bfd/coff-z80.c

   1 /* BFD back-end for Zilog Z80 COFF binaries.
   2    Copyright (C) 2005-2019 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 3 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 "sysdep.h"
  23 #include "bfd.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, 2, 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       internal->howto = NULL;
  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 static reloc_howto_type *
 127 coff_z80_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
 128                             const char *r_name)
 129 {
 130   if (strcasecmp (r_imm8.name, r_name) == 0)
 131     return &r_imm8;
 132   if (strcasecmp (r_imm16.name, r_name) == 0)
 133     return &r_imm16;
 134   if (strcasecmp (r_imm24.name, r_name) == 0)
 135     return &r_imm24;
 136   if (strcasecmp (r_imm32.name, r_name) == 0)
 137     return &r_imm32;
 138   if (strcasecmp (r_jr.name, r_name) == 0)
 139     return &r_jr;
 140   if (strcasecmp (r_off8.name, r_name) == 0)
 141     return &r_off8;
 142
 143   return NULL;
 144 }
 145
 146 /* Perform any necessary magic to the addend in a reloc entry.  */
 147
 148 #define CALC_ADDEND(abfd, symbol, ext_reloc, cache_ptr) \
 149  cache_ptr->addend =  ext_reloc.r_offset;
 150
 151 #define RELOC_PROCESSING(relent,reloc,symbols,abfd,section) \
 152  reloc_processing(relent, reloc, symbols, abfd, section)
 153
 154 static void
 155 reloc_processing (arelent *relent,
 156                   struct internal_reloc *reloc,
 157                   asymbol **symbols,
 158                   bfd *abfd,
 159                   asection *section)
 160 {
 161   relent->address = reloc->r_vaddr;
 162   rtype2howto (relent, reloc);
 163
 164   if (reloc->r_symndx > 0)
 165     relent->sym_ptr_ptr = symbols + obj_convert (abfd)[reloc->r_symndx];
 166   else
 167     relent->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr;
 168
 169   relent->addend = reloc->r_offset;
 170   relent->address -= section->vma;
 171 }
 172
 173 static void
 174 extra_case (bfd *in_abfd,
 175             struct bfd_link_info *link_info,
 176             struct bfd_link_order *link_order,
 177             arelent *reloc,
 178             bfd_byte *data,
 179             unsigned int *src_ptr,
 180             unsigned int *dst_ptr)
 181 {
 182   asection * input_section = link_order->u.indirect.section;
 183   int val;
 184
 185   switch (reloc->howto->type)
 186     {
 187     case R_OFF8:
 188         val = bfd_coff_reloc16_get_value (reloc, link_info,
 189                                            input_section);
 190         if (val>127 || val<-128) /* Test for overflow.  */
 191           (*link_info->callbacks->reloc_overflow)
 192             (link_info, NULL, bfd_asymbol_name (*reloc->sym_ptr_ptr),
 193              reloc->howto->name, reloc->addend, input_section->owner,
 194              input_section, reloc->address);
 195
 196         bfd_put_8 (in_abfd, val, data + *dst_ptr);
 197         (*dst_ptr) += 1;
 198         (*src_ptr) += 1;
 199       break;
 200
 201     case R_IMM8:
 202       val = bfd_get_8 ( in_abfd, data+*src_ptr)
 203         + bfd_coff_reloc16_get_value (reloc, link_info, input_section);
 204       bfd_put_8 (in_abfd, val, data + *dst_ptr);
 205       (*dst_ptr) += 1;
 206       (*src_ptr) += 1;
 207       break;
 208
 209     case R_IMM16:
 210       val = bfd_get_16 ( in_abfd, data+*src_ptr)
 211         + bfd_coff_reloc16_get_value (reloc, link_info, input_section);
 212       bfd_put_16 (in_abfd, val, data + *dst_ptr);
 213       (*dst_ptr) += 2;
 214       (*src_ptr) += 2;
 215       break;
 216
 217     case R_IMM24:
 218       val = bfd_get_16 ( in_abfd, data+*src_ptr)
 219         + (bfd_get_8 ( in_abfd, data+*src_ptr+2) << 16)
 220         + bfd_coff_reloc16_get_value (reloc, link_info, input_section);
 221       bfd_put_16 (in_abfd, val, data + *dst_ptr);
 222       bfd_put_8 (in_abfd, val >> 16, data + *dst_ptr+2);
 223       (*dst_ptr) += 3;
 224       (*src_ptr) += 3;
 225       break;
 226
 227     case R_IMM32:
 228       val = bfd_get_32 ( in_abfd, data+*src_ptr)
 229         + bfd_coff_reloc16_get_value (reloc, link_info, input_section);
 230       bfd_put_32 (in_abfd, val, data + *dst_ptr);
 231       (*dst_ptr) += 4;
 232       (*src_ptr) += 4;
 233       break;
 234
 235     case R_JR:
 236       {
 237         bfd_vma dst = bfd_coff_reloc16_get_value (reloc, link_info,
 238                                                   input_section);
 239         bfd_vma dot = (*dst_ptr
 240                        + input_section->output_offset
 241                        + input_section->output_section->vma);
 242         int gap = dst - dot - 1;  /* -1, Since the offset is relative
 243                                      to the value of PC after reading
 244                                      the offset.  */
 245
 246         if (gap >= 128 || gap < -128)
 247           (*link_info->callbacks->reloc_overflow)
 248             (link_info, NULL, bfd_asymbol_name (*reloc->sym_ptr_ptr),
 249              reloc->howto->name, reloc->addend, input_section->owner,
 250              input_section, reloc->address);
 251
 252         bfd_put_8 (in_abfd, gap, data + *dst_ptr);
 253         (*dst_ptr)++;
 254         (*src_ptr)++;
 255         break;
 256       }
 257
 258     default:
 259       abort ();
 260     }
 261 }
 262
 263 #define coff_reloc16_extra_cases    extra_case
 264 #define coff_bfd_reloc_type_lookup  coff_z80_reloc_type_lookup
 265 #define coff_bfd_reloc_name_lookup coff_z80_reloc_name_lookup
 266
 267 #ifndef bfd_pe_print_pdata
 268 #define bfd_pe_print_pdata      NULL
 269 #endif
 270
 271 #include "coffcode.h"
 272
 273 #undef  coff_bfd_get_relocated_section_contents
 274 #define coff_bfd_get_relocated_section_contents \
 275   bfd_coff_reloc16_get_relocated_section_contents
 276
 277 #undef  coff_bfd_relax_section
 278 #define coff_bfd_relax_section bfd_coff_reloc16_relax_section
 279
 280 CREATE_LITTLE_COFF_TARGET_VEC (z80_coff_vec, "coff-z80", 0,
 281                                SEC_CODE | SEC_DATA, '\0', NULL,
 282                                COFF_SWAP_TABLE)
 283