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) 263 264