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