include/elf/mips.h

   1 /* MIPS ELF support for BFD.
   2    Copyright (C) 1993, 1994, 1995, 1996 Free Software Foundation, Inc.
   3
   4    By Ian Lance Taylor, Cygnus Support, <ian@cygnus.com>, from
   5    information in the System V Application Binary Interface, MIPS
   6    Processor Supplement.
   7
   8 This file is part of BFD, the Binary File Descriptor library.
   9
  10 This program is free software; you can redistribute it and/or modify
  11 it under the terms of the GNU General Public License as published by
  12 the Free Software Foundation; either version 2 of the License, or
  13 (at your option) any later version.
  14
  15 This program is distributed in the hope that it will be useful,
  16 but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 GNU General Public License for more details.
  19
  20 You should have received a copy of the GNU General Public License
  21 along with this program; if not, write to the Free Software
  22 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  23
  24 /* This file holds definitions specific to the MIPS ELF ABI.  Note
  25    that most of this is not actually implemented by BFD.  */
  26
  27 #ifndef _ELF_MIPS_H
  28 #define _ELF_MIPS_H
  29
  30 /* Processor specific flags for the ELF header e_flags field.  */
  31
  32 /* At least one .noreorder directive appears in the source.  */
  33 #define EF_MIPS_NOREORDER       0x00000001
  34
  35 /* File contains position independent code.  */
  36 #define EF_MIPS_PIC             0x00000002
  37
  38 /* Code in file uses the standard calling sequence for calling
  39    position independent code.  */
  40 #define EF_MIPS_CPIC            0x00000004
  41
  42 /* Code in file uses new ABI (-n32 on Irix 6).  */
  43 #define EF_MIPS_ABI2            0x00000020
  44
  45 /* Four bit MIPS architecture field.  */
  46 #define EF_MIPS_ARCH            0xf0000000
  47
  48 /* -mips1 code.  */
  49 #define E_MIPS_ARCH_1           0x00000000
  50
  51 /* -mips2 code.  */
  52 #define E_MIPS_ARCH_2           0x10000000
  53
  54 /* -mips3 code.  */
  55 #define E_MIPS_ARCH_3           0x20000000
  56
  57 /* -mips4 code.  */
  58 #define E_MIPS_ARCH_4           0x30000000
  59
  60 /* Machine variant if we know it.  This field was invented at Cygnus,
  61    but it is hoped that other vendors will adopt it.  If some standard
  62    is developed, this code should be changed to follow it. */
  63
  64 #define EF_MIPS_MACH            0x00FF0000
  65
  66 /* Cygnus is choosing values between 80 and 9F;
  67    00 - 7F should be left for a future standard;
  68    the rest are open. */
  69
  70 #define E_MIPS_MACH_3900        0x00810000
  71
  72 #define E_MIPS_MACH_4010        0x00820000
  73 #define E_MIPS_MACH_4100        0x00830000
  74 /* start-sanitize-vr4320 */
  75 #define E_MIPS_MACH_4320        0x00840000
  76 /* end-sanitize-vr4320 */
  77 #define E_MIPS_MACH_4650        0x00850000
  78 /* start-sanitize-tx49 */
  79 #define E_MIPS_MACH_4900        0x00860000
  80 /* end-sanitize-tx49 */
  81
  82 /* start-sanitize-vr5400 */
  83 #define E_MIPS_MACH_5400        0x00910000
  84 /* end-sanitize-vr5400 */
  85 /* start-sanitize-r5900 */
  86 #define E_MIPS_MACH_5900        0x00920000
  87 /* end-sanitize-r5900 */
  88 \f
  89 /* Processor specific section indices.  These sections do not actually
  90    exist.  Symbols with a st_shndx field corresponding to one of these
  91    values have a special meaning.  */
  92
  93 /* Defined and allocated common symbol.  Value is virtual address.  If
  94    relocated, alignment must be preserved.  */
  95 #define SHN_MIPS_ACOMMON        0xff00
  96
  97 /* Defined and allocated text symbol.  Value is virtual address.
  98    Occur in the dynamic symbol table of Alpha OSF/1 and Irix 5 executables.  */
  99 #define SHN_MIPS_TEXT           0xff01
 100
 101 /* Defined and allocated data symbol.  Value is virtual address.
 102    Occur in the dynamic symbol table of Alpha OSF/1 and Irix 5 executables.  */
 103 #define SHN_MIPS_DATA           0xff02
 104
 105 /* Small common symbol.  */
 106 #define SHN_MIPS_SCOMMON        0xff03
 107
 108 /* Small undefined symbol.  */
 109 #define SHN_MIPS_SUNDEFINED     0xff04
 110 \f
 111 /* Processor specific section types.  */
 112
 113 /* Section contains the set of dynamic shared objects used when
 114    statically linking.  */
 115 #define SHT_MIPS_LIBLIST        0x70000000
 116
 117 /* I'm not sure what this is, but it's used on Irix 5.  */
 118 #define SHT_MIPS_MSYM           0x70000001
 119
 120 /* Section contains list of symbols whose definitions conflict with
 121    symbols defined in shared objects.  */
 122 #define SHT_MIPS_CONFLICT       0x70000002
 123
 124 /* Section contains the global pointer table.  */
 125 #define SHT_MIPS_GPTAB          0x70000003
 126
 127 /* Section contains microcode information.  The exact format is
 128    unspecified.  */
 129 #define SHT_MIPS_UCODE          0x70000004
 130
 131 /* Section contains some sort of debugging information.  The exact
 132    format is unspecified.  It's probably ECOFF symbols.  */
 133 #define SHT_MIPS_DEBUG          0x70000005
 134
 135 /* Section contains register usage information.  */
 136 #define SHT_MIPS_REGINFO        0x70000006
 137
 138 /* Section contains interface information.  */
 139 #define SHT_MIPS_IFACE          0x7000000b
 140
 141 /* Section contains description of contents of another section.  */
 142 #define SHT_MIPS_CONTENT        0x7000000c
 143
 144 /* Section contains miscellaneous options.  */
 145 #define SHT_MIPS_OPTIONS        0x7000000d
 146
 147 /* DWARF debugging section.  */
 148 #define SHT_MIPS_DWARF          0x7000001e
 149
 150 /* I'm not sure what this is, but it appears on Irix 6.  */
 151 #define SHT_MIPS_SYMBOL_LIB     0x70000020
 152
 153 /* Events section.  */
 154 #define SHT_MIPS_EVENTS         0x70000021
 155
 156 /* start-sanitize-sky */
 157 /* The VU overlay table.  */
 158 #define SHT_DVP_OVERLAY_TABLE           0x7ffff420
 159 #define SHNAME_DVP_OVERLAY_TABLE        ".DVP.ovlytab"
 160 #define SHNAME_DVP_OVERLAY_STRTAB       ".DVP.ovlystrtab"
 161 /* A VU overlay.  */
 162 #define SHT_DVP_OVERLAY                 0x7ffff421
 163 /* Prefix of VU overlay sections.  */
 164 #define SHNAME_DVP_OVERLAY_PREFIX       ".DVP.overlay."
 165 /* end-sanitize-sky */
 166
 167 /* A section of type SHT_MIPS_LIBLIST contains an array of the
 168    following structure.  The sh_link field is the section index of the
 169    string table.  The sh_info field is the number of entries in the
 170    section.  */
 171 typedef struct
 172 {
 173   /* String table index for name of shared object.  */
 174   unsigned long l_name;
 175   /* Time stamp.  */
 176   unsigned long l_time_stamp;
 177   /* Checksum of symbol names and common sizes.  */
 178   unsigned long l_checksum;
 179   /* String table index for version.  */
 180   unsigned long l_version;
 181   /* Flags.  */
 182   unsigned long l_flags;
 183 } Elf32_Lib;
 184
 185 /* The l_flags field of an Elf32_Lib structure may contain the
 186    following flags.  */
 187
 188 /* Require an exact match at runtime.  */
 189 #define LL_EXACT_MATCH          0x00000001
 190
 191 /* Ignore version incompatibilities at runtime.  */
 192 #define LL_IGNORE_INT_VER       0x00000002
 193
 194 /* A section of type SHT_MIPS_CONFLICT is an array of indices into the
 195    .dynsym section.  Each element has the following type.  */
 196 typedef unsigned long Elf32_Conflict;
 197
 198 /* A section of type SHT_MIPS_GPTAB contains information about how
 199    much GP space would be required for different -G arguments.  This
 200    information is only used so that the linker can provide informative
 201    suggestions as to the best -G value to use.  The sh_info field is
 202    the index of the section for which this information applies.  The
 203    contents of the section are an array of the following union.  The
 204    first element uses the gt_header field.  The remaining elements use
 205    the gt_entry field.  */
 206 typedef union
 207 {
 208   struct
 209     {
 210       /* -G value actually used for this object file.  */
 211       unsigned long gt_current_g_value;
 212       /* Unused.  */
 213       unsigned long gt_unused;
 214     } gt_header;
 215   struct
 216     {
 217       /* If this -G argument has been used...  */
 218       unsigned long gt_g_value;
 219       /* ...this many GP section bytes would be required.  */
 220       unsigned long gt_bytes;
 221     } gt_entry;
 222 } Elf32_gptab;
 223
 224 /* The external version of Elf32_gptab.  */
 225
 226 typedef union
 227 {
 228   struct
 229     {
 230       unsigned char gt_current_g_value[4];
 231       unsigned char gt_unused[4];
 232     } gt_header;
 233   struct
 234     {
 235       unsigned char gt_g_value[4];
 236       unsigned char gt_bytes[4];
 237     } gt_entry;
 238 } Elf32_External_gptab;
 239
 240 /* A section of type SHT_MIPS_REGINFO contains the following
 241    structure.  */
 242 typedef struct
 243 {
 244   /* Mask of general purpose registers used.  */
 245   unsigned long ri_gprmask;
 246   /* Mask of co-processor registers used.  */
 247   unsigned long ri_cprmask[4];
 248   /* GP register value for this object file.  */
 249   long ri_gp_value;
 250 } Elf32_RegInfo;
 251
 252 /* The external version of the Elf_RegInfo structure.  */
 253 typedef struct
 254 {
 255   unsigned char ri_gprmask[4];
 256   unsigned char ri_cprmask[4][4];
 257   unsigned char ri_gp_value[4];
 258 } Elf32_External_RegInfo;
 259
 260 /* MIPS ELF .reginfo swapping routines.  */
 261 extern void bfd_mips_elf32_swap_reginfo_in
 262   PARAMS ((bfd *, const Elf32_External_RegInfo *, Elf32_RegInfo *));
 263 extern void bfd_mips_elf32_swap_reginfo_out
 264   PARAMS ((bfd *, const Elf32_RegInfo *, Elf32_External_RegInfo *));
 265 \f
 266 /* Processor specific section flags.  */
 267
 268 /* This section must be in the global data area.  */
 269 #define SHF_MIPS_GPREL          0x10000000
 270
 271 /* This section should be merged.  */
 272 #define SHF_MIPS_MERGE          0x20000000
 273
 274 /* This section contains 32 bit addresses.  */
 275 #define SHF_MIPS_ADDR32         0x40000000
 276
 277 /* This section contains 64 bit addresses.  */
 278 #define SHF_MIPS_ADDR64         0x80000000
 279
 280 /* This section may not be stripped.  */
 281 #define SHF_MIPS_NOSTRIP        0x08000000
 282
 283 /* This section is local to threads.  */
 284 #define SHF_MIPS_LOCAL          0x04000000
 285
 286 /* Linker should generate implicit weak names for this section.  */
 287 #define SHF_MIPS_NAMES          0x02000000
 288 \f
 289 /* Processor specific program header types.  */
 290
 291 /* Register usage information.  Identifies one .reginfo section.  */
 292 #define PT_MIPS_REGINFO         0x70000000
 293
 294 /* Runtime procedure table.  */
 295 #define PT_MIPS_RTPROC          0x70000001
 296 \f
 297 /* Processor specific dynamic array tags.  */
 298
 299 /* 32 bit version number for runtime linker interface.  */
 300 #define DT_MIPS_RLD_VERSION     0x70000001
 301
 302 /* Time stamp.  */
 303 #define DT_MIPS_TIME_STAMP      0x70000002
 304
 305 /* Checksum of external strings and common sizes.  */
 306 #define DT_MIPS_ICHECKSUM       0x70000003
 307
 308 /* Index of version string in string table.  */
 309 #define DT_MIPS_IVERSION        0x70000004
 310
 311 /* 32 bits of flags.  */
 312 #define DT_MIPS_FLAGS           0x70000005
 313
 314 /* Base address of the segment.  */
 315 #define DT_MIPS_BASE_ADDRESS    0x70000006
 316
 317 /* Address of .conflict section.  */
 318 #define DT_MIPS_CONFLICT        0x70000008
 319
 320 /* Address of .liblist section.  */
 321 #define DT_MIPS_LIBLIST         0x70000009
 322
 323 /* Number of local global offset table entries.  */
 324 #define DT_MIPS_LOCAL_GOTNO     0x7000000a
 325
 326 /* Number of entries in the .conflict section.  */
 327 #define DT_MIPS_CONFLICTNO      0x7000000b
 328
 329 /* Number of entries in the .liblist section.  */
 330 #define DT_MIPS_LIBLISTNO       0x70000010
 331
 332 /* Number of entries in the .dynsym section.  */
 333 #define DT_MIPS_SYMTABNO        0x70000011
 334
 335 /* Index of first external dynamic symbol not referenced locally.  */
 336 #define DT_MIPS_UNREFEXTNO      0x70000012
 337
 338 /* Index of first dynamic symbol in global offset table.  */
 339 #define DT_MIPS_GOTSYM          0x70000013
 340
 341 /* Number of page table entries in global offset table.  */
 342 #define DT_MIPS_HIPAGENO        0x70000014
 343
 344 /* Address of run time loader map, used for debugging.  */
 345 #define DT_MIPS_RLD_MAP         0x70000016
 346 \f
 347 /* Flags which may appear in a DT_MIPS_FLAGS entry.  */
 348
 349 /* No flags.  */
 350 #define RHF_NONE                0x00000000
 351
 352 /* Uses shortcut pointers.  */
 353 #define RHF_QUICKSTART          0x00000001
 354
 355 /* Hash size is not a power of two.  */
 356 #define RHF_NOTPOT              0x00000002
 357
 358 /* Ignore LD_LIBRARY_PATH.  */
 359 #define RHS_NO_LIBRARY_REPLACEMENT \
 360                                 0x00000004
 361 \f
 362 /* Special values for the st_other field in the symbol table.  These
 363    are used in an Irix 5 dynamic symbol table.  */
 364
 365 #define STO_DEFAULT             0x00
 366 #define STO_INTERNAL            0x01
 367 #define STO_HIDDEN              0x02
 368 #define STO_PROTECTED           0x03
 369
 370 /* start-sanitize-sky */
 371 /* These values are used for the dvp.  */
 372 #define STO_DVP_DMA             0xe8
 373 #define STO_DVP_VIF             0xe9
 374 #define STO_DVP_GIF             0xea
 375 #define STO_DVP_VU              0xeb
 376 /* Reserve a couple in case we need them.  */
 377 #define STO_DVP_RES1            0xec
 378 #define STO_DVP_RES2            0xed
 379 #define STO_DVP_P(sto) ((sto) >= STO_DVP_DMA && (sto) <= STO_DVP_RES2)
 380
 381 /* end-sanitize-sky */
 382 /* This value is used for a mips16 .text symbol.  */
 383 #define STO_MIPS16              0xf0
 384 \f
 385 /* The 64-bit MIPS ELF ABI uses an unusual reloc format.  Each
 386    relocation entry specifies up to three actual relocations, all at
 387    the same address.  The first relocation which required a symbol
 388    uses the symbol in the r_sym field.  The second relocation which
 389    requires a symbol uses the symbol in the r_ssym field.  If all
 390    three relocations require a symbol, the third one uses a zero
 391    value.  */
 392
 393 /* An entry in a 64 bit SHT_REL section.  */
 394
 395 typedef struct
 396 {
 397   /* Address of relocation.  */
 398   unsigned char r_offset[8];
 399   /* Symbol index.  */
 400   unsigned char r_sym[4];
 401   /* Special symbol.  */
 402   unsigned char r_ssym[1];
 403   /* Third relocation.  */
 404   unsigned char r_type3[1];
 405   /* Second relocation.  */
 406   unsigned char r_type2[1];
 407   /* First relocation.  */
 408   unsigned char r_type[1];
 409 } Elf64_Mips_External_Rel;
 410
 411 typedef struct
 412 {
 413   /* Address of relocation.  */
 414   bfd_vma r_offset;
 415   /* Symbol index.  */
 416   unsigned long r_sym;
 417   /* Special symbol.  */
 418   unsigned char r_ssym;
 419   /* Third relocation.  */
 420   unsigned char r_type3;
 421   /* Second relocation.  */
 422   unsigned char r_type2;
 423   /* First relocation.  */
 424   unsigned char r_type;
 425 } Elf64_Mips_Internal_Rel;
 426
 427 /* An entry in a 64 bit SHT_RELA section.  */
 428
 429 typedef struct
 430 {
 431   /* Address of relocation.  */
 432   unsigned char r_offset[8];
 433   /* Symbol index.  */
 434   unsigned char r_sym[4];
 435   /* Special symbol.  */
 436   unsigned char r_ssym[1];
 437   /* Third relocation.  */
 438   unsigned char r_type3[1];
 439   /* Second relocation.  */
 440   unsigned char r_type2[1];
 441   /* First relocation.  */
 442   unsigned char r_type[1];
 443   /* Addend.  */
 444   unsigned char r_addend[8];
 445 } Elf64_Mips_External_Rela;
 446
 447 typedef struct
 448 {
 449   /* Address of relocation.  */
 450   bfd_vma r_offset;
 451   /* Symbol index.  */
 452   unsigned long r_sym;
 453   /* Special symbol.  */
 454   unsigned char r_ssym;
 455   /* Third relocation.  */
 456   unsigned char r_type3;
 457   /* Second relocation.  */
 458   unsigned char r_type2;
 459   /* First relocation.  */
 460   unsigned char r_type;
 461   /* Addend.  */
 462   bfd_signed_vma r_addend;
 463 } Elf64_Mips_Internal_Rela;
 464
 465 /* Values found in the r_ssym field of a relocation entry.  */
 466
 467 /* No relocation.  */
 468 #define RSS_UNDEF       0
 469
 470 /* Value of GP.  */
 471 #define RSS_GP          1
 472
 473 /* Value of GP in object being relocated.  */
 474 #define RSS_GP0         2
 475
 476 /* Address of location being relocated.  */
 477 #define RSS_LOC         3
 478 \f
 479 /* A SHT_MIPS_OPTIONS section contains a series of options, each of
 480    which starts with this header.  */
 481
 482 typedef struct
 483 {
 484   /* Type of option.  */
 485   unsigned char kind[1];
 486   /* Size of option descriptor, including header.  */
 487   unsigned char size[1];
 488   /* Section index of affected section, or 0 for global option.  */
 489   unsigned char section[2];
 490   /* Information specific to this kind of option.  */
 491   unsigned char info[4];
 492 } Elf_External_Options;
 493
 494 typedef struct
 495 {
 496   /* Type of option.  */
 497   unsigned char kind;
 498   /* Size of option descriptor, including header.  */
 499   unsigned char size;
 500   /* Section index of affected section, or 0 for global option.  */
 501   unsigned short section;
 502   /* Information specific to this kind of option.  */
 503   unsigned long info;
 504 } Elf_Internal_Options;
 505
 506 /* MIPS ELF option header swapping routines.  */
 507 extern void bfd_mips_elf_swap_options_in
 508   PARAMS ((bfd *, const Elf_External_Options *, Elf_Internal_Options *));
 509 extern void bfd_mips_elf_swap_options_out
 510   PARAMS ((bfd *, const Elf_Internal_Options *, Elf_External_Options *));
 511
 512 /* Values which may appear in the kind field of an Elf_Options
 513    structure.  */
 514
 515 /* Undefined.  */
 516 #define ODK_NULL        0
 517
 518 /* Register usage and GP value.  */
 519 #define ODK_REGINFO     1
 520
 521 /* Exception processing information.  */
 522 #define ODK_EXCEPTIONS  2
 523
 524 /* Section padding information.  */
 525 #define ODK_PAD         3
 526
 527 /* In the 32 bit ABI, an ODK_REGINFO option is just a Elf32_Reginfo
 528    structure.  In the 64 bit ABI, it is the following structure.  The
 529    info field of the options header is not used.  */
 530
 531 typedef struct
 532 {
 533   /* Mask of general purpose registers used.  */
 534   unsigned char ri_gprmask[4];
 535   /* Padding.  */
 536   unsigned char ri_pad[4];
 537   /* Mask of co-processor registers used.  */
 538   unsigned char ri_cprmask[4][4];
 539   /* GP register value for this object file.  */
 540   unsigned char ri_gp_value[8];
 541 } Elf64_External_RegInfo;
 542
 543 typedef struct
 544 {
 545   /* Mask of general purpose registers used.  */
 546   unsigned long ri_gprmask;
 547   /* Padding.  */
 548   unsigned long ri_pad;
 549   /* Mask of co-processor registers used.  */
 550   unsigned long ri_cprmask[4];
 551   /* GP register value for this object file.  */
 552   bfd_vma ri_gp_value;
 553 } Elf64_Internal_RegInfo;
 554
 555 /* MIPS ELF reginfo swapping routines.  */
 556 extern void bfd_mips_elf64_swap_reginfo_in
 557   PARAMS ((bfd *, const Elf64_External_RegInfo *, Elf64_Internal_RegInfo *));
 558 extern void bfd_mips_elf64_swap_reginfo_out
 559   PARAMS ((bfd *, const Elf64_Internal_RegInfo *, Elf64_External_RegInfo *));
 560 \f
 561 /* start-sanitize-sky */
 562 /* The vu overlay table is an array of this.  */
 563
 564 typedef struct
 565 {
 566   /* Offset into overlay string table section.  */
 567   char name[8];
 568   char lma[8];
 569   char vma[8];
 570 } Elf64_Dvp_External_Overlay;
 571
 572 typedef struct
 573 {
 574   bfd_vma name;
 575   bfd_vma lma;
 576   bfd_vma vma;
 577 } Elf64_Dvp_Internal_Overlay;
 578
 579 /* overlay swapping routines.  */
 580 extern void bfd_dvp_elf64_swap_overlay_in
 581   PARAMS ((bfd *, const Elf64_Dvp_External_Overlay *,
 582            Elf64_Dvp_Internal_Overlay *));
 583 extern void bfd_dvp_elf64_swap_overlay_out
 584   PARAMS ((bfd *, const Elf64_Dvp_Internal_Overlay *,
 585            Elf64_Dvp_External_Overlay *));
 586
 587 /* end-sanitize-sky */
 588
 589 #endif /* _ELF_MIPS_H */