include/coff/xcoff.h

   1 /* Internal format of XCOFF object file data structures for BFD.
   2
   3    Copyright 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2005
   4    Free Software Foundation, Inc.
   5    Written by Ian Lance Taylor <ian@cygnus.com>, Cygnus Support.
   6
   7    This file is part of BFD, the Binary File Descriptor library.
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 2 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program; if not, write to the Free Software
  21    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.  */
  22
  23 #ifndef _INTERNAL_XCOFF_H
  24 #define _INTERNAL_XCOFF_H
  25
  26 /* Linker */
  27
  28 /* Names of "special" sections.  */
  29 #define _TEXT   ".text"
  30 #define _DATA   ".data"
  31 #define _BSS    ".bss"
  32 #define _PAD    ".pad"
  33 #define _LOADER ".loader"
  34 #define _EXCEPT ".except"
  35 #define _TYPCHK ".typchk"
  36
  37 /* XCOFF uses a special .loader section with type STYP_LOADER.  */
  38 #define STYP_LOADER 0x1000
  39
  40 /* XCOFF uses a special .debug section with type STYP_DEBUG.  */
  41 #define STYP_DEBUG 0x2000
  42
  43 /* XCOFF handles line number or relocation overflow by creating
  44    another section header with STYP_OVRFLO set.  */
  45 #define STYP_OVRFLO 0x8000
  46
  47 /* Specifies an exception section.  A section of this type provides
  48    information to identify the reason that a trap or ececptin occured within
  49    and executable object program */
  50 #define STYP_EXCEPT 0x0100
  51
  52 /* Specifies a type check section.  A section of this type contains parameter
  53    argument type check strings used by the AIX binder.  */
  54 #define STYP_TYPCHK 0x4000
  55
  56 #define RS6K_AOUTHDR_OMAGIC 0x0107 /* old: text & data writeable */
  57 #define RS6K_AOUTHDR_NMAGIC 0x0108 /* new: text r/o, data r/w */
  58 #define RS6K_AOUTHDR_ZMAGIC 0x010B /* paged: text r/o, both page-aligned */
  59
  60 /* XCOFF relocation types.
  61    The relocations are described in the function
  62    xcoff[64]_ppc_relocate_section in coff64-rs6000.c and coff-rs6000.c  */
  63
  64 #define R_POS   (0x00)
  65 #define R_NEG   (0x01)
  66 #define R_REL   (0x02)
  67 #define R_TOC   (0x03)
  68 #define R_RTB   (0x04)
  69 #define R_GL    (0x05)
  70 #define R_TCL   (0x06)
  71 #define R_BA    (0x08)
  72 #define R_BR    (0x0a)
  73 #define R_RL    (0x0c)
  74 #define R_RLA   (0x0d)
  75 #define R_REF   (0x0f)
  76 #define R_TRL   (0x12)
  77 #define R_TRLA  (0x13)
  78 #define R_RRTBI (0x14)
  79 #define R_RRTBA (0x15)
  80 #define R_CAI   (0x16)
  81 #define R_CREL  (0x17)
  82 #define R_RBA   (0x18)
  83 #define R_RBAC  (0x19)
  84 #define R_RBR   (0x1a)
  85 #define R_RBRC  (0x1b)
  86
  87 /* Storage class #defines, from /usr/include/storclass.h that are not already
  88    defined in internal.h */
  89
  90 /* Comment string in .info section */
  91 #define C_INFO          110
  92
  93 /* Auxillary Symbol Entries  */
  94
  95 /* x_smtyp values:  */
  96 #define SMTYP_ALIGN(x)  ((x) >> 3)      /* log2 of alignment */
  97 #define SMTYP_SMTYP(x)  ((x) & 0x7)     /* symbol type */
  98 /* Symbol type values:  */
  99 #define XTY_ER  0               /* External reference */
 100 #define XTY_SD  1               /* Csect definition */
 101 #define XTY_LD  2               /* Label definition */
 102 #define XTY_CM  3               /* .BSS */
 103 #define XTY_EM  4               /* Error message */
 104 #define XTY_US  5               /* "Reserved for internal use" */
 105
 106 /* x_smclas values:  */
 107 #define XMC_PR  0               /* Read-only program code */
 108 #define XMC_RO  1               /* Read-only constant */
 109 #define XMC_DB  2               /* Read-only debug dictionary table */
 110 #define XMC_TC  3               /* Read-write general TOC entry */
 111 #define XMC_UA  4               /* Read-write unclassified */
 112 #define XMC_RW  5               /* Read-write data */
 113 #define XMC_GL  6               /* Read-only global linkage */
 114 #define XMC_XO  7               /* Read-only extended operation */
 115 #define XMC_SV  8               /* Read-only supervisor call */
 116 #define XMC_BS  9               /* Read-write BSS */
 117 #define XMC_DS  10              /* Read-write descriptor csect */
 118 #define XMC_UC  11              /* Read-write unnamed Fortran common */
 119 #define XMC_TI  12              /* Read-only traceback index csect */
 120 #define XMC_TB  13              /* Read-only traceback table csect */
 121 /*              14      ??? */
 122 #define XMC_TC0 15              /* Read-write TOC anchor */
 123 #define XMC_TD  16              /* Read-write data in TOC */
 124 #define XMC_SV64   17           /* Read-only 64 bit supervisor call */
 125 #define XMC_SV3264 18           /* Read-only 32 or 64 bit supervisor call */
 126
 127 /* The ldhdr structure.  This appears at the start of the .loader
 128    section.  */
 129
 130 struct internal_ldhdr
 131 {
 132   /* The version number:
 133      1 : 32 bit
 134      2 : 64 bit */
 135   unsigned long l_version;
 136
 137   /* The number of symbol table entries.  */
 138   bfd_size_type l_nsyms;
 139
 140   /* The number of relocation table entries.  */
 141   bfd_size_type l_nreloc;
 142
 143   /* The length of the import file string table.  */
 144   bfd_size_type l_istlen;
 145
 146   /* The number of import files.  */
 147   bfd_size_type l_nimpid;
 148
 149   /* The offset from the start of the .loader section to the first
 150      entry in the import file table.  */
 151   bfd_size_type l_impoff;
 152
 153   /* The length of the string table.  */
 154   bfd_size_type l_stlen;
 155
 156   /* The offset from the start of the .loader section to the first
 157      entry in the string table.  */
 158   bfd_size_type l_stoff;
 159
 160   /* The offset to start of the symbol table, only in XCOFF64 */
 161   bfd_vma l_symoff;
 162
 163   /* The offset to the start of the relocation table, only in XCOFF64 */
 164   bfd_vma l_rldoff;
 165 };
 166
 167 /* The ldsym structure.  This is used to represent a symbol in the
 168    .loader section.  */
 169
 170 struct internal_ldsym
 171 {
 172   union
 173   {
 174     /* The symbol name if <= SYMNMLEN characters.  */
 175     char _l_name[SYMNMLEN];
 176     struct
 177     {
 178       /* Zero if the symbol name is more than SYMNMLEN characters.  */
 179         long _l_zeroes;
 180
 181       /* The offset in the string table if the symbol name is more
 182          than SYMNMLEN characters.  */
 183       long _l_offset;
 184     }
 185     _l_l;
 186   }
 187   _l;
 188
 189   /* The symbol value.  */
 190   bfd_vma l_value;
 191
 192   /* The symbol section number.  */
 193   short l_scnum;
 194
 195   /* The symbol type and flags.  */
 196   char l_smtype;
 197
 198   /* The symbol storage class.  */
 199   char l_smclas;
 200
 201   /* The import file ID.  */
 202   bfd_size_type l_ifile;
 203
 204   /* Offset to the parameter type check string.  */
 205   bfd_size_type l_parm;
 206 };
 207
 208 /* These flags are for the l_smtype field (the lower three bits are an
 209    XTY_* value).  */
 210
 211 /* Imported symbol.  */
 212 #define L_IMPORT (0x40)
 213 /* Entry point.  */
 214 #define L_ENTRY (0x20)
 215 /* Exported symbol.  */
 216 #define L_EXPORT (0x10)
 217 /* Weak symbol.  */
 218 #define L_WEAK (0x08)
 219
 220 /* The ldrel structure.  This is used to represent a reloc in the
 221    .loader section.  */
 222
 223 struct internal_ldrel
 224 {
 225   /* The reloc address.  */
 226   bfd_vma l_vaddr;
 227
 228   /* The symbol table index in the .loader section symbol table.  */
 229   bfd_size_type l_symndx;
 230
 231   /* The relocation type and size.  */
 232   short l_rtype;
 233
 234   /* The section number this relocation applies to.  */
 235   short l_rsecnm;
 236 };
 237
 238 /* An entry in the XCOFF linker hash table.  */
 239 struct xcoff_link_hash_entry
 240 {
 241   struct bfd_link_hash_entry root;
 242
 243   /* Symbol index in output file.  Set to -1 initially.  Set to -2 if
 244      there is a reloc against this symbol.  */
 245   long indx;
 246
 247   /* If we have created a TOC entry for this symbol, this is the .tc
 248      section which holds it.  */
 249   asection *toc_section;
 250
 251   union
 252   {
 253     /* If we have created a TOC entry (the XCOFF_SET_TOC flag is
 254        set), this is the offset in toc_section.  */
 255     bfd_vma toc_offset;
 256
 257     /* If the TOC entry comes from an input file, this is set to the
 258        symbol index of the C_HIDEXT XMC_TC or XMC_TD symbol.  */
 259     long toc_indx;
 260   }
 261   u;
 262
 263   /* If this symbol is a function entry point which is called, this
 264      field holds a pointer to the function descriptor.  If this symbol
 265      is a function descriptor, this field holds a pointer to the
 266      function entry point.  */
 267   struct xcoff_link_hash_entry *descriptor;
 268
 269   /* The .loader symbol table entry, if there is one.  */
 270   struct internal_ldsym *ldsym;
 271
 272   /* If XCOFF_BUILT_LDSYM is set, this is the .loader symbol table
 273      index.  If XCOFF_BUILD_LDSYM is clear, and XCOFF_IMPORT is set,
 274      this is the l_ifile value.  */
 275   long ldindx;
 276
 277   /* Some linker flags.  */
 278   unsigned long flags;
 279
 280   /* The storage mapping class.  */
 281   unsigned char smclas;
 282 };
 283
 284 /*  Flags for xcoff_link_hash_entry.  */
 285
 286 /* Symbol is referenced by a regular object. */
 287 #define XCOFF_REF_REGULAR      0x00000001
 288 /* Symbol is defined by a regular object. */
 289 #define XCOFF_DEF_REGULAR      0x00000002
 290 /* Symbol is defined by a dynamic object. */
 291 #define XCOFF_DEF_DYNAMIC      0x00000004
 292 /* Symbol is used in a reloc being copied into the .loader section.  */
 293 #define XCOFF_LDREL            0x00000008
 294 /* Symbol is the entry point.  */
 295 #define XCOFF_ENTRY            0x00000010
 296 /* Symbol is for a function and is the target of a relocation.
 297    The relocation may or may not be a branch-type relocation.  */
 298 #define XCOFF_CALLED           0x00000020
 299 /* Symbol needs the TOC entry filled in.  */
 300 #define XCOFF_SET_TOC          0x00000040
 301 /* Symbol is implicitly or explicitly imported.  */
 302 #define XCOFF_IMPORT           0x00000080
 303 /* Symbol is explicitly exported.  */
 304 #define XCOFF_EXPORT           0x00000100
 305 /* Symbol has been processed by xcoff_build_ldsyms.  */
 306 #define XCOFF_BUILT_LDSYM      0x00000200
 307 /* Symbol is mentioned by a section which was not garbage collected. */
 308 #define XCOFF_MARK             0x00000400
 309 /* Symbol size is recorded in size_list list from hash table.  */
 310 #define XCOFF_HAS_SIZE         0x00000800
 311 /* Symbol is a function descriptor.  */
 312 #define XCOFF_DESCRIPTOR       0x00001000
 313 /* Multiple definitions have been for the symbol. */
 314 #define XCOFF_MULTIPLY_DEFINED 0x00002000
 315 /* Symbol is the __rtinit symbol.  */
 316 #define XCOFF_RTINIT           0x00004000
 317 /* Symbol is an imported 32 bit syscall.  */
 318 #define XCOFF_SYSCALL32        0x00008000
 319 /* Symbol is an imported 64 bit syscall.  */
 320 #define XCOFF_SYSCALL64        0x00010000
 321 /* Symbol was not explicitly defined by the time it was marked.  */
 322 #define XCOFF_WAS_UNDEFINED    0x00020000
 323 /* We have assigned an output XCOFF entry to this symbol.  */
 324 #define XCOFF_ALLOCATED        0x00040000
 325
 326 /* The XCOFF linker hash table.  */
 327
 328 #define XCOFF_NUMBER_OF_SPECIAL_SECTIONS 6
 329 #define XCOFF_SPECIAL_SECTION_TEXT       0
 330 #define XCOFF_SPECIAL_SECTION_ETEXT      1
 331 #define XCOFF_SPECIAL_SECTION_DATA       2
 332 #define XCOFF_SPECIAL_SECTION_EDATA      3
 333 #define XCOFF_SPECIAL_SECTION_END        4
 334 #define XCOFF_SPECIAL_SECTION_END2       5
 335
 336 /* These flags indicate which of -bexpall and -bexpfull are in effect.  */
 337 #define XCOFF_EXPALL 1
 338 #define XCOFF_EXPFULL 2
 339
 340 /* This structure is used to pass information through
 341    xcoff_link_hash_traverse.  */
 342
 343 struct xcoff_loader_info
 344 {
 345   /* Set if a problem occurred.  */
 346   bfd_boolean failed;
 347
 348   /* Output BFD.  */
 349   bfd *output_bfd;
 350
 351   /* Link information structure.  */
 352   struct bfd_link_info *info;
 353
 354   /* A mask of XCOFF_EXPALL and XCOFF_EXPFULL flags.  */
 355   unsigned int auto_export_flags;
 356
 357   /* Number of ldsym structures.  */
 358   size_t ldsym_count;
 359
 360   /* Size of string table.  */
 361   size_t string_size;
 362
 363   /* String table.  */
 364   char *strings;
 365
 366   /* Allocated size of string table.  */
 367   size_t string_alc;
 368 };
 369
 370 /* In case we're on a 32-bit machine, construct a 64-bit "-1" value
 371    from smaller values.  Start with zero, widen, *then* decrement.  */
 372 #define MINUS_ONE       (((bfd_vma) 0) - 1)
 373
 374 /* __rtinit, from /usr/include/rtinit.h.  */
 375 struct __rtinit
 376 {
 377   /* Pointer to runtime linker.
 378      XXX: Is the parameter really void?  */
 379   int   (*rtl) (void);
 380
 381   /* Offset to array of init functions, 0 if none. */
 382   int   init_offset;
 383
 384   /* Offset to array of fini functions, 0 if none. */
 385   int   fini_offset;
 386
 387   /* Size of __RTINIT_DESCRIPTOR. This value should be used instead of
 388      sizeof(__RTINIT_DESCRIPTOR). */
 389   int   __rtinit_descriptor_size;
 390 };
 391
 392 #define RTINIT_DESCRIPTOR_SIZE (12)
 393
 394 struct __rtinit_descriptor
 395 {
 396   /* Init/fini function. */
 397   int   f;
 398
 399   /* Offset, relative to the start of the __rtinit symbol, to name of the
 400      function. */
 401
 402   int   name_offset;
 403
 404   /* Flags */
 405   unsigned char flags;
 406 };
 407
 408 /* Archive */
 409
 410 #define XCOFFARMAG    "<aiaff>\012"
 411 #define XCOFFARMAGBIG "<bigaf>\012"
 412 #define SXCOFFARMAG   8
 413
 414 /* The size of the ascii archive elements */
 415 #define XCOFFARMAG_ELEMENT_SIZE 12
 416 #define XCOFFARMAGBIG_ELEMENT_SIZE 20
 417
 418 /* This terminates an XCOFF archive member name.  */
 419
 420 #define XCOFFARFMAG "`\012"
 421 #define SXCOFFARFMAG 2
 422
 423 /* XCOFF archives start with this (printable) structure.  */
 424
 425 struct xcoff_ar_file_hdr
 426 {
 427   /* Magic string.  */
 428   char magic[SXCOFFARMAG];
 429
 430   /* Offset of the member table (decimal ASCII string).  */
 431   char memoff[XCOFFARMAG_ELEMENT_SIZE];
 432
 433   /* Offset of the global symbol table (decimal ASCII string).  */
 434   char symoff[XCOFFARMAG_ELEMENT_SIZE];
 435
 436   /* Offset of the first member in the archive (decimal ASCII string).  */
 437   char firstmemoff[XCOFFARMAG_ELEMENT_SIZE];
 438
 439   /* Offset of the last member in the archive (decimal ASCII string).  */
 440   char lastmemoff[XCOFFARMAG_ELEMENT_SIZE];
 441
 442   /* Offset of the first member on the free list (decimal ASCII
 443      string).  */
 444   char freeoff[XCOFFARMAG_ELEMENT_SIZE];
 445 };
 446
 447 #define SIZEOF_AR_FILE_HDR (SXCOFFARMAG + 5 * XCOFFARMAG_ELEMENT_SIZE)
 448
 449 /* This is the equivalent data structure for the big archive format.  */
 450
 451 struct xcoff_ar_file_hdr_big
 452 {
 453   /* Magic string.  */
 454   char magic[SXCOFFARMAG];
 455
 456   /* Offset of the member table (decimal ASCII string).  */
 457   char memoff[XCOFFARMAGBIG_ELEMENT_SIZE];
 458
 459   /* Offset of the global symbol table for 32-bit objects (decimal ASCII
 460      string).  */
 461   char symoff[XCOFFARMAGBIG_ELEMENT_SIZE];
 462
 463   /* Offset of the global symbol table for 64-bit objects (decimal ASCII
 464      string).  */
 465   char symoff64[XCOFFARMAGBIG_ELEMENT_SIZE];
 466
 467   /* Offset of the first member in the archive (decimal ASCII string).  */
 468   char firstmemoff[XCOFFARMAGBIG_ELEMENT_SIZE];
 469
 470   /* Offset of the last member in the archive (decimal ASCII string).  */
 471   char lastmemoff[XCOFFARMAGBIG_ELEMENT_SIZE];
 472
 473   /* Offset of the first member on the free list (decimal ASCII
 474      string).  */
 475   char freeoff[XCOFFARMAGBIG_ELEMENT_SIZE];
 476 };
 477
 478 #define SIZEOF_AR_FILE_HDR_BIG (SXCOFFARMAG + 6 * XCOFFARMAGBIG_ELEMENT_SIZE)
 479
 480 /* Each XCOFF archive member starts with this (printable) structure.  */
 481
 482 struct xcoff_ar_hdr
 483 {
 484   /* File size not including the header (decimal ASCII string).  */
 485   char size[XCOFFARMAG_ELEMENT_SIZE];
 486
 487   /* File offset of next archive member (decimal ASCII string).  */
 488   char nextoff[XCOFFARMAG_ELEMENT_SIZE];
 489
 490   /* File offset of previous archive member (decimal ASCII string).  */
 491   char prevoff[XCOFFARMAG_ELEMENT_SIZE];
 492
 493   /* File mtime (decimal ASCII string).  */
 494   char date[12];
 495
 496   /* File UID (decimal ASCII string).  */
 497   char uid[12];
 498
 499   /* File GID (decimal ASCII string).  */
 500   char gid[12];
 501
 502   /* File mode (octal ASCII string).  */
 503   char mode[12];
 504
 505   /* Length of file name (decimal ASCII string).  */
 506   char namlen[4];
 507
 508   /* This structure is followed by the file name.  The length of the
 509      name is given in the namlen field.  If the length of the name is
 510      odd, the name is followed by a null byte.  The name and optional
 511      null byte are followed by XCOFFARFMAG, which is not included in
 512      namlen.  The contents of the archive member follow; the number of
 513      bytes is given in the size field.  */
 514 };
 515
 516 #define SIZEOF_AR_HDR (3 * XCOFFARMAG_ELEMENT_SIZE + 4 * 12 + 4)
 517
 518 /* The equivalent for the big archive format.  */
 519
 520 struct xcoff_ar_hdr_big
 521 {
 522   /* File size not including the header (decimal ASCII string).  */
 523   char size[XCOFFARMAGBIG_ELEMENT_SIZE];
 524
 525   /* File offset of next archive member (decimal ASCII string).  */
 526   char nextoff[XCOFFARMAGBIG_ELEMENT_SIZE];
 527
 528   /* File offset of previous archive member (decimal ASCII string).  */
 529   char prevoff[XCOFFARMAGBIG_ELEMENT_SIZE];
 530
 531   /* File mtime (decimal ASCII string).  */
 532   char date[12];
 533
 534   /* File UID (decimal ASCII string).  */
 535   char uid[12];
 536
 537   /* File GID (decimal ASCII string).  */
 538   char gid[12];
 539
 540   /* File mode (octal ASCII string).  */
 541   char mode[12];
 542
 543   /* Length of file name (decimal ASCII string).  */
 544   char namlen[4];
 545
 546   /* This structure is followed by the file name.  The length of the
 547      name is given in the namlen field.  If the length of the name is
 548      odd, the name is followed by a null byte.  The name and optional
 549      null byte are followed by XCOFFARFMAG, which is not included in
 550      namlen.  The contents of the archive member follow; the number of
 551      bytes is given in the size field.  */
 552 };
 553
 554 #define SIZEOF_AR_HDR_BIG (3 * XCOFFARMAGBIG_ELEMENT_SIZE + 4 * 12 + 4)
 555
 556 /* We often have to distinguish between the old and big file format.
 557    Make it a bit cleaner.  We can use `xcoff_ardata' here because the
 558    `hdr' member has the same size and position in both formats.
 559    <bigaf> is the default format, return TRUE even when xcoff_ardata is
 560    NULL. */
 561 #ifndef SMALL_ARCHIVE
 562 /* Creates big archives by default */
 563 #define xcoff_big_format_p(abfd) \
 564   ((NULL != bfd_ardata (abfd) && NULL == xcoff_ardata (abfd)) || \
 565    ((NULL != bfd_ardata (abfd)) && \
 566     (NULL != xcoff_ardata (abfd)) && \
 567     (xcoff_ardata (abfd)->magic[1] == 'b')))
 568 #else
 569 /* Creates small archives by default. */
 570 #define xcoff_big_format_p(abfd) \
 571   (((NULL != bfd_ardata (abfd)) && \
 572     (NULL != xcoff_ardata (abfd)) && \
 573     (xcoff_ardata (abfd)->magic[1] == 'b')))
 574 #endif
 575
 576 /* We store a copy of the xcoff_ar_file_hdr in the tdata field of the
 577    artdata structure.  Similar for the big archive.  */
 578 #define xcoff_ardata(abfd) \
 579   ((struct xcoff_ar_file_hdr *) bfd_ardata (abfd)->tdata)
 580 #define xcoff_ardata_big(abfd) \
 581   ((struct xcoff_ar_file_hdr_big *) bfd_ardata (abfd)->tdata)
 582
 583 /* We store a copy of the xcoff_ar_hdr in the arelt_data field of an
 584    archive element.  Similar for the big archive.  */
 585 #define arch_eltdata(bfd) ((struct areltdata *) ((bfd)->arelt_data))
 586 #define arch_xhdr(bfd) \
 587   ((struct xcoff_ar_hdr *) arch_eltdata (bfd)->arch_header)
 588 #define arch_xhdr_big(bfd) \
 589   ((struct xcoff_ar_hdr_big *) arch_eltdata (bfd)->arch_header)
 590
 591 /* True if symbols of class CLASS are external.  */
 592 #define EXTERN_SYM_P(CLASS) \
 593   ((CLASS) == C_EXT || (CLASS) == C_AIX_WEAKEXT)
 594
 595 #endif /* _INTERNAL_XCOFF_H */