| /* Core dump and executable file functions above target vector, for GDB. |
| |
| Copyright (C) 1986-2024 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 <signal.h> |
| #include <fcntl.h> |
| #include "event-top.h" |
| #include "extract-store-integer.h" |
| #include "inferior.h" |
| #include "symtab.h" |
| #include "command.h" |
| #include "cli/cli-cmds.h" |
| #include "bfd.h" |
| #include "target.h" |
| #include "gdbcore.h" |
| #include "dis-asm.h" |
| #include <sys/stat.h> |
| #include "completer.h" |
| #include "observable.h" |
| #include "cli/cli-utils.h" |
| #include "gdbarch.h" |
| #include "interps.h" |
| |
| void |
| reopen_exec_file (void) |
| { |
| bfd *exec_bfd = current_program_space->exec_bfd (); |
| |
| /* Don't do anything if there isn't an exec file. */ |
| if (exec_bfd == nullptr) |
| return; |
| |
| /* The main executable can't be an in-memory BFD object. If it was then |
| the use of bfd_stat below would not work as expected. */ |
| gdb_assert ((exec_bfd->flags & BFD_IN_MEMORY) == 0); |
| |
| /* If the timestamp of the exec file has changed, reopen it. */ |
| struct stat st; |
| int res = bfd_stat (exec_bfd, &st); |
| |
| if (res == 0 |
| && current_program_space->ebfd_mtime != 0 |
| && current_program_space->ebfd_mtime != st.st_mtime) |
| exec_file_attach (bfd_get_filename (exec_bfd), 0); |
| } |
| |
| /* If we have both a core file and an exec file, |
| print a warning if they don't go together. */ |
| |
| void |
| validate_files (void) |
| { |
| if (current_program_space->exec_bfd () && current_program_space->core_bfd ()) |
| { |
| if (!core_file_matches_executable_p (current_program_space->core_bfd (), |
| current_program_space->exec_bfd ())) |
| warning (_("core file may not match specified executable file.")); |
| else if (bfd_get_mtime (current_program_space->exec_bfd ()) |
| > bfd_get_mtime (current_program_space->core_bfd ())) |
| warning (_("exec file is newer than core file.")); |
| } |
| } |
| |
| std::string |
| memory_error_message (enum target_xfer_status err, |
| struct gdbarch *gdbarch, CORE_ADDR memaddr) |
| { |
| switch (err) |
| { |
| case TARGET_XFER_E_IO: |
| /* Actually, address between memaddr and memaddr + len was out of |
| bounds. */ |
| return string_printf (_("Cannot access memory at address %s"), |
| paddress (gdbarch, memaddr)); |
| case TARGET_XFER_UNAVAILABLE: |
| return string_printf (_("Memory at address %s unavailable."), |
| paddress (gdbarch, memaddr)); |
| default: |
| internal_error ("unhandled target_xfer_status: %s (%s)", |
| target_xfer_status_to_string (err), |
| plongest (err)); |
| } |
| } |
| |
| /* Report a memory error by throwing a suitable exception. */ |
| |
| void |
| memory_error (enum target_xfer_status err, CORE_ADDR memaddr) |
| { |
| enum errors exception = GDB_NO_ERROR; |
| |
| /* Build error string. */ |
| std::string str |
| = memory_error_message (err, current_inferior ()->arch (), memaddr); |
| |
| /* Choose the right error to throw. */ |
| switch (err) |
| { |
| case TARGET_XFER_E_IO: |
| exception = MEMORY_ERROR; |
| break; |
| case TARGET_XFER_UNAVAILABLE: |
| exception = NOT_AVAILABLE_ERROR; |
| break; |
| } |
| |
| /* Throw it. */ |
| throw_error (exception, ("%s"), str.c_str ()); |
| } |
| |
| /* Helper function. */ |
| |
| static void |
| read_memory_object (enum target_object object, CORE_ADDR memaddr, |
| gdb_byte *myaddr, ssize_t len) |
| { |
| ULONGEST xfered = 0; |
| |
| while (xfered < len) |
| { |
| enum target_xfer_status status; |
| ULONGEST xfered_len; |
| |
| status = target_xfer_partial (current_inferior ()->top_target (), object, |
| NULL, myaddr + xfered, NULL, |
| memaddr + xfered, len - xfered, |
| &xfered_len); |
| |
| if (status != TARGET_XFER_OK) |
| memory_error (status == TARGET_XFER_EOF ? TARGET_XFER_E_IO : status, |
| memaddr + xfered); |
| |
| xfered += xfered_len; |
| QUIT; |
| } |
| } |
| |
| /* Same as target_read_memory, but report an error if can't read. */ |
| |
| void |
| read_memory (CORE_ADDR memaddr, gdb_byte *myaddr, ssize_t len) |
| { |
| read_memory_object (TARGET_OBJECT_MEMORY, memaddr, myaddr, len); |
| } |
| |
| /* Same as target_read_stack, but report an error if can't read. */ |
| |
| void |
| read_stack (CORE_ADDR memaddr, gdb_byte *myaddr, ssize_t len) |
| { |
| read_memory_object (TARGET_OBJECT_STACK_MEMORY, memaddr, myaddr, len); |
| } |
| |
| /* Same as target_read_code, but report an error if can't read. */ |
| |
| void |
| read_code (CORE_ADDR memaddr, gdb_byte *myaddr, ssize_t len) |
| { |
| read_memory_object (TARGET_OBJECT_CODE_MEMORY, memaddr, myaddr, len); |
| } |
| |
| /* Read memory at MEMADDR of length LEN and put the contents in |
| RETURN_VALUE. Return 0 if MEMADDR couldn't be read and non-zero |
| if successful. */ |
| |
| int |
| safe_read_memory_integer (CORE_ADDR memaddr, int len, |
| enum bfd_endian byte_order, |
| LONGEST *return_value) |
| { |
| gdb_byte buf[sizeof (LONGEST)]; |
| |
| if (target_read_memory (memaddr, buf, len)) |
| return 0; |
| |
| *return_value = extract_signed_integer (buf, len, byte_order); |
| return 1; |
| } |
| |
| /* Read memory at MEMADDR of length LEN and put the contents in |
| RETURN_VALUE. Return 0 if MEMADDR couldn't be read and non-zero |
| if successful. */ |
| |
| int |
| safe_read_memory_unsigned_integer (CORE_ADDR memaddr, int len, |
| enum bfd_endian byte_order, |
| ULONGEST *return_value) |
| { |
| gdb_byte buf[sizeof (ULONGEST)]; |
| |
| if (target_read_memory (memaddr, buf, len)) |
| return 0; |
| |
| *return_value = extract_unsigned_integer (buf, len, byte_order); |
| return 1; |
| } |
| |
| LONGEST |
| read_memory_integer (CORE_ADDR memaddr, int len, |
| enum bfd_endian byte_order) |
| { |
| gdb_byte buf[sizeof (LONGEST)]; |
| |
| read_memory (memaddr, buf, len); |
| return extract_signed_integer (buf, len, byte_order); |
| } |
| |
| ULONGEST |
| read_memory_unsigned_integer (CORE_ADDR memaddr, int len, |
| enum bfd_endian byte_order) |
| { |
| gdb_byte buf[sizeof (ULONGEST)]; |
| |
| read_memory (memaddr, buf, len); |
| return extract_unsigned_integer (buf, len, byte_order); |
| } |
| |
| LONGEST |
| read_code_integer (CORE_ADDR memaddr, int len, |
| enum bfd_endian byte_order) |
| { |
| gdb_byte buf[sizeof (LONGEST)]; |
| |
| read_code (memaddr, buf, len); |
| return extract_signed_integer (buf, len, byte_order); |
| } |
| |
| ULONGEST |
| read_code_unsigned_integer (CORE_ADDR memaddr, int len, |
| enum bfd_endian byte_order) |
| { |
| gdb_byte buf[sizeof (ULONGEST)]; |
| |
| read_code (memaddr, buf, len); |
| return extract_unsigned_integer (buf, len, byte_order); |
| } |
| |
| CORE_ADDR |
| read_memory_typed_address (CORE_ADDR addr, struct type *type) |
| { |
| gdb_byte *buf = (gdb_byte *) alloca (type->length ()); |
| |
| read_memory (addr, buf, type->length ()); |
| return extract_typed_address (buf, type); |
| } |
| |
| /* See gdbcore.h. */ |
| |
| void |
| write_memory (CORE_ADDR memaddr, |
| const bfd_byte *myaddr, ssize_t len) |
| { |
| int status; |
| |
| status = target_write_memory (memaddr, myaddr, len); |
| if (status != 0) |
| memory_error (TARGET_XFER_E_IO, memaddr); |
| } |
| |
| /* Notify interpreters and observers that INF's memory was changed. */ |
| |
| static void |
| notify_memory_changed (inferior *inf, CORE_ADDR addr, ssize_t len, |
| const bfd_byte *data) |
| { |
| interps_notify_memory_changed (inf, addr, len, data); |
| gdb::observers::memory_changed.notify (inf, addr, len, data); |
| } |
| |
| /* Same as write_memory, but notify 'memory_changed' observers. */ |
| |
| void |
| write_memory_with_notification (CORE_ADDR memaddr, const bfd_byte *myaddr, |
| ssize_t len) |
| { |
| write_memory (memaddr, myaddr, len); |
| notify_memory_changed (current_inferior (), memaddr, len, myaddr); |
| } |
| |
| /* Store VALUE at ADDR in the inferior as a LEN-byte unsigned |
| integer. */ |
| void |
| write_memory_unsigned_integer (CORE_ADDR addr, int len, |
| enum bfd_endian byte_order, |
| ULONGEST value) |
| { |
| gdb_byte *buf = (gdb_byte *) alloca (len); |
| |
| store_unsigned_integer (buf, len, byte_order, value); |
| write_memory (addr, buf, len); |
| } |
| |
| /* Store VALUE at ADDR in the inferior as a LEN-byte signed |
| integer. */ |
| void |
| write_memory_signed_integer (CORE_ADDR addr, int len, |
| enum bfd_endian byte_order, |
| LONGEST value) |
| { |
| gdb_byte *buf = (gdb_byte *) alloca (len); |
| |
| store_signed_integer (buf, len, byte_order, value); |
| write_memory (addr, buf, len); |
| } |
| |
| /* The current default bfd target. Points to storage allocated for |
| gnutarget_string. */ |
| const char *gnutarget; |
| |
| /* Same thing, except it is "auto" not NULL for the default case. */ |
| static std::string gnutarget_string; |
| static void |
| show_gnutarget_string (struct ui_file *file, int from_tty, |
| struct cmd_list_element *c, |
| const char *value) |
| { |
| gdb_printf (file, |
| _("The current BFD target is \"%s\".\n"), value); |
| } |
| |
| static void |
| set_gnutarget_command (const char *ignore, int from_tty, |
| struct cmd_list_element *c) |
| { |
| const char *gend = gnutarget_string.c_str () + gnutarget_string.size (); |
| gend = remove_trailing_whitespace (gnutarget_string.c_str (), gend); |
| gnutarget_string |
| = gnutarget_string.substr (0, gend - gnutarget_string.data ()); |
| |
| if (gnutarget_string == "auto") |
| gnutarget = NULL; |
| else |
| gnutarget = gnutarget_string.c_str (); |
| } |
| |
| /* A completion function for "set gnutarget". */ |
| |
| static void |
| complete_set_gnutarget (struct cmd_list_element *cmd, |
| completion_tracker &tracker, |
| const char *text, const char *word) |
| { |
| static const char **bfd_targets; |
| |
| if (bfd_targets == NULL) |
| { |
| int last; |
| |
| bfd_targets = bfd_target_list (); |
| for (last = 0; bfd_targets[last] != NULL; ++last) |
| ; |
| |
| bfd_targets = XRESIZEVEC (const char *, bfd_targets, last + 2); |
| bfd_targets[last] = "auto"; |
| bfd_targets[last + 1] = NULL; |
| } |
| |
| complete_on_enum (tracker, bfd_targets, text, word); |
| } |
| |
| /* Set the gnutarget. */ |
| void |
| set_gnutarget (const char *newtarget) |
| { |
| gnutarget_string = newtarget; |
| set_gnutarget_command (NULL, 0, NULL); |
| } |
| |
| void _initialize_core (); |
| void |
| _initialize_core () |
| { |
| cmd_list_element *core_file_cmd |
| = add_cmd ("core-file", class_files, core_file_command, _("\ |
| Use FILE as core dump for examining memory and registers.\n\ |
| Usage: core-file FILE\n\ |
| No arg means have no core file. This command has been superseded by the\n\ |
| `target core' and `detach' commands."), &cmdlist); |
| set_cmd_completer (core_file_cmd, deprecated_filename_completer); |
| |
| set_show_commands set_show_gnutarget |
| = add_setshow_string_noescape_cmd ("gnutarget", class_files, |
| &gnutarget_string, _("\ |
| Set the current BFD target."), _("\ |
| Show the current BFD target."), _("\ |
| Use `set gnutarget auto' to specify automatic detection."), |
| set_gnutarget_command, |
| show_gnutarget_string, |
| &setlist, &showlist); |
| set_cmd_completer (set_show_gnutarget.set, complete_set_gnutarget); |
| |
| add_alias_cmd ("g", set_show_gnutarget.set, class_files, 1, &setlist); |
| |
| if (getenv ("GNUTARGET")) |
| set_gnutarget (getenv ("GNUTARGET")); |
| else |
| set_gnutarget ("auto"); |
| } |