350 lines
9.7 KiB
C
350 lines
9.7 KiB
C
/* Work with executable files, for GDB.
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Copyright (C) 1988, 1989 Free Software Foundation, Inc.
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This file is part of GDB.
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GDB 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 1, or (at your option)
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any later version.
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GDB 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 GDB; see the file COPYING. If not, write to
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the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
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#include <stdio.h>
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#include "defs.h"
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#include "param.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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#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 "gdbcore.h"
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#ifdef STILL_NEEDED_FOR_DECSTATION
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#include <sys/dir.h> /* For DECstations */
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#include <sys/user.h> /* After a.out.h */
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#include <sys/file.h>
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#endif
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#include <sys/stat.h>
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extern char *getenv();
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extern void child_create_inferior (), child_attach ();
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extern void symbol_file_command ();
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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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/* The base and bounds of the table of the exec file's sections. */
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struct section_table *exec_sections, *exec_sections_end;
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/* Forward decl */
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extern struct target_ops exec_ops;
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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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bfd_close (exec_bfd);
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exec_bfd = NULL;
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}
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}
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void
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exec_file_command (filename, from_tty)
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char *filename;
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int from_tty;
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{
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/* Remove any previous exec file. */
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unpush_target (&exec_ops);
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/* Now open and digest the file the user requested, if any. */
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if (filename)
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{
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char *scratch_pathname;
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int scratch_chan;
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filename = tilde_expand (filename);
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make_cleanup (free, filename);
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/* FIXME, if writeable is set, open for read/write. */
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scratch_chan = openp (getenv ("PATH"), 1, filename, O_RDONLY, 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, NULL, 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_error));
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if (!bfd_check_format (exec_bfd, bfd_object))
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error ("\"%s\": not in executable format: %s.",
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scratch_pathname, bfd_errmsg (bfd_error));
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#if FIXME
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/* This code needs to be incorporated into BFD */
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#ifdef COFF_ENCAPSULATE
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/* If we have a coff header, it can give us better values for
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text_start and exec_data_start. This is particularly useful
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for remote debugging of embedded systems. */
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if (N_FLAGS(exec_aouthdr) & N_FLAGS_COFF_ENCAPSULATE)
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{
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struct coffheader ch;
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int val;
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val = lseek (execchan, -(sizeof (AOUTHDR) + sizeof (ch)), 1);
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if (val == -1)
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perror_with_name (filename);
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val = myread (execchan, &ch, sizeof (ch));
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if (val < 0)
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perror_with_name (filename);
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text_start = ch.text_start;
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exec_data_start = ch.data_start;
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} else
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#endif
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{
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text_start =
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IS_OBJECT_FILE (exec_aouthdr) ? 0 : N_TXTADDR (exec_aouthdr);
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exec_data_start = IS_OBJECT_FILE (exec_aouthdr)
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? exec_aouthdr.a_text : N_DATADDR (exec_aouthdr);
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}
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#endif FIXME
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if (build_section_table (exec_bfd, &exec_sections, &exec_sections_end))
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error ("Can't find the file sections in `%s': %s",
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exec_bfd->filename, bfd_errmsg (bfd_error));
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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 ("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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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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void
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add_to_section_table (abfd, asect, table_pp)
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bfd *abfd;
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sec_ptr asect;
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struct section_table **table_pp;
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{
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flagword aflag;
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aflag = bfd_get_section_flags (abfd, asect);
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/* FIXME, we need to handle BSS segment here...it alloc's but doesn't load */
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if (!(aflag & SEC_LOAD))
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return;
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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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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 (count == 0)
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abort(); /* return 1? */
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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, 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 exec 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, abfd, sections, sections_end)
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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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bfd *abfd;
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struct section_table *sections, *sections_end;
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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) ();
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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 = sections; p < 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 (abfd, 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 (abfd, 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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/* The function called by target_xfer_memory via our target_ops */
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int
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exec_xfer_memory (memaddr, myaddr, len, write)
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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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{
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return xfer_memory (memaddr, myaddr, len, write,
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exec_bfd, exec_sections, exec_sections_end);
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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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static void
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exec_files_info ()
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{
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struct section_table *p;
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printf ("\tExecutable file `%s'.\n", bfd_get_filename(exec_bfd));
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for (p = exec_sections; p < exec_sections_end; p++)
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printf("\texecutable from 0x%08x to 0x%08x is %s\n",
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p->addr, p->endaddr,
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bfd_section_name (exec_bfd, p->sec_ptr));
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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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exec_file_command, exec_close, /* open, close */
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child_attach, 0, 0, 0, /* attach, detach, resume, wait, */
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0, 0, /* fetch_registers, store_registers, */
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0, 0, 0, /* prepare_to_store, conv_to, conv_from, */
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exec_xfer_memory, exec_files_info,
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0, 0, /* insert_breakpoint, remove_breakpoint, */
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0, 0, 0, 0, 0, /* terminal stuff */
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0, 0, 0, 0, 0, /* kill, load, add_syms, call fn, lookup sym */
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child_create_inferior,
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0, /* mourn_inferior */
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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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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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add_com ("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.");
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add_com ("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.");
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add_target (&exec_ops);
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}
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