| 1 | /* BFD back-end for MAXQ COFF binaries. |
| 2 | Copyright 2004, 2007 Free Software Foundation, Inc. |
| 3 | |
| 4 | Contributed by Vineet Sharma (vineets@noida.hcltech.com) Inderpreet S. |
| 5 | (inderpreetb@noida.hcltech.com) |
| 6 | |
| 7 | HCL Technologies Ltd. |
| 8 | |
| 9 | This file is part of BFD, the Binary File Descriptor library. |
| 10 | |
| 11 | This program is free software; you can redistribute it and/or modify it |
| 12 | under the terms of the GNU General Public License as published by the Free |
| 13 | Software Foundation; either version 3 of the License, or (at your option) |
| 14 | any later version. |
| 15 | |
| 16 | This program is distributed in the hope that it will be useful, but |
| 17 | WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY |
| 18 | or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 19 | for more details. |
| 20 | |
| 21 | You should have received a copy of the GNU General Public License along |
| 22 | with this program; if not, write to the Free Software Foundation, Inc., |
| 23 | 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */ |
| 24 | |
| 25 | #include "sysdep.h" |
| 26 | #include "bfd.h" |
| 27 | #include "libbfd.h" |
| 28 | #include "coff/maxq.h" |
| 29 | #include "coff/internal.h" |
| 30 | #include "libcoff.h" |
| 31 | #include "libiberty.h" |
| 32 | |
| 33 | #ifndef MAXQ20 |
| 34 | #define MAXQ20 1 |
| 35 | #endif |
| 36 | |
| 37 | #define RTYPE2HOWTO(cache_ptr, dst) \ |
| 38 | ((cache_ptr)->howto = \ |
| 39 | ((dst)->r_type < 48 \ |
| 40 | ? howto_table + (((dst)->r_type==47) ? 6: ((dst)->r_type)) \ |
| 41 | : NULL)) |
| 42 | |
| 43 | #define COFF_DEFAULT_SECTION_ALIGNMENT_POWER (2) |
| 44 | |
| 45 | /* Code to swap in the reloc offset. */ |
| 46 | #define SWAP_IN_RELOC_OFFSET H_GET_16 |
| 47 | #define SWAP_OUT_RELOC_OFFSET H_PUT_16 |
| 48 | |
| 49 | #define SHORT_JUMP BFD_RELOC_16_PCREL_S2 |
| 50 | #define LONG_JUMP BFD_RELOC_14 |
| 51 | #define ABSOLUTE_ADDR_FOR_DATA BFD_RELOC_24 |
| 52 | |
| 53 | /* checks the range of short jump -127 to 128 */ |
| 54 | #define IS_SJUMP_RANGE(x) ((x > -128) && (x < 129)) |
| 55 | #define HIGH_WORD_MASK 0xff00 |
| 56 | #define LOW_WORD_MASK 0x00ff |
| 57 | |
| 58 | static long |
| 59 | get_symbol_value (asymbol *symbol) |
| 60 | { |
| 61 | long relocation = 0; |
| 62 | |
| 63 | if (bfd_is_com_section (symbol->section)) |
| 64 | relocation = 0; |
| 65 | else |
| 66 | relocation = symbol->value + |
| 67 | symbol->section->output_section->vma + symbol->section->output_offset; |
| 68 | |
| 69 | return relocation; |
| 70 | } |
| 71 | |
| 72 | /* This function performs all the maxq relocations. |
| 73 | FIXME: The handling of the addend in the 'BFD_*' |
| 74 | relocations types. */ |
| 75 | |
| 76 | static bfd_reloc_status_type |
| 77 | coff_maxq20_reloc (bfd * abfd, |
| 78 | arelent * reloc_entry, |
| 79 | asymbol * symbol_in, |
| 80 | void * data, |
| 81 | asection * input_section ATTRIBUTE_UNUSED, |
| 82 | bfd * output_bfd ATTRIBUTE_UNUSED, |
| 83 | char ** error_message ATTRIBUTE_UNUSED) |
| 84 | { |
| 85 | unsigned char *addr = NULL; |
| 86 | unsigned long x = 0; |
| 87 | long call_addr = 0; |
| 88 | short addend = 0; |
| 89 | long diff = 0; |
| 90 | |
| 91 | /* If this is an undefined symbol, return error. */ |
| 92 | if (symbol_in->section == &bfd_und_section |
| 93 | && (symbol_in->flags & BSF_WEAK) == 0) |
| 94 | return bfd_reloc_continue; |
| 95 | |
| 96 | if (data && reloc_entry) |
| 97 | { |
| 98 | addr = (unsigned char *) data + reloc_entry->address; |
| 99 | call_addr = call_addr - call_addr; |
| 100 | call_addr = get_symbol_value (symbol_in); |
| 101 | |
| 102 | /* Over here the value val stores the 8 bit/16 bit value. We will put a |
| 103 | check if we are moving a 16 bit immediate value into an 8 bit |
| 104 | register. In that case we will generate a Upper bytes into PFX[0] |
| 105 | and move the lower 8 bits as SRC. */ |
| 106 | |
| 107 | switch (reloc_entry->howto->type) |
| 108 | { |
| 109 | /* BFD_RELOC_16_PCREL_S2 47 Handles all the relative jumps and |
| 110 | calls Note: Every relative jump or call is in words. */ |
| 111 | case SHORT_JUMP: |
| 112 | /* Handle any addend. */ |
| 113 | addend = reloc_entry->addend; |
| 114 | |
| 115 | if (addend > call_addr || addend > 0) |
| 116 | call_addr = symbol_in->section->output_section->vma + addend; |
| 117 | else if (addend < call_addr && addend > 0) |
| 118 | call_addr = call_addr + addend; |
| 119 | else if (addend < 0) |
| 120 | call_addr = call_addr + addend; |
| 121 | |
| 122 | diff = ((call_addr << 1) - (reloc_entry->address << 1)); |
| 123 | |
| 124 | if (!IS_SJUMP_RANGE (diff)) |
| 125 | { |
| 126 | bfd_perror (_("Can't Make it a Short Jump")); |
| 127 | return bfd_reloc_outofrange; |
| 128 | } |
| 129 | |
| 130 | x = bfd_get_16 (abfd, addr); |
| 131 | |
| 132 | x = x & LOW_WORD_MASK; |
| 133 | x = x | (diff << 8); |
| 134 | bfd_put_16 (abfd, (bfd_vma) x, addr); |
| 135 | |
| 136 | return bfd_reloc_ok; |
| 137 | |
| 138 | case ABSOLUTE_ADDR_FOR_DATA: |
| 139 | case LONG_JUMP: |
| 140 | /* BFD_RELOC_14 Handles intersegment or long jumps which might be |
| 141 | from code to code or code to data segment jumps. Note: When this |
| 142 | fucntion is called by gas the section flags somehow do not |
| 143 | contain the info about the section type(CODE or DATA). Thus the |
| 144 | user needs to evoke the linker after assembling the files |
| 145 | because the Code-Code relocs are word aligned but code-data are |
| 146 | byte aligned. */ |
| 147 | addend = (reloc_entry->addend - reloc_entry->addend); |
| 148 | |
| 149 | /* Handle any addend. */ |
| 150 | addend = reloc_entry->addend; |
| 151 | |
| 152 | /* For relocation involving multiple file added becomes zero thus |
| 153 | this fails - check for zero added. In another case when we try |
| 154 | to add a stub to a file the addend shows the offset from the |
| 155 | start od this file. */ |
| 156 | addend = 0; |
| 157 | |
| 158 | if (!bfd_is_com_section (symbol_in->section) && |
| 159 | ((symbol_in->flags & BSF_OLD_COMMON) == 0)) |
| 160 | { |
| 161 | if (reloc_entry->addend > symbol_in->value) |
| 162 | addend = reloc_entry->addend - symbol_in->value; |
| 163 | |
| 164 | if ((reloc_entry->addend < symbol_in->value) |
| 165 | && (reloc_entry->addend != 0)) |
| 166 | addend = reloc_entry->addend - symbol_in->value; |
| 167 | |
| 168 | if (reloc_entry->addend == symbol_in->value) |
| 169 | addend = 0; |
| 170 | } |
| 171 | |
| 172 | if (bfd_is_com_section (symbol_in->section) || |
| 173 | ((symbol_in->flags & BSF_OLD_COMMON) != 0)) |
| 174 | addend = reloc_entry->addend; |
| 175 | |
| 176 | if (addend < 0 |
| 177 | && (call_addr < (long) (addend * (-1)))) |
| 178 | addend = 0; |
| 179 | |
| 180 | call_addr += addend; |
| 181 | |
| 182 | /* FIXME: This check does not work well with the assembler, |
| 183 | linker needs to be run always. */ |
| 184 | if ((symbol_in->section->flags & SEC_CODE) == SEC_CODE) |
| 185 | { |
| 186 | /* Convert it into words. */ |
| 187 | call_addr = call_addr >> 1; |
| 188 | |
| 189 | if (call_addr > 0xFFFF) /* Intersegment Jump. */ |
| 190 | { |
| 191 | bfd_perror (_("Exceeds Long Jump Range")); |
| 192 | return bfd_reloc_outofrange; |
| 193 | } |
| 194 | } |
| 195 | else |
| 196 | { |
| 197 | /* case ABSOLUTE_ADDR_FOR_DATA : Resolves any code-data |
| 198 | segemnt relocs. These are NOT word aligned. */ |
| 199 | |
| 200 | if (call_addr > 0xFFFF) /* Intersegment Jump. */ |
| 201 | { |
| 202 | bfd_perror (_("Absolute address Exceeds 16 bit Range")); |
| 203 | return bfd_reloc_outofrange; |
| 204 | } |
| 205 | } |
| 206 | |
| 207 | x = bfd_get_32 (abfd, addr); |
| 208 | |
| 209 | x = (x & 0xFF00FF00); |
| 210 | x = (x | ((call_addr & HIGH_WORD_MASK) >> 8)); |
| 211 | x = (x | (call_addr & LOW_WORD_MASK) << 16); |
| 212 | |
| 213 | bfd_put_32 (abfd, (bfd_vma) x, addr); |
| 214 | return bfd_reloc_ok; |
| 215 | |
| 216 | case BFD_RELOC_8: |
| 217 | addend = (reloc_entry->addend - reloc_entry->addend); |
| 218 | |
| 219 | if (!bfd_is_com_section (symbol_in->section) && |
| 220 | ((symbol_in->flags & BSF_OLD_COMMON) == 0)) |
| 221 | { |
| 222 | if (reloc_entry->addend > symbol_in->value) |
| 223 | addend = reloc_entry->addend - symbol_in->value; |
| 224 | if (reloc_entry->addend < symbol_in->value) |
| 225 | addend = reloc_entry->addend - symbol_in->value; |
| 226 | if (reloc_entry->addend == symbol_in->value) |
| 227 | addend = 0; |
| 228 | } |
| 229 | |
| 230 | if (bfd_is_com_section (symbol_in->section) || |
| 231 | ((symbol_in->flags & BSF_OLD_COMMON) != 0)) |
| 232 | addend = reloc_entry->addend; |
| 233 | |
| 234 | if (addend < 0 |
| 235 | && (call_addr < (long) (addend * (-1)))) |
| 236 | addend = 0; |
| 237 | |
| 238 | if (call_addr + addend > 0xFF) |
| 239 | { |
| 240 | bfd_perror (_("Absolute address Exceeds 8 bit Range")); |
| 241 | return bfd_reloc_outofrange; |
| 242 | } |
| 243 | |
| 244 | x = bfd_get_8 (abfd, addr); |
| 245 | x = x & 0x00; |
| 246 | x = x | (call_addr + addend); |
| 247 | |
| 248 | bfd_put_8 (abfd, (bfd_vma) x, addr); |
| 249 | return bfd_reloc_ok; |
| 250 | |
| 251 | case BFD_RELOC_16: |
| 252 | addend = (reloc_entry->addend - reloc_entry->addend); |
| 253 | if (!bfd_is_com_section (symbol_in->section) && |
| 254 | ((symbol_in->flags & BSF_OLD_COMMON) == 0)) |
| 255 | { |
| 256 | if (reloc_entry->addend > symbol_in->value) |
| 257 | addend = reloc_entry->addend - symbol_in->value; |
| 258 | |
| 259 | if (reloc_entry->addend < symbol_in->value) |
| 260 | addend = reloc_entry->addend - symbol_in->value; |
| 261 | |
| 262 | if (reloc_entry->addend == symbol_in->value) |
| 263 | addend = 0; |
| 264 | } |
| 265 | |
| 266 | if (bfd_is_com_section (symbol_in->section) || |
| 267 | ((symbol_in->flags & BSF_OLD_COMMON) != 0)) |
| 268 | addend = reloc_entry->addend; |
| 269 | |
| 270 | if (addend < 0 |
| 271 | && (call_addr < (long) (addend * (-1)))) |
| 272 | addend = 0; |
| 273 | |
| 274 | if ((call_addr + addend) > 0xFFFF) |
| 275 | { |
| 276 | bfd_perror (_("Absolute address Exceeds 16 bit Range")); |
| 277 | return bfd_reloc_outofrange; |
| 278 | } |
| 279 | else |
| 280 | { |
| 281 | unsigned short val = (call_addr + addend); |
| 282 | |
| 283 | x = bfd_get_16 (abfd, addr); |
| 284 | |
| 285 | /* LE */ |
| 286 | x = (x & 0x0000); /* Flush garbage value. */ |
| 287 | x = val; |
| 288 | if ((symbol_in->section->flags & SEC_CODE) == SEC_CODE) |
| 289 | x = x >> 1; /* Convert it into words. */ |
| 290 | } |
| 291 | |
| 292 | bfd_put_16 (abfd, (bfd_vma) x, addr); |
| 293 | return bfd_reloc_ok; |
| 294 | |
| 295 | case BFD_RELOC_32: |
| 296 | addend = (reloc_entry->addend - reloc_entry->addend); |
| 297 | |
| 298 | if (!bfd_is_com_section (symbol_in->section) && |
| 299 | ((symbol_in->flags & BSF_OLD_COMMON) == 0)) |
| 300 | { |
| 301 | if (reloc_entry->addend > symbol_in->value) |
| 302 | addend = reloc_entry->addend - symbol_in->value; |
| 303 | if (reloc_entry->addend < symbol_in->value) |
| 304 | addend = reloc_entry->addend - symbol_in->value; |
| 305 | if (reloc_entry->addend == symbol_in->value) |
| 306 | addend = 0; |
| 307 | } |
| 308 | |
| 309 | if (bfd_is_com_section (symbol_in->section) || |
| 310 | ((symbol_in->flags & BSF_OLD_COMMON) != 0)) |
| 311 | addend = reloc_entry->addend; |
| 312 | |
| 313 | if (addend < 0 |
| 314 | && (call_addr < (long) (addend * (-1)))) |
| 315 | addend = 0; |
| 316 | |
| 317 | if ((call_addr + addend) < 0) |
| 318 | { |
| 319 | bfd_perror ("Absolute address Exceeds 32 bit Range"); |
| 320 | return bfd_reloc_outofrange; |
| 321 | } |
| 322 | |
| 323 | x = bfd_get_32 (abfd, addr); |
| 324 | x = (x & 0x0000); /* Flush garbage value. */ |
| 325 | x = call_addr + addend; |
| 326 | if ((symbol_in->section->flags & SEC_CODE) == SEC_CODE) |
| 327 | x = x >> 1; /* Convert it into words. */ |
| 328 | |
| 329 | bfd_put_32 (abfd, (bfd_vma) x, addr); |
| 330 | return bfd_reloc_ok; |
| 331 | |
| 332 | default: |
| 333 | bfd_perror (_("Unrecognized Reloc Type")); |
| 334 | return bfd_reloc_notsupported; |
| 335 | } |
| 336 | } |
| 337 | |
| 338 | return bfd_reloc_notsupported; |
| 339 | } |
| 340 | |
| 341 | static reloc_howto_type howto_table[] = |
| 342 | { |
| 343 | EMPTY_HOWTO (0), |
| 344 | EMPTY_HOWTO (1), |
| 345 | { |
| 346 | BFD_RELOC_32, 0, 1, 8, FALSE, 0, complain_overflow_bitfield, |
| 347 | coff_maxq20_reloc, "32Bit", TRUE, 0x000000ff, 0x000000ff, TRUE |
| 348 | }, |
| 349 | { |
| 350 | SHORT_JUMP, 0, 1, 8, FALSE, 0, complain_overflow_bitfield, |
| 351 | coff_maxq20_reloc, "SHORT_JMP", TRUE, 0x000000ff, 0x000000ff, TRUE |
| 352 | }, |
| 353 | { |
| 354 | ABSOLUTE_ADDR_FOR_DATA, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 355 | coff_maxq20_reloc, "INTERSEGMENT_RELOC", TRUE, 0x00000000, 0x00000000, |
| 356 | FALSE |
| 357 | }, |
| 358 | { |
| 359 | BFD_RELOC_16, 0, 1, 8, FALSE, 0, complain_overflow_bitfield, |
| 360 | coff_maxq20_reloc, "16Bit", TRUE, 0x000000ff, 0x000000ff, TRUE |
| 361 | }, |
| 362 | { |
| 363 | LONG_JUMP, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, |
| 364 | coff_maxq20_reloc, "LONG_JUMP", TRUE, 0x00000000, 0x00000000, FALSE |
| 365 | }, |
| 366 | { |
| 367 | BFD_RELOC_8, 0, 1, 8, FALSE, 0, complain_overflow_bitfield, |
| 368 | coff_maxq20_reloc, "8bit", TRUE, 0x000000ff, 0x000000ff, TRUE |
| 369 | }, |
| 370 | EMPTY_HOWTO (8), |
| 371 | EMPTY_HOWTO (9), |
| 372 | EMPTY_HOWTO (10), |
| 373 | }; |
| 374 | |
| 375 | static reloc_howto_type * |
| 376 | maxq_reloc_type_lookup (bfd * abfd ATTRIBUTE_UNUSED, |
| 377 | bfd_reloc_code_real_type code) |
| 378 | { |
| 379 | switch (code) |
| 380 | { |
| 381 | /* SHORT JUMP */ |
| 382 | case BFD_RELOC_16_PCREL_S2: |
| 383 | return howto_table + 3; |
| 384 | |
| 385 | /* INTERSEGMENT JUMP */ |
| 386 | case BFD_RELOC_24: |
| 387 | return howto_table + 4; |
| 388 | |
| 389 | /* BYTE RELOC */ |
| 390 | case BFD_RELOC_8: |
| 391 | return howto_table + 7; |
| 392 | |
| 393 | /* WORD RELOC */ |
| 394 | case BFD_RELOC_16: |
| 395 | return howto_table + 5; |
| 396 | |
| 397 | /* LONG RELOC */ |
| 398 | case BFD_RELOC_32: |
| 399 | return howto_table + 2; |
| 400 | |
| 401 | /* LONG JUMP */ |
| 402 | case BFD_RELOC_14: |
| 403 | return howto_table + 6; |
| 404 | |
| 405 | default: |
| 406 | return NULL; |
| 407 | } |
| 408 | } |
| 409 | |
| 410 | static reloc_howto_type * |
| 411 | maxq_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, const char *r_name) |
| 412 | { |
| 413 | unsigned int i; |
| 414 | |
| 415 | for (i = 0; i < sizeof (howto_table) / sizeof (howto_table[0]); i++) |
| 416 | if (howto_table[i].name != NULL |
| 417 | && strcasecmp (howto_table[i].name, r_name) == 0) |
| 418 | return &howto_table[i]; |
| 419 | |
| 420 | return NULL; |
| 421 | } |
| 422 | |
| 423 | #define coff_bfd_reloc_type_lookup maxq_reloc_type_lookup |
| 424 | #define coff_bfd_reloc_name_lookup maxq_reloc_name_lookup |
| 425 | |
| 426 | /* Perform any necessary magic to the addend in a reloc entry. */ |
| 427 | #define CALC_ADDEND(abfd, symbol, ext_reloc, cache_ptr) \ |
| 428 | cache_ptr->addend = ext_reloc.r_offset; |
| 429 | |
| 430 | #include "coffcode.h" |
| 431 | |
| 432 | #ifndef TARGET_UNDERSCORE |
| 433 | #define TARGET_UNDERSCORE 1 |
| 434 | #endif |
| 435 | |
| 436 | #ifndef EXTRA_S_FLAGS |
| 437 | #define EXTRA_S_FLAGS 0 |
| 438 | #endif |
| 439 | |
| 440 | /* Forward declaration for use initialising alternative_target field. */ |
| 441 | CREATE_LITTLE_COFF_TARGET_VEC (maxqcoff_vec, "coff-maxq", 0, EXTRA_S_FLAGS, |
| 442 | TARGET_UNDERSCORE, NULL, COFF_SWAP_TABLE); |
| 443 | |