| /* Core dump and executable file functions below target vector, for GDB. |
| |
| Copyright (C) 1986-2020 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> |
| #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 "process-stratum-target.h" |
| #include "gdbcore.h" |
| #include "gdbthread.h" |
| #include "regcache.h" |
| #include "regset.h" |
| #include "symfile.h" |
| #include "exec.h" |
| #include "readline/tilde.h" |
| #include "solib.h" |
| #include "filenames.h" |
| #include "progspace.h" |
| #include "objfiles.h" |
| #include "gdb_bfd.h" |
| #include "completer.h" |
| #include "gdbsupport/filestuff.h" |
| #include "build-id.h" |
| |
| #ifndef O_LARGEFILE |
| #define O_LARGEFILE 0 |
| #endif |
| |
| static core_fns *sniff_core_bfd (gdbarch *core_gdbarch, |
| bfd *abfd); |
| |
| /* The core file target. */ |
| |
| static const target_info core_target_info = { |
| "core", |
| N_("Local core dump file"), |
| N_("Use a core file as a target.\n\ |
| Specify the filename of the core file.") |
| }; |
| |
| class core_target final : public process_stratum_target |
| { |
| public: |
| core_target (); |
| ~core_target () override; |
| |
| const target_info &info () const override |
| { return core_target_info; } |
| |
| void close () override; |
| void detach (inferior *, int) override; |
| void fetch_registers (struct regcache *, int) override; |
| |
| enum target_xfer_status xfer_partial (enum target_object object, |
| const char *annex, |
| gdb_byte *readbuf, |
| const gdb_byte *writebuf, |
| ULONGEST offset, ULONGEST len, |
| ULONGEST *xfered_len) override; |
| void files_info () override; |
| |
| bool thread_alive (ptid_t ptid) override; |
| const struct target_desc *read_description () override; |
| |
| std::string pid_to_str (ptid_t) override; |
| |
| const char *thread_name (struct thread_info *) override; |
| |
| bool has_all_memory () override { return false; } |
| bool has_memory () override; |
| bool has_stack () override; |
| bool has_registers () override; |
| bool has_execution (ptid_t) override { return false; } |
| |
| bool info_proc (const char *, enum info_proc_what) override; |
| |
| /* A few helpers. */ |
| |
| /* Getter, see variable definition. */ |
| struct gdbarch *core_gdbarch () |
| { |
| return m_core_gdbarch; |
| } |
| |
| /* See definition. */ |
| void get_core_register_section (struct regcache *regcache, |
| const struct regset *regset, |
| const char *name, |
| int section_min_size, |
| int which, |
| const char *human_name, |
| bool required); |
| |
| private: /* per-core data */ |
| |
| /* The core's 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. */ |
| target_section_table m_core_section_table {}; |
| |
| /* The core_fns for a core file handler that is prepared to read the |
| core file currently open on core_bfd. */ |
| core_fns *m_core_vec = NULL; |
| |
| /* FIXME: kettenis/20031023: Eventually this field should |
| disappear. */ |
| struct gdbarch *m_core_gdbarch = NULL; |
| }; |
| |
| core_target::core_target () |
| { |
| m_core_gdbarch = gdbarch_from_bfd (core_bfd); |
| |
| /* Find a suitable core file handler to munch on core_bfd */ |
| m_core_vec = sniff_core_bfd (m_core_gdbarch, core_bfd); |
| |
| /* Find the data section */ |
| if (build_section_table (core_bfd, |
| &m_core_section_table.sections, |
| &m_core_section_table.sections_end)) |
| error (_("\"%s\": Can't find sections: %s"), |
| bfd_get_filename (core_bfd), bfd_errmsg (bfd_get_error ())); |
| } |
| |
| core_target::~core_target () |
| { |
| xfree (m_core_section_table.sections); |
| } |
| |
| /* 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; |
| |
| static int gdb_check_format (bfd *); |
| |
| static void add_to_thread_list (bfd *, asection *, void *); |
| |
| /* 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 (struct gdbarch *core_gdbarch, bfd *abfd) |
| { |
| 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); |
| } |
| |
| /* Close the core target. */ |
| |
| void |
| core_target::close () |
| { |
| if (core_bfd) |
| { |
| inferior_ptid = null_ptid; /* Avoid confusion from thread |
| stuff. */ |
| exit_inferior_silent (current_inferior ()); |
| |
| /* Clear out solib state while the bfd is still open. See |
| comments in clear_solib in solib.c. */ |
| clear_solib (); |
| |
| current_program_space->cbfd.reset (nullptr); |
| } |
| |
| /* Core targets are heap-allocated (see core_target_open), so here |
| we delete ourselves. */ |
| delete this; |
| } |
| |
| /* 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; |
| bool fake_pid_p = false; |
| struct inferior *inf; |
| |
| if (!startswith (bfd_section_name (asect), ".reg/")) |
| return; |
| |
| core_tid = atoi (bfd_section_name (asect) + 5); |
| |
| pid = bfd_core_file_pid (core_bfd); |
| if (pid == 0) |
| { |
| fake_pid_p = true; |
| 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_t (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. */ |
| } |
| |
| /* Issue a message saying we have no core to debug, if FROM_TTY. */ |
| |
| static void |
| maybe_say_no_core_file_now (int from_tty) |
| { |
| if (from_tty) |
| printf_filtered (_("No core file now.\n")); |
| } |
| |
| /* Backward compatibility with old way of specifying core files. */ |
| |
| void |
| core_file_command (const char *filename, int from_tty) |
| { |
| dont_repeat (); /* Either way, seems bogus. */ |
| |
| if (filename == NULL) |
| { |
| if (core_bfd != NULL) |
| { |
| target_detach (current_inferior (), from_tty); |
| gdb_assert (core_bfd == NULL); |
| } |
| else |
| maybe_say_no_core_file_now (from_tty); |
| } |
| else |
| core_target_open (filename, from_tty); |
| } |
| |
| /* Locate (and load) an executable file (and symbols) given the core file |
| BFD ABFD. */ |
| |
| static void |
| locate_exec_from_corefile_build_id (bfd *abfd, int from_tty) |
| { |
| const bfd_build_id *build_id = build_id_bfd_get (abfd); |
| if (build_id == nullptr) |
| return; |
| |
| gdb_bfd_ref_ptr execbfd |
| = build_id_to_exec_bfd (build_id->size, build_id->data); |
| |
| if (execbfd != nullptr) |
| { |
| exec_file_attach (bfd_get_filename (execbfd.get ()), from_tty); |
| symbol_file_add_main (bfd_get_filename (execbfd.get ()), |
| symfile_add_flag (from_tty ? SYMFILE_VERBOSE : 0)); |
| } |
| } |
| |
| /* See gdbcore.h. */ |
| |
| void |
| core_target_open (const char *arg, int from_tty) |
| { |
| const char *p; |
| int siggy; |
| int scratch_chan; |
| int flags; |
| |
| 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.")); |
| } |
| |
| gdb::unique_xmalloc_ptr<char> filename (tilde_expand (arg)); |
| if (!IS_ABSOLUTE_PATH (filename.get ())) |
| filename.reset (concat (current_directory, "/", |
| filename.get (), (char *) NULL)); |
| |
| flags = O_BINARY | O_LARGEFILE; |
| if (write_files) |
| flags |= O_RDWR; |
| else |
| flags |= O_RDONLY; |
| scratch_chan = gdb_open_cloexec (filename.get (), flags, 0); |
| if (scratch_chan < 0) |
| perror_with_name (filename.get ()); |
| |
| gdb_bfd_ref_ptr temp_bfd (gdb_bfd_fopen (filename.get (), gnutarget, |
| write_files ? FOPEN_RUB : FOPEN_RB, |
| scratch_chan)); |
| if (temp_bfd == NULL) |
| perror_with_name (filename.get ()); |
| |
| if (!bfd_check_format (temp_bfd.get (), bfd_core) |
| && !gdb_check_format (temp_bfd.get ())) |
| { |
| /* 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). */ |
| error (_("\"%s\" is not a core dump: %s"), |
| filename.get (), bfd_errmsg (bfd_get_error ())); |
| } |
| |
| current_program_space->cbfd = std::move (temp_bfd); |
| |
| core_target *target = new core_target (); |
| |
| /* Own the target until it is successfully pushed. */ |
| target_ops_up target_holder (target); |
| |
| validate_files (); |
| |
| /* 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 (std::move (target_holder)); |
| |
| 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 (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. */ |
| thread_info *thread = first_thread_of_inferior (current_inferior ()); |
| |
| if (thread == NULL) |
| { |
| inferior_appeared (current_inferior (), CORELOW_PID); |
| inferior_ptid = ptid_t (CORELOW_PID); |
| add_thread_silent (inferior_ptid); |
| } |
| else |
| switch_to_thread (thread); |
| } |
| |
| if (exec_bfd == nullptr) |
| locate_exec_from_corefile_build_id (core_bfd, from_tty); |
| |
| post_create_inferior (target, from_tty); |
| |
| /* 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 (const gdb_exception_error &except) |
| { |
| exception_print (gdb_stderr, except); |
| } |
| |
| 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) |
| { |
| gdbarch *core_gdbarch = target->core_gdbarch (); |
| |
| /* 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 (const gdb_exception_error &except) |
| { |
| exception_print (gdb_stderr, except); |
| } |
| } |
| } |
| |
| void |
| core_target::detach (inferior *inf, int from_tty) |
| { |
| /* Note that 'this' is dangling after this call. unpush_target |
| closes the target, and our close implementation deletes |
| 'this'. */ |
| unpush_target (this); |
| |
| /* Clear the register cache and the frame cache. */ |
| registers_changed (); |
| reinit_frame_cache (); |
| maybe_say_no_core_file_now (from_tty); |
| } |
| |
| /* Try to retrieve registers from a section in core_bfd, and supply |
| them to m_core_vec->core_read_registers, as the register set |
| numbered WHICH. |
| |
| If ptid's lwp member is zero, do the single-threaded |
| thing: look for a section named NAME. If 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 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 true, print an error if the core file doesn't have a |
| section by the appropriate name. Otherwise, just do nothing. */ |
| |
| void |
| core_target::get_core_register_section (struct regcache *regcache, |
| const struct regset *regset, |
| const char *name, |
| int section_min_size, |
| int which, |
| const char *human_name, |
| bool required) |
| { |
| struct bfd_section *section; |
| bfd_size_type size; |
| char *contents; |
| bool variable_size_section = (regset != NULL |
| && regset->flags & REGSET_VARIABLE_SIZE); |
| |
| thread_section_name section_name (name, regcache->ptid ()); |
| |
| section = bfd_get_section_by_name (core_bfd, section_name.c_str ()); |
| if (! section) |
| { |
| if (required) |
| warning (_("Couldn't find %s registers in core file."), |
| human_name); |
| return; |
| } |
| |
| size = bfd_section_size (section); |
| if (size < section_min_size) |
| { |
| warning (_("Section `%s' in core file too small."), |
| section_name.c_str ()); |
| return; |
| } |
| if (size != section_min_size && !variable_size_section) |
| { |
| warning (_("Unexpected size of section `%s' in core file."), |
| section_name.c_str ()); |
| } |
| |
| contents = (char *) 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, section_name.c_str ()); |
| return; |
| } |
| |
| if (regset != NULL) |
| { |
| regset->supply_regset (regset, regcache, -1, contents, size); |
| return; |
| } |
| |
| gdb_assert (m_core_vec != nullptr); |
| m_core_vec->core_read_registers (regcache, contents, size, which, |
| (CORE_ADDR) bfd_section_vma (section)); |
| } |
| |
| /* Data passed to gdbarch_iterate_over_regset_sections's callback. */ |
| struct get_core_registers_cb_data |
| { |
| core_target *target; |
| struct regcache *regcache; |
| }; |
| |
| /* 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 supply_size, int collect_size, |
| const struct regset *regset, |
| const char *human_name, void *cb_data) |
| { |
| auto *data = (get_core_registers_cb_data *) cb_data; |
| bool required = false; |
| bool variable_size_section = (regset != NULL |
| && regset->flags & REGSET_VARIABLE_SIZE); |
| |
| if (!variable_size_section) |
| gdb_assert (supply_size == collect_size); |
| |
| if (strcmp (sect_name, ".reg") == 0) |
| { |
| required = true; |
| 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. */ |
| data->target->get_core_register_section (data->regcache, regset, sect_name, |
| supply_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. */ |
| |
| void |
| core_target::fetch_registers (struct regcache *regcache, int regno) |
| { |
| int i; |
| struct gdbarch *gdbarch; |
| |
| if (!(m_core_gdbarch != nullptr |
| && gdbarch_iterate_over_regset_sections_p (m_core_gdbarch)) |
| && (m_core_vec == NULL || m_core_vec->core_read_registers == NULL)) |
| { |
| fprintf_filtered (gdb_stderr, |
| "Can't fetch registers from this type of core file\n"); |
| return; |
| } |
| |
| gdbarch = regcache->arch (); |
| if (gdbarch_iterate_over_regset_sections_p (gdbarch)) |
| { |
| get_core_registers_cb_data data = { this, regcache }; |
| gdbarch_iterate_over_regset_sections (gdbarch, |
| get_core_registers_cb, |
| (void *) &data, 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 (regcache->arch ()); i++) |
| if (regcache->get_register_status (i) == REG_UNKNOWN) |
| regcache->raw_supply (i, NULL); |
| } |
| |
| void |
| core_target::files_info () |
| { |
| print_section_info (&m_core_section_table, core_bfd); |
| } |
| |
| enum target_xfer_status |
| core_target::xfer_partial (enum target_object object, const char *annex, |
| gdb_byte *readbuf, const gdb_byte *writebuf, |
| ULONGEST offset, ULONGEST len, ULONGEST *xfered_len) |
| { |
| switch (object) |
| { |
| case TARGET_OBJECT_MEMORY: |
| return (section_table_xfer_memory_partial |
| (readbuf, writebuf, |
| offset, len, xfered_len, |
| m_core_section_table.sections, |
| m_core_section_table.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 (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 (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 (m_core_gdbarch != nullptr |
| && gdbarch_core_xfer_shared_libraries_p (m_core_gdbarch)) |
| { |
| if (writebuf) |
| return TARGET_XFER_E_IO; |
| else |
| { |
| *xfered_len = gdbarch_core_xfer_shared_libraries (m_core_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 (m_core_gdbarch != nullptr |
| && gdbarch_core_xfer_shared_libraries_aix_p (m_core_gdbarch)) |
| { |
| if (writebuf) |
| return TARGET_XFER_E_IO; |
| else |
| { |
| *xfered_len |
| = gdbarch_core_xfer_shared_libraries_aix (m_core_gdbarch, |
| readbuf, offset, |
| len); |
| |
| if (*xfered_len == 0) |
| return TARGET_XFER_EOF; |
| else |
| return TARGET_XFER_OK; |
| } |
| } |
| /* FALL THROUGH */ |
| |
| case TARGET_OBJECT_SIGNAL_INFO: |
| if (readbuf) |
| { |
| if (m_core_gdbarch != nullptr |
| && gdbarch_core_xfer_siginfo_p (m_core_gdbarch)) |
| { |
| LONGEST l = gdbarch_core_xfer_siginfo (m_core_gdbarch, readbuf, |
| offset, len); |
| |
| if (l >= 0) |
| { |
| *xfered_len = l; |
| if (l == 0) |
| return TARGET_XFER_EOF; |
| else |
| return TARGET_XFER_OK; |
| } |
| } |
| } |
| return TARGET_XFER_E_IO; |
| |
| default: |
| return this->beneath ()->xfer_partial (object, annex, readbuf, |
| writebuf, offset, len, |
| xfered_len); |
| } |
| } |
| |
| |
| |
| /* 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. |
| */ |
| bool |
| core_target::thread_alive (ptid_t ptid) |
| { |
| return true; |
| } |
| |
| /* 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_target. */ |
| |
| const struct target_desc * |
| core_target::read_description () |
| { |
| if (m_core_gdbarch && gdbarch_core_read_description_p (m_core_gdbarch)) |
| { |
| const struct target_desc *result; |
| |
| result = gdbarch_core_read_description (m_core_gdbarch, this, core_bfd); |
| if (result != NULL) |
| return result; |
| } |
| |
| return this->beneath ()->read_description (); |
| } |
| |
| std::string |
| core_target::pid_to_str (ptid_t ptid) |
| { |
| struct inferior *inf; |
| int pid; |
| |
| /* The preferred way is to have a gdbarch/OS specific |
| implementation. */ |
| if (m_core_gdbarch != nullptr |
| && gdbarch_core_pid_to_str_p (m_core_gdbarch)) |
| return gdbarch_core_pid_to_str (m_core_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.lwp (); |
| if (pid != 0) |
| return normal_pid_to_str (ptid_t (pid)); |
| |
| /* Otherwise, this isn't a "threaded" core -- use the PID field, but |
| only if it isn't a fake PID. */ |
| inf = find_inferior_ptid (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. */ |
| return "<main task>"; |
| } |
| |
| const char * |
| core_target::thread_name (struct thread_info *thr) |
| { |
| if (m_core_gdbarch != nullptr |
| && gdbarch_core_thread_name_p (m_core_gdbarch)) |
| return gdbarch_core_thread_name (m_core_gdbarch, thr); |
| return NULL; |
| } |
| |
| bool |
| core_target::has_memory () |
| { |
| return (core_bfd != NULL); |
| } |
| |
| bool |
| core_target::has_stack () |
| { |
| return (core_bfd != NULL); |
| } |
| |
| bool |
| core_target::has_registers () |
| { |
| return (core_bfd != NULL); |
| } |
| |
| /* Implement the to_info_proc method. */ |
| |
| bool |
| core_target::info_proc (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); |
| |
| return true; |
| } |
| |
| void |
| _initialize_corelow (void) |
| { |
| add_target (core_target_info, core_target_open, filename_completer); |
| } |