237 lines
6.9 KiB
C
237 lines
6.9 KiB
C
/* BFD back-end for a.out files encapsulated with COFF headers.
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Copyright (C) 1990, 1991 Free Software Foundation, Inc.
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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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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/* THIS MODULE IS NOT FINISHED. IT PROBABLY DOESN'T EVEN COMPILE. */
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#if 0
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#define TARGET_PAGE_SIZE 4096
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#define SEGMENT_SIZE TARGET_PAGE_SIZE
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#define TEXT_START_ADDR 0
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#define BYTES_IN_WORD 4
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#endif
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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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#include <aout/aout64.h>
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#include "aout/stab_gnu.h"
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#include "aout/ar.h"
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#include "libaout.h" /* BFD a.out internal data structures */
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const bfd_target *encap_real_callback ();
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const bfd_target *
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encap_object_p (abfd)
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bfd *abfd;
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{
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unsigned char magicbuf[4]; /* Raw bytes of magic number from file */
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unsigned long magic; /* Swapped magic number */
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short coff_magic;
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struct external_exec exec_bytes;
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struct internal_exec exec;
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if (bfd_read ((PTR)magicbuf, 1, sizeof (magicbuf), abfd) !=
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sizeof (magicbuf))
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{
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if (bfd_get_error () != bfd_error_system_call)
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bfd_set_error (bfd_error_wrong_format);
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return 0;
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}
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coff_magic = bfd_h_get_16 (abfd, magicbuf);
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if (coff_magic != COFF_MAGIC)
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return 0; /* Not an encap coff file */
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__header_offset_temp==COFF_MAGIC ? sizeof(struct coffheader) : 0)
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(fseek ((f), HEADER_OFFSET((f)), 1))
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magic = bfd_h_get_32 (abfd, magicbuf);
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if (N_BADMAG (*((struct internal_exec *) &magic))) return 0;
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struct external_exec exec_bytes;
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if (bfd_read ((PTR) &exec_bytes, 1, EXEC_BYTES_SIZE, abfd)
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!= EXEC_BYTES_SIZE) {
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if (bfd_get_error () != bfd_error_system_call)
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bfd_set_error (bfd_error_wrong_format);
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return 0;
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}
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NAME(aout,swap_exec_header_in)(abfd, &exec_bytes, &exec);
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return aout_32_some_aout_object_p (abfd, &exec, encap_realcallback);
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}
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/* Finish up the reading of a encapsulated-coff a.out file header */
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const bfd_target *
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encap_real_callback (abfd)
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bfd *abfd;
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{
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struct internal_exec *execp = exec_hdr (abfd);
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MY(callback)(abfd, execp);
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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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{
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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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/* Determine the architecture and machine type of the object file. */
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bfd_default_set_arch_mach(abfd, bfd_arch_m68k, 0); /* FIXME */
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return abfd->xvec;
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}
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/* Write an object file in Encapsulated COFF format.
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Section contents have already been written. We write the
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file header, symbols, and relocation. */
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boolean
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encap_write_object_contents (abfd)
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bfd *abfd;
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{
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bfd_size_type data_pad = 0;
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struct external_exec exec_bytes;
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struct internal_exec *execp = exec_hdr (abfd);
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/****** FIXME: Fragments from the old GNU LD program for dealing with
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encap coff. */
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struct coffheader coffheader;
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int need_coff_header;
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/* Determine whether to count the header as part of
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the text size, and initialize the text size accordingly.
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This depends on the kind of system and on the output format selected. */
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N_SET_MAGIC (outheader, magic);
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#ifdef INITIALIZE_HEADER
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INITIALIZE_HEADER;
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#endif
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text_size = sizeof (struct exec);
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#ifdef COFF_ENCAPSULATE
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if (relocatable_output == 0 && file_table[0].just_syms_flag == 0)
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{
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need_coff_header = 1;
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/* set this flag now, since it will change the values of N_TXTOFF, etc */
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N_SET_FLAGS (outheader, aout_backend_info (abfd)->exec_hdr_flags);
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text_size += sizeof (struct coffheader);
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}
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#endif
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#ifdef COFF_ENCAPSULATE
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if (need_coff_header)
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{
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/* We are encapsulating BSD format within COFF format. */
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struct coffscn *tp, *dp, *bp;
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tp = &coffheader.scns[0];
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dp = &coffheader.scns[1];
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bp = &coffheader.scns[2];
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strcpy (tp->s_name, ".text");
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tp->s_paddr = text_start;
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tp->s_vaddr = text_start;
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tp->s_size = text_size;
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tp->s_scnptr = sizeof (struct coffheader) + sizeof (struct exec);
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tp->s_relptr = 0;
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tp->s_lnnoptr = 0;
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tp->s_nreloc = 0;
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tp->s_nlnno = 0;
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tp->s_flags = 0x20;
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strcpy (dp->s_name, ".data");
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dp->s_paddr = data_start;
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dp->s_vaddr = data_start;
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dp->s_size = data_size;
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dp->s_scnptr = tp->s_scnptr + tp->s_size;
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dp->s_relptr = 0;
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dp->s_lnnoptr = 0;
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dp->s_nreloc = 0;
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dp->s_nlnno = 0;
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dp->s_flags = 0x40;
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strcpy (bp->s_name, ".bss");
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bp->s_paddr = dp->s_vaddr + dp->s_size;
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bp->s_vaddr = bp->s_paddr;
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bp->s_size = bss_size;
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bp->s_scnptr = 0;
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bp->s_relptr = 0;
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bp->s_lnnoptr = 0;
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bp->s_nreloc = 0;
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bp->s_nlnno = 0;
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bp->s_flags = 0x80;
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coffheader.f_magic = COFF_MAGIC;
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coffheader.f_nscns = 3;
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/* store an unlikely time so programs can
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* tell that there is a bsd header
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*/
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coffheader.f_timdat = 1;
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coffheader.f_symptr = 0;
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coffheader.f_nsyms = 0;
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coffheader.f_opthdr = 28;
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coffheader.f_flags = 0x103;
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/* aouthdr */
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coffheader.magic = ZMAGIC;
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coffheader.vstamp = 0;
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coffheader.tsize = tp->s_size;
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coffheader.dsize = dp->s_size;
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coffheader.bsize = bp->s_size;
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coffheader.entry = outheader.a_entry;
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coffheader.text_start = tp->s_vaddr;
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coffheader.data_start = dp->s_vaddr;
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}
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#endif
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#ifdef COFF_ENCAPSULATE
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if (need_coff_header)
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mywrite (&coffheader, sizeof coffheader, 1, outdesc);
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#endif
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#ifndef COFF_ENCAPSULATE
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padfile (N_TXTOFF (outheader) - sizeof outheader, outdesc);
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#endif
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text_size -= N_TXTOFF (outheader);
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WRITE_HEADERS(abfd, execp);
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return true;
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}
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#define MY_write_object_content encap_write_object_contents
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#define MY_object_p encap_object_p
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#define MY_exec_hdr_flags N_FLAGS_COFF_ENCAPSULATE
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#include "aout-target.h"
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