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_imm24 =
  38 HOWTO (R_IMM24, 0, 1, 24, FALSE, 0,
  39        complain_overflow_dont, 0, "r_imm24", TRUE, 0x00ffffff, 0x00ffffff,
  40        FALSE);
  41
  42 static reloc_howto_type r_imm16 =
  43 HOWTO (R_IMM16, 0, 1, 16, FALSE, 0,
  44        complain_overflow_dont, 0, "r_imm16", TRUE, 0x0000ffff, 0x0000ffff,
  45        FALSE);
  46
  47 static reloc_howto_type r_imm8 =
  48 HOWTO (R_IMM8, 0, 0, 8, FALSE, 0,
  49        complain_overflow_bitfield, 0, "r_imm8", TRUE, 0x000000ff, 0x000000ff,
  50        FALSE);
  51
  52 static reloc_howto_type r_jr =
  53 HOWTO (R_JR, 0, 0, 8, TRUE, 0,
  54        complain_overflow_signed, 0, "r_jr", FALSE, 0, 0xFF,
  55        FALSE);
  56
  57 static reloc_howto_type r_off8 =
  58 HOWTO (R_OFF8, 0, 0, 8, FALSE, 0,
  59        complain_overflow_signed, 0,"r_off8", FALSE, 0, 0xff,
  60        FALSE);
  61
  62
  63 #define BADMAG(x) Z80BADMAG(x)
  64 #define Z80 1                   /* Customize coffcode.h.  */
  65 #define __A_MAGIC_SET__
  66
  67 /* Code to swap in the reloc.  */
  68
  69 #define SWAP_IN_RELOC_OFFSET    H_GET_32
  70 #define SWAP_OUT_RELOC_OFFSET   H_PUT_32
  71
  72 #define SWAP_OUT_RELOC_EXTRA(abfd, src, dst) \
  73   dst->r_stuff[0] = 'S'; \
  74   dst->r_stuff[1] = 'C';
  75
  76 /* Code to turn a r_type into a howto ptr, uses the above howto table.  */
  77
  78 static void
  79 rtype2howto (arelent *internal, struct internal_reloc *dst)
  80 {
  81   switch (dst->r_type)
  82     {
  83     default:
  84       abort ();
  85       break;
  86     case R_IMM8:
  87       internal->howto = &r_imm8;
  88       break;
  89     case R_IMM16:
  90       internal->howto = &r_imm16;
  91       break;
  92     case R_IMM24:
  93       internal->howto = &r_imm24;
  94       break;
  95     case R_IMM32:
  96       internal->howto = &r_imm32;
  97       break;
  98     case R_JR:
  99       internal->howto = &r_jr;
 100       break;
 101     case R_OFF8:
 102       internal->howto = &r_off8;
 103       break;
 104     }
 105 }
 106
 107 #define RTYPE2HOWTO(internal, relocentry) rtype2howto (internal, relocentry)
 108
 109 static reloc_howto_type *
 110 coff_z80_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
 111                             bfd_reloc_code_real_type code)
 112 {
 113   switch (code)
 114     {
 115     case BFD_RELOC_8:           return & r_imm8;
 116     case BFD_RELOC_16:          return & r_imm16;
 117     case BFD_RELOC_24:          return & r_imm24;
 118     case BFD_RELOC_32:          return & r_imm32;
 119     case BFD_RELOC_8_PCREL:     return & r_jr;
 120     case BFD_RELOC_Z80_DISP8:   return & r_off8;
 121     default:                    BFD_FAIL ();
 122       return NULL;
 123     }
 124 }
 125
 126 /* Perform any necessary magic to the addend in a reloc entry.  */
 127
 128 #define CALC_ADDEND(abfd, symbol, ext_reloc, cache_ptr) \
 129  cache_ptr->addend =  ext_reloc.r_offset;
 130
 131 #define RELOC_PROCESSING(relent,reloc,symbols,abfd,section) \
 132  reloc_processing(relent, reloc, symbols, abfd, section)
 133
 134 static void
 135 reloc_processing (arelent *relent,
 136                   struct internal_reloc *reloc,
 137                   asymbol **symbols,
 138                   bfd *abfd,
 139                   asection *section)
 140 {
 141   relent->address = reloc->r_vaddr;
 142   rtype2howto (relent, reloc);
 143
 144   if (reloc->r_symndx > 0)
 145     relent->sym_ptr_ptr = symbols + obj_convert (abfd)[reloc->r_symndx];
 146   else
 147     relent->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr;
 148
 149   relent->addend = reloc->r_offset;
 150   relent->address -= section->vma;
 151 }
 152
 153 static void
 154 extra_case (bfd *in_abfd,
 155             struct bfd_link_info *link_info,
 156             struct bfd_link_order *link_order,
 157             arelent *reloc,
 158             bfd_byte *data,
 159             unsigned int *src_ptr,
 160             unsigned int *dst_ptr)
 161 {
 162   asection * input_section = link_order->u.indirect.section;
 163   int val;
 164
 165   switch (reloc->howto->type)
 166     {
 167     case R_OFF8:
 168         val = bfd_coff_reloc16_get_value (reloc, link_info,
 169                                            input_section);
 170         if (val>127 || val<-128) /* Test for overflow.  */
 171           {
 172             if (! ((*link_info->callbacks->reloc_overflow)
 173                    (link_info, NULL,
 174                     bfd_asymbol_name (*reloc->sym_ptr_ptr),
 175                     reloc->howto->name, reloc->addend, input_section->owner,
 176                     input_section, reloc->address)))
 177               abort ();
 178           }
 179         bfd_put_8 (in_abfd, val, data + *dst_ptr);
 180         (*dst_ptr) += 1;
 181         (*src_ptr) += 1;
 182       break;
 183
 184     case R_IMM8:
 185       val = bfd_get_8 ( in_abfd, data+*src_ptr)
 186         + bfd_coff_reloc16_get_value (reloc, link_info, input_section);
 187       bfd_put_8 (in_abfd, val, data + *dst_ptr);
 188       (*dst_ptr) += 1;
 189       (*src_ptr) += 1;
 190       break;
 191
 192     case R_IMM16:
 193       val = bfd_get_16 ( in_abfd, data+*src_ptr)
 194         + bfd_coff_reloc16_get_value (reloc, link_info, input_section);
 195       bfd_put_16 (in_abfd, val, data + *dst_ptr);
 196       (*dst_ptr) += 2;
 197       (*src_ptr) += 2;
 198       break;
 199
 200     case R_IMM24:
 201       val = bfd_get_16 ( in_abfd, data+*src_ptr)
 202         + (bfd_get_8 ( in_abfd, data+*src_ptr+2) << 16)
 203         + bfd_coff_reloc16_get_value (reloc, link_info, input_section);
 204       bfd_put_16 (in_abfd, val, data + *dst_ptr);
 205       bfd_put_8 (in_abfd, val >> 16, data + *dst_ptr+2);
 206       (*dst_ptr) += 3;
 207       (*src_ptr) += 3;
 208       break;
 209
 210     case R_IMM32:
 211       val = bfd_get_32 ( in_abfd, data+*src_ptr)
 212         + bfd_coff_reloc16_get_value (reloc, link_info, input_section);
 213       bfd_put_32 (in_abfd, val, data + *dst_ptr);
 214       (*dst_ptr) += 4;
 215       (*src_ptr) += 4;
 216       break;
 217
 218     case R_JR:
 219       {
 220         bfd_vma dst = bfd_coff_reloc16_get_value (reloc, link_info,
 221                                                   input_section);
 222         bfd_vma dot = (*dst_ptr
 223                        + input_section->output_offset
 224                        + input_section->output_section->vma);
 225         int gap = dst - dot - 1;  /* -1, Since the offset is relative
 226                                      to the value of PC after reading
 227                                      the offset.  */
 228
 229         if (gap >= 128 || gap < -128)
 230           {
 231             if (! ((*link_info->callbacks->reloc_overflow)
 232                    (link_info, NULL,
 233                     bfd_asymbol_name (*reloc->sym_ptr_ptr),
 234                     reloc->howto->name, reloc->addend, input_section->owner,
 235                     input_section, reloc->address)))
 236               abort ();
 237           }
 238         bfd_put_8 (in_abfd, gap, data + *dst_ptr);
 239         (*dst_ptr)++;
 240         (*src_ptr)++;
 241         break;
 242       }
 243
 244     default:
 245       abort ();
 246     }
 247 }
 248
 249 #define coff_reloc16_extra_cases    extra_case
 250 #define coff_bfd_reloc_type_lookup  coff_z80_reloc_type_lookup
 251
 252 #include "coffcode.h"
 253
 254 #undef  coff_bfd_get_relocated_section_contents
 255 #define coff_bfd_get_relocated_section_contents \
 256   bfd_coff_reloc16_get_relocated_section_contents
 257
 258 #undef  coff_bfd_relax_section
 259 #define coff_bfd_relax_section bfd_coff_reloc16_relax_section
 260
 261 CREATE_LITTLE_COFF_TARGET_VEC (z80coff_vec, "coff-z80", 0, 0, '\0', NULL,
 262                                COFF_SWAP_TABLE)
 263