1 /* BFD backend for MIPS BSD (a.out) binaries. 2 Copyright (C) 1993, 94, 95, 97, 98, 1999 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 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 TARGET_PAGE_SIZE 4096 32 #define SEGMENT_SIZE TARGET_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 static 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 static 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 bfd_mach_m68010: 131 N_SET_MACHTYPE(*execp, M_68010); 132 break; 133 default: 134 case bfd_mach_m68020: 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 ATTRIBUTE_UNUSED; 191 arelent *reloc_entry; 192 struct symbol_cache_entry *symbol; 193 PTR data ATTRIBUTE_UNUSED; 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 ATTRIBUTE_UNUSED; 244 arelent *reloc_entry; 245 asymbol *symbol; 246 PTR data ATTRIBUTE_UNUSED; 247 asection *input_section ATTRIBUTE_UNUSED; 248 bfd *output_bfd; 249 char **error_message ATTRIBUTE_UNUSED; 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 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, /* entry is text address */ 380 0, /* exec_hdr_flags */ 381 TARGET_PAGE_SIZE, /* text vma */ 382 MY_set_sizes, 383 0, /* text size includes exec header */ 384 0, /* add_dynamic_symbols */ 385 0, /* add_one_symbol */ 386 0, /* link_dynamic_object */ 387 0, /* write_dynamic_symbol */ 388 0, /* check_dynamic_reloc */ 389 0 /* finish_dynamic_link */ 390 }; 391 392 extern const bfd_target aout_mips_big_vec; 393 394 const bfd_target aout_mips_little_vec = 395 { 396 "a.out-mips-little", /* name */ 397 bfd_target_aout_flavour, 398 BFD_ENDIAN_LITTLE, /* target byte order (little) */ 399 BFD_ENDIAN_LITTLE, /* target headers byte order (little) */ 400 (HAS_RELOC | EXEC_P | /* object flags */ 401 HAS_LINENO | HAS_DEBUG | 402 HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED), 403 (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC | SEC_CODE | SEC_DATA), 404 MY_symbol_leading_char, 405 ' ', /* ar_pad_char */ 406 15, /* ar_max_namelen */ 407 bfd_getl64, bfd_getl_signed_64, bfd_putl64, 408 bfd_getl32, bfd_getl_signed_32, bfd_putl32, 409 bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* data */ 410 bfd_getl64, bfd_getl_signed_64, bfd_putl64, 411 bfd_getl32, bfd_getl_signed_32, bfd_putl32, 412 bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* hdrs */ 413 {_bfd_dummy_target, MY_object_p, /* bfd_check_format */ 414 bfd_generic_archive_p, MY_core_file_p}, 415 {bfd_false, MY_mkobject, /* bfd_set_format */ 416 _bfd_generic_mkarchive, bfd_false}, 417 {bfd_false, MY_write_object_contents, /* bfd_write_contents */ 418 _bfd_write_archive_contents, bfd_false}, 419 420 BFD_JUMP_TABLE_GENERIC (MY), 421 BFD_JUMP_TABLE_COPY (MY), 422 BFD_JUMP_TABLE_CORE (MY), 423 BFD_JUMP_TABLE_ARCHIVE (MY), 424 BFD_JUMP_TABLE_SYMBOLS (MY), 425 BFD_JUMP_TABLE_RELOCS (MY), 426 BFD_JUMP_TABLE_WRITE (MY), 427 BFD_JUMP_TABLE_LINK (MY), 428 BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic), 429 430 & aout_mips_big_vec, 431 432 (PTR) MY_backend_data 433 }; 434 435 const bfd_target aout_mips_big_vec = 436 { 437 "a.out-mips-big", /* name */ 438 bfd_target_aout_flavour, 439 BFD_ENDIAN_BIG, /* target byte order (big) */ 440 BFD_ENDIAN_BIG, /* target headers byte order (big) */ 441 (HAS_RELOC | EXEC_P | /* object flags */ 442 HAS_LINENO | HAS_DEBUG | 443 HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED), 444 (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC | SEC_CODE | SEC_DATA), 445 MY_symbol_leading_char, 446 ' ', /* ar_pad_char */ 447 15, /* ar_max_namelen */ 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, /* data */ 451 bfd_getb64, bfd_getb_signed_64, bfd_putb64, 452 bfd_getb32, bfd_getb_signed_32, bfd_putb32, 453 bfd_getb16, bfd_getb_signed_16, bfd_putb16, /* hdrs */ 454 {_bfd_dummy_target, MY_object_p, /* bfd_check_format */ 455 bfd_generic_archive_p, MY_core_file_p}, 456 {bfd_false, MY_mkobject, /* bfd_set_format */ 457 _bfd_generic_mkarchive, bfd_false}, 458 {bfd_false, MY_write_object_contents, /* bfd_write_contents */ 459 _bfd_write_archive_contents, bfd_false}, 460 461 BFD_JUMP_TABLE_GENERIC (MY), 462 BFD_JUMP_TABLE_COPY (MY), 463 BFD_JUMP_TABLE_CORE (MY), 464 BFD_JUMP_TABLE_ARCHIVE (MY), 465 BFD_JUMP_TABLE_SYMBOLS (MY), 466 BFD_JUMP_TABLE_RELOCS (MY), 467 BFD_JUMP_TABLE_WRITE (MY), 468 BFD_JUMP_TABLE_LINK (MY), 469 BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic), 470 471 & aout_mips_little_vec, 472 473 (PTR) MY_backend_data 474 }; 475