678 lines
19 KiB
C
678 lines
19 KiB
C
/* Work with executable files, for GDB.
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Copyright 1988, 1989, 1991, 1992, 1993, 1994 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 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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#include "symfile.h"
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#include "objfiles.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 "gdb_string.h"
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#include "gdbcore.h"
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#include <ctype.h>
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#include "gdb_stat.h"
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#ifndef O_BINARY
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#define O_BINARY 0
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#endif
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#include "xcoffsolib.h"
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struct vmap *map_vmap PARAMS ((bfd *, bfd *));
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/* Prototypes for local functions */
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static void add_to_section_table PARAMS ((bfd *, sec_ptr, PTR));
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static void exec_close PARAMS ((int));
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static void file_command PARAMS ((char *, int));
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static void set_section_command PARAMS ((char *, int));
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static void 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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struct vmap *vmap;
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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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int need_symtab_cleanup = 0;
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struct vmap *vp, *nxt;
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for (nxt = vmap; nxt != NULL; )
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{
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vp = nxt;
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nxt = vp->nxt;
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/* if there is an objfile associated with this bfd,
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free_objfile() will do proper cleanup of objfile *and* bfd. */
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if (vp->objfile)
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{
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free_objfile (vp->objfile);
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need_symtab_cleanup = 1;
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}
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else if (vp->bfd != exec_bfd)
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/* FIXME-leak: We should be freeing vp->name too, I think. */
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if (!bfd_close (vp->bfd))
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warning ("cannot close \"%s\": %s",
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vp->name, bfd_errmsg (bfd_get_error ()));
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/* FIXME: This routine is #if 0'd in symfile.c. What should we
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be doing here? Should we just free everything in
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vp->objfile->symtabs? Should free_objfile do that?
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FIXME-as-well: free_objfile already free'd vp->name, so it isn't
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valid here. */
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free_named_symtabs (vp->name);
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free (vp);
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}
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vmap = NULL;
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if (exec_bfd)
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{
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char *name = bfd_get_filename (exec_bfd);
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if (!bfd_close (exec_bfd))
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warning ("cannot close \"%s\": %s",
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name, bfd_errmsg (bfd_get_error ()));
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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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{
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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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argv = buildargv (args);
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if (argv == NULL)
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nomem (0);
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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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error ("no exec file name was specified");
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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 ("\"%s\": could not open as an executable file: %s",
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scratch_pathname, bfd_errmsg (bfd_get_error ()));
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/* At this point, scratch_pathname and exec_bfd->name both point to the
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same malloc'd string. However exec_close() will attempt to free it
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via the exec_bfd->name pointer, so we need to make another copy and
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leave exec_bfd as the new owner of the original copy. */
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scratch_pathname = strdup (scratch_pathname);
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make_cleanup (free, scratch_pathname);
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if (!bfd_check_format (exec_bfd, bfd_object))
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{
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/* Make sure to close exec_bfd, or else "run" might try to use
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it. */
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exec_close (0);
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error ("\"%s\": not in executable format: %s",
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scratch_pathname, bfd_errmsg (bfd_get_error ()));
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}
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/* FIXME - This should only be run for RS6000, but the ifdef is a poor
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way to accomplish. */
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#ifdef IBM6000_TARGET
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/* Setup initial vmap. */
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map_vmap (exec_bfd, 0);
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if (vmap == NULL)
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{
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/* Make sure to close exec_bfd, or else "run" might try to use
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it. */
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exec_close (0);
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error ("\"%s\": can't find the file sections: %s",
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scratch_pathname, bfd_errmsg (bfd_get_error ()));
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}
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#endif /* IBM6000_TARGET */
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if (build_section_table (exec_bfd, &exec_ops.to_sections,
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&exec_ops.to_sections_end))
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{
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/* Make sure to close exec_bfd, or else "run" might try to use
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it. */
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exec_close (0);
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error ("\"%s\": can't find the file sections: %s",
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scratch_pathname, bfd_errmsg (bfd_get_error ()));
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}
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#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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/* FIXME: The comment above does not match the code. The code
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checks for sections with are either code *or* readonly. */
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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->the_bfd_section)
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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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set_endian_from_file (exec_bfd);
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push_target (&exec_ops);
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/* Tell display code (if any) about the changed file name. */
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if (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)->the_bfd_section = asect;
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(*table_pp)->addr = bfd_section_vma (abfd, asect);
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(*table_pp)->endaddr = (*table_pp)->addr + bfd_section_size (abfd, asect);
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(*table_pp)++;
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}
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/* Builds a section table, given args BFD, SECTABLE_PTR, SECEND_PTR.
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Returns 0 if OK, 1 on error. */
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int
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build_section_table (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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static void
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bfdsec_to_vmap(abfd, sect, arg3)
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bfd *abfd;
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sec_ptr sect;
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PTR arg3;
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{
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struct vmap_and_bfd *vmap_bfd = (struct vmap_and_bfd *) arg3;
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struct vmap *vp;
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vp = vmap_bfd->pvmap;
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if ((bfd_get_section_flags (abfd, sect) & SEC_LOAD) == 0)
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return;
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if (STREQ (bfd_section_name (abfd, sect), ".text"))
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{
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vp->tstart = 0;
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vp->tend = vp->tstart + bfd_section_size (abfd, sect);
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/* When it comes to this adjustment value, in contrast to our previous
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belief shared objects should behave the same as the main load segment.
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This is the offset from the beginning of text section to the first
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real instruction. */
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vp->tadj = sect->filepos - bfd_section_vma (abfd, sect);
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}
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else if (STREQ (bfd_section_name (abfd, sect), ".data"))
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{
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vp->dstart = 0;
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vp->dend = vp->dstart + bfd_section_size (abfd, sect);
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}
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/* Silently ignore other types of sections. (FIXME?) */
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}
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/* Make a vmap for ABFD which might be a member of the archive ARCH.
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Return the new vmap. */
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struct vmap *
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map_vmap (abfd, arch)
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bfd *abfd;
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bfd *arch;
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{
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struct vmap_and_bfd vmap_bfd;
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struct vmap *vp, **vpp;
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vp = (struct vmap *) xmalloc (sizeof (*vp));
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memset ((char *) vp, '\0', sizeof (*vp));
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vp->nxt = 0;
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vp->bfd = abfd;
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vp->name = bfd_get_filename (arch ? arch : abfd);
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vp->member = arch ? bfd_get_filename (abfd) : "";
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vmap_bfd.pbfd = arch;
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vmap_bfd.pvmap = vp;
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bfd_map_over_sections (abfd, bfdsec_to_vmap, &vmap_bfd);
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/* Find the end of the list and append. */
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for (vpp = &vmap; *vpp; vpp = &(*vpp)->nxt)
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;
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*vpp = vp;
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return vp;
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}
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/* Read or write the exec file.
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Args are address within a BFD file, address within gdb address-space,
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length, and a flag indicating whether to read or write.
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Result is a length:
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0: We cannot handle this address and length.
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> 0: We have handled N bytes starting at this address.
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(If N == length, we did it all.) We might be able
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to handle more bytes beyond this length, but no
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promises.
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< 0: We cannot handle this address, but if somebody
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else handles (-N) bytes, we can start from there.
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The same routine is used to handle both core and exec files;
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we just tail-call it with more arguments to select between them. */
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int
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xfer_memory (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->the_bfd_section, myaddr,
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memaddr - p->addr, len);
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return (res != 0) ? 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->the_bfd_section, myaddr,
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memaddr - p->addr, len);
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return (res != 0) ? 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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if (abfd == exec_bfd)
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{
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printf_filtered ("\tEntry point: ");
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print_address_numeric (bfd_get_start_address (abfd), 1, gdb_stdout);
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printf_filtered ("\n");
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}
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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->the_bfd_section->filepos, "08l"));
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printf_filtered (" is %s", bfd_section_name (p->bfd, p->the_bfd_section));
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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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}
|
||
|
||
static void
|
||
exec_files_info (t)
|
||
struct target_ops *t;
|
||
{
|
||
print_section_info (t, exec_bfd);
|
||
|
||
if (vmap)
|
||
{
|
||
struct vmap *vp;
|
||
|
||
printf_unfiltered ("\tMapping info for file `%s'.\n", vmap->name);
|
||
printf_unfiltered ("\t %8.8s %8.8s %8.8s %8.8s %8.8s %s\n",
|
||
"tstart", "tend", "dstart", "dend", "section",
|
||
"file(member)");
|
||
|
||
for (vp = vmap; vp; vp = vp->nxt)
|
||
printf_unfiltered ("\t0x%8.8x 0x%8.8x 0x%8.8x 0x%8.8x %s%s%s%s\n",
|
||
vp->tstart, vp->tend, vp->dstart, vp->dend, vp->name,
|
||
*vp->member ? "(" : "", vp->member,
|
||
*vp->member ? ")" : "");
|
||
}
|
||
}
|
||
|
||
static void
|
||
set_section_command (args, from_tty)
|
||
char *args;
|
||
int from_tty;
|
||
{
|
||
struct section_table *p;
|
||
char *secname;
|
||
unsigned seclen;
|
||
unsigned long secaddr;
|
||
char secprint[100];
|
||
long offset;
|
||
|
||
if (args == 0)
|
||
error ("Must specify section name and its virtual address");
|
||
|
||
/* Parse out section name */
|
||
for (secname = args; !isspace(*args); args++) ;
|
||
seclen = args - secname;
|
||
|
||
/* Parse out new virtual address */
|
||
secaddr = parse_and_eval_address (args);
|
||
|
||
for (p = exec_ops.to_sections; p < exec_ops.to_sections_end; p++) {
|
||
if (!strncmp (secname, bfd_section_name (exec_bfd, p->the_bfd_section), seclen)
|
||
&& bfd_section_name (exec_bfd, p->the_bfd_section)[seclen] == '\0') {
|
||
offset = secaddr - p->addr;
|
||
p->addr += offset;
|
||
p->endaddr += offset;
|
||
if (from_tty)
|
||
exec_files_info(&exec_ops);
|
||
return;
|
||
}
|
||
}
|
||
if (seclen >= sizeof (secprint))
|
||
seclen = sizeof (secprint) - 1;
|
||
strncpy (secprint, secname, seclen);
|
||
secprint[seclen] = '\0';
|
||
error ("Section %s not found", secprint);
|
||
}
|
||
|
||
/* If 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 (addr, contents)
|
||
CORE_ADDR addr;
|
||
char *contents;
|
||
{
|
||
return 0;
|
||
}
|
||
|
||
struct target_ops exec_ops = {
|
||
"exec", /* to_shortname */
|
||
"Local exec file", /* to_longname */
|
||
"Use an executable file as a target.\n\
|
||
Specify the filename of the executable file.", /* to_doc */
|
||
exec_file_command, /* to_open */
|
||
exec_close, /* to_close */
|
||
find_default_attach, /* to_attach */
|
||
0, /* to_detach */
|
||
0, /* to_resume */
|
||
0, /* to_wait */
|
||
0, /* to_fetch_registers */
|
||
0, /* to_store_registers */
|
||
0, /* to_prepare_to_store */
|
||
xfer_memory, /* to_xfer_memory */
|
||
exec_files_info, /* to_files_info */
|
||
ignore, /* to_insert_breakpoint */
|
||
ignore, /* to_remove_breakpoint */
|
||
0, /* to_terminal_init */
|
||
0, /* to_terminal_inferior */
|
||
0, /* to_terminal_ours_for_output */
|
||
0, /* to_terminal_ours */
|
||
0, /* to_terminal_info */
|
||
0, /* to_kill */
|
||
0, /* to_load */
|
||
0, /* to_lookup_symbol */
|
||
find_default_create_inferior, /* to_create_inferior */
|
||
0, /* to_mourn_inferior */
|
||
0, /* to_can_run */
|
||
0, /* to_notice_signals */
|
||
0, /* to_thread_alive */
|
||
0, /* to_stop */
|
||
file_stratum, /* to_stratum */
|
||
0, /* to_next */
|
||
0, /* to_has_all_memory */
|
||
1, /* to_has_memory */
|
||
0, /* to_has_stack */
|
||
0, /* to_has_registers */
|
||
0, /* to_has_execution */
|
||
0, /* to_sections */
|
||
0, /* to_sections_end */
|
||
OPS_MAGIC, /* to_magic */
|
||
};
|
||
|
||
void
|
||
_initialize_exec()
|
||
{
|
||
struct cmd_list_element *c;
|
||
|
||
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);
|
||
c->completer = 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);
|
||
c->completer = 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_show_from_set
|
||
(add_set_cmd ("write", class_support, var_boolean, (char *)&write_files,
|
||
"Set writing into executable and core files.",
|
||
&setlist),
|
||
&showlist);
|
||
|
||
add_target (&exec_ops);
|
||
}
|