bfd/coff-i960.c

   1 /* Intel 960 COFF support for BFD.
   2    Copyright (C) 1990-1991 Free Software Foundation, Inc.
   3    Written by Cygnus Support.
   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., 675 Mass Ave, Cambridge, MA 02139, USA.  */
  20
  21 /* $Id$ */
  22
  23 #define I960 1
  24 #define BADMAG(x) I960BADMAG(x)
  25
  26 #include "bfd.h"
  27 #include "sysdep.h"
  28 #include "libbfd.h"
  29 #include "obstack.h"
  30 #include "coff/i960.h"
  31 #include "coff/internal.h"
  32 #include "libcoff.h"            /* to allow easier abstraction-breaking */
  33
  34
  35 #define CALLS    0x66003800     /* Template for 'calls' instruction     */
  36 #define BAL      0x0b000000     /* Template for 'bal' instruction       */
  37 #define BAL_MASK 0x00ffffff
  38
  39 static bfd_reloc_status_type
  40 DEFUN (optcall_callback, (abfd, reloc_entry, symbol_in, data, ignore_input_section),
  41        bfd *abfd AND
  42        arelent *reloc_entry AND
  43        asymbol *symbol_in AND
  44        PTR data AND
  45        asection *ignore_input_section)
  46 {
  47   /* This item has already been relocated correctly, but we may be
  48    * able to patch in yet better code - done by digging out the
  49    * correct info on this symbol */
  50   bfd_reloc_status_type result;
  51   coff_symbol_type *cs = coffsymbol(symbol_in);
  52
  53   /* So the target symbol has to be of coff type, and the symbol
  54      has to have the correct native information within it */
  55   if ((cs->symbol.the_bfd->xvec->flavour != bfd_target_coff_flavour)
  56       || (cs->native == (combined_entry_type *)NULL)) {
  57      /* This is interesting, consider the case where we're outputting */
  58      /* coff from a mix n match input, linking from coff to a symbol */
  59      /* defined in a bout file will cause this match to be true. Should */
  60      /* I complain ? - This will only work if the bout symbol is non */
  61      /* leaf. */
  62      result = bfd_reloc_dangerous;
  63   }
  64   else  {
  65     switch (cs->native->u.syment.n_sclass)
  66       {
  67       case C_LEAFSTAT:
  68       case C_LEAFEXT:
  69         /* This is a call to a leaf procedure, replace instruction with a bal
  70          to the correct location */
  71         {
  72           union internal_auxent *aux = &((cs->native+2)->u.auxent);
  73           int word = bfd_get_32(abfd, (bfd_byte *)data + reloc_entry->address);
  74           int olf = (aux->x_bal.x_balntry - cs->native->u.syment.n_value);
  75           BFD_ASSERT(cs->native->u.syment.n_numaux==2);
  76           /* We replace the original call instruction with a bal to */
  77           /* the bal entry point - the offset of which is described in the */
  78           /* 2nd auxent of the original symbol. We keep the native sym and */
  79           /* auxents untouched, so the delta between the two is the */
  80           /* offset of the bal entry point */
  81
  82           word = ((word +  olf)  & BAL_MASK) | BAL;
  83           bfd_put_32(abfd, word, (bfd_byte *) data + reloc_entry->address);
  84         }
  85         result = bfd_reloc_ok;
  86         break;
  87       case C_SCALL:
  88         /* This is a call to a system call, replace with a calls to # */
  89         BFD_ASSERT(0);
  90         result = bfd_reloc_ok;
  91         break;
  92       default:
  93         result = bfd_reloc_ok;
  94         break;
  95       }
  96   }
  97   return result;
  98 }
  99
 100 static reloc_howto_type howto_rellong =
 101   { (unsigned int) R_RELLONG, 0, 2, 32,false, 0, true, true,
 102       0,"rellong", true, 0xffffffff, 0xffffffff};
 103 static reloc_howto_type howto_iprmed =
 104   {  R_IPRMED, 0, 2, 24,true,0, true, true,0,"iprmed ", true,
 105        0x00ffffff, 0x00ffffff};
 106 static reloc_howto_type howto_optcall =
 107   {  R_OPTCALL, 0,2,24,true,0, true, true, optcall_callback,
 108        "optcall", true, 0x00ffffff, 0x00ffffff};
 109
 110 static reloc_howto_type *
 111 DEFUN (coff_i960_reloc_type_lookup, (abfd, code),
 112        bfd *abfd AND
 113        bfd_reloc_code_type code)
 114 {
 115   switch (code)
 116     {
 117     default:
 118       return 0;
 119     case BFD_RELOC_I960_CALLJ:
 120       return &howto_optcall;
 121     case BFD_RELOC_32:
 122       return &howto_rellong;
 123     case BFD_RELOC_24_PCREL:
 124       return &howto_iprmed;
 125     }
 126 }
 127
 128 /* The real code is in coffcode.h */
 129
 130 #define RTYPE2HOWTO(cache_ptr, dst) \
 131 {                                                       \
 132    reloc_howto_type *howto_ptr;                         \
 133    switch ((dst)->r_type) {                             \
 134      case 17: howto_ptr = &howto_rellong; break;        \
 135      case 25: howto_ptr = &howto_iprmed; break;         \
 136      case 27: howto_ptr = &howto_optcall; break;        \
 137      default: howto_ptr = 0; break;                     \
 138      }                                                  \
 139    cache_ptr->howto = howto_ptr;                        \
 140  }
 141
 142 #include "coffcode.h"
 143
 144 bfd_target icoff_little_vec =
 145 {
 146   "coff-Intel-little",          /* name */
 147   bfd_target_coff_flavour,
 148   false,                        /* data byte order is little */
 149   false,                        /* header byte order is little */
 150
 151   (HAS_RELOC | EXEC_P |         /* object flags */
 152    HAS_LINENO | HAS_DEBUG |
 153    HAS_SYMS | HAS_LOCALS | DYNAMIC | WP_TEXT),
 154
 155   (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */
 156   '/',                          /* ar_pad_char */
 157   15,                           /* ar_max_namelen */
 158
 159      3,                         /* minimum alignment power */
 160   _do_getl64, _do_putl64, _do_getl32, _do_putl32, _do_getl16, _do_putl16, /* data */
 161   _do_getl64, _do_putl64, _do_getl32, _do_putl32, _do_getl16, _do_putl16, /* hdrs */
 162
 163     {_bfd_dummy_target, coff_object_p, /* bfd_check_format */
 164        bfd_generic_archive_p, _bfd_dummy_target},
 165     {bfd_false, coff_mkobject,  /* bfd_set_format */
 166        _bfd_generic_mkarchive, bfd_false},
 167     {bfd_false, coff_write_object_contents, /* bfd_write_contents */
 168        _bfd_write_archive_contents, bfd_false},
 169   JUMP_TABLE(coff),
 170   COFF_SWAP_TABLE,
 171   coff_i960_reloc_type_lookup,
 172   coff_make_debug_symbol,
 173 };
 174
 175
 176 bfd_target icoff_big_vec =
 177 {
 178   "coff-Intel-big",             /* name */
 179   bfd_target_coff_flavour,
 180   false,                        /* data byte order is little */
 181   true,                         /* header byte order is big */
 182
 183   (HAS_RELOC | EXEC_P |         /* object flags */
 184    HAS_LINENO | HAS_DEBUG |
 185    HAS_SYMS | HAS_LOCALS | DYNAMIC | WP_TEXT),
 186
 187   (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */
 188   '/',                          /* ar_pad_char */
 189   15,                           /* ar_max_namelen */
 190
 191   3,                            /* minimum alignment power */
 192 _do_getl64, _do_putl64,  _do_getl32, _do_putl32, _do_getl16, _do_putl16, /* data */
 193 _do_getb64, _do_putb64,  _do_getb32, _do_putb32, _do_getb16, _do_putb16, /* hdrs */
 194
 195   {_bfd_dummy_target, coff_object_p, /* bfd_check_format */
 196      bfd_generic_archive_p, _bfd_dummy_target},
 197   {bfd_false, coff_mkobject,    /* bfd_set_format */
 198      _bfd_generic_mkarchive, bfd_false},
 199   {bfd_false, coff_write_object_contents,       /* bfd_write_contents */
 200      _bfd_write_archive_contents, bfd_false},
 201   JUMP_TABLE(coff),
 202   COFF_SWAP_TABLE,
 203   coff_i960_reloc_type_lookup,
 204   coff_make_debug_symbol,
 205 };