757 lines
22 KiB
C
757 lines
22 KiB
C
/* Work with executable files, for GDB.
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Copyright (C) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997,
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1998, 1999, 2000, 2001, 2002, 2003, 2007, 2008
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Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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#include "frame.h"
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#include "inferior.h"
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#include "target.h"
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#include "gdbcmd.h"
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#include "language.h"
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#include "symfile.h"
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#include "objfiles.h"
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#include "completer.h"
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#include "value.h"
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#include "exec.h"
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#include "observer.h"
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#include "arch-utils.h"
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#include <fcntl.h>
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#include "readline/readline.h"
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#include "gdb_string.h"
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#include "gdbcore.h"
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#include <ctype.h>
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#include "gdb_stat.h"
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#include "xcoffsolib.h"
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struct vmap *map_vmap (bfd *, bfd *);
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void (*deprecated_file_changed_hook) (char *);
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/* Prototypes for local functions */
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static void exec_close (int);
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static void file_command (char *, int);
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static void set_section_command (char *, int);
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static void exec_files_info (struct target_ops *);
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static void init_exec_ops (void);
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void _initialize_exec (void);
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/* The target vector for executable files. */
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struct target_ops exec_ops;
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/* The Binary File Descriptor handle for the executable file. */
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bfd *exec_bfd = NULL;
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long exec_bfd_mtime = 0;
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/* Whether to open exec and core files read-only or read-write. */
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int write_files = 0;
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static void
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show_write_files (struct ui_file *file, int from_tty,
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struct cmd_list_element *c, const char *value)
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{
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fprintf_filtered (file, _("Writing into executable and core files is %s.\n"),
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value);
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}
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struct vmap *vmap;
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static void
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exec_open (char *args, int from_tty)
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{
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target_preopen (from_tty);
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exec_file_attach (args, from_tty);
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}
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static void
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exec_close (int quitting)
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{
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int need_symtab_cleanup = 0;
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struct vmap *vp, *nxt;
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for (nxt = vmap; nxt != NULL;)
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{
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vp = nxt;
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nxt = vp->nxt;
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/* if there is an objfile associated with this bfd,
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free_objfile() will do proper cleanup of objfile *and* bfd. */
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if (vp->objfile)
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{
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free_objfile (vp->objfile);
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need_symtab_cleanup = 1;
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}
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else if (vp->bfd != exec_bfd)
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/* FIXME-leak: We should be freeing vp->name too, I think. */
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if (!bfd_close (vp->bfd))
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warning (_("cannot close \"%s\": %s"),
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vp->name, bfd_errmsg (bfd_get_error ()));
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/* FIXME: This routine is #if 0'd in symfile.c. What should we
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be doing here? Should we just free everything in
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vp->objfile->symtabs? Should free_objfile do that?
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FIXME-as-well: free_objfile already free'd vp->name, so it isn't
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valid here. */
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free_named_symtabs (vp->name);
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xfree (vp);
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}
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vmap = NULL;
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if (exec_bfd)
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{
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char *name = bfd_get_filename (exec_bfd);
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if (!bfd_close (exec_bfd))
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warning (_("cannot close \"%s\": %s"),
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name, bfd_errmsg (bfd_get_error ()));
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xfree (name);
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exec_bfd = NULL;
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exec_bfd_mtime = 0;
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}
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if (exec_ops.to_sections)
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{
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xfree (exec_ops.to_sections);
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exec_ops.to_sections = NULL;
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exec_ops.to_sections_end = NULL;
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}
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}
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void
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exec_file_clear (int from_tty)
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{
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/* Remove exec file. */
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unpush_target (&exec_ops);
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if (from_tty)
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printf_unfiltered (_("No executable file now.\n"));
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}
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/* Process the first arg in ARGS as the new exec file.
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This function is intended to be behave essentially the same
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as exec_file_command, except that the latter will detect when
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a target is being debugged, and will ask the user whether it
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should be shut down first. (If the answer is "no", then the
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new file is ignored.)
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This file is used by exec_file_command, to do the work of opening
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and processing the exec file after any prompting has happened.
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And, it is used by child_attach, when the attach command was
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given a pid but not a exec pathname, and the attach command could
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figure out the pathname from the pid. (In this case, we shouldn't
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ask the user whether the current target should be shut down --
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we're supplying the exec pathname late for good reason.)
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ARGS is assumed to be the filename. */
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void
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exec_file_attach (char *filename, int from_tty)
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{
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/* Remove any previous exec file. */
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unpush_target (&exec_ops);
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/* Now open and digest the file the user requested, if any. */
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if (!filename)
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{
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if (from_tty)
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printf_unfiltered (_("No executable file now.\n"));
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set_gdbarch_from_file (NULL);
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}
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else
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{
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char *scratch_pathname;
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int scratch_chan;
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scratch_chan = openp (getenv ("PATH"), OPF_TRY_CWD_FIRST, filename,
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write_files ? O_RDWR | O_BINARY : O_RDONLY | O_BINARY, 0,
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&scratch_pathname);
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#if defined(__GO32__) || defined(_WIN32) || defined(__CYGWIN__)
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if (scratch_chan < 0)
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{
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char *exename = alloca (strlen (filename) + 5);
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strcat (strcpy (exename, filename), ".exe");
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scratch_chan = openp (getenv ("PATH"), OPF_TRY_CWD_FIRST, exename,
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write_files ? O_RDWR | O_BINARY : O_RDONLY | O_BINARY, 0,
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&scratch_pathname);
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}
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#endif
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if (scratch_chan < 0)
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perror_with_name (filename);
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exec_bfd = bfd_fopen (scratch_pathname, gnutarget,
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write_files ? FOPEN_RUB : FOPEN_RB,
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scratch_chan);
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if (!exec_bfd)
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error (_("\"%s\": could not open as an executable file: %s"),
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scratch_pathname, bfd_errmsg (bfd_get_error ()));
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/* At this point, scratch_pathname and exec_bfd->name both point to the
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same malloc'd string. However exec_close() will attempt to free it
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via the exec_bfd->name pointer, so we need to make another copy and
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leave exec_bfd as the new owner of the original copy. */
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scratch_pathname = xstrdup (scratch_pathname);
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make_cleanup (xfree, scratch_pathname);
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if (!bfd_check_format (exec_bfd, bfd_object))
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{
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/* Make sure to close exec_bfd, or else "run" might try to use
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it. */
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exec_close (0);
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error (_("\"%s\": not in executable format: %s"),
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scratch_pathname, bfd_errmsg (bfd_get_error ()));
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}
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/* FIXME - This should only be run for RS6000, but the ifdef is a poor
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way to accomplish. */
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#ifdef DEPRECATED_IBM6000_TARGET
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/* Setup initial vmap. */
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map_vmap (exec_bfd, 0);
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if (vmap == NULL)
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{
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/* Make sure to close exec_bfd, or else "run" might try to use
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it. */
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exec_close (0);
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error (_("\"%s\": can't find the file sections: %s"),
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scratch_pathname, bfd_errmsg (bfd_get_error ()));
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}
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#endif /* DEPRECATED_IBM6000_TARGET */
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if (build_section_table (exec_bfd, &exec_ops.to_sections,
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&exec_ops.to_sections_end))
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{
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/* Make sure to close exec_bfd, or else "run" might try to use
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it. */
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exec_close (0);
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error (_("\"%s\": can't find the file sections: %s"),
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scratch_pathname, bfd_errmsg (bfd_get_error ()));
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}
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exec_bfd_mtime = bfd_get_mtime (exec_bfd);
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validate_files ();
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set_gdbarch_from_file (exec_bfd);
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push_target (&exec_ops);
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/* Tell display code (if any) about the changed file name. */
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if (deprecated_exec_file_display_hook)
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(*deprecated_exec_file_display_hook) (filename);
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}
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bfd_cache_close_all ();
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observer_notify_executable_changed (NULL);
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}
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/* Process the first arg in ARGS as the new exec file.
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Note that we have to explicitly ignore additional args, since we can
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be called from file_command(), which also calls symbol_file_command()
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which can take multiple args.
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If ARGS is NULL, we just want to close the exec file. */
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static void
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exec_file_command (char *args, int from_tty)
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{
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char **argv;
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char *filename;
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if (from_tty && target_has_execution
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&& !query (_("A program is being debugged already.\n"
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"Are you sure you want to change the file? ")))
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error (_("File not changed."));
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if (args)
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{
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/* Scan through the args and pick up the first non option arg
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as the filename. */
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argv = buildargv (args);
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if (argv == NULL)
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nomem (0);
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make_cleanup_freeargv (argv);
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for (; (*argv != NULL) && (**argv == '-'); argv++)
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{;
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}
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if (*argv == NULL)
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error (_("No executable file name was specified"));
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filename = tilde_expand (*argv);
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make_cleanup (xfree, filename);
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exec_file_attach (filename, from_tty);
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}
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else
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exec_file_attach (NULL, from_tty);
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}
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/* Set both the exec file and the symbol file, in one command.
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What a novelty. Why did GDB go through four major releases before this
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command was added? */
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static void
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file_command (char *arg, int from_tty)
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{
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/* FIXME, if we lose on reading the symbol file, we should revert
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the exec file, but that's rough. */
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exec_file_command (arg, from_tty);
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symbol_file_command (arg, from_tty);
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if (deprecated_file_changed_hook)
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deprecated_file_changed_hook (arg);
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}
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/* Locate all mappable sections of a BFD file.
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table_pp_char is a char * to get it through bfd_map_over_sections;
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we cast it back to its proper type. */
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static void
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add_to_section_table (bfd *abfd, struct bfd_section *asect,
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void *table_pp_char)
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{
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struct section_table **table_pp = (struct section_table **) table_pp_char;
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flagword aflag;
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/* Check the section flags, but do not discard zero-length sections, since
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some symbols may still be attached to this section. For instance, we
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encountered on sparc-solaris 2.10 a shared library with an empty .bss
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section to which a symbol named "_end" was attached. The address
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of this symbol still needs to be relocated. */
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aflag = bfd_get_section_flags (abfd, asect);
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if (!(aflag & SEC_ALLOC))
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return;
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(*table_pp)->bfd = abfd;
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(*table_pp)->the_bfd_section = asect;
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(*table_pp)->addr = bfd_section_vma (abfd, asect);
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(*table_pp)->endaddr = (*table_pp)->addr + bfd_section_size (abfd, asect);
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(*table_pp)++;
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}
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/* Builds a section table, given args BFD, SECTABLE_PTR, SECEND_PTR.
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Returns 0 if OK, 1 on error. */
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int
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build_section_table (struct bfd *some_bfd, struct section_table **start,
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struct section_table **end)
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{
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unsigned count;
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count = bfd_count_sections (some_bfd);
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if (*start)
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xfree (* start);
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*start = (struct section_table *) xmalloc (count * sizeof (**start));
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*end = *start;
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bfd_map_over_sections (some_bfd, add_to_section_table, (char *) end);
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if (*end > *start + count)
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internal_error (__FILE__, __LINE__, _("failed internal consistency check"));
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/* We could realloc the table, but it probably loses for most files. */
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return 0;
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}
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static void
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bfdsec_to_vmap (struct bfd *abfd, struct bfd_section *sect, void *arg3)
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{
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struct vmap_and_bfd *vmap_bfd = (struct vmap_and_bfd *) arg3;
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struct vmap *vp;
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vp = vmap_bfd->pvmap;
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if ((bfd_get_section_flags (abfd, sect) & SEC_LOAD) == 0)
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return;
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if (strcmp (bfd_section_name (abfd, sect), ".text") == 0)
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{
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vp->tstart = bfd_section_vma (abfd, sect);
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vp->tend = vp->tstart + bfd_section_size (abfd, sect);
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vp->tvma = bfd_section_vma (abfd, sect);
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vp->toffs = sect->filepos;
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}
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else if (strcmp (bfd_section_name (abfd, sect), ".data") == 0)
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{
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vp->dstart = bfd_section_vma (abfd, sect);
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vp->dend = vp->dstart + bfd_section_size (abfd, sect);
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vp->dvma = bfd_section_vma (abfd, sect);
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}
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/* Silently ignore other types of sections. (FIXME?) */
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}
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/* Make a vmap for ABFD which might be a member of the archive ARCH.
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Return the new vmap. */
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struct vmap *
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map_vmap (bfd *abfd, bfd *arch)
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{
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struct vmap_and_bfd vmap_bfd;
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struct vmap *vp, **vpp;
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vp = (struct vmap *) xmalloc (sizeof (*vp));
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memset ((char *) vp, '\0', sizeof (*vp));
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vp->nxt = 0;
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vp->bfd = abfd;
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vp->name = bfd_get_filename (arch ? arch : abfd);
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vp->member = arch ? bfd_get_filename (abfd) : "";
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vmap_bfd.pbfd = arch;
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vmap_bfd.pvmap = vp;
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bfd_map_over_sections (abfd, bfdsec_to_vmap, &vmap_bfd);
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/* Find the end of the list and append. */
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for (vpp = &vmap; *vpp; vpp = &(*vpp)->nxt)
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;
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*vpp = vp;
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return vp;
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}
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/* Read or write the exec file.
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Args are address within a BFD file, address within gdb address-space,
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length, and a flag indicating whether to read or write.
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Result is a length:
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0: We cannot handle this address and length.
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> 0: We have handled N bytes starting at this address.
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(If N == length, we did it all.) We might be able
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to handle more bytes beyond this length, but no
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promises.
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< 0: We cannot handle this address, but if somebody
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else handles (-N) bytes, we can start from there.
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The same routine is used to handle both core and exec files;
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we just tail-call it with more arguments to select between them. */
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int
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xfer_memory (CORE_ADDR memaddr, gdb_byte *myaddr, int len, int write,
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struct mem_attrib *attrib, struct target_ops *target)
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{
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int res;
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struct section_table *p;
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CORE_ADDR nextsectaddr, memend;
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asection *section = NULL;
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if (len <= 0)
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internal_error (__FILE__, __LINE__, _("failed internal consistency check"));
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if (overlay_debugging)
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{
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section = find_pc_overlay (memaddr);
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if (pc_in_unmapped_range (memaddr, section))
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memaddr = overlay_mapped_address (memaddr, section);
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}
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memend = memaddr + len;
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nextsectaddr = memend;
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for (p = target->to_sections; p < target->to_sections_end; p++)
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{
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if (overlay_debugging && section &&
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strcmp (section->name, p->the_bfd_section->name) != 0)
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continue; /* not the section we need */
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if (memaddr >= p->addr)
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{
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if (memend <= p->endaddr)
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{
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/* Entire transfer is within this section. */
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if (write)
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res = bfd_set_section_contents (p->bfd, p->the_bfd_section,
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myaddr, memaddr - p->addr,
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len);
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else
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res = bfd_get_section_contents (p->bfd, p->the_bfd_section,
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myaddr, memaddr - p->addr,
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len);
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return (res != 0) ? len : 0;
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}
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else if (memaddr >= p->endaddr)
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{
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/* This section ends before the transfer starts. */
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continue;
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}
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else
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{
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/* This section overlaps the transfer. Just do half. */
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len = p->endaddr - memaddr;
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if (write)
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res = bfd_set_section_contents (p->bfd, p->the_bfd_section,
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myaddr, memaddr - p->addr,
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len);
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else
|
||
res = bfd_get_section_contents (p->bfd, p->the_bfd_section,
|
||
myaddr, memaddr - p->addr,
|
||
len);
|
||
return (res != 0) ? len : 0;
|
||
}
|
||
}
|
||
else
|
||
nextsectaddr = min (nextsectaddr, p->addr);
|
||
}
|
||
|
||
if (nextsectaddr >= memend)
|
||
return 0; /* We can't help */
|
||
else
|
||
return -(nextsectaddr - memaddr); /* Next boundary where we can help */
|
||
}
|
||
|
||
|
||
void
|
||
print_section_info (struct target_ops *t, bfd *abfd)
|
||
{
|
||
struct section_table *p;
|
||
/* FIXME: 16 is not wide enough when gdbarch_addr_bit > 64. */
|
||
int wid = gdbarch_addr_bit (gdbarch_from_bfd (abfd)) <= 32 ? 8 : 16;
|
||
|
||
printf_filtered ("\t`%s', ", bfd_get_filename (abfd));
|
||
wrap_here (" ");
|
||
printf_filtered (_("file type %s.\n"), bfd_get_target (abfd));
|
||
if (abfd == exec_bfd)
|
||
{
|
||
printf_filtered (_("\tEntry point: "));
|
||
fputs_filtered (paddress (bfd_get_start_address (abfd)), gdb_stdout);
|
||
}
|
||
for (p = t->to_sections; p < t->to_sections_end; p++)
|
||
{
|
||
printf_filtered ("\t%s", hex_string_custom (p->addr, wid));
|
||
printf_filtered (" - %s", hex_string_custom (p->endaddr, wid));
|
||
|
||
/* FIXME: A format of "08l" is not wide enough for file offsets
|
||
larger than 4GB. OTOH, making it "016l" isn't desirable either
|
||
since most output will then be much wider than necessary. It
|
||
may make sense to test the size of the file and choose the
|
||
format string accordingly. */
|
||
/* FIXME: i18n: Need to rewrite this sentence. */
|
||
if (info_verbose)
|
||
printf_filtered (" @ %s",
|
||
hex_string_custom (p->the_bfd_section->filepos, 8));
|
||
printf_filtered (" is %s", bfd_section_name (p->bfd, p->the_bfd_section));
|
||
if (p->bfd != abfd)
|
||
printf_filtered (" in %s", bfd_get_filename (p->bfd));
|
||
printf_filtered ("\n");
|
||
}
|
||
}
|
||
|
||
static void
|
||
exec_files_info (struct target_ops *t)
|
||
{
|
||
print_section_info (t, exec_bfd);
|
||
|
||
if (vmap)
|
||
{
|
||
struct vmap *vp;
|
||
|
||
printf_unfiltered (_("\tMapping info for file `%s'.\n"), vmap->name);
|
||
printf_unfiltered ("\t %*s %*s %*s %*s %8.8s %s\n",
|
||
strlen_paddr (), "tstart",
|
||
strlen_paddr (), "tend",
|
||
strlen_paddr (), "dstart",
|
||
strlen_paddr (), "dend",
|
||
"section",
|
||
"file(member)");
|
||
|
||
for (vp = vmap; vp; vp = vp->nxt)
|
||
printf_unfiltered ("\t0x%s 0x%s 0x%s 0x%s %s%s%s%s\n",
|
||
paddr (vp->tstart),
|
||
paddr (vp->tend),
|
||
paddr (vp->dstart),
|
||
paddr (vp->dend),
|
||
vp->name,
|
||
*vp->member ? "(" : "", vp->member,
|
||
*vp->member ? ")" : "");
|
||
}
|
||
}
|
||
|
||
static void
|
||
set_section_command (char *args, int from_tty)
|
||
{
|
||
struct section_table *p;
|
||
char *secname;
|
||
unsigned seclen;
|
||
unsigned long secaddr;
|
||
char secprint[100];
|
||
long offset;
|
||
|
||
if (args == 0)
|
||
error (_("Must specify section name and its virtual address"));
|
||
|
||
/* Parse out section name */
|
||
for (secname = args; !isspace (*args); args++);
|
||
seclen = args - secname;
|
||
|
||
/* Parse out new virtual address */
|
||
secaddr = parse_and_eval_address (args);
|
||
|
||
for (p = exec_ops.to_sections; p < exec_ops.to_sections_end; p++)
|
||
{
|
||
if (!strncmp (secname, bfd_section_name (exec_bfd, p->the_bfd_section), seclen)
|
||
&& bfd_section_name (exec_bfd, p->the_bfd_section)[seclen] == '\0')
|
||
{
|
||
offset = secaddr - p->addr;
|
||
p->addr += offset;
|
||
p->endaddr += offset;
|
||
if (from_tty)
|
||
exec_files_info (&exec_ops);
|
||
return;
|
||
}
|
||
}
|
||
if (seclen >= sizeof (secprint))
|
||
seclen = sizeof (secprint) - 1;
|
||
strncpy (secprint, secname, seclen);
|
||
secprint[seclen] = '\0';
|
||
error (_("Section %s not found"), secprint);
|
||
}
|
||
|
||
/* If we can find a section in FILENAME with BFD index INDEX, and the
|
||
user has not assigned an address to it yet (via "set section"), adjust it
|
||
to ADDRESS. */
|
||
|
||
void
|
||
exec_set_section_address (const char *filename, int index, CORE_ADDR address)
|
||
{
|
||
struct section_table *p;
|
||
|
||
for (p = exec_ops.to_sections; p < exec_ops.to_sections_end; p++)
|
||
{
|
||
if (strcmp (filename, p->bfd->filename) == 0
|
||
&& index == p->the_bfd_section->index
|
||
&& p->addr == 0)
|
||
{
|
||
p->addr = address;
|
||
p->endaddr += address;
|
||
}
|
||
}
|
||
}
|
||
|
||
/* 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 bp_target_info *bp_tgt)
|
||
{
|
||
return 0;
|
||
}
|
||
|
||
/* Find mapped memory. */
|
||
|
||
extern void
|
||
exec_set_find_memory_regions (int (*func) (int (*) (CORE_ADDR,
|
||
unsigned long,
|
||
int, int, int,
|
||
void *),
|
||
void *))
|
||
{
|
||
exec_ops.to_find_memory_regions = func;
|
||
}
|
||
|
||
static char *exec_make_note_section (bfd *, int *);
|
||
|
||
/* Fill in the exec file target vector. Very few entries need to be
|
||
defined. */
|
||
|
||
static void
|
||
init_exec_ops (void)
|
||
{
|
||
exec_ops.to_shortname = "exec";
|
||
exec_ops.to_longname = "Local exec file";
|
||
exec_ops.to_doc = "Use an executable file as a target.\n\
|
||
Specify the filename of the executable file.";
|
||
exec_ops.to_open = exec_open;
|
||
exec_ops.to_close = exec_close;
|
||
exec_ops.to_attach = find_default_attach;
|
||
exec_ops.deprecated_xfer_memory = xfer_memory;
|
||
exec_ops.to_files_info = exec_files_info;
|
||
exec_ops.to_insert_breakpoint = ignore;
|
||
exec_ops.to_remove_breakpoint = ignore;
|
||
exec_ops.to_create_inferior = find_default_create_inferior;
|
||
exec_ops.to_stratum = file_stratum;
|
||
exec_ops.to_has_memory = 1;
|
||
exec_ops.to_make_corefile_notes = exec_make_note_section;
|
||
exec_ops.to_magic = OPS_MAGIC;
|
||
}
|
||
|
||
void
|
||
_initialize_exec (void)
|
||
{
|
||
struct cmd_list_element *c;
|
||
|
||
init_exec_ops ();
|
||
|
||
if (!dbx_commands)
|
||
{
|
||
c = add_cmd ("file", class_files, file_command, _("\
|
||
Use FILE as program to be debugged.\n\
|
||
It is read for its symbols, for getting the contents of pure memory,\n\
|
||
and it is the program executed when you use the `run' command.\n\
|
||
If FILE cannot be found as specified, your execution directory path\n\
|
||
($PATH) is searched for a command of that name.\n\
|
||
No arg means to have no executable file and no symbols."), &cmdlist);
|
||
set_cmd_completer (c, filename_completer);
|
||
}
|
||
|
||
c = add_cmd ("exec-file", class_files, exec_file_command, _("\
|
||
Use FILE as program for getting contents of pure memory.\n\
|
||
If FILE cannot be found as specified, your execution directory path\n\
|
||
is searched for a command of that name.\n\
|
||
No arg means have no executable file."), &cmdlist);
|
||
set_cmd_completer (c, filename_completer);
|
||
|
||
add_com ("section", class_files, set_section_command, _("\
|
||
Change the base address of section SECTION of the exec file to ADDR.\n\
|
||
This can be used if the exec file does not contain section addresses,\n\
|
||
(such as in the a.out format), or when the addresses specified in the\n\
|
||
file itself are wrong. Each section must be changed separately. The\n\
|
||
``info files'' command lists all the sections and their addresses."));
|
||
|
||
add_setshow_boolean_cmd ("write", class_support, &write_files, _("\
|
||
Set writing into executable and core files."), _("\
|
||
Show writing into executable and core files."), NULL,
|
||
NULL,
|
||
show_write_files,
|
||
&setlist, &showlist);
|
||
|
||
add_target (&exec_ops);
|
||
}
|
||
|
||
static char *
|
||
exec_make_note_section (bfd *obfd, int *note_size)
|
||
{
|
||
error (_("Can't create a corefile"));
|
||
}
|