arch/mips/include/asm/elf.h

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  * Much of this is taken from binutils and GNU libc ...
   7  */
   8 #ifndef _ASM_ELF_H
   9 #define _ASM_ELF_H
  10
  11 #include <linux/auxvec.h>
  12 #include <linux/fs.h>
  13 #include <uapi/linux/elf.h>
  14
  15 #include <asm/current.h>
  16
  17 /* ELF header e_flags defines. */
  18 /* MIPS architecture level. */
  19 #define EF_MIPS_ARCH_1          0x00000000      /* -mips1 code.  */
  20 #define EF_MIPS_ARCH_2          0x10000000      /* -mips2 code.  */
  21 #define EF_MIPS_ARCH_3          0x20000000      /* -mips3 code.  */
  22 #define EF_MIPS_ARCH_4          0x30000000      /* -mips4 code.  */
  23 #define EF_MIPS_ARCH_5          0x40000000      /* -mips5 code.  */
  24 #define EF_MIPS_ARCH_32         0x50000000      /* MIPS32 code.  */
  25 #define EF_MIPS_ARCH_64         0x60000000      /* MIPS64 code.  */
  26 #define EF_MIPS_ARCH_32R2       0x70000000      /* MIPS32 R2 code.  */
  27 #define EF_MIPS_ARCH_64R2       0x80000000      /* MIPS64 R2 code.  */
  28
  29 /* The ABI of a file. */
  30 #define EF_MIPS_ABI_O32         0x00001000      /* O32 ABI.  */
  31 #define EF_MIPS_ABI_O64         0x00002000      /* O32 extended for 64 bit.  */
  32
  33 #define PT_MIPS_REGINFO         0x70000000
  34 #define PT_MIPS_RTPROC          0x70000001
  35 #define PT_MIPS_OPTIONS         0x70000002
  36 #define PT_MIPS_ABIFLAGS        0x70000003
  37
  38 /* Flags in the e_flags field of the header */
  39 #define EF_MIPS_NOREORDER       0x00000001
  40 #define EF_MIPS_PIC             0x00000002
  41 #define EF_MIPS_CPIC            0x00000004
  42 #define EF_MIPS_ABI2            0x00000020
  43 #define EF_MIPS_OPTIONS_FIRST   0x00000080
  44 #define EF_MIPS_32BITMODE       0x00000100
  45 #define EF_MIPS_FP64            0x00000200
  46 #define EF_MIPS_NAN2008         0x00000400
  47 #define EF_MIPS_ABI             0x0000f000
  48 #define EF_MIPS_ARCH            0xf0000000
  49
  50 #define DT_MIPS_RLD_VERSION     0x70000001
  51 #define DT_MIPS_TIME_STAMP      0x70000002
  52 #define DT_MIPS_ICHECKSUM       0x70000003
  53 #define DT_MIPS_IVERSION        0x70000004
  54 #define DT_MIPS_FLAGS           0x70000005
  55         #define RHF_NONE        0x00000000
  56         #define RHF_HARDWAY     0x00000001
  57         #define RHF_NOTPOT      0x00000002
  58         #define RHF_SGI_ONLY    0x00000010
  59 #define DT_MIPS_BASE_ADDRESS    0x70000006
  60 #define DT_MIPS_CONFLICT        0x70000008
  61 #define DT_MIPS_LIBLIST         0x70000009
  62 #define DT_MIPS_LOCAL_GOTNO     0x7000000a
  63 #define DT_MIPS_CONFLICTNO      0x7000000b
  64 #define DT_MIPS_LIBLISTNO       0x70000010
  65 #define DT_MIPS_SYMTABNO        0x70000011
  66 #define DT_MIPS_UNREFEXTNO      0x70000012
  67 #define DT_MIPS_GOTSYM          0x70000013
  68 #define DT_MIPS_HIPAGENO        0x70000014
  69 #define DT_MIPS_RLD_MAP         0x70000016
  70
  71 #define R_MIPS_NONE             0
  72 #define R_MIPS_16               1
  73 #define R_MIPS_32               2
  74 #define R_MIPS_REL32            3
  75 #define R_MIPS_26               4
  76 #define R_MIPS_HI16             5
  77 #define R_MIPS_LO16             6
  78 #define R_MIPS_GPREL16          7
  79 #define R_MIPS_LITERAL          8
  80 #define R_MIPS_GOT16            9
  81 #define R_MIPS_PC16             10
  82 #define R_MIPS_CALL16           11
  83 #define R_MIPS_GPREL32          12
  84 /* The remaining relocs are defined on Irix, although they are not
  85    in the MIPS ELF ABI.  */
  86 #define R_MIPS_UNUSED1          13
  87 #define R_MIPS_UNUSED2          14
  88 #define R_MIPS_UNUSED3          15
  89 #define R_MIPS_SHIFT5           16
  90 #define R_MIPS_SHIFT6           17
  91 #define R_MIPS_64               18
  92 #define R_MIPS_GOT_DISP         19
  93 #define R_MIPS_GOT_PAGE         20
  94 #define R_MIPS_GOT_OFST         21
  95 /*
  96  * The following two relocation types are specified in the MIPS ABI
  97  * conformance guide version 1.2 but not yet in the psABI.
  98  */
  99 #define R_MIPS_GOTHI16          22
 100 #define R_MIPS_GOTLO16          23
 101 #define R_MIPS_SUB              24
 102 #define R_MIPS_INSERT_A         25
 103 #define R_MIPS_INSERT_B         26
 104 #define R_MIPS_DELETE           27
 105 #define R_MIPS_HIGHER           28
 106 #define R_MIPS_HIGHEST          29
 107 /*
 108  * The following two relocation types are specified in the MIPS ABI
 109  * conformance guide version 1.2 but not yet in the psABI.
 110  */
 111 #define R_MIPS_CALLHI16         30
 112 #define R_MIPS_CALLLO16         31
 113 /*
 114  * Introduced for MIPSr6.
 115  */
 116 #define R_MIPS_PC21_S2          60
 117 #define R_MIPS_PC26_S2          61
 118 /*
 119  * This range is reserved for vendor specific relocations.
 120  */
 121 #define R_MIPS_LOVENDOR         100
 122 #define R_MIPS_HIVENDOR         127
 123
 124 #define SHN_MIPS_ACCOMON        0xff00          /* Allocated common symbols */
 125 #define SHN_MIPS_TEXT           0xff01          /* Allocated test symbols.  */
 126 #define SHN_MIPS_DATA           0xff02          /* Allocated data symbols.  */
 127 #define SHN_MIPS_SCOMMON        0xff03          /* Small common symbols */
 128 #define SHN_MIPS_SUNDEFINED     0xff04          /* Small undefined symbols */
 129
 130 #define SHT_MIPS_LIST           0x70000000
 131 #define SHT_MIPS_CONFLICT       0x70000002
 132 #define SHT_MIPS_GPTAB          0x70000003
 133 #define SHT_MIPS_UCODE          0x70000004
 134 #define SHT_MIPS_DEBUG          0x70000005
 135 #define SHT_MIPS_REGINFO        0x70000006
 136 #define SHT_MIPS_PACKAGE        0x70000007
 137 #define SHT_MIPS_PACKSYM        0x70000008
 138 #define SHT_MIPS_RELD           0x70000009
 139 #define SHT_MIPS_IFACE          0x7000000b
 140 #define SHT_MIPS_CONTENT        0x7000000c
 141 #define SHT_MIPS_OPTIONS        0x7000000d
 142 #define SHT_MIPS_SHDR           0x70000010
 143 #define SHT_MIPS_FDESC          0x70000011
 144 #define SHT_MIPS_EXTSYM         0x70000012
 145 #define SHT_MIPS_DENSE          0x70000013
 146 #define SHT_MIPS_PDESC          0x70000014
 147 #define SHT_MIPS_LOCSYM         0x70000015
 148 #define SHT_MIPS_AUXSYM         0x70000016
 149 #define SHT_MIPS_OPTSYM         0x70000017
 150 #define SHT_MIPS_LOCSTR         0x70000018
 151 #define SHT_MIPS_LINE           0x70000019
 152 #define SHT_MIPS_RFDESC         0x7000001a
 153 #define SHT_MIPS_DELTASYM       0x7000001b
 154 #define SHT_MIPS_DELTAINST      0x7000001c
 155 #define SHT_MIPS_DELTACLASS     0x7000001d
 156 #define SHT_MIPS_DWARF          0x7000001e
 157 #define SHT_MIPS_DELTADECL      0x7000001f
 158 #define SHT_MIPS_SYMBOL_LIB     0x70000020
 159 #define SHT_MIPS_EVENTS         0x70000021
 160 #define SHT_MIPS_TRANSLATE      0x70000022
 161 #define SHT_MIPS_PIXIE          0x70000023
 162 #define SHT_MIPS_XLATE          0x70000024
 163 #define SHT_MIPS_XLATE_DEBUG    0x70000025
 164 #define SHT_MIPS_WHIRL          0x70000026
 165 #define SHT_MIPS_EH_REGION      0x70000027
 166 #define SHT_MIPS_XLATE_OLD      0x70000028
 167 #define SHT_MIPS_PDR_EXCEPTION  0x70000029
 168
 169 #define SHF_MIPS_GPREL          0x10000000
 170 #define SHF_MIPS_MERGE          0x20000000
 171 #define SHF_MIPS_ADDR           0x40000000
 172 #define SHF_MIPS_STRING         0x80000000
 173 #define SHF_MIPS_NOSTRIP        0x08000000
 174 #define SHF_MIPS_LOCAL          0x04000000
 175 #define SHF_MIPS_NAMES          0x02000000
 176 #define SHF_MIPS_NODUPES        0x01000000
 177
 178 #define MIPS_ABI_FP_ANY         0       /* FP ABI doesn't matter */
 179 #define MIPS_ABI_FP_DOUBLE      1       /* -mdouble-float */
 180 #define MIPS_ABI_FP_SINGLE      2       /* -msingle-float */
 181 #define MIPS_ABI_FP_SOFT        3       /* -msoft-float */
 182 #define MIPS_ABI_FP_OLD_64      4       /* -mips32r2 -mfp64 */
 183 #define MIPS_ABI_FP_XX          5       /* -mfpxx */
 184 #define MIPS_ABI_FP_64          6       /* -mips32r2 -mfp64 */
 185 #define MIPS_ABI_FP_64A         7       /* -mips32r2 -mfp64 -mno-odd-spreg */
 186
 187 struct mips_elf_abiflags_v0 {
 188         uint16_t version;       /* Version of flags structure */
 189         uint8_t isa_level;      /* The level of the ISA: 1-5, 32, 64 */
 190         uint8_t isa_rev;        /* The revision of ISA: 0 for MIPS V and below,
 191                                    1-n otherwise */
 192         uint8_t gpr_size;       /* The size of general purpose registers */
 193         uint8_t cpr1_size;      /* The size of co-processor 1 registers */
 194         uint8_t cpr2_size;      /* The size of co-processor 2 registers */
 195         uint8_t fp_abi;         /* The floating-point ABI */
 196         uint32_t isa_ext;       /* Mask of processor-specific extensions */
 197         uint32_t ases;          /* Mask of ASEs used */
 198         uint32_t flags1;        /* Mask of general flags */
 199         uint32_t flags2;
 200 };
 201
 202 #ifndef ELF_ARCH
 203 /* ELF register definitions */
 204 #define ELF_NGREG       45
 205 #define ELF_NFPREG      33
 206
 207 typedef unsigned long elf_greg_t;
 208 typedef elf_greg_t elf_gregset_t[ELF_NGREG];
 209
 210 typedef double elf_fpreg_t;
 211 typedef elf_fpreg_t elf_fpregset_t[ELF_NFPREG];
 212
 213 #ifdef CONFIG_32BIT
 214 /*
 215  * This is used to ensure we don't load something for the wrong architecture.
 216  */
 217 #define elf_check_arch elfo32_check_arch
 218
 219 /*
 220  * These are used to set parameters in the core dumps.
 221  */
 222 #define ELF_CLASS       ELFCLASS32
 223
 224 #endif /* CONFIG_32BIT */
 225
 226 #ifdef CONFIG_64BIT
 227 /*
 228  * This is used to ensure we don't load something for the wrong architecture.
 229  */
 230 #define elf_check_arch elfn64_check_arch
 231
 232 /*
 233  * These are used to set parameters in the core dumps.
 234  */
 235 #define ELF_CLASS       ELFCLASS64
 236
 237 #endif /* CONFIG_64BIT */
 238
 239 /*
 240  * These are used to set parameters in the core dumps.
 241  */
 242 #ifdef __MIPSEB__
 243 #define ELF_DATA        ELFDATA2MSB
 244 #elif defined(__MIPSEL__)
 245 #define ELF_DATA        ELFDATA2LSB
 246 #endif
 247 #define ELF_ARCH        EM_MIPS
 248
 249 #endif /* !defined(ELF_ARCH) */
 250
 251 /*
 252  * In order to be sure that we don't attempt to execute an O32 binary which
 253  * requires 64 bit FP (FR=1) on a system which does not support it we refuse
 254  * to execute any binary which has bits specified by the following macro set
 255  * in its ELF header flags.
 256  */
 257 #ifdef CONFIG_MIPS_O32_FP64_SUPPORT
 258 # define __MIPS_O32_FP64_MUST_BE_ZERO   0
 259 #else
 260 # define __MIPS_O32_FP64_MUST_BE_ZERO   EF_MIPS_FP64
 261 #endif
 262
 263 #define mips_elf_check_machine(x) ((x)->e_machine == EM_MIPS)
 264
 265 #define vmcore_elf32_check_arch mips_elf_check_machine
 266 #define vmcore_elf64_check_arch mips_elf_check_machine
 267
 268 /*
 269  * Return non-zero if HDR identifies an o32 ELF binary.
 270  */
 271 #define elfo32_check_arch(hdr)                                          \
 272 ({                                                                      \
 273         int __res = 1;                                                  \
 274         struct elfhdr *__h = (hdr);                                     \
 275                                                                         \
 276         if (!mips_elf_check_machine(__h))                               \
 277                 __res = 0;                                              \
 278         if (__h->e_ident[EI_CLASS] != ELFCLASS32)                       \
 279                 __res = 0;                                              \
 280         if ((__h->e_flags & EF_MIPS_ABI2) != 0)                         \
 281                 __res = 0;                                              \
 282         if (((__h->e_flags & EF_MIPS_ABI) != 0) &&                      \
 283             ((__h->e_flags & EF_MIPS_ABI) != EF_MIPS_ABI_O32))          \
 284                 __res = 0;                                              \
 285         if (__h->e_flags & __MIPS_O32_FP64_MUST_BE_ZERO)                \
 286                 __res = 0;                                              \
 287                                                                         \
 288         __res;                                                          \
 289 })
 290
 291 /*
 292  * Return non-zero if HDR identifies an n64 ELF binary.
 293  */
 294 #define elfn64_check_arch(hdr)                                          \
 295 ({                                                                      \
 296         int __res = 1;                                                  \
 297         struct elfhdr *__h = (hdr);                                     \
 298                                                                         \
 299         if (!mips_elf_check_machine(__h))                               \
 300                 __res = 0;                                              \
 301         if (__h->e_ident[EI_CLASS] != ELFCLASS64)                       \
 302                 __res = 0;                                              \
 303                                                                         \
 304         __res;                                                          \
 305 })
 306
 307 /*
 308  * Return non-zero if HDR identifies an n32 ELF binary.
 309  */
 310 #define elfn32_check_arch(hdr)                                          \
 311 ({                                                                      \
 312         int __res = 1;                                                  \
 313         struct elfhdr *__h = (hdr);                                     \
 314                                                                         \
 315         if (!mips_elf_check_machine(__h))                               \
 316                 __res = 0;                                              \
 317         if (__h->e_ident[EI_CLASS] != ELFCLASS32)                       \
 318                 __res = 0;                                              \
 319         if (((__h->e_flags & EF_MIPS_ABI2) == 0) ||                     \
 320             ((__h->e_flags & EF_MIPS_ABI) != 0))                        \
 321                 __res = 0;                                              \
 322                                                                         \
 323         __res;                                                          \
 324 })
 325
 326 struct mips_abi;
 327
 328 extern struct mips_abi mips_abi;
 329 extern struct mips_abi mips_abi_32;
 330 extern struct mips_abi mips_abi_n32;
 331
 332 #ifdef CONFIG_32BIT
 333
 334 #define SET_PERSONALITY2(ex, state)                                     \
 335 do {                                                                    \
 336         clear_thread_flag(TIF_HYBRID_FPREGS);                           \
 337         set_thread_flag(TIF_32BIT_FPREGS);                              \
 338                                                                         \
 339         current->thread.abi = &mips_abi;                                \
 340                                                                         \
 341         mips_set_personality_fp(state);                                 \
 342         mips_set_personality_nan(state);                                \
 343                                                                         \
 344         if (personality(current->personality) != PER_LINUX)             \
 345                 set_personality(PER_LINUX);                             \
 346 } while (0)
 347
 348 #endif /* CONFIG_32BIT */
 349
 350 #ifdef CONFIG_64BIT
 351
 352 #ifdef CONFIG_MIPS32_N32
 353 #define __SET_PERSONALITY32_N32()                                       \
 354         do {                                                            \
 355                 set_thread_flag(TIF_32BIT_ADDR);                        \
 356                                                                         \
 357                 current->thread.abi = &mips_abi_n32;                    \
 358         } while (0)
 359 #else
 360 #define __SET_PERSONALITY32_N32()                                       \
 361         do { } while (0)
 362 #endif
 363
 364 #ifdef CONFIG_MIPS32_O32
 365 #define __SET_PERSONALITY32_O32(ex, state)                              \
 366         do {                                                            \
 367                 set_thread_flag(TIF_32BIT_REGS);                        \
 368                 set_thread_flag(TIF_32BIT_ADDR);                        \
 369                 clear_thread_flag(TIF_HYBRID_FPREGS);                   \
 370                 set_thread_flag(TIF_32BIT_FPREGS);                      \
 371                                                                         \
 372                 current->thread.abi = &mips_abi_32;                     \
 373                                                                         \
 374                 mips_set_personality_fp(state);                         \
 375         } while (0)
 376 #else
 377 #define __SET_PERSONALITY32_O32(ex, state)                              \
 378         do { } while (0)
 379 #endif
 380
 381 #ifdef CONFIG_MIPS32_COMPAT
 382 #define __SET_PERSONALITY32(ex, state)                                  \
 383 do {                                                                    \
 384         if ((((ex).e_flags & EF_MIPS_ABI2) != 0) &&                     \
 385              ((ex).e_flags & EF_MIPS_ABI) == 0)                         \
 386                 __SET_PERSONALITY32_N32();                              \
 387         else                                                            \
 388                 __SET_PERSONALITY32_O32(ex, state);                     \
 389 } while (0)
 390 #else
 391 #define __SET_PERSONALITY32(ex, state) do { } while (0)
 392 #endif
 393
 394 #define SET_PERSONALITY2(ex, state)                                     \
 395 do {                                                                    \
 396         unsigned int p;                                                 \
 397                                                                         \
 398         clear_thread_flag(TIF_32BIT_REGS);                              \
 399         clear_thread_flag(TIF_32BIT_FPREGS);                            \
 400         clear_thread_flag(TIF_HYBRID_FPREGS);                           \
 401         clear_thread_flag(TIF_32BIT_ADDR);                              \
 402                                                                         \
 403         if ((ex).e_ident[EI_CLASS] == ELFCLASS32)                       \
 404                 __SET_PERSONALITY32(ex, state);                         \
 405         else                                                            \
 406                 current->thread.abi = &mips_abi;                        \
 407                                                                         \
 408         mips_set_personality_nan(state);                                \
 409                                                                         \
 410         p = personality(current->personality);                          \
 411         if (p != PER_LINUX32 && p != PER_LINUX)                         \
 412                 set_personality(PER_LINUX);                             \
 413 } while (0)
 414
 415 #endif /* CONFIG_64BIT */
 416
 417 #define CORE_DUMP_USE_REGSET
 418 #define ELF_EXEC_PAGESIZE       PAGE_SIZE
 419
 420 /* This yields a mask that user programs can use to figure out what
 421    instruction set this cpu supports.  This could be done in userspace,
 422    but it's not easy, and we've already done it here.  */
 423
 424 #define ELF_HWCAP       (elf_hwcap)
 425 extern unsigned int elf_hwcap;
 426 #include <asm/hwcap.h>
 427
 428 /*
 429  * This yields a string that ld.so will use to load implementation
 430  * specific libraries for optimization.  This is more specific in
 431  * intent than poking at uname or /proc/cpuinfo.
 432  */
 433
 434 #define ELF_PLATFORM  __elf_platform
 435 extern const char *__elf_platform;
 436
 437 /*
 438  * See comments in asm-alpha/elf.h, this is the same thing
 439  * on the MIPS.
 440  */
 441 #define ELF_PLAT_INIT(_r, load_addr)    do { \
 442         _r->regs[1] = _r->regs[2] = _r->regs[3] = _r->regs[4] = 0;      \
 443         _r->regs[5] = _r->regs[6] = _r->regs[7] = _r->regs[8] = 0;      \
 444         _r->regs[9] = _r->regs[10] = _r->regs[11] = _r->regs[12] = 0;   \
 445         _r->regs[13] = _r->regs[14] = _r->regs[15] = _r->regs[16] = 0;  \
 446         _r->regs[17] = _r->regs[18] = _r->regs[19] = _r->regs[20] = 0;  \
 447         _r->regs[21] = _r->regs[22] = _r->regs[23] = _r->regs[24] = 0;  \
 448         _r->regs[25] = _r->regs[26] = _r->regs[27] = _r->regs[28] = 0;  \
 449         _r->regs[30] = _r->regs[31] = 0;                                \
 450 } while (0)
 451
 452 /* This is the location that an ET_DYN program is loaded if exec'ed.  Typical
 453    use of this is to invoke "./ld.so someprog" to test out a new version of
 454    the loader.  We need to make sure that it is out of the way of the program
 455    that it will "exec", and that there is sufficient room for the brk.  */
 456
 457 #ifndef ELF_ET_DYN_BASE
 458 #define ELF_ET_DYN_BASE         (TASK_SIZE / 3 * 2)
 459 #endif
 460
 461 /* update AT_VECTOR_SIZE_ARCH if the number of NEW_AUX_ENT entries changes */
 462 #define ARCH_DLINFO                                                     \
 463 do {                                                                    \
 464         NEW_AUX_ENT(AT_SYSINFO_EHDR,                                    \
 465                     (unsigned long)current->mm->context.vdso);          \
 466 } while (0)
 467
 468 #define ARCH_HAS_SETUP_ADDITIONAL_PAGES 1
 469 struct linux_binprm;
 470 extern int arch_setup_additional_pages(struct linux_binprm *bprm,
 471                                        int uses_interp);
 472
 473 struct arch_elf_state {
 474         int nan_2008;
 475         int fp_abi;
 476         int interp_fp_abi;
 477         int overall_fp_mode;
 478 };
 479
 480 #define MIPS_ABI_FP_UNKNOWN     (-1)    /* Unknown FP ABI (kernel internal) */
 481
 482 #define INIT_ARCH_ELF_STATE {                   \
 483         .nan_2008 = -1,                         \
 484         .fp_abi = MIPS_ABI_FP_UNKNOWN,          \
 485         .interp_fp_abi = MIPS_ABI_FP_UNKNOWN,   \
 486         .overall_fp_mode = -1,                  \
 487 }
 488
 489 /* Whether to accept legacy-NaN and 2008-NaN user binaries.  */
 490 extern bool mips_use_nan_legacy;
 491 extern bool mips_use_nan_2008;
 492
 493 extern int arch_elf_pt_proc(void *ehdr, void *phdr, struct file *elf,
 494                             bool is_interp, struct arch_elf_state *state);
 495
 496 extern int arch_check_elf(void *ehdr, bool has_interpreter, void *interp_ehdr,
 497                           struct arch_elf_state *state);
 498
 499 extern void mips_set_personality_nan(struct arch_elf_state *state);
 500 extern void mips_set_personality_fp(struct arch_elf_state *state);
 501
 502 #define elf_read_implies_exec(ex, stk) mips_elf_read_implies_exec(&(ex), stk)
 503 extern int mips_elf_read_implies_exec(void *elf_ex, int exstack);
 504
 505 #endif /* _ASM_ELF_H */