mirror of
https://sourceware.org/git/binutils-gdb.git
synced 2024-12-03 04:12:10 +08:00
416 lines
12 KiB
C
416 lines
12 KiB
C
/* BFD back-end for Intel 386 COFF files (DJGPP variant with a stub).
|
|
Copyright 1997, 1998, 1999, 2000, 2001, 2002, 2006, 2007
|
|
Free Software Foundation, Inc.
|
|
Written by Robert Hoehne.
|
|
|
|
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 3 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., 51 Franklin Street - Fifth Floor, Boston,
|
|
MA 02110-1301, USA. */
|
|
|
|
/* This file handles now also stubbed coff images. The stub is a small
|
|
DOS executable program before the coff image to load it in memory
|
|
and execute it. This is needed, because DOS cannot run coff files.
|
|
|
|
All the functions below are called by the corresponding functions
|
|
from coffswap.h.
|
|
The only thing what they do is to adjust the information stored in
|
|
the COFF file which are offset into the file.
|
|
This is needed, because DJGPP uses a very special way to load and run
|
|
the coff image. It loads the image in memory and assumes then, that the
|
|
image had no stub by using the filepointers as pointers in the coff
|
|
image and NOT in the file.
|
|
|
|
To be compatible with any existing executables I have fixed this
|
|
here and NOT in the DJGPP startup code. */
|
|
|
|
#define TARGET_SYM go32stubbedcoff_vec
|
|
#define TARGET_NAME "coff-go32-exe"
|
|
#define TARGET_UNDERSCORE '_'
|
|
#define COFF_GO32_EXE
|
|
#define COFF_LONG_SECTION_NAMES
|
|
#define COFF_SUPPORT_GNU_LINKONCE
|
|
#define COFF_LONG_FILENAMES
|
|
|
|
#define COFF_SECTION_ALIGNMENT_ENTRIES \
|
|
{ COFF_SECTION_NAME_EXACT_MATCH (".data"), \
|
|
COFF_ALIGNMENT_FIELD_EMPTY, COFF_ALIGNMENT_FIELD_EMPTY, 4 }, \
|
|
{ COFF_SECTION_NAME_EXACT_MATCH (".text"), \
|
|
COFF_ALIGNMENT_FIELD_EMPTY, COFF_ALIGNMENT_FIELD_EMPTY, 4 }, \
|
|
{ COFF_SECTION_NAME_PARTIAL_MATCH (".debug"), \
|
|
COFF_ALIGNMENT_FIELD_EMPTY, COFF_ALIGNMENT_FIELD_EMPTY, 0 }, \
|
|
{ COFF_SECTION_NAME_PARTIAL_MATCH (".gnu.linkonce.wi"), \
|
|
COFF_ALIGNMENT_FIELD_EMPTY, COFF_ALIGNMENT_FIELD_EMPTY, 0 }
|
|
|
|
#include "bfd.h"
|
|
|
|
/* At first the prototypes. */
|
|
|
|
static void
|
|
adjust_filehdr_in_post PARAMS ((bfd *, PTR, PTR));
|
|
static void
|
|
adjust_filehdr_out_pre PARAMS ((bfd *, PTR, PTR));
|
|
static void
|
|
adjust_filehdr_out_post PARAMS ((bfd *, PTR, PTR));
|
|
static void
|
|
adjust_scnhdr_in_post PARAMS ((bfd *, PTR, PTR));
|
|
static void
|
|
adjust_scnhdr_out_pre PARAMS ((bfd *, PTR, PTR));
|
|
static void
|
|
adjust_scnhdr_out_post PARAMS ((bfd *, PTR, PTR));
|
|
static void
|
|
adjust_aux_in_post PARAMS ((bfd *, PTR, int, int, int, int, PTR));
|
|
static void
|
|
adjust_aux_out_pre PARAMS ((bfd *, PTR, int, int, int, int, PTR));
|
|
static void
|
|
adjust_aux_out_post PARAMS ((bfd *, PTR, int, int, int, int, PTR));
|
|
static void
|
|
create_go32_stub PARAMS ((bfd *));
|
|
|
|
/* All that ..._PRE and ...POST functions are called from the corresponding
|
|
coff_swap... functions. The ...PRE functions are called at the beginning
|
|
of the function and the ...POST functions at the end of the swap routines. */
|
|
|
|
#define COFF_ADJUST_FILEHDR_IN_POST adjust_filehdr_in_post
|
|
#define COFF_ADJUST_FILEHDR_OUT_PRE adjust_filehdr_out_pre
|
|
#define COFF_ADJUST_FILEHDR_OUT_POST adjust_filehdr_out_post
|
|
|
|
#define COFF_ADJUST_SCNHDR_IN_POST adjust_scnhdr_in_post
|
|
#define COFF_ADJUST_SCNHDR_OUT_PRE adjust_scnhdr_out_pre
|
|
#define COFF_ADJUST_SCNHDR_OUT_POST adjust_scnhdr_out_post
|
|
|
|
#define COFF_ADJUST_AUX_IN_POST adjust_aux_in_post
|
|
#define COFF_ADJUST_AUX_OUT_PRE adjust_aux_out_pre
|
|
#define COFF_ADJUST_AUX_OUT_POST adjust_aux_out_post
|
|
|
|
static bfd_boolean
|
|
go32_stubbed_coff_bfd_copy_private_bfd_data PARAMS ((bfd *, bfd *));
|
|
|
|
#define coff_bfd_copy_private_bfd_data go32_stubbed_coff_bfd_copy_private_bfd_data
|
|
|
|
#include "coff-i386.c"
|
|
|
|
/* I hold in the usrdata the stub. */
|
|
#define bfd_coff_go32stub bfd_usrdata
|
|
|
|
/* This macro is used, because I cannot assume the endianess of the
|
|
host system. */
|
|
#define _H(index) (H_GET_16 (abfd, (header+index*2)))
|
|
|
|
/* These bytes are a 2048-byte DOS executable, which loads the COFF
|
|
image into memory and then runs it. It is called 'stub'. */
|
|
|
|
static const unsigned char stub_bytes[STUBSIZE] =
|
|
{
|
|
#include "go32stub.h"
|
|
};
|
|
|
|
/*
|
|
I have not commented each swap function below, because the
|
|
technique is in any function the same. For the ...in function,
|
|
all the pointers are adjusted by adding STUBSIZE and for the
|
|
...out function, it is subtracted first and after calling the
|
|
standard swap function it is reset to the old value. */
|
|
|
|
/* This macro is used for adjusting the filepointers, which
|
|
is done only, if the pointer is nonzero. */
|
|
|
|
#define ADJUST_VAL(val,diff) \
|
|
if (val != 0) val += diff
|
|
|
|
static void
|
|
adjust_filehdr_in_post (abfd, src, dst)
|
|
bfd *abfd;
|
|
PTR src;
|
|
PTR dst;
|
|
{
|
|
FILHDR *filehdr_src = (FILHDR *) src;
|
|
struct internal_filehdr *filehdr_dst = (struct internal_filehdr *) dst;
|
|
|
|
ADJUST_VAL (filehdr_dst->f_symptr, STUBSIZE);
|
|
|
|
/* Save now the stub to be used later. */
|
|
bfd_coff_go32stub (abfd) = (PTR) bfd_alloc (abfd, (bfd_size_type) STUBSIZE);
|
|
|
|
/* Since this function returns no status, I do not set here
|
|
any bfd_error_...
|
|
That means, before the use of bfd_coff_go32stub (), this value
|
|
should be checked if it is != NULL. */
|
|
if (bfd_coff_go32stub (abfd) == NULL)
|
|
return;
|
|
memcpy (bfd_coff_go32stub (abfd), filehdr_src->stub, STUBSIZE);
|
|
}
|
|
|
|
static void
|
|
adjust_filehdr_out_pre (abfd, in, out)
|
|
bfd *abfd;
|
|
PTR in;
|
|
PTR out;
|
|
{
|
|
struct internal_filehdr *filehdr_in = (struct internal_filehdr *) in;
|
|
FILHDR *filehdr_out = (FILHDR *) out;
|
|
|
|
/* Generate the stub. */
|
|
create_go32_stub (abfd);
|
|
|
|
/* Copy the stub to the file header. */
|
|
if (bfd_coff_go32stub (abfd) != NULL)
|
|
memcpy (filehdr_out->stub, bfd_coff_go32stub (abfd), STUBSIZE);
|
|
else
|
|
/* Use the default. */
|
|
memcpy (filehdr_out->stub, stub_bytes, STUBSIZE);
|
|
|
|
ADJUST_VAL (filehdr_in->f_symptr, -STUBSIZE);
|
|
}
|
|
|
|
static void
|
|
adjust_filehdr_out_post (abfd, in, out)
|
|
bfd *abfd ATTRIBUTE_UNUSED;
|
|
PTR in;
|
|
PTR out ATTRIBUTE_UNUSED;
|
|
{
|
|
struct internal_filehdr *filehdr_in = (struct internal_filehdr *) in;
|
|
/* Undo the above change. */
|
|
ADJUST_VAL (filehdr_in->f_symptr, STUBSIZE);
|
|
}
|
|
|
|
static void
|
|
adjust_scnhdr_in_post (abfd, ext, in)
|
|
bfd *abfd ATTRIBUTE_UNUSED;
|
|
PTR ext ATTRIBUTE_UNUSED;
|
|
PTR in;
|
|
{
|
|
struct internal_scnhdr *scnhdr_int = (struct internal_scnhdr *) in;
|
|
|
|
ADJUST_VAL (scnhdr_int->s_scnptr, STUBSIZE);
|
|
ADJUST_VAL (scnhdr_int->s_relptr, STUBSIZE);
|
|
ADJUST_VAL (scnhdr_int->s_lnnoptr, STUBSIZE);
|
|
}
|
|
|
|
static void
|
|
adjust_scnhdr_out_pre (abfd, in, out)
|
|
bfd *abfd ATTRIBUTE_UNUSED;
|
|
PTR in;
|
|
PTR out ATTRIBUTE_UNUSED;
|
|
{
|
|
struct internal_scnhdr *scnhdr_int = (struct internal_scnhdr *) in;
|
|
|
|
ADJUST_VAL (scnhdr_int->s_scnptr, -STUBSIZE);
|
|
ADJUST_VAL (scnhdr_int->s_relptr, -STUBSIZE);
|
|
ADJUST_VAL (scnhdr_int->s_lnnoptr, -STUBSIZE);
|
|
}
|
|
|
|
static void
|
|
adjust_scnhdr_out_post (abfd, in, out)
|
|
bfd *abfd ATTRIBUTE_UNUSED;
|
|
PTR in;
|
|
PTR out ATTRIBUTE_UNUSED;
|
|
{
|
|
struct internal_scnhdr *scnhdr_int = (struct internal_scnhdr *) in;
|
|
|
|
ADJUST_VAL (scnhdr_int->s_scnptr, STUBSIZE);
|
|
ADJUST_VAL (scnhdr_int->s_relptr, STUBSIZE);
|
|
ADJUST_VAL (scnhdr_int->s_lnnoptr, STUBSIZE);
|
|
}
|
|
|
|
static void
|
|
adjust_aux_in_post (abfd, ext1, type, class, indx, numaux, in1)
|
|
bfd *abfd ATTRIBUTE_UNUSED;
|
|
PTR ext1 ATTRIBUTE_UNUSED;
|
|
int type;
|
|
int class;
|
|
int indx ATTRIBUTE_UNUSED;
|
|
int numaux ATTRIBUTE_UNUSED;
|
|
PTR in1;
|
|
{
|
|
union internal_auxent *in = (union internal_auxent *) in1;
|
|
|
|
if (class == C_BLOCK || class == C_FCN || ISFCN (type) || ISTAG (class))
|
|
{
|
|
ADJUST_VAL (in->x_sym.x_fcnary.x_fcn.x_lnnoptr, STUBSIZE);
|
|
}
|
|
}
|
|
|
|
static void
|
|
adjust_aux_out_pre (abfd, inp, type, class, indx, numaux, extp)
|
|
bfd *abfd ATTRIBUTE_UNUSED;
|
|
PTR inp;
|
|
int type;
|
|
int class;
|
|
int indx ATTRIBUTE_UNUSED;
|
|
int numaux ATTRIBUTE_UNUSED;
|
|
PTR extp ATTRIBUTE_UNUSED;
|
|
{
|
|
union internal_auxent *in = (union internal_auxent *) inp;
|
|
|
|
if (class == C_BLOCK || class == C_FCN || ISFCN (type) || ISTAG (class))
|
|
{
|
|
ADJUST_VAL (in->x_sym.x_fcnary.x_fcn.x_lnnoptr, -STUBSIZE);
|
|
}
|
|
}
|
|
|
|
static void
|
|
adjust_aux_out_post (abfd, inp, type, class, indx, numaux, extp)
|
|
bfd *abfd ATTRIBUTE_UNUSED;
|
|
PTR inp;
|
|
int type;
|
|
int class;
|
|
int indx ATTRIBUTE_UNUSED;
|
|
int numaux ATTRIBUTE_UNUSED;
|
|
PTR extp ATTRIBUTE_UNUSED;
|
|
{
|
|
union internal_auxent *in = (union internal_auxent *) inp;
|
|
|
|
if (class == C_BLOCK || class == C_FCN || ISFCN (type) || ISTAG (class))
|
|
{
|
|
ADJUST_VAL (in->x_sym.x_fcnary.x_fcn.x_lnnoptr, STUBSIZE);
|
|
}
|
|
}
|
|
|
|
/* That's the function, which creates the stub. There are
|
|
different cases from where the stub is taken.
|
|
At first the environment variable $(GO32STUB) is checked and then
|
|
$(STUB) if it was not set.
|
|
If it exists and points to a valid stub the stub is taken from
|
|
that file. This file can be also a whole executable file, because
|
|
the stub is computed from the exe information at the start of that
|
|
file.
|
|
|
|
If there was any error, the standard stub (compiled in this file)
|
|
is taken. */
|
|
|
|
static void
|
|
create_go32_stub (abfd)
|
|
bfd *abfd;
|
|
{
|
|
/* Do it only once. */
|
|
if (bfd_coff_go32stub (abfd) == NULL)
|
|
{
|
|
char *stub;
|
|
struct stat st;
|
|
int f;
|
|
unsigned char header[10];
|
|
char magic[8];
|
|
unsigned long coff_start;
|
|
long exe_start;
|
|
|
|
/* Check at first the environment variable $(GO32STUB). */
|
|
stub = getenv ("GO32STUB");
|
|
/* Now check the environment variable $(STUB). */
|
|
if (stub == NULL)
|
|
stub = getenv ("STUB");
|
|
if (stub == NULL)
|
|
goto stub_end;
|
|
if (stat (stub, &st) != 0)
|
|
goto stub_end;
|
|
#ifdef O_BINARY
|
|
f = open (stub, O_RDONLY | O_BINARY);
|
|
#else
|
|
f = open (stub, O_RDONLY);
|
|
#endif
|
|
if (f < 0)
|
|
goto stub_end;
|
|
if (read (f, &header, sizeof (header)) < 0)
|
|
{
|
|
close (f);
|
|
goto stub_end;
|
|
}
|
|
if (_H (0) != 0x5a4d) /* It is not an exe file. */
|
|
{
|
|
close (f);
|
|
goto stub_end;
|
|
}
|
|
/* Compute the size of the stub (it is every thing up
|
|
to the beginning of the coff image). */
|
|
coff_start = (long) _H (2) * 512L;
|
|
if (_H (1))
|
|
coff_start += (long) _H (1) - 512L;
|
|
|
|
/* Currently there is only a fixed stub size of 2048 bytes
|
|
supported. */
|
|
if (coff_start != 2048)
|
|
{
|
|
close (f);
|
|
goto stub_end;
|
|
}
|
|
exe_start = _H (4) * 16;
|
|
if ((long) lseek (f, exe_start, SEEK_SET) != exe_start)
|
|
{
|
|
close (f);
|
|
goto stub_end;
|
|
}
|
|
if (read (f, &magic, 8) != 8)
|
|
{
|
|
close (f);
|
|
goto stub_end;
|
|
}
|
|
if (! CONST_STRNEQ (magic, "go32stub"))
|
|
{
|
|
close (f);
|
|
goto stub_end;
|
|
}
|
|
/* Now we found a correct stub (hopefully). */
|
|
bfd_coff_go32stub (abfd)
|
|
= (PTR) bfd_alloc (abfd, (bfd_size_type) coff_start);
|
|
if (bfd_coff_go32stub (abfd) == NULL)
|
|
{
|
|
close (f);
|
|
return;
|
|
}
|
|
lseek (f, 0L, SEEK_SET);
|
|
if ((unsigned long) read (f, bfd_coff_go32stub (abfd), coff_start)
|
|
!= coff_start)
|
|
{
|
|
bfd_release (abfd, bfd_coff_go32stub (abfd));
|
|
bfd_coff_go32stub (abfd) = NULL;
|
|
}
|
|
close (f);
|
|
}
|
|
stub_end:
|
|
/* There was something wrong above, so use now the standard builtin
|
|
stub. */
|
|
if (bfd_coff_go32stub (abfd) == NULL)
|
|
{
|
|
bfd_coff_go32stub (abfd)
|
|
= (PTR) bfd_alloc (abfd, (bfd_size_type) STUBSIZE);
|
|
if (bfd_coff_go32stub (abfd) == NULL)
|
|
return;
|
|
memcpy (bfd_coff_go32stub (abfd), stub_bytes, STUBSIZE);
|
|
}
|
|
}
|
|
|
|
/* If ibfd was a stubbed coff image, copy the stub from that bfd
|
|
to the new obfd. */
|
|
|
|
static bfd_boolean
|
|
go32_stubbed_coff_bfd_copy_private_bfd_data (ibfd, obfd)
|
|
bfd *ibfd;
|
|
bfd *obfd;
|
|
{
|
|
/* Check if both are the same targets. */
|
|
if (ibfd->xvec != obfd->xvec)
|
|
return TRUE;
|
|
|
|
/* Check if both have a valid stub. */
|
|
if (bfd_coff_go32stub (ibfd) == NULL
|
|
|| bfd_coff_go32stub (obfd) == NULL)
|
|
return TRUE;
|
|
|
|
/* Now copy the stub. */
|
|
memcpy (bfd_coff_go32stub (obfd), bfd_coff_go32stub (ibfd), STUBSIZE);
|
|
|
|
return TRUE;
|
|
}
|