| /* Core dump and executable file functions above target vector, for GDB. |
| |
| Copyright (C) 1986-2021 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 <signal.h> |
| #include <fcntl.h> |
| #include "inferior.h" |
| #include "symtab.h" |
| #include "command.h" |
| #include "gdbcmd.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" |
| |
| /* You can have any number of hooks for `exec_file_command' command to |
| call. If there's only one hook, it is set in exec_file_display |
| hook. If there are two or more hooks, they are set in |
| exec_file_extra_hooks[], and deprecated_exec_file_display_hook is |
| set to a function that calls all of them. This extra complexity is |
| needed to preserve compatibility with old code that assumed that |
| only one hook could be set, and which called |
| deprecated_exec_file_display_hook directly. */ |
| |
| typedef void (*hook_type) (const char *); |
| |
| hook_type deprecated_exec_file_display_hook; /* The original hook. */ |
| static hook_type *exec_file_extra_hooks; /* Array of additional |
| hooks. */ |
| static int exec_file_hook_count = 0; /* Size of array. */ |
| |
| |
| |
| /* If there are two or more functions that wish to hook into |
| exec_file_command, this function will call all of the hook |
| functions. */ |
| |
| static void |
| call_extra_exec_file_hooks (const char *filename) |
| { |
| int i; |
| |
| for (i = 0; i < exec_file_hook_count; i++) |
| (*exec_file_extra_hooks[i]) (filename); |
| } |
| |
| /* Call this to specify the hook for exec_file_command to call back. |
| This is called from the x-window display code. */ |
| |
| void |
| specify_exec_file_hook (void (*hook) (const char *)) |
| { |
| hook_type *new_array; |
| |
| if (deprecated_exec_file_display_hook != NULL) |
| { |
| /* There's already a hook installed. Arrange to have both it |
| and the subsequent hooks called. */ |
| if (exec_file_hook_count == 0) |
| { |
| /* If this is the first extra hook, initialize the hook |
| array. */ |
| exec_file_extra_hooks = XNEW (hook_type); |
| exec_file_extra_hooks[0] = deprecated_exec_file_display_hook; |
| deprecated_exec_file_display_hook = call_extra_exec_file_hooks; |
| exec_file_hook_count = 1; |
| } |
| |
| /* Grow the hook array by one and add the new hook to the end. |
| Yes, it's inefficient to grow it by one each time but since |
| this is hardly ever called it's not a big deal. */ |
| exec_file_hook_count++; |
| new_array = (hook_type *) |
| xrealloc (exec_file_extra_hooks, |
| exec_file_hook_count * sizeof (hook_type)); |
| exec_file_extra_hooks = new_array; |
| exec_file_extra_hooks[exec_file_hook_count - 1] = hook; |
| } |
| else |
| deprecated_exec_file_display_hook = hook; |
| } |
| |
| void |
| reopen_exec_file (void) |
| { |
| int res; |
| struct stat st; |
| |
| /* Don't do anything if there isn't an exec file. */ |
| if (current_program_space->exec_bfd () == NULL) |
| return; |
| |
| /* If the timestamp of the exec file has changed, reopen it. */ |
| std::string filename = bfd_get_filename (current_program_space->exec_bfd ()); |
| res = stat (filename.c_str (), &st); |
| |
| if (res == 0 |
| && current_program_space->ebfd_mtime |
| && current_program_space->ebfd_mtime != st.st_mtime) |
| exec_file_attach (filename.c_str (), 0); |
| else |
| /* If we accessed the file since last opening it, close it now; |
| this stops GDB from holding the executable open after it |
| exits. */ |
| bfd_cache_close_all (); |
| } |
| |
| /* 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 () && core_bfd) |
| { |
| if (!core_file_matches_executable_p (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 (core_bfd)) |
| warning (_("exec file is newer than core file.")); |
| } |
| } |
| |
| /* See gdbsupport/common-inferior.h. */ |
| |
| const char * |
| get_exec_file (int err) |
| { |
| if (current_program_space->exec_filename != nullptr) |
| return current_program_space->exec_filename.get (); |
| if (!err) |
| return NULL; |
| |
| error (_("No executable file specified.\n\ |
| Use the \"file\" or \"exec-file\" command.")); |
| } |
| |
| |
| 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 (__FILE__, __LINE__, |
| "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, target_gdbarch (), 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 (type)); |
| |
| read_memory (addr, buf, TYPE_LENGTH (type)); |
| 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); |
| } |
| |
| /* 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); |
| gdb::observers::memory_changed.notify (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) |
| { |
| fprintf_filtered (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, 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"); |
| } |