426 lines
12 KiB
C
426 lines
12 KiB
C
/* BFD back-end for Intel 386 COFF files (DJGPP variant with a stub).
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Copyright 1997, 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
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Written by Robert Hoehne.
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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 file handles now also stubbed coff images. The stub is a small
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DOS executable program before the coff image to load it in memory
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and execute it. This is needed, because DOS cannot run coff files.
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All the functions below are called by the corresponding functions
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from coffswap.h.
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The only thing what they do is to adjust the information stored in
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the COFF file which are offset into the file.
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This is needed, because DJGPP uses a very special way to load and run
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the coff image. It loads the image in memory and assumes then, that the
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image had no stub by using the filepointers as pointers in the coff
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image and NOT in the file.
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To be compatible with any existing executables I have fixed this
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here and NOT in the DJGPP startup code.
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*/
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#define TARGET_SYM go32stubbedcoff_vec
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#define TARGET_NAME "coff-go32-exe"
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#define TARGET_UNDERSCORE '_'
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#define COFF_GO32_EXE
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#define COFF_LONG_SECTION_NAMES
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#define COFF_SUPPORT_GNU_LINKONCE
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#define COFF_LONG_FILENAMES
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#define COFF_SECTION_ALIGNMENT_ENTRIES \
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{ COFF_SECTION_NAME_EXACT_MATCH (".data"), \
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COFF_ALIGNMENT_FIELD_EMPTY, COFF_ALIGNMENT_FIELD_EMPTY, 4 }, \
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{ COFF_SECTION_NAME_EXACT_MATCH (".text"), \
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COFF_ALIGNMENT_FIELD_EMPTY, COFF_ALIGNMENT_FIELD_EMPTY, 4 }, \
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{ COFF_SECTION_NAME_PARTIAL_MATCH (".debug"), \
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COFF_ALIGNMENT_FIELD_EMPTY, COFF_ALIGNMENT_FIELD_EMPTY, 0 }, \
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{ COFF_SECTION_NAME_PARTIAL_MATCH (".gnu.linkonce.wi"), \
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COFF_ALIGNMENT_FIELD_EMPTY, COFF_ALIGNMENT_FIELD_EMPTY, 0 }
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#include "bfd.h"
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/* At first the prototypes */
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static void
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adjust_filehdr_in_post PARAMS ((bfd * abfd, PTR src, PTR dst));
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static void
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adjust_filehdr_out_pre PARAMS ((bfd * abfd, PTR in, PTR out));
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static void
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adjust_filehdr_out_post PARAMS ((bfd * abfd, PTR in, PTR out));
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static void
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adjust_scnhdr_in_post PARAMS ((bfd * abfd, PTR ext, PTR in));
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static void
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adjust_scnhdr_out_pre PARAMS ((bfd * abfd, PTR in, PTR out));
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static void
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adjust_scnhdr_out_post PARAMS ((bfd * abfd, PTR in, PTR out));
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static void
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adjust_aux_in_post PARAMS ((bfd * abfd, PTR ext1, int type, int class, int indx,
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int numaux, PTR in1));
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static void
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adjust_aux_out_pre PARAMS ((bfd * abfd, PTR inp, int type, int class, int indx,
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int numaux, PTR extp));
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static void
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adjust_aux_out_post PARAMS ((bfd * abfd, PTR inp, int type, int class, int indx,
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int numaux, PTR extp));
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static void
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create_go32_stub PARAMS ((bfd * abfd));
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/*
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All that ..._PRE and ...POST functions are called from the corresponding
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coff_swap... functions. The ...PRE functions are called at the beginning
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of the function and the ...POST functions at the end of the swap routines.
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*/
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#define COFF_ADJUST_FILEHDR_IN_POST adjust_filehdr_in_post
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#define COFF_ADJUST_FILEHDR_OUT_PRE adjust_filehdr_out_pre
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#define COFF_ADJUST_FILEHDR_OUT_POST adjust_filehdr_out_post
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#define COFF_ADJUST_SCNHDR_IN_POST adjust_scnhdr_in_post
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#define COFF_ADJUST_SCNHDR_OUT_PRE adjust_scnhdr_out_pre
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#define COFF_ADJUST_SCNHDR_OUT_POST adjust_scnhdr_out_post
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#define COFF_ADJUST_AUX_IN_POST adjust_aux_in_post
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#define COFF_ADJUST_AUX_OUT_PRE adjust_aux_out_pre
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#define COFF_ADJUST_AUX_OUT_POST adjust_aux_out_post
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static boolean
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go32_stubbed_coff_bfd_copy_private_bfd_data PARAMS ((bfd * ibfd, bfd * obfd));
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#define coff_bfd_copy_private_bfd_data go32_stubbed_coff_bfd_copy_private_bfd_data
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#include "coff-i386.c"
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/* I hold in the usrdata the stub */
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#define bfd_coff_go32stub bfd_usrdata
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/* This macro is used, because I cannot assume the endianess of the
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host system */
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#define _H(index) (bfd_h_get_16(abfd, (bfd_byte *) (header+index*2)))
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/* These bytes are a 2048-byte DOS executable, which loads the COFF
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image into memory and then runs it. It is called 'stub' */
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static unsigned char stub_bytes[STUBSIZE] =
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{
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#include "go32stub.h"
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};
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/*
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I have not commented each swap function below, because the
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technique is in any function the same. For the ...in function,
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all the pointers are adjusted by adding STUBSIZE and for the
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...out function, it is subtracted first and after calling the
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standard swap function it is reset to the old value */
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/* This macro is used for adjusting the filepointers, which
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is done only, if the pointer is nonzero */
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#define ADJUST_VAL(val,diff) \
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if (val != 0) val += diff
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static void
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adjust_filehdr_in_post (abfd, src, dst)
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bfd *abfd;
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PTR src;
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PTR dst;
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{
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FILHDR *filehdr_src = (FILHDR *) src;
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struct internal_filehdr *filehdr_dst = (struct internal_filehdr *) dst;
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ADJUST_VAL (filehdr_dst->f_symptr, STUBSIZE);
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/* Save now the stub to be used later */
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bfd_coff_go32stub (abfd) = (PTR) bfd_alloc (abfd, STUBSIZE);
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/* Since this function returns no status, I do not set here
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any bfd_error_...
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That means, before the use of bfd_coff_go32stub (), this value
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should be checked if it is != NULL */
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if (bfd_coff_go32stub (abfd) == NULL)
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return;
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memcpy (bfd_coff_go32stub (abfd), filehdr_src->stub, STUBSIZE);
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}
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static void
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adjust_filehdr_out_pre (abfd, in, out)
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bfd *abfd;
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PTR in;
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PTR out;
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{
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struct internal_filehdr *filehdr_in = (struct internal_filehdr *) in;
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FILHDR *filehdr_out = (FILHDR *) out;
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/* Generate the stub */
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create_go32_stub (abfd);
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/* Copy the stub to the file header */
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if (bfd_coff_go32stub (abfd) != NULL)
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memcpy (filehdr_out->stub, bfd_coff_go32stub (abfd), STUBSIZE);
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else
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/* use the default */
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memcpy (filehdr_out->stub, stub_bytes, STUBSIZE);
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ADJUST_VAL (filehdr_in->f_symptr, -STUBSIZE);
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}
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static void
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adjust_filehdr_out_post (abfd, in, out)
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bfd *abfd ATTRIBUTE_UNUSED;
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PTR in;
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PTR out ATTRIBUTE_UNUSED;
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{
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struct internal_filehdr *filehdr_in = (struct internal_filehdr *) in;
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/* undo the above change */
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ADJUST_VAL (filehdr_in->f_symptr, STUBSIZE);
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}
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static void
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adjust_scnhdr_in_post (abfd, ext, in)
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bfd *abfd ATTRIBUTE_UNUSED;
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PTR ext ATTRIBUTE_UNUSED;
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PTR in;
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{
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struct internal_scnhdr *scnhdr_int = (struct internal_scnhdr *) in;
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ADJUST_VAL (scnhdr_int->s_scnptr, STUBSIZE);
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ADJUST_VAL (scnhdr_int->s_relptr, STUBSIZE);
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ADJUST_VAL (scnhdr_int->s_lnnoptr, STUBSIZE);
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}
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static void
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adjust_scnhdr_out_pre (abfd, in, out)
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bfd *abfd ATTRIBUTE_UNUSED;
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PTR in;
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PTR out ATTRIBUTE_UNUSED;
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{
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struct internal_scnhdr *scnhdr_int = (struct internal_scnhdr *) in;
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ADJUST_VAL (scnhdr_int->s_scnptr, -STUBSIZE);
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ADJUST_VAL (scnhdr_int->s_relptr, -STUBSIZE);
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ADJUST_VAL (scnhdr_int->s_lnnoptr, -STUBSIZE);
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}
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static void
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adjust_scnhdr_out_post (abfd, in, out)
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bfd *abfd ATTRIBUTE_UNUSED;
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PTR in;
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PTR out ATTRIBUTE_UNUSED;
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{
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struct internal_scnhdr *scnhdr_int = (struct internal_scnhdr *) in;
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ADJUST_VAL (scnhdr_int->s_scnptr, STUBSIZE);
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ADJUST_VAL (scnhdr_int->s_relptr, STUBSIZE);
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ADJUST_VAL (scnhdr_int->s_lnnoptr, STUBSIZE);
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}
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static void
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adjust_aux_in_post (abfd, ext1, type, class, indx, numaux, in1)
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bfd *abfd ATTRIBUTE_UNUSED;
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PTR ext1 ATTRIBUTE_UNUSED;
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int type;
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int class;
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int indx ATTRIBUTE_UNUSED;
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int numaux ATTRIBUTE_UNUSED;
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PTR in1;
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{
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union internal_auxent *in = (union internal_auxent *) in1;
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if (class == C_BLOCK || class == C_FCN || ISFCN (type) || ISTAG (class))
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{
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ADJUST_VAL (in->x_sym.x_fcnary.x_fcn.x_lnnoptr, STUBSIZE);
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}
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}
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static void
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adjust_aux_out_pre (abfd, inp, type, class, indx, numaux, extp)
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bfd *abfd ATTRIBUTE_UNUSED;
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PTR inp;
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int type;
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int class;
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int indx ATTRIBUTE_UNUSED;
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int numaux ATTRIBUTE_UNUSED;
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PTR extp ATTRIBUTE_UNUSED;
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{
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union internal_auxent *in = (union internal_auxent *) inp;
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if (class == C_BLOCK || class == C_FCN || ISFCN (type) || ISTAG (class))
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{
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ADJUST_VAL (in->x_sym.x_fcnary.x_fcn.x_lnnoptr, -STUBSIZE);
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}
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}
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static void
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adjust_aux_out_post (abfd, inp, type, class, indx, numaux, extp)
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bfd *abfd ATTRIBUTE_UNUSED;
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PTR inp;
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int type;
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int class;
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int indx ATTRIBUTE_UNUSED;
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int numaux ATTRIBUTE_UNUSED;
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PTR extp ATTRIBUTE_UNUSED;
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{
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union internal_auxent *in = (union internal_auxent *) inp;
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if (class == C_BLOCK || class == C_FCN || ISFCN (type) || ISTAG (class))
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{
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ADJUST_VAL (in->x_sym.x_fcnary.x_fcn.x_lnnoptr, STUBSIZE);
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}
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}
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/*
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That's the function, which creates the stub. There are
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different cases from where the stub is taken.
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At first the environment variable $(GO32STUB) is checked and then
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$(STUB) if it was not set.
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If it exists and points to a valid stub the stub is taken from
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that file. This file can be also a whole executable file, because
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the stub is computed from the exe information at the start of that
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file.
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If there was any error, the standard stub (compiled in this file)
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is taken.
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*/
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static void
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create_go32_stub (abfd)
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bfd *abfd;
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{
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/* Do it only once */
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if (bfd_coff_go32stub (abfd) == NULL)
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{
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char *stub;
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struct stat st;
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int f;
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unsigned char header[10];
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char magic[8];
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unsigned long coff_start, exe_start;
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/* Check at first the environment variable $(GO32STUB) */
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stub = getenv ("GO32STUB");
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/* Now check the environment variable $(STUB) */
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if (stub == NULL)
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stub = getenv ("STUB");
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if (stub == NULL)
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goto stub_end;
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if (stat (stub, &st) != 0)
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goto stub_end;
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#ifdef O_BINARY
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f = open (stub, O_RDONLY | O_BINARY);
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#else
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f = open (stub, O_RDONLY);
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#endif
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if (f < 0)
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goto stub_end;
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if (read (f, &header, sizeof (header)) < 0)
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{
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close (f);
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goto stub_end;
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}
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if (_H (0) != 0x5a4d) /* it is not an exe file */
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{
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close (f);
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goto stub_end;
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}
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/* Compute the size of the stub (it is every thing up
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to the beginning of the coff image) */
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coff_start = (long) _H (2) * 512L;
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if (_H (1))
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coff_start += (long) _H (1) - 512L;
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/* Currently there is only a fixed stub size of 2048 bytes
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supported */
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if (coff_start != 2048)
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{
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close (f);
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goto stub_end;
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}
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exe_start = _H (4) * 16;
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if ((unsigned long) lseek (f, exe_start, SEEK_SET) != exe_start)
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{
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close (f);
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goto stub_end;
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}
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if (read (f, &magic, 8) != 8)
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{
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close (f);
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goto stub_end;
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}
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if (memcmp (magic, "go32stub", 8) != 0)
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{
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close (f);
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goto stub_end;
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}
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/* Now we found a correct stub (hopefully) */
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bfd_coff_go32stub (abfd) = (PTR) bfd_alloc (abfd, coff_start);
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if (bfd_coff_go32stub (abfd) == NULL)
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{
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close (f);
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return;
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}
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lseek (f, 0L, SEEK_SET);
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if ((unsigned long) read (f, bfd_coff_go32stub (abfd), coff_start)
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!= coff_start)
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{
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bfd_release (abfd, bfd_coff_go32stub (abfd));
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bfd_coff_go32stub (abfd) = NULL;
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}
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close (f);
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}
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stub_end:
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/* There was something wrong above, so use now the standard builtin
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stub */
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if (bfd_coff_go32stub (abfd) == NULL)
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{
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bfd_coff_go32stub (abfd) = (PTR) bfd_alloc (abfd, STUBSIZE);
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if (bfd_coff_go32stub (abfd) == NULL)
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{
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return;
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}
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memcpy (bfd_coff_go32stub (abfd), stub_bytes, STUBSIZE);
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}
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}
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/* If ibfd was a stubbed coff image, copy the stub from that bfd
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to the new obfd.
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*/
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static boolean
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go32_stubbed_coff_bfd_copy_private_bfd_data (ibfd, obfd)
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bfd *ibfd;
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bfd *obfd;
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{
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/* check if both are the same targets */
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if (ibfd->xvec != obfd->xvec)
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return true;
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/* check if both have a valid stub */
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if (bfd_coff_go32stub (ibfd) == NULL
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|| bfd_coff_go32stub (obfd) == NULL)
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return true;
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/* Now copy the stub */
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memcpy (bfd_coff_go32stub (obfd), bfd_coff_go32stub (ibfd), STUBSIZE);
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return true;
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}
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