| /* Core dump and executable file functions above target vector, for GDB. |
| |
| Copyright (C) 1986, 1987, 1989, 1991, 1992, 1993, 1994, 1996, 1997, 1998, |
| 1999, 2000, 2001, 2003, 2006, 2007, 2008, 2009 |
| 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 "gdb_string.h" |
| #include <errno.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 "gdb_stat.h" |
| #include "completer.h" |
| #include "exceptions.h" |
| |
| /* Local function declarations. */ |
| |
| extern void _initialize_core (void); |
| static void call_extra_exec_file_hooks (char *filename); |
| |
| /* 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) (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 */ |
| |
| /* Binary file diddling handle for the core file. */ |
| |
| bfd *core_bfd = NULL; |
| |
| |
| /* Backward compatability with old way of specifying core files. */ |
| |
| void |
| core_file_command (char *filename, int from_tty) |
| { |
| struct target_ops *t; |
| |
| dont_repeat (); /* Either way, seems bogus. */ |
| |
| t = find_core_target (); |
| if (t == NULL) |
| error (_("GDB can't read core files on this machine.")); |
| |
| if (!filename) |
| (t->to_detach) (t, filename, from_tty); |
| else |
| (t->to_open) (filename, from_tty); |
| } |
| |
| |
| /* 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 (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) (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 = (hook_type *) xmalloc (sizeof (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; |
| } |
| |
| /* The exec file must be closed before running an inferior. |
| If it is needed again after the inferior dies, it must |
| be reopened. */ |
| |
| void |
| close_exec_file (void) |
| { |
| #if 0 /* FIXME */ |
| if (exec_bfd) |
| bfd_tempclose (exec_bfd); |
| #endif |
| } |
| |
| void |
| reopen_exec_file (void) |
| { |
| #if 0 /* FIXME */ |
| if (exec_bfd) |
| bfd_reopen (exec_bfd); |
| #else |
| char *filename; |
| int res; |
| struct stat st; |
| long mtime; |
| struct cleanup *cleanups; |
| |
| /* Don't do anything if there isn't an exec file. */ |
| if (exec_bfd == NULL) |
| return; |
| |
| /* If the timestamp of the exec file has changed, reopen it. */ |
| filename = xstrdup (bfd_get_filename (exec_bfd)); |
| cleanups = make_cleanup (xfree, filename); |
| res = stat (filename, &st); |
| |
| if (exec_bfd_mtime && exec_bfd_mtime != st.st_mtime) |
| exec_file_attach (filename, 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 (); |
| |
| do_cleanups (cleanups); |
| #endif |
| } |
| |
| /* 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 (exec_bfd && core_bfd) |
| { |
| if (!core_file_matches_executable_p (core_bfd, exec_bfd)) |
| warning (_("core file may not match specified executable file.")); |
| else if (bfd_get_mtime (exec_bfd) > bfd_get_mtime (core_bfd)) |
| warning (_("exec file is newer than core file.")); |
| } |
| } |
| |
| /* Return the name of the executable file as a string. |
| ERR nonzero means get error if there is none specified; |
| otherwise return 0 in that case. */ |
| |
| char * |
| get_exec_file (int err) |
| { |
| if (exec_bfd) |
| return bfd_get_filename (exec_bfd); |
| if (!err) |
| return NULL; |
| |
| error (_("No executable file specified.\n\ |
| Use the \"file\" or \"exec-file\" command.")); |
| return NULL; |
| } |
| |
| |
| /* Report a memory error by throwing a MEMORY_ERROR error. */ |
| |
| void |
| memory_error (int status, CORE_ADDR memaddr) |
| { |
| if (status == EIO) |
| /* Actually, address between memaddr and memaddr + len was out of |
| bounds. */ |
| throw_error (MEMORY_ERROR, |
| _("Cannot access memory at address %s"), |
| paddress (memaddr)); |
| else |
| throw_error (MEMORY_ERROR, |
| _("Error accessing memory address %s: %s."), |
| paddress (memaddr), |
| safe_strerror (status)); |
| } |
| |
| /* Same as target_read_memory, but report an error if can't read. */ |
| void |
| read_memory (CORE_ADDR memaddr, gdb_byte *myaddr, int len) |
| { |
| int status; |
| status = target_read_memory (memaddr, myaddr, len); |
| if (status != 0) |
| memory_error (status, memaddr); |
| } |
| |
| /* Argument / return result struct for use with |
| do_captured_read_memory_integer(). MEMADDR and LEN are filled in |
| by gdb_read_memory_integer(). RESULT is the contents that were |
| successfully read from MEMADDR of length LEN. */ |
| |
| struct captured_read_memory_integer_arguments |
| { |
| CORE_ADDR memaddr; |
| int len; |
| LONGEST result; |
| }; |
| |
| /* Helper function for gdb_read_memory_integer(). DATA must be a |
| pointer to a captured_read_memory_integer_arguments struct. |
| Return 1 if successful. Note that the catch_errors() interface |
| will return 0 if an error occurred while reading memory. This |
| choice of return code is so that we can distinguish between |
| success and failure. */ |
| |
| static int |
| do_captured_read_memory_integer (void *data) |
| { |
| struct captured_read_memory_integer_arguments *args = (struct captured_read_memory_integer_arguments*) data; |
| CORE_ADDR memaddr = args->memaddr; |
| int len = args->len; |
| |
| args->result = read_memory_integer (memaddr, len); |
| |
| 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_integer (CORE_ADDR memaddr, int len, LONGEST *return_value) |
| { |
| int status; |
| struct captured_read_memory_integer_arguments args; |
| args.memaddr = memaddr; |
| args.len = len; |
| |
| status = catch_errors (do_captured_read_memory_integer, &args, |
| "", RETURN_MASK_ALL); |
| if (status) |
| *return_value = args.result; |
| |
| return status; |
| } |
| |
| LONGEST |
| read_memory_integer (CORE_ADDR memaddr, int len) |
| { |
| gdb_byte buf[sizeof (LONGEST)]; |
| |
| read_memory (memaddr, buf, len); |
| return extract_signed_integer (buf, len); |
| } |
| |
| ULONGEST |
| read_memory_unsigned_integer (CORE_ADDR memaddr, int len) |
| { |
| gdb_byte buf[sizeof (ULONGEST)]; |
| |
| read_memory (memaddr, buf, len); |
| return extract_unsigned_integer (buf, len); |
| } |
| |
| void |
| read_memory_string (CORE_ADDR memaddr, char *buffer, int max_len) |
| { |
| char *cp; |
| int i; |
| int cnt; |
| |
| cp = buffer; |
| while (1) |
| { |
| if (cp - buffer >= max_len) |
| { |
| buffer[max_len - 1] = '\0'; |
| break; |
| } |
| cnt = max_len - (cp - buffer); |
| if (cnt > 8) |
| cnt = 8; |
| read_memory (memaddr + (int) (cp - buffer), cp, cnt); |
| for (i = 0; i < cnt && *cp; i++, cp++) |
| ; /* null body */ |
| |
| if (i < cnt && !*cp) |
| break; |
| } |
| } |
| |
| CORE_ADDR |
| read_memory_typed_address (CORE_ADDR addr, struct type *type) |
| { |
| gdb_byte *buf = alloca (TYPE_LENGTH (type)); |
| read_memory (addr, buf, TYPE_LENGTH (type)); |
| return extract_typed_address (buf, type); |
| } |
| |
| /* Same as target_write_memory, but report an error if can't write. */ |
| void |
| write_memory (CORE_ADDR memaddr, const bfd_byte *myaddr, int len) |
| { |
| int status; |
| status = target_write_memory (memaddr, myaddr, len); |
| if (status != 0) |
| memory_error (status, memaddr); |
| } |
| |
| /* Store VALUE at ADDR in the inferior as a LEN-byte unsigned integer. */ |
| void |
| write_memory_unsigned_integer (CORE_ADDR addr, int len, ULONGEST value) |
| { |
| gdb_byte *buf = alloca (len); |
| store_unsigned_integer (buf, len, 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, LONGEST value) |
| { |
| gdb_byte *buf = alloca (len); |
| store_signed_integer (buf, len, value); |
| write_memory (addr, buf, len); |
| } |
| |
| /* The current default bfd target. Points to storage allocated for |
| gnutarget_string. */ |
| char *gnutarget; |
| |
| /* Same thing, except it is "auto" not NULL for the default case. */ |
| static char *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 (char *, int, struct cmd_list_element *); |
| |
| static void |
| set_gnutarget_command (char *ignore, int from_tty, struct cmd_list_element *c) |
| { |
| if (strcmp (gnutarget_string, "auto") == 0) |
| gnutarget = NULL; |
| else |
| gnutarget = gnutarget_string; |
| } |
| |
| /* Set the gnutarget. */ |
| void |
| set_gnutarget (char *newtarget) |
| { |
| if (gnutarget_string != NULL) |
| xfree (gnutarget_string); |
| gnutarget_string = xstrdup (newtarget); |
| set_gnutarget_command (NULL, 0, NULL); |
| } |
| |
| void |
| _initialize_core (void) |
| { |
| struct cmd_list_element *c; |
| c = add_cmd ("core-file", class_files, core_file_command, _("\ |
| Use FILE as core dump for examining memory and registers.\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 (c, filename_completer); |
| |
| |
| 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); |
| |
| if (getenv ("GNUTARGET")) |
| set_gnutarget (getenv ("GNUTARGET")); |
| else |
| set_gnutarget ("auto"); |
| } |