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/cpu-info.h>
  16 #include <asm/current.h>
  17
  18 /* ELF header e_flags defines. */
  19 /* MIPS architecture level. */
  20 #define EF_MIPS_ARCH_1          0x00000000      /* -mips1 code.  */
  21 #define EF_MIPS_ARCH_2          0x10000000      /* -mips2 code.  */
  22 #define EF_MIPS_ARCH_3          0x20000000      /* -mips3 code.  */
  23 #define EF_MIPS_ARCH_4          0x30000000      /* -mips4 code.  */
  24 #define EF_MIPS_ARCH_5          0x40000000      /* -mips5 code.  */
  25 #define EF_MIPS_ARCH_32         0x50000000      /* MIPS32 code.  */
  26 #define EF_MIPS_ARCH_64         0x60000000      /* MIPS64 code.  */
  27 #define EF_MIPS_ARCH_32R2       0x70000000      /* MIPS32 R2 code.  */
  28 #define EF_MIPS_ARCH_64R2       0x80000000      /* MIPS64 R2 code.  */
  29
  30 /* The ABI of a file. */
  31 #define EF_MIPS_ABI_O32         0x00001000      /* O32 ABI.  */
  32 #define EF_MIPS_ABI_O64         0x00002000      /* O32 extended for 64 bit.  */
  33
  34 #define PT_MIPS_REGINFO         0x70000000
  35 #define PT_MIPS_RTPROC          0x70000001
  36 #define PT_MIPS_OPTIONS         0x70000002
  37 #define PT_MIPS_ABIFLAGS        0x70000003
  38
  39 /* Flags in the e_flags field of the header */
  40 #define EF_MIPS_NOREORDER       0x00000001
  41 #define EF_MIPS_PIC             0x00000002
  42 #define EF_MIPS_CPIC            0x00000004
  43 #define EF_MIPS_ABI2            0x00000020
  44 #define EF_MIPS_OPTIONS_FIRST   0x00000080
  45 #define EF_MIPS_32BITMODE       0x00000100
  46 #define EF_MIPS_FP64            0x00000200
  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  * This range is reserved for vendor specific relocations.
 115  */
 116 #define R_MIPS_LOVENDOR         100
 117 #define R_MIPS_HIVENDOR         127
 118
 119 #define SHN_MIPS_ACCOMON        0xff00          /* Allocated common symbols */
 120 #define SHN_MIPS_TEXT           0xff01          /* Allocated test symbols.  */
 121 #define SHN_MIPS_DATA           0xff02          /* Allocated data symbols.  */
 122 #define SHN_MIPS_SCOMMON        0xff03          /* Small common symbols */
 123 #define SHN_MIPS_SUNDEFINED     0xff04          /* Small undefined symbols */
 124
 125 #define SHT_MIPS_LIST           0x70000000
 126 #define SHT_MIPS_CONFLICT       0x70000002
 127 #define SHT_MIPS_GPTAB          0x70000003
 128 #define SHT_MIPS_UCODE          0x70000004
 129 #define SHT_MIPS_DEBUG          0x70000005
 130 #define SHT_MIPS_REGINFO        0x70000006
 131 #define SHT_MIPS_PACKAGE        0x70000007
 132 #define SHT_MIPS_PACKSYM        0x70000008
 133 #define SHT_MIPS_RELD           0x70000009
 134 #define SHT_MIPS_IFACE          0x7000000b
 135 #define SHT_MIPS_CONTENT        0x7000000c
 136 #define SHT_MIPS_OPTIONS        0x7000000d
 137 #define SHT_MIPS_SHDR           0x70000010
 138 #define SHT_MIPS_FDESC          0x70000011
 139 #define SHT_MIPS_EXTSYM         0x70000012
 140 #define SHT_MIPS_DENSE          0x70000013
 141 #define SHT_MIPS_PDESC          0x70000014
 142 #define SHT_MIPS_LOCSYM         0x70000015
 143 #define SHT_MIPS_AUXSYM         0x70000016
 144 #define SHT_MIPS_OPTSYM         0x70000017
 145 #define SHT_MIPS_LOCSTR         0x70000018
 146 #define SHT_MIPS_LINE           0x70000019
 147 #define SHT_MIPS_RFDESC         0x7000001a
 148 #define SHT_MIPS_DELTASYM       0x7000001b
 149 #define SHT_MIPS_DELTAINST      0x7000001c
 150 #define SHT_MIPS_DELTACLASS     0x7000001d
 151 #define SHT_MIPS_DWARF          0x7000001e
 152 #define SHT_MIPS_DELTADECL      0x7000001f
 153 #define SHT_MIPS_SYMBOL_LIB     0x70000020
 154 #define SHT_MIPS_EVENTS         0x70000021
 155 #define SHT_MIPS_TRANSLATE      0x70000022
 156 #define SHT_MIPS_PIXIE          0x70000023
 157 #define SHT_MIPS_XLATE          0x70000024
 158 #define SHT_MIPS_XLATE_DEBUG    0x70000025
 159 #define SHT_MIPS_WHIRL          0x70000026
 160 #define SHT_MIPS_EH_REGION      0x70000027
 161 #define SHT_MIPS_XLATE_OLD      0x70000028
 162 #define SHT_MIPS_PDR_EXCEPTION  0x70000029
 163
 164 #define SHF_MIPS_GPREL          0x10000000
 165 #define SHF_MIPS_MERGE          0x20000000
 166 #define SHF_MIPS_ADDR           0x40000000
 167 #define SHF_MIPS_STRING         0x80000000
 168 #define SHF_MIPS_NOSTRIP        0x08000000
 169 #define SHF_MIPS_LOCAL          0x04000000
 170 #define SHF_MIPS_NAMES          0x02000000
 171 #define SHF_MIPS_NODUPES        0x01000000
 172
 173 #ifndef ELF_ARCH
 174 /* ELF register definitions */
 175 #define ELF_NGREG       45
 176 #define ELF_NFPREG      33
 177
 178 typedef unsigned long elf_greg_t;
 179 typedef elf_greg_t elf_gregset_t[ELF_NGREG];
 180
 181 typedef double elf_fpreg_t;
 182 typedef elf_fpreg_t elf_fpregset_t[ELF_NFPREG];
 183
 184 struct mips_elf_abiflags_v0 {
 185         uint16_t version;       /* Version of flags structure */
 186         uint8_t isa_level;      /* The level of the ISA: 1-5, 32, 64 */
 187         uint8_t isa_rev;        /* The revision of ISA: 0 for MIPS V and below,
 188                                    1-n otherwise */
 189         uint8_t gpr_size;       /* The size of general purpose registers */
 190         uint8_t cpr1_size;      /* The size of co-processor 1 registers */
 191         uint8_t cpr2_size;      /* The size of co-processor 2 registers */
 192         uint8_t fp_abi;         /* The floating-point ABI */
 193         uint32_t isa_ext;       /* Mask of processor-specific extensions */
 194         uint32_t ases;          /* Mask of ASEs used */
 195         uint32_t flags1;        /* Mask of general flags */
 196         uint32_t flags2;
 197 };
 198
 199 #define MIPS_ABI_FP_ANY         0       /* FP ABI doesn't matter */
 200 #define MIPS_ABI_FP_DOUBLE      1       /* -mdouble-float */
 201 #define MIPS_ABI_FP_SINGLE      2       /* -msingle-float */
 202 #define MIPS_ABI_FP_SOFT        3       /* -msoft-float */
 203 #define MIPS_ABI_FP_OLD_64      4       /* -mips32r2 -mfp64 */
 204 #define MIPS_ABI_FP_XX          5       /* -mfpxx */
 205 #define MIPS_ABI_FP_64          6       /* -mips32r2 -mfp64 */
 206 #define MIPS_ABI_FP_64A         7       /* -mips32r2 -mfp64 -mno-odd-spreg */
 207
 208 #ifdef CONFIG_32BIT
 209
 210 /*
 211  * In order to be sure that we don't attempt to execute an O32 binary which
 212  * requires 64 bit FP (FR=1) on a system which does not support it we refuse
 213  * to execute any binary which has bits specified by the following macro set
 214  * in its ELF header flags.
 215  */
 216 #ifdef CONFIG_MIPS_O32_FP64_SUPPORT
 217 # define __MIPS_O32_FP64_MUST_BE_ZERO   0
 218 #else
 219 # define __MIPS_O32_FP64_MUST_BE_ZERO   EF_MIPS_FP64
 220 #endif
 221
 222 /*
 223  * This is used to ensure we don't load something for the wrong architecture.
 224  */
 225 #define elf_check_arch(hdr)                                             \
 226 ({                                                                      \
 227         int __res = 1;                                                  \
 228         struct elfhdr *__h = (hdr);                                     \
 229                                                                         \
 230         if (__h->e_machine != EM_MIPS)                                  \
 231                 __res = 0;                                              \
 232         if (__h->e_ident[EI_CLASS] != ELFCLASS32)                       \
 233                 __res = 0;                                              \
 234         if ((__h->e_flags & EF_MIPS_ABI2) != 0)                         \
 235                 __res = 0;                                              \
 236         if (((__h->e_flags & EF_MIPS_ABI) != 0) &&                      \
 237             ((__h->e_flags & EF_MIPS_ABI) != EF_MIPS_ABI_O32))          \
 238                 __res = 0;                                              \
 239         if (__h->e_flags & __MIPS_O32_FP64_MUST_BE_ZERO)                \
 240                 __res = 0;                                              \
 241                                                                         \
 242         __res;                                                          \
 243 })
 244
 245 /*
 246  * These are used to set parameters in the core dumps.
 247  */
 248 #define ELF_CLASS       ELFCLASS32
 249
 250 #endif /* CONFIG_32BIT */
 251
 252 #ifdef CONFIG_64BIT
 253 /*
 254  * This is used to ensure we don't load something for the wrong architecture.
 255  */
 256 #define elf_check_arch(hdr)                                             \
 257 ({                                                                      \
 258         int __res = 1;                                                  \
 259         struct elfhdr *__h = (hdr);                                     \
 260                                                                         \
 261         if (__h->e_machine != EM_MIPS)                                  \
 262                 __res = 0;                                              \
 263         if (__h->e_ident[EI_CLASS] != ELFCLASS64)                       \
 264                 __res = 0;                                              \
 265                                                                         \
 266         __res;                                                          \
 267 })
 268
 269 /*
 270  * These are used to set parameters in the core dumps.
 271  */
 272 #define ELF_CLASS       ELFCLASS64
 273
 274 #endif /* CONFIG_64BIT */
 275
 276 /*
 277  * These are used to set parameters in the core dumps.
 278  */
 279 #ifdef __MIPSEB__
 280 #define ELF_DATA        ELFDATA2MSB
 281 #elif defined(__MIPSEL__)
 282 #define ELF_DATA        ELFDATA2LSB
 283 #endif
 284 #define ELF_ARCH        EM_MIPS
 285
 286 #endif /* !defined(ELF_ARCH) */
 287
 288 struct mips_abi;
 289
 290 extern struct mips_abi mips_abi;
 291 extern struct mips_abi mips_abi_32;
 292 extern struct mips_abi mips_abi_n32;
 293
 294 #ifdef CONFIG_32BIT
 295
 296 #define SET_PERSONALITY2(ex, state)                                     \
 297 do {                                                                    \
 298         if (personality(current->personality) != PER_LINUX)             \
 299                 set_personality(PER_LINUX);                             \
 300                                                                         \
 301         clear_thread_flag(TIF_HYBRID_FPREGS);                           \
 302         set_thread_flag(TIF_32BIT_FPREGS);                              \
 303                                                                         \
 304         mips_set_personality_fp(state);                                 \
 305                                                                         \
 306         current->thread.abi = &mips_abi;                                \
 307                                                                         \
 308         current->thread.fpu.fcr31 = boot_cpu_data.fpu_csr31;            \
 309 } while (0)
 310
 311 #endif /* CONFIG_32BIT */
 312
 313 #ifdef CONFIG_64BIT
 314
 315 #ifdef CONFIG_MIPS32_N32
 316 #define __SET_PERSONALITY32_N32()                                       \
 317         do {                                                            \
 318                 set_thread_flag(TIF_32BIT_ADDR);                        \
 319                 current->thread.abi = &mips_abi_n32;                    \
 320         } while (0)
 321 #else
 322 #define __SET_PERSONALITY32_N32()                                       \
 323         do { } while (0)
 324 #endif
 325
 326 #ifdef CONFIG_MIPS32_O32
 327 #define __SET_PERSONALITY32_O32(ex, state)                              \
 328         do {                                                            \
 329                 set_thread_flag(TIF_32BIT_REGS);                        \
 330                 set_thread_flag(TIF_32BIT_ADDR);                        \
 331                 clear_thread_flag(TIF_HYBRID_FPREGS);                   \
 332                 set_thread_flag(TIF_32BIT_FPREGS);                      \
 333                                                                         \
 334                 mips_set_personality_fp(state);                         \
 335                                                                         \
 336                 current->thread.abi = &mips_abi_32;                     \
 337         } while (0)
 338 #else
 339 #define __SET_PERSONALITY32_O32(ex, state)                              \
 340         do { } while (0)
 341 #endif
 342
 343 #ifdef CONFIG_MIPS32_COMPAT
 344 #define __SET_PERSONALITY32(ex, state)                                  \
 345 do {                                                                    \
 346         if ((((ex).e_flags & EF_MIPS_ABI2) != 0) &&                     \
 347              ((ex).e_flags & EF_MIPS_ABI) == 0)                         \
 348                 __SET_PERSONALITY32_N32();                              \
 349         else                                                            \
 350                 __SET_PERSONALITY32_O32(ex, state);                     \
 351 } while (0)
 352 #else
 353 #define __SET_PERSONALITY32(ex, state) do { } while (0)
 354 #endif
 355
 356 #define SET_PERSONALITY2(ex, state)                                     \
 357 do {                                                                    \
 358         unsigned int p;                                                 \
 359                                                                         \
 360         clear_thread_flag(TIF_32BIT_REGS);                              \
 361         clear_thread_flag(TIF_32BIT_FPREGS);                            \
 362         clear_thread_flag(TIF_HYBRID_FPREGS);                           \
 363         clear_thread_flag(TIF_32BIT_ADDR);                              \
 364                                                                         \
 365         if ((ex).e_ident[EI_CLASS] == ELFCLASS32)                       \
 366                 __SET_PERSONALITY32(ex, state);                         \
 367         else                                                            \
 368                 current->thread.abi = &mips_abi;                        \
 369                                                                         \
 370         current->thread.fpu.fcr31 = boot_cpu_data.fpu_csr31;            \
 371                                                                         \
 372         p = personality(current->personality);                          \
 373         if (p != PER_LINUX32 && p != PER_LINUX)                         \
 374                 set_personality(PER_LINUX);                             \
 375 } while (0)
 376
 377 #endif /* CONFIG_64BIT */
 378
 379 #define CORE_DUMP_USE_REGSET
 380 #define ELF_EXEC_PAGESIZE       PAGE_SIZE
 381
 382 /* This yields a mask that user programs can use to figure out what
 383    instruction set this cpu supports.  This could be done in userspace,
 384    but it's not easy, and we've already done it here.  */
 385
 386 #define ELF_HWCAP       (elf_hwcap)
 387 extern unsigned int elf_hwcap;
 388 #include <asm/hwcap.h>
 389
 390 /*
 391  * This yields a string that ld.so will use to load implementation
 392  * specific libraries for optimization.  This is more specific in
 393  * intent than poking at uname or /proc/cpuinfo.
 394  */
 395
 396 #define ELF_PLATFORM  __elf_platform
 397 extern const char *__elf_platform;
 398
 399 /*
 400  * See comments in asm-alpha/elf.h, this is the same thing
 401  * on the MIPS.
 402  */
 403 #define ELF_PLAT_INIT(_r, load_addr)    do { \
 404         _r->regs[1] = _r->regs[2] = _r->regs[3] = _r->regs[4] = 0;      \
 405         _r->regs[5] = _r->regs[6] = _r->regs[7] = _r->regs[8] = 0;      \
 406         _r->regs[9] = _r->regs[10] = _r->regs[11] = _r->regs[12] = 0;   \
 407         _r->regs[13] = _r->regs[14] = _r->regs[15] = _r->regs[16] = 0;  \
 408         _r->regs[17] = _r->regs[18] = _r->regs[19] = _r->regs[20] = 0;  \
 409         _r->regs[21] = _r->regs[22] = _r->regs[23] = _r->regs[24] = 0;  \
 410         _r->regs[25] = _r->regs[26] = _r->regs[27] = _r->regs[28] = 0;  \
 411         _r->regs[30] = _r->regs[31] = 0;                                \
 412 } while (0)
 413
 414 /* This is the location that an ET_DYN program is loaded if exec'ed.  Typical
 415    use of this is to invoke "./ld.so someprog" to test out a new version of
 416    the loader.  We need to make sure that it is out of the way of the program
 417    that it will "exec", and that there is sufficient room for the brk.  */
 418
 419 #ifndef ELF_ET_DYN_BASE
 420 #define ELF_ET_DYN_BASE         (TASK_SIZE / 3 * 2)
 421 #endif
 422
 423 #define ARCH_DLINFO                                                     \
 424 do {                                                                    \
 425         NEW_AUX_ENT(AT_SYSINFO_EHDR,                                    \
 426                     (unsigned long)current->mm->context.vdso);          \
 427 } while (0)
 428
 429 #define ARCH_HAS_SETUP_ADDITIONAL_PAGES 1
 430 struct linux_binprm;
 431 extern int arch_setup_additional_pages(struct linux_binprm *bprm,
 432                                        int uses_interp);
 433
 434 struct arch_elf_state {
 435         int fp_abi;
 436         int interp_fp_abi;
 437         int overall_fp_mode;
 438 };
 439
 440 #define MIPS_ABI_FP_UNKNOWN     (-1)    /* Unknown FP ABI (kernel internal) */
 441
 442 #define INIT_ARCH_ELF_STATE {                   \
 443         .fp_abi = MIPS_ABI_FP_UNKNOWN,          \
 444         .interp_fp_abi = MIPS_ABI_FP_UNKNOWN,   \
 445         .overall_fp_mode = -1,                  \
 446 }
 447
 448 extern int arch_elf_pt_proc(void *ehdr, void *phdr, struct file *elf,
 449                             bool is_interp, struct arch_elf_state *state);
 450
 451 extern int arch_check_elf(void *ehdr, bool has_interpreter, void *interp_ehdr,
 452                           struct arch_elf_state *state);
 453
 454 extern void mips_set_personality_fp(struct arch_elf_state *state);
 455
 456 #endif /* _ASM_ELF_H */