coff-z8k.c

早期freebsd实现

/* BFD back-end for Zilog Z800n COFF binaries.
   Copyright 1992 Free Software Foundation, Inc.
   Contributed by Cygnus Support.
   Written by Steve Chamberlain, <[e-mail]>.

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.  */

#include "bfd.h"
#include "sysdep.h"
#include "libbfd.h"
#include "obstack.h"
#include "coff/z8k.h"
#include "coff/internal.h"
#include "libcoff.h"
#include "seclet.h"

extern bfd_error_vector_type bfd_error_vector;

/* Dummy for now */
static bfd_reloc_status_type
DEFUN(func_da, (abfd, reloc_entry, symbol, data, input_section, output_bfd),
    bfd *abfd AND
    arelent *reloc_entry AND
    struct symbol_cache_entry *symbol AND
    PTR data AND
    asection *input_section AND 
    bfd *output_bfd)
{
}

/* Dummy for now */
static bfd_reloc_status_type
DEFUN(func_jr, (abfd, reloc_entry, symbol, data, input_section, output_bfd),
    bfd *abfd AND
    arelent *reloc_entry AND
    struct symbol_cache_entry *symbol AND
    PTR data AND
    asection *input_section AND 
    bfd *output_bfd)
{
}

static reloc_howto_type r_da =
  HOWTO(R_DA , 0,  1, 	16, false, 0, true,
true,func_da,"r_da",	true, 0x0000ffff,0x0000ffff, false);

static reloc_howto_type r_jr = 
 HOWTO(R_JR, 0,1,8,true,0,true,true,func_jr,"r_jr", true,0,0,true);





/* Turn a howto into a reloc number */

static int coff_z8k_select_reloc(howto)
reloc_howto_type *howto;
{
return howto->type;
}
#define SELECT_RELOC(x,howto) x= coff_z8k_select_reloc(howto)


#define BADMAG(x) Z8KBADMAG(x)
#define Z8K 1		/* Customize coffcode.h */
#define __A_MAGIC_SET__



/* Code to swap in the reloc */
#define SWAP_IN_RELOC_OFFSET   bfd_h_get_32
#define SWAP_OUT_RELOC_OFFSET bfd_h_put_32
#define SWAP_OUT_RELOC_EXTRA(abfd, src, dst) \
  dst->r_stuff[0] = 'S'; \
  dst->r_stuff[1] = 'C'; 

/* Code to turn a r_type into a howto ptr, uses the above howto table
   */

static void 
DEFUN(rtype2howto,(internal, dst),
arelent *internal AND
struct internal_reloc *dst)
{
  switch (dst->r_type) {
   default:
    printf("BAD %x\n", dst->r_type);
   case R_DA:
    internal->howto = &r_da;
    break;
   case R_JR:
    internal->howto = &r_jr;
    }
}

#define RTYPE2HOWTO(internal, relocentry) rtype2howto(internal,relocentry)


/* Perform any necessaru magic to the addend in a reloc entry */


#define CALC_ADDEND(abfd, symbol, ext_reloc, cache_ptr) \
 cache_ptr->addend =  ext_reloc.r_offset;

 
#define RELOC_PROCESSING(relent,reloc,symbols,abfd,section) \
 reloc_processing(relent, reloc, symbols, abfd, section)

static void DEFUN(reloc_processing,(relent,reloc, symbols, abfd, section) ,
	   arelent *relent AND
	   struct internal_reloc *reloc AND
	   asymbol **symbols AND
	   bfd *abfd AND
	   asection *section)
{
  relent->address = reloc->r_vaddr;		
  rtype2howto(relent,reloc);

  if (reloc->r_symndx > 0) 
  {
    
    relent->sym_ptr_ptr = symbols + obj_convert(abfd)[reloc->r_symndx];

  }
  else 
  {
    relent->sym_ptr_ptr = &(bfd_abs_symbol);
  }
  

  
  relent->addend = reloc->r_offset;
  
  relent->address-= section->vma;
/*  relent->section = 0;*/
}

static bfd_vma get_value();

static void
extra_case(in_abfd, seclet, reloc, data, src_ptr, dst_ptr)
     bfd *in_abfd;
     bfd_seclet_type *seclet;
     arelent *reloc;
     bfd_byte *data;
     unsigned int *src_ptr;
     unsigned int *dst_ptr;
{
  switch (reloc->howto->type) 
  {
   case R_DA:
    bfd_put_16(in_abfd, get_value(reloc, seclet), data+*dst_ptr);
    (*dst_ptr)+=2;
    ( *src_ptr)+=2;
    break;
   case R_JR:
   {
     bfd_vma dst = get_value(reloc,seclet);
     bfd_vma dot = seclet->offset 
      + *dst_ptr
       + seclet->u.indirect.section->output_section->vma;	  
     int gap = dst - dot - 1 ; /* -1 since were in the odd byte of the
				  word */
     if (gap & 1) 
      abort();
     gap/=2;
     if (gap > 128 || gap< -128) 
     {
       bfd_error_vector.reloc_value_truncated(reloc, seclet);
     }
     bfd_put_8(in_abfd, gap, data+*dst_ptr);
     (*dst_ptr)++;
     (*src_ptr)++;
     break;
   }
   default:
    abort();
  }
}
#define EXTRA_CASES default: extra_case(in_abfd,seclet,reloc, data, &src_address, &dst_address);




#include "coffcode.h"


#undef  coff_bfd_get_relocated_section_contents 
#undef coff_bfd_relax_section
#define  coff_bfd_get_relocated_section_contents bfd_coff_get_relocated_section_contents
#define coff_bfd_relax_section bfd_coff_relax_section

bfd_target z8kcoff_vec =
{
  "coff-z8k",			/* name */
  bfd_target_coff_flavour,
  true,				/* data byte order is big */
  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 */
  '_',				/* leading symbol underscore */
  '/',				/* ar_pad_char */
  15,				/* ar_max_namelen */
  1,				/* minimum section alignment */
  _do_getb64, _do_putb64,  _do_getb32, _do_putb32, _do_getb16, _do_putb16, /* 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_generic_mkarchive, /* bfd_set_format */
   bfd_false},
 {bfd_false, coff_write_object_contents, /* bfd_write_contents */
   _bfd_write_archive_contents, bfd_false},

  JUMP_TABLE(coff),
  COFF_SWAP_TABLE
 };