binutils-gdb/bfd/coff-i960.c

/* Intel 960 COFF support for BFD.
   Copyright (C) 1990-1991 Free Software Foundation, Inc.
   Written by Cygnus Support.

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., 675 Mass Ave, Cambridge, MA 02139, USA.  */

#define I960 1
#define BADMAG(x) I960BADMAG(x)

#include "bfd.h"
#include "sysdep.h"
#include "libbfd.h"
#include "obstack.h"
#include "coff/i960.h"
#include "coff/internal.h"
#include "libcoff.h"		/* to allow easier abstraction-breaking */
#define COFF_LONG_FILENAMES

#define CALLS	 0x66003800	/* Template for 'calls' instruction	*/
#define BAL	 0x0b000000	/* Template for 'bal' instruction	*/
#define BAL_MASK 0x00ffffff

static bfd_reloc_status_type 
DEFUN (optcall_callback, (abfd, reloc_entry, symbol_in, data,
			  ignore_input_section, ignore_bfd),
       bfd *abfd AND
       arelent *reloc_entry AND
       asymbol *symbol_in AND
       PTR data AND
       asection *ignore_input_section AND
       bfd *ignore_bfd)
{
  /* This item has already been relocated correctly, but we may be
   * able to patch in yet better code - done by digging out the
   * correct info on this symbol */
  bfd_reloc_status_type result;
  coff_symbol_type *cs = coffsymbol(symbol_in);

  /* So the target symbol has to be of coff type, and the symbol 
     has to have the correct native information within it */
  if ((cs->symbol.the_bfd->xvec->flavour != bfd_target_coff_flavour)
      || (cs->native == (combined_entry_type *)NULL)) {
     /* This is interesting, consider the case where we're outputting */
     /* coff from a mix n match input, linking from coff to a symbol */
     /* defined in a bout file will cause this match to be true. Should */
     /* I complain ? - This will only work if the bout symbol is non */
     /* leaf. */
     result = bfd_reloc_dangerous;
  }
  else  {
    switch (cs->native->u.syment.n_sclass) 
      {
      case C_LEAFSTAT:
      case C_LEAFEXT:
  	/* This is a call to a leaf procedure, replace instruction with a bal
	 to the correct location */
	{
	  union internal_auxent *aux = &((cs->native+2)->u.auxent);
	  int word = bfd_get_32(abfd, (bfd_byte *)data + reloc_entry->address);
	  int olf = (aux->x_bal.x_balntry - cs->native->u.syment.n_value);
	  BFD_ASSERT(cs->native->u.syment.n_numaux==2);
	  /* We replace the original call instruction with a bal to */
	  /* the bal entry point - the offset of which is described in the */
	  /* 2nd auxent of the original symbol. We keep the native sym and */
	  /* auxents untouched, so the delta between the two is the */
	  /* offset of the bal entry point */

	  word = ((word +  olf)  & BAL_MASK) | BAL;
  	  bfd_put_32(abfd, word, (bfd_byte *) data + reloc_entry->address);
  	}
	result = bfd_reloc_ok;
	break;
      case C_SCALL:
	/* This is a call to a system call, replace with a calls to # */
	BFD_ASSERT(0);
	result = bfd_reloc_ok;
	break;
      default:
	result = bfd_reloc_ok;
	break;
      }
  }
  return result;
}

static reloc_howto_type howto_rellong =
  { (unsigned int) R_RELLONG, 0, 2, 32,false, 0, true, true,
      0,"rellong", true, 0xffffffff, 0xffffffff};
static reloc_howto_type howto_iprmed =
  {  R_IPRMED, 0, 2, 24,true,0, true, true,0,"iprmed ", true,
       0x00ffffff, 0x00ffffff};
static reloc_howto_type howto_optcall =
  {  R_OPTCALL, 0,2,24,true,0, true, true, optcall_callback,
       "optcall", true, 0x00ffffff, 0x00ffffff};

static reloc_howto_type *
DEFUN (coff_i960_reloc_type_lookup, (abfd, code),
       bfd *abfd AND
       bfd_reloc_code_real_type code)
{
  switch (code)
    {
    default:
      return 0;
    case BFD_RELOC_I960_CALLJ:
      return &howto_optcall;
    case BFD_RELOC_32:
      return &howto_rellong;
    case BFD_RELOC_24_PCREL:
      return &howto_iprmed;
    }
}

/* The real code is in coffcode.h */

#define RTYPE2HOWTO(cache_ptr, dst) \
{							\
   reloc_howto_type *howto_ptr;				\
   switch ((dst)->r_type) {				\
     case 17: howto_ptr = &howto_rellong; break;	\
     case 25: howto_ptr = &howto_iprmed; break;		\
     case 27: howto_ptr = &howto_optcall; break;	\
     default: howto_ptr = 0; break;			\
     }							\
   cache_ptr->howto = howto_ptr;			\
 }

#include "coffcode.h"

bfd_target icoff_little_vec =
{
  "coff-Intel-little",		/* name */
  bfd_target_coff_flavour,
  false,			/* data byte order is little */
  false,			/* header byte order is little */

  (HAS_RELOC | EXEC_P |		/* object flags */
   HAS_LINENO | HAS_DEBUG |
   HAS_SYMS | HAS_LOCALS | DYNAMIC | WP_TEXT),

  (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */
  0,				/* leading underscore */
  '/',				/* ar_pad_char */
  15,				/* ar_max_namelen */

  3,				/* minimum alignment power */
  _do_getl64, _do_putl64, _do_getl32, _do_putl32, _do_getl16, _do_putl16, /* data */
  _do_getl64, _do_putl64, _do_getl32, _do_putl32, _do_getl16, _do_putl16, /* hdrs */

 {_bfd_dummy_target, coff_object_p, /* bfd_check_format */
   bfd_generic_archive_p, _bfd_dummy_target},
 {bfd_false, coff_mkobject,	/* bfd_set_format */
   _bfd_generic_mkarchive, bfd_false},
 {bfd_false, coff_write_object_contents, /* bfd_write_contents */
   _bfd_write_archive_contents, bfd_false},
  JUMP_TABLE(coff),
  COFF_SWAP_TABLE,
  coff_i960_reloc_type_lookup,
  coff_make_debug_symbol,
};


bfd_target icoff_big_vec =
{
  "coff-Intel-big",		/* name */
  bfd_target_coff_flavour,
  false,			/* data byte order is little */
  true,				/* header byte order is big */

  (HAS_RELOC | EXEC_P |		/* object flags */
   HAS_LINENO | HAS_DEBUG |
   HAS_SYMS | HAS_LOCALS | DYNAMIC | WP_TEXT),

  (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */
  0,				/* leading underscore */
  '/',				/* ar_pad_char */
  15,				/* ar_max_namelen */

  3,				/* minimum alignment power */
_do_getl64, _do_putl64,  _do_getl32, _do_putl32, _do_getl16, _do_putl16, /* data */
_do_getb64, _do_putb64,  _do_getb32, _do_putb32, _do_getb16, _do_putb16, /* hdrs */

  {_bfd_dummy_target, coff_object_p, /* bfd_check_format */
     bfd_generic_archive_p, _bfd_dummy_target},
  {bfd_false, coff_mkobject,	/* bfd_set_format */
     _bfd_generic_mkarchive, bfd_false},
  {bfd_false, coff_write_object_contents,	/* bfd_write_contents */
     _bfd_write_archive_contents, bfd_false},
  JUMP_TABLE(coff),
  COFF_SWAP_TABLE,
  coff_i960_reloc_type_lookup,
  coff_make_debug_symbol,
};