| 1 | /* BFD backend for MIPS BSD (a.out) binaries. |
| 2 | Copyright (C) 1993, 1994 Free Software Foundation, Inc. |
| 3 | Written by Ralph Campbell. |
| 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., 675 Mass Ave, Cambridge, MA 02139, USA. */ |
| 20 | |
| 21 | #define BYTES_IN_WORD 4 |
| 22 | /* #define ENTRY_CAN_BE_ZERO */ |
| 23 | #define N_HEADER_IN_TEXT(x) 1 |
| 24 | #define N_SHARED_LIB(x) 0 |
| 25 | #define N_TXTADDR(x) \ |
| 26 | (N_MAGIC(x) != ZMAGIC ? (x).a_entry : /* object file or NMAGIC */\ |
| 27 | TEXT_START_ADDR + EXEC_BYTES_SIZE /* no padding */\ |
| 28 | ) |
| 29 | #define N_DATADDR(x) (N_TXTADDR(x)+N_TXTSIZE(x)) |
| 30 | #define TEXT_START_ADDR 4096 |
| 31 | #define PAGE_SIZE 4096 |
| 32 | #define SEGMENT_SIZE PAGE_SIZE |
| 33 | #define DEFAULT_ARCH bfd_arch_mips |
| 34 | #define MACHTYPE_OK(mtype) ((mtype) == M_UNKNOWN \ |
| 35 | || (mtype) == M_MIPS1 || (mtype) == M_MIPS2) |
| 36 | #define MY_symbol_leading_char '\0' |
| 37 | |
| 38 | #define MY(OP) CAT(mipsbsd_,OP) |
| 39 | |
| 40 | #include "bfd.h" |
| 41 | #include "sysdep.h" |
| 42 | #include "libbfd.h" |
| 43 | #include "libaout.h" |
| 44 | |
| 45 | #define SET_ARCH_MACH(ABFD, EXEC) \ |
| 46 | MY(set_arch_mach)(ABFD, N_MACHTYPE (EXEC)); \ |
| 47 | MY(choose_reloc_size)(ABFD); |
| 48 | void MY(set_arch_mach) PARAMS ((bfd *abfd, int machtype)); |
| 49 | static void MY(choose_reloc_size) PARAMS ((bfd *abfd)); |
| 50 | |
| 51 | #define MY_write_object_contents MY(write_object_contents) |
| 52 | static boolean MY(write_object_contents) PARAMS ((bfd *abfd)); |
| 53 | |
| 54 | /* We can't use MY(x) here because it leads to a recursive call to CAT |
| 55 | when expanded inside JUMP_TABLE. */ |
| 56 | #define MY_bfd_reloc_type_lookup mipsbsd_reloc_howto_type_lookup |
| 57 | #define MY_canonicalize_reloc mipsbsd_canonicalize_reloc |
| 58 | |
| 59 | #define MY_bfd_link_hash_table_create _bfd_generic_link_hash_table_create |
| 60 | #define MY_bfd_link_add_symbols _bfd_generic_link_add_symbols |
| 61 | #define MY_final_link_callback unused |
| 62 | #define MY_bfd_final_link _bfd_generic_final_link |
| 63 | |
| 64 | #define MY_backend_data &MY(backend_data) |
| 65 | #define MY_BFD_TARGET |
| 66 | |
| 67 | #include "aout-target.h" |
| 68 | |
| 69 | void |
| 70 | MY(set_arch_mach) (abfd, machtype) |
| 71 | bfd *abfd; |
| 72 | int machtype; |
| 73 | { |
| 74 | enum bfd_architecture arch; |
| 75 | long machine; |
| 76 | |
| 77 | /* Determine the architecture and machine type of the object file. */ |
| 78 | switch (machtype) { |
| 79 | |
| 80 | case M_MIPS1: |
| 81 | arch = bfd_arch_mips; |
| 82 | machine = 3000; |
| 83 | break; |
| 84 | |
| 85 | case M_MIPS2: |
| 86 | arch = bfd_arch_mips; |
| 87 | machine = 4000; |
| 88 | break; |
| 89 | |
| 90 | default: |
| 91 | arch = bfd_arch_obscure; |
| 92 | machine = 0; |
| 93 | break; |
| 94 | } |
| 95 | bfd_set_arch_mach(abfd, arch, machine); |
| 96 | } |
| 97 | |
| 98 | /* Determine the size of a relocation entry, based on the architecture */ |
| 99 | static void |
| 100 | MY(choose_reloc_size) (abfd) |
| 101 | bfd *abfd; |
| 102 | { |
| 103 | switch (bfd_get_arch(abfd)) { |
| 104 | case bfd_arch_sparc: |
| 105 | case bfd_arch_a29k: |
| 106 | case bfd_arch_mips: |
| 107 | obj_reloc_entry_size (abfd) = RELOC_EXT_SIZE; |
| 108 | break; |
| 109 | default: |
| 110 | obj_reloc_entry_size (abfd) = RELOC_STD_SIZE; |
| 111 | break; |
| 112 | } |
| 113 | } |
| 114 | |
| 115 | /* Write an object file in BSD a.out format. |
| 116 | Section contents have already been written. We write the |
| 117 | file header, symbols, and relocation. */ |
| 118 | |
| 119 | static boolean |
| 120 | MY(write_object_contents) (abfd) |
| 121 | bfd *abfd; |
| 122 | { |
| 123 | struct external_exec exec_bytes; |
| 124 | struct internal_exec *execp = exec_hdr (abfd); |
| 125 | |
| 126 | /* Magic number, maestro, please! */ |
| 127 | switch (bfd_get_arch(abfd)) { |
| 128 | case bfd_arch_m68k: |
| 129 | switch (bfd_get_mach(abfd)) { |
| 130 | case 68010: |
| 131 | N_SET_MACHTYPE(*execp, M_68010); |
| 132 | break; |
| 133 | default: |
| 134 | case 68020: |
| 135 | N_SET_MACHTYPE(*execp, M_68020); |
| 136 | break; |
| 137 | } |
| 138 | break; |
| 139 | case bfd_arch_sparc: |
| 140 | N_SET_MACHTYPE(*execp, M_SPARC); |
| 141 | break; |
| 142 | case bfd_arch_i386: |
| 143 | N_SET_MACHTYPE(*execp, M_386); |
| 144 | break; |
| 145 | case bfd_arch_a29k: |
| 146 | N_SET_MACHTYPE(*execp, M_29K); |
| 147 | break; |
| 148 | case bfd_arch_mips: |
| 149 | switch (bfd_get_mach(abfd)) { |
| 150 | case 4000: |
| 151 | case 6000: |
| 152 | N_SET_MACHTYPE(*execp, M_MIPS2); |
| 153 | break; |
| 154 | default: |
| 155 | N_SET_MACHTYPE(*execp, M_MIPS1); |
| 156 | break; |
| 157 | } |
| 158 | break; |
| 159 | default: |
| 160 | N_SET_MACHTYPE(*execp, M_UNKNOWN); |
| 161 | } |
| 162 | |
| 163 | MY(choose_reloc_size)(abfd); |
| 164 | |
| 165 | WRITE_HEADERS(abfd, execp); |
| 166 | |
| 167 | return true; |
| 168 | } |
| 169 | |
| 170 | /* |
| 171 | * MIPS relocation types. |
| 172 | */ |
| 173 | #define MIPS_RELOC_32 0 |
| 174 | #define MIPS_RELOC_JMP 1 |
| 175 | #define MIPS_RELOC_WDISP16 2 |
| 176 | #define MIPS_RELOC_HI16 3 |
| 177 | #define MIPS_RELOC_HI16_S 4 |
| 178 | #define MIPS_RELOC_LO16 5 |
| 179 | |
| 180 | /* |
| 181 | * This is only called when performing a BFD_RELOC_MIPS_JMP relocation. |
| 182 | * The jump destination address is formed from the upper 4 bits of the |
| 183 | * "current" program counter concatenated with the jump instruction's |
| 184 | * 26 bit field and two trailing zeros. |
| 185 | * If the destination address is not in the same segment as the "current" |
| 186 | * program counter, then we need to signal an error. |
| 187 | */ |
| 188 | static bfd_reloc_status_type |
| 189 | mips_fix_jmp_addr (abfd,reloc_entry,symbol,data,input_section,output_bfd) |
| 190 | bfd *abfd; |
| 191 | arelent *reloc_entry; |
| 192 | struct symbol_cache_entry *symbol; |
| 193 | PTR data; |
| 194 | asection *input_section; |
| 195 | bfd *output_bfd; |
| 196 | { |
| 197 | bfd_vma relocation, pc; |
| 198 | |
| 199 | /* If this is a partial relocation, just continue. */ |
| 200 | if (output_bfd != (bfd *)NULL) |
| 201 | return bfd_reloc_continue; |
| 202 | |
| 203 | /* If this is an undefined symbol, return error */ |
| 204 | if (bfd_is_und_section (symbol->section) |
| 205 | && (symbol->flags & BSF_WEAK) == 0) |
| 206 | return bfd_reloc_undefined; |
| 207 | |
| 208 | /* |
| 209 | * Work out which section the relocation is targetted at and the |
| 210 | * initial relocation command value. |
| 211 | */ |
| 212 | if (bfd_is_com_section (symbol->section)) |
| 213 | relocation = 0; |
| 214 | else |
| 215 | relocation = symbol->value; |
| 216 | |
| 217 | relocation += symbol->section->output_section->vma; |
| 218 | relocation += symbol->section->output_offset; |
| 219 | relocation += reloc_entry->addend; |
| 220 | |
| 221 | pc = input_section->output_section->vma + input_section->output_offset + |
| 222 | reloc_entry->address + 4; |
| 223 | |
| 224 | if ((relocation & 0xF0000000) != (pc & 0xF0000000)) |
| 225 | return bfd_reloc_overflow; |
| 226 | |
| 227 | return bfd_reloc_continue; |
| 228 | } |
| 229 | |
| 230 | /* |
| 231 | * This is only called when performing a BFD_RELOC_HI16_S relocation. |
| 232 | * We need to see if bit 15 is set in the result. If it is, we add |
| 233 | * 0x10000 and continue normally. This will compensate for the sign extension |
| 234 | * when the low bits are added at run time. |
| 235 | */ |
| 236 | static bfd_reloc_status_type |
| 237 | mips_fix_hi16_s PARAMS ((bfd *, arelent *, asymbol *, PTR, |
| 238 | asection *, bfd *, char **)); |
| 239 | |
| 240 | static bfd_reloc_status_type |
| 241 | mips_fix_hi16_s (abfd, reloc_entry, symbol, data, input_section, |
| 242 | output_bfd, error_message) |
| 243 | bfd *abfd; |
| 244 | arelent *reloc_entry; |
| 245 | asymbol *symbol; |
| 246 | PTR data; |
| 247 | asection *input_section; |
| 248 | bfd *output_bfd; |
| 249 | char **error_message; |
| 250 | { |
| 251 | bfd_vma relocation; |
| 252 | |
| 253 | /* If this is a partial relocation, just continue. */ |
| 254 | if (output_bfd != (bfd *)NULL) |
| 255 | return bfd_reloc_continue; |
| 256 | |
| 257 | /* If this is an undefined symbol, return error */ |
| 258 | if (bfd_is_und_section (symbol->section) |
| 259 | && (symbol->flags & BSF_WEAK) == 0) |
| 260 | return bfd_reloc_undefined; |
| 261 | |
| 262 | /* |
| 263 | * Work out which section the relocation is targetted at and the |
| 264 | * initial relocation command value. |
| 265 | */ |
| 266 | if (bfd_is_com_section (symbol->section)) |
| 267 | relocation = 0; |
| 268 | else |
| 269 | relocation = symbol->value; |
| 270 | |
| 271 | relocation += symbol->section->output_section->vma; |
| 272 | relocation += symbol->section->output_offset; |
| 273 | relocation += reloc_entry->addend; |
| 274 | |
| 275 | if (relocation & 0x8000) |
| 276 | reloc_entry->addend += 0x10000; |
| 277 | |
| 278 | return bfd_reloc_continue; |
| 279 | } |
| 280 | |
| 281 | static reloc_howto_type mips_howto_table_ext[] = { |
| 282 | {MIPS_RELOC_32, 0, 2, 32, false, 0, complain_overflow_bitfield, 0, |
| 283 | "32", false, 0, 0xffffffff, false}, |
| 284 | {MIPS_RELOC_JMP, 2, 2, 26, false, 0, complain_overflow_dont, |
| 285 | mips_fix_jmp_addr, |
| 286 | "MIPS_JMP", false, 0, 0x03ffffff, false}, |
| 287 | {MIPS_RELOC_WDISP16, 2, 2, 16, true, 0, complain_overflow_signed, 0, |
| 288 | "WDISP16", false, 0, 0x0000ffff, false}, |
| 289 | {MIPS_RELOC_HI16, 16, 2, 16, false, 0, complain_overflow_bitfield, 0, |
| 290 | "HI16", false, 0, 0x0000ffff, false}, |
| 291 | {MIPS_RELOC_HI16_S, 16, 2, 16, false, 0, complain_overflow_bitfield, |
| 292 | mips_fix_hi16_s, |
| 293 | "HI16_S", false, 0, 0x0000ffff, false}, |
| 294 | {MIPS_RELOC_LO16, 0, 2, 16, false, 0, complain_overflow_dont, 0, |
| 295 | "LO16", false, 0, 0x0000ffff, false}, |
| 296 | }; |
| 297 | |
| 298 | static const reloc_howto_type * |
| 299 | MY(reloc_howto_type_lookup) (abfd, code) |
| 300 | bfd *abfd; |
| 301 | bfd_reloc_code_real_type code; |
| 302 | { |
| 303 | |
| 304 | if (bfd_get_arch (abfd) != bfd_arch_mips) |
| 305 | return 0; |
| 306 | |
| 307 | switch (code) |
| 308 | { |
| 309 | case BFD_RELOC_CTOR: |
| 310 | case BFD_RELOC_32: |
| 311 | return (&mips_howto_table_ext[MIPS_RELOC_32]); |
| 312 | case BFD_RELOC_MIPS_JMP: |
| 313 | return (&mips_howto_table_ext[MIPS_RELOC_JMP]); |
| 314 | case BFD_RELOC_16_PCREL_S2: |
| 315 | return (&mips_howto_table_ext[MIPS_RELOC_WDISP16]); |
| 316 | case BFD_RELOC_HI16: |
| 317 | return (&mips_howto_table_ext[MIPS_RELOC_HI16]); |
| 318 | case BFD_RELOC_HI16_S: |
| 319 | return (&mips_howto_table_ext[MIPS_RELOC_HI16_S]); |
| 320 | case BFD_RELOC_LO16: |
| 321 | return (&mips_howto_table_ext[MIPS_RELOC_LO16]); |
| 322 | default: |
| 323 | return 0; |
| 324 | } |
| 325 | } |
| 326 | |
| 327 | /* |
| 328 | * This is just like the standard aoutx.h version but we need to do our |
| 329 | * own mapping of external reloc type values to howto entries. |
| 330 | */ |
| 331 | long |
| 332 | MY(canonicalize_reloc)(abfd, section, relptr, symbols) |
| 333 | bfd *abfd; |
| 334 | sec_ptr section; |
| 335 | arelent **relptr; |
| 336 | asymbol **symbols; |
| 337 | { |
| 338 | arelent *tblptr = section->relocation; |
| 339 | unsigned int count, c; |
| 340 | extern reloc_howto_type NAME(aout,ext_howto_table)[]; |
| 341 | |
| 342 | /* If we have already read in the relocation table, return the values. */ |
| 343 | if (section->flags & SEC_CONSTRUCTOR) { |
| 344 | arelent_chain *chain = section->constructor_chain; |
| 345 | |
| 346 | for (count = 0; count < section->reloc_count; count++) { |
| 347 | *relptr++ = &chain->relent; |
| 348 | chain = chain->next; |
| 349 | } |
| 350 | *relptr = 0; |
| 351 | return section->reloc_count; |
| 352 | } |
| 353 | if (tblptr && section->reloc_count) { |
| 354 | for (count = 0; count++ < section->reloc_count;) |
| 355 | *relptr++ = tblptr++; |
| 356 | *relptr = 0; |
| 357 | return section->reloc_count; |
| 358 | } |
| 359 | |
| 360 | if (!NAME(aout,slurp_reloc_table)(abfd, section, symbols)) |
| 361 | return -1; |
| 362 | tblptr = section->relocation; |
| 363 | |
| 364 | /* fix up howto entries */ |
| 365 | for (count = 0; count++ < section->reloc_count;) |
| 366 | { |
| 367 | c = tblptr->howto - NAME(aout,ext_howto_table); |
| 368 | tblptr->howto = &mips_howto_table_ext[c]; |
| 369 | |
| 370 | *relptr++ = tblptr++; |
| 371 | } |
| 372 | *relptr = 0; |
| 373 | return section->reloc_count; |
| 374 | } |
| 375 | |
| 376 | static CONST struct aout_backend_data MY(backend_data) = { |
| 377 | 0, /* zmagic contiguous */ |
| 378 | 1, /* text incl header */ |
| 379 | 0, /* exec_hdr_flags */ |
| 380 | PAGE_SIZE, /* text vma */ |
| 381 | MY_set_sizes, |
| 382 | 0, /* text size includes exec header */ |
| 383 | 0, /* add_dynamic_symbols */ |
| 384 | 0, /* add_one_symbol */ |
| 385 | 0, /* link_dynamic_object */ |
| 386 | 0, /* write_dynamic_symbol */ |
| 387 | 0, /* check_dynamic_reloc */ |
| 388 | 0 /* finish_dynamic_link */ |
| 389 | }; |
| 390 | |
| 391 | const bfd_target aout_mips_little_vec = |
| 392 | { |
| 393 | "a.out-mips-little", /* name */ |
| 394 | bfd_target_aout_flavour, |
| 395 | false, /* target byte order (little) */ |
| 396 | false, /* target headers byte order (little) */ |
| 397 | (HAS_RELOC | EXEC_P | /* object flags */ |
| 398 | HAS_LINENO | HAS_DEBUG | |
| 399 | HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED), |
| 400 | (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */ |
| 401 | MY_symbol_leading_char, |
| 402 | ' ', /* ar_pad_char */ |
| 403 | 15, /* ar_max_namelen */ |
| 404 | 1, /* minimum alignment */ |
| 405 | bfd_getl64, bfd_getl_signed_64, bfd_putl64, |
| 406 | bfd_getl32, bfd_getl_signed_32, bfd_putl32, |
| 407 | bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* data */ |
| 408 | bfd_getl64, bfd_getl_signed_64, bfd_putl64, |
| 409 | bfd_getl32, bfd_getl_signed_32, bfd_putl32, |
| 410 | bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* hdrs */ |
| 411 | {_bfd_dummy_target, MY_object_p, /* bfd_check_format */ |
| 412 | bfd_generic_archive_p, MY_core_file_p}, |
| 413 | {bfd_false, MY_mkobject, /* bfd_set_format */ |
| 414 | _bfd_generic_mkarchive, bfd_false}, |
| 415 | {bfd_false, MY_write_object_contents, /* bfd_write_contents */ |
| 416 | _bfd_write_archive_contents, bfd_false}, |
| 417 | |
| 418 | BFD_JUMP_TABLE_GENERIC (MY), |
| 419 | BFD_JUMP_TABLE_COPY (MY), |
| 420 | BFD_JUMP_TABLE_CORE (MY), |
| 421 | BFD_JUMP_TABLE_ARCHIVE (MY), |
| 422 | BFD_JUMP_TABLE_SYMBOLS (MY), |
| 423 | BFD_JUMP_TABLE_RELOCS (MY), |
| 424 | BFD_JUMP_TABLE_WRITE (MY), |
| 425 | BFD_JUMP_TABLE_LINK (MY), |
| 426 | BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic), |
| 427 | |
| 428 | (PTR) MY_backend_data, |
| 429 | }; |
| 430 | |
| 431 | const bfd_target aout_mips_big_vec = |
| 432 | { |
| 433 | "a.out-mips-big", /* name */ |
| 434 | bfd_target_aout_flavour, |
| 435 | true, /* target byte order (big) */ |
| 436 | true, /* target headers byte order (big) */ |
| 437 | (HAS_RELOC | EXEC_P | /* object flags */ |
| 438 | HAS_LINENO | HAS_DEBUG | |
| 439 | HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED), |
| 440 | (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */ |
| 441 | MY_symbol_leading_char, |
| 442 | ' ', /* ar_pad_char */ |
| 443 | 15, /* ar_max_namelen */ |
| 444 | 1, /* minimum alignment */ |
| 445 | bfd_getb64, bfd_getb_signed_64, bfd_putb64, |
| 446 | bfd_getb32, bfd_getb_signed_32, bfd_putb32, |
| 447 | bfd_getb16, bfd_getb_signed_16, bfd_putb16, /* data */ |
| 448 | bfd_getb64, bfd_getb_signed_64, bfd_putb64, |
| 449 | bfd_getb32, bfd_getb_signed_32, bfd_putb32, |
| 450 | bfd_getb16, bfd_getb_signed_16, bfd_putb16, /* hdrs */ |
| 451 | {_bfd_dummy_target, MY_object_p, /* bfd_check_format */ |
| 452 | bfd_generic_archive_p, MY_core_file_p}, |
| 453 | {bfd_false, MY_mkobject, /* bfd_set_format */ |
| 454 | _bfd_generic_mkarchive, bfd_false}, |
| 455 | {bfd_false, MY_write_object_contents, /* bfd_write_contents */ |
| 456 | _bfd_write_archive_contents, bfd_false}, |
| 457 | |
| 458 | BFD_JUMP_TABLE_GENERIC (MY), |
| 459 | BFD_JUMP_TABLE_COPY (MY), |
| 460 | BFD_JUMP_TABLE_CORE (MY), |
| 461 | BFD_JUMP_TABLE_ARCHIVE (MY), |
| 462 | BFD_JUMP_TABLE_SYMBOLS (MY), |
| 463 | BFD_JUMP_TABLE_RELOCS (MY), |
| 464 | BFD_JUMP_TABLE_WRITE (MY), |
| 465 | BFD_JUMP_TABLE_LINK (MY), |
| 466 | BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic), |
| 467 | |
| 468 | (PTR) MY_backend_data, |
| 469 | }; |