ea8c7ac7d0
This is a greatly pared down version of the full gdb-4.12, all the config stuff has been removed and the supporting libraries have been stripped to a minimum. This is a 1.1.5 only port, I'll do a more complete port for 2.0 which will have all the config stuff and will install the gnu support libraries as system libraries like we do for readline. There wasn't much point for 1.1.5 since only gdb would use them so I went for saving space instead. For 2.0 I'll config all the other gnu tools to use them as well.
259 lines
6.9 KiB
C
259 lines
6.9 KiB
C
/* Generic BFD support for file formats.
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Copyright (C) 1990-1991 Free Software Foundation, Inc.
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Written by Cygnus Support.
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This file is part of BFD, the Binary File Descriptor library.
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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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/*
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SECTION
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File Formats
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A format is a BFD concept of high level file contents. The
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formats supported by BFD are:
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o bfd_object
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The BFD may contain data, symbols, relocations and debug info.
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o bfd_archive
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The BFD contains other BFDs and an optional index.
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o bfd_core
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The BFD contains the result of an executable core dump.
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*/
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#include "bfd.h"
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#include "sysdep.h"
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#include "libbfd.h"
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extern bfd_target *target_vector[];
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extern bfd_target *default_vector[];
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/*
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FUNCTION
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bfd_check_format
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SYNOPSIS
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boolean bfd_check_format(bfd *abfd, bfd_format format);
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DESCRIPTION
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This routine is supplied a BFD and a format. It attempts to
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verify if the file attached to the BFD is indeed compatible
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with the format specified (ie, one of <<bfd_object>>,
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<<bfd_archive>> or <<bfd_core>>).
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If the BFD has been set to a specific @var{target} before the
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call, only the named target and format combination will be
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checked. If the target has not been set, or has been set to
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<<default>> then all the known target backends will be
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interrogated to determine a match. If the default target
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matches, it is used. If not, exactly one target must recognize
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the file, or an error results.
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The function returns <<true>> on success, otherwise <<false>>
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with one of the following error codes:
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o invalid_operation -
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if <<format>> is not one of <<bfd_object>>, <<bfd_archive>> or
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<<bfd_core>>.
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o system_call_error -
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if an error occured during a read - even some file mismatches
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can cause system_call_errors
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o file_not_recognised -
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none of the backends recognised the file format
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o file_ambiguously_recognized -
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more than one backend recognised the file format.
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*/
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boolean
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DEFUN(bfd_check_format,(abfd, format),
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bfd *abfd AND
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bfd_format format)
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{
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bfd_target **target, *save_targ, *right_targ;
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int match_count;
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if (!bfd_read_p (abfd) ||
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((int)(abfd->format) < (int)bfd_unknown) ||
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((int)(abfd->format) >= (int)bfd_type_end)) {
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bfd_error = invalid_operation;
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return false;
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}
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if (abfd->format != bfd_unknown)
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return (abfd->format == format)? true: false;
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/* Since the target type was defaulted, check them
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all in the hope that one will be uniquely recognized. */
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save_targ = abfd->xvec;
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match_count = 0;
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right_targ = 0;
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/* presume the answer is yes */
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abfd->format = format;
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/* If the target type was explicitly specified, just check that target. */
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if (!abfd->target_defaulted) {
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bfd_seek (abfd, (file_ptr)0, SEEK_SET); /* rewind! */
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right_targ = BFD_SEND_FMT (abfd, _bfd_check_format, (abfd));
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if (right_targ) {
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abfd->xvec = right_targ; /* Set the target as returned */
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return true; /* File position has moved, BTW */
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}
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}
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for (target = target_vector; *target != NULL; target++) {
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bfd_target *temp;
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abfd->xvec = *target; /* Change BFD's target temporarily */
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bfd_seek (abfd, (file_ptr)0, SEEK_SET);
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/* If _bfd_check_format neglects to set bfd_error, assume wrong_format.
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We didn't used to even pay any attention to bfd_error, so I suspect
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that some _bfd_check_format might have this problem. */
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bfd_error = wrong_format;
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temp = BFD_SEND_FMT (abfd, _bfd_check_format, (abfd));
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if (temp) { /* This format checks out as ok! */
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right_targ = temp;
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match_count++;
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/* If this is the default target, accept it, even if other targets
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might match. People who want those other targets have to set
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the GNUTARGET variable. */
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if (temp == default_vector[0])
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{
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match_count = 1;
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break;
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}
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#ifdef GNU960
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/* Big- and little-endian b.out archives look the same, but it doesn't
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* matter: there is no difference in their headers, and member file byte
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* orders will (I hope) be handled appropriately by bfd. Ditto for big
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* and little coff archives. And the 4 coff/b.out object formats are
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* unambiguous. So accept the first match we find.
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*/
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break;
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#endif
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} else if (bfd_error != wrong_format) {
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abfd->xvec = save_targ;
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abfd->format = bfd_unknown;
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return false;
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}
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}
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if (match_count == 1) {
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abfd->xvec = right_targ; /* Change BFD's target permanently */
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return true; /* File position has moved, BTW */
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}
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abfd->xvec = save_targ; /* Restore original target type */
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abfd->format = bfd_unknown; /* Restore original format */
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bfd_error = ((match_count == 0) ? file_not_recognized :
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file_ambiguously_recognized);
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return false;
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}
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/*
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FUNCTION
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bfd_set_format
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SYNOPSIS
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boolean bfd_set_format(bfd *, bfd_format);
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DESCRIPTION
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This function sets the file format of the supplied BFD to the
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format requested. If the target set in the BFD does not
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support the format requested, the format is illegal or the BFD
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is not open for writing than an error occurs.
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*/
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boolean
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DEFUN(bfd_set_format,(abfd, format),
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bfd *abfd AND
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bfd_format format)
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{
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if (bfd_read_p (abfd) ||
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((int)abfd->format < (int)bfd_unknown) ||
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((int)abfd->format >= (int)bfd_type_end)) {
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bfd_error = invalid_operation;
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return false;
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}
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if (abfd->format != bfd_unknown)
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return (abfd->format == format) ? true:false;
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/* presume the answer is yes */
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abfd->format = format;
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if (!BFD_SEND_FMT (abfd, _bfd_set_format, (abfd))) {
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abfd->format = bfd_unknown;
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return false;
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}
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return true;
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}
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/*
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FUNCTION
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bfd_format_string
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SYNOPSIS
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CONST char *bfd_format_string(bfd_format);
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DESCRIPTION
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This function takes one argument, and enumerated type
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(bfd_format) and returns a pointer to a const string
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<<invalid>>, <<object>>, <<archive>>, <<core>> or <<unknown>>
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depending upon the value of the enumeration.
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*/
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CONST char *
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DEFUN(bfd_format_string,(format),
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bfd_format format)
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{
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if (((int)format <(int) bfd_unknown)
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|| ((int)format >=(int) bfd_type_end))
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return "invalid";
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switch (format) {
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case bfd_object:
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return "object"; /* linker/assember/compiler output */
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case bfd_archive:
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return "archive"; /* object archive file */
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case bfd_core:
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return "core"; /* core dump */
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default:
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return "unknown";
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}
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}
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