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/fs.h>
  12 #include <uapi/linux/elf.h>
  13
  14 #include <asm/cpu-info.h>
  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_ABI             0x0000f000
  47 #define EF_MIPS_ARCH            0xf0000000
  48
  49 #define DT_MIPS_RLD_VERSION     0x70000001
  50 #define DT_MIPS_TIME_STAMP      0x70000002
  51 #define DT_MIPS_ICHECKSUM       0x70000003
  52 #define DT_MIPS_IVERSION        0x70000004
  53 #define DT_MIPS_FLAGS           0x70000005
  54         #define RHF_NONE        0x00000000
  55         #define RHF_HARDWAY     0x00000001
  56         #define RHF_NOTPOT      0x00000002
  57         #define RHF_SGI_ONLY    0x00000010
  58 #define DT_MIPS_BASE_ADDRESS    0x70000006
  59 #define DT_MIPS_CONFLICT        0x70000008
  60 #define DT_MIPS_LIBLIST         0x70000009
  61 #define DT_MIPS_LOCAL_GOTNO     0x7000000a
  62 #define DT_MIPS_CONFLICTNO      0x7000000b
  63 #define DT_MIPS_LIBLISTNO       0x70000010
  64 #define DT_MIPS_SYMTABNO        0x70000011
  65 #define DT_MIPS_UNREFEXTNO      0x70000012
  66 #define DT_MIPS_GOTSYM          0x70000013
  67 #define DT_MIPS_HIPAGENO        0x70000014
  68 #define DT_MIPS_RLD_MAP         0x70000016
  69
  70 #define R_MIPS_NONE             0
  71 #define R_MIPS_16               1
  72 #define R_MIPS_32               2
  73 #define R_MIPS_REL32            3
  74 #define R_MIPS_26               4
  75 #define R_MIPS_HI16             5
  76 #define R_MIPS_LO16             6
  77 #define R_MIPS_GPREL16          7
  78 #define R_MIPS_LITERAL          8
  79 #define R_MIPS_GOT16            9
  80 #define R_MIPS_PC16             10
  81 #define R_MIPS_CALL16           11
  82 #define R_MIPS_GPREL32          12
  83 /* The remaining relocs are defined on Irix, although they are not
  84    in the MIPS ELF ABI.  */
  85 #define R_MIPS_UNUSED1          13
  86 #define R_MIPS_UNUSED2          14
  87 #define R_MIPS_UNUSED3          15
  88 #define R_MIPS_SHIFT5           16
  89 #define R_MIPS_SHIFT6           17
  90 #define R_MIPS_64               18
  91 #define R_MIPS_GOT_DISP         19
  92 #define R_MIPS_GOT_PAGE         20
  93 #define R_MIPS_GOT_OFST         21
  94 /*
  95  * The following two relocation types are specified in the MIPS ABI
  96  * conformance guide version 1.2 but not yet in the psABI.
  97  */
  98 #define R_MIPS_GOTHI16          22
  99 #define R_MIPS_GOTLO16          23
 100 #define R_MIPS_SUB              24
 101 #define R_MIPS_INSERT_A         25
 102 #define R_MIPS_INSERT_B         26
 103 #define R_MIPS_DELETE           27
 104 #define R_MIPS_HIGHER           28
 105 #define R_MIPS_HIGHEST          29
 106 /*
 107  * The following two relocation types are specified in the MIPS ABI
 108  * conformance guide version 1.2 but not yet in the psABI.
 109  */
 110 #define R_MIPS_CALLHI16         30
 111 #define R_MIPS_CALLLO16         31
 112 /*
 113  * This range is reserved for vendor specific relocations.
 114  */
 115 #define R_MIPS_LOVENDOR         100
 116 #define R_MIPS_HIVENDOR         127
 117
 118 #define SHN_MIPS_ACCOMON        0xff00          /* Allocated common symbols */
 119 #define SHN_MIPS_TEXT           0xff01          /* Allocated test symbols.  */
 120 #define SHN_MIPS_DATA           0xff02          /* Allocated data symbols.  */
 121 #define SHN_MIPS_SCOMMON        0xff03          /* Small common symbols */
 122 #define SHN_MIPS_SUNDEFINED     0xff04          /* Small undefined symbols */
 123
 124 #define SHT_MIPS_LIST           0x70000000
 125 #define SHT_MIPS_CONFLICT       0x70000002
 126 #define SHT_MIPS_GPTAB          0x70000003
 127 #define SHT_MIPS_UCODE          0x70000004
 128 #define SHT_MIPS_DEBUG          0x70000005
 129 #define SHT_MIPS_REGINFO        0x70000006
 130 #define SHT_MIPS_PACKAGE        0x70000007
 131 #define SHT_MIPS_PACKSYM        0x70000008
 132 #define SHT_MIPS_RELD           0x70000009
 133 #define SHT_MIPS_IFACE          0x7000000b
 134 #define SHT_MIPS_CONTENT        0x7000000c
 135 #define SHT_MIPS_OPTIONS        0x7000000d
 136 #define SHT_MIPS_SHDR           0x70000010
 137 #define SHT_MIPS_FDESC          0x70000011
 138 #define SHT_MIPS_EXTSYM         0x70000012
 139 #define SHT_MIPS_DENSE          0x70000013
 140 #define SHT_MIPS_PDESC          0x70000014
 141 #define SHT_MIPS_LOCSYM         0x70000015
 142 #define SHT_MIPS_AUXSYM         0x70000016
 143 #define SHT_MIPS_OPTSYM         0x70000017
 144 #define SHT_MIPS_LOCSTR         0x70000018
 145 #define SHT_MIPS_LINE           0x70000019
 146 #define SHT_MIPS_RFDESC         0x7000001a
 147 #define SHT_MIPS_DELTASYM       0x7000001b
 148 #define SHT_MIPS_DELTAINST      0x7000001c
 149 #define SHT_MIPS_DELTACLASS     0x7000001d
 150 #define SHT_MIPS_DWARF          0x7000001e
 151 #define SHT_MIPS_DELTADECL      0x7000001f
 152 #define SHT_MIPS_SYMBOL_LIB     0x70000020
 153 #define SHT_MIPS_EVENTS         0x70000021
 154 #define SHT_MIPS_TRANSLATE      0x70000022
 155 #define SHT_MIPS_PIXIE          0x70000023
 156 #define SHT_MIPS_XLATE          0x70000024
 157 #define SHT_MIPS_XLATE_DEBUG    0x70000025
 158 #define SHT_MIPS_WHIRL          0x70000026
 159 #define SHT_MIPS_EH_REGION      0x70000027
 160 #define SHT_MIPS_XLATE_OLD      0x70000028
 161 #define SHT_MIPS_PDR_EXCEPTION  0x70000029
 162
 163 #define SHF_MIPS_GPREL          0x10000000
 164 #define SHF_MIPS_MERGE          0x20000000
 165 #define SHF_MIPS_ADDR           0x40000000
 166 #define SHF_MIPS_STRING         0x80000000
 167 #define SHF_MIPS_NOSTRIP        0x08000000
 168 #define SHF_MIPS_LOCAL          0x04000000
 169 #define SHF_MIPS_NAMES          0x02000000
 170 #define SHF_MIPS_NODUPES        0x01000000
 171
 172 #ifndef ELF_ARCH
 173 /* ELF register definitions */
 174 #define ELF_NGREG       45
 175 #define ELF_NFPREG      33
 176
 177 typedef unsigned long elf_greg_t;
 178 typedef elf_greg_t elf_gregset_t[ELF_NGREG];
 179
 180 typedef double elf_fpreg_t;
 181 typedef elf_fpreg_t elf_fpregset_t[ELF_NFPREG];
 182
 183 struct mips_elf_abiflags_v0 {
 184         uint16_t version;       /* Version of flags structure */
 185         uint8_t isa_level;      /* The level of the ISA: 1-5, 32, 64 */
 186         uint8_t isa_rev;        /* The revision of ISA: 0 for MIPS V and below,
 187                                    1-n otherwise */
 188         uint8_t gpr_size;       /* The size of general purpose registers */
 189         uint8_t cpr1_size;      /* The size of co-processor 1 registers */
 190         uint8_t cpr2_size;      /* The size of co-processor 2 registers */
 191         uint8_t fp_abi;         /* The floating-point ABI */
 192         uint32_t isa_ext;       /* Mask of processor-specific extensions */
 193         uint32_t ases;          /* Mask of ASEs used */
 194         uint32_t flags1;        /* Mask of general flags */
 195         uint32_t flags2;
 196 };
 197
 198 #define MIPS_ABI_FP_ANY         0       /* FP ABI doesn't matter */
 199 #define MIPS_ABI_FP_DOUBLE      1       /* -mdouble-float */
 200 #define MIPS_ABI_FP_SINGLE      2       /* -msingle-float */
 201 #define MIPS_ABI_FP_SOFT        3       /* -msoft-float */
 202 #define MIPS_ABI_FP_OLD_64      4       /* -mips32r2 -mfp64 */
 203 #define MIPS_ABI_FP_XX          5       /* -mfpxx */
 204 #define MIPS_ABI_FP_64          6       /* -mips32r2 -mfp64 */
 205 #define MIPS_ABI_FP_64A         7       /* -mips32r2 -mfp64 -mno-odd-spreg */
 206
 207 #ifdef CONFIG_32BIT
 208
 209 /*
 210  * In order to be sure that we don't attempt to execute an O32 binary which
 211  * requires 64 bit FP (FR=1) on a system which does not support it we refuse
 212  * to execute any binary which has bits specified by the following macro set
 213  * in its ELF header flags.
 214  */
 215 #ifdef CONFIG_MIPS_O32_FP64_SUPPORT
 216 # define __MIPS_O32_FP64_MUST_BE_ZERO   0
 217 #else
 218 # define __MIPS_O32_FP64_MUST_BE_ZERO   EF_MIPS_FP64
 219 #endif
 220
 221 /*
 222  * This is used to ensure we don't load something for the wrong architecture.
 223  */
 224 #define elf_check_arch(hdr)                                             \
 225 ({                                                                      \
 226         int __res = 1;                                                  \
 227         struct elfhdr *__h = (hdr);                                     \
 228                                                                         \
 229         if (__h->e_machine != EM_MIPS)                                  \
 230                 __res = 0;                                              \
 231         if (__h->e_ident[EI_CLASS] != ELFCLASS32)                       \
 232                 __res = 0;                                              \
 233         if ((__h->e_flags & EF_MIPS_ABI2) != 0)                         \
 234                 __res = 0;                                              \
 235         if (((__h->e_flags & EF_MIPS_ABI) != 0) &&                      \
 236             ((__h->e_flags & EF_MIPS_ABI) != EF_MIPS_ABI_O32))          \
 237                 __res = 0;                                              \
 238         if (__h->e_flags & __MIPS_O32_FP64_MUST_BE_ZERO)                \
 239                 __res = 0;                                              \
 240                                                                         \
 241         __res;                                                          \
 242 })
 243
 244 /*
 245  * These are used to set parameters in the core dumps.
 246  */
 247 #define ELF_CLASS       ELFCLASS32
 248
 249 #endif /* CONFIG_32BIT */
 250
 251 #ifdef CONFIG_64BIT
 252 /*
 253  * This is used to ensure we don't load something for the wrong architecture.
 254  */
 255 #define elf_check_arch(hdr)                                             \
 256 ({                                                                      \
 257         int __res = 1;                                                  \
 258         struct elfhdr *__h = (hdr);                                     \
 259                                                                         \
 260         if (__h->e_machine != EM_MIPS)                                  \
 261                 __res = 0;                                              \
 262         if (__h->e_ident[EI_CLASS] != ELFCLASS64)                       \
 263                 __res = 0;                                              \
 264                                                                         \
 265         __res;                                                          \
 266 })
 267
 268 /*
 269  * These are used to set parameters in the core dumps.
 270  */
 271 #define ELF_CLASS       ELFCLASS64
 272
 273 #endif /* CONFIG_64BIT */
 274
 275 /*
 276  * These are used to set parameters in the core dumps.
 277  */
 278 #ifdef __MIPSEB__
 279 #define ELF_DATA        ELFDATA2MSB
 280 #elif defined(__MIPSEL__)
 281 #define ELF_DATA        ELFDATA2LSB
 282 #endif
 283 #define ELF_ARCH        EM_MIPS
 284
 285 #endif /* !defined(ELF_ARCH) */
 286
 287 struct mips_abi;
 288
 289 extern struct mips_abi mips_abi;
 290 extern struct mips_abi mips_abi_32;
 291 extern struct mips_abi mips_abi_n32;
 292
 293 #ifdef CONFIG_32BIT
 294
 295 #define SET_PERSONALITY2(ex, state)                                     \
 296 do {                                                                    \
 297         if (personality(current->personality) != PER_LINUX)             \
 298                 set_personality(PER_LINUX);                             \
 299                                                                         \
 300         clear_thread_flag(TIF_HYBRID_FPREGS);                           \
 301         set_thread_flag(TIF_32BIT_FPREGS);                              \
 302                                                                         \
 303         mips_set_personality_fp(state);                                 \
 304                                                                         \
 305         current->thread.abi = &mips_abi;                                \
 306                                                                         \
 307         current->thread.fpu.fcr31 = boot_cpu_data.fpu_csr31;            \
 308 } while (0)
 309
 310 #endif /* CONFIG_32BIT */
 311
 312 #ifdef CONFIG_64BIT
 313
 314 #ifdef CONFIG_MIPS32_N32
 315 #define __SET_PERSONALITY32_N32()                                       \
 316         do {                                                            \
 317                 set_thread_flag(TIF_32BIT_ADDR);                        \
 318                 current->thread.abi = &mips_abi_n32;                    \
 319         } while (0)
 320 #else
 321 #define __SET_PERSONALITY32_N32()                                       \
 322         do { } while (0)
 323 #endif
 324
 325 #ifdef CONFIG_MIPS32_O32
 326 #define __SET_PERSONALITY32_O32(ex, state)                              \
 327         do {                                                            \
 328                 set_thread_flag(TIF_32BIT_REGS);                        \
 329                 set_thread_flag(TIF_32BIT_ADDR);                        \
 330                 clear_thread_flag(TIF_HYBRID_FPREGS);                   \
 331                 set_thread_flag(TIF_32BIT_FPREGS);                      \
 332                                                                         \
 333                 mips_set_personality_fp(state);                         \
 334                                                                         \
 335                 current->thread.abi = &mips_abi_32;                     \
 336         } while (0)
 337 #else
 338 #define __SET_PERSONALITY32_O32(ex, state)                              \
 339         do { } while (0)
 340 #endif
 341
 342 #ifdef CONFIG_MIPS32_COMPAT
 343 #define __SET_PERSONALITY32(ex, state)                                  \
 344 do {                                                                    \
 345         if ((((ex).e_flags & EF_MIPS_ABI2) != 0) &&                     \
 346              ((ex).e_flags & EF_MIPS_ABI) == 0)                         \
 347                 __SET_PERSONALITY32_N32();                              \
 348         else                                                            \
 349                 __SET_PERSONALITY32_O32(ex, state);                     \
 350 } while (0)
 351 #else
 352 #define __SET_PERSONALITY32(ex, state) do { } while (0)
 353 #endif
 354
 355 #define SET_PERSONALITY2(ex, state)                                     \
 356 do {                                                                    \
 357         unsigned int p;                                                 \
 358                                                                         \
 359         clear_thread_flag(TIF_32BIT_REGS);                              \
 360         clear_thread_flag(TIF_32BIT_FPREGS);                            \
 361         clear_thread_flag(TIF_HYBRID_FPREGS);                           \
 362         clear_thread_flag(TIF_32BIT_ADDR);                              \
 363                                                                         \
 364         if ((ex).e_ident[EI_CLASS] == ELFCLASS32)                       \
 365                 __SET_PERSONALITY32(ex, state);                         \
 366         else                                                            \
 367                 current->thread.abi = &mips_abi;                        \
 368                                                                         \
 369         current->thread.fpu.fcr31 = boot_cpu_data.fpu_csr31;            \
 370                                                                         \
 371         p = personality(current->personality);                          \
 372         if (p != PER_LINUX32 && p != PER_LINUX)                         \
 373                 set_personality(PER_LINUX);                             \
 374 } while (0)
 375
 376 #endif /* CONFIG_64BIT */
 377
 378 #define CORE_DUMP_USE_REGSET
 379 #define ELF_EXEC_PAGESIZE       PAGE_SIZE
 380
 381 /* This yields a mask that user programs can use to figure out what
 382    instruction set this cpu supports.  This could be done in userspace,
 383    but it's not easy, and we've already done it here.  */
 384
 385 #define ELF_HWCAP       (elf_hwcap)
 386 extern unsigned int elf_hwcap;
 387 #include <asm/hwcap.h>
 388
 389 /*
 390  * This yields a string that ld.so will use to load implementation
 391  * specific libraries for optimization.  This is more specific in
 392  * intent than poking at uname or /proc/cpuinfo.
 393  */
 394
 395 #define ELF_PLATFORM  __elf_platform
 396 extern const char *__elf_platform;
 397
 398 /*
 399  * See comments in asm-alpha/elf.h, this is the same thing
 400  * on the MIPS.
 401  */
 402 #define ELF_PLAT_INIT(_r, load_addr)    do { \
 403         _r->regs[1] = _r->regs[2] = _r->regs[3] = _r->regs[4] = 0;      \
 404         _r->regs[5] = _r->regs[6] = _r->regs[7] = _r->regs[8] = 0;      \
 405         _r->regs[9] = _r->regs[10] = _r->regs[11] = _r->regs[12] = 0;   \
 406         _r->regs[13] = _r->regs[14] = _r->regs[15] = _r->regs[16] = 0;  \
 407         _r->regs[17] = _r->regs[18] = _r->regs[19] = _r->regs[20] = 0;  \
 408         _r->regs[21] = _r->regs[22] = _r->regs[23] = _r->regs[24] = 0;  \
 409         _r->regs[25] = _r->regs[26] = _r->regs[27] = _r->regs[28] = 0;  \
 410         _r->regs[30] = _r->regs[31] = 0;                                \
 411 } while (0)
 412
 413 /* This is the location that an ET_DYN program is loaded if exec'ed.  Typical
 414    use of this is to invoke "./ld.so someprog" to test out a new version of
 415    the loader.  We need to make sure that it is out of the way of the program
 416    that it will "exec", and that there is sufficient room for the brk.  */
 417
 418 #ifndef ELF_ET_DYN_BASE
 419 #define ELF_ET_DYN_BASE         (TASK_SIZE / 3 * 2)
 420 #endif
 421
 422 #define ARCH_HAS_SETUP_ADDITIONAL_PAGES 1
 423 struct linux_binprm;
 424 extern int arch_setup_additional_pages(struct linux_binprm *bprm,
 425                                        int uses_interp);
 426
 427 struct arch_elf_state {
 428         int fp_abi;
 429         int interp_fp_abi;
 430         int overall_fp_mode;
 431 };
 432
 433 #define MIPS_ABI_FP_UNKNOWN     (-1)    /* Unknown FP ABI (kernel internal) */
 434
 435 #define INIT_ARCH_ELF_STATE {                   \
 436         .fp_abi = MIPS_ABI_FP_UNKNOWN,          \
 437         .interp_fp_abi = MIPS_ABI_FP_UNKNOWN,   \
 438         .overall_fp_mode = -1,                  \
 439 }
 440
 441 extern int arch_elf_pt_proc(void *ehdr, void *phdr, struct file *elf,
 442                             bool is_interp, struct arch_elf_state *state);
 443
 444 extern int arch_check_elf(void *ehdr, bool has_interpreter,
 445                           struct arch_elf_state *state);
 446
 447 extern void mips_set_personality_fp(struct arch_elf_state *state);
 448
 449 #endif /* _ASM_ELF_H */