1/* BFD back-end for RISC iX (Acorn, arm) binaries. 2 Copyright 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2004, 3 2005, 2007 Free Software Foundation, Inc. 4 Contributed by Richard Earnshaw (rwe@pegasus.esprit.ec.org) 5 6 This file is part of BFD, the Binary File Descriptor library. 7 8 This program is free software; you can redistribute it and/or modify 9 it under the terms of the GNU General Public License as published by 10 the Free Software Foundation; either version 3 of the License, or 11 (at your option) any later version. 12 13 This program is distributed in the hope that it will be useful, 14 but WITHOUT ANY WARRANTY; without even the implied warranty of 15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 GNU General Public License for more details. 17 18 You should have received a copy of the GNU General Public License 19 along with this program; if not, write to the Free Software 20 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, 21 MA 02110-1301, USA. */ 22 23 24/* RISC iX overloads the MAGIC field to indicate more than just the usual 25 [ZNO]MAGIC values. Also included are squeezing information and 26 shared library usage. */ 27 28/* The following come from the man page. */ 29#define SHLIBLEN 60 30 31#define MF_IMPURE 00200 32#define MF_SQUEEZED 01000 33#define MF_USES_SL 02000 34#define MF_IS_SL 04000 35 36/* Common combinations. */ 37 38/* Demand load (impure text). */ 39#define IMAGIC (MF_IMPURE | ZMAGIC) 40 41/* OMAGIC with large header. 42 May contain a ref to a shared lib required by the object. */ 43#define SPOMAGIC (MF_USES_SL | OMAGIC) 44 45/* A reference to a shared library. 46 The text portion of the object contains "overflow text" from 47 the shared library to be linked in with an object. */ 48#define SLOMAGIC (MF_IS_SL | OMAGIC) 49 50/* Sqeezed demand paged. 51 NOTE: This interpretation of QMAGIC seems to be at variance 52 with that used on other architectures. */ 53#define QMAGIC (MF_SQUEEZED | ZMAGIC) 54 55/* Program which uses sl. */ 56#define SPZMAGIC (MF_USES_SL | ZMAGIC) 57 58/* Sqeezed ditto. */ 59#define SPQMAGIC (MF_USES_SL | QMAGIC) 60 61/* Shared lib part of prog. */ 62#define SLZMAGIC (MF_IS_SL | ZMAGIC) 63 64/* Sl which uses another. */ 65#define SLPZMAGIC (MF_USES_SL | SLZMAGIC) 66 67#define N_SHARED_LIB(x) ((x).a_info & MF_USES_SL) 68 69/* Only a pure OMAGIC file has the minimal header. */ 70#define N_TXTOFF(x) \ 71 ((x).a_info == OMAGIC \ 72 ? 32 \ 73 : (N_MAGIC(x) == ZMAGIC \ 74 ? TARGET_PAGE_SIZE \ 75 : 999)) 76 77#define N_TXTADDR(x) \ 78 (N_MAGIC(x) != ZMAGIC \ 79 ? (bfd_vma) 0 /* object file or NMAGIC */ \ 80 /* Programs with shared libs are loaded at the first page after all the \ 81 text segments of the shared library programs. Without looking this \ 82 up we can't know exactly what the address will be. A reasonable guess \ 83 is that a_entry will be in the first page of the executable. */ \ 84 : (N_SHARED_LIB(x) \ 85 ? ((x).a_entry & ~(bfd_vma) (TARGET_PAGE_SIZE - 1)) \ 86 : (bfd_vma) TEXT_START_ADDR)) 87 88#define N_SYMOFF(x) \ 89 (N_TXTOFF (x) + (x).a_text + (x).a_data + (x).a_trsize + (x).a_drsize) 90 91#define N_STROFF(x) (N_SYMOFF (x) + (x).a_syms) 92 93#define TEXT_START_ADDR 32768 94#define TARGET_PAGE_SIZE 32768 95#define SEGMENT_SIZE TARGET_PAGE_SIZE 96#define DEFAULT_ARCH bfd_arch_arm 97 98/* Do not "beautify" the CONCAT* macro args. Traditional C will not 99 remove whitespace added here, and thus will fail to concatenate 100 the tokens. */ 101#define MY(OP) CONCAT2 (riscix_,OP) 102#define TARGETNAME "a.out-riscix" 103#define N_BADMAG(x) ((((x).a_info & ~007200) != ZMAGIC) \ 104 && (((x).a_info & ~006000) != OMAGIC) \ 105 && ((x).a_info != NMAGIC)) 106#define N_MAGIC(x) ((x).a_info & ~07200) 107 108#include "sysdep.h" 109#include "bfd.h" 110#include "libbfd.h" 111 112#define WRITE_HEADERS(abfd, execp) \ 113 { \ 114 bfd_size_type text_size; /* Dummy vars. */ \ 115 file_ptr text_end; \ 116 \ 117 if (adata (abfd).magic == undecided_magic) \ 118 NAME (aout, adjust_sizes_and_vmas) (abfd, & text_size, & text_end); \ 119 \ 120 execp->a_syms = bfd_get_symcount (abfd) * EXTERNAL_NLIST_SIZE; \ 121 execp->a_entry = bfd_get_start_address (abfd); \ 122 \ 123 execp->a_trsize = ((obj_textsec (abfd)->reloc_count) * \ 124 obj_reloc_entry_size (abfd)); \ 125 execp->a_drsize = ((obj_datasec (abfd)->reloc_count) * \ 126 obj_reloc_entry_size (abfd)); \ 127 NAME (aout, swap_exec_header_out) (abfd, execp, & exec_bytes); \ 128 \ 129 if (bfd_seek (abfd, (file_ptr) 0, SEEK_SET) != 0 \ 130 || bfd_bwrite ((void *) & exec_bytes, (bfd_size_type) EXEC_BYTES_SIZE, \ 131 abfd) != EXEC_BYTES_SIZE) \ 132 return FALSE; \ 133 /* Now write out reloc info, followed by syms and strings. */ \ 134 \ 135 if (bfd_get_outsymbols (abfd) != NULL \ 136 && bfd_get_symcount (abfd) != 0) \ 137 { \ 138 if (bfd_seek (abfd, (file_ptr) (N_SYMOFF (* execp)), SEEK_SET) != 0)\ 139 return FALSE; \ 140 \ 141 if (! NAME (aout, write_syms) (abfd)) \ 142 return FALSE; \ 143 \ 144 if (bfd_seek (abfd, (file_ptr) (N_TRELOFF (* execp)), SEEK_SET) != 0)\ 145 return FALSE; \ 146 \ 147 if (! riscix_squirt_out_relocs (abfd, obj_textsec (abfd))) \ 148 return FALSE; \ 149 if (bfd_seek (abfd, (file_ptr) (N_DRELOFF (* execp)), SEEK_SET) != 0)\ 150 return FALSE; \ 151 \ 152 if (!NAME (aout, squirt_out_relocs) (abfd, obj_datasec (abfd))) \ 153 return FALSE; \ 154 } \ 155 } 156 157#include "libaout.h" 158#include "aout/aout64.h" 159 160static bfd_reloc_status_type 161riscix_fix_pcrel_26_done (bfd *abfd ATTRIBUTE_UNUSED, 162 arelent *reloc_entry ATTRIBUTE_UNUSED, 163 asymbol *symbol ATTRIBUTE_UNUSED, 164 void * data ATTRIBUTE_UNUSED, 165 asection *input_section ATTRIBUTE_UNUSED, 166 bfd *output_bfd ATTRIBUTE_UNUSED, 167 char **error_message ATTRIBUTE_UNUSED) 168{ 169 /* This is dead simple at present. */ 170 return bfd_reloc_ok; 171} 172 173static bfd_reloc_status_type riscix_fix_pcrel_26 (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **); 174static const bfd_target *riscix_callback (bfd *); 175 176static reloc_howto_type riscix_std_reloc_howto[] = 177{ 178 /* Type rs size bsz pcrel bitpos ovrf sf name part_inpl readmask setmask pcdone */ 179 HOWTO( 0, 0, 0, 8, FALSE, 0, complain_overflow_bitfield,0,"8", TRUE, 0x000000ff,0x000000ff, FALSE), 180 HOWTO( 1, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,0,"16", TRUE, 0x0000ffff,0x0000ffff, FALSE), 181 HOWTO( 2, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,0,"32", TRUE, 0xffffffff,0xffffffff, FALSE), 182 HOWTO( 3, 2, 3, 26, TRUE, 0, complain_overflow_signed, riscix_fix_pcrel_26 , "ARM26", TRUE, 0x00ffffff,0x00ffffff, FALSE), 183 HOWTO( 4, 0, 0, 8, TRUE, 0, complain_overflow_signed, 0,"DISP8", TRUE, 0x000000ff,0x000000ff, TRUE), 184 HOWTO( 5, 0, 1, 16, TRUE, 0, complain_overflow_signed, 0,"DISP16", TRUE, 0x0000ffff,0x0000ffff, TRUE), 185 HOWTO( 6, 0, 2, 32, TRUE, 0, complain_overflow_signed, 0,"DISP32", TRUE, 0xffffffff,0xffffffff, TRUE), 186 HOWTO( 7, 2, 3, 26, FALSE, 0, complain_overflow_signed, riscix_fix_pcrel_26_done, "ARM26D",TRUE,0x00ffffff,0x00ffffff, FALSE), 187 EMPTY_HOWTO (-1), 188 HOWTO( 9, 0, -1, 16, FALSE, 0, complain_overflow_bitfield,0,"NEG16", TRUE, 0x0000ffff,0x0000ffff, FALSE), 189 HOWTO( 10, 0, -2, 32, FALSE, 0, complain_overflow_bitfield,0,"NEG32", TRUE, 0xffffffff,0xffffffff, FALSE) 190}; 191 192#define RISCIX_TABLE_SIZE \ 193 (sizeof (riscix_std_reloc_howto) / sizeof (reloc_howto_type)) 194 195static bfd_reloc_status_type 196riscix_fix_pcrel_26 (bfd *abfd, 197 arelent *reloc_entry, 198 asymbol *symbol, 199 void * data, 200 asection *input_section, 201 bfd *output_bfd, 202 char **error_message ATTRIBUTE_UNUSED) 203{ 204 bfd_vma relocation; 205 bfd_size_type addr = reloc_entry->address; 206 long target = bfd_get_32 (abfd, (bfd_byte *) data + addr); 207 bfd_reloc_status_type flag = bfd_reloc_ok; 208 209 /* If this is an undefined symbol, return error. */ 210 if (symbol->section == &bfd_und_section 211 && (symbol->flags & BSF_WEAK) == 0) 212 return output_bfd ? bfd_reloc_continue : bfd_reloc_undefined; 213 214 /* If the sections are different, and we are doing a partial relocation, 215 just ignore it for now. */ 216 if (symbol->section->name != input_section->name 217 && output_bfd != NULL) 218 return bfd_reloc_continue; 219 220 relocation = (target & 0x00ffffff) << 2; 221 relocation = (relocation ^ 0x02000000) - 0x02000000; /* Sign extend. */ 222 relocation += symbol->value; 223 relocation += symbol->section->output_section->vma; 224 relocation += symbol->section->output_offset; 225 relocation += reloc_entry->addend; 226 relocation -= input_section->output_section->vma; 227 relocation -= input_section->output_offset; 228 relocation -= addr; 229 if (relocation & 3) 230 return bfd_reloc_overflow; 231 232 /* Check for overflow. */ 233 if (relocation & 0x02000000) 234 { 235 if ((relocation & ~ (bfd_vma) 0x03ffffff) != ~ (bfd_vma) 0x03ffffff) 236 flag = bfd_reloc_overflow; 237 } 238 else if (relocation & ~ (bfd_vma) 0x03ffffff) 239 flag = bfd_reloc_overflow; 240 241 target &= ~0x00ffffff; 242 target |= (relocation >> 2) & 0x00ffffff; 243 bfd_put_32 (abfd, (bfd_vma) target, (bfd_byte *) data + addr); 244 245 /* Now the ARM magic... Change the reloc type so that it is marked as done. 246 Strictly this is only necessary if we are doing a partial relocation. */ 247 reloc_entry->howto = &riscix_std_reloc_howto[7]; 248 249 return flag; 250} 251 252static reloc_howto_type * 253riscix_reloc_type_lookup (bfd *abfd, bfd_reloc_code_real_type code) 254{ 255#define ASTD(i,j) case i: return &riscix_std_reloc_howto[j] 256 if (code == BFD_RELOC_CTOR) 257 switch (bfd_get_arch_info (abfd)->bits_per_address) 258 { 259 case 32: 260 code = BFD_RELOC_32; 261 break; 262 default: 263 return NULL; 264 } 265 266 switch (code) 267 { 268 ASTD (BFD_RELOC_16, 1); 269 ASTD (BFD_RELOC_32, 2); 270 ASTD (BFD_RELOC_ARM_PCREL_BRANCH, 3); 271 ASTD (BFD_RELOC_8_PCREL, 4); 272 ASTD (BFD_RELOC_16_PCREL, 5); 273 ASTD (BFD_RELOC_32_PCREL, 6); 274 default: 275 return NULL; 276 } 277} 278 279static reloc_howto_type * 280riscix_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, 281 const char *r_name) 282{ 283 unsigned int i; 284 285 for (i = 0; 286 i < sizeof (riscix_std_reloc_howto) / sizeof (riscix_std_reloc_howto[0]); 287 i++) 288 if (riscix_std_reloc_howto[i].name != NULL 289 && strcasecmp (riscix_std_reloc_howto[i].name, r_name) == 0) 290 return &riscix_std_reloc_howto[i]; 291 292 return NULL; 293} 294 295#define MY_bfd_link_hash_table_create _bfd_generic_link_hash_table_create 296#define MY_bfd_link_add_symbols _bfd_generic_link_add_symbols 297#define MY_final_link_callback should_not_be_used 298#define MY_bfd_final_link _bfd_generic_final_link 299 300#define MY_bfd_reloc_type_lookup riscix_reloc_type_lookup 301#define MY_bfd_reloc_name_lookup riscix_reloc_name_lookup 302#define MY_canonicalize_reloc riscix_canonicalize_reloc 303#define MY_object_p riscix_object_p 304 305static void 306riscix_swap_std_reloc_out (bfd *abfd, 307 arelent *g, 308 struct reloc_std_external *natptr) 309{ 310 int r_index; 311 asymbol *sym = *(g->sym_ptr_ptr); 312 int r_extern; 313 int r_length; 314 int r_pcrel; 315 int r_neg = 0; /* Negative relocs use the BASEREL bit. */ 316 asection *output_section = sym->section->output_section; 317 318 PUT_WORD(abfd, g->address, natptr->r_address); 319 320 r_length = g->howto->size ; /* Size as a power of two. */ 321 if (r_length < 0) 322 { 323 r_length = -r_length; 324 r_neg = 1; 325 } 326 327 r_pcrel = (int) g->howto->pc_relative; /* Relative to PC? */ 328 329 /* For RISC iX, in pc-relative relocs the r_pcrel bit means that the 330 relocation has been done already (Only for the 26-bit one I think)? */ 331 if (r_length == 3) 332 r_pcrel = r_pcrel ? 0 : 1; 333 334 /* Name was clobbered by aout_write_syms to be symbol index. */ 335 336 /* If this relocation is relative to a symbol then set the 337 r_index to the symbols index, and the r_extern bit. 338 339 Absolute symbols can come in in two ways, either as an offset 340 from the abs section, or as a symbol which has an abs value. 341 check for that here. */ 342 343 if (bfd_is_com_section (output_section) 344 || output_section == & bfd_abs_section 345 || output_section == & bfd_und_section) 346 { 347 if (bfd_abs_section.symbol == sym) 348 { 349 /* Whoops, looked like an abs symbol, but is really an offset 350 from the abs section. */ 351 r_index = 0; 352 r_extern = 0; 353 } 354 else 355 { 356 /* Fill in symbol. */ 357 r_extern = 1; 358 r_index = (*g->sym_ptr_ptr)->udata.i; 359 } 360 } 361 else 362 { 363 /* Just an ordinary section. */ 364 r_extern = 0; 365 r_index = output_section->target_index; 366 } 367 368 /* Now the fun stuff. */ 369 if (bfd_header_big_endian (abfd)) 370 { 371 natptr->r_index[0] = r_index >> 16; 372 natptr->r_index[1] = r_index >> 8; 373 natptr->r_index[2] = r_index; 374 natptr->r_type[0] = 375 ( (r_extern ? RELOC_STD_BITS_EXTERN_BIG: 0) 376 | (r_pcrel ? RELOC_STD_BITS_PCREL_BIG: 0) 377 | (r_neg ? RELOC_STD_BITS_BASEREL_BIG: 0) 378 | (r_length << RELOC_STD_BITS_LENGTH_SH_BIG)); 379 } 380 else 381 { 382 natptr->r_index[2] = r_index >> 16; 383 natptr->r_index[1] = r_index >> 8; 384 natptr->r_index[0] = r_index; 385 natptr->r_type[0] = 386 ( (r_extern ? RELOC_STD_BITS_EXTERN_LITTLE: 0) 387 | (r_pcrel ? RELOC_STD_BITS_PCREL_LITTLE: 0) 388 | (r_neg ? RELOC_STD_BITS_BASEREL_LITTLE: 0) 389 | (r_length << RELOC_STD_BITS_LENGTH_SH_LITTLE)); 390 } 391} 392 393static bfd_boolean 394riscix_squirt_out_relocs (bfd *abfd, asection *section) 395{ 396 arelent **generic; 397 unsigned char *native, *natptr; 398 size_t each_size; 399 unsigned int count = section->reloc_count; 400 bfd_size_type natsize; 401 402 if (count == 0) 403 return TRUE; 404 405 each_size = obj_reloc_entry_size (abfd); 406 natsize = each_size; 407 natsize *= count; 408 native = bfd_zalloc (abfd, natsize); 409 if (!native) 410 return FALSE; 411 412 generic = section->orelocation; 413 414 for (natptr = native; 415 count != 0; 416 --count, natptr += each_size, ++generic) 417 riscix_swap_std_reloc_out (abfd, *generic, 418 (struct reloc_std_external *) natptr); 419 420 if (bfd_bwrite ((void *) native, natsize, abfd) != natsize) 421 { 422 bfd_release (abfd, native); 423 return FALSE; 424 } 425 426 bfd_release (abfd, native); 427 return TRUE; 428} 429 430/* This is just like the standard aoutx.h version but we need to do our 431 own mapping of external reloc type values to howto entries. */ 432 433static long 434MY (canonicalize_reloc) (bfd *abfd, 435 sec_ptr section, 436 arelent **relptr, 437 asymbol **symbols) 438{ 439 arelent *tblptr = section->relocation; 440 unsigned int count, c; 441 extern reloc_howto_type NAME (aout, std_howto_table)[]; 442 443 /* If we have already read in the relocation table, return the values. */ 444 if (section->flags & SEC_CONSTRUCTOR) 445 { 446 arelent_chain *chain = section->constructor_chain; 447 448 for (count = 0; count < section->reloc_count; count++) 449 { 450 *relptr++ = &chain->relent; 451 chain = chain->next; 452 } 453 *relptr = 0; 454 return section->reloc_count; 455 } 456 457 if (tblptr && section->reloc_count) 458 { 459 for (count = 0; count++ < section->reloc_count;) 460 *relptr++ = tblptr++; 461 *relptr = 0; 462 return section->reloc_count; 463 } 464 465 if (!NAME (aout, slurp_reloc_table) (abfd, section, symbols)) 466 return -1; 467 tblptr = section->relocation; 468 469 /* Fix up howto entries. */ 470 for (count = 0; count++ < section->reloc_count;) 471 { 472 c = tblptr->howto - NAME(aout,std_howto_table); 473 BFD_ASSERT (c < RISCIX_TABLE_SIZE); 474 tblptr->howto = &riscix_std_reloc_howto[c]; 475 476 *relptr++ = tblptr++; 477 } 478 *relptr = 0; 479 return section->reloc_count; 480} 481 482/* This is the same as NAME(aout,some_aout_object_p), but has different 483 expansions of the macro definitions. */ 484 485static const bfd_target * 486riscix_some_aout_object_p (bfd *abfd, 487 struct internal_exec *execp, 488 const bfd_target *(*callback_to_real_object_p) (bfd *)) 489{ 490 struct aout_data_struct *rawptr, *oldrawptr; 491 const bfd_target *result; 492 bfd_size_type amt = sizeof (struct aout_data_struct); 493 494 rawptr = bfd_zalloc (abfd, amt); 495 496 if (rawptr == NULL) 497 return NULL; 498 499 oldrawptr = abfd->tdata.aout_data; 500 abfd->tdata.aout_data = rawptr; 501 502 /* Copy the contents of the old tdata struct. 503 In particular, we want the subformat, since for hpux it was set in 504 hp300hpux.c:swap_exec_header_in and will be used in 505 hp300hpux.c:callback. */ 506 if (oldrawptr != NULL) 507 *abfd->tdata.aout_data = *oldrawptr; 508 509 abfd->tdata.aout_data->a.hdr = &rawptr->e; 510 /* Copy in the internal_exec struct. */ 511 *(abfd->tdata.aout_data->a.hdr) = *execp; 512 execp = abfd->tdata.aout_data->a.hdr; 513 514 /* Set the file flags. */ 515 abfd->flags = BFD_NO_FLAGS; 516 if (execp->a_drsize || execp->a_trsize) 517 abfd->flags |= HAS_RELOC; 518 /* Setting of EXEC_P has been deferred to the bottom of this function. */ 519 if (execp->a_syms) 520 abfd->flags |= HAS_LINENO | HAS_DEBUG | HAS_SYMS | HAS_LOCALS; 521 if (N_DYNAMIC(*execp)) 522 abfd->flags |= DYNAMIC; 523 524 /* Squeezed files aren't supported (yet)! */ 525 if ((execp->a_info & MF_SQUEEZED) != 0) 526 { 527 bfd_set_error (bfd_error_wrong_format); 528 return NULL; 529 } 530 else if ((execp->a_info & MF_IS_SL) != 0) 531 { 532 /* Nor are shared libraries. */ 533 bfd_set_error (bfd_error_wrong_format); 534 return NULL; 535 } 536 else if (N_MAGIC (*execp) == ZMAGIC) 537 { 538 abfd->flags |= D_PAGED | WP_TEXT; 539 adata (abfd).magic = z_magic; 540 } 541 else if (N_MAGIC (*execp) == NMAGIC) 542 { 543 abfd->flags |= WP_TEXT; 544 adata (abfd).magic = n_magic; 545 } 546 else if (N_MAGIC (*execp) == OMAGIC) 547 adata (abfd).magic = o_magic; 548 else 549 /* Should have been checked with N_BADMAG before this routine 550 was called. */ 551 abort (); 552 553 bfd_get_start_address (abfd) = execp->a_entry; 554 555 obj_aout_symbols (abfd) = NULL; 556 bfd_get_symcount (abfd) = execp->a_syms / sizeof (struct external_nlist); 557 558 /* The default relocation entry size is that of traditional V7 Unix. */ 559 obj_reloc_entry_size (abfd) = RELOC_STD_SIZE; 560 561 /* The default symbol entry size is that of traditional Unix. */ 562 obj_symbol_entry_size (abfd) = EXTERNAL_NLIST_SIZE; 563 564 obj_aout_external_syms (abfd) = NULL; 565 obj_aout_external_strings (abfd) = NULL; 566 obj_aout_sym_hashes (abfd) = NULL; 567 568 if (! NAME (aout, make_sections) (abfd)) 569 return NULL; 570 571 obj_datasec (abfd)->size = execp->a_data; 572 obj_bsssec (abfd)->size = execp->a_bss; 573 574 obj_textsec (abfd)->flags = 575 (execp->a_trsize != 0 576 ? (SEC_ALLOC | SEC_LOAD | SEC_CODE | SEC_HAS_CONTENTS | SEC_RELOC) 577 : (SEC_ALLOC | SEC_LOAD | SEC_CODE | SEC_HAS_CONTENTS)); 578 obj_datasec (abfd)->flags = 579 (execp->a_drsize != 0 580 ? (SEC_ALLOC | SEC_LOAD | SEC_DATA | SEC_HAS_CONTENTS | SEC_RELOC) 581 : (SEC_ALLOC | SEC_LOAD | SEC_DATA | SEC_HAS_CONTENTS)); 582 obj_bsssec (abfd)->flags = SEC_ALLOC; 583 584 result = (*callback_to_real_object_p) (abfd); 585 586#if defined(MACH) || defined(STAT_FOR_EXEC) 587 /* The original heuristic doesn't work in some important cases. The 588 a.out file has no information about the text start address. For 589 files (like kernels) linked to non-standard addresses (ld -Ttext 590 nnn) the entry point may not be between the default text start 591 (obj_textsec(abfd)->vma) and (obj_textsec(abfd)->vma) + text size 592 This is not just a mach issue. Many kernels are loaded at non 593 standard addresses. */ 594 { 595 struct stat stat_buf; 596 597 if (abfd->iostream != NULL 598 && (abfd->flags & BFD_IN_MEMORY) == 0 599 && (fstat(fileno((FILE *) (abfd->iostream)), &stat_buf) == 0) 600 && ((stat_buf.st_mode & 0111) != 0)) 601 abfd->flags |= EXEC_P; 602 } 603#else /* ! MACH */ 604 /* Now that the segment addresses have been worked out, take a better 605 guess at whether the file is executable. If the entry point 606 is within the text segment, assume it is. (This makes files 607 executable even if their entry point address is 0, as long as 608 their text starts at zero.) 609 610 At some point we should probably break down and stat the file and 611 declare it executable if (one of) its 'x' bits are on... */ 612 if ((execp->a_entry >= obj_textsec(abfd)->vma) && 613 (execp->a_entry < obj_textsec(abfd)->vma + obj_textsec(abfd)->size)) 614 abfd->flags |= EXEC_P; 615#endif /* MACH */ 616 if (result == NULL) 617 { 618 free (rawptr); 619 abfd->tdata.aout_data = oldrawptr; 620 } 621 return result; 622} 623 624static const bfd_target * 625MY (object_p) (bfd *abfd) 626{ 627 struct external_exec exec_bytes; /* Raw exec header from file. */ 628 struct internal_exec exec; /* Cleaned-up exec header. */ 629 const bfd_target *target; 630 631 if (bfd_bread ((void *) &exec_bytes, (bfd_size_type) EXEC_BYTES_SIZE, abfd) 632 != EXEC_BYTES_SIZE) 633 { 634 if (bfd_get_error () != bfd_error_system_call) 635 bfd_set_error (bfd_error_wrong_format); 636 return NULL; 637 } 638 639 exec.a_info = H_GET_32 (abfd, exec_bytes.e_info); 640 641 if (N_BADMAG (exec)) 642 return NULL; 643 644#ifdef MACHTYPE_OK 645 if (!(MACHTYPE_OK (N_MACHTYPE (exec)))) 646 return NULL; 647#endif 648 649 NAME (aout, swap_exec_header_in) (abfd, & exec_bytes, & exec); 650 651 target = riscix_some_aout_object_p (abfd, & exec, MY (callback)); 652 653 return target; 654} 655 656#include "aout-target.h" 657