diff options
Diffstat (limited to 'bfd/aout-encap.c')
| -rw-r--r-- | bfd/aout-encap.c | 236 |
1 files changed, 236 insertions, 0 deletions
diff --git a/bfd/aout-encap.c b/bfd/aout-encap.c new file mode 100644 index 0000000..c25f9037 --- /dev/null +++ b/bfd/aout-encap.c @@ -0,0 +1,236 @@ +/* BFD back-end for a.out files encapsulated with COFF headers. + Copyright (C) 1990, 1991 Free Software Foundation, Inc. + +This file is part of BFD, the Binary File Descriptor library. + +This program is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2 of the License, or +(at your option) any later version. + +This program is distributed in the hope that it will be useful, +but WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +GNU General Public License for more details. + +You should have received a copy of the GNU General Public License +along with this program; if not, write to the Free Software +Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ + +/* THIS MODULE IS NOT FINISHED. IT PROBABLY DOESN'T EVEN COMPILE. */ + +#if 0 +#define TARGET_PAGE_SIZE 4096 +#define SEGMENT_SIZE TARGET_PAGE_SIZE +#define TEXT_START_ADDR 0 +#define BYTES_IN_WORD 4 +#endif + +#include "bfd.h" +#include <sysdep.h> +#include "libbfd.h" +#include <aout/aout64.h> +#include "aout/stab_gnu.h" +#include "aout/ar.h" +#include "libaout.h" /* BFD a.out internal data structures */ + +const bfd_target *encap_real_callback (); + +const bfd_target * +encap_object_p (abfd) + bfd *abfd; +{ + unsigned char magicbuf[4]; /* Raw bytes of magic number from file */ + unsigned long magic; /* Swapped magic number */ + short coff_magic; + struct external_exec exec_bytes; + struct internal_exec exec; + + if (bfd_read ((PTR)magicbuf, 1, sizeof (magicbuf), abfd) != + sizeof (magicbuf)) + { + if (bfd_get_error () != bfd_error_system_call) + bfd_set_error (bfd_error_wrong_format); + return 0; + } + + coff_magic = bfd_h_get_16 (abfd, magicbuf); + if (coff_magic != COFF_MAGIC) + return 0; /* Not an encap coff file */ + + __header_offset_temp==COFF_MAGIC ? sizeof(struct coffheader) : 0) + (fseek ((f), HEADER_OFFSET((f)), 1)) + + magic = bfd_h_get_32 (abfd, magicbuf); + + if (N_BADMAG (*((struct internal_exec *) &magic))) return 0; + + struct external_exec exec_bytes; + if (bfd_read ((PTR) &exec_bytes, 1, EXEC_BYTES_SIZE, abfd) + != EXEC_BYTES_SIZE) { + if (bfd_get_error () != bfd_error_system_call) + bfd_set_error (bfd_error_wrong_format); + return 0; + } + NAME(aout,swap_exec_header_in)(abfd, &exec_bytes, &exec); + + return aout_32_some_aout_object_p (abfd, &exec, encap_realcallback); +} + +/* Finish up the reading of a encapsulated-coff a.out file header */ +const bfd_target * +encap_real_callback (abfd) + bfd *abfd; +{ + struct internal_exec *execp = exec_hdr (abfd); + + MY(callback)(abfd, execp); + + /* If we have a coff header, it can give us better values for + text_start and exec_data_start. This is particularly useful + for remote debugging of embedded systems. */ + if (N_FLAGS(exec_aouthdr) & N_FLAGS_COFF_ENCAPSULATE) + { + struct coffheader ch; + int val; + val = lseek (execchan, -(sizeof (AOUTHDR) + sizeof (ch)), 1); + if (val == -1) + perror_with_name (filename); + val = myread (execchan, &ch, sizeof (ch)); + if (val < 0) + perror_with_name (filename); + text_start = ch.text_start; + exec_data_start = ch.data_start; + } else + { + text_start = + IS_OBJECT_FILE (exec_aouthdr) ? 0 : N_TXTADDR (exec_aouthdr); + exec_data_start = IS_OBJECT_FILE (exec_aouthdr) + ? exec_aouthdr.a_text : N_DATADDR (exec_aouthdr); + } + + /* Determine the architecture and machine type of the object file. */ + bfd_default_set_arch_mach(abfd, bfd_arch_m68k, 0); /* FIXME */ + + return abfd->xvec; +} + +/* Write an object file in Encapsulated COFF format. + Section contents have already been written. We write the + file header, symbols, and relocation. */ + +boolean +encap_write_object_contents (abfd) + bfd *abfd; +{ + bfd_size_type data_pad = 0; + struct external_exec exec_bytes; + struct internal_exec *execp = exec_hdr (abfd); + +/****** FIXME: Fragments from the old GNU LD program for dealing with + encap coff. */ +struct coffheader coffheader; +int need_coff_header; + + /* Determine whether to count the header as part of + the text size, and initialize the text size accordingly. + This depends on the kind of system and on the output format selected. */ + + N_SET_MAGIC (outheader, magic); +#ifdef INITIALIZE_HEADER + INITIALIZE_HEADER; +#endif + + text_size = sizeof (struct exec); +#ifdef COFF_ENCAPSULATE + if (relocatable_output == 0 && file_table[0].just_syms_flag == 0) + { + need_coff_header = 1; + /* set this flag now, since it will change the values of N_TXTOFF, etc */ + N_SET_FLAGS (outheader, aout_backend_info (abfd)->exec_hdr_flags); + text_size += sizeof (struct coffheader); + } +#endif + +#ifdef COFF_ENCAPSULATE + if (need_coff_header) + { + /* We are encapsulating BSD format within COFF format. */ + struct coffscn *tp, *dp, *bp; + + tp = &coffheader.scns[0]; + dp = &coffheader.scns[1]; + bp = &coffheader.scns[2]; + + strcpy (tp->s_name, ".text"); + tp->s_paddr = text_start; + tp->s_vaddr = text_start; + tp->s_size = text_size; + tp->s_scnptr = sizeof (struct coffheader) + sizeof (struct exec); + tp->s_relptr = 0; + tp->s_lnnoptr = 0; + tp->s_nreloc = 0; + tp->s_nlnno = 0; + tp->s_flags = 0x20; + strcpy (dp->s_name, ".data"); + dp->s_paddr = data_start; + dp->s_vaddr = data_start; + dp->s_size = data_size; + dp->s_scnptr = tp->s_scnptr + tp->s_size; + dp->s_relptr = 0; + dp->s_lnnoptr = 0; + dp->s_nreloc = 0; + dp->s_nlnno = 0; + dp->s_flags = 0x40; + strcpy (bp->s_name, ".bss"); + bp->s_paddr = dp->s_vaddr + dp->s_size; + bp->s_vaddr = bp->s_paddr; + bp->s_size = bss_size; + bp->s_scnptr = 0; + bp->s_relptr = 0; + bp->s_lnnoptr = 0; + bp->s_nreloc = 0; + bp->s_nlnno = 0; + bp->s_flags = 0x80; + + coffheader.f_magic = COFF_MAGIC; + coffheader.f_nscns = 3; + /* store an unlikely time so programs can + * tell that there is a bsd header + */ + coffheader.f_timdat = 1; + coffheader.f_symptr = 0; + coffheader.f_nsyms = 0; + coffheader.f_opthdr = 28; + coffheader.f_flags = 0x103; + /* aouthdr */ + coffheader.magic = ZMAGIC; + coffheader.vstamp = 0; + coffheader.tsize = tp->s_size; + coffheader.dsize = dp->s_size; + coffheader.bsize = bp->s_size; + coffheader.entry = outheader.a_entry; + coffheader.text_start = tp->s_vaddr; + coffheader.data_start = dp->s_vaddr; + } +#endif + +#ifdef COFF_ENCAPSULATE + if (need_coff_header) + mywrite (&coffheader, sizeof coffheader, 1, outdesc); +#endif + +#ifndef COFF_ENCAPSULATE + padfile (N_TXTOFF (outheader) - sizeof outheader, outdesc); +#endif + + text_size -= N_TXTOFF (outheader); + WRITE_HEADERS(abfd, execp); + return true; +} + +#define MY_write_object_content encap_write_object_contents +#define MY_object_p encap_object_p +#define MY_exec_hdr_flags N_FLAGS_COFF_ENCAPSULATE + +#include "aout-target.h" |