LXR linux/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 <linux/mm_types.h>
  14
  15#include <uapi/linux/elf.h>
  16
  17#include <asm/current.h>
  18
  19/* ELF header e_flags defines. */
  20/* MIPS architecture level. */
  21#define EF_MIPS_ARCH_1          0x00000000      /* -mips1 code.  */
  22#define EF_MIPS_ARCH_2          0x10000000      /* -mips2 code.  */
  23#define EF_MIPS_ARCH_3          0x20000000      /* -mips3 code.  */
  24#define EF_MIPS_ARCH_4          0x30000000      /* -mips4 code.  */
  25#define EF_MIPS_ARCH_5          0x40000000      /* -mips5 code.  */
  26#define EF_MIPS_ARCH_32         0x50000000      /* MIPS32 code.  */
  27#define EF_MIPS_ARCH_64         0x60000000      /* MIPS64 code.  */
  28#define EF_MIPS_ARCH_32R2       0x70000000      /* MIPS32 R2 code.  */
  29#define EF_MIPS_ARCH_64R2       0x80000000      /* MIPS64 R2 code.  */
  30
  31/* The ABI of a file. */
  32#define EF_MIPS_ABI_O32         0x00001000      /* O32 ABI.  */
  33#define EF_MIPS_ABI_O64         0x00002000      /* O32 extended for 64 bit.  */
  34
  35#define PT_MIPS_REGINFO         0x70000000
  36#define PT_MIPS_RTPROC          0x70000001
  37#define PT_MIPS_OPTIONS         0x70000002
  38#define PT_MIPS_ABIFLAGS        0x70000003
  39
  40/* Flags in the e_flags field of the header */
  41#define EF_MIPS_NOREORDER       0x00000001
  42#define EF_MIPS_PIC             0x00000002
  43#define EF_MIPS_CPIC            0x00000004
  44#define EF_MIPS_ABI2            0x00000020
  45#define EF_MIPS_OPTIONS_FIRST   0x00000080
  46#define EF_MIPS_32BITMODE       0x00000100
  47#define EF_MIPS_FP64            0x00000200
  48#define EF_MIPS_NAN2008         0x00000400
  49#define EF_MIPS_ABI             0x0000f000
  50#define EF_MIPS_ARCH            0xf0000000
  51
  52#define DT_MIPS_RLD_VERSION     0x70000001
  53#define DT_MIPS_TIME_STAMP      0x70000002
  54#define DT_MIPS_ICHECKSUM       0x70000003
  55#define DT_MIPS_IVERSION        0x70000004
  56#define DT_MIPS_FLAGS           0x70000005
  57        #define RHF_NONE        0x00000000
  58        #define RHF_HARDWAY     0x00000001
  59        #define RHF_NOTPOT      0x00000002
  60        #define RHF_SGI_ONLY    0x00000010
  61#define DT_MIPS_BASE_ADDRESS    0x70000006
  62#define DT_MIPS_CONFLICT        0x70000008
  63#define DT_MIPS_LIBLIST         0x70000009
  64#define DT_MIPS_LOCAL_GOTNO     0x7000000a
  65#define DT_MIPS_CONFLICTNO      0x7000000b
  66#define DT_MIPS_LIBLISTNO       0x70000010
  67#define DT_MIPS_SYMTABNO        0x70000011
  68#define DT_MIPS_UNREFEXTNO      0x70000012
  69#define DT_MIPS_GOTSYM          0x70000013
  70#define DT_MIPS_HIPAGENO        0x70000014
  71#define DT_MIPS_RLD_MAP         0x70000016
  72
  73#define R_MIPS_NONE             0
  74#define R_MIPS_16               1
  75#define R_MIPS_32               2
  76#define R_MIPS_REL32            3
  77#define R_MIPS_26               4
  78#define R_MIPS_HI16             5
  79#define R_MIPS_LO16             6
  80#define R_MIPS_GPREL16          7
  81#define R_MIPS_LITERAL          8
  82#define R_MIPS_GOT16            9
  83#define R_MIPS_PC16             10
  84#define R_MIPS_CALL16           11
  85#define R_MIPS_GPREL32          12
  86/* The remaining relocs are defined on Irix, although they are not
  87   in the MIPS ELF ABI.  */
  88#define R_MIPS_UNUSED1          13
  89#define R_MIPS_UNUSED2          14
  90#define R_MIPS_UNUSED3          15
  91#define R_MIPS_SHIFT5           16
  92#define R_MIPS_SHIFT6           17
  93#define R_MIPS_64               18
  94#define R_MIPS_GOT_DISP         19
  95#define R_MIPS_GOT_PAGE         20
  96#define R_MIPS_GOT_OFST         21
  97/*
  98 * The following two relocation types are specified in the MIPS ABI
  99 * conformance guide version 1.2 but not yet in the psABI.
 100 */
 101#define R_MIPS_GOTHI16          22
 102#define R_MIPS_GOTLO16          23
 103#define R_MIPS_SUB              24
 104#define R_MIPS_INSERT_A         25
 105#define R_MIPS_INSERT_B         26
 106#define R_MIPS_DELETE           27
 107#define R_MIPS_HIGHER           28
 108#define R_MIPS_HIGHEST          29
 109/*
 110 * The following two relocation types are specified in the MIPS ABI
 111 * conformance guide version 1.2 but not yet in the psABI.
 112 */
 113#define R_MIPS_CALLHI16         30
 114#define R_MIPS_CALLLO16         31
 115/*
 116 * Introduced for MIPSr6.
 117 */
 118#define R_MIPS_PC21_S2          60
 119#define R_MIPS_PC26_S2          61
 120/*
 121 * This range is reserved for vendor specific relocations.
 122 */
 123#define R_MIPS_LOVENDOR         100
 124#define R_MIPS_HIVENDOR         127
 125
 126#define SHN_MIPS_ACCOMON        0xff00          /* Allocated common symbols */
 127#define SHN_MIPS_TEXT           0xff01          /* Allocated test symbols.  */
 128#define SHN_MIPS_DATA           0xff02          /* Allocated data symbols.  */
 129#define SHN_MIPS_SCOMMON        0xff03          /* Small common symbols */
 130#define SHN_MIPS_SUNDEFINED     0xff04          /* Small undefined symbols */
 131
 132#define SHT_MIPS_LIST           0x70000000
 133#define SHT_MIPS_CONFLICT       0x70000002
 134#define SHT_MIPS_GPTAB          0x70000003
 135#define SHT_MIPS_UCODE          0x70000004
 136#define SHT_MIPS_DEBUG          0x70000005
 137#define SHT_MIPS_REGINFO        0x70000006
 138#define SHT_MIPS_PACKAGE        0x70000007
 139#define SHT_MIPS_PACKSYM        0x70000008
 140#define SHT_MIPS_RELD           0x70000009
 141#define SHT_MIPS_IFACE          0x7000000b
 142#define SHT_MIPS_CONTENT        0x7000000c
 143#define SHT_MIPS_OPTIONS        0x7000000d
 144#define SHT_MIPS_SHDR           0x70000010
 145#define SHT_MIPS_FDESC          0x70000011
 146#define SHT_MIPS_EXTSYM         0x70000012
 147#define SHT_MIPS_DENSE          0x70000013
 148#define SHT_MIPS_PDESC          0x70000014
 149#define SHT_MIPS_LOCSYM         0x70000015
 150#define SHT_MIPS_AUXSYM         0x70000016
 151#define SHT_MIPS_OPTSYM         0x70000017
 152#define SHT_MIPS_LOCSTR         0x70000018
 153#define SHT_MIPS_LINE           0x70000019
 154#define SHT_MIPS_RFDESC         0x7000001a
 155#define SHT_MIPS_DELTASYM       0x7000001b
 156#define SHT_MIPS_DELTAINST      0x7000001c
 157#define SHT_MIPS_DELTACLASS     0x7000001d
 158#define SHT_MIPS_DWARF          0x7000001e
 159#define SHT_MIPS_DELTADECL      0x7000001f
 160#define SHT_MIPS_SYMBOL_LIB     0x70000020
 161#define SHT_MIPS_EVENTS         0x70000021
 162#define SHT_MIPS_TRANSLATE      0x70000022
 163#define SHT_MIPS_PIXIE          0x70000023
 164#define SHT_MIPS_XLATE          0x70000024
 165#define SHT_MIPS_XLATE_DEBUG    0x70000025
 166#define SHT_MIPS_WHIRL          0x70000026
 167#define SHT_MIPS_EH_REGION      0x70000027
 168#define SHT_MIPS_XLATE_OLD      0x70000028
 169#define SHT_MIPS_PDR_EXCEPTION  0x70000029
 170
 171#define SHF_MIPS_GPREL          0x10000000
 172#define SHF_MIPS_MERGE          0x20000000
 173#define SHF_MIPS_ADDR           0x40000000
 174#define SHF_MIPS_STRING         0x80000000
 175#define SHF_MIPS_NOSTRIP        0x08000000
 176#define SHF_MIPS_LOCAL          0x04000000
 177#define SHF_MIPS_NAMES          0x02000000
 178#define SHF_MIPS_NODUPES        0x01000000
 179
 180#define MIPS_ABI_FP_ANY         0       /* FP ABI doesn't matter */
 181#define MIPS_ABI_FP_DOUBLE      1       /* -mdouble-float */
 182#define MIPS_ABI_FP_SINGLE      2       /* -msingle-float */
 183#define MIPS_ABI_FP_SOFT        3       /* -msoft-float */
 184#define MIPS_ABI_FP_OLD_64      4       /* -mips32r2 -mfp64 */
 185#define MIPS_ABI_FP_XX          5       /* -mfpxx */
 186#define MIPS_ABI_FP_64          6       /* -mips32r2 -mfp64 */
 187#define MIPS_ABI_FP_64A         7       /* -mips32r2 -mfp64 -mno-odd-spreg */
 188
 189struct 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#ifndef ELF_ARCH
 205/* ELF register definitions */
 206#define ELF_NGREG       45
 207#define ELF_NFPREG      33
 208
 209typedef unsigned long elf_greg_t;
 210typedef elf_greg_t elf_gregset_t[ELF_NGREG];
 211
 212typedef double elf_fpreg_t;
 213typedef elf_fpreg_t elf_fpregset_t[ELF_NFPREG];
 214
 215void mips_dump_regs32(u32 *uregs, const struct pt_regs *regs);
 216void mips_dump_regs64(u64 *uregs, const struct pt_regs *regs);
 217
 218#ifdef CONFIG_32BIT
 219/*
 220 * This is used to ensure we don't load something for the wrong architecture.
 221 */
 222#define elf_check_arch elfo32_check_arch
 223
 224/*
 225 * These are used to set parameters in the core dumps.
 226 */
 227#define ELF_CLASS       ELFCLASS32
 228
 229#define ELF_CORE_COPY_REGS(dest, regs) \
 230        mips_dump_regs32((u32 *)&(dest), (regs));
 231
 232#endif /* CONFIG_32BIT */
 233
 234#ifdef CONFIG_64BIT
 235/*
 236 * This is used to ensure we don't load something for the wrong architecture.
 237 */
 238#define elf_check_arch elfn64_check_arch
 239
 240/*
 241 * These are used to set parameters in the core dumps.
 242 */
 243#define ELF_CLASS       ELFCLASS64
 244
 245#define ELF_CORE_COPY_REGS(dest, regs) \
 246        mips_dump_regs64((u64 *)&(dest), (regs));
 247
 248#endif /* CONFIG_64BIT */
 249
 250/*
 251 * These are used to set parameters in the core dumps.
 252 */
 253#ifdef __MIPSEB__
 254#define ELF_DATA        ELFDATA2MSB
 255#elif defined(__MIPSEL__)
 256#define ELF_DATA        ELFDATA2LSB
 257#endif
 258#define ELF_ARCH        EM_MIPS
 259
 260#endif /* !defined(ELF_ARCH) */
 261
 262/*
 263 * In order to be sure that we don't attempt to execute an O32 binary which
 264 * requires 64 bit FP (FR=1) on a system which does not support it we refuse
 265 * to execute any binary which has bits specified by the following macro set
 266 * in its ELF header flags.
 267 */
 268#ifdef CONFIG_MIPS_O32_FP64_SUPPORT
 269# define __MIPS_O32_FP64_MUST_BE_ZERO   0
 270#else
 271# define __MIPS_O32_FP64_MUST_BE_ZERO   EF_MIPS_FP64
 272#endif
 273
 274#define mips_elf_check_machine(x) ((x)->e_machine == EM_MIPS)
 275
 276#define vmcore_elf32_check_arch mips_elf_check_machine
 277#define vmcore_elf64_check_arch mips_elf_check_machine
 278
 279/*
 280 * Return non-zero if HDR identifies an o32 ELF binary.
 281 */
 282#define elfo32_check_arch(hdr)                                          \
 283({                                                                      \
 284        int __res = 1;                                                  \
 285        struct elfhdr *__h = (hdr);                                     \
 286                                                                        \
 287        if (!mips_elf_check_machine(__h))                               \
 288                __res = 0;                                              \
 289        if (__h->e_ident[EI_CLASS] != ELFCLASS32)                       \
 290                __res = 0;                                              \
 291        if ((__h->e_flags & EF_MIPS_ABI2) != 0)                         \
 292                __res = 0;                                              \
 293        if (((__h->e_flags & EF_MIPS_ABI) != 0) &&                      \
 294            ((__h->e_flags & EF_MIPS_ABI) != EF_MIPS_ABI_O32))          \
 295                __res = 0;                                              \
 296        if (__h->e_flags & __MIPS_O32_FP64_MUST_BE_ZERO)                \
 297                __res = 0;                                              \
 298                                                                        \
 299        __res;                                                          \
 300})
 301
 302/*
 303 * Return non-zero if HDR identifies an n64 ELF binary.
 304 */
 305#define elfn64_check_arch(hdr)                                          \
 306({                                                                      \
 307        int __res = 1;                                                  \
 308        struct elfhdr *__h = (hdr);                                     \
 309                                                                        \
 310        if (!mips_elf_check_machine(__h))                               \
 311                __res = 0;                                              \
 312        if (__h->e_ident[EI_CLASS] != ELFCLASS64)                       \
 313                __res = 0;                                              \
 314                                                                        \
 315        __res;                                                          \
 316})
 317
 318/*
 319 * Return non-zero if HDR identifies an n32 ELF binary.
 320 */
 321#define elfn32_check_arch(hdr)                                          \
 322({                                                                      \
 323        int __res = 1;                                                  \
 324        struct elfhdr *__h = (hdr);                                     \
 325                                                                        \
 326        if (!mips_elf_check_machine(__h))                               \
 327                __res = 0;                                              \
 328        if (__h->e_ident[EI_CLASS] != ELFCLASS32)                       \
 329                __res = 0;                                              \
 330        if (((__h->e_flags & EF_MIPS_ABI2) == 0) ||                     \
 331            ((__h->e_flags & EF_MIPS_ABI) != 0))                        \
 332                __res = 0;                                              \
 333                                                                        \
 334        __res;                                                          \
 335})
 336
 337struct mips_abi;
 338
 339extern struct mips_abi mips_abi;
 340extern struct mips_abi mips_abi_32;
 341extern struct mips_abi mips_abi_n32;
 342
 343#ifdef CONFIG_32BIT
 344
 345#define SET_PERSONALITY2(ex, state)                                     \
 346do {                                                                    \
 347        clear_thread_flag(TIF_HYBRID_FPREGS);                           \
 348        set_thread_flag(TIF_32BIT_FPREGS);                              \
 349                                                                        \
 350        current->thread.abi = &mips_abi;                                \
 351                                                                        \
 352        mips_set_personality_fp(state);                                 \
 353        mips_set_personality_nan(state);                                \
 354                                                                        \
 355        if (personality(current->personality) != PER_LINUX)             \
 356                set_personality(PER_LINUX);                             \
 357} while (0)
 358
 359#endif /* CONFIG_32BIT */
 360
 361#ifdef CONFIG_64BIT
 362
 363#ifdef CONFIG_MIPS32_N32
 364#define __SET_PERSONALITY32_N32()                                       \
 365        do {                                                            \
 366                set_thread_flag(TIF_32BIT_ADDR);                        \
 367                                                                        \
 368                current->thread.abi = &mips_abi_n32;                    \
 369        } while (0)
 370#else
 371#define __SET_PERSONALITY32_N32()                                       \
 372        do { } while (0)
 373#endif
 374
 375#ifdef CONFIG_MIPS32_O32
 376#define __SET_PERSONALITY32_O32(ex, state)                              \
 377        do {                                                            \
 378                set_thread_flag(TIF_32BIT_REGS);                        \
 379                set_thread_flag(TIF_32BIT_ADDR);                        \
 380                clear_thread_flag(TIF_HYBRID_FPREGS);                   \
 381                set_thread_flag(TIF_32BIT_FPREGS);                      \
 382                                                                        \
 383                current->thread.abi = &mips_abi_32;                     \
 384                                                                        \
 385                mips_set_personality_fp(state);                         \
 386        } while (0)
 387#else
 388#define __SET_PERSONALITY32_O32(ex, state)                              \
 389        do { } while (0)
 390#endif
 391
 392#ifdef CONFIG_MIPS32_COMPAT
 393#define __SET_PERSONALITY32(ex, state)                                  \
 394do {                                                                    \
 395        if ((((ex).e_flags & EF_MIPS_ABI2) != 0) &&                     \
 396             ((ex).e_flags & EF_MIPS_ABI) == 0)                         \
 397                __SET_PERSONALITY32_N32();                              \
 398        else                                                            \
 399                __SET_PERSONALITY32_O32(ex, state);                     \
 400} while (0)
 401#else
 402#define __SET_PERSONALITY32(ex, state) do { } while (0)
 403#endif
 404
 405#define SET_PERSONALITY2(ex, state)                                     \
 406do {                                                                    \
 407        unsigned int p;                                                 \
 408                                                                        \
 409        clear_thread_flag(TIF_32BIT_REGS);                              \
 410        clear_thread_flag(TIF_32BIT_FPREGS);                            \
 411        clear_thread_flag(TIF_HYBRID_FPREGS);                           \
 412        clear_thread_flag(TIF_32BIT_ADDR);                              \
 413                                                                        \
 414        if ((ex).e_ident[EI_CLASS] == ELFCLASS32)                       \
 415                __SET_PERSONALITY32(ex, state);                         \
 416        else                                                            \
 417                current->thread.abi = &mips_abi;                        \
 418                                                                        \
 419        mips_set_personality_nan(state);                                \
 420                                                                        \
 421        p = personality(current->personality);                          \
 422        if (p != PER_LINUX32 && p != PER_LINUX)                         \
 423                set_personality(PER_LINUX);                             \
 424} while (0)
 425
 426#endif /* CONFIG_64BIT */
 427
 428#define CORE_DUMP_USE_REGSET
 429#define ELF_EXEC_PAGESIZE       PAGE_SIZE
 430
 431/* This yields a mask that user programs can use to figure out what
 432   instruction set this cpu supports.  This could be done in userspace,
 433   but it's not easy, and we've already done it here.  */
 434
 435#define ELF_HWCAP       (elf_hwcap)
 436extern unsigned int elf_hwcap;
 437#include <asm/hwcap.h>
 438
 439/*
 440 * This yields a string that ld.so will use to load implementation
 441 * specific libraries for optimization.  This is more specific in
 442 * intent than poking at uname or /proc/cpuinfo.
 443 */
 444
 445#define ELF_PLATFORM  __elf_platform
 446extern const char *__elf_platform;
 447
 448/*
 449 * See comments in asm-alpha/elf.h, this is the same thing
 450 * on the MIPS.
 451 */
 452#define ELF_PLAT_INIT(_r, load_addr)    do { \
 453        _r->regs[1] = _r->regs[2] = _r->regs[3] = _r->regs[4] = 0;      \
 454        _r->regs[5] = _r->regs[6] = _r->regs[7] = _r->regs[8] = 0;      \
 455        _r->regs[9] = _r->regs[10] = _r->regs[11] = _r->regs[12] = 0;   \
 456        _r->regs[13] = _r->regs[14] = _r->regs[15] = _r->regs[16] = 0;  \
 457        _r->regs[17] = _r->regs[18] = _r->regs[19] = _r->regs[20] = 0;  \
 458        _r->regs[21] = _r->regs[22] = _r->regs[23] = _r->regs[24] = 0;  \
 459        _r->regs[25] = _r->regs[26] = _r->regs[27] = _r->regs[28] = 0;  \
 460        _r->regs[30] = _r->regs[31] = 0;                                \
 461} while (0)
 462
 463/* This is the location that an ET_DYN program is loaded if exec'ed.  Typical
 464   use of this is to invoke "./ld.so someprog" to test out a new version of
 465   the loader.  We need to make sure that it is out of the way of the program
 466   that it will "exec", and that there is sufficient room for the brk.  */
 467
 468#ifndef ELF_ET_DYN_BASE
 469#define ELF_ET_DYN_BASE         (TASK_SIZE / 3 * 2)
 470#endif
 471
 472/* update AT_VECTOR_SIZE_ARCH if the number of NEW_AUX_ENT entries changes */
 473#define ARCH_DLINFO                                                     \
 474do {                                                                    \
 475        NEW_AUX_ENT(AT_SYSINFO_EHDR,                                    \
 476                    (unsigned long)current->mm->context.vdso);          \
 477} while (0)
 478
 479#define ARCH_HAS_SETUP_ADDITIONAL_PAGES 1
 480struct linux_binprm;
 481extern int arch_setup_additional_pages(struct linux_binprm *bprm,
 482                                       int uses_interp);
 483
 484struct arch_elf_state {
 485        int nan_2008;
 486        int fp_abi;
 487        int interp_fp_abi;
 488        int overall_fp_mode;
 489};
 490
 491#define MIPS_ABI_FP_UNKNOWN     (-1)    /* Unknown FP ABI (kernel internal) */
 492
 493#define INIT_ARCH_ELF_STATE {                   \
 494        .nan_2008 = -1,                         \
 495        .fp_abi = MIPS_ABI_FP_UNKNOWN,          \
 496        .interp_fp_abi = MIPS_ABI_FP_UNKNOWN,   \
 497        .overall_fp_mode = -1,                  \
 498}
 499
 500/* Whether to accept legacy-NaN and 2008-NaN user binaries.  */
 501extern bool mips_use_nan_legacy;
 502extern bool mips_use_nan_2008;
 503
 504extern int arch_elf_pt_proc(void *ehdr, void *phdr, struct file *elf,
 505                            bool is_interp, struct arch_elf_state *state);
 506
 507extern int arch_check_elf(void *ehdr, bool has_interpreter, void *interp_ehdr,
 508                          struct arch_elf_state *state);
 509
 510extern void mips_set_personality_nan(struct arch_elf_state *state);
 511extern void mips_set_personality_fp(struct arch_elf_state *state);
 512
 513#define elf_read_implies_exec(ex, stk) mips_elf_read_implies_exec(&(ex), stk)
 514extern int mips_elf_read_implies_exec(void *elf_ex, int exstack);
 515
 516#endif /* _ASM_ELF_H */
 517