504 lines
14 KiB
C
504 lines
14 KiB
C
/* Work with executable files, for GDB.
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Copyright 1988, 1989, 1991, 1992 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 2 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, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
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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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#ifdef USG
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#include <sys/types.h>
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#endif
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#include <sys/param.h>
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#include <fcntl.h>
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#include <string.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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#ifndef O_BINARY
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#define O_BINARY 0
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#endif
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/* Prototypes for local functions */
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static void
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add_to_section_table PARAMS ((bfd *, sec_ptr, PTR));
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static void
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exec_close PARAMS ((int));
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static void
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file_command PARAMS ((char *, int));
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static void
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set_section_command PARAMS ((char *, int));
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static void
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exec_files_info PARAMS ((struct target_ops *));
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extern int info_verbose;
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/* The Binary File Descriptor handle for the executable file. */
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bfd *exec_bfd = NULL;
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/* Whether to open exec and core files read-only or read-write. */
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int write_files = 0;
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/* Text start and end addresses (KLUDGE) if needed */
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#ifdef NEED_TEXT_START_END
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CORE_ADDR text_start = 0;
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CORE_ADDR text_end = 0;
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#endif
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/* Forward decl */
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extern struct target_ops exec_ops;
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/* ARGSUSED */
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static void
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exec_close (quitting)
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int quitting;
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{
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if (exec_bfd) {
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char *name = bfd_get_filename (exec_bfd);
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bfd_close (exec_bfd);
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free (name);
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exec_bfd = NULL;
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}
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if (exec_ops.to_sections) {
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free ((PTR)exec_ops.to_sections);
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exec_ops.to_sections = NULL;
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exec_ops.to_sections_end = NULL;
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}
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}
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/* 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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void
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exec_file_command (args, from_tty)
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char *args;
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int from_tty;
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{
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char **argv;
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char *filename;
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target_preopen (from_tty);
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/* Remove any previous exec file. */
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unpush_target (&exec_ops);
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/* Now open and digest the file the user requested, if any. */
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if (args)
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{
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char *scratch_pathname;
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int scratch_chan;
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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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if ((argv = buildargv (args)) == NULL)
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{
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nomem (0);
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}
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make_cleanup (freeargv, (char *) argv);
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for (; (*argv != NULL) && (**argv == '-'); argv++) {;}
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if (*argv == NULL)
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{
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error ("no exec file name was specified");
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}
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filename = tilde_expand (*argv);
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make_cleanup (free, filename);
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scratch_chan = openp (getenv ("PATH"), 1, filename,
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write_files? O_RDWR|O_BINARY: O_RDONLY|O_BINARY, 0,
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&scratch_pathname);
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if (scratch_chan < 0)
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perror_with_name (filename);
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exec_bfd = bfd_fdopenr (scratch_pathname, gnutarget, scratch_chan);
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if (!exec_bfd)
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error ("Could not open `%s' as an executable file: %s",
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scratch_pathname, bfd_errmsg (bfd_get_error ()));
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if (!bfd_check_format (exec_bfd, bfd_object))
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{
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/* Make sure to close exec_bfd, or else "run" might try to use
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it. */
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exec_close (0);
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error ("\"%s\": not in executable format: %s.",
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scratch_pathname, bfd_errmsg (bfd_get_error ()));
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}
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if (build_section_table (exec_bfd, &exec_ops.to_sections,
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&exec_ops.to_sections_end))
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{
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/* Make sure to close exec_bfd, or else "run" might try to use
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it. */
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exec_close (0);
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error ("Can't find the file sections in `%s': %s",
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exec_bfd->filename, bfd_errmsg (bfd_get_error ()));
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}
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#ifdef NEED_TEXT_START_END
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/* text_end is sometimes used for where to put call dummies. A
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few ports use these for other purposes too. */
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{
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struct section_table *p;
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/* Set text_start to the lowest address of the start of any
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readonly code section and set text_end to the highest
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address of the end of any readonly code section. */
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text_start = ~(CORE_ADDR)0;
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text_end = (CORE_ADDR)0;
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for (p = exec_ops.to_sections; p < exec_ops.to_sections_end; p++)
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if (bfd_get_section_flags (p->bfd, p->sec_ptr)
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& (SEC_CODE | SEC_READONLY))
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{
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if (text_start > p->addr)
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text_start = p->addr;
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if (text_end < p->endaddr)
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text_end = p->endaddr;
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}
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}
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#endif
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validate_files ();
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push_target (&exec_ops);
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/* Tell display code (if any) about the changed file name. */
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if (exec_file_display_hook)
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(*exec_file_display_hook) (filename);
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}
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else if (from_tty)
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printf_unfiltered ("No exec file now.\n");
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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 (arg, from_tty)
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char *arg;
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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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}
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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 (abfd, asect, table_pp_char)
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bfd *abfd;
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sec_ptr asect;
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PTR table_pp_char;
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{
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struct section_table **table_pp = (struct section_table **)table_pp_char;
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flagword aflag;
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aflag = bfd_get_section_flags (abfd, asect);
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if (!(aflag & SEC_ALLOC))
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return;
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if (0 == bfd_section_size (abfd, asect))
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return;
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(*table_pp)->bfd = abfd;
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(*table_pp)->sec_ptr = asect;
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(*table_pp)->addr = bfd_section_vma (abfd, asect);
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(*table_pp)->endaddr = (*table_pp)->addr + bfd_section_size (abfd, asect);
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(*table_pp)++;
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}
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/* Builds a section table, given args BFD, SECTABLE_PTR, SECEND_PTR.
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Returns 0 if OK, 1 on error. */
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int
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build_section_table (some_bfd, start, end)
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bfd *some_bfd;
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struct section_table **start, **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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free ((PTR)*start);
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*start = (struct section_table *) xmalloc (count * sizeof (**start));
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*end = *start;
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bfd_map_over_sections (some_bfd, add_to_section_table, (char *)end);
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if (*end > *start + count)
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abort();
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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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/* Read or write the exec file.
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Args are address within a BFD file, address within gdb address-space,
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length, and a flag indicating whether to read or write.
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Result is a length:
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0: We cannot handle this address and length.
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> 0: We have handled N bytes starting at this address.
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(If N == length, we did it all.) We might be able
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to handle more bytes beyond this length, but no
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promises.
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< 0: We cannot handle this address, but if somebody
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else handles (-N) bytes, we can start from there.
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The same routine is used to handle both core and exec files;
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we just tail-call it with more arguments to select between them. */
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int
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xfer_memory (memaddr, myaddr, len, write, target)
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CORE_ADDR memaddr;
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char *myaddr;
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int len;
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int write;
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struct target_ops *target;
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{
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boolean res;
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struct section_table *p;
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CORE_ADDR nextsectaddr, memend;
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boolean (*xfer_fn) PARAMS ((bfd *, sec_ptr, PTR, file_ptr, bfd_size_type));
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if (len <= 0)
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abort();
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memend = memaddr + len;
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xfer_fn = write? bfd_set_section_contents: bfd_get_section_contents;
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nextsectaddr = memend;
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for (p = target->to_sections; p < target->to_sections_end; p++)
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{
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if (p->addr <= memaddr)
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if (p->endaddr >= memend)
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{
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/* Entire transfer is within this section. */
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res = xfer_fn (p->bfd, p->sec_ptr, myaddr, memaddr - p->addr, len);
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return (res != false)? len: 0;
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}
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else if (p->endaddr <= memaddr)
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{
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/* This section ends before the transfer starts. */
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continue;
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}
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else
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{
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/* This section overlaps the transfer. Just do half. */
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len = p->endaddr - memaddr;
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res = xfer_fn (p->bfd, p->sec_ptr, myaddr, memaddr - p->addr, len);
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return (res != false)? len: 0;
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}
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else if (p->addr < nextsectaddr)
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nextsectaddr = p->addr;
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}
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if (nextsectaddr >= memend)
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return 0; /* We can't help */
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else
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return - (nextsectaddr - memaddr); /* Next boundary where we can help */
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}
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#ifdef FIXME
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#ifdef REG_STACK_SEGMENT
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/* MOVE TO BFD... */
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/* Pyramids and AM29000s have an extra segment in the virtual address space
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for the (control) stack of register-window frames. The AM29000 folk
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call it the "register stack" rather than the "memory stack". */
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else if (memaddr >= reg_stack_start && memaddr < reg_stack_end)
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{
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i = min (len, reg_stack_end - memaddr);
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fileptr = memaddr - reg_stack_start + reg_stack_offset;
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wanna_xfer = coredata;
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}
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#endif /* REG_STACK_SEGMENT */
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#endif /* FIXME */
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void
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print_section_info (t, abfd)
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struct target_ops *t;
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bfd *abfd;
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{
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struct section_table *p;
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printf_filtered ("\t`%s', ", bfd_get_filename(abfd));
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wrap_here (" ");
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printf_filtered ("file type %s.\n", bfd_get_target(abfd));
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printf_filtered ("\tEntry point: ");
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print_address_numeric (bfd_get_start_address (exec_bfd), gdb_stdout);
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printf_filtered ("\n");
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for (p = t->to_sections; p < t->to_sections_end; p++)
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{
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/* FIXME-32x64 need a print_address_numeric with field width */
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printf_filtered ("\t%s", local_hex_string_custom ((unsigned long) p->addr, "08l"));
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printf_filtered (" - %s", local_hex_string_custom ((unsigned long) p->endaddr, "08l"));
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if (info_verbose)
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printf_filtered (" @ %s",
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local_hex_string_custom ((unsigned long) p->sec_ptr->filepos, "08l"));
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printf_filtered (" is %s", bfd_section_name (p->bfd, p->sec_ptr));
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if (p->bfd != abfd)
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{
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printf_filtered (" in %s", bfd_get_filename (p->bfd));
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}
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printf_filtered ("\n");
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}
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}
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static void
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exec_files_info (t)
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struct target_ops *t;
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{
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print_section_info (t, exec_bfd);
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}
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static void
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set_section_command (args, from_tty)
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char *args;
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int from_tty;
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{
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struct section_table *p;
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char *secname;
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unsigned seclen;
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unsigned long secaddr;
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char secprint[100];
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long offset;
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if (args == 0)
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error ("Must specify section name and its virtual address");
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/* Parse out section name */
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for (secname = args; !isspace(*args); args++) ;
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seclen = args - secname;
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/* Parse out new virtual address */
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secaddr = parse_and_eval_address (args);
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for (p = exec_ops.to_sections; p < exec_ops.to_sections_end; p++) {
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if (!strncmp (secname, bfd_section_name (exec_bfd, p->sec_ptr), seclen)
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&& bfd_section_name (exec_bfd, p->sec_ptr)[seclen] == '\0') {
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offset = secaddr - p->addr;
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p->addr += offset;
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p->endaddr += offset;
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if (from_tty)
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exec_files_info(&exec_ops);
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return;
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}
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}
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if (seclen >= sizeof (secprint))
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seclen = sizeof (secprint) - 1;
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strncpy (secprint, secname, seclen);
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secprint[seclen] = '\0';
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error ("Section %s not found", secprint);
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}
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/* If mourn is being called in all the right places, this could be say
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`gdb internal error' (since generic_mourn calls breakpoint_init_inferior). */
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static int
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ignore (addr, contents)
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CORE_ADDR addr;
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char *contents;
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{
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return 0;
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}
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struct target_ops exec_ops = {
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"exec", "Local exec file",
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"Use an executable file as a target.\n\
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Specify the filename of the executable file.",
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exec_file_command, exec_close, /* open, close */
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find_default_attach, 0, 0, 0, /* attach, detach, resume, wait, */
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0, 0, /* fetch_registers, store_registers, */
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0, /* prepare_to_store, */
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xfer_memory, exec_files_info,
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ignore, ignore, /* insert_breakpoint, remove_breakpoint, */
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0, 0, 0, 0, 0, /* terminal stuff */
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0, 0, /* kill, load */
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0, /* lookup sym */
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find_default_create_inferior,
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0, /* mourn_inferior */
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0, /* can_run */
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0, /* notice_signals */
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file_stratum, 0, /* next */
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0, 1, 0, 0, 0, /* all mem, mem, stack, regs, exec */
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0, 0, /* section pointers */
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OPS_MAGIC, /* Always the last thing */
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};
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void
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_initialize_exec()
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{
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struct cmd_list_element *c;
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c = add_cmd ("file", class_files, file_command,
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"Use FILE as program to be debugged.\n\
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It is read for its symbols, for getting the contents of pure memory,\n\
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and it is the program executed when you use the `run' command.\n\
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If FILE cannot be found as specified, your execution directory path\n\
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($PATH) is searched for a command of that name.\n\
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No arg means to have no executable file and no symbols.", &cmdlist);
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c->completer = filename_completer;
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c = add_cmd ("exec-file", class_files, exec_file_command,
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"Use FILE as program for getting contents of pure memory.\n\
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If FILE cannot be found as specified, your execution directory path\n\
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is searched for a command of that name.\n\
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No arg means have no executable file.", &cmdlist);
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c->completer = filename_completer;
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add_com ("section", class_files, set_section_command,
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"Change the base address of section SECTION of the exec file to ADDR.\n\
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This can be used if the exec file does not contain section addresses,\n\
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(such as in the a.out format), or when the addresses specified in the\n\
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file itself are wrong. Each section must be changed separately. The\n\
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``info files'' command lists all the sections and their addresses.");
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add_show_from_set
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(add_set_cmd ("write", class_support, var_boolean, (char *)&write_files,
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"Set writing into executable and core files.",
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&setlist),
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&showlist);
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add_target (&exec_ops);
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}
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