| 1 | /* BFD back-end for Zilog Z80 COFF binaries. |
| 2 | Copyright (C) 2005-2020 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 | #include "libiberty.h" |
| 30 | |
| 31 | #define COFF_DEFAULT_SECTION_ALIGNMENT_POWER 0 |
| 32 | |
| 33 | typedef struct { |
| 34 | bfd_reloc_code_real_type r_type; |
| 35 | reloc_howto_type howto; |
| 36 | } bfd_howto_type; |
| 37 | |
| 38 | #define BFD_EMPTY_HOWTO(rt,x) {rt, EMPTY_HOWTO(x)} |
| 39 | #define BFD_HOWTO(rt,a,b,c,d,e,f,g,h,i,j,k,l,m) {rt, HOWTO(a,b,c,d,e,f,g,h,i,j,k,l,m)} |
| 40 | |
| 41 | static bfd_howto_type howto_table[] = |
| 42 | { |
| 43 | BFD_EMPTY_HOWTO (BFD_RELOC_NONE, 0), |
| 44 | |
| 45 | BFD_HOWTO (BFD_RELOC_32, |
| 46 | R_IMM32, /* type */ |
| 47 | 0, /* rightshift */ |
| 48 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 49 | 32, /* bitsize */ |
| 50 | FALSE, /* pc_relative */ |
| 51 | 0, /* bitpos */ |
| 52 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 53 | 0, /* special_function */ |
| 54 | "r_imm32", /* name */ |
| 55 | FALSE, /* partial_inplace */ |
| 56 | 0xffffffff, /* src_mask */ |
| 57 | 0xffffffff, /* dst_mask */ |
| 58 | FALSE), /* pcrel_offset */ |
| 59 | |
| 60 | BFD_HOWTO (BFD_RELOC_24, |
| 61 | R_IMM24, /* type */ |
| 62 | 0, /* rightshift */ |
| 63 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 64 | 24, /* bitsize */ |
| 65 | FALSE, /* pc_relative */ |
| 66 | 0, /* bitpos */ |
| 67 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 68 | 0, /* special_function */ |
| 69 | "r_imm24", /* name */ |
| 70 | FALSE, /* partial_inplace */ |
| 71 | 0x00ffffff, /* src_mask */ |
| 72 | 0x00ffffff, /* dst_mask */ |
| 73 | FALSE), /* pcrel_offset */ |
| 74 | |
| 75 | BFD_HOWTO (BFD_RELOC_16, |
| 76 | R_IMM16, /* type */ |
| 77 | 0, /* rightshift */ |
| 78 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 79 | 16, /* bitsize */ |
| 80 | FALSE, /* pc_relative */ |
| 81 | 0, /* bitpos */ |
| 82 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 83 | 0, /* special_function */ |
| 84 | "r_imm16", /* name */ |
| 85 | FALSE, /* partial_inplace */ |
| 86 | 0x0000ffff, /* src_mask */ |
| 87 | 0x0000ffff, /* dst_mask */ |
| 88 | FALSE), /* pcrel_offset */ |
| 89 | |
| 90 | BFD_HOWTO (BFD_RELOC_8, |
| 91 | R_IMM8, /* type */ |
| 92 | 0, /* rightshift */ |
| 93 | 0, /* size (0 = byte, 1 = short, 2 = long) */ |
| 94 | 8, /* bitsize */ |
| 95 | FALSE, /* pc_relative */ |
| 96 | 0, /* bitpos */ |
| 97 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 98 | 0, /* special_function */ |
| 99 | "r_imm8", /* name */ |
| 100 | FALSE, /* partial_inplace */ |
| 101 | 0x000000ff, /* src_mask */ |
| 102 | 0x000000ff, /* dst_mask */ |
| 103 | FALSE), /* pcrel_offset */ |
| 104 | |
| 105 | BFD_HOWTO (BFD_RELOC_8_PCREL, |
| 106 | R_JR, /* type */ |
| 107 | 0, /* rightshift */ |
| 108 | 0, /* size (0 = byte, 1 = short, 2 = long) */ |
| 109 | 8, /* bitsize */ |
| 110 | TRUE, /* pc_relative */ |
| 111 | 0, /* bitpos */ |
| 112 | complain_overflow_signed, /* complain_on_overflow */ |
| 113 | 0, /* special_function */ |
| 114 | "r_jr", /* name */ |
| 115 | FALSE, /* partial_inplace */ |
| 116 | 0, /* src_mask */ |
| 117 | 0xFF, /* dst_mask */ |
| 118 | TRUE), /* pcrel_offset */ |
| 119 | |
| 120 | BFD_HOWTO (BFD_RELOC_Z80_DISP8, |
| 121 | R_OFF8, /* type */ |
| 122 | 0, /* rightshift */ |
| 123 | 0, /* size (0 = byte, 1 = short, 2 = long) */ |
| 124 | 8, /* bitsize */ |
| 125 | FALSE, /* pc_relative */ |
| 126 | 0, /* bitpos */ |
| 127 | complain_overflow_signed, /* complain_on_overflow */ |
| 128 | 0, /* special_function */ |
| 129 | "r_off8", /* name */ |
| 130 | FALSE, /* partial_inplace */ |
| 131 | 0, /* src_mask */ |
| 132 | 0xff, /* dst_mask */ |
| 133 | FALSE), /* pcrel_offset */ |
| 134 | |
| 135 | BFD_HOWTO (BFD_RELOC_Z80_BYTE0, |
| 136 | R_BYTE0, /* type */ |
| 137 | 0, /* rightshift */ |
| 138 | 0, /* size (0 = byte, 1 = short, 2 = long) */ |
| 139 | 8, /* bitsize */ |
| 140 | FALSE, /* pc_relative */ |
| 141 | 0, /* bitpos */ |
| 142 | complain_overflow_dont, /* complain_on_overflow */ |
| 143 | 0, /* special_function */ |
| 144 | "r_byte0", /* name */ |
| 145 | FALSE, /* partial_inplace */ |
| 146 | 0, /* src_mask */ |
| 147 | 0xff, /* dst_mask */ |
| 148 | FALSE), /* pcrel_offset */ |
| 149 | |
| 150 | BFD_HOWTO (BFD_RELOC_Z80_BYTE1, |
| 151 | R_BYTE1, /* type */ |
| 152 | 8, /* rightshift */ |
| 153 | 0, /* size (0 = byte, 1 = short, 2 = long) */ |
| 154 | 8, /* bitsize */ |
| 155 | FALSE, /* pc_relative */ |
| 156 | 0, /* bitpos */ |
| 157 | complain_overflow_dont, /* complain_on_overflow */ |
| 158 | 0, /* special_function */ |
| 159 | "r_byte1", /* name */ |
| 160 | FALSE, /* partial_inplace */ |
| 161 | 0, /* src_mask */ |
| 162 | 0xff, /* dst_mask */ |
| 163 | FALSE), /* pcrel_offset */ |
| 164 | |
| 165 | BFD_HOWTO (BFD_RELOC_Z80_BYTE2, |
| 166 | R_BYTE2, /* type */ |
| 167 | 16, /* rightshift */ |
| 168 | 0, /* size (0 = byte, 1 = short, 2 = long) */ |
| 169 | 8, /* bitsize */ |
| 170 | FALSE, /* pc_relative */ |
| 171 | 0, /* bitpos */ |
| 172 | complain_overflow_dont, /* complain_on_overflow */ |
| 173 | 0, /* special_function */ |
| 174 | "r_byte2", /* name */ |
| 175 | FALSE, /* partial_inplace */ |
| 176 | 0, /* src_mask */ |
| 177 | 0xff, /* dst_mask */ |
| 178 | FALSE), /* pcrel_offset */ |
| 179 | |
| 180 | BFD_HOWTO (BFD_RELOC_Z80_BYTE3, |
| 181 | R_BYTE3, /* type */ |
| 182 | 24, /* rightshift */ |
| 183 | 0, /* size (0 = byte, 1 = short, 2 = long) */ |
| 184 | 8, /* bitsize */ |
| 185 | FALSE, /* pc_relative */ |
| 186 | 0, /* bitpos */ |
| 187 | complain_overflow_dont, /* complain_on_overflow */ |
| 188 | 0, /* special_function */ |
| 189 | "r_byte3", /* name */ |
| 190 | FALSE, /* partial_inplace */ |
| 191 | 0, /* src_mask */ |
| 192 | 0xff, /* dst_mask */ |
| 193 | FALSE), /* pcrel_offset */ |
| 194 | |
| 195 | BFD_HOWTO (BFD_RELOC_Z80_WORD0, |
| 196 | R_WORD0, /* type */ |
| 197 | 0, /* rightshift */ |
| 198 | 0, /* size (0 = byte, 1 = short, 2 = long) */ |
| 199 | 16, /* bitsize */ |
| 200 | FALSE, /* pc_relative */ |
| 201 | 0, /* bitpos */ |
| 202 | complain_overflow_dont, /* complain_on_overflow */ |
| 203 | 0, /* special_function */ |
| 204 | "r_word0", /* name */ |
| 205 | FALSE, /* partial_inplace */ |
| 206 | 0, /* src_mask */ |
| 207 | 0xffff, /* dst_mask */ |
| 208 | FALSE), /* pcrel_offset */ |
| 209 | |
| 210 | BFD_HOWTO (BFD_RELOC_Z80_WORD1, |
| 211 | R_WORD1, /* type */ |
| 212 | 16, /* rightshift */ |
| 213 | 0, /* size (0 = byte, 1 = short, 2 = long) */ |
| 214 | 16, /* bitsize */ |
| 215 | FALSE, /* pc_relative */ |
| 216 | 0, /* bitpos */ |
| 217 | complain_overflow_dont, /* complain_on_overflow */ |
| 218 | 0, /* special_function */ |
| 219 | "r_word1", /* name */ |
| 220 | FALSE, /* partial_inplace */ |
| 221 | 0, /* src_mask */ |
| 222 | 0xffff, /* dst_mask */ |
| 223 | FALSE), /* pcrel_offset */ |
| 224 | |
| 225 | BFD_HOWTO (BFD_RELOC_Z80_16_BE, |
| 226 | R_IMM16BE, /* type */ |
| 227 | 0, /* rightshift */ |
| 228 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 229 | 16, /* bitsize */ |
| 230 | FALSE, /* pc_relative */ |
| 231 | 0, /* bitpos */ |
| 232 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 233 | 0, /* special_function */ |
| 234 | "r_imm16be", /* name */ |
| 235 | FALSE, /* partial_inplace */ |
| 236 | 0x0000ffff, /* src_mask */ |
| 237 | 0x0000ffff, /* dst_mask */ |
| 238 | FALSE), /* pcrel_offset */ |
| 239 | }; |
| 240 | |
| 241 | #define NUM_HOWTOS ARRAY_SIZE (howto_table) |
| 242 | |
| 243 | #define BADMAG(x) Z80BADMAG(x) |
| 244 | #define Z80 1 /* Customize coffcode.h. */ |
| 245 | #define __A_MAGIC_SET__ |
| 246 | |
| 247 | /* Code to swap in the reloc. */ |
| 248 | |
| 249 | #define SWAP_IN_RELOC_OFFSET H_GET_32 |
| 250 | #define SWAP_OUT_RELOC_OFFSET H_PUT_32 |
| 251 | |
| 252 | #define SWAP_OUT_RELOC_EXTRA(abfd, src, dst) \ |
| 253 | dst->r_stuff[0] = 'S'; \ |
| 254 | dst->r_stuff[1] = 'C'; |
| 255 | |
| 256 | /* Code to turn a r_type into a howto ptr, uses the above howto table. */ |
| 257 | static void |
| 258 | rtype2howto (arelent *internal, struct internal_reloc *dst) |
| 259 | { |
| 260 | unsigned i; |
| 261 | for (i = 0; i < NUM_HOWTOS; i++) |
| 262 | { |
| 263 | if (howto_table[i].howto.type == dst->r_type) |
| 264 | { |
| 265 | internal->howto = &howto_table[i].howto; |
| 266 | return; |
| 267 | } |
| 268 | } |
| 269 | internal->howto = NULL; |
| 270 | } |
| 271 | |
| 272 | #define RTYPE2HOWTO(internal, relocentry) rtype2howto (internal, relocentry) |
| 273 | |
| 274 | static reloc_howto_type * |
| 275 | coff_z80_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED, |
| 276 | bfd_reloc_code_real_type code) |
| 277 | { |
| 278 | unsigned i; |
| 279 | for (i = 0; i < NUM_HOWTOS; i++) |
| 280 | if (howto_table[i].r_type == code) |
| 281 | return &howto_table[i].howto; |
| 282 | |
| 283 | BFD_FAIL (); |
| 284 | return NULL; |
| 285 | } |
| 286 | |
| 287 | static reloc_howto_type * |
| 288 | coff_z80_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, |
| 289 | const char *r_name) |
| 290 | { |
| 291 | unsigned i; |
| 292 | for (i = 0; i < NUM_HOWTOS; i++) |
| 293 | if (strcasecmp(howto_table[i].howto.name, r_name) == 0) |
| 294 | return &howto_table[i].howto; |
| 295 | |
| 296 | return NULL; |
| 297 | } |
| 298 | |
| 299 | /* Perform any necessary magic to the addend in a reloc entry. */ |
| 300 | |
| 301 | #define CALC_ADDEND(abfd, symbol, ext_reloc, cache_ptr) \ |
| 302 | cache_ptr->addend = ext_reloc.r_offset; |
| 303 | |
| 304 | #define RELOC_PROCESSING(relent,reloc,symbols,abfd,section) \ |
| 305 | reloc_processing(relent, reloc, symbols, abfd, section) |
| 306 | |
| 307 | static void |
| 308 | reloc_processing (arelent *relent, |
| 309 | struct internal_reloc *reloc, |
| 310 | asymbol **symbols, |
| 311 | bfd *abfd, |
| 312 | asection *section) |
| 313 | { |
| 314 | relent->address = reloc->r_vaddr; |
| 315 | rtype2howto (relent, reloc); |
| 316 | |
| 317 | if (reloc->r_symndx > 0) |
| 318 | relent->sym_ptr_ptr = symbols + obj_convert (abfd)[reloc->r_symndx]; |
| 319 | else |
| 320 | relent->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr; |
| 321 | |
| 322 | relent->addend = reloc->r_offset; |
| 323 | relent->address -= section->vma; |
| 324 | } |
| 325 | |
| 326 | static void |
| 327 | extra_case (bfd *in_abfd, |
| 328 | struct bfd_link_info *link_info, |
| 329 | struct bfd_link_order *link_order, |
| 330 | arelent *reloc, |
| 331 | bfd_byte *data, |
| 332 | unsigned int *src_ptr, |
| 333 | unsigned int *dst_ptr) |
| 334 | { |
| 335 | asection * input_section = link_order->u.indirect.section; |
| 336 | int val = bfd_coff_reloc16_get_value (reloc, link_info, input_section); |
| 337 | |
| 338 | switch (reloc->howto->type) |
| 339 | { |
| 340 | case R_OFF8: |
| 341 | if (reloc->howto->partial_inplace) |
| 342 | val += (signed char)(bfd_get_8 ( in_abfd, data+*src_ptr) |
| 343 | & reloc->howto->src_mask); |
| 344 | if (val>127 || val<-128) /* Test for overflow. */ |
| 345 | (*link_info->callbacks->reloc_overflow) |
| 346 | (link_info, NULL, bfd_asymbol_name (*reloc->sym_ptr_ptr), |
| 347 | reloc->howto->name, reloc->addend, input_section->owner, |
| 348 | input_section, reloc->address); |
| 349 | |
| 350 | bfd_put_8 (in_abfd, val, data + *dst_ptr); |
| 351 | (*dst_ptr) += 1; |
| 352 | (*src_ptr) += 1; |
| 353 | break; |
| 354 | |
| 355 | case R_BYTE3: |
| 356 | bfd_put_8 (in_abfd, val >> 24, data + *dst_ptr); |
| 357 | (*dst_ptr) += 1; |
| 358 | (*src_ptr) += 1; |
| 359 | break; |
| 360 | |
| 361 | case R_BYTE2: |
| 362 | bfd_put_8 (in_abfd, val >> 16, data + *dst_ptr); |
| 363 | (*dst_ptr) += 1; |
| 364 | (*src_ptr) += 1; |
| 365 | break; |
| 366 | |
| 367 | case R_BYTE1: |
| 368 | bfd_put_8 (in_abfd, val >> 8, data + *dst_ptr); |
| 369 | (*dst_ptr) += 1; |
| 370 | (*src_ptr) += 1; |
| 371 | break; |
| 372 | |
| 373 | case R_IMM8: |
| 374 | if (reloc->howto->partial_inplace) |
| 375 | val += bfd_get_8 ( in_abfd, data+*src_ptr) & reloc->howto->src_mask; |
| 376 | //fallthrough |
| 377 | case R_BYTE0: |
| 378 | bfd_put_8 (in_abfd, val, data + *dst_ptr); |
| 379 | (*dst_ptr) += 1; |
| 380 | (*src_ptr) += 1; |
| 381 | break; |
| 382 | |
| 383 | case R_WORD1: |
| 384 | bfd_put_16 (in_abfd, val >> 16, data + *dst_ptr); |
| 385 | (*dst_ptr) += 2; |
| 386 | (*src_ptr) += 2; |
| 387 | break; |
| 388 | |
| 389 | case R_IMM16: |
| 390 | if (reloc->howto->partial_inplace) |
| 391 | val += bfd_get_16 ( in_abfd, data+*src_ptr) & reloc->howto->src_mask; |
| 392 | //fallthrough |
| 393 | case R_WORD0: |
| 394 | bfd_put_16 (in_abfd, val, data + *dst_ptr); |
| 395 | (*dst_ptr) += 2; |
| 396 | (*src_ptr) += 2; |
| 397 | break; |
| 398 | |
| 399 | case R_IMM24: |
| 400 | if (reloc->howto->partial_inplace) |
| 401 | val += (bfd_get_16 ( in_abfd, data+*src_ptr) |
| 402 | + (bfd_get_8 ( in_abfd, data+*src_ptr+2) << 16)) |
| 403 | & reloc->howto->src_mask; |
| 404 | bfd_put_16 (in_abfd, val, data + *dst_ptr); |
| 405 | bfd_put_8 (in_abfd, val >> 16, data + *dst_ptr+2); |
| 406 | (*dst_ptr) += 3; |
| 407 | (*src_ptr) += 3; |
| 408 | break; |
| 409 | |
| 410 | case R_IMM32: |
| 411 | if (reloc->howto->partial_inplace) |
| 412 | val += bfd_get_32 ( in_abfd, data+*src_ptr) & reloc->howto->src_mask; |
| 413 | bfd_put_32 (in_abfd, val, data + *dst_ptr); |
| 414 | (*dst_ptr) += 4; |
| 415 | (*src_ptr) += 4; |
| 416 | break; |
| 417 | |
| 418 | case R_JR: |
| 419 | { |
| 420 | if (reloc->howto->partial_inplace) |
| 421 | val += (signed char)(bfd_get_8 ( in_abfd, data+*src_ptr) |
| 422 | & reloc->howto->src_mask); |
| 423 | bfd_vma dot = (*dst_ptr |
| 424 | + input_section->output_offset |
| 425 | + input_section->output_section->vma); |
| 426 | int gap = val - dot; |
| 427 | if (gap >= 128 || gap < -128) |
| 428 | (*link_info->callbacks->reloc_overflow) |
| 429 | (link_info, NULL, bfd_asymbol_name (*reloc->sym_ptr_ptr), |
| 430 | reloc->howto->name, reloc->addend, input_section->owner, |
| 431 | input_section, reloc->address); |
| 432 | |
| 433 | bfd_put_8 (in_abfd, gap, data + *dst_ptr); |
| 434 | (*dst_ptr)++; |
| 435 | (*src_ptr)++; |
| 436 | break; |
| 437 | } |
| 438 | |
| 439 | case R_IMM16BE: |
| 440 | if (reloc->howto->partial_inplace) |
| 441 | val += (bfd_get_8 ( in_abfd, data+*src_ptr+0) * 0x100 + |
| 442 | bfd_get_8 ( in_abfd, data+*src_ptr+1)) & reloc->howto->src_mask; |
| 443 | |
| 444 | bfd_put_8 (in_abfd, val >> 8, data + *dst_ptr+0); |
| 445 | bfd_put_8 (in_abfd, val, data + *dst_ptr+1); |
| 446 | (*dst_ptr) += 2; |
| 447 | (*src_ptr) += 2; |
| 448 | break; |
| 449 | |
| 450 | default: |
| 451 | abort (); |
| 452 | } |
| 453 | } |
| 454 | |
| 455 | static int |
| 456 | z80_is_local_label_name (bfd * abfd ATTRIBUTE_UNUSED, |
| 457 | const char * name) |
| 458 | { |
| 459 | return (name[0] == '.' && name[1] == 'L') || |
| 460 | _bfd_coff_is_local_label_name (abfd, name); |
| 461 | } |
| 462 | |
| 463 | #define coff_bfd_is_local_label_name z80_is_local_label_name |
| 464 | |
| 465 | #define coff_reloc16_extra_cases extra_case |
| 466 | #define coff_bfd_reloc_type_lookup coff_z80_reloc_type_lookup |
| 467 | #define coff_bfd_reloc_name_lookup coff_z80_reloc_name_lookup |
| 468 | |
| 469 | #ifndef bfd_pe_print_pdata |
| 470 | #define bfd_pe_print_pdata NULL |
| 471 | #endif |
| 472 | |
| 473 | #include "coffcode.h" |
| 474 | |
| 475 | #undef coff_bfd_get_relocated_section_contents |
| 476 | #define coff_bfd_get_relocated_section_contents \ |
| 477 | bfd_coff_reloc16_get_relocated_section_contents |
| 478 | |
| 479 | #undef coff_bfd_relax_section |
| 480 | #define coff_bfd_relax_section bfd_coff_reloc16_relax_section |
| 481 | |
| 482 | CREATE_LITTLE_COFF_TARGET_VEC (z80_coff_vec, "coff-z80", 0, |
| 483 | SEC_CODE | SEC_DATA, '\0', NULL, |
| 484 | COFF_SWAP_TABLE) |
| 485 | |