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/* ELF register definitions */
 205#define ELF_NGREG       45
 206#define ELF_NFPREG      33
 207
 208typedef unsigned long elf_greg_t;
 209typedef elf_greg_t elf_gregset_t[ELF_NGREG];
 210
 211typedef double elf_fpreg_t;
 212typedef elf_fpreg_t elf_fpregset_t[ELF_NFPREG];
 213
 214void mips_dump_regs32(u32 *uregs, const struct pt_regs *regs);
 215void mips_dump_regs64(u64 *uregs, const struct pt_regs *regs);
 216
 217#ifdef CONFIG_32BIT
 218/*
 219 * This is used to ensure we don't load something for the wrong architecture.
 220 */
 221#define elf_check_arch elf32_check_arch
 222
 223/*
 224 * These are used to set parameters in the core dumps.
 225 */
 226#define ELF_CLASS       ELFCLASS32
 227
 228#define ELF_CORE_COPY_REGS(dest, regs) \
 229        mips_dump_regs32((u32 *)&(dest), (regs));
 230
 231#endif /* CONFIG_32BIT */
 232
 233#ifdef CONFIG_64BIT
 234/*
 235 * This is used to ensure we don't load something for the wrong architecture.
 236 */
 237#define elf_check_arch elf64_check_arch
 238#define compat_elf_check_arch elf32_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/*
 261 * In order to be sure that we don't attempt to execute an O32 binary which
 262 * requires 64 bit FP (FR=1) on a system which does not support it we refuse
 263 * to execute any binary which has bits specified by the following macro set
 264 * in its ELF header flags.
 265 */
 266#ifdef CONFIG_MIPS_O32_FP64_SUPPORT
 267# define __MIPS_O32_FP64_MUST_BE_ZERO   0
 268#else
 269# define __MIPS_O32_FP64_MUST_BE_ZERO   EF_MIPS_FP64
 270#endif
 271
 272#define mips_elf_check_machine(x) ((x)->e_machine == EM_MIPS)
 273
 274#define vmcore_elf32_check_arch mips_elf_check_machine
 275#define vmcore_elf64_check_arch mips_elf_check_machine
 276
 277/*
 278 * Return non-zero if HDR identifies an o32 or n32 ELF binary.
 279 */
 280#define elf32_check_arch(hdr)                                           \
 281({                                                                      \
 282        int __res = 1;                                                  \
 283        struct elfhdr *__h = (hdr);                                     \
 284                                                                        \
 285        if (!mips_elf_check_machine(__h))                               \
 286                __res = 0;                                              \
 287        if (__h->e_ident[EI_CLASS] != ELFCLASS32)                       \
 288                __res = 0;                                              \
 289        if ((__h->e_flags & EF_MIPS_ABI2) != 0) {                       \
 290                if (!IS_ENABLED(CONFIG_MIPS32_N32) ||                   \
 291                     (__h->e_flags & EF_MIPS_ABI))                      \
 292                        __res = 0;                                      \
 293        } else {                                                        \
 294                if (IS_ENABLED(CONFIG_64BIT) && !IS_ENABLED(CONFIG_MIPS32_O32)) \
 295                        __res = 0;                                      \
 296                if (((__h->e_flags & EF_MIPS_ABI) != 0) &&              \
 297                    ((__h->e_flags & EF_MIPS_ABI) != EF_MIPS_ABI_O32))  \
 298                        __res = 0;                                      \
 299                if (__h->e_flags & __MIPS_O32_FP64_MUST_BE_ZERO)        \
 300                        __res = 0;                                      \
 301        }                                                               \
 302        __res;                                                          \
 303})
 304
 305/*
 306 * Return non-zero if HDR identifies an n64 ELF binary.
 307 */
 308#define elf64_check_arch(hdr)                                           \
 309({                                                                      \
 310        int __res = 1;                                                  \
 311        struct elfhdr *__h = (hdr);                                     \
 312                                                                        \
 313        if (!mips_elf_check_machine(__h))                               \
 314                __res = 0;                                              \
 315        if (__h->e_ident[EI_CLASS] != ELFCLASS64)                       \
 316                __res = 0;                                              \
 317                                                                        \
 318        __res;                                                          \
 319})
 320
 321struct mips_abi;
 322
 323extern struct mips_abi mips_abi;
 324extern struct mips_abi mips_abi_32;
 325extern struct mips_abi mips_abi_n32;
 326
 327#ifdef CONFIG_32BIT
 328
 329#define SET_PERSONALITY2(ex, state)                                     \
 330do {                                                                    \
 331        clear_thread_flag(TIF_HYBRID_FPREGS);                           \
 332        set_thread_flag(TIF_32BIT_FPREGS);                              \
 333                                                                        \
 334        current->thread.abi = &mips_abi;                                \
 335                                                                        \
 336        mips_set_personality_fp(state);                                 \
 337        mips_set_personality_nan(state);                                \
 338                                                                        \
 339        if (personality(current->personality) != PER_LINUX)             \
 340                set_personality(PER_LINUX);                             \
 341} while (0)
 342
 343#endif /* CONFIG_32BIT */
 344
 345#ifdef CONFIG_64BIT
 346
 347#ifdef CONFIG_MIPS32_N32
 348#define __SET_PERSONALITY32_N32()                                       \
 349        do {                                                            \
 350                set_thread_flag(TIF_32BIT_ADDR);                        \
 351                                                                        \
 352                current->thread.abi = &mips_abi_n32;                    \
 353        } while (0)
 354#else
 355#define __SET_PERSONALITY32_N32()                                       \
 356        do { } while (0)
 357#endif
 358
 359#ifdef CONFIG_MIPS32_O32
 360#define __SET_PERSONALITY32_O32(ex, state)                              \
 361        do {                                                            \
 362                set_thread_flag(TIF_32BIT_REGS);                        \
 363                set_thread_flag(TIF_32BIT_ADDR);                        \
 364                clear_thread_flag(TIF_HYBRID_FPREGS);                   \
 365                set_thread_flag(TIF_32BIT_FPREGS);                      \
 366                                                                        \
 367                current->thread.abi = &mips_abi_32;                     \
 368                                                                        \
 369                mips_set_personality_fp(state);                         \
 370        } while (0)
 371#else
 372#define __SET_PERSONALITY32_O32(ex, state)                              \
 373        do { } while (0)
 374#endif
 375
 376#ifdef CONFIG_MIPS32_COMPAT
 377#define __SET_PERSONALITY32(ex, state)                                  \
 378do {                                                                    \
 379        if ((((ex).e_flags & EF_MIPS_ABI2) != 0) &&                     \
 380             ((ex).e_flags & EF_MIPS_ABI) == 0)                         \
 381                __SET_PERSONALITY32_N32();                              \
 382        else                                                            \
 383                __SET_PERSONALITY32_O32(ex, state);                     \
 384} while (0)
 385#else
 386#define __SET_PERSONALITY32(ex, state) do { } while (0)
 387#endif
 388
 389#define SET_PERSONALITY2(ex, state)                                     \
 390do {                                                                    \
 391        unsigned int p;                                                 \
 392                                                                        \
 393        clear_thread_flag(TIF_32BIT_REGS);                              \
 394        clear_thread_flag(TIF_32BIT_FPREGS);                            \
 395        clear_thread_flag(TIF_HYBRID_FPREGS);                           \
 396        clear_thread_flag(TIF_32BIT_ADDR);                              \
 397        current->personality &= ~READ_IMPLIES_EXEC;                     \
 398                                                                        \
 399        if ((ex).e_ident[EI_CLASS] == ELFCLASS32)                       \
 400                __SET_PERSONALITY32(ex, state);                         \
 401        else                                                            \
 402                current->thread.abi = &mips_abi;                        \
 403                                                                        \
 404        mips_set_personality_nan(state);                                \
 405                                                                        \
 406        p = personality(current->personality);                          \
 407        if (p != PER_LINUX32 && p != PER_LINUX)                         \
 408                set_personality(PER_LINUX);                             \
 409} while (0)
 410
 411#endif /* CONFIG_64BIT */
 412
 413#define CORE_DUMP_USE_REGSET
 414#define ELF_EXEC_PAGESIZE       PAGE_SIZE
 415
 416/* This yields a mask that user programs can use to figure out what
 417   instruction set this cpu supports.  This could be done in userspace,
 418   but it's not easy, and we've already done it here.  */
 419
 420#define ELF_HWCAP       (elf_hwcap)
 421extern unsigned int elf_hwcap;
 422#include <asm/hwcap.h>
 423
 424/*
 425 * This yields a string that ld.so will use to load implementation
 426 * specific libraries for optimization.  This is more specific in
 427 * intent than poking at uname or /proc/cpuinfo.
 428 */
 429
 430#define ELF_PLATFORM  __elf_platform
 431extern const char *__elf_platform;
 432
 433#define ELF_BASE_PLATFORM  __elf_base_platform
 434extern const char *__elf_base_platform;
 435
 436/*
 437 * See comments in asm-alpha/elf.h, this is the same thing
 438 * on the MIPS.
 439 */
 440#define ELF_PLAT_INIT(_r, load_addr)    do { \
 441        _r->regs[1] = _r->regs[2] = _r->regs[3] = _r->regs[4] = 0;      \
 442        _r->regs[5] = _r->regs[6] = _r->regs[7] = _r->regs[8] = 0;      \
 443        _r->regs[9] = _r->regs[10] = _r->regs[11] = _r->regs[12] = 0;   \
 444        _r->regs[13] = _r->regs[14] = _r->regs[15] = _r->regs[16] = 0;  \
 445        _r->regs[17] = _r->regs[18] = _r->regs[19] = _r->regs[20] = 0;  \
 446        _r->regs[21] = _r->regs[22] = _r->regs[23] = _r->regs[24] = 0;  \
 447        _r->regs[25] = _r->regs[26] = _r->regs[27] = _r->regs[28] = 0;  \
 448        _r->regs[30] = _r->regs[31] = 0;                                \
 449} while (0)
 450
 451/* This is the location that an ET_DYN program is loaded if exec'ed.  Typical
 452   use of this is to invoke "./ld.so someprog" to test out a new version of
 453   the loader.  We need to make sure that it is out of the way of the program
 454   that it will "exec", and that there is sufficient room for the brk.  */
 455
 456#define ELF_ET_DYN_BASE         (TASK_SIZE / 3 * 2)
 457
 458/* update AT_VECTOR_SIZE_ARCH if the number of NEW_AUX_ENT entries changes */
 459#define ARCH_DLINFO                                                     \
 460do {                                                                    \
 461        NEW_AUX_ENT(AT_SYSINFO_EHDR,                                    \
 462                    (unsigned long)current->mm->context.vdso);          \
 463} while (0)
 464
 465#define ARCH_HAS_SETUP_ADDITIONAL_PAGES 1
 466struct linux_binprm;
 467extern int arch_setup_additional_pages(struct linux_binprm *bprm,
 468                                       int uses_interp);
 469
 470#ifdef CONFIG_MIPS_FP_SUPPORT
 471
 472struct arch_elf_state {
 473        int nan_2008;
 474        int fp_abi;
 475        int interp_fp_abi;
 476        int overall_fp_mode;
 477};
 478
 479#define MIPS_ABI_FP_UNKNOWN     (-1)    /* Unknown FP ABI (kernel internal) */
 480
 481#define INIT_ARCH_ELF_STATE {                   \
 482        .nan_2008 = -1,                         \
 483        .fp_abi = MIPS_ABI_FP_UNKNOWN,          \
 484        .interp_fp_abi = MIPS_ABI_FP_UNKNOWN,   \
 485        .overall_fp_mode = -1,                  \
 486}
 487
 488extern int arch_elf_pt_proc(void *ehdr, void *phdr, struct file *elf,
 489                            bool is_interp, struct arch_elf_state *state);
 490
 491extern int arch_check_elf(void *ehdr, bool has_interpreter, void *interp_ehdr,
 492                          struct arch_elf_state *state);
 493
 494/* Whether to accept legacy-NaN and 2008-NaN user binaries.  */
 495extern bool mips_use_nan_legacy;
 496extern bool mips_use_nan_2008;
 497
 498extern void mips_set_personality_nan(struct arch_elf_state *state);
 499extern void mips_set_personality_fp(struct arch_elf_state *state);
 500
 501#else /* !CONFIG_MIPS_FP_SUPPORT */
 502
 503struct arch_elf_state;
 504
 505static inline void mips_set_personality_nan(struct arch_elf_state *state)
 506{
 507        /* no-op */
 508}
 509
 510static inline void mips_set_personality_fp(struct arch_elf_state *state)
 511{
 512        /* no-op */
 513}
 514
 515#endif /* !CONFIG_MIPS_FP_SUPPORT */
 516
 517#define elf_read_implies_exec(ex, stk) mips_elf_read_implies_exec(&(ex), stk)
 518extern int mips_elf_read_implies_exec(void *elf_ex, int exstack);
 519
 520#endif /* _ASM_ELF_H */
 521