1230 lines
34 KiB
C
1230 lines
34 KiB
C
/* Work with executable files, for GDB.
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Copyright (C) 1988-2020 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 "observable.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 "progspace-and-thread.h"
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#include "gdb_bfd.h"
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#include "gcore.h"
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#include "source.h"
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#include <fcntl.h>
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#include "readline/tilde.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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#include <algorithm>
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#include "gdbsupport/pathstuff.h"
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#include "cli/cli-style.h"
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void (*deprecated_file_changed_hook) (const char *);
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static const target_info exec_target_info = {
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"exec",
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N_("Local exec file"),
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N_("Use an executable file as a target.\n\
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Specify the filename of the executable file.")
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};
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/* The target vector for executable files. */
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struct exec_target final : public target_ops
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{
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const target_info &info () const override
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{ return exec_target_info; }
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strata stratum () const override { return file_stratum; }
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void close () override;
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enum target_xfer_status xfer_partial (enum target_object object,
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const char *annex,
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gdb_byte *readbuf,
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const gdb_byte *writebuf,
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ULONGEST offset, ULONGEST len,
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ULONGEST *xfered_len) override;
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struct target_section_table *get_section_table () override;
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void files_info () override;
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bool has_memory () override;
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char *make_corefile_notes (bfd *, int *) override;
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int find_memory_regions (find_memory_region_ftype func, void *data) override;
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};
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static exec_target exec_ops;
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/* How to handle a mismatch between the current exec file and the exec
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file determined from target. */
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static const char *const exec_file_mismatch_names[]
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= {"ask", "warn", "off", NULL };
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enum exec_file_mismatch_mode
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{
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exec_file_mismatch_ask, exec_file_mismatch_warn, exec_file_mismatch_off
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};
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static const char *exec_file_mismatch = exec_file_mismatch_names[0];
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static enum exec_file_mismatch_mode exec_file_mismatch_mode
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= exec_file_mismatch_ask;
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/* Show command. */
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static void
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show_exec_file_mismatch_command (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 (gdb_stdout,
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_("exec-file-mismatch handling is currently \"%s\".\n"),
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exec_file_mismatch_names[exec_file_mismatch_mode]);
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}
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/* Set command. Change the setting for range checking. */
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static void
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set_exec_file_mismatch_command (const char *ignore,
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int from_tty, struct cmd_list_element *c)
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{
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for (enum exec_file_mismatch_mode mode = exec_file_mismatch_ask;
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;
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mode = static_cast<enum exec_file_mismatch_mode>(1 + (int) mode))
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{
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if (strcmp (exec_file_mismatch, exec_file_mismatch_names[mode]) == 0)
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{
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exec_file_mismatch_mode = mode;
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return;
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}
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if (mode == exec_file_mismatch_off)
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internal_error (__FILE__, __LINE__,
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_("Unrecognized exec-file-mismatch setting: \"%s\""),
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exec_file_mismatch);
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}
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}
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/* Whether to open exec and core files read-only or read-write. */
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bool write_files = false;
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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_target_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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void
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exec_target::close ()
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{
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scoped_restore_current_program_space restore_pspace;
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for (struct program_space *ss : program_spaces)
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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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}
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/* See gdbcore.h. */
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void
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try_open_exec_file (const char *exec_file_host, struct inferior *inf,
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symfile_add_flags add_flags)
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{
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struct gdb_exception prev_err;
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/* exec_file_attach and symbol_file_add_main may throw an error if the file
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cannot be opened either locally or remotely.
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This happens for example, when the file is first found in the local
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sysroot (above), and then disappears (a TOCTOU race), or when it doesn't
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exist in the target filesystem, or when the file does exist, but
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is not readable.
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Even without a symbol file, the remote-based debugging session should
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continue normally instead of ending abruptly. Hence we catch thrown
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errors/exceptions in the following code. */
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try
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{
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/* We must do this step even if exec_file_host is NULL, so that
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exec_file_attach will clear state. */
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exec_file_attach (exec_file_host, add_flags & SYMFILE_VERBOSE);
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}
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catch (gdb_exception_error &err)
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{
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if (err.message != NULL)
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warning ("%s", err.what ());
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prev_err = std::move (err);
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}
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if (exec_file_host != NULL)
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{
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try
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{
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symbol_file_add_main (exec_file_host, add_flags);
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}
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catch (const gdb_exception_error &err)
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{
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if (!exception_print_same (prev_err, err))
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warning ("%s", err.what ());
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}
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}
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}
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/* See gdbcore.h. */
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void
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validate_exec_file (int from_tty)
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{
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/* If user asked to ignore the mismatch, do nothing. */
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if (exec_file_mismatch_mode == exec_file_mismatch_off)
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return;
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const char *current_exec_file = get_exec_file (0);
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struct inferior *inf = current_inferior ();
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/* Try to determine a filename from the process itself. */
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const char *pid_exec_file = target_pid_to_exec_file (inf->pid);
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/* If wee cannot validate the exec file, return. */
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if (current_exec_file == NULL || pid_exec_file == NULL)
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return;
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std::string exec_file_target (pid_exec_file);
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/* In case the exec file is not local, exec_file_target has to point at
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the target file system. */
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if (is_target_filename (current_exec_file) && !target_filesystem_is_local ())
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exec_file_target = TARGET_SYSROOT_PREFIX + exec_file_target;
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if (exec_file_target != current_exec_file)
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{
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warning
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(_("Mismatch between current exec-file %ps\n"
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"and automatically determined exec-file %ps\n"
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"exec-file-mismatch handling is currently \"%s\""),
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styled_string (file_name_style.style (), current_exec_file),
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styled_string (file_name_style.style (), exec_file_target.c_str ()),
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exec_file_mismatch_names[exec_file_mismatch_mode]);
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if (exec_file_mismatch_mode == exec_file_mismatch_ask)
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{
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symfile_add_flags add_flags = SYMFILE_MAINLINE;
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if (from_tty)
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add_flags |= SYMFILE_VERBOSE;
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try
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{
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symbol_file_add_main (exec_file_target.c_str (), add_flags);
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exec_file_attach (exec_file_target.c_str (), from_tty);
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}
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catch (gdb_exception_error &err)
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{
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warning (_("loading %ps %s"),
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styled_string (file_name_style.style (),
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exec_file_target.c_str ()),
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err.message != NULL ? err.what () : "error");
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}
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}
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}
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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 defer_bp_reset, int from_tty)
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{
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char *exec_file_target;
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symfile_add_flags add_flags = 0;
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/* Do nothing if we already have an executable filename. */
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if (get_exec_file (0) != 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 = target_pid_to_exec_file (pid);
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if (exec_file_target == NULL)
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{
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warning (_("No executable has been specified and target does not "
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"support\n"
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"determining executable automatically. "
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"Try using the \"file\" command."));
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return;
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}
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gdb::unique_xmalloc_ptr<char> exec_file_host
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= exec_file_find (exec_file_target, NULL);
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if (defer_bp_reset)
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add_flags |= SYMFILE_DEFER_BP_RESET;
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if (from_tty)
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add_flags |= SYMFILE_VERBOSE;
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/* Attempt to open the exec file. */
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try_open_exec_file (exec_file_host.get (), current_inferior (), add_flags);
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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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/* 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_ptr exec_bfd_holder = gdb_bfd_ref_ptr::new_reference (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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const 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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gdb::unique_xmalloc_ptr<char> canonical_storage, scratch_storage;
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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 = filename;
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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_storage);
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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_storage);
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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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scratch_pathname = scratch_storage.get ();
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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_storage = gdb_realpath (scratch_pathname);
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canonical_pathname = canonical_storage.get ();
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}
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gdb_bfd_ref_ptr temp;
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if (write_files && !load_via_target)
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temp = gdb_bfd_fopen (canonical_pathname, gnutarget,
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FOPEN_RUB, scratch_chan);
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else
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temp = gdb_bfd_open (canonical_pathname, gnutarget, scratch_chan);
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exec_bfd = temp.release ();
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if (!exec_bfd)
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{
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error (_("\"%ps\": could not open as an executable file: %s."),
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styled_string (file_name_style.style (), scratch_pathname),
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bfd_errmsg (bfd_get_error ()));
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}
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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));
|
||
else
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||
exec_filename = gdb_realpath_keepfile (scratch_pathname).release ();
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||
|
||
if (!bfd_check_format_matches (exec_bfd, bfd_object, &matching))
|
||
{
|
||
/* Make sure to close exec_bfd, or else "run" might try to use
|
||
it. */
|
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exec_close ();
|
||
error (_("\"%ps\": not in executable format: %s"),
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styled_string (file_name_style.style (), scratch_pathname),
|
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gdb_bfd_errmsg (bfd_get_error (), matching).c_str ());
|
||
}
|
||
|
||
if (build_section_table (exec_bfd, §ions, §ions_end))
|
||
{
|
||
/* Make sure to close exec_bfd, or else "run" might try to use
|
||
it. */
|
||
exec_close ();
|
||
error (_("\"%ps\": can't find the file sections: %s"),
|
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styled_string (file_name_style.style (), scratch_pathname),
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||
bfd_errmsg (bfd_get_error ()));
|
||
}
|
||
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||
exec_bfd_mtime = bfd_get_mtime (exec_bfd);
|
||
|
||
validate_files ();
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||
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||
set_gdbarch_from_file (exec_bfd);
|
||
|
||
/* Add the executable's sections to the current address spaces'
|
||
list of sections. This possibly pushes the exec_ops
|
||
target. */
|
||
add_target_sections (&exec_bfd, sections, sections_end);
|
||
xfree (sections);
|
||
|
||
/* Tell display code (if any) about the changed file name. */
|
||
if (deprecated_exec_file_display_hook)
|
||
(*deprecated_exec_file_display_hook) (filename);
|
||
}
|
||
|
||
bfd_cache_close_all ();
|
||
gdb::observers::executable_changed.notify ();
|
||
}
|
||
|
||
/* Process the first arg in ARGS as the new exec file.
|
||
|
||
Note that we have to explicitly ignore additional args, since we can
|
||
be called from file_command(), which also calls symbol_file_command()
|
||
which can take multiple args.
|
||
|
||
If ARGS is NULL, we just want to close the exec file. */
|
||
|
||
static void
|
||
exec_file_command (const char *args, int from_tty)
|
||
{
|
||
if (from_tty && target_has_execution
|
||
&& !query (_("A program is being debugged already.\n"
|
||
"Are you sure you want to change the file? ")))
|
||
error (_("File not changed."));
|
||
|
||
if (args)
|
||
{
|
||
/* Scan through the args and pick up the first non option arg
|
||
as the filename. */
|
||
|
||
gdb_argv built_argv (args);
|
||
char **argv = built_argv.get ();
|
||
|
||
for (; (*argv != NULL) && (**argv == '-'); argv++)
|
||
{;
|
||
}
|
||
if (*argv == NULL)
|
||
error (_("No executable file name was specified"));
|
||
|
||
gdb::unique_xmalloc_ptr<char> filename (tilde_expand (*argv));
|
||
exec_file_attach (filename.get (), from_tty);
|
||
}
|
||
else
|
||
exec_file_attach (NULL, from_tty);
|
||
}
|
||
|
||
/* Set both the exec file and the symbol file, in one command.
|
||
What a novelty. Why did GDB go through four major releases before this
|
||
command was added? */
|
||
|
||
static void
|
||
file_command (const char *arg, int from_tty)
|
||
{
|
||
/* FIXME, if we lose on reading the symbol file, we should revert
|
||
the exec file, but that's rough. */
|
||
exec_file_command (arg, from_tty);
|
||
symbol_file_command (arg, from_tty);
|
||
if (deprecated_file_changed_hook)
|
||
deprecated_file_changed_hook (arg);
|
||
}
|
||
|
||
|
||
/* Locate all mappable sections of a BFD file.
|
||
table_pp_char is a char * to get it through bfd_map_over_sections;
|
||
we cast it back to its proper type. */
|
||
|
||
static void
|
||
add_to_section_table (bfd *abfd, struct bfd_section *asect,
|
||
void *table_pp_char)
|
||
{
|
||
struct target_section **table_pp = (struct target_section **) table_pp_char;
|
||
flagword aflag;
|
||
|
||
gdb_assert (abfd == asect->owner);
|
||
|
||
/* Check the section flags, but do not discard zero-length sections, since
|
||
some symbols may still be attached to this section. For instance, we
|
||
encountered on sparc-solaris 2.10 a shared library with an empty .bss
|
||
section to which a symbol named "_end" was attached. The address
|
||
of this symbol still needs to be relocated. */
|
||
aflag = bfd_section_flags (asect);
|
||
if (!(aflag & SEC_ALLOC))
|
||
return;
|
||
|
||
(*table_pp)->owner = NULL;
|
||
(*table_pp)->the_bfd_section = asect;
|
||
(*table_pp)->addr = bfd_section_vma (asect);
|
||
(*table_pp)->endaddr = (*table_pp)->addr + bfd_section_size (asect);
|
||
(*table_pp)++;
|
||
}
|
||
|
||
/* See exec.h. */
|
||
|
||
void
|
||
clear_section_table (struct target_section_table *table)
|
||
{
|
||
xfree (table->sections);
|
||
table->sections = table->sections_end = NULL;
|
||
}
|
||
|
||
/* Resize section table TABLE by ADJUSTMENT.
|
||
ADJUSTMENT may be negative, in which case the caller must have already
|
||
removed the sections being deleted.
|
||
Returns the old size. */
|
||
|
||
static int
|
||
resize_section_table (struct target_section_table *table, int adjustment)
|
||
{
|
||
int old_count;
|
||
int new_count;
|
||
|
||
old_count = table->sections_end - table->sections;
|
||
|
||
new_count = adjustment + old_count;
|
||
|
||
if (new_count)
|
||
{
|
||
table->sections = XRESIZEVEC (struct target_section, table->sections,
|
||
new_count);
|
||
table->sections_end = table->sections + new_count;
|
||
}
|
||
else
|
||
clear_section_table (table);
|
||
|
||
return old_count;
|
||
}
|
||
|
||
/* Builds a section table, given args BFD, SECTABLE_PTR, SECEND_PTR.
|
||
Returns 0 if OK, 1 on error. */
|
||
|
||
int
|
||
build_section_table (struct bfd *some_bfd, struct target_section **start,
|
||
struct target_section **end)
|
||
{
|
||
unsigned count;
|
||
|
||
count = bfd_count_sections (some_bfd);
|
||
if (*start)
|
||
xfree (* start);
|
||
*start = XNEWVEC (struct target_section, count);
|
||
*end = *start;
|
||
bfd_map_over_sections (some_bfd, add_to_section_table, (char *) end);
|
||
|
||
gdb_assert (*end <= *start + count);
|
||
|
||
/* We could realloc the table, but it probably loses for most files. */
|
||
return 0;
|
||
}
|
||
|
||
/* Add the sections array defined by [SECTIONS..SECTIONS_END[ to the
|
||
current set of target sections. */
|
||
|
||
void
|
||
add_target_sections (void *owner,
|
||
struct target_section *sections,
|
||
struct target_section *sections_end)
|
||
{
|
||
int count;
|
||
struct target_section_table *table = current_target_sections;
|
||
|
||
count = sections_end - sections;
|
||
|
||
if (count > 0)
|
||
{
|
||
int space = resize_section_table (table, count);
|
||
int i;
|
||
|
||
for (i = 0; i < count; ++i)
|
||
{
|
||
table->sections[space + i] = sections[i];
|
||
table->sections[space + i].owner = owner;
|
||
}
|
||
|
||
scoped_restore_current_pspace_and_thread restore_pspace_thread;
|
||
program_space *curr_pspace = current_program_space;
|
||
|
||
/* If these are the first file sections we can provide memory
|
||
from, push the file_stratum target. Must do this in all
|
||
inferiors sharing the program space. */
|
||
for (inferior *inf : all_inferiors ())
|
||
{
|
||
if (inf->pspace != curr_pspace)
|
||
continue;
|
||
|
||
if (inf->target_is_pushed (&exec_ops))
|
||
continue;
|
||
|
||
switch_to_inferior_no_thread (inf);
|
||
push_target (&exec_ops);
|
||
}
|
||
}
|
||
}
|
||
|
||
/* Add the sections of OBJFILE to the current set of target sections. */
|
||
|
||
void
|
||
add_target_sections_of_objfile (struct objfile *objfile)
|
||
{
|
||
struct target_section_table *table = current_target_sections;
|
||
struct obj_section *osect;
|
||
int space;
|
||
unsigned count = 0;
|
||
struct target_section *ts;
|
||
|
||
if (objfile == NULL)
|
||
return;
|
||
|
||
/* Compute the number of sections to add. */
|
||
ALL_OBJFILE_OSECTIONS (objfile, osect)
|
||
{
|
||
if (bfd_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_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 of each
|
||
inferior sharing the program space. */
|
||
if (old_count + (dest - src) == 0)
|
||
{
|
||
scoped_restore_current_pspace_and_thread restore_pspace_thread;
|
||
program_space *curr_pspace = current_program_space;
|
||
|
||
for (inferior *inf : all_inferiors ())
|
||
{
|
||
if (inf->pspace != curr_pspace)
|
||
continue;
|
||
|
||
if (inf->pspace->target_sections.sections
|
||
!= inf->pspace->target_sections.sections_end)
|
||
continue;
|
||
|
||
switch_to_inferior_no_thread (inf);
|
||
unpush_target (&exec_ops);
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
/* See exec.h. */
|
||
|
||
void
|
||
exec_on_vfork ()
|
||
{
|
||
if (current_program_space->target_sections.sections
|
||
!= current_program_space->target_sections.sections_end)
|
||
push_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_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;
|
||
}
|
||
|
||
/* Return 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. */
|
||
|
||
static std::vector<mem_range>
|
||
section_table_available_memory (CORE_ADDR memaddr, ULONGEST len,
|
||
struct target_section *sections,
|
||
struct target_section *sections_end)
|
||
{
|
||
std::vector<mem_range> memory;
|
||
|
||
for (target_section *p = sections; p < sections_end; p++)
|
||
{
|
||
if ((bfd_section_flags (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;
|
||
|
||
lo1 = memaddr;
|
||
hi1 = memaddr + len;
|
||
|
||
lo2 = p->addr;
|
||
hi2 = p->endaddr;
|
||
|
||
CORE_ADDR start = std::max (lo1, lo2);
|
||
int length = std::min (hi1, hi2) - start;
|
||
|
||
memory.emplace_back (start, length);
|
||
}
|
||
}
|
||
|
||
return memory;
|
||
}
|
||
|
||
enum target_xfer_status
|
||
section_table_read_available_memory (gdb_byte *readbuf, ULONGEST offset,
|
||
ULONGEST len, ULONGEST *xfered_len)
|
||
{
|
||
target_section_table *table = target_get_section_table (&exec_ops);
|
||
std::vector<mem_range> available_memory
|
||
= section_table_available_memory (offset, len,
|
||
table->sections, table->sections_end);
|
||
|
||
normalize_mem_ranges (&available_memory);
|
||
|
||
for (const mem_range &r : available_memory)
|
||
{
|
||
if (mem_ranges_overlap (r.start, r.length, offset, len))
|
||
{
|
||
CORE_ADDR end;
|
||
enum target_xfer_status status;
|
||
|
||
/* Get the intersection window. */
|
||
end = std::min<CORE_ADDR> (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;
|
||
}
|
||
return status;
|
||
}
|
||
}
|
||
|
||
*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;
|
||
|
||
gdb_assert (len != 0);
|
||
|
||
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. */
|
||
}
|
||
|
||
struct target_section_table *
|
||
exec_target::get_section_table ()
|
||
{
|
||
return current_target_sections;
|
||
}
|
||
|
||
enum target_xfer_status
|
||
exec_target::xfer_partial (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 = get_section_table ();
|
||
|
||
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`%ps', ",
|
||
styled_string (file_name_style.style (),
|
||
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;
|
||
|
||
if ((bfd_section_flags (psect) & (SEC_ALLOC | SEC_LOAD))
|
||
!= (SEC_ALLOC | SEC_LOAD))
|
||
continue;
|
||
|
||
if (bfd_section_vma (psect) <= abfd->start_address
|
||
&& abfd->start_address < (bfd_section_vma (psect)
|
||
+ bfd_section_size (psect)))
|
||
{
|
||
displacement = p->addr - bfd_section_vma (psect);
|
||
break;
|
||
}
|
||
}
|
||
if (p == t->sections_end)
|
||
warning (_("Cannot find section for the entry point of %ps."),
|
||
styled_string (file_name_style.style (),
|
||
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 (psect));
|
||
if (pbfd != abfd)
|
||
printf_filtered (" in %ps",
|
||
styled_string (file_name_style.style (),
|
||
bfd_get_filename (pbfd)));
|
||
printf_filtered ("\n");
|
||
}
|
||
}
|
||
|
||
void
|
||
exec_target::files_info ()
|
||
{
|
||
if (exec_bfd)
|
||
print_section_info (current_target_sections, exec_bfd);
|
||
else
|
||
puts_filtered (_("\t<no file loaded>\n"));
|
||
}
|
||
|
||
static void
|
||
set_section_command (const char *args, int from_tty)
|
||
{
|
||
struct target_section *p;
|
||
const 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->the_bfd_section), seclen)
|
||
&& bfd_section_name (p->the_bfd_section)[seclen] == '\0')
|
||
{
|
||
offset = secaddr - p->addr;
|
||
p->addr += offset;
|
||
p->endaddr += offset;
|
||
if (from_tty)
|
||
exec_ops.files_info ();
|
||
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;
|
||
}
|
||
}
|
||
}
|
||
|
||
bool
|
||
exec_target::has_memory ()
|
||
{
|
||
/* We can provide memory if we have any file/target sections to read
|
||
from. */
|
||
return (current_target_sections->sections
|
||
!= current_target_sections->sections_end);
|
||
}
|
||
|
||
char *
|
||
exec_target::make_corefile_notes (bfd *obfd, int *note_size)
|
||
{
|
||
error (_("Can't create a corefile"));
|
||
}
|
||
|
||
int
|
||
exec_target::find_memory_regions (find_memory_region_ftype func, void *data)
|
||
{
|
||
return objfile_find_memory_regions (this, func, data);
|
||
}
|
||
|
||
void _initialize_exec ();
|
||
void
|
||
_initialize_exec ()
|
||
{
|
||
struct cmd_list_element *c;
|
||
|
||
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_setshow_enum_cmd ("exec-file-mismatch", class_support,
|
||
exec_file_mismatch_names,
|
||
&exec_file_mismatch,
|
||
_("\
|
||
Set exec-file-mismatch handling (ask|warn|off)."),
|
||
_("\
|
||
Show exec-file-mismatch handling (ask|warn|off)."),
|
||
_("\
|
||
Specifies how to handle a mismatch between the current exec-file name\n\
|
||
loaded by GDB and the exec-file name automatically determined when attaching\n\
|
||
to a process:\n\n\
|
||
ask - warn the user and ask whether to load the determined exec-file.\n\
|
||
warn - warn the user, but do not change the exec-file.\n\
|
||
off - do not check for mismatch."),
|
||
set_exec_file_mismatch_command,
|
||
show_exec_file_mismatch_command,
|
||
&setlist, &showlist);
|
||
|
||
add_target (exec_target_info, exec_target_open, filename_completer);
|
||
}
|