include/elf/mips.h

   1 /* MIPS ELF support for BFD.
   2    Copyright (C) 1993, 1994 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 /* Four bit MIPS architecture field.  */
  43 #define EF_MIPS_ARCH            0xf0000000
  44
  45 /* -mips1 code.  */
  46 #define E_MIPS_ARCH_1           0x00000000
  47
  48 /* -mips2 code.  */
  49 #define E_MIPS_ARCH_2           0x10000000
  50
  51 /* -mips3 code.  */
  52 #define E_MIPS_ARCH_3           0x20000000
  53
  54 /* -mips4 code.  */
  55 #define E_MIPS_ARCH_4           0x30000000
  56 \f
  57 /* Processor specific section indices.  These sections do not actually
  58    exist.  Symbols with a st_shndx field corresponding to one of these
  59    values have a special meaning.  */
  60
  61 /* Defined and allocated common symbol.  Value is virtual address.  If
  62    relocated, alignment must be preserved.  */
  63 #define SHN_MIPS_ACOMMON        0xff00
  64
  65 /* Defined and allocated text symbol.  Value is virtual address.
  66    Occur in the dynamic symbol table of Alpha OSF/1 and Irix 5 executables.  */
  67 #define SHN_MIPS_TEXT           0xff01
  68
  69 /* Defined and allocated data symbol.  Value is virtual address.
  70    Occur in the dynamic symbol table of Alpha OSF/1 and Irix 5 executables.  */
  71 #define SHN_MIPS_DATA           0xff02
  72
  73 /* Small common symbol.  */
  74 #define SHN_MIPS_SCOMMON        0xff03
  75
  76 /* Small undefined symbol.  */
  77 #define SHN_MIPS_SUNDEFINED     0xff04
  78 \f
  79 /* Processor specific section types.  */
  80
  81 /* Section contains the set of dynamic shared objects used when
  82    statically linking.  */
  83 #define SHT_MIPS_LIBLIST        0x70000000
  84
  85 /* I'm not sure what this is, but it's used on Irix 5.  */
  86 #define SHT_MIPS_MSYM           0x70000001
  87
  88 /* Section contains list of symbols whose definitions conflict with
  89    symbols defined in shared objects.  */
  90 #define SHT_MIPS_CONFLICT       0x70000002
  91
  92 /* Section contains the global pointer table.  */
  93 #define SHT_MIPS_GPTAB          0x70000003
  94
  95 /* Section contains microcode information.  The exact format is
  96    unspecified.  */
  97 #define SHT_MIPS_UCODE          0x70000004
  98
  99 /* Section contains some sort of debugging information.  The exact
 100    format is unspecified.  It's probably ECOFF symbols.  */
 101 #define SHT_MIPS_DEBUG          0x70000005
 102
 103 /* Section contains register usage information.  */
 104 #define SHT_MIPS_REGINFO        0x70000006
 105
 106 /* Section contains miscellaneous options (used on Irix).  */
 107 #define SHT_MIPS_OPTIONS        0x7000000d
 108
 109 /* DWARF debugging section (used on Irix 6).  */
 110 #define SHT_MIPS_DWARF          0x7000001e
 111
 112 /* Events section.  This appears on Irix 6.  I don't know what it
 113    means.  */
 114 #define SHT_MIPS_EVENTS         0x70000021
 115
 116 /* A section of type SHT_MIPS_LIBLIST contains an array of the
 117    following structure.  The sh_link field is the section index of the
 118    string table.  The sh_info field is the number of entries in the
 119    section.  */
 120 typedef struct
 121 {
 122   /* String table index for name of shared object.  */
 123   unsigned long l_name;
 124   /* Time stamp.  */
 125   unsigned long l_time_stamp;
 126   /* Checksum of symbol names and common sizes.  */
 127   unsigned long l_checksum;
 128   /* String table index for version.  */
 129   unsigned long l_version;
 130   /* Flags.  */
 131   unsigned long l_flags;
 132 } Elf32_Lib;
 133
 134 /* The l_flags field of an Elf32_Lib structure may contain the
 135    following flags.  */
 136
 137 /* Require an exact match at runtime.  */
 138 #define LL_EXACT_MATCH          0x00000001
 139
 140 /* Ignore version incompatibilities at runtime.  */
 141 #define LL_IGNORE_INT_VER       0x00000002
 142
 143 /* A section of type SHT_MIPS_CONFLICT is an array of indices into the
 144    .dynsym section.  Each element has the following type.  */
 145 typedef unsigned long Elf32_Conflict;
 146
 147 /* A section of type SHT_MIPS_GPTAB contains information about how
 148    much GP space would be required for different -G arguments.  This
 149    information is only used so that the linker can provide informative
 150    suggestions as to the best -G value to use.  The sh_info field is
 151    the index of the section for which this information applies.  The
 152    contents of the section are an array of the following union.  The
 153    first element uses the gt_header field.  The remaining elements use
 154    the gt_entry field.  */
 155 typedef union
 156 {
 157   struct
 158     {
 159       /* -G value actually used for this object file.  */
 160       unsigned long gt_current_g_value;
 161       /* Unused.  */
 162       unsigned long gt_unused;
 163     } gt_header;
 164   struct
 165     {
 166       /* If this -G argument has been used...  */
 167       unsigned long gt_g_value;
 168       /* ...this many GP section bytes would be required.  */
 169       unsigned long gt_bytes;
 170     } gt_entry;
 171 } Elf32_gptab;
 172
 173 /* The external version of Elf32_gptab.  */
 174
 175 typedef union
 176 {
 177   struct
 178     {
 179       unsigned char gt_current_g_value[4];
 180       unsigned char gt_unused[4];
 181     } gt_header;
 182   struct
 183     {
 184       unsigned char gt_g_value[4];
 185       unsigned char gt_bytes[4];
 186     } gt_entry;
 187 } Elf32_External_gptab;
 188
 189 /* A section of type SHT_MIPS_REGINFO contains the following
 190    structure.  */
 191 typedef struct
 192 {
 193   /* Mask of general purpose registers used.  */
 194   unsigned long ri_gprmask;
 195   /* Mask of co-processor registers used.  */
 196   unsigned long ri_cprmask[4];
 197   /* GP register value for this object file.  */
 198   long ri_gp_value;
 199 } Elf32_RegInfo;
 200
 201 /* The external version of the Elf_RegInfo structure.  */
 202 typedef struct
 203 {
 204   unsigned char ri_gprmask[4];
 205   unsigned char ri_cprmask[4][4];
 206   unsigned char ri_gp_value[4];
 207 } Elf32_External_RegInfo;
 208
 209 /* MIPS ELF .reginfo swapping routines.  */
 210 extern void bfd_mips_elf32_swap_reginfo_in
 211   PARAMS ((bfd *, const Elf32_External_RegInfo *, Elf32_RegInfo *));
 212 extern void bfd_mips_elf32_swap_reginfo_out
 213   PARAMS ((bfd *, const Elf32_RegInfo *, Elf32_External_RegInfo *));
 214 \f
 215 /* Processor specific section flags.  */
 216
 217 /* This section must be in the global data area.  */
 218 #define SHF_MIPS_GPREL          0x10000000
 219 \f
 220 /* Processor specific program header types.  */
 221
 222 /* Register usage information.  Identifies one .reginfo section.  */
 223 #define PT_MIPS_REGINFO         0x70000000
 224
 225 /* Runtime procedure table.  */
 226 #define PT_MIPS_RTPROC          0x70000001
 227 \f
 228 /* Processor specific dynamic array tags.  */
 229
 230 /* 32 bit version number for runtime linker interface.  */
 231 #define DT_MIPS_RLD_VERSION     0x70000001
 232
 233 /* Time stamp.  */
 234 #define DT_MIPS_TIME_STAMP      0x70000002
 235
 236 /* Checksum of external strings and common sizes.  */
 237 #define DT_MIPS_ICHECKSUM       0x70000003
 238
 239 /* Index of version string in string table.  */
 240 #define DT_MIPS_IVERSION        0x70000004
 241
 242 /* 32 bits of flags.  */
 243 #define DT_MIPS_FLAGS           0x70000005
 244
 245 /* Base address of the segment.  */
 246 #define DT_MIPS_BASE_ADDRESS    0x70000006
 247
 248 /* Address of .conflict section.  */
 249 #define DT_MIPS_CONFLICT        0x70000008
 250
 251 /* Address of .liblist section.  */
 252 #define DT_MIPS_LIBLIST         0x70000009
 253
 254 /* Number of local global offset table entries.  */
 255 #define DT_MIPS_LOCAL_GOTNO     0x7000000a
 256
 257 /* Number of entries in the .conflict section.  */
 258 #define DT_MIPS_CONFLICTNO      0x7000000b
 259
 260 /* Number of entries in the .liblist section.  */
 261 #define DT_MIPS_LIBLISTNO       0x70000010
 262
 263 /* Number of entries in the .dynsym section.  */
 264 #define DT_MIPS_SYMTABNO        0x70000011
 265
 266 /* Index of first external dynamic symbol not referenced locally.  */
 267 #define DT_MIPS_UNREFEXTNO      0x70000012
 268
 269 /* Index of first dynamic symbol in global offset table.  */
 270 #define DT_MIPS_GOTSYM          0x70000013
 271
 272 /* Number of page table entries in global offset table.  */
 273 #define DT_MIPS_HIPAGENO        0x70000014
 274
 275 /* Address of run time loader map, used for debugging.  */
 276 #define DT_MIPS_RLD_MAP         0x70000016
 277 \f
 278 /* Flags which may appear in a DT_MIPS_FLAGS entry.  */
 279
 280 /* No flags.  */
 281 #define RHF_NONE                0x00000000
 282
 283 /* Uses shortcut pointers.  */
 284 #define RHF_QUICKSTART          0x00000001
 285
 286 /* Hash size is not a power of two.  */
 287 #define RHF_NOTPOT              0x00000002
 288
 289 /* Ignore LD_LIBRARY_PATH.  */
 290 #define RHS_NO_LIBRARY_REPLACEMENT \
 291                                 0x00000004
 292 \f
 293 /* Special values for the st_other field in the symbol table.  These
 294    are used in an Irix 5 dynamic symbol table.  */
 295
 296 #define STO_DEFAULT             0x00
 297 #define STO_INTERNAL            0x01
 298 #define STO_HIDDEN              0x02
 299 #define STO_PROTECTED           0x03
 300 \f
 301 /* The 64-bit MIPS ELF ABI uses an usual reloc format.  Each
 302    relocation entry specifies up to three actual relocations, all at
 303    the same address.  The first relocation which required a symbol
 304    uses the symbol in the r_sym field.  The second relocation which
 305    requires a symbol uses the symbol in the r_ssym field.  If all
 306    three relocations require a symbol, the third one uses a zero
 307    value.  */
 308
 309 /* An entry in a 64 bit SHT_REL section.  */
 310
 311 typedef struct
 312 {
 313   /* Address of relocation.  */
 314   unsigned char r_offset[8];
 315   /* Symbol index.  */
 316   unsigned char r_sym[4];
 317   /* Special symbol.  */
 318   unsigned char r_ssym[1];
 319   /* Third relocation.  */
 320   unsigned char r_type3[1];
 321   /* Second relocation.  */
 322   unsigned char r_type2[1];
 323   /* First relocation.  */
 324   unsigned char r_type[1];
 325 } Elf64_Mips_External_Rel;
 326
 327 typedef struct
 328 {
 329   /* Address of relocation.  */
 330   bfd_vma r_offset;
 331   /* Symbol index.  */
 332   unsigned long r_sym;
 333   /* Special symbol.  */
 334   unsigned char r_ssym;
 335   /* Third relocation.  */
 336   unsigned char r_type3;
 337   /* Second relocation.  */
 338   unsigned char r_type2;
 339   /* First relocation.  */
 340   unsigned char r_type;
 341 } Elf64_Mips_Internal_Rel;
 342
 343 /* An entry in a 64 bit SHT_RELA section.  */
 344
 345 typedef struct
 346 {
 347   /* Address of relocation.  */
 348   unsigned char r_offset[8];
 349   /* Symbol index.  */
 350   unsigned char r_sym[4];
 351   /* Special symbol.  */
 352   unsigned char r_ssym[1];
 353   /* Third relocation.  */
 354   unsigned char r_type3[1];
 355   /* Second relocation.  */
 356   unsigned char r_type2[1];
 357   /* First relocation.  */
 358   unsigned char r_type[1];
 359   /* Addend.  */
 360   unsigned char r_addend[8];
 361 } Elf64_Mips_External_Rela;
 362
 363 typedef struct
 364 {
 365   /* Address of relocation.  */
 366   bfd_vma r_offset;
 367   /* Symbol index.  */
 368   unsigned long r_sym;
 369   /* Special symbol.  */
 370   unsigned char r_ssym;
 371   /* Third relocation.  */
 372   unsigned char r_type3;
 373   /* Second relocation.  */
 374   unsigned char r_type2;
 375   /* First relocation.  */
 376   unsigned char r_type;
 377   /* Addend.  */
 378   bfd_signed_vma r_addend;
 379 } Elf64_Mips_Internal_Rela;
 380
 381 /* Values found in the r_ssym field of a relocation entry.  */
 382
 383 /* No relocation.  */
 384 #define RSS_UNDEF       0
 385
 386 /* Value of GP.  */
 387 #define RSS_GP          1
 388
 389 /* Value of GP in object being relocated.  */
 390 #define RSS_GP0         2
 391
 392 /* Address of location being relocated.  */
 393 #define RSS_LOC         3
 394
 395 #endif /* _ELF_MIPS_H */