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 #ifndef ELF_ARCH
 179 /* ELF register definitions */
 180 #define ELF_NGREG       45
 181 #define ELF_NFPREG      33
 182
 183 typedef unsigned long elf_greg_t;
 184 typedef elf_greg_t elf_gregset_t[ELF_NGREG];
 185
 186 typedef double elf_fpreg_t;
 187 typedef elf_fpreg_t elf_fpregset_t[ELF_NFPREG];
 188
 189 struct mips_elf_abiflags_v0 {
 190         uint16_t version;       /* Version of flags structure */
 191         uint8_t isa_level;      /* The level of the ISA: 1-5, 32, 64 */
 192         uint8_t isa_rev;        /* The revision of ISA: 0 for MIPS V and below,
 193                                    1-n otherwise */
 194         uint8_t gpr_size;       /* The size of general purpose registers */
 195         uint8_t cpr1_size;      /* The size of co-processor 1 registers */
 196         uint8_t cpr2_size;      /* The size of co-processor 2 registers */
 197         uint8_t fp_abi;         /* The floating-point ABI */
 198         uint32_t isa_ext;       /* Mask of processor-specific extensions */
 199         uint32_t ases;          /* Mask of ASEs used */
 200         uint32_t flags1;        /* Mask of general flags */
 201         uint32_t flags2;
 202 };
 203
 204 #define MIPS_ABI_FP_ANY         0       /* FP ABI doesn't matter */
 205 #define MIPS_ABI_FP_DOUBLE      1       /* -mdouble-float */
 206 #define MIPS_ABI_FP_SINGLE      2       /* -msingle-float */
 207 #define MIPS_ABI_FP_SOFT        3       /* -msoft-float */
 208 #define MIPS_ABI_FP_OLD_64      4       /* -mips32r2 -mfp64 */
 209 #define MIPS_ABI_FP_XX          5       /* -mfpxx */
 210 #define MIPS_ABI_FP_64          6       /* -mips32r2 -mfp64 */
 211 #define MIPS_ABI_FP_64A         7       /* -mips32r2 -mfp64 -mno-odd-spreg */
 212
 213 #ifdef CONFIG_32BIT
 214
 215 /*
 216  * In order to be sure that we don't attempt to execute an O32 binary which
 217  * requires 64 bit FP (FR=1) on a system which does not support it we refuse
 218  * to execute any binary which has bits specified by the following macro set
 219  * in its ELF header flags.
 220  */
 221 #ifdef CONFIG_MIPS_O32_FP64_SUPPORT
 222 # define __MIPS_O32_FP64_MUST_BE_ZERO   0
 223 #else
 224 # define __MIPS_O32_FP64_MUST_BE_ZERO   EF_MIPS_FP64
 225 #endif
 226
 227 /*
 228  * This is used to ensure we don't load something for the wrong architecture.
 229  */
 230 #define elf_check_arch(hdr)                                             \
 231 ({                                                                      \
 232         int __res = 1;                                                  \
 233         struct elfhdr *__h = (hdr);                                     \
 234                                                                         \
 235         if (!mips_elf_check_machine(__h))                               \
 236                 __res = 0;                                              \
 237         if (__h->e_ident[EI_CLASS] != ELFCLASS32)                       \
 238                 __res = 0;                                              \
 239         if ((__h->e_flags & EF_MIPS_ABI2) != 0)                         \
 240                 __res = 0;                                              \
 241         if (((__h->e_flags & EF_MIPS_ABI) != 0) &&                      \
 242             ((__h->e_flags & EF_MIPS_ABI) != EF_MIPS_ABI_O32))          \
 243                 __res = 0;                                              \
 244         if (__h->e_flags & __MIPS_O32_FP64_MUST_BE_ZERO)                \
 245                 __res = 0;                                              \
 246                                                                         \
 247         __res;                                                          \
 248 })
 249
 250 /*
 251  * These are used to set parameters in the core dumps.
 252  */
 253 #define ELF_CLASS       ELFCLASS32
 254
 255 #endif /* CONFIG_32BIT */
 256
 257 #ifdef CONFIG_64BIT
 258 /*
 259  * This is used to ensure we don't load something for the wrong architecture.
 260  */
 261 #define elf_check_arch(hdr)                                             \
 262 ({                                                                      \
 263         int __res = 1;                                                  \
 264         struct elfhdr *__h = (hdr);                                     \
 265                                                                         \
 266         if (!mips_elf_check_machine(__h))                               \
 267                 __res = 0;                                              \
 268         if (__h->e_ident[EI_CLASS] != ELFCLASS64)                       \
 269                 __res = 0;                                              \
 270                                                                         \
 271         __res;                                                          \
 272 })
 273
 274 /*
 275  * These are used to set parameters in the core dumps.
 276  */
 277 #define ELF_CLASS       ELFCLASS64
 278
 279 #endif /* CONFIG_64BIT */
 280
 281 /*
 282  * These are used to set parameters in the core dumps.
 283  */
 284 #ifdef __MIPSEB__
 285 #define ELF_DATA        ELFDATA2MSB
 286 #elif defined(__MIPSEL__)
 287 #define ELF_DATA        ELFDATA2LSB
 288 #endif
 289 #define ELF_ARCH        EM_MIPS
 290
 291 #endif /* !defined(ELF_ARCH) */
 292
 293 #define mips_elf_check_machine(x) ((x)->e_machine == EM_MIPS)
 294
 295 #define vmcore_elf32_check_arch mips_elf_check_machine
 296 #define vmcore_elf64_check_arch mips_elf_check_machine
 297
 298 struct mips_abi;
 299
 300 extern struct mips_abi mips_abi;
 301 extern struct mips_abi mips_abi_32;
 302 extern struct mips_abi mips_abi_n32;
 303
 304 #ifdef CONFIG_32BIT
 305
 306 #define SET_PERSONALITY2(ex, state)                                     \
 307 do {                                                                    \
 308         clear_thread_flag(TIF_HYBRID_FPREGS);                           \
 309         set_thread_flag(TIF_32BIT_FPREGS);                              \
 310                                                                         \
 311         current->thread.abi = &mips_abi;                                \
 312                                                                         \
 313         mips_set_personality_fp(state);                                 \
 314         mips_set_personality_nan(state);                                \
 315                                                                         \
 316         if (personality(current->personality) != PER_LINUX)             \
 317                 set_personality(PER_LINUX);                             \
 318 } while (0)
 319
 320 #endif /* CONFIG_32BIT */
 321
 322 #ifdef CONFIG_64BIT
 323
 324 #ifdef CONFIG_MIPS32_N32
 325 #define __SET_PERSONALITY32_N32()                                       \
 326         do {                                                            \
 327                 set_thread_flag(TIF_32BIT_ADDR);                        \
 328                                                                         \
 329                 current->thread.abi = &mips_abi_n32;                    \
 330         } while (0)
 331 #else
 332 #define __SET_PERSONALITY32_N32()                                       \
 333         do { } while (0)
 334 #endif
 335
 336 #ifdef CONFIG_MIPS32_O32
 337 #define __SET_PERSONALITY32_O32(ex, state)                              \
 338         do {                                                            \
 339                 set_thread_flag(TIF_32BIT_REGS);                        \
 340                 set_thread_flag(TIF_32BIT_ADDR);                        \
 341                 clear_thread_flag(TIF_HYBRID_FPREGS);                   \
 342                 set_thread_flag(TIF_32BIT_FPREGS);                      \
 343                                                                         \
 344                 current->thread.abi = &mips_abi_32;                     \
 345                                                                         \
 346                 mips_set_personality_fp(state);                         \
 347         } while (0)
 348 #else
 349 #define __SET_PERSONALITY32_O32(ex, state)                              \
 350         do { } while (0)
 351 #endif
 352
 353 #ifdef CONFIG_MIPS32_COMPAT
 354 #define __SET_PERSONALITY32(ex, state)                                  \
 355 do {                                                                    \
 356         if ((((ex).e_flags & EF_MIPS_ABI2) != 0) &&                     \
 357              ((ex).e_flags & EF_MIPS_ABI) == 0)                         \
 358                 __SET_PERSONALITY32_N32();                              \
 359         else                                                            \
 360                 __SET_PERSONALITY32_O32(ex, state);                     \
 361 } while (0)
 362 #else
 363 #define __SET_PERSONALITY32(ex, state) do { } while (0)
 364 #endif
 365
 366 #define SET_PERSONALITY2(ex, state)                                     \
 367 do {                                                                    \
 368         unsigned int p;                                                 \
 369                                                                         \
 370         clear_thread_flag(TIF_32BIT_REGS);                              \
 371         clear_thread_flag(TIF_32BIT_FPREGS);                            \
 372         clear_thread_flag(TIF_HYBRID_FPREGS);                           \
 373         clear_thread_flag(TIF_32BIT_ADDR);                              \
 374                                                                         \
 375         if ((ex).e_ident[EI_CLASS] == ELFCLASS32)                       \
 376                 __SET_PERSONALITY32(ex, state);                         \
 377         else                                                            \
 378                 current->thread.abi = &mips_abi;                        \
 379                                                                         \
 380         mips_set_personality_nan(state);                                \
 381                                                                         \
 382         p = personality(current->personality);                          \
 383         if (p != PER_LINUX32 && p != PER_LINUX)                         \
 384                 set_personality(PER_LINUX);                             \
 385 } while (0)
 386
 387 #endif /* CONFIG_64BIT */
 388
 389 #define CORE_DUMP_USE_REGSET
 390 #define ELF_EXEC_PAGESIZE       PAGE_SIZE
 391
 392 /* This yields a mask that user programs can use to figure out what
 393    instruction set this cpu supports.  This could be done in userspace,
 394    but it's not easy, and we've already done it here.  */
 395
 396 #define ELF_HWCAP       (elf_hwcap)
 397 extern unsigned int elf_hwcap;
 398 #include <asm/hwcap.h>
 399
 400 /*
 401  * This yields a string that ld.so will use to load implementation
 402  * specific libraries for optimization.  This is more specific in
 403  * intent than poking at uname or /proc/cpuinfo.
 404  */
 405
 406 #define ELF_PLATFORM  __elf_platform
 407 extern const char *__elf_platform;
 408
 409 /*
 410  * See comments in asm-alpha/elf.h, this is the same thing
 411  * on the MIPS.
 412  */
 413 #define ELF_PLAT_INIT(_r, load_addr)    do { \
 414         _r->regs[1] = _r->regs[2] = _r->regs[3] = _r->regs[4] = 0;      \
 415         _r->regs[5] = _r->regs[6] = _r->regs[7] = _r->regs[8] = 0;      \
 416         _r->regs[9] = _r->regs[10] = _r->regs[11] = _r->regs[12] = 0;   \
 417         _r->regs[13] = _r->regs[14] = _r->regs[15] = _r->regs[16] = 0;  \
 418         _r->regs[17] = _r->regs[18] = _r->regs[19] = _r->regs[20] = 0;  \
 419         _r->regs[21] = _r->regs[22] = _r->regs[23] = _r->regs[24] = 0;  \
 420         _r->regs[25] = _r->regs[26] = _r->regs[27] = _r->regs[28] = 0;  \
 421         _r->regs[30] = _r->regs[31] = 0;                                \
 422 } while (0)
 423
 424 /* This is the location that an ET_DYN program is loaded if exec'ed.  Typical
 425    use of this is to invoke "./ld.so someprog" to test out a new version of
 426    the loader.  We need to make sure that it is out of the way of the program
 427    that it will "exec", and that there is sufficient room for the brk.  */
 428
 429 #ifndef ELF_ET_DYN_BASE
 430 #define ELF_ET_DYN_BASE         (TASK_SIZE / 3 * 2)
 431 #endif
 432
 433 #define ARCH_DLINFO                                                     \
 434 do {                                                                    \
 435         NEW_AUX_ENT(AT_SYSINFO_EHDR,                                    \
 436                     (unsigned long)current->mm->context.vdso);          \
 437 } while (0)
 438
 439 #define ARCH_HAS_SETUP_ADDITIONAL_PAGES 1
 440 struct linux_binprm;
 441 extern int arch_setup_additional_pages(struct linux_binprm *bprm,
 442                                        int uses_interp);
 443
 444 struct arch_elf_state {
 445         int nan_2008;
 446         int fp_abi;
 447         int interp_fp_abi;
 448         int overall_fp_mode;
 449 };
 450
 451 #define MIPS_ABI_FP_UNKNOWN     (-1)    /* Unknown FP ABI (kernel internal) */
 452
 453 #define INIT_ARCH_ELF_STATE {                   \
 454         .nan_2008 = -1,                         \
 455         .fp_abi = MIPS_ABI_FP_UNKNOWN,          \
 456         .interp_fp_abi = MIPS_ABI_FP_UNKNOWN,   \
 457         .overall_fp_mode = -1,                  \
 458 }
 459
 460 /* Whether to accept legacy-NaN and 2008-NaN user binaries.  */
 461 extern bool mips_use_nan_legacy;
 462 extern bool mips_use_nan_2008;
 463
 464 extern int arch_elf_pt_proc(void *ehdr, void *phdr, struct file *elf,
 465                             bool is_interp, struct arch_elf_state *state);
 466
 467 extern int arch_check_elf(void *ehdr, bool has_interpreter, void *interp_ehdr,
 468                           struct arch_elf_state *state);
 469
 470 extern void mips_set_personality_nan(struct arch_elf_state *state);
 471 extern void mips_set_personality_fp(struct arch_elf_state *state);
 472
 473 #endif /* _ASM_ELF_H */