1 /* BFD back-end for RISC iX (Acorn, arm) binaries. 2 Copyright (C) 1994-2014 Free Software Foundation, Inc. 3 Contributed by Richard Earnshaw (rwe (at) pegasus.esprit.ec.org) 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 23 /* RISC iX overloads the MAGIC field to indicate more than just the usual 24 [ZNO]MAGIC values. Also included are squeezing information and 25 shared library usage. */ 26 27 /* The following come from the man page. */ 28 #define SHLIBLEN 60 29 30 #define MF_IMPURE 00200 31 #define MF_SQUEEZED 01000 32 #define MF_USES_SL 02000 33 #define MF_IS_SL 04000 34 35 /* Common combinations. */ 36 37 /* Demand load (impure text). */ 38 #define IMAGIC (MF_IMPURE | ZMAGIC) 39 40 /* OMAGIC with large header. 41 May contain a ref to a shared lib required by the object. */ 42 #define SPOMAGIC (MF_USES_SL | OMAGIC) 43 44 /* A reference to a shared library. 45 The text portion of the object contains "overflow text" from 46 the shared library to be linked in with an object. */ 47 #define SLOMAGIC (MF_IS_SL | OMAGIC) 48 49 /* Sqeezed demand paged. 50 NOTE: This interpretation of QMAGIC seems to be at variance 51 with that used on other architectures. */ 52 #define QMAGIC (MF_SQUEEZED | ZMAGIC) 53 54 /* Program which uses sl. */ 55 #define SPZMAGIC (MF_USES_SL | ZMAGIC) 56 57 /* Sqeezed ditto. */ 58 #define SPQMAGIC (MF_USES_SL | QMAGIC) 59 60 /* Shared lib part of prog. */ 61 #define SLZMAGIC (MF_IS_SL | ZMAGIC) 62 63 /* Sl which uses another. */ 64 #define SLPZMAGIC (MF_USES_SL | SLZMAGIC) 65 66 #define N_SHARED_LIB(x) ((x).a_info & MF_USES_SL) 67 68 /* Only a pure OMAGIC file has the minimal header. */ 69 #define N_TXTOFF(x) \ 70 ((x).a_info == OMAGIC \ 71 ? 32 \ 72 : (N_MAGIC(x) == ZMAGIC \ 73 ? TARGET_PAGE_SIZE \ 74 : 999)) 75 76 #define N_TXTADDR(x) \ 77 (N_MAGIC(x) != ZMAGIC \ 78 ? (bfd_vma) 0 /* object file or NMAGIC */ \ 79 /* Programs with shared libs are loaded at the first page after all the \ 80 text segments of the shared library programs. Without looking this \ 81 up we can't know exactly what the address will be. A reasonable guess \ 82 is that a_entry will be in the first page of the executable. */ \ 83 : (N_SHARED_LIB(x) \ 84 ? ((x).a_entry & ~(bfd_vma) (TARGET_PAGE_SIZE - 1)) \ 85 : (bfd_vma) TEXT_START_ADDR)) 86 87 #define N_SYMOFF(x) \ 88 (N_TXTOFF (x) + (x).a_text + (x).a_data + (x).a_trsize + (x).a_drsize) 89 90 #define N_STROFF(x) (N_SYMOFF (x) + (x).a_syms) 91 92 #define TEXT_START_ADDR 32768 93 #define TARGET_PAGE_SIZE 32768 94 #define SEGMENT_SIZE TARGET_PAGE_SIZE 95 #define DEFAULT_ARCH bfd_arch_arm 96 97 /* Do not "beautify" the CONCAT* macro args. Traditional C will not 98 remove whitespace added here, and thus will fail to concatenate 99 the tokens. */ 100 #define MY(OP) CONCAT2 (arm_aout_riscix_,OP) 101 #define TARGETNAME "a.out-riscix" 102 #define N_BADMAG(x) ((((x).a_info & ~007200) != ZMAGIC) \ 103 && (((x).a_info & ~006000) != OMAGIC) \ 104 && ((x).a_info != NMAGIC)) 105 #define N_MAGIC(x) ((x).a_info & ~07200) 106 107 #include "sysdep.h" 108 #include "bfd.h" 109 #include "libbfd.h" 110 111 #define WRITE_HEADERS(abfd, execp) \ 112 { \ 113 bfd_size_type text_size; /* Dummy vars. */ \ 114 file_ptr text_end; \ 115 \ 116 if (adata (abfd).magic == undecided_magic) \ 117 NAME (aout, adjust_sizes_and_vmas) (abfd, & text_size, & text_end); \ 118 \ 119 execp->a_syms = bfd_get_symcount (abfd) * EXTERNAL_NLIST_SIZE; \ 120 execp->a_entry = bfd_get_start_address (abfd); \ 121 \ 122 execp->a_trsize = ((obj_textsec (abfd)->reloc_count) * \ 123 obj_reloc_entry_size (abfd)); \ 124 execp->a_drsize = ((obj_datasec (abfd)->reloc_count) * \ 125 obj_reloc_entry_size (abfd)); \ 126 NAME (aout, swap_exec_header_out) (abfd, execp, & exec_bytes); \ 127 \ 128 if (bfd_seek (abfd, (file_ptr) 0, SEEK_SET) != 0 \ 129 || bfd_bwrite ((void *) & exec_bytes, (bfd_size_type) EXEC_BYTES_SIZE, \ 130 abfd) != EXEC_BYTES_SIZE) \ 131 return FALSE; \ 132 /* Now write out reloc info, followed by syms and strings. */ \ 133 \ 134 if (bfd_get_outsymbols (abfd) != NULL \ 135 && bfd_get_symcount (abfd) != 0) \ 136 { \ 137 if (bfd_seek (abfd, (file_ptr) (N_SYMOFF (* execp)), SEEK_SET) != 0)\ 138 return FALSE; \ 139 \ 140 if (! NAME (aout, write_syms) (abfd)) \ 141 return FALSE; \ 142 \ 143 if (bfd_seek (abfd, (file_ptr) (N_TRELOFF (* execp)), SEEK_SET) != 0)\ 144 return FALSE; \ 145 \ 146 if (! riscix_squirt_out_relocs (abfd, obj_textsec (abfd))) \ 147 return FALSE; \ 148 if (bfd_seek (abfd, (file_ptr) (N_DRELOFF (* execp)), SEEK_SET) != 0)\ 149 return FALSE; \ 150 \ 151 if (!NAME (aout, squirt_out_relocs) (abfd, obj_datasec (abfd))) \ 152 return FALSE; \ 153 } \ 154 } 155 156 #include "libaout.h" 157 #include "aout/aout64.h" 158 159 static bfd_reloc_status_type 160 riscix_fix_pcrel_26_done (bfd *abfd ATTRIBUTE_UNUSED, 161 arelent *reloc_entry ATTRIBUTE_UNUSED, 162 asymbol *symbol ATTRIBUTE_UNUSED, 163 void * data ATTRIBUTE_UNUSED, 164 asection *input_section ATTRIBUTE_UNUSED, 165 bfd *output_bfd ATTRIBUTE_UNUSED, 166 char **error_message ATTRIBUTE_UNUSED) 167 { 168 /* This is dead simple at present. */ 169 return bfd_reloc_ok; 170 } 171 172 static bfd_reloc_status_type riscix_fix_pcrel_26 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **); 173 static const bfd_target *arm_aout_riscix_callback (bfd *); 174 175 static reloc_howto_type riscix_std_reloc_howto[] = 176 { 177 /* Type rs size bsz pcrel bitpos ovrf sf name part_inpl readmask setmask pcdone */ 178 HOWTO( 0, 0, 0, 8, FALSE, 0, complain_overflow_bitfield,0,"8", TRUE, 0x000000ff,0x000000ff, FALSE), 179 HOWTO( 1, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,0,"16", TRUE, 0x0000ffff,0x0000ffff, FALSE), 180 HOWTO( 2, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,0,"32", TRUE, 0xffffffff,0xffffffff, FALSE), 181 HOWTO( 3, 2, 3, 26, TRUE, 0, complain_overflow_signed, riscix_fix_pcrel_26 , "ARM26", TRUE, 0x00ffffff,0x00ffffff, FALSE), 182 HOWTO( 4, 0, 0, 8, TRUE, 0, complain_overflow_signed, 0,"DISP8", TRUE, 0x000000ff,0x000000ff, TRUE), 183 HOWTO( 5, 0, 1, 16, TRUE, 0, complain_overflow_signed, 0,"DISP16", TRUE, 0x0000ffff,0x0000ffff, TRUE), 184 HOWTO( 6, 0, 2, 32, TRUE, 0, complain_overflow_signed, 0,"DISP32", TRUE, 0xffffffff,0xffffffff, TRUE), 185 HOWTO( 7, 2, 3, 26, FALSE, 0, complain_overflow_signed, riscix_fix_pcrel_26_done, "ARM26D",TRUE,0x00ffffff,0x00ffffff, FALSE), 186 EMPTY_HOWTO (-1), 187 HOWTO( 9, 0, -1, 16, FALSE, 0, complain_overflow_bitfield,0,"NEG16", TRUE, 0x0000ffff,0x0000ffff, FALSE), 188 HOWTO( 10, 0, -2, 32, FALSE, 0, complain_overflow_bitfield,0,"NEG32", TRUE, 0xffffffff,0xffffffff, FALSE) 189 }; 190 191 #define RISCIX_TABLE_SIZE \ 192 (sizeof (riscix_std_reloc_howto) / sizeof (reloc_howto_type)) 193 194 static bfd_reloc_status_type 195 riscix_fix_pcrel_26 (bfd *abfd, 196 arelent *reloc_entry, 197 asymbol *symbol, 198 void * data, 199 asection *input_section, 200 bfd *output_bfd, 201 char **error_message ATTRIBUTE_UNUSED) 202 { 203 bfd_vma relocation; 204 bfd_size_type addr = reloc_entry->address; 205 long target = bfd_get_32 (abfd, (bfd_byte *) data + addr); 206 bfd_reloc_status_type flag = bfd_reloc_ok; 207 208 /* If this is an undefined symbol, return error. */ 209 if (bfd_is_und_section (symbol->section) 210 && (symbol->flags & BSF_WEAK) == 0) 211 return output_bfd ? bfd_reloc_continue : bfd_reloc_undefined; 212 213 /* If the sections are different, and we are doing a partial relocation, 214 just ignore it for now. */ 215 if (symbol->section->name != input_section->name 216 && output_bfd != NULL) 217 return bfd_reloc_continue; 218 219 relocation = (target & 0x00ffffff) << 2; 220 relocation = (relocation ^ 0x02000000) - 0x02000000; /* Sign extend. */ 221 relocation += symbol->value; 222 relocation += symbol->section->output_section->vma; 223 relocation += symbol->section->output_offset; 224 relocation += reloc_entry->addend; 225 relocation -= input_section->output_section->vma; 226 relocation -= input_section->output_offset; 227 relocation -= addr; 228 if (relocation & 3) 229 return bfd_reloc_overflow; 230 231 /* Check for overflow. */ 232 if (relocation & 0x02000000) 233 { 234 if ((relocation & ~ (bfd_vma) 0x03ffffff) != ~ (bfd_vma) 0x03ffffff) 235 flag = bfd_reloc_overflow; 236 } 237 else if (relocation & ~ (bfd_vma) 0x03ffffff) 238 flag = bfd_reloc_overflow; 239 240 target &= ~0x00ffffff; 241 target |= (relocation >> 2) & 0x00ffffff; 242 bfd_put_32 (abfd, (bfd_vma) target, (bfd_byte *) data + addr); 243 244 /* Now the ARM magic... Change the reloc type so that it is marked as done. 245 Strictly this is only necessary if we are doing a partial relocation. */ 246 reloc_entry->howto = &riscix_std_reloc_howto[7]; 247 248 return flag; 249 } 250 251 static reloc_howto_type * 252 riscix_reloc_type_lookup (bfd *abfd, bfd_reloc_code_real_type code) 253 { 254 #define ASTD(i,j) case i: return &riscix_std_reloc_howto[j] 255 if (code == BFD_RELOC_CTOR) 256 switch (bfd_arch_bits_per_address (abfd)) 257 { 258 case 32: 259 code = BFD_RELOC_32; 260 break; 261 default: 262 return NULL; 263 } 264 265 switch (code) 266 { 267 ASTD (BFD_RELOC_16, 1); 268 ASTD (BFD_RELOC_32, 2); 269 ASTD (BFD_RELOC_ARM_PCREL_BRANCH, 3); 270 ASTD (BFD_RELOC_8_PCREL, 4); 271 ASTD (BFD_RELOC_16_PCREL, 5); 272 ASTD (BFD_RELOC_32_PCREL, 6); 273 default: 274 return NULL; 275 } 276 } 277 278 static reloc_howto_type * 279 riscix_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, 280 const char *r_name) 281 { 282 unsigned int i; 283 284 for (i = 0; 285 i < sizeof (riscix_std_reloc_howto) / sizeof (riscix_std_reloc_howto[0]); 286 i++) 287 if (riscix_std_reloc_howto[i].name != NULL 288 && strcasecmp (riscix_std_reloc_howto[i].name, r_name) == 0) 289 return &riscix_std_reloc_howto[i]; 290 291 return NULL; 292 } 293 294 #define MY_bfd_link_hash_table_create _bfd_generic_link_hash_table_create 295 #define MY_bfd_link_add_symbols _bfd_generic_link_add_symbols 296 #define MY_final_link_callback should_not_be_used 297 #define MY_bfd_final_link _bfd_generic_final_link 298 299 #define MY_bfd_reloc_type_lookup riscix_reloc_type_lookup 300 #define MY_bfd_reloc_name_lookup riscix_reloc_name_lookup 301 #define MY_canonicalize_reloc arm_aout_riscix_canonicalize_reloc 302 #define MY_object_p arm_aout_riscix_object_p 303 304 static void 305 riscix_swap_std_reloc_out (bfd *abfd, 306 arelent *g, 307 struct reloc_std_external *natptr) 308 { 309 int r_index; 310 asymbol *sym = *(g->sym_ptr_ptr); 311 int r_extern; 312 int r_length; 313 int r_pcrel; 314 int r_neg = 0; /* Negative relocs use the BASEREL bit. */ 315 asection *output_section = sym->section->output_section; 316 317 PUT_WORD(abfd, g->address, natptr->r_address); 318 319 r_length = g->howto->size ; /* Size as a power of two. */ 320 if (r_length < 0) 321 { 322 r_length = -r_length; 323 r_neg = 1; 324 } 325 326 r_pcrel = (int) g->howto->pc_relative; /* Relative to PC? */ 327 328 /* For RISC iX, in pc-relative relocs the r_pcrel bit means that the 329 relocation has been done already (Only for the 26-bit one I think)? */ 330 if (r_length == 3) 331 r_pcrel = r_pcrel ? 0 : 1; 332 333 /* Name was clobbered by aout_write_syms to be symbol index. */ 334 335 /* If this relocation is relative to a symbol then set the 336 r_index to the symbols index, and the r_extern bit. 337 338 Absolute symbols can come in in two ways, either as an offset 339 from the abs section, or as a symbol which has an abs value. 340 check for that here. */ 341 342 if (bfd_is_com_section (output_section) 343 || bfd_is_abs_section (output_section) 344 || bfd_is_und_section (output_section)) 345 { 346 if (bfd_abs_section_ptr->symbol == sym) 347 { 348 /* Whoops, looked like an abs symbol, but is really an offset 349 from the abs section. */ 350 r_index = 0; 351 r_extern = 0; 352 } 353 else 354 { 355 /* Fill in symbol. */ 356 r_extern = 1; 357 r_index = (*g->sym_ptr_ptr)->udata.i; 358 } 359 } 360 else 361 { 362 /* Just an ordinary section. */ 363 r_extern = 0; 364 r_index = output_section->target_index; 365 } 366 367 /* Now the fun stuff. */ 368 if (bfd_header_big_endian (abfd)) 369 { 370 natptr->r_index[0] = r_index >> 16; 371 natptr->r_index[1] = r_index >> 8; 372 natptr->r_index[2] = r_index; 373 natptr->r_type[0] = 374 ( (r_extern ? RELOC_STD_BITS_EXTERN_BIG: 0) 375 | (r_pcrel ? RELOC_STD_BITS_PCREL_BIG: 0) 376 | (r_neg ? RELOC_STD_BITS_BASEREL_BIG: 0) 377 | (r_length << RELOC_STD_BITS_LENGTH_SH_BIG)); 378 } 379 else 380 { 381 natptr->r_index[2] = r_index >> 16; 382 natptr->r_index[1] = r_index >> 8; 383 natptr->r_index[0] = r_index; 384 natptr->r_type[0] = 385 ( (r_extern ? RELOC_STD_BITS_EXTERN_LITTLE: 0) 386 | (r_pcrel ? RELOC_STD_BITS_PCREL_LITTLE: 0) 387 | (r_neg ? RELOC_STD_BITS_BASEREL_LITTLE: 0) 388 | (r_length << RELOC_STD_BITS_LENGTH_SH_LITTLE)); 389 } 390 } 391 392 static bfd_boolean 393 riscix_squirt_out_relocs (bfd *abfd, asection *section) 394 { 395 arelent **generic; 396 unsigned char *native, *natptr; 397 size_t each_size; 398 unsigned int count = section->reloc_count; 399 bfd_size_type natsize; 400 401 if (count == 0) 402 return TRUE; 403 404 each_size = obj_reloc_entry_size (abfd); 405 natsize = each_size; 406 natsize *= count; 407 native = bfd_zalloc (abfd, natsize); 408 if (!native) 409 return FALSE; 410 411 generic = section->orelocation; 412 413 for (natptr = native; 414 count != 0; 415 --count, natptr += each_size, ++generic) 416 riscix_swap_std_reloc_out (abfd, *generic, 417 (struct reloc_std_external *) natptr); 418 419 if (bfd_bwrite ((void *) native, natsize, abfd) != natsize) 420 { 421 bfd_release (abfd, native); 422 return FALSE; 423 } 424 425 bfd_release (abfd, native); 426 return TRUE; 427 } 428 429 /* This is just like the standard aoutx.h version but we need to do our 430 own mapping of external reloc type values to howto entries. */ 431 432 static long 433 MY (canonicalize_reloc) (bfd *abfd, 434 sec_ptr section, 435 arelent **relptr, 436 asymbol **symbols) 437 { 438 arelent *tblptr = section->relocation; 439 unsigned int count, c; 440 extern reloc_howto_type NAME (aout, std_howto_table)[]; 441 442 /* If we have already read in the relocation table, return the values. */ 443 if (section->flags & SEC_CONSTRUCTOR) 444 { 445 arelent_chain *chain = section->constructor_chain; 446 447 for (count = 0; count < section->reloc_count; count++) 448 { 449 *relptr++ = &chain->relent; 450 chain = chain->next; 451 } 452 *relptr = 0; 453 return section->reloc_count; 454 } 455 456 if (tblptr && section->reloc_count) 457 { 458 for (count = 0; count++ < section->reloc_count;) 459 *relptr++ = tblptr++; 460 *relptr = 0; 461 return section->reloc_count; 462 } 463 464 if (!NAME (aout, slurp_reloc_table) (abfd, section, symbols)) 465 return -1; 466 tblptr = section->relocation; 467 468 /* Fix up howto entries. */ 469 for (count = 0; count++ < section->reloc_count;) 470 { 471 c = tblptr->howto - NAME(aout,std_howto_table); 472 BFD_ASSERT (c < RISCIX_TABLE_SIZE); 473 tblptr->howto = &riscix_std_reloc_howto[c]; 474 475 *relptr++ = tblptr++; 476 } 477 *relptr = 0; 478 return section->reloc_count; 479 } 480 481 /* This is the same as NAME(aout,some_aout_object_p), but has different 482 expansions of the macro definitions. */ 483 484 static const bfd_target * 485 riscix_some_aout_object_p (bfd *abfd, 486 struct internal_exec *execp, 487 const bfd_target *(*callback_to_real_object_p) (bfd *)) 488 { 489 struct aout_data_struct *rawptr, *oldrawptr; 490 const bfd_target *result; 491 bfd_size_type amt = sizeof (struct aout_data_struct); 492 493 rawptr = bfd_zalloc (abfd, amt); 494 495 if (rawptr == NULL) 496 return NULL; 497 498 oldrawptr = abfd->tdata.aout_data; 499 abfd->tdata.aout_data = rawptr; 500 501 /* Copy the contents of the old tdata struct. 502 In particular, we want the subformat, since for hpux it was set in 503 hp300hpux.c:swap_exec_header_in and will be used in 504 hp300hpux.c:callback. */ 505 if (oldrawptr != NULL) 506 *abfd->tdata.aout_data = *oldrawptr; 507 508 abfd->tdata.aout_data->a.hdr = &rawptr->e; 509 /* Copy in the internal_exec struct. */ 510 *(abfd->tdata.aout_data->a.hdr) = *execp; 511 execp = abfd->tdata.aout_data->a.hdr; 512 513 /* Set the file flags. */ 514 abfd->flags = BFD_NO_FLAGS; 515 if (execp->a_drsize || execp->a_trsize) 516 abfd->flags |= HAS_RELOC; 517 /* Setting of EXEC_P has been deferred to the bottom of this function. */ 518 if (execp->a_syms) 519 abfd->flags |= HAS_LINENO | HAS_DEBUG | HAS_SYMS | HAS_LOCALS; 520 if (N_DYNAMIC(*execp)) 521 abfd->flags |= DYNAMIC; 522 523 /* Squeezed files aren't supported (yet)! */ 524 if ((execp->a_info & MF_SQUEEZED) != 0) 525 { 526 bfd_set_error (bfd_error_wrong_format); 527 return NULL; 528 } 529 else if ((execp->a_info & MF_IS_SL) != 0) 530 { 531 /* Nor are shared libraries. */ 532 bfd_set_error (bfd_error_wrong_format); 533 return NULL; 534 } 535 else if (N_MAGIC (*execp) == ZMAGIC) 536 { 537 abfd->flags |= D_PAGED | WP_TEXT; 538 adata (abfd).magic = z_magic; 539 } 540 else if (N_MAGIC (*execp) == NMAGIC) 541 { 542 abfd->flags |= WP_TEXT; 543 adata (abfd).magic = n_magic; 544 } 545 else if (N_MAGIC (*execp) == OMAGIC) 546 adata (abfd).magic = o_magic; 547 else 548 /* Should have been checked with N_BADMAG before this routine 549 was called. */ 550 abort (); 551 552 bfd_get_start_address (abfd) = execp->a_entry; 553 554 obj_aout_symbols (abfd) = NULL; 555 bfd_get_symcount (abfd) = execp->a_syms / sizeof (struct external_nlist); 556 557 /* The default relocation entry size is that of traditional V7 Unix. */ 558 obj_reloc_entry_size (abfd) = RELOC_STD_SIZE; 559 560 /* The default symbol entry size is that of traditional Unix. */ 561 obj_symbol_entry_size (abfd) = EXTERNAL_NLIST_SIZE; 562 563 obj_aout_external_syms (abfd) = NULL; 564 obj_aout_external_strings (abfd) = NULL; 565 obj_aout_sym_hashes (abfd) = NULL; 566 567 if (! NAME (aout, make_sections) (abfd)) 568 return NULL; 569 570 obj_datasec (abfd)->size = execp->a_data; 571 obj_bsssec (abfd)->size = execp->a_bss; 572 573 obj_textsec (abfd)->flags = 574 (execp->a_trsize != 0 575 ? (SEC_ALLOC | SEC_LOAD | SEC_CODE | SEC_HAS_CONTENTS | SEC_RELOC) 576 : (SEC_ALLOC | SEC_LOAD | SEC_CODE | SEC_HAS_CONTENTS)); 577 obj_datasec (abfd)->flags = 578 (execp->a_drsize != 0 579 ? (SEC_ALLOC | SEC_LOAD | SEC_DATA | SEC_HAS_CONTENTS | SEC_RELOC) 580 : (SEC_ALLOC | SEC_LOAD | SEC_DATA | SEC_HAS_CONTENTS)); 581 obj_bsssec (abfd)->flags = SEC_ALLOC; 582 583 result = (*callback_to_real_object_p) (abfd); 584 585 #if defined(MACH) || defined(STAT_FOR_EXEC) 586 /* The original heuristic doesn't work in some important cases. The 587 a.out file has no information about the text start address. For 588 files (like kernels) linked to non-standard addresses (ld -Ttext 589 nnn) the entry point may not be between the default text start 590 (obj_textsec(abfd)->vma) and (obj_textsec(abfd)->vma) + text size 591 This is not just a mach issue. Many kernels are loaded at non 592 standard addresses. */ 593 { 594 struct stat stat_buf; 595 596 if (abfd->iostream != NULL 597 && (abfd->flags & BFD_IN_MEMORY) == 0 598 && (fstat(fileno((FILE *) (abfd->iostream)), &stat_buf) == 0) 599 && ((stat_buf.st_mode & 0111) != 0)) 600 abfd->flags |= EXEC_P; 601 } 602 #else /* ! MACH */ 603 /* Now that the segment addresses have been worked out, take a better 604 guess at whether the file is executable. If the entry point 605 is within the text segment, assume it is. (This makes files 606 executable even if their entry point address is 0, as long as 607 their text starts at zero.) 608 609 At some point we should probably break down and stat the file and 610 declare it executable if (one of) its 'x' bits are on... */ 611 if ((execp->a_entry >= obj_textsec(abfd)->vma) && 612 (execp->a_entry < obj_textsec(abfd)->vma + obj_textsec(abfd)->size)) 613 abfd->flags |= EXEC_P; 614 #endif /* MACH */ 615 if (result == NULL) 616 { 617 free (rawptr); 618 abfd->tdata.aout_data = oldrawptr; 619 } 620 return result; 621 } 622 623 static const bfd_target * 624 MY (object_p) (bfd *abfd) 625 { 626 struct external_exec exec_bytes; /* Raw exec header from file. */ 627 struct internal_exec exec; /* Cleaned-up exec header. */ 628 const bfd_target *target; 629 630 if (bfd_bread ((void *) &exec_bytes, (bfd_size_type) EXEC_BYTES_SIZE, abfd) 631 != EXEC_BYTES_SIZE) 632 { 633 if (bfd_get_error () != bfd_error_system_call) 634 bfd_set_error (bfd_error_wrong_format); 635 return NULL; 636 } 637 638 exec.a_info = H_GET_32 (abfd, exec_bytes.e_info); 639 640 if (N_BADMAG (exec)) 641 return NULL; 642 643 #ifdef MACHTYPE_OK 644 if (!(MACHTYPE_OK (N_MACHTYPE (exec)))) 645 return NULL; 646 #endif 647 648 NAME (aout, swap_exec_header_in) (abfd, & exec_bytes, & exec); 649 650 target = riscix_some_aout_object_p (abfd, & exec, MY (callback)); 651 652 return target; 653 } 654 655 #include "aout-target.h" 656
