[deliverable/binutils-gdb.git] / bfd / coff-stgo32.c

/* BFD back-end for Intel 386 COFF files (go32 variant with a stub).
   Copyright 1997, 1998, 1999 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 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 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

#include "bfd.h"

/* At first the prototypes */

static void
adjust_filehdr_in_post PARAMS ((bfd * abfd, PTR src, PTR dst));
static void
adjust_filehdr_out_pre PARAMS ((bfd * abfd, PTR in, PTR out));
static void
adjust_filehdr_out_post PARAMS ((bfd * abfd, PTR in, PTR out));

static void
adjust_scnhdr_in_post PARAMS ((bfd * abfd, PTR ext, PTR in));
static void
adjust_scnhdr_out_pre PARAMS ((bfd * abfd, PTR in, PTR out));
static void
adjust_scnhdr_out_post PARAMS ((bfd * abfd, PTR in, PTR out));

static void
adjust_aux_in_post PARAMS ((bfd * abfd, PTR ext1, int type, int class, int indx,
			    int numaux, PTR in1));
static void
adjust_aux_out_pre PARAMS ((bfd * abfd, PTR inp, int type, int class, int indx,
			    int numaux, PTR extp));
static void
adjust_aux_out_post PARAMS ((bfd * abfd, PTR inp, int type, int class, int indx,
			     int numaux, PTR extp));

static void
create_go32_stub PARAMS ((bfd * abfd));

/*
   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 boolean
  go32_stubbed_coff_bfd_copy_private_bfd_data PARAMS ((bfd * ibfd, bfd * obfd));

#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) (bfd_h_get_16(abfd, (bfd_byte *)(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 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, 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, 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 ((unsigned 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 (memcmp (magic, "go32stub", 8) != 0)
	{
	  close (f);
	  goto stub_end;
	}
      /* Now we found a correct stub (hopefully) */
      bfd_coff_go32stub (abfd) = (PTR) bfd_alloc (abfd, 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, 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 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;
}
Commit	Line	Data
252b5132	1	/* BFD back-end for Intel 386 COFF files (go32 variant with a stub).
5f771d47	2	Copyright 1997, 1998, 1999 Free Software Foundation, Inc.
252b5132 RH	3	Written by Robert Hoehne.
	4
	5	This file is part of BFD, the Binary File Descriptor library.
	6
	7	This program is free software; you can redistribute it and/or modify
	8	it under the terms of the GNU General Public License as published by
	9	the Free Software Foundation; either version 2 of the License, or
	10	(at your option) any later version.
	11
	12	This program is distributed in the hope that it will be useful,
	13	but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	GNU General Public License for more details.
	16
	17	You should have received a copy of the GNU General Public License
	18	along with this program; if not, write to the Free Software
	19	Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
	20
	21	/* This file handles now also stubbed coff images. The stub is a small
	22	DOS executable program before the coff image to load it in memory
	23	and execute it. This is needed, because DOS cannot run coff files.
	24
	25	All the functions below are called by the corresponding functions
	26	from coffswap.h.
	27	The only thing what they do is to adjust the information stored in
	28	the COFF file which are offset into the file.
	29	This is needed, because DJGPP uses a very special way to load and run
	30	the coff image. It loads the image in memory and assumes then, that the
	31	image had no stub by using the filepointers as pointers in the coff
	32	image and NOT in the file.
	33
	34	To be compatible with any existing executables I have fixed this
	35	here and NOT in the DJGPP startup code.
	36	*/
	37
	38	#define TARGET_SYM go32stubbedcoff_vec
	39	#define TARGET_NAME "coff-go32-exe"
	40	#define TARGET_UNDERSCORE '_'
	41	#define COFF_GO32_EXE
242eabea ILT	42	#define COFF_LONG_SECTION_NAMES
242eabea ILT	43	#define COFF_SUPPORT_GNU_LINKONCE
252b5132 RH	44
	45	#include "bfd.h"
	46
	47	/* At first the prototypes */
	48
	49	static void
	50	adjust_filehdr_in_post PARAMS ((bfd * abfd, PTR src, PTR dst));
	51	static void
	52	adjust_filehdr_out_pre PARAMS ((bfd * abfd, PTR in, PTR out));
	53	static void
	54	adjust_filehdr_out_post PARAMS ((bfd * abfd, PTR in, PTR out));
	55
	56	static void
	57	adjust_scnhdr_in_post PARAMS ((bfd * abfd, PTR ext, PTR in));
	58	static void
	59	adjust_scnhdr_out_pre PARAMS ((bfd * abfd, PTR in, PTR out));
	60	static void
	61	adjust_scnhdr_out_post PARAMS ((bfd * abfd, PTR in, PTR out));
	62
	63	static void
	64	adjust_aux_in_post PARAMS ((bfd * abfd, PTR ext1, int type, int class, int indx,
	65	int numaux, PTR in1));
	66	static void
	67	adjust_aux_out_pre PARAMS ((bfd * abfd, PTR inp, int type, int class, int indx,
	68	int numaux, PTR extp));
	69	static void
	70	adjust_aux_out_post PARAMS ((bfd * abfd, PTR inp, int type, int class, int indx,
	71	int numaux, PTR extp));
	72
	73	static void
	74	create_go32_stub PARAMS ((bfd * abfd));
	75
	76	/*
	77	All that ..._PRE and ...POST functions are called from the corresponding
	78	coff_swap... functions. The ...PRE functions are called at the beginning
	79	of the function and the ...POST functions at the end of the swap routines.
	80	*/
	81
	82	#define COFF_ADJUST_FILEHDR_IN_POST adjust_filehdr_in_post
	83	#define COFF_ADJUST_FILEHDR_OUT_PRE adjust_filehdr_out_pre
	84	#define COFF_ADJUST_FILEHDR_OUT_POST adjust_filehdr_out_post
	85
	86	#define COFF_ADJUST_SCNHDR_IN_POST adjust_scnhdr_in_post
	87	#define COFF_ADJUST_SCNHDR_OUT_PRE adjust_scnhdr_out_pre
	88	#define COFF_ADJUST_SCNHDR_OUT_POST adjust_scnhdr_out_post
	89
	90	#define COFF_ADJUST_AUX_IN_POST adjust_aux_in_post
	91	#define COFF_ADJUST_AUX_OUT_PRE adjust_aux_out_pre
	92	#define COFF_ADJUST_AUX_OUT_POST adjust_aux_out_post
	93
	94	static boolean
	95	go32_stubbed_coff_bfd_copy_private_bfd_data PARAMS ((bfd * ibfd, bfd * obfd));
	96
	97	#define coff_bfd_copy_private_bfd_data go32_stubbed_coff_bfd_copy_private_bfd_data
	98
	99	#include "coff-i386.c"
	100
	101	/* I hold in the usrdata the stub */
	102	#define bfd_coff_go32stub bfd_usrdata
	103
	104	/* This macro is used, because I cannot assume the endianess of the
	105	host system */
	106	#define _H(index) (bfd_h_get_16(abfd, (bfd_byte )(header+index2)))
	107
252b5132 RH	108	/* These bytes are a 2048-byte DOS executable, which loads the COFF
	109	image into memory and then runs it. It is called 'stub' */
	110
	111	static unsigned char stub_bytes[STUBSIZE] =
	112	{
	113	#include "go32stub.h"
	114	};
	115
	116	/*
	117	I have not commented each swap function below, because the
	118	technique is in any function the same. For the ...in function,
	119	all the pointers are adjusted by adding STUBSIZE and for the
	120	...out function, it is subtracted first and after calling the
	121	standard swap function it is reset to the old value */
	122
	123	/* This macro is used for adjusting the filepointers, which
	124	is done only, if the pointer is nonzero */
	125
	126	#define ADJUST_VAL(val,diff) \
	127	if (val != 0) val += diff
	128
	129	static void
	130	adjust_filehdr_in_post (abfd, src, dst)
	131	bfd *abfd;
	132	PTR src;
	133	PTR dst;
	134	{
	135	FILHDR filehdr_src = (FILHDR ) src;
	136	struct internal_filehdr filehdr_dst = (struct internal_filehdr ) dst;
	137
	138	ADJUST_VAL (filehdr_dst->f_symptr, STUBSIZE);
	139
	140	/* Save now the stub to be used later */
	141	bfd_coff_go32stub (abfd) = (PTR) bfd_alloc (abfd, STUBSIZE);
	142
	143	/* Since this function returns no status, I do not set here
	144	any bfd_error_...
	145	That means, before the use of bfd_coff_go32stub (), this value
	146	should be checked if it is != NULL */
	147	if (bfd_coff_go32stub (abfd) == NULL)
	148	return;
	149	memcpy (bfd_coff_go32stub (abfd), filehdr_src->stub, STUBSIZE);
	150	}
	151
	152	static void
	153	adjust_filehdr_out_pre (abfd, in, out)
	154	bfd *abfd;
	155	PTR in;
	156	PTR out;
	157	{
	158	struct internal_filehdr filehdr_in = (struct internal_filehdr ) in;
	159	FILHDR filehdr_out = (FILHDR ) out;
	160
	161	/* Generate the stub */
	162	create_go32_stub (abfd);
	163
	164	/* Copy the stub to the file header */
	165	if (bfd_coff_go32stub (abfd) != NULL)
	166	memcpy (filehdr_out->stub, bfd_coff_go32stub (abfd), STUBSIZE);
	167	else
	168	/* use the default */
	169	memcpy (filehdr_out->stub, stub_bytes, STUBSIZE);
	170
	171	ADJUST_VAL (filehdr_in->f_symptr, -STUBSIZE);
172	}
173
174	static void
175	adjust_filehdr_out_post (abfd, in, out)
5f771d47	176	bfd *abfd ATTRIBUTE_UNUSED;
252b5132	177	PTR in;
5f771d47	178	PTR out ATTRIBUTE_UNUSED;
252b5132 RH	179	{
	180	struct internal_filehdr filehdr_in = (struct internal_filehdr ) in;
	181	/* undo the above change */
	182	ADJUST_VAL (filehdr_in->f_symptr, STUBSIZE);
	183	}
	184
	185	static void
	186	adjust_scnhdr_in_post (abfd, ext, in)
5f771d47 ILT	187	bfd *abfd ATTRIBUTE_UNUSED;
5f771d47 ILT	188	PTR ext ATTRIBUTE_UNUSED;
252b5132 RH	189	PTR in;
	190	{
	191	struct internal_scnhdr scnhdr_int = (struct internal_scnhdr ) in;
	192
	193	ADJUST_VAL (scnhdr_int->s_scnptr, STUBSIZE);
	194	ADJUST_VAL (scnhdr_int->s_relptr, STUBSIZE);
	195	ADJUST_VAL (scnhdr_int->s_lnnoptr, STUBSIZE);
	196	}
	197
	198	static void
	199	adjust_scnhdr_out_pre (abfd, in, out)
5f771d47	200	bfd *abfd ATTRIBUTE_UNUSED;
252b5132	201	PTR in;
5f771d47	202	PTR out ATTRIBUTE_UNUSED;
252b5132 RH	203	{
	204	struct internal_scnhdr scnhdr_int = (struct internal_scnhdr ) in;
	205
	206	ADJUST_VAL (scnhdr_int->s_scnptr, -STUBSIZE);
	207	ADJUST_VAL (scnhdr_int->s_relptr, -STUBSIZE);
	208	ADJUST_VAL (scnhdr_int->s_lnnoptr, -STUBSIZE);
	209	}
	210
	211	static void
	212	adjust_scnhdr_out_post (abfd, in, out)
5f771d47	213	bfd *abfd ATTRIBUTE_UNUSED;
252b5132	214	PTR in;
5f771d47	215	PTR out ATTRIBUTE_UNUSED;
252b5132 RH	216	{
	217	struct internal_scnhdr scnhdr_int = (struct internal_scnhdr ) in;
	218
	219	ADJUST_VAL (scnhdr_int->s_scnptr, STUBSIZE);
	220	ADJUST_VAL (scnhdr_int->s_relptr, STUBSIZE);
	221	ADJUST_VAL (scnhdr_int->s_lnnoptr, STUBSIZE);
	222	}
	223
	224	static void
	225	adjust_aux_in_post (abfd, ext1, type, class, indx, numaux, in1)
5f771d47 ILT	226	bfd *abfd ATTRIBUTE_UNUSED;
5f771d47 ILT	227	PTR ext1 ATTRIBUTE_UNUSED;
252b5132 RH	228	int type;
252b5132 RH	229	int class;
5f771d47 ILT	230	int indx ATTRIBUTE_UNUSED;
5f771d47 ILT	231	int numaux ATTRIBUTE_UNUSED;
252b5132 RH	232	PTR in1;
	233	{
	234	union internal_auxent in = (union internal_auxent ) in1;
	235
	236	if (class == C_BLOCK \|\| class == C_FCN \|\| ISFCN (type) \|\| ISTAG (class))
	237	{
	238	ADJUST_VAL (in->x_sym.x_fcnary.x_fcn.x_lnnoptr, STUBSIZE);
	239	}
	240	}
	241
	242	static void
	243	adjust_aux_out_pre (abfd, inp, type, class, indx, numaux, extp)
5f771d47	244	bfd *abfd ATTRIBUTE_UNUSED;
252b5132 RH	245	PTR inp;
	246	int type;
	247	int class;
5f771d47 ILT	248	int indx ATTRIBUTE_UNUSED;
	249	int numaux ATTRIBUTE_UNUSED;
	250	PTR extp ATTRIBUTE_UNUSED;
252b5132 RH	251	{
	252	union internal_auxent in = (union internal_auxent ) inp;
	253
	254	if (class == C_BLOCK \|\| class == C_FCN \|\| ISFCN (type) \|\| ISTAG (class))
	255	{
	256	ADJUST_VAL (in->x_sym.x_fcnary.x_fcn.x_lnnoptr, -STUBSIZE);
	257	}
	258	}
	259
	260	static void
	261	adjust_aux_out_post (abfd, inp, type, class, indx, numaux, extp)
5f771d47	262	bfd *abfd ATTRIBUTE_UNUSED;
252b5132 RH	263	PTR inp;
	264	int type;
	265	int class;
5f771d47 ILT	266	int indx ATTRIBUTE_UNUSED;
	267	int numaux ATTRIBUTE_UNUSED;
	268	PTR extp ATTRIBUTE_UNUSED;
252b5132 RH	269	{
	270	union internal_auxent in = (union internal_auxent ) inp;
	271
	272	if (class == C_BLOCK \|\| class == C_FCN \|\| ISFCN (type) \|\| ISTAG (class))
	273	{
	274	ADJUST_VAL (in->x_sym.x_fcnary.x_fcn.x_lnnoptr, STUBSIZE);
	275	}
	276	}
	277
	278	/*
	279	That's the function, which creates the stub. There are
	280	different cases from where the stub is taken.
	281	At first the environment variable $(GO32STUB) is checked and then
	282	$(STUB) if it was not set.
	283	If it exists and points to a valid stub the stub is taken from
	284	that file. This file can be also a whole executable file, because
	285	the stub is computed from the exe information at the start of that
	286	file.
	287
	288	If there was any error, the standard stub (compiled in this file)
	289	is taken.
	290	*/
	291
	292	static void
	293	create_go32_stub (abfd)
	294	bfd *abfd;
	295	{
	296	/* Do it only once */
	297	if (bfd_coff_go32stub (abfd) == NULL)
	298	{
	299	char *stub;
	300	struct stat st;
	301	int f;
	302	unsigned char header[10];
	303	char magic[8];
	304	unsigned long coff_start, exe_start;
	305
	306	/* Check at first the environment variable $(GO32STUB) */
	307	stub = getenv ("GO32STUB");
	308	/* Now check the environment variable $(STUB) */
	309	if (stub == NULL)
	310	stub = getenv ("STUB");
	311	if (stub == NULL)
	312	goto stub_end;
	313	if (stat (stub, &st) != 0)
	314	goto stub_end;
	315	#ifdef O_BINARY
	316	f = open (stub, O_RDONLY \| O_BINARY);
	317	#else
	318	f = open (stub, O_RDONLY);
	319	#endif
	320	if (f < 0)
	321	goto stub_end;
	322	if (read (f, &header, sizeof (header)) < 0)
	323	{
	324	close (f);
	325	goto stub_end;
	326	}
	327	if (_H (0) != 0x5a4d) /* it is not an exe file */
	328	{
	329	close (f);
	330	goto stub_end;
	331	}
	332	/* Compute the size of the stub (it is every thing up
333	to the beginning of the coff image) */
334	coff_start = (long) _H (2) * 512L;
335	if (_H (1))
336	coff_start += (long) _H (1) - 512L;
337
338	/* Currently there is only a fixed stub size of 2048 bytes
339	supported */
340	if (coff_start != 2048)
341	{
342	close (f);
343	goto stub_end;
344	}
345	exe_start = _H (4) * 16;
346	if ((unsigned long) lseek (f, exe_start, SEEK_SET) != exe_start)
347	{
348	close (f);
349	goto stub_end;
350	}
351	if (read (f, &magic, 8) != 8)
352	{
353	close (f);
354	goto stub_end;
355	}
356	if (memcmp (magic, "go32stub", 8) != 0)
357	{
358	close (f);
359	goto stub_end;
360	}
361	/* Now we found a correct stub (hopefully) */
362	bfd_coff_go32stub (abfd) = (PTR) bfd_alloc (abfd, coff_start);
363	if (bfd_coff_go32stub (abfd) == NULL)
364	{
365	close (f);
366	return;
367	}
368	lseek (f, 0L, SEEK_SET);
369	if ((unsigned long) read (f, bfd_coff_go32stub (abfd), coff_start)
370	!= coff_start)
371	{
372	bfd_release (abfd, bfd_coff_go32stub (abfd));
373	bfd_coff_go32stub (abfd) = NULL;
374	}
375	close (f);
376	}
377	stub_end:
378	/* There was something wrong above, so use now the standard builtin
379	stub */
380	if (bfd_coff_go32stub (abfd) == NULL)
381	{
382	bfd_coff_go32stub (abfd) = (PTR) bfd_alloc (abfd, STUBSIZE);
383	if (bfd_coff_go32stub (abfd) == NULL)
384	{
385	return;
386	}
387
388	memcpy (bfd_coff_go32stub (abfd), stub_bytes, STUBSIZE);
389	}
390	}
391
392	/* If ibfd was a stubbed coff image, copy the stub from that bfd
393	to the new obfd.
394	*/
395
396	static boolean
397	go32_stubbed_coff_bfd_copy_private_bfd_data (ibfd, obfd)
398	bfd *ibfd;
399	bfd *obfd;
400	{
401	/* check if both are the same targets */
402	if (ibfd->xvec != obfd->xvec)
403	return true;
404
405	/* check if both have a valid stub */
406	if (bfd_coff_go32stub (ibfd) == NULL
407	\|\| bfd_coff_go32stub (obfd) == NULL)
408	return true;
409
410	/* Now copy the stub */
411	memcpy (bfd_coff_go32stub (obfd), bfd_coff_go32stub (ibfd), STUBSIZE);
412
413	return true;
414	}