_gdbarch (), |
| target, core_bfd); |
| if (result != NULL) |
| return result; |
| } |
| |
| return target->beneath->to_read_description (target->beneath); |
| } |
| |
| static char * |
| core_pid_to_str (struct target_ops *ops, ptid_t ptid) |
| { |
| static char buf[64]; |
| struct inferior *inf; |
| int pid; |
| struct core_target_ops_with_data *cops = get_core_target_ops (); |
| |
| /* The preferred way is to have a gdbarch/OS specific |
| implementation. */ |
| if (gdbarch_core_pid_to_str_p (target_gdbarch ())) |
| return gdbarch_core_pid_to_str (target_gdbarch (), ptid); |
| |
| /* Otherwise, if we don't have one, we'll just fallback to |
| "process", with normal_pid_to_str. */ |
| |
| /* Try the LWPID field first. */ |
| pid = ptid_get_lwp (ptid); |
| if (pid != 0) |
| return normal_pid_to_str (pid_to_ptid (pid)); |
| |
| /* Otherwise, this isn't a "threaded" core -- use the PID field, but |
| only if it isn't a fake PID. */ |
| inf = find_inferior_pid (ptid_get_pid (ptid)); |
| if (inf != NULL && !inf->fake_pid_p) |
| return normal_pid_to_str (ptid); |
| |
| /* No luck. We simply don't have a valid PID to print. */ |
| xsnprintf (buf, sizeof buf, "<main task>"); |
| return buf; |
| } |
| |
| static int |
| core_has_memory (struct target_ops *ops) |
| { |
| return (core_bfd != NULL); |
| } |
| |
| static int |
| core_has_stack (struct target_ops *ops) |
| { |
| return (core_bfd != NULL); |
| } |
| |
| static int |
| core_has_registers (struct target_ops *ops) |
| { |
| return (core_bfd != NULL); |
| } |
| |
| /* Implement the to_info_proc method. */ |
| |
| static void |
| core_info_proc (struct target_ops *ops, const char *args, |
| enum info_proc_what request) |
| { |
| struct gdbarch *gdbarch = get_current_arch (); |
| |
| /* Since this is the core file target, call the 'core_info_proc' |
| method on gdbarch, not 'info_proc'. */ |
| if (gdbarch_core_info_proc_p (gdbarch)) |
| gdbarch_core_info_proc (gdbarch, args, request); |
| } |
| |
| /* Fill in core_ops with its defined operations and properties. */ |
| |
| static void |
| init_core_ops (void) |
| { |
| core_ops.to_shortname = "core"; |
| core_ops.to_longname = "Local core dump file"; |
| core_ops.to_doc = |
| "Use a core file as a target. Specify the filename of the core file."; |
| core_ops.to_open = core_open; |
| core_ops.to_xclose = core_xclose; |
| core_ops.to_detach = core_detach; |
| core_ops.to_fetch_registers = get_core_registers; |
| core_ops.to_xfer_partial = core_xfer_partial; |
| core_ops.to_files_info = core_files_info; |
| core_ops.to_insert_breakpoint = ignore; |
| core_ops.to_remove_breakpoint = ignore; |
| core_ops.to_thread_alive = core_thread_alive; |
| core_ops.to_read_description = core_read_description; |
| core_ops.to_pid_to_str = core_pid_to_str; |
| core_ops.to_stratum = process_stratum; |
| core_ops.to_has_memory = core_has_memory; |
| core_ops.to_has_stack = core_has_stack; |
| core_ops.to_has_registers = core_has_registers; |
| core_ops.to_info_proc = core_info_proc; |
| core_ops.to_magic = OPS_MAGIC; |
| |
| if (core_target) |
| internal_error (__FILE__, __LINE__, |
| _("init_core_ops: core target already exists (\"%s\")."), |
| core_target->to_longname); |
| core_target = &core_ops; |
| } |
| |
| void |
| _initialize_corelow (void) |
| { |
| init_core_ops (); |
| |
| add_target_with_completer (&core_ops, filename_completer); |
| } |