bf74e428bc
This commit fixes an error in exec_file_locate_attach where the main executable could be loaded from outside the sysroot if a nonempty, non-"target:" sysroot was set but the discovered executable filename did not exist in that sysroot and did exist on the main filesystem. gdb/ChangeLog: * exec.c (exec_file_locate_attach): Do not attempt to locate main executable locally if not found in sysroot. gdb/testsuite/ChangeLog: * gdb.base/attach-pie-noexec.exp: Do not expect an error message on attach.
1097 lines
29 KiB
C
1097 lines
29 KiB
C
/* Work with executable files, for GDB.
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Copyright (C) 1988-2016 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 "filenames.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 "gdbthread.h"
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#include "progspace.h"
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#include "gdb_bfd.h"
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#include "gcore.h"
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#include <fcntl.h>
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#include "readline/readline.h"
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#include "gdbcore.h"
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#include <ctype.h>
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#include <sys/stat.h>
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#include "solist.h"
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void (*deprecated_file_changed_hook) (char *);
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/* Prototypes for local functions */
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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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static struct target_ops exec_ops;
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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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static void
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exec_open (const 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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/* Close and clear exec_bfd. If we end up with no target sections to
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read memory from, this unpushes the exec_ops target. */
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void
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exec_close (void)
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{
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if (exec_bfd)
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{
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bfd *abfd = exec_bfd;
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gdb_bfd_unref (abfd);
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/* Removing target sections may close the exec_ops target.
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Clear exec_bfd before doing so to prevent recursion. */
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exec_bfd = NULL;
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exec_bfd_mtime = 0;
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remove_target_sections (&exec_bfd);
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xfree (exec_filename);
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exec_filename = NULL;
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}
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}
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/* This is the target_close implementation. Clears all target
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sections and closes all executable bfds from all program spaces. */
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static void
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exec_close_1 (struct target_ops *self)
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{
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struct program_space *ss;
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struct cleanup *old_chain;
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old_chain = save_current_program_space ();
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ALL_PSPACES (ss)
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{
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set_current_program_space (ss);
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clear_section_table (current_target_sections);
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exec_close ();
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}
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do_cleanups (old_chain);
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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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exec_close ();
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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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/* See gdbcore.h. */
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void
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exec_file_locate_attach (int pid, int from_tty)
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{
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char *exec_file, *full_exec_path = NULL;
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struct cleanup *old_chain;
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/* Do nothing if we already have an executable filename. */
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exec_file = (char *) get_exec_file (0);
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if (exec_file != NULL)
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return;
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/* Try to determine a filename from the process itself. */
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exec_file = target_pid_to_exec_file (pid);
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if (exec_file == NULL)
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return;
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/* If gdb_sysroot is not empty and the discovered filename
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is absolute then prefix the filename with gdb_sysroot. */
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if (*gdb_sysroot != '\0' && IS_ABSOLUTE_PATH (exec_file))
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{
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full_exec_path = exec_file_find (exec_file, NULL);
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if (full_exec_path == NULL)
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return;
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}
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else
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{
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/* It's possible we don't have a full path, but rather just a
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filename. Some targets, such as HP-UX, don't provide the
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full path, sigh.
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Attempt to qualify the filename against the source path.
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(If that fails, we'll just fall back on the original
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filename. Not much more we can do...) */
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if (!source_full_path_of (exec_file, &full_exec_path))
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full_exec_path = xstrdup (exec_file);
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}
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old_chain = make_cleanup (xfree, full_exec_path);
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exec_file_attach (full_exec_path, from_tty);
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symbol_file_add_main (full_exec_path, from_tty);
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do_cleanups (old_chain);
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}
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/* Set FILENAME 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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void
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exec_file_attach (const char *filename, int from_tty)
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{
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struct cleanup *cleanups;
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/* First, acquire a reference to the current exec_bfd. We release
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this at the end of the function; but acquiring it now lets the
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BFD cache return it if this call refers to the same file. */
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gdb_bfd_ref (exec_bfd);
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cleanups = make_cleanup_bfd_unref (exec_bfd);
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/* Remove any previous exec file. */
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exec_close ();
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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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int load_via_target = 0;
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char *scratch_pathname, *canonical_pathname;
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int scratch_chan;
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struct target_section *sections = NULL, *sections_end = NULL;
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char **matching;
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if (is_target_filename (filename))
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{
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if (target_filesystem_is_local ())
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filename += strlen (TARGET_SYSROOT_PREFIX);
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else
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load_via_target = 1;
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}
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if (load_via_target)
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{
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/* gdb_bfd_fopen does not support "target:" filenames. */
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if (write_files)
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warning (_("writing into executable files is "
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"not supported for %s sysroots"),
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TARGET_SYSROOT_PREFIX);
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scratch_pathname = xstrdup (filename);
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make_cleanup (xfree, scratch_pathname);
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scratch_chan = -1;
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canonical_pathname = scratch_pathname;
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}
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else
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{
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scratch_chan = openp (getenv ("PATH"), OPF_TRY_CWD_FIRST,
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filename, write_files ?
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O_RDWR | O_BINARY : O_RDONLY | O_BINARY,
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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 = (char *) 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,
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exename, write_files ?
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O_RDWR | O_BINARY
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: O_RDONLY | O_BINARY,
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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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make_cleanup (xfree, scratch_pathname);
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/* gdb_bfd_open (and its variants) prefers canonicalized
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pathname for better BFD caching. */
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canonical_pathname = gdb_realpath (scratch_pathname);
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make_cleanup (xfree, canonical_pathname);
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}
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if (write_files && !load_via_target)
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exec_bfd = gdb_bfd_fopen (canonical_pathname, gnutarget,
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FOPEN_RUB, scratch_chan);
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else
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exec_bfd = gdb_bfd_open (canonical_pathname, gnutarget, scratch_chan);
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if (!exec_bfd)
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{
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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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}
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/* gdb_realpath_keepfile resolves symlinks on the local
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filesystem and so cannot be used for "target:" files. */
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gdb_assert (exec_filename == NULL);
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if (load_via_target)
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exec_filename = xstrdup (bfd_get_filename (exec_bfd));
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else
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exec_filename = gdb_realpath_keepfile (scratch_pathname);
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if (!bfd_check_format_matches (exec_bfd, bfd_object, &matching))
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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 ();
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error (_("\"%s\": not in executable format: %s"),
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scratch_pathname,
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gdb_bfd_errmsg (bfd_get_error (), matching));
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}
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if (build_section_table (exec_bfd, §ions, §ions_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 ();
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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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/* Add the executable's sections to the current address spaces'
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list of sections. This possibly pushes the exec_ops
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target. */
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add_target_sections (&exec_bfd, sections, sections_end);
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xfree (sections);
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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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do_cleanups (cleanups);
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bfd_cache_close_all ();
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observer_notify_executable_changed ();
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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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struct cleanup *cleanups;
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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 = gdb_buildargv (args);
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cleanups = 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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do_cleanups (cleanups);
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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 target_section **table_pp = (struct target_section **) table_pp_char;
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flagword aflag;
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gdb_assert (abfd == asect->owner);
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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)->owner = NULL;
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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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/* See exec.h. */
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void
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clear_section_table (struct target_section_table *table)
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{
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xfree (table->sections);
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table->sections = table->sections_end = NULL;
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}
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/* Resize section table TABLE by ADJUSTMENT.
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ADJUSTMENT may be negative, in which case the caller must have already
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removed the sections being deleted.
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Returns the old size. */
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static int
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resize_section_table (struct target_section_table *table, int adjustment)
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{
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int old_count;
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int new_count;
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old_count = table->sections_end - table->sections;
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new_count = adjustment + old_count;
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if (new_count)
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{
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table->sections = XRESIZEVEC (struct target_section, table->sections,
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new_count);
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table->sections_end = table->sections + new_count;
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}
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else
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clear_section_table (table);
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return old_count;
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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 target_section **start,
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struct target_section **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 = XNEWVEC (struct target_section, count);
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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__,
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_("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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/* Add the sections array defined by [SECTIONS..SECTIONS_END[ to the
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current set of target sections. */
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void
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add_target_sections (void *owner,
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struct target_section *sections,
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struct target_section *sections_end)
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{
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int count;
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struct target_section_table *table = current_target_sections;
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count = sections_end - sections;
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if (count > 0)
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{
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int space = resize_section_table (table, count);
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int i;
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for (i = 0; i < count; ++i)
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{
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table->sections[space + i] = sections[i];
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table->sections[space + i].owner = owner;
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}
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|
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/* If these are the first file sections we can provide memory
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from, push the file_stratum target. */
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if (!target_is_pushed (&exec_ops))
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push_target (&exec_ops);
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}
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}
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|
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/* Add the sections of OBJFILE to the current set of target sections. */
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||
|
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void
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add_target_sections_of_objfile (struct objfile *objfile)
|
||
{
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||
struct target_section_table *table = current_target_sections;
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struct obj_section *osect;
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||
int space;
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unsigned count = 0;
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struct target_section *ts;
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|
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if (objfile == NULL)
|
||
return;
|
||
|
||
/* Compute the number of sections to add. */
|
||
ALL_OBJFILE_OSECTIONS (objfile, osect)
|
||
{
|
||
if (bfd_get_section_size (osect->the_bfd_section) == 0)
|
||
continue;
|
||
count++;
|
||
}
|
||
|
||
if (count == 0)
|
||
return;
|
||
|
||
space = resize_section_table (table, count);
|
||
|
||
ts = table->sections + space;
|
||
|
||
ALL_OBJFILE_OSECTIONS (objfile, osect)
|
||
{
|
||
if (bfd_get_section_size (osect->the_bfd_section) == 0)
|
||
continue;
|
||
|
||
gdb_assert (ts < table->sections + space + count);
|
||
|
||
ts->addr = obj_section_addr (osect);
|
||
ts->endaddr = obj_section_endaddr (osect);
|
||
ts->the_bfd_section = osect->the_bfd_section;
|
||
ts->owner = (void *) objfile;
|
||
|
||
ts++;
|
||
}
|
||
}
|
||
|
||
/* Remove all target sections owned by OWNER.
|
||
OWNER must be the same value passed to add_target_sections. */
|
||
|
||
void
|
||
remove_target_sections (void *owner)
|
||
{
|
||
struct target_section *src, *dest;
|
||
struct target_section_table *table = current_target_sections;
|
||
|
||
gdb_assert (owner != NULL);
|
||
|
||
dest = table->sections;
|
||
for (src = table->sections; src < table->sections_end; src++)
|
||
if (src->owner != owner)
|
||
{
|
||
/* Keep this section. */
|
||
if (dest < src)
|
||
*dest = *src;
|
||
dest++;
|
||
}
|
||
|
||
/* If we've dropped any sections, resize the section table. */
|
||
if (dest < src)
|
||
{
|
||
int old_count;
|
||
|
||
old_count = resize_section_table (table, dest - src);
|
||
|
||
/* If we don't have any more sections to read memory from,
|
||
remove the file_stratum target from the stack. */
|
||
if (old_count + (dest - src) == 0)
|
||
{
|
||
struct program_space *pspace;
|
||
|
||
ALL_PSPACES (pspace)
|
||
if (pspace->target_sections.sections
|
||
!= pspace->target_sections.sections_end)
|
||
return;
|
||
|
||
unpush_target (&exec_ops);
|
||
}
|
||
}
|
||
}
|
||
|
||
|
||
|
||
enum target_xfer_status
|
||
exec_read_partial_read_only (gdb_byte *readbuf, ULONGEST offset,
|
||
ULONGEST len, ULONGEST *xfered_len)
|
||
{
|
||
/* It's unduly pedantic to refuse to look at the executable for
|
||
read-only pieces; so do the equivalent of readonly regions aka
|
||
QTro packet. */
|
||
if (exec_bfd != NULL)
|
||
{
|
||
asection *s;
|
||
bfd_size_type size;
|
||
bfd_vma vma;
|
||
|
||
for (s = exec_bfd->sections; s; s = s->next)
|
||
{
|
||
if ((s->flags & SEC_LOAD) == 0
|
||
|| (s->flags & SEC_READONLY) == 0)
|
||
continue;
|
||
|
||
vma = s->vma;
|
||
size = bfd_get_section_size (s);
|
||
if (vma <= offset && offset < (vma + size))
|
||
{
|
||
ULONGEST amt;
|
||
|
||
amt = (vma + size) - offset;
|
||
if (amt > len)
|
||
amt = len;
|
||
|
||
amt = bfd_get_section_contents (exec_bfd, s,
|
||
readbuf, offset - vma, amt);
|
||
|
||
if (amt == 0)
|
||
return TARGET_XFER_EOF;
|
||
else
|
||
{
|
||
*xfered_len = amt;
|
||
return TARGET_XFER_OK;
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
/* Indicate failure to find the requested memory block. */
|
||
return TARGET_XFER_E_IO;
|
||
}
|
||
|
||
/* Appends all read-only memory ranges found in the target section
|
||
table defined by SECTIONS and SECTIONS_END, starting at (and
|
||
intersected with) MEMADDR for LEN bytes. Returns the augmented
|
||
VEC. */
|
||
|
||
static VEC(mem_range_s) *
|
||
section_table_available_memory (VEC(mem_range_s) *memory,
|
||
CORE_ADDR memaddr, ULONGEST len,
|
||
struct target_section *sections,
|
||
struct target_section *sections_end)
|
||
{
|
||
struct target_section *p;
|
||
|
||
for (p = sections; p < sections_end; p++)
|
||
{
|
||
if ((bfd_get_section_flags (p->the_bfd_section->owner,
|
||
p->the_bfd_section)
|
||
& SEC_READONLY) == 0)
|
||
continue;
|
||
|
||
/* Copy the meta-data, adjusted. */
|
||
if (mem_ranges_overlap (p->addr, p->endaddr - p->addr, memaddr, len))
|
||
{
|
||
ULONGEST lo1, hi1, lo2, hi2;
|
||
struct mem_range *r;
|
||
|
||
lo1 = memaddr;
|
||
hi1 = memaddr + len;
|
||
|
||
lo2 = p->addr;
|
||
hi2 = p->endaddr;
|
||
|
||
r = VEC_safe_push (mem_range_s, memory, NULL);
|
||
|
||
r->start = max (lo1, lo2);
|
||
r->length = min (hi1, hi2) - r->start;
|
||
}
|
||
}
|
||
|
||
return memory;
|
||
}
|
||
|
||
enum target_xfer_status
|
||
section_table_read_available_memory (gdb_byte *readbuf, ULONGEST offset,
|
||
ULONGEST len, ULONGEST *xfered_len)
|
||
{
|
||
VEC(mem_range_s) *available_memory = NULL;
|
||
struct target_section_table *table;
|
||
struct cleanup *old_chain;
|
||
mem_range_s *r;
|
||
int i;
|
||
|
||
table = target_get_section_table (&exec_ops);
|
||
available_memory = section_table_available_memory (available_memory,
|
||
offset, len,
|
||
table->sections,
|
||
table->sections_end);
|
||
|
||
old_chain = make_cleanup (VEC_cleanup(mem_range_s),
|
||
&available_memory);
|
||
|
||
normalize_mem_ranges (available_memory);
|
||
|
||
for (i = 0;
|
||
VEC_iterate (mem_range_s, available_memory, i, r);
|
||
i++)
|
||
{
|
||
if (mem_ranges_overlap (r->start, r->length, offset, len))
|
||
{
|
||
CORE_ADDR end;
|
||
enum target_xfer_status status;
|
||
|
||
/* Get the intersection window. */
|
||
end = min (offset + len, r->start + r->length);
|
||
|
||
gdb_assert (end - offset <= len);
|
||
|
||
if (offset >= r->start)
|
||
status = exec_read_partial_read_only (readbuf, offset,
|
||
end - offset,
|
||
xfered_len);
|
||
else
|
||
{
|
||
*xfered_len = r->start - offset;
|
||
status = TARGET_XFER_UNAVAILABLE;
|
||
}
|
||
do_cleanups (old_chain);
|
||
return status;
|
||
}
|
||
}
|
||
do_cleanups (old_chain);
|
||
|
||
*xfered_len = len;
|
||
return TARGET_XFER_UNAVAILABLE;
|
||
}
|
||
|
||
enum target_xfer_status
|
||
section_table_xfer_memory_partial (gdb_byte *readbuf, const gdb_byte *writebuf,
|
||
ULONGEST offset, ULONGEST len,
|
||
ULONGEST *xfered_len,
|
||
struct target_section *sections,
|
||
struct target_section *sections_end,
|
||
const char *section_name)
|
||
{
|
||
int res;
|
||
struct target_section *p;
|
||
ULONGEST memaddr = offset;
|
||
ULONGEST memend = memaddr + len;
|
||
|
||
if (len == 0)
|
||
internal_error (__FILE__, __LINE__,
|
||
_("failed internal consistency check"));
|
||
|
||
for (p = sections; p < sections_end; p++)
|
||
{
|
||
struct bfd_section *asect = p->the_bfd_section;
|
||
bfd *abfd = asect->owner;
|
||
|
||
if (section_name && strcmp (section_name, asect->name) != 0)
|
||
continue; /* not the section we need. */
|
||
if (memaddr >= p->addr)
|
||
{
|
||
if (memend <= p->endaddr)
|
||
{
|
||
/* Entire transfer is within this section. */
|
||
if (writebuf)
|
||
res = bfd_set_section_contents (abfd, asect,
|
||
writebuf, memaddr - p->addr,
|
||
len);
|
||
else
|
||
res = bfd_get_section_contents (abfd, asect,
|
||
readbuf, memaddr - p->addr,
|
||
len);
|
||
|
||
if (res != 0)
|
||
{
|
||
*xfered_len = len;
|
||
return TARGET_XFER_OK;
|
||
}
|
||
else
|
||
return TARGET_XFER_EOF;
|
||
}
|
||
else if (memaddr >= p->endaddr)
|
||
{
|
||
/* This section ends before the transfer starts. */
|
||
continue;
|
||
}
|
||
else
|
||
{
|
||
/* This section overlaps the transfer. Just do half. */
|
||
len = p->endaddr - memaddr;
|
||
if (writebuf)
|
||
res = bfd_set_section_contents (abfd, asect,
|
||
writebuf, memaddr - p->addr,
|
||
len);
|
||
else
|
||
res = bfd_get_section_contents (abfd, asect,
|
||
readbuf, memaddr - p->addr,
|
||
len);
|
||
if (res != 0)
|
||
{
|
||
*xfered_len = len;
|
||
return TARGET_XFER_OK;
|
||
}
|
||
else
|
||
return TARGET_XFER_EOF;
|
||
}
|
||
}
|
||
}
|
||
|
||
return TARGET_XFER_EOF; /* We can't help. */
|
||
}
|
||
|
||
static struct target_section_table *
|
||
exec_get_section_table (struct target_ops *ops)
|
||
{
|
||
return current_target_sections;
|
||
}
|
||
|
||
static enum target_xfer_status
|
||
exec_xfer_partial (struct target_ops *ops, enum target_object object,
|
||
const char *annex, gdb_byte *readbuf,
|
||
const gdb_byte *writebuf,
|
||
ULONGEST offset, ULONGEST len, ULONGEST *xfered_len)
|
||
{
|
||
struct target_section_table *table = target_get_section_table (ops);
|
||
|
||
if (object == TARGET_OBJECT_MEMORY)
|
||
return section_table_xfer_memory_partial (readbuf, writebuf,
|
||
offset, len, xfered_len,
|
||
table->sections,
|
||
table->sections_end,
|
||
NULL);
|
||
else
|
||
return TARGET_XFER_E_IO;
|
||
}
|
||
|
||
|
||
void
|
||
print_section_info (struct target_section_table *t, bfd *abfd)
|
||
{
|
||
struct gdbarch *gdbarch = gdbarch_from_bfd (abfd);
|
||
struct target_section *p;
|
||
/* FIXME: 16 is not wide enough when gdbarch_addr_bit > 64. */
|
||
int wid = gdbarch_addr_bit (gdbarch) <= 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)
|
||
{
|
||
/* gcc-3.4 does not like the initialization in
|
||
<p == t->sections_end>. */
|
||
bfd_vma displacement = 0;
|
||
bfd_vma entry_point;
|
||
|
||
for (p = t->sections; p < t->sections_end; p++)
|
||
{
|
||
struct bfd_section *psect = p->the_bfd_section;
|
||
bfd *pbfd = psect->owner;
|
||
|
||
if ((bfd_get_section_flags (pbfd, psect) & (SEC_ALLOC | SEC_LOAD))
|
||
!= (SEC_ALLOC | SEC_LOAD))
|
||
continue;
|
||
|
||
if (bfd_get_section_vma (pbfd, psect) <= abfd->start_address
|
||
&& abfd->start_address < (bfd_get_section_vma (pbfd, psect)
|
||
+ bfd_get_section_size (psect)))
|
||
{
|
||
displacement = p->addr - bfd_get_section_vma (pbfd, psect);
|
||
break;
|
||
}
|
||
}
|
||
if (p == t->sections_end)
|
||
warning (_("Cannot find section for the entry point of %s."),
|
||
bfd_get_filename (abfd));
|
||
|
||
entry_point = gdbarch_addr_bits_remove (gdbarch,
|
||
bfd_get_start_address (abfd)
|
||
+ displacement);
|
||
printf_filtered (_("\tEntry point: %s\n"),
|
||
paddress (gdbarch, entry_point));
|
||
}
|
||
for (p = t->sections; p < t->sections_end; p++)
|
||
{
|
||
struct bfd_section *psect = p->the_bfd_section;
|
||
bfd *pbfd = psect->owner;
|
||
|
||
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 (psect->filepos, 8));
|
||
printf_filtered (" is %s", bfd_section_name (pbfd, psect));
|
||
if (pbfd != abfd)
|
||
printf_filtered (" in %s", bfd_get_filename (pbfd));
|
||
printf_filtered ("\n");
|
||
}
|
||
}
|
||
|
||
static void
|
||
exec_files_info (struct target_ops *t)
|
||
{
|
||
if (exec_bfd)
|
||
print_section_info (current_target_sections, exec_bfd);
|
||
else
|
||
puts_filtered (_("\t<no file loaded>\n"));
|
||
}
|
||
|
||
static void
|
||
set_section_command (char *args, int from_tty)
|
||
{
|
||
struct target_section *p;
|
||
char *secname;
|
||
unsigned seclen;
|
||
unsigned long secaddr;
|
||
char secprint[100];
|
||
long offset;
|
||
struct target_section_table *table;
|
||
|
||
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);
|
||
|
||
table = current_target_sections;
|
||
for (p = table->sections; p < table->sections_end; p++)
|
||
{
|
||
if (!strncmp (secname, bfd_section_name (p->bfd,
|
||
p->the_bfd_section), seclen)
|
||
&& bfd_section_name (p->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, adjust
|
||
it to ADDRESS. */
|
||
|
||
void
|
||
exec_set_section_address (const char *filename, int index, CORE_ADDR address)
|
||
{
|
||
struct target_section *p;
|
||
struct target_section_table *table;
|
||
|
||
table = current_target_sections;
|
||
for (p = table->sections; p < table->sections_end; p++)
|
||
{
|
||
if (filename_cmp (filename, p->the_bfd_section->owner->filename) == 0
|
||
&& index == p->the_bfd_section->index)
|
||
{
|
||
p->endaddr += address - p->addr;
|
||
p->addr = 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 target_ops *ops, struct gdbarch *gdbarch,
|
||
struct bp_target_info *bp_tgt)
|
||
{
|
||
return 0;
|
||
}
|
||
|
||
static int
|
||
exec_has_memory (struct target_ops *ops)
|
||
{
|
||
/* We can provide memory if we have any file/target sections to read
|
||
from. */
|
||
return (current_target_sections->sections
|
||
!= current_target_sections->sections_end);
|
||
}
|
||
|
||
static char *
|
||
exec_make_note_section (struct target_ops *self, bfd *obfd, int *note_size)
|
||
{
|
||
error (_("Can't create a corefile"));
|
||
}
|
||
|
||
/* 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_1;
|
||
exec_ops.to_xfer_partial = exec_xfer_partial;
|
||
exec_ops.to_get_section_table = exec_get_section_table;
|
||
exec_ops.to_files_info = exec_files_info;
|
||
exec_ops.to_insert_breakpoint = ignore;
|
||
exec_ops.to_remove_breakpoint = ignore;
|
||
exec_ops.to_stratum = file_stratum;
|
||
exec_ops.to_has_memory = exec_has_memory;
|
||
exec_ops.to_make_corefile_notes = exec_make_note_section;
|
||
exec_ops.to_find_memory_regions = objfile_find_memory_regions;
|
||
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_with_completer (&exec_ops, filename_completer);
|
||
}
|