1 /* BFD back-end for National Semiconductor's CR16C ELF 2 Copyright (C) 2004-2016 Free Software Foundation, Inc. 3 4 This file is part of BFD, the Binary File Descriptor library. 5 6 This program is free software; you can redistribute it and/or modify 7 it under the terms of the GNU General Public License as published by 8 the Free Software Foundation; either version 3 of the License, or 9 (at your option) any later version. 10 11 This program is distributed in the hope that it will be useful, 12 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 GNU General Public License for more details. 15 16 You should have received a copy of the GNU General Public License 17 along with this program; if not, write to the Free Software 18 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, 19 MA 02110-1301, USA. */ 20 21 #include "sysdep.h" 22 #include "bfd.h" 23 #include "libbfd.h" 24 #include "bfdlink.h" 25 #include "elf/cr16c.h" 26 #include "elf-bfd.h" 27 28 29 #define USE_REL 1 /* CR16C uses REL relocations instead of RELA. */ 30 31 /* The following definition is based on EMPTY_HOWTO macro, 32 but also initiates the "name" field in HOWTO struct. */ 33 #define ONLY_NAME_HOWTO(C) \ 34 HOWTO ((C), 0, 0, 0, FALSE, 0, complain_overflow_dont, NULL, \ 35 STRINGX(C), FALSE, 0, 0, FALSE) 36 37 /* reloc_map_index array maps CRASM relocation type into a BFD 38 relocation enum. The array's indices are synchronized with 39 RINDEX_16C_* indices, created in include/elf/cr16c.h. 40 The array is used in: 41 1. elf32-cr16c.c : elf_cr16c_reloc_type_lookup(). 42 2. asreloc.c : find_reloc_type(). */ 43 44 RELOC_MAP reloc_map_index[RINDEX_16C_MAX] = 45 { 46 {R_16C_NUM08, BFD_RELOC_16C_NUM08}, 47 {R_16C_NUM08_C, BFD_RELOC_16C_NUM08_C}, 48 {R_16C_NUM16, BFD_RELOC_16C_NUM16}, 49 {R_16C_NUM16_C, BFD_RELOC_16C_NUM16_C}, 50 {R_16C_NUM32, BFD_RELOC_16C_NUM32}, 51 {R_16C_NUM32_C, BFD_RELOC_16C_NUM32_C}, 52 {R_16C_DISP04, BFD_RELOC_16C_DISP04}, 53 {R_16C_DISP04_C, BFD_RELOC_16C_DISP04_C}, 54 {R_16C_DISP08, BFD_RELOC_16C_DISP08}, 55 {R_16C_DISP08_C, BFD_RELOC_16C_DISP08_C}, 56 {R_16C_DISP16, BFD_RELOC_16C_DISP16}, 57 {R_16C_DISP16_C, BFD_RELOC_16C_DISP16_C}, 58 {R_16C_DISP24, BFD_RELOC_16C_DISP24}, 59 {R_16C_DISP24_C, BFD_RELOC_16C_DISP24_C}, 60 {R_16C_DISP24a, BFD_RELOC_16C_DISP24a}, 61 {R_16C_DISP24a_C, BFD_RELOC_16C_DISP24a_C}, 62 {R_16C_REG04, BFD_RELOC_16C_REG04}, 63 {R_16C_REG04_C, BFD_RELOC_16C_REG04_C}, 64 {R_16C_REG04a, BFD_RELOC_16C_REG04a}, 65 {R_16C_REG04a_C, BFD_RELOC_16C_REG04a_C}, 66 {R_16C_REG14, BFD_RELOC_16C_REG14}, 67 {R_16C_REG14_C, BFD_RELOC_16C_REG14_C}, 68 {R_16C_REG16, BFD_RELOC_16C_REG16}, 69 {R_16C_REG16_C, BFD_RELOC_16C_REG16_C}, 70 {R_16C_REG20, BFD_RELOC_16C_REG20}, 71 {R_16C_REG20_C, BFD_RELOC_16C_REG20_C}, 72 {R_16C_ABS20, BFD_RELOC_16C_ABS20}, 73 {R_16C_ABS20_C, BFD_RELOC_16C_ABS20_C}, 74 {R_16C_ABS24, BFD_RELOC_16C_ABS24}, 75 {R_16C_ABS24_C, BFD_RELOC_16C_ABS24_C}, 76 {R_16C_IMM04, BFD_RELOC_16C_IMM04}, 77 {R_16C_IMM04_C, BFD_RELOC_16C_IMM04_C}, 78 {R_16C_IMM16, BFD_RELOC_16C_IMM16}, 79 {R_16C_IMM16_C, BFD_RELOC_16C_IMM16_C}, 80 {R_16C_IMM20, BFD_RELOC_16C_IMM20}, 81 {R_16C_IMM20_C, BFD_RELOC_16C_IMM20_C}, 82 {R_16C_IMM24, BFD_RELOC_16C_IMM24}, 83 {R_16C_IMM24_C, BFD_RELOC_16C_IMM24_C}, 84 {R_16C_IMM32, BFD_RELOC_16C_IMM32}, 85 {R_16C_IMM32_C, BFD_RELOC_16C_IMM32_C} 86 }; 87 88 static reloc_howto_type elf_howto_table[] = 89 { 90 /* 00 */ ONLY_NAME_HOWTO (RINDEX_16C_NUM08), 91 /* 01 */ ONLY_NAME_HOWTO (RINDEX_16C_NUM08_C), 92 /* 02 */ ONLY_NAME_HOWTO (RINDEX_16C_NUM16), 93 /* 03 */ ONLY_NAME_HOWTO (RINDEX_16C_NUM16_C), 94 /* 04 */ ONLY_NAME_HOWTO (RINDEX_16C_NUM32), 95 /* 05 */ ONLY_NAME_HOWTO (RINDEX_16C_NUM32_C), 96 /* 06 */ ONLY_NAME_HOWTO (RINDEX_16C_DISP04), 97 /* 07 */ ONLY_NAME_HOWTO (RINDEX_16C_DISP04_C), 98 /* 08 */ ONLY_NAME_HOWTO (RINDEX_16C_DISP08), 99 /* 09 */ ONLY_NAME_HOWTO (RINDEX_16C_DISP08_C), 100 /* 10 */ ONLY_NAME_HOWTO (RINDEX_16C_DISP16), 101 /* 11 */ ONLY_NAME_HOWTO (RINDEX_16C_DISP16_C), 102 /* 12 */ ONLY_NAME_HOWTO (RINDEX_16C_DISP24), 103 /* 13 */ ONLY_NAME_HOWTO (RINDEX_16C_DISP24_C), 104 /* 14 */ ONLY_NAME_HOWTO (RINDEX_16C_DISP24a), 105 /* 15 */ ONLY_NAME_HOWTO (RINDEX_16C_DISP24a_C), 106 /* 16 */ ONLY_NAME_HOWTO (RINDEX_16C_REG04), 107 /* 17 */ ONLY_NAME_HOWTO (RINDEX_16C_REG04_C), 108 /* 18 */ ONLY_NAME_HOWTO (RINDEX_16C_REG04a), 109 /* 19 */ ONLY_NAME_HOWTO (RINDEX_16C_REG04a_C), 110 /* 20 */ ONLY_NAME_HOWTO (RINDEX_16C_REG14), 111 /* 21 */ ONLY_NAME_HOWTO (RINDEX_16C_REG14_C), 112 /* 22 */ ONLY_NAME_HOWTO (RINDEX_16C_REG16), 113 /* 23 */ ONLY_NAME_HOWTO (RINDEX_16C_REG16_C), 114 /* 24 */ ONLY_NAME_HOWTO (RINDEX_16C_REG20), 115 /* 25 */ ONLY_NAME_HOWTO (RINDEX_16C_REG20_C), 116 /* 26 */ ONLY_NAME_HOWTO (RINDEX_16C_ABS20), 117 /* 27 */ ONLY_NAME_HOWTO (RINDEX_16C_ABS20_C), 118 /* 28 */ ONLY_NAME_HOWTO (RINDEX_16C_ABS24), 119 /* 29 */ ONLY_NAME_HOWTO (RINDEX_16C_ABS24_C), 120 /* 30 */ ONLY_NAME_HOWTO (RINDEX_16C_IMM04), 121 /* 31 */ ONLY_NAME_HOWTO (RINDEX_16C_IMM04_C), 122 /* 32 */ ONLY_NAME_HOWTO (RINDEX_16C_IMM16), 123 /* 33 */ ONLY_NAME_HOWTO (RINDEX_16C_IMM16_C), 124 /* 34 */ ONLY_NAME_HOWTO (RINDEX_16C_IMM20), 125 /* 35 */ ONLY_NAME_HOWTO (RINDEX_16C_IMM20_C), 126 /* 36 */ ONLY_NAME_HOWTO (RINDEX_16C_IMM24), 127 /* 37 */ ONLY_NAME_HOWTO (RINDEX_16C_IMM24_C), 128 /* 38 */ ONLY_NAME_HOWTO (RINDEX_16C_IMM32), 129 /* 39 */ ONLY_NAME_HOWTO (RINDEX_16C_IMM32_C) 130 }; 131 132 133 /* Code to turn a code_type into a howto ptr, uses the above howto table. */ 134 135 static reloc_howto_type * 136 elf_cr16c_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED, 137 bfd_reloc_code_real_type code) 138 { 139 unsigned int i; 140 141 for (i = 0; i < RINDEX_16C_MAX; i++) 142 { 143 if (code == reloc_map_index[i].bfd_reloc_enum) 144 { 145 /* printf ("CR16C Relocation Type is - %x\n", code); */ 146 return & elf_howto_table[i]; 147 } 148 } 149 150 /* printf ("This relocation Type is not supported - %x\n", code); */ 151 return 0; 152 } 153 154 static reloc_howto_type * 155 elf_cr16c_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, 156 const char *r_name) 157 { 158 unsigned int i; 159 160 for (i = 0; i < sizeof (elf_howto_table) / sizeof (elf_howto_table[0]); i++) 161 if (elf_howto_table[i].name != NULL 162 && strcasecmp (elf_howto_table[i].name, r_name) == 0) 163 return &elf_howto_table[i]; 164 165 return NULL; 166 } 167 168 static void 169 elf_cr16c_info_to_howto (bfd *abfd ATTRIBUTE_UNUSED, 170 arelent *cache_ptr ATTRIBUTE_UNUSED, 171 Elf_Internal_Rela *dst ATTRIBUTE_UNUSED) 172 { 173 abort (); 174 } 175 176 static void 177 elf_cr16c_info_to_howto_rel (bfd *abfd ATTRIBUTE_UNUSED, 178 arelent *cache_ptr, 179 Elf_Internal_Rela *dst) 180 { 181 unsigned int r_type = ELF32_R_TYPE (dst->r_info); 182 183 if (r_type >= RINDEX_16C_MAX) 184 { 185 _bfd_error_handler (_("%B: invalid CR16C reloc number: %d"), abfd, r_type); 186 r_type = 0; 187 } 188 cache_ptr->howto = &elf_howto_table[r_type]; 189 } 190 191 /* Perform a relocation as part of a final link. */ 192 193 static bfd_reloc_status_type 194 cr16c_elf_final_link_relocate (reloc_howto_type *howto, 195 bfd *abfd, 196 bfd *output_bfd ATTRIBUTE_UNUSED, 197 asection *input_section, 198 bfd_byte *data, 199 bfd_vma octets, 200 bfd_vma Rvalue, 201 bfd_vma addend ATTRIBUTE_UNUSED, 202 struct bfd_link_info *info ATTRIBUTE_UNUSED, 203 asection *sym_sec ATTRIBUTE_UNUSED, 204 int is_local ATTRIBUTE_UNUSED) 205 { 206 long value; 207 short sword; /* Extracted from the hole and put back. */ 208 unsigned long format, addr_type, code_factor; 209 unsigned short size; 210 unsigned short r_type; 211 212 unsigned long disp20_opcod; 213 char neg = 0; 214 char neg2pos = 0; 215 216 long left_val = 0; 217 long plus_factor = 0; /* To be added to the hole. */ 218 219 #define MIN_BYTE ((int) 0xFFFFFF80) 220 #define MIN_WORD ((int) 0xFFFF8000) 221 #define MAX_UWORD ((unsigned) 0x0000FFFF) 222 #define MAX_UBYTE ((unsigned) 0x000000FF) 223 224 r_type = reloc_map_index[howto->type].cr_reloc_type; 225 format = r_type & R_FORMAT; 226 size = r_type & R_SIZESP; 227 addr_type = r_type & R_ADDRTYPE; 228 code_factor = ((addr_type == R_CODE_ADDR) ? 1 : 0); 229 230 switch (format) 231 { 232 case R_NUMBER: 233 switch (size) 234 { 235 case R_S_16C_08: /* One byte. */ 236 value = bfd_get_8 (abfd, (char *) data + octets); 237 break; 238 case R_S_16C_16: /* Two bytes. */ 239 sword = bfd_get_16 (abfd, (bfd_byte *) data + octets); 240 value = sword; 241 break; 242 case R_S_16C_32: /* Four bytes. */ 243 value = bfd_get_32 (abfd, (bfd_byte *) data + octets); 244 break; 245 default: 246 return bfd_reloc_notsupported; 247 } 248 break; 249 250 case R_16C_DISPL: 251 switch (size) 252 { 253 case R_S_16C_04: /* word1(4-7). */ 254 value = bfd_get_8 (abfd, (char *) data + octets); 255 left_val = value & 0xF; 256 value = (value & 0xF0) >> 4; 257 value++; 258 value <<= 1; 259 break; 260 case R_S_16C_08: /* word1(0-3,8-11). */ 261 sword = bfd_get_16 (abfd, (char *) data + octets); 262 value = sword & 0x000F; 263 value |= ((sword & 0x0F00) >> 4); 264 left_val = sword & 0xF0F0; 265 value <<= 1; 266 if (value & 0x100) 267 value |= 0xFFFFFF00; 268 break; 269 case R_S_16C_16: /* word2. */ 270 sword = bfd_get_16 (abfd, (bfd_byte *) data + octets); 271 value = sword; 272 value = ((value & 0xFFFE) >> 1) | ((value & 0x1) << 15); 273 value <<= 1; 274 if (value & 0x10000) 275 value |= 0xFFFF0000; 276 break; 277 case R_S_16C_24_a: /* word1(0-7),word2. */ 278 value = bfd_get_32 (abfd, (bfd_byte *) data + octets); 279 left_val = value & 0x0000FF00; 280 value = ((value & 0xFFFE0000) >> 17) | 281 ((value & 0x00010000) << 7) | ((value & 0x000000FF) << 15); 282 value <<= 1; 283 if (value & 0x1000000) 284 value |= 0xFE000000; 285 break; 286 case R_S_16C_24: /* word2(0-3,8-11),word3. */ 287 value = bfd_get_32 (abfd, (bfd_byte *) data + octets); 288 left_val = value & 0x0000F0F0; 289 value = ((value >> 16) & 0x0000FFFF) | 290 ((value & 0x00000F00) << 8) | ((value & 0x0000000F) << 20); 291 292 value = ((value & 0x00FFFFFE) >> 1) | ((value & 0x00000001) << 23); 293 294 value <<= 1; 295 if (value & 0x1000000) 296 value |= 0xFE000000; 297 break; 298 default: 299 return bfd_reloc_notsupported; 300 } 301 break; 302 303 case R_16C_REGREL: 304 switch (size) 305 { 306 case R_S_16C_04: /* word1(12-15) not scaled. */ 307 value = bfd_get_8 (abfd, (char *) data + octets); 308 left_val = value & 0xF0; 309 value = value & 0xF; 310 break; 311 case R_S_16C_04_a: /* word1(12-15) scaled by 2. */ 312 value = bfd_get_8 (abfd, (char *) data + octets); 313 left_val = value & 0xF0; 314 value = value & 0xF; 315 value <<= 1; 316 break; 317 case R_S_16C_14: /* word1(4-5),word2(0-3,8-15). */ 318 value = bfd_get_32 (abfd, (bfd_byte *) data + octets); 319 left_val = value & 0x00F0FFCF; 320 value = ((value & 0xc0000000) >> 24) | 321 ((value & 0x3F000000) >> 16) | 322 ((value & 0x000F0000) >> 16) | (value & 0x00000030); 323 break; 324 case R_S_16C_16: /* word2. */ 325 sword = bfd_get_16 (abfd, (bfd_byte *) data + octets); 326 value = sword; 327 break; 328 case R_S_16C_20: /* word2(8-11),word3. */ 329 value = bfd_get_32 (abfd, (bfd_byte *) data + octets); 330 left_val = value & 0xF0; 331 value = (value & 0xF) << 16; 332 sword = bfd_get_16 (abfd, (bfd_byte *) data + octets + 1); 333 value = value | (unsigned short) sword; 334 disp20_opcod = bfd_get_32 (abfd, (bfd_byte *) data + octets - 3); 335 disp20_opcod |= 0x0FFF0000; 336 if ((disp20_opcod == 0x4FFF0018) || /* loadb -disp20(reg) */ 337 (disp20_opcod == 0x5FFF0018) || /* loadb -disp20(rp) */ 338 (disp20_opcod == 0x8FFF0018) || /* loadd -disp20(reg) */ 339 (disp20_opcod == 0x9FFF0018) || /* loadd -disp20(rp) */ 340 (disp20_opcod == 0xCFFF0018) || /* loadw -disp20(reg) */ 341 (disp20_opcod == 0xDFFF0018) || /* loadw -disp20(rp) */ 342 (disp20_opcod == 0x4FFF0019) || /* storb -disp20(reg) */ 343 (disp20_opcod == 0x5FFF0019) || /* storb -disp20(rp) */ 344 (disp20_opcod == 0x8FFF0019) || /* stord -disp20(reg) */ 345 (disp20_opcod == 0x9FFF0019) || /* stord -disp20(rp) */ 346 (disp20_opcod == 0xCFFF0019) || /* storw -disp20(reg) */ 347 (disp20_opcod == 0xDFFF0019)) 348 { /* storw -disp20(rp). */ 349 neg = 1; 350 value |= 0xFFF00000; 351 } 352 353 break; 354 default: 355 return bfd_reloc_notsupported; 356 } 357 break; 358 359 case R_16C_ABS: 360 switch (size) 361 { 362 case R_S_16C_20: /* word1(0-3),word2. */ 363 value = bfd_get_32 (abfd, (bfd_byte *) data + octets); 364 left_val = value & 0x0000FFF0; 365 value = ((value & 0xFFFF0000) >> 16) | 366 ((value & 0x0000000F) << 16); 367 break; 368 case R_S_16C_24: /* word2(0-3,8-11),word3. */ 369 value = bfd_get_32 (abfd, (bfd_byte *) data + octets); 370 left_val = value & 0x0000F0F0; 371 value = ((value & 0xFFFF0000) >> 16) | 372 ((value & 0x00000F00) << 8) | ((value & 0x0000000F) << 20); 373 break; 374 default: 375 return bfd_reloc_notsupported; 376 } 377 break; 378 379 case R_16C_IMMED: 380 switch (size) 381 { 382 case R_S_16C_04: /* word1/2(4-7). */ 383 value = bfd_get_8 (abfd, (char *) data + octets); 384 left_val = value & 0xF; 385 value = (value & 0xF0) >> 4; 386 break; 387 case R_S_16C_16: /* word2. */ 388 sword = bfd_get_16 (abfd, (bfd_byte *) data + octets); 389 value = sword; 390 break; 391 case R_S_16C_20: /* word1(0-3),word2. */ 392 value = bfd_get_32 (abfd, (bfd_byte *) data + octets); 393 left_val = value & 0x0000FFF0; 394 value = ((value & 0xFFFF0000) >> 16) | 395 ((value & 0x0000000F) << 16); 396 break; 397 case R_S_16C_32: /* word2, word3. */ 398 value = bfd_get_32 (abfd, (bfd_byte *) data + octets); 399 value = ((value & 0x0000FFFF) << 16) | 400 ((value & 0xFFFF0000) >> 16); 401 break; 402 default: 403 return bfd_reloc_notsupported; 404 } 405 break; 406 default: 407 return bfd_reloc_notsupported; 408 } 409 410 switch ((r_type & R_RELTO) >> 4) 411 { 412 413 case 0: /* R_ABS. */ 414 plus_factor = Rvalue; 415 break; 416 case 1: /* R_PCREL. */ 417 plus_factor = Rvalue - 418 (input_section->output_section->vma + input_section->output_offset); 419 break; 420 default: 421 return bfd_reloc_notsupported; 422 } 423 424 if (neg) 425 { 426 if (plus_factor >= -value) 427 neg2pos = 1; 428 /* We need to change load/stor with negative 429 displ opcode to positive disp opcode (CR16C). */ 430 } 431 432 value = value + (plus_factor >> code_factor); 433 434 switch (format) 435 { 436 case R_NUMBER: 437 switch (size) 438 { 439 case R_S_16C_08: /* One byte. */ 440 if (value > (int) MAX_UBYTE || value < MIN_BYTE) 441 return bfd_reloc_overflow; 442 value &= 0xFF; 443 bfd_put_8 (abfd, (bfd_vma) value, (unsigned char *) data + octets); 444 break; 445 446 case R_S_16C_16: /* Two bytes. */ 447 if (value > (int) MAX_UWORD || value < MIN_WORD) 448 return bfd_reloc_overflow; 449 value &= 0xFFFF; 450 sword = value; 451 bfd_put_16 (abfd, (bfd_vma) sword, 452 (unsigned char *) data + octets); 453 break; 454 455 case R_S_16C_32: /* Four bytes. */ 456 value &= 0xFFFFFFFF; 457 bfd_put_32 (abfd, (bfd_vma) value, (bfd_byte *) data + octets); 458 break; 459 460 default: 461 return bfd_reloc_notsupported; 462 } 463 break; 464 465 case R_16C_DISPL: 466 switch (size) 467 { 468 case R_S_16C_04: /* word1(4-7). */ 469 if ((value - 32) > 32 || value < 2) 470 return bfd_reloc_overflow; 471 value >>= 1; 472 value--; 473 value &= 0xF; 474 value <<= 4; 475 value |= left_val; 476 bfd_put_8 (abfd, (bfd_vma) value, (unsigned char *) data + octets); 477 break; 478 479 case R_S_16C_08: /* word1(0-3,8-11). */ 480 if (value > 255 || value < -256 || value == 0x80) 481 return bfd_reloc_overflow; 482 value &= 0x1FF; 483 value >>= 1; 484 sword = value & 0x000F; 485 sword |= (value & 0x00F0) << 4; 486 sword |= left_val; 487 bfd_put_16 (abfd, (bfd_vma) sword, 488 (unsigned char *) data + octets); 489 break; 490 491 case R_S_16C_16: /* word2. */ 492 if (value > 65535 || value < -65536) 493 return bfd_reloc_overflow; 494 value >>= 1; 495 value &= 0xFFFF; 496 value = ((value & 0x8000) >> 15) | ((value & 0x7FFF) << 1); 497 sword = value; 498 bfd_put_16 (abfd, (bfd_vma) sword, 499 (unsigned char *) data + octets); 500 break; 501 502 case R_S_16C_24_a: /* word1(0-7),word2. */ 503 if (value > 16777215 || value < -16777216) 504 return bfd_reloc_overflow; 505 value &= 0x1FFFFFF; 506 value >>= 1; 507 value = ((value & 0x00007FFF) << 17) | 508 ((value & 0x00800000) >> 7) | ((value & 0x007F8000) >> 15); 509 value |= left_val; 510 bfd_put_32 (abfd, (bfd_vma) value, (bfd_byte *) data + octets); 511 break; 512 513 case R_S_16C_24: /* word2(0-3,8-11),word3. */ 514 if (value > 16777215 || value < -16777216) 515 return bfd_reloc_overflow; 516 value &= 0x1FFFFFF; 517 value >>= 1; 518 519 value = ((value & 0x007FFFFF) << 1) | ((value & 0x00800000) >> 23); 520 521 value = ((value & 0x0000FFFF) << 16) | 522 ((value & 0x000F0000) >> 8) | ((value & 0x00F00000) >> 20); 523 value |= left_val; 524 bfd_put_32 (abfd, (bfd_vma) value, (bfd_byte *) data + octets); 525 break; 526 527 default: 528 return bfd_reloc_notsupported; 529 } 530 break; 531 532 case R_16C_REGREL: 533 switch (size) 534 { 535 case R_S_16C_04: /* word1(12-15) not scaled. */ 536 if (value > 13 || value < 0) 537 return bfd_reloc_overflow; 538 value &= 0xF; 539 value |= left_val; 540 bfd_put_8 (abfd, (bfd_vma) value, (unsigned char *) data + octets); 541 break; 542 543 case R_S_16C_04_a: /* word1(12-15) not scaled. */ 544 if (value > 26 || value < 0) 545 return bfd_reloc_overflow; 546 value &= 0x1F; 547 value >>= 1; 548 value |= left_val; 549 bfd_put_8 (abfd, (bfd_vma) value, (unsigned char *) data + octets); 550 break; 551 552 case R_S_16C_14: /* word1(4-5),word2(0-3,8-15). */ 553 if (value < 0 || value > 16383) 554 return bfd_reloc_overflow; 555 value &= 0x3FFF; 556 value = ((value & 0x000000c0) << 24) | 557 ((value & 0x00003F00) << 16) | 558 ((value & 0x0000000F) << 16) | (value & 0x00000030); 559 value |= left_val; 560 bfd_put_32 (abfd, (bfd_vma) value, (bfd_byte *) data + octets); 561 break; 562 563 case R_S_16C_16: /* word2. */ 564 if (value > 65535 || value < 0) 565 return bfd_reloc_overflow; 566 value &= 0xFFFF; 567 sword = value; 568 bfd_put_16 (abfd, (bfd_vma) sword, 569 (unsigned char *) data + octets); 570 break; 571 572 case R_S_16C_20: /* word2(8-11),word3. */ 573 /* if (value > 1048575 || value < 0) RELOC_ERROR(1); */ 574 value &= 0xFFFFF; 575 sword = value & 0x0000FFFF; 576 value = (value & 0x000F0000) >> 16; 577 value |= left_val; 578 bfd_put_8 (abfd, (bfd_vma) value, (unsigned char *) data + octets); 579 bfd_put_16 (abfd, (bfd_vma) sword, 580 (unsigned char *) data + octets + 1); 581 if (neg2pos) 582 { 583 /* Change load/stor negative displ opcode 584 to load/stor positive displ opcode. */ 585 value = bfd_get_8 (abfd, (char *) data + octets - 3); 586 value &= 0xF7; 587 value |= 0x2; 588 bfd_put_8 (abfd, (bfd_vma) value, 589 (unsigned char *) data + octets - 3); 590 } 591 break; 592 593 default: 594 return bfd_reloc_notsupported; 595 } 596 break; 597 598 case R_16C_ABS: 599 switch (size) 600 { 601 case R_S_16C_20: /* word1(0-3),word2. */ 602 if (value > 1048575 || value < 0) 603 return bfd_reloc_overflow; 604 value &= 0xFFFFF; 605 value = ((value & 0x0000FFFF) << 16) | 606 ((value & 0x000F0000) >> 16); 607 value |= left_val; 608 bfd_put_32 (abfd, (bfd_vma) value, (bfd_byte *) data + octets); 609 break; 610 611 case R_S_16C_24: /* word2(0-3,8-11),word3. */ 612 /* if (value > 16777215 || value < 0) RELOC_ERROR(1); */ 613 value &= 0xFFFFFF; 614 value = ((value & 0x0000FFFF) << 16) | 615 ((value & 0x000F0000) >> 8) | ((value & 0x00F00000) >> 20); 616 value |= left_val; 617 bfd_put_32 (abfd, (bfd_vma) value, (bfd_byte *) data + octets); 618 break; 619 620 default: 621 return bfd_reloc_notsupported; 622 } 623 break; 624 625 case R_16C_IMMED: 626 switch (size) 627 { 628 case R_S_16C_04: /* word1/2(4-7). */ 629 if (value > 15 || value < -1) 630 return bfd_reloc_overflow; 631 value &= 0xF; 632 value <<= 4; 633 value |= left_val; 634 bfd_put_8 (abfd, (bfd_vma) value, (unsigned char *) data + octets); 635 break; 636 637 case R_S_16C_16: /* word2. */ 638 if (value > 32767 || value < -32768) 639 return bfd_reloc_overflow; 640 value &= 0xFFFF; 641 sword = value; 642 bfd_put_16 (abfd, (bfd_vma) sword, 643 (unsigned char *) data + octets); 644 break; 645 646 case R_S_16C_20: /* word1(0-3),word2. */ 647 if (value > 1048575 || value < 0) 648 return bfd_reloc_overflow; 649 value &= 0xFFFFF; 650 value = ((value & 0x0000FFFF) << 16) | 651 ((value & 0x000F0000) >> 16); 652 value |= left_val; 653 bfd_put_32 (abfd, (bfd_vma) value, (bfd_byte *) data + octets); 654 break; 655 656 case R_S_16C_32: /* word2, word3. */ 657 value &= 0xFFFFFFFF; 658 value = ((value & 0x0000FFFF) << 16) | 659 ((value & 0xFFFF0000) >> 16); 660 bfd_put_32 (abfd, (bfd_vma) value, (bfd_byte *) data + octets); 661 break; 662 663 default: 664 return bfd_reloc_notsupported; 665 } 666 break; 667 default: 668 return bfd_reloc_notsupported; 669 } 670 671 return bfd_reloc_ok; 672 } 673 674 /* Relocate a CR16C ELF section. */ 675 676 static bfd_boolean 677 elf32_cr16c_relocate_section (bfd *output_bfd, 678 struct bfd_link_info *info, 679 bfd *input_bfd, 680 asection *input_section, 681 bfd_byte *contents, 682 Elf_Internal_Rela *relocs, 683 Elf_Internal_Sym *local_syms, 684 asection **local_sections) 685 { 686 Elf_Internal_Shdr *symtab_hdr; 687 struct elf_link_hash_entry **sym_hashes; 688 Elf_Internal_Rela *rel, *relend; 689 690 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; 691 sym_hashes = elf_sym_hashes (input_bfd); 692 693 rel = relocs; 694 relend = relocs + input_section->reloc_count; 695 for (; rel < relend; rel++) 696 { 697 int r_type; 698 reloc_howto_type *howto; 699 unsigned long r_symndx; 700 Elf_Internal_Sym *sym; 701 asection *sec; 702 struct elf_link_hash_entry *h; 703 bfd_vma relocation; 704 bfd_reloc_status_type r; 705 706 r_symndx = ELF32_R_SYM (rel->r_info); 707 r_type = ELF32_R_TYPE (rel->r_info); 708 howto = elf_howto_table + r_type; 709 710 h = NULL; 711 sym = NULL; 712 sec = NULL; 713 if (r_symndx < symtab_hdr->sh_info) 714 { 715 sym = local_syms + r_symndx; 716 sec = local_sections[r_symndx]; 717 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); 718 } 719 else 720 { 721 bfd_boolean unresolved_reloc, warned, ignored; 722 723 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, 724 r_symndx, symtab_hdr, sym_hashes, 725 h, sec, relocation, 726 unresolved_reloc, warned, ignored); 727 } 728 729 if (sec != NULL && discarded_section (sec)) 730 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section, 731 rel, 1, relend, howto, 0, contents); 732 733 if (bfd_link_relocatable (info)) 734 { 735 /* This is a relocatable link. We don't have to change 736 anything, unless the reloc is against a section symbol, 737 in which case we have to adjust according to where the 738 section symbol winds up in the output section. */ 739 if (sym != NULL && ELF_ST_TYPE (sym->st_info) == STT_SECTION) 740 rel->r_addend += sec->output_offset; 741 continue; 742 } 743 744 r = cr16c_elf_final_link_relocate (howto, input_bfd, output_bfd, 745 input_section, 746 contents, rel->r_offset, 747 relocation, rel->r_addend, 748 info, sec, h == NULL); 749 750 if (r != bfd_reloc_ok) 751 { 752 const char *name; 753 const char *msg = (const char *) 0; 754 755 if (h != NULL) 756 name = h->root.root.string; 757 else 758 { 759 name = (bfd_elf_string_from_elf_section 760 (input_bfd, symtab_hdr->sh_link, sym->st_name)); 761 if (name == NULL || *name == '\0') 762 name = bfd_section_name (input_bfd, sec); 763 } 764 765 switch (r) 766 { 767 case bfd_reloc_overflow: 768 (*info->callbacks->reloc_overflow) 769 (info, (h ? &h->root : NULL), name, howto->name, 770 (bfd_vma) 0, input_bfd, input_section, rel->r_offset); 771 break; 772 773 case bfd_reloc_undefined: 774 (*info->callbacks->undefined_symbol) 775 (info, name, input_bfd, input_section, rel->r_offset, TRUE); 776 break; 777 778 case bfd_reloc_outofrange: 779 msg = _("internal error: out of range error"); 780 goto common_error; 781 782 case bfd_reloc_notsupported: 783 msg = _("internal error: unsupported relocation error"); 784 goto common_error; 785 786 case bfd_reloc_dangerous: 787 msg = _("internal error: dangerous error"); 788 goto common_error; 789 790 default: 791 msg = _("internal error: unknown error"); 792 /* fall through */ 793 794 common_error: 795 (*info->callbacks->warning) (info, msg, name, input_bfd, 796 input_section, rel->r_offset); 797 break; 798 } 799 } 800 } 801 802 return TRUE; 803 } 804 805 /* CR16C ELF uses three common sections: 806 One is for default common symbols (placed in usual common section). 807 Second is for near common symbols (placed in "ncommon" section). 808 Third is for far common symbols (placed in "fcommon" section). 809 The following implementation is based on elf32-mips architecture */ 810 811 static asection cr16c_elf_fcom_section; 812 static asymbol cr16c_elf_fcom_symbol; 813 static asymbol * cr16c_elf_fcom_symbol_ptr; 814 static asection cr16c_elf_ncom_section; 815 static asymbol cr16c_elf_ncom_symbol; 816 static asymbol * cr16c_elf_ncom_symbol_ptr; 817 818 /* Given a BFD section, try to locate the 819 corresponding ELF section index. */ 820 821 static bfd_boolean 822 elf32_cr16c_section_from_bfd_section (bfd *abfd ATTRIBUTE_UNUSED, 823 asection *sec, 824 int *retval) 825 { 826 if (strcmp (bfd_get_section_name (abfd, sec), ".fcommon") == 0) 827 *retval = SHN_CR16C_FCOMMON; 828 else if (strcmp (bfd_get_section_name (abfd, sec), ".ncommon") == 0) 829 *retval = SHN_CR16C_NCOMMON; 830 else 831 return FALSE; 832 833 return TRUE; 834 } 835 836 /* Handle the special CR16C section numbers that a symbol may use. */ 837 838 static void 839 elf32_cr16c_symbol_processing (bfd *abfd ATTRIBUTE_UNUSED, 840 asymbol *asym) 841 { 842 elf_symbol_type *elfsym = (elf_symbol_type *) asym; 843 unsigned int indx; 844 845 indx = elfsym->internal_elf_sym.st_shndx; 846 847 switch (indx) 848 { 849 case SHN_CR16C_FCOMMON: 850 if (cr16c_elf_fcom_section.name == NULL) 851 { 852 /* Initialize the far common section. */ 853 cr16c_elf_fcom_section.name = ".fcommon"; 854 cr16c_elf_fcom_section.flags = SEC_IS_COMMON | SEC_ALLOC; 855 cr16c_elf_fcom_section.output_section = &cr16c_elf_fcom_section; 856 cr16c_elf_fcom_section.symbol = &cr16c_elf_fcom_symbol; 857 cr16c_elf_fcom_section.symbol_ptr_ptr = &cr16c_elf_fcom_symbol_ptr; 858 cr16c_elf_fcom_symbol.name = ".fcommon"; 859 cr16c_elf_fcom_symbol.flags = BSF_SECTION_SYM; 860 cr16c_elf_fcom_symbol.section = &cr16c_elf_fcom_section; 861 cr16c_elf_fcom_symbol_ptr = &cr16c_elf_fcom_symbol; 862 } 863 asym->section = &cr16c_elf_fcom_section; 864 asym->value = elfsym->internal_elf_sym.st_size; 865 break; 866 case SHN_CR16C_NCOMMON: 867 if (cr16c_elf_ncom_section.name == NULL) 868 { 869 /* Initialize the far common section. */ 870 cr16c_elf_ncom_section.name = ".ncommon"; 871 cr16c_elf_ncom_section.flags = SEC_IS_COMMON | SEC_ALLOC; 872 cr16c_elf_ncom_section.output_section = &cr16c_elf_ncom_section; 873 cr16c_elf_ncom_section.symbol = &cr16c_elf_ncom_symbol; 874 cr16c_elf_ncom_section.symbol_ptr_ptr = &cr16c_elf_ncom_symbol_ptr; 875 cr16c_elf_ncom_symbol.name = ".ncommon"; 876 cr16c_elf_ncom_symbol.flags = BSF_SECTION_SYM; 877 cr16c_elf_ncom_symbol.section = &cr16c_elf_ncom_section; 878 cr16c_elf_ncom_symbol_ptr = &cr16c_elf_ncom_symbol; 879 } 880 asym->section = &cr16c_elf_ncom_section; 881 asym->value = elfsym->internal_elf_sym.st_size; 882 break; 883 } 884 } 885 886 /* Hook called by the linker routine which adds symbols from an object 887 file. We must handle the special cr16c section numbers here. */ 888 889 static bfd_boolean 890 elf32_cr16c_add_symbol_hook (bfd *abfd, 891 struct bfd_link_info *info ATTRIBUTE_UNUSED, 892 Elf_Internal_Sym *sym, 893 const char **namep ATTRIBUTE_UNUSED, 894 flagword *flagsp ATTRIBUTE_UNUSED, 895 asection **secp, 896 bfd_vma *valp) 897 { 898 unsigned int indx = sym->st_shndx; 899 900 switch (indx) 901 { 902 case SHN_CR16C_FCOMMON: 903 *secp = bfd_make_section_old_way (abfd, ".fcommon"); 904 (*secp)->flags |= SEC_IS_COMMON; 905 *valp = sym->st_size; 906 break; 907 case SHN_CR16C_NCOMMON: 908 *secp = bfd_make_section_old_way (abfd, ".ncommon"); 909 (*secp)->flags |= SEC_IS_COMMON; 910 *valp = sym->st_size; 911 break; 912 } 913 914 return TRUE; 915 } 916 917 static int 918 elf32_cr16c_link_output_symbol_hook (struct bfd_link_info *info ATTRIBUTE_UNUSED, 919 const char *name ATTRIBUTE_UNUSED, 920 Elf_Internal_Sym *sym, 921 asection *input_sec, 922 struct elf_link_hash_entry *h ATTRIBUTE_UNUSED) 923 { 924 /* If we see a common symbol, which implies a relocatable link, then 925 if a symbol was in a special common section in an input file, mark 926 it as a special common in the output file. */ 927 928 if (sym->st_shndx == SHN_COMMON) 929 { 930 if (strcmp (input_sec->name, ".fcommon") == 0) 931 sym->st_shndx = SHN_CR16C_FCOMMON; 932 else if (strcmp (input_sec->name, ".ncommon") == 0) 933 sym->st_shndx = SHN_CR16C_NCOMMON; 934 } 935 936 return 1; 937 } 938 939 /* Definitions for setting CR16C target vector. */ 940 #define TARGET_LITTLE_SYM cr16c_elf32_vec 941 #define TARGET_LITTLE_NAME "elf32-cr16c" 942 #define ELF_ARCH bfd_arch_cr16c 943 #define ELF_MACHINE_CODE EM_CR 944 #define ELF_MAXPAGESIZE 0x1 945 #define elf_symbol_leading_char '_' 946 947 #define bfd_elf32_bfd_reloc_type_lookup elf_cr16c_reloc_type_lookup 948 #define bfd_elf32_bfd_reloc_name_lookup elf_cr16c_reloc_name_lookup 949 #define elf_info_to_howto elf_cr16c_info_to_howto 950 #define elf_info_to_howto_rel elf_cr16c_info_to_howto_rel 951 #define elf_backend_relocate_section elf32_cr16c_relocate_section 952 #define elf_backend_symbol_processing elf32_cr16c_symbol_processing 953 #define elf_backend_section_from_bfd_section elf32_cr16c_section_from_bfd_section 954 #define elf_backend_add_symbol_hook elf32_cr16c_add_symbol_hook 955 #define elf_backend_link_output_symbol_hook elf32_cr16c_link_output_symbol_hook 956 957 #define elf_backend_can_gc_sections 1 958 959 #include "elf32-target.h" 960
