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 \f
  60 /* Processor specific section indices.  These sections do not actually
  61    exist.  Symbols with a st_shndx field corresponding to one of these
  62    values have a special meaning.  */
  63
  64 /* Defined and allocated common symbol.  Value is virtual address.  If
  65    relocated, alignment must be preserved.  */
  66 #define SHN_MIPS_ACOMMON        0xff00
  67
  68 /* Defined and allocated text symbol.  Value is virtual address.
  69    Occur in the dynamic symbol table of Alpha OSF/1 and Irix 5 executables.  */
  70 #define SHN_MIPS_TEXT           0xff01
  71
  72 /* Defined and allocated data symbol.  Value is virtual address.
  73    Occur in the dynamic symbol table of Alpha OSF/1 and Irix 5 executables.  */
  74 #define SHN_MIPS_DATA           0xff02
  75
  76 /* Small common symbol.  */
  77 #define SHN_MIPS_SCOMMON        0xff03
  78
  79 /* Small undefined symbol.  */
  80 #define SHN_MIPS_SUNDEFINED     0xff04
  81 \f
  82 /* Processor specific section types.  */
  83
  84 /* Section contains the set of dynamic shared objects used when
  85    statically linking.  */
  86 #define SHT_MIPS_LIBLIST        0x70000000
  87
  88 /* I'm not sure what this is, but it's used on Irix 5.  */
  89 #define SHT_MIPS_MSYM           0x70000001
  90
  91 /* Section contains list of symbols whose definitions conflict with
  92    symbols defined in shared objects.  */
  93 #define SHT_MIPS_CONFLICT       0x70000002
  94
  95 /* Section contains the global pointer table.  */
  96 #define SHT_MIPS_GPTAB          0x70000003
  97
  98 /* Section contains microcode information.  The exact format is
  99    unspecified.  */
 100 #define SHT_MIPS_UCODE          0x70000004
 101
 102 /* Section contains some sort of debugging information.  The exact
 103    format is unspecified.  It's probably ECOFF symbols.  */
 104 #define SHT_MIPS_DEBUG          0x70000005
 105
 106 /* Section contains register usage information.  */
 107 #define SHT_MIPS_REGINFO        0x70000006
 108
 109 /* Section contains interface information.  */
 110 #define SHT_MIPS_IFACE          0x7000000b
 111
 112 /* Section contains description of contents of another section.  */
 113 #define SHT_MIPS_CONTENT        0x7000000c
 114
 115 /* Section contains miscellaneous options.  */
 116 #define SHT_MIPS_OPTIONS        0x7000000d
 117
 118 /* DWARF debugging section.  */
 119 #define SHT_MIPS_DWARF          0x7000001e
 120
 121 /* I'm not sure what this is, but it appears on Irix 6.  */
 122 #define SHT_MIPS_SYMBOL_LIB     0x70000020
 123
 124 /* Events section.  */
 125 #define SHT_MIPS_EVENTS         0x70000021
 126
 127 /* A section of type SHT_MIPS_LIBLIST contains an array of the
 128    following structure.  The sh_link field is the section index of the
 129    string table.  The sh_info field is the number of entries in the
 130    section.  */
 131 typedef struct
 132 {
 133   /* String table index for name of shared object.  */
 134   unsigned long l_name;
 135   /* Time stamp.  */
 136   unsigned long l_time_stamp;
 137   /* Checksum of symbol names and common sizes.  */
 138   unsigned long l_checksum;
 139   /* String table index for version.  */
 140   unsigned long l_version;
 141   /* Flags.  */
 142   unsigned long l_flags;
 143 } Elf32_Lib;
 144
 145 /* The l_flags field of an Elf32_Lib structure may contain the
 146    following flags.  */
 147
 148 /* Require an exact match at runtime.  */
 149 #define LL_EXACT_MATCH          0x00000001
 150
 151 /* Ignore version incompatibilities at runtime.  */
 152 #define LL_IGNORE_INT_VER       0x00000002
 153
 154 /* A section of type SHT_MIPS_CONFLICT is an array of indices into the
 155    .dynsym section.  Each element has the following type.  */
 156 typedef unsigned long Elf32_Conflict;
 157
 158 /* A section of type SHT_MIPS_GPTAB contains information about how
 159    much GP space would be required for different -G arguments.  This
 160    information is only used so that the linker can provide informative
 161    suggestions as to the best -G value to use.  The sh_info field is
 162    the index of the section for which this information applies.  The
 163    contents of the section are an array of the following union.  The
 164    first element uses the gt_header field.  The remaining elements use
 165    the gt_entry field.  */
 166 typedef union
 167 {
 168   struct
 169     {
 170       /* -G value actually used for this object file.  */
 171       unsigned long gt_current_g_value;
 172       /* Unused.  */
 173       unsigned long gt_unused;
 174     } gt_header;
 175   struct
 176     {
 177       /* If this -G argument has been used...  */
 178       unsigned long gt_g_value;
 179       /* ...this many GP section bytes would be required.  */
 180       unsigned long gt_bytes;
 181     } gt_entry;
 182 } Elf32_gptab;
 183
 184 /* The external version of Elf32_gptab.  */
 185
 186 typedef union
 187 {
 188   struct
 189     {
 190       unsigned char gt_current_g_value[4];
 191       unsigned char gt_unused[4];
 192     } gt_header;
 193   struct
 194     {
 195       unsigned char gt_g_value[4];
 196       unsigned char gt_bytes[4];
 197     } gt_entry;
 198 } Elf32_External_gptab;
 199
 200 /* A section of type SHT_MIPS_REGINFO contains the following
 201    structure.  */
 202 typedef struct
 203 {
 204   /* Mask of general purpose registers used.  */
 205   unsigned long ri_gprmask;
 206   /* Mask of co-processor registers used.  */
 207   unsigned long ri_cprmask[4];
 208   /* GP register value for this object file.  */
 209   long ri_gp_value;
 210 } Elf32_RegInfo;
 211
 212 /* The external version of the Elf_RegInfo structure.  */
 213 typedef struct
 214 {
 215   unsigned char ri_gprmask[4];
 216   unsigned char ri_cprmask[4][4];
 217   unsigned char ri_gp_value[4];
 218 } Elf32_External_RegInfo;
 219
 220 /* MIPS ELF .reginfo swapping routines.  */
 221 extern void bfd_mips_elf32_swap_reginfo_in
 222   PARAMS ((bfd *, const Elf32_External_RegInfo *, Elf32_RegInfo *));
 223 extern void bfd_mips_elf32_swap_reginfo_out
 224   PARAMS ((bfd *, const Elf32_RegInfo *, Elf32_External_RegInfo *));
 225 \f
 226 /* Processor specific section flags.  */
 227
 228 /* This section must be in the global data area.  */
 229 #define SHF_MIPS_GPREL          0x10000000
 230
 231 /* This section should be merged.  */
 232 #define SHF_MIPS_MERGE          0x20000000
 233
 234 /* This section contains 32 bit addresses.  */
 235 #define SHF_MIPS_ADDR32         0x40000000
 236
 237 /* This section contains 64 bit addresses.  */
 238 #define SHF_MIPS_ADDR64         0x80000000
 239
 240 /* This section may not be stripped.  */
 241 #define SHF_MIPS_NOSTRIP        0x08000000
 242
 243 /* This section is local to threads.  */
 244 #define SHF_MIPS_LOCAL          0x04000000
 245
 246 /* Linker should generate implicit weak names for this section.  */
 247 #define SHF_MIPS_NAMES          0x02000000
 248 \f
 249 /* Processor specific program header types.  */
 250
 251 /* Register usage information.  Identifies one .reginfo section.  */
 252 #define PT_MIPS_REGINFO         0x70000000
 253
 254 /* Runtime procedure table.  */
 255 #define PT_MIPS_RTPROC          0x70000001
 256 \f
 257 /* Processor specific dynamic array tags.  */
 258
 259 /* 32 bit version number for runtime linker interface.  */
 260 #define DT_MIPS_RLD_VERSION     0x70000001
 261
 262 /* Time stamp.  */
 263 #define DT_MIPS_TIME_STAMP      0x70000002
 264
 265 /* Checksum of external strings and common sizes.  */
 266 #define DT_MIPS_ICHECKSUM       0x70000003
 267
 268 /* Index of version string in string table.  */
 269 #define DT_MIPS_IVERSION        0x70000004
 270
 271 /* 32 bits of flags.  */
 272 #define DT_MIPS_FLAGS           0x70000005
 273
 274 /* Base address of the segment.  */
 275 #define DT_MIPS_BASE_ADDRESS    0x70000006
 276
 277 /* Address of .conflict section.  */
 278 #define DT_MIPS_CONFLICT        0x70000008
 279
 280 /* Address of .liblist section.  */
 281 #define DT_MIPS_LIBLIST         0x70000009
 282
 283 /* Number of local global offset table entries.  */
 284 #define DT_MIPS_LOCAL_GOTNO     0x7000000a
 285
 286 /* Number of entries in the .conflict section.  */
 287 #define DT_MIPS_CONFLICTNO      0x7000000b
 288
 289 /* Number of entries in the .liblist section.  */
 290 #define DT_MIPS_LIBLISTNO       0x70000010
 291
 292 /* Number of entries in the .dynsym section.  */
 293 #define DT_MIPS_SYMTABNO        0x70000011
 294
 295 /* Index of first external dynamic symbol not referenced locally.  */
 296 #define DT_MIPS_UNREFEXTNO      0x70000012
 297
 298 /* Index of first dynamic symbol in global offset table.  */
 299 #define DT_MIPS_GOTSYM          0x70000013
 300
 301 /* Number of page table entries in global offset table.  */
 302 #define DT_MIPS_HIPAGENO        0x70000014
 303
 304 /* Address of run time loader map, used for debugging.  */
 305 #define DT_MIPS_RLD_MAP         0x70000016
 306 \f
 307 /* Flags which may appear in a DT_MIPS_FLAGS entry.  */
 308
 309 /* No flags.  */
 310 #define RHF_NONE                0x00000000
 311
 312 /* Uses shortcut pointers.  */
 313 #define RHF_QUICKSTART          0x00000001
 314
 315 /* Hash size is not a power of two.  */
 316 #define RHF_NOTPOT              0x00000002
 317
 318 /* Ignore LD_LIBRARY_PATH.  */
 319 #define RHS_NO_LIBRARY_REPLACEMENT \
 320                                 0x00000004
 321 \f
 322 /* Special values for the st_other field in the symbol table.  These
 323    are used in an Irix 5 dynamic symbol table.  */
 324
 325 #define STO_DEFAULT             0x00
 326 #define STO_INTERNAL            0x01
 327 #define STO_HIDDEN              0x02
 328 #define STO_PROTECTED           0x03
 329
 330 /* start-sanitize-sky */
 331 /* These values are used for the dvp.  */
 332 #define STO_DVP_DMA             0xe8
 333 #define STO_DVP_PKE             0xe9
 334 #define STO_DVP_GPUIF           0xea
 335 #define STO_DVP_VU              0xeb
 336 #define MIPS_STO_DVP_P(sto) ((sto) >= STO_DVP_DMA && (sto) <= STO_DVP_VU)
 337
 338 /* end-sanitize-sky */
 339 /* This value is used for a mips16 .text symbol.  */
 340 #define STO_MIPS16              0xf0
 341 \f
 342 /* The 64-bit MIPS ELF ABI uses an unusual reloc format.  Each
 343    relocation entry specifies up to three actual relocations, all at
 344    the same address.  The first relocation which required a symbol
 345    uses the symbol in the r_sym field.  The second relocation which
 346    requires a symbol uses the symbol in the r_ssym field.  If all
 347    three relocations require a symbol, the third one uses a zero
 348    value.  */
 349
 350 /* An entry in a 64 bit SHT_REL section.  */
 351
 352 typedef struct
 353 {
 354   /* Address of relocation.  */
 355   unsigned char r_offset[8];
 356   /* Symbol index.  */
 357   unsigned char r_sym[4];
 358   /* Special symbol.  */
 359   unsigned char r_ssym[1];
 360   /* Third relocation.  */
 361   unsigned char r_type3[1];
 362   /* Second relocation.  */
 363   unsigned char r_type2[1];
 364   /* First relocation.  */
 365   unsigned char r_type[1];
 366 } Elf64_Mips_External_Rel;
 367
 368 typedef struct
 369 {
 370   /* Address of relocation.  */
 371   bfd_vma r_offset;
 372   /* Symbol index.  */
 373   unsigned long r_sym;
 374   /* Special symbol.  */
 375   unsigned char r_ssym;
 376   /* Third relocation.  */
 377   unsigned char r_type3;
 378   /* Second relocation.  */
 379   unsigned char r_type2;
 380   /* First relocation.  */
 381   unsigned char r_type;
 382 } Elf64_Mips_Internal_Rel;
 383
 384 /* An entry in a 64 bit SHT_RELA section.  */
 385
 386 typedef struct
 387 {
 388   /* Address of relocation.  */
 389   unsigned char r_offset[8];
 390   /* Symbol index.  */
 391   unsigned char r_sym[4];
 392   /* Special symbol.  */
 393   unsigned char r_ssym[1];
 394   /* Third relocation.  */
 395   unsigned char r_type3[1];
 396   /* Second relocation.  */
 397   unsigned char r_type2[1];
 398   /* First relocation.  */
 399   unsigned char r_type[1];
 400   /* Addend.  */
 401   unsigned char r_addend[8];
 402 } Elf64_Mips_External_Rela;
 403
 404 typedef struct
 405 {
 406   /* Address of relocation.  */
 407   bfd_vma r_offset;
 408   /* Symbol index.  */
 409   unsigned long r_sym;
 410   /* Special symbol.  */
 411   unsigned char r_ssym;
 412   /* Third relocation.  */
 413   unsigned char r_type3;
 414   /* Second relocation.  */
 415   unsigned char r_type2;
 416   /* First relocation.  */
 417   unsigned char r_type;
 418   /* Addend.  */
 419   bfd_signed_vma r_addend;
 420 } Elf64_Mips_Internal_Rela;
 421
 422 /* Values found in the r_ssym field of a relocation entry.  */
 423
 424 /* No relocation.  */
 425 #define RSS_UNDEF       0
 426
 427 /* Value of GP.  */
 428 #define RSS_GP          1
 429
 430 /* Value of GP in object being relocated.  */
 431 #define RSS_GP0         2
 432
 433 /* Address of location being relocated.  */
 434 #define RSS_LOC         3
 435 \f
 436 /* A SHT_MIPS_OPTIONS section contains a series of options, each of
 437    which starts with this header.  */
 438
 439 typedef struct
 440 {
 441   /* Type of option.  */
 442   unsigned char kind[1];
 443   /* Size of option descriptor, including header.  */
 444   unsigned char size[1];
 445   /* Section index of affected section, or 0 for global option.  */
 446   unsigned char section[2];
 447   /* Information specific to this kind of option.  */
 448   unsigned char info[4];
 449 } Elf_External_Options;
 450
 451 typedef struct
 452 {
 453   /* Type of option.  */
 454   unsigned char kind;
 455   /* Size of option descriptor, including header.  */
 456   unsigned char size;
 457   /* Section index of affected section, or 0 for global option.  */
 458   unsigned short section;
 459   /* Information specific to this kind of option.  */
 460   unsigned long info;
 461 } Elf_Internal_Options;
 462
 463 /* MIPS ELF option header swapping routines.  */
 464 extern void bfd_mips_elf_swap_options_in
 465   PARAMS ((bfd *, const Elf_External_Options *, Elf_Internal_Options *));
 466 extern void bfd_mips_elf_swap_options_out
 467   PARAMS ((bfd *, const Elf_Internal_Options *, Elf_External_Options *));
 468
 469 /* Values which may appear in the kind field of an Elf_Options
 470    structure.  */
 471
 472 /* Undefined.  */
 473 #define ODK_NULL        0
 474
 475 /* Register usage and GP value.  */
 476 #define ODK_REGINFO     1
 477
 478 /* Exception processing information.  */
 479 #define ODK_EXCEPTIONS  2
 480
 481 /* Section padding information.  */
 482 #define ODK_PAD         3
 483
 484 /* In the 32 bit ABI, an ODK_REGINFO option is just a Elf32_Reginfo
 485    structure.  In the 64 bit ABI, it is the following structure.  The
 486    info field of the options header is not used.  */
 487
 488 typedef struct
 489 {
 490   /* Mask of general purpose registers used.  */
 491   unsigned char ri_gprmask[4];
 492   /* Padding.  */
 493   unsigned char ri_pad[4];
 494   /* Mask of co-processor registers used.  */
 495   unsigned char ri_cprmask[4][4];
 496   /* GP register value for this object file.  */
 497   unsigned char ri_gp_value[8];
 498 } Elf64_External_RegInfo;
 499
 500 typedef struct
 501 {
 502   /* Mask of general purpose registers used.  */
 503   unsigned long ri_gprmask;
 504   /* Padding.  */
 505   unsigned long ri_pad;
 506   /* Mask of co-processor registers used.  */
 507   unsigned long ri_cprmask[4];
 508   /* GP register value for this object file.  */
 509   bfd_vma ri_gp_value;
 510 } Elf64_Internal_RegInfo;
 511
 512 /* MIPS ELF reginfo swapping routines.  */
 513 extern void bfd_mips_elf64_swap_reginfo_in
 514   PARAMS ((bfd *, const Elf64_External_RegInfo *, Elf64_Internal_RegInfo *));
 515 extern void bfd_mips_elf64_swap_reginfo_out
 516   PARAMS ((bfd *, const Elf64_Internal_RegInfo *, Elf64_External_RegInfo *));
 517
 518 #endif /* _ELF_MIPS_H */