bfd/coff-z80.c

   1 /* BFD back-end for Zilog Z80 COFF binaries.
   2    Copyright 2005 Free Software Foundation, Inc.
   3    Contributed by Arnold Metselaar <arnold_m@operamail.com>
   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., 51 Franklin Street - Fifth Floor, Boston,
  20    MA 02110-1301, USA.  */
  21
  22 #include "bfd.h"
  23 #include "sysdep.h"
  24 #include "libbfd.h"
  25 #include "bfdlink.h"
  26 #include "coff/z80.h"
  27 #include "coff/internal.h"
  28 #include "libcoff.h"
  29
  30 #define COFF_DEFAULT_SECTION_ALIGNMENT_POWER 0
  31
  32 static reloc_howto_type r_imm32 =
  33 HOWTO (R_IMM32, 0, 1, 32, FALSE, 0,
  34        complain_overflow_dont, 0, "r_imm32", TRUE, 0xffffffff, 0xffffffff,
  35        FALSE);
  36
  37 static reloc_howto_type r_imm16 =
  38 HOWTO (R_IMM16, 0, 1, 16, FALSE, 0,
  39        complain_overflow_dont, 0, "r_imm16", TRUE, 0x0000ffff, 0x0000ffff,
  40        FALSE);
  41
  42 static reloc_howto_type r_imm8 =
  43 HOWTO (R_IMM8, 0, 0, 8, FALSE, 0,
  44        complain_overflow_bitfield, 0, "r_imm8", TRUE, 0x000000ff, 0x000000ff,
  45        FALSE);
  46
  47 static reloc_howto_type r_jr =
  48 HOWTO (R_JR, 0, 0, 8, TRUE, 0,
  49        complain_overflow_signed, 0, "r_jr", FALSE, 0, 0xFF,
  50        FALSE);
  51
  52 static reloc_howto_type r_off8 =
  53 HOWTO (R_OFF8, 0, 0, 8, FALSE, 0,
  54        complain_overflow_signed, 0,"r_off8", FALSE, 0, 0xff,
  55        FALSE);
  56
  57
  58 #define BADMAG(x) Z80BADMAG(x)
  59 #define Z80 1                   /* Customize coffcode.h.  */
  60 #define __A_MAGIC_SET__
  61
  62 /* Code to swap in the reloc.  */
  63
  64 #define SWAP_IN_RELOC_OFFSET    H_GET_32
  65 #define SWAP_OUT_RELOC_OFFSET   H_PUT_32
  66
  67 #define SWAP_OUT_RELOC_EXTRA(abfd, src, dst) \
  68   dst->r_stuff[0] = 'S'; \
  69   dst->r_stuff[1] = 'C';
  70
  71 /* Code to turn a r_type into a howto ptr, uses the above howto table.  */
  72
  73 static void
  74 rtype2howto (arelent *internal, struct internal_reloc *dst)
  75 {
  76   switch (dst->r_type)
  77     {
  78     default:
  79       abort ();
  80       break;
  81     case R_IMM8:
  82       internal->howto = &r_imm8;
  83       break;
  84     case R_IMM16:
  85       internal->howto = &r_imm16;
  86       break;
  87     case R_IMM32:
  88       internal->howto = &r_imm32;
  89       break;
  90     case R_JR:
  91       internal->howto = &r_jr;
  92       break;
  93     case R_OFF8:
  94       internal->howto = &r_off8;
  95       break;
  96     }
  97 }
  98
  99 #define RTYPE2HOWTO(internal, relocentry) rtype2howto (internal, relocentry)
 100
 101 static reloc_howto_type *
 102 coff_z80_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
 103                             bfd_reloc_code_real_type code)
 104 {
 105   switch (code)
 106     {
 107     case BFD_RELOC_8:           return & r_imm8;
 108     case BFD_RELOC_16:          return & r_imm16;
 109     case BFD_RELOC_32:          return & r_imm32;
 110     case BFD_RELOC_8_PCREL:     return & r_jr;
 111     case BFD_RELOC_Z80_DISP8:   return & r_off8;
 112     default:                    BFD_FAIL ();
 113       return NULL;
 114     }
 115 }
 116
 117 /* Perform any necessary magic to the addend in a reloc entry.  */
 118
 119 #define CALC_ADDEND(abfd, symbol, ext_reloc, cache_ptr) \
 120  cache_ptr->addend =  ext_reloc.r_offset;
 121
 122 #define RELOC_PROCESSING(relent,reloc,symbols,abfd,section) \
 123  reloc_processing(relent, reloc, symbols, abfd, section)
 124
 125 static void
 126 reloc_processing (arelent *relent,
 127                   struct internal_reloc *reloc,
 128                   asymbol **symbols,
 129                   bfd *abfd,
 130                   asection *section)
 131 {
 132   relent->address = reloc->r_vaddr;
 133   rtype2howto (relent, reloc);
 134
 135   if (reloc->r_symndx > 0)
 136     relent->sym_ptr_ptr = symbols + obj_convert (abfd)[reloc->r_symndx];
 137   else
 138     relent->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr;
 139
 140   relent->addend = reloc->r_offset;
 141   relent->address -= section->vma;
 142 }
 143
 144 static void
 145 extra_case (bfd *in_abfd,
 146             struct bfd_link_info *link_info,
 147             struct bfd_link_order *link_order,
 148             arelent *reloc,
 149             bfd_byte *data,
 150             unsigned int *src_ptr,
 151             unsigned int *dst_ptr)
 152 {
 153   asection * input_section = link_order->u.indirect.section;
 154   int val;
 155
 156   switch (reloc->howto->type)
 157     {
 158     case R_OFF8:
 159         val = bfd_coff_reloc16_get_value (reloc, link_info,
 160                                            input_section);
 161         if (val>127 || val<-128) /* Test for overflow.  */
 162           {
 163             if (! ((*link_info->callbacks->reloc_overflow)
 164                    (link_info, NULL,
 165                     bfd_asymbol_name (*reloc->sym_ptr_ptr),
 166                     reloc->howto->name, reloc->addend, input_section->owner,
 167                     input_section, reloc->address)))
 168               abort ();
 169           }
 170         bfd_put_8 (in_abfd, val, data + *dst_ptr);
 171         (*dst_ptr) += 1;
 172         (*src_ptr) += 1;
 173       break;
 174
 175     case R_IMM8:
 176       val = bfd_get_16 ( in_abfd, data+*src_ptr)
 177         + bfd_coff_reloc16_get_value (reloc, link_info, input_section);
 178       bfd_put_8 (in_abfd, val, data + *dst_ptr);
 179       (*dst_ptr) += 1;
 180       (*src_ptr) += 1;
 181       break;
 182
 183     case R_IMM16:
 184       val = bfd_get_16 ( in_abfd, data+*src_ptr)
 185         + bfd_coff_reloc16_get_value (reloc, link_info, input_section);
 186       bfd_put_16 (in_abfd, val, data + *dst_ptr);
 187       (*dst_ptr) += 2;
 188       (*src_ptr) += 2;
 189       break;
 190
 191     case R_IMM32:
 192       val = bfd_get_32 ( in_abfd, data+*src_ptr)
 193         + bfd_coff_reloc16_get_value (reloc, link_info, input_section);
 194       bfd_put_32 (in_abfd, val, data + *dst_ptr);
 195       (*dst_ptr) += 4;
 196       (*src_ptr) += 4;
 197       break;
 198
 199     case R_JR:
 200       {
 201         bfd_vma dst = bfd_coff_reloc16_get_value (reloc, link_info,
 202                                                   input_section);
 203         bfd_vma dot = (link_order->offset
 204                        + *dst_ptr
 205                        + input_section->output_section->vma);
 206         int gap = dst - dot - 1;  /* -1, Since the offset is relative
 207                                      to the value of PC after reading
 208                                      the offset.  */
 209
 210         if (gap >= 128 || gap < -128)
 211           {
 212             if (! ((*link_info->callbacks->reloc_overflow)
 213                    (link_info, NULL,
 214                     bfd_asymbol_name (*reloc->sym_ptr_ptr),
 215                     reloc->howto->name, reloc->addend, input_section->owner,
 216                     input_section, reloc->address)))
 217               abort ();
 218           }
 219         bfd_put_8 (in_abfd, gap, data + *dst_ptr);
 220         (*dst_ptr)++;
 221         (*src_ptr)++;
 222         break;
 223       }
 224
 225     default:
 226       abort ();
 227     }
 228 }
 229
 230 #define coff_reloc16_extra_cases    extra_case
 231 #define coff_bfd_reloc_type_lookup  coff_z80_reloc_type_lookup
 232
 233 #include "coffcode.h"
 234
 235 #undef  coff_bfd_get_relocated_section_contents
 236 #define coff_bfd_get_relocated_section_contents \
 237   bfd_coff_reloc16_get_relocated_section_contents
 238
 239 #undef  coff_bfd_relax_section
 240 #define coff_bfd_relax_section bfd_coff_reloc16_relax_section
 241
 242 CREATE_LITTLE_COFF_TARGET_VEC (z80coff_vec, "coff-z80", 0, 0, '\0', NULL,
 243                                COFF_SWAP_TABLE)
 244