1/* BFD back-end for Zilog Z80 COFF binaries. 2 Copyright (C) 2005-2017 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 32static reloc_howto_type r_imm32 = 33HOWTO (R_IMM32, 0, 2, 32, FALSE, 0, 34 complain_overflow_dont, 0, "r_imm32", TRUE, 0xffffffff, 0xffffffff, 35 FALSE); 36 37static reloc_howto_type r_imm24 = 38HOWTO (R_IMM24, 0, 1, 24, FALSE, 0, 39 complain_overflow_dont, 0, "r_imm24", TRUE, 0x00ffffff, 0x00ffffff, 40 FALSE); 41 42static reloc_howto_type r_imm16 = 43HOWTO (R_IMM16, 0, 1, 16, FALSE, 0, 44 complain_overflow_dont, 0, "r_imm16", TRUE, 0x0000ffff, 0x0000ffff, 45 FALSE); 46 47static reloc_howto_type r_imm8 = 48HOWTO (R_IMM8, 0, 0, 8, FALSE, 0, 49 complain_overflow_bitfield, 0, "r_imm8", TRUE, 0x000000ff, 0x000000ff, 50 FALSE); 51 52static reloc_howto_type r_jr = 53HOWTO (R_JR, 0, 0, 8, TRUE, 0, 54 complain_overflow_signed, 0, "r_jr", FALSE, 0, 0xFF, 55 FALSE); 56 57static reloc_howto_type r_off8 = 58HOWTO (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 78static void 79rtype2howto (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 109static reloc_howto_type * 110coff_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 126static reloc_howto_type * 127coff_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 154static void 155reloc_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 173static void 174extra_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 280CREATE_LITTLE_COFF_TARGET_VEC (z80_coff_vec, "coff-z80", 0, 281 SEC_CODE | SEC_DATA, '\0', NULL, 282 COFF_SWAP_TABLE) 283 284