arch/arm64/include/asm/elf.h

   1 /*
   2  * Copyright (C) 2012 ARM Ltd.
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 as
   6  * published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License
  14  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  15  */
  16 #ifndef __ASM_ELF_H
  17 #define __ASM_ELF_H
  18
  19 #include <asm/hwcap.h>
  20
  21 /*
  22  * ELF register definitions..
  23  */
  24 #include <asm/ptrace.h>
  25 #include <asm/user.h>
  26
  27 /*
  28  * AArch64 static relocation types.
  29  */
  30
  31 /* Miscellaneous. */
  32 #define R_ARM_NONE                      0
  33 #define R_AARCH64_NONE                  256
  34
  35 /* Data. */
  36 #define R_AARCH64_ABS64                 257
  37 #define R_AARCH64_ABS32                 258
  38 #define R_AARCH64_ABS16                 259
  39 #define R_AARCH64_PREL64                260
  40 #define R_AARCH64_PREL32                261
  41 #define R_AARCH64_PREL16                262
  42
  43 /* Instructions. */
  44 #define R_AARCH64_MOVW_UABS_G0          263
  45 #define R_AARCH64_MOVW_UABS_G0_NC       264
  46 #define R_AARCH64_MOVW_UABS_G1          265
  47 #define R_AARCH64_MOVW_UABS_G1_NC       266
  48 #define R_AARCH64_MOVW_UABS_G2          267
  49 #define R_AARCH64_MOVW_UABS_G2_NC       268
  50 #define R_AARCH64_MOVW_UABS_G3          269
  51
  52 #define R_AARCH64_MOVW_SABS_G0          270
  53 #define R_AARCH64_MOVW_SABS_G1          271
  54 #define R_AARCH64_MOVW_SABS_G2          272
  55
  56 #define R_AARCH64_LD_PREL_LO19          273
  57 #define R_AARCH64_ADR_PREL_LO21         274
  58 #define R_AARCH64_ADR_PREL_PG_HI21      275
  59 #define R_AARCH64_ADR_PREL_PG_HI21_NC   276
  60 #define R_AARCH64_ADD_ABS_LO12_NC       277
  61 #define R_AARCH64_LDST8_ABS_LO12_NC     278
  62
  63 #define R_AARCH64_TSTBR14               279
  64 #define R_AARCH64_CONDBR19              280
  65 #define R_AARCH64_JUMP26                282
  66 #define R_AARCH64_CALL26                283
  67 #define R_AARCH64_LDST16_ABS_LO12_NC    284
  68 #define R_AARCH64_LDST32_ABS_LO12_NC    285
  69 #define R_AARCH64_LDST64_ABS_LO12_NC    286
  70 #define R_AARCH64_LDST128_ABS_LO12_NC   299
  71
  72 #define R_AARCH64_MOVW_PREL_G0          287
  73 #define R_AARCH64_MOVW_PREL_G0_NC       288
  74 #define R_AARCH64_MOVW_PREL_G1          289
  75 #define R_AARCH64_MOVW_PREL_G1_NC       290
  76 #define R_AARCH64_MOVW_PREL_G2          291
  77 #define R_AARCH64_MOVW_PREL_G2_NC       292
  78 #define R_AARCH64_MOVW_PREL_G3          293
  79
  80 #define R_AARCH64_RELATIVE              1027
  81
  82 /*
  83  * These are used to set parameters in the core dumps.
  84  */
  85 #define ELF_CLASS       ELFCLASS64
  86 #ifdef __AARCH64EB__
  87 #define ELF_DATA        ELFDATA2MSB
  88 #else
  89 #define ELF_DATA        ELFDATA2LSB
  90 #endif
  91 #define ELF_ARCH        EM_AARCH64
  92
  93 /*
  94  * This yields a string that ld.so will use to load implementation
  95  * specific libraries for optimization.  This is more specific in
  96  * intent than poking at uname or /proc/cpuinfo.
  97  */
  98 #define ELF_PLATFORM_SIZE       16
  99 #ifdef __AARCH64EB__
 100 #define ELF_PLATFORM            ("aarch64_be")
 101 #else
 102 #define ELF_PLATFORM            ("aarch64")
 103 #endif
 104
 105 /*
 106  * This is used to ensure we don't load something for the wrong architecture.
 107  */
 108 #define elf_check_arch(x)               ((x)->e_machine == EM_AARCH64)
 109
 110 #define elf_read_implies_exec(ex,stk)   (stk != EXSTACK_DISABLE_X)
 111
 112 #define CORE_DUMP_USE_REGSET
 113 #define ELF_EXEC_PAGESIZE       PAGE_SIZE
 114
 115 /*
 116  * This is the base location for PIE (ET_DYN with INTERP) loads. On
 117  * 64-bit, this is above 4GB to leave the entire 32-bit address
 118  * space open for things that want to use the area for 32-bit pointers.
 119  */
 120 #define ELF_ET_DYN_BASE         (2 * TASK_SIZE_64 / 3)
 121
 122 #ifndef __ASSEMBLY__
 123
 124 typedef unsigned long elf_greg_t;
 125
 126 #define ELF_NGREG (sizeof(struct user_pt_regs) / sizeof(elf_greg_t))
 127 #define ELF_CORE_COPY_REGS(dest, regs)  \
 128         *(struct user_pt_regs *)&(dest) = (regs)->user_regs;
 129
 130 typedef elf_greg_t elf_gregset_t[ELF_NGREG];
 131 typedef struct user_fpsimd_state elf_fpregset_t;
 132
 133 /*
 134  * When the program starts, a1 contains a pointer to a function to be
 135  * registered with atexit, as per the SVR4 ABI.  A value of 0 means we have no
 136  * such handler.
 137  */
 138 #define ELF_PLAT_INIT(_r, load_addr)    (_r)->regs[0] = 0
 139
 140 #define SET_PERSONALITY(ex)                                             \
 141 ({                                                                      \
 142         clear_bit(TIF_32BIT, &current->mm->context.flags);              \
 143         clear_thread_flag(TIF_32BIT);                                   \
 144         current->personality &= ~READ_IMPLIES_EXEC;                     \
 145 })
 146
 147 /* update AT_VECTOR_SIZE_ARCH if the number of NEW_AUX_ENT entries changes */
 148 #define ARCH_DLINFO                                                     \
 149 do {                                                                    \
 150         NEW_AUX_ENT(AT_SYSINFO_EHDR,                                    \
 151                     (elf_addr_t)current->mm->context.vdso);             \
 152 } while (0)
 153
 154 #define ARCH_HAS_SETUP_ADDITIONAL_PAGES
 155 struct linux_binprm;
 156 extern int arch_setup_additional_pages(struct linux_binprm *bprm,
 157                                        int uses_interp);
 158
 159 /* 1GB of VA */
 160 #ifdef CONFIG_COMPAT
 161 #define STACK_RND_MASK                  (test_thread_flag(TIF_32BIT) ? \
 162                                                 0x7ff >> (PAGE_SHIFT - 12) : \
 163                                                 0x3ffff >> (PAGE_SHIFT - 12))
 164 #else
 165 #define STACK_RND_MASK                  (0x3ffff >> (PAGE_SHIFT - 12))
 166 #endif
 167
 168 #ifdef __AARCH64EB__
 169 #define COMPAT_ELF_PLATFORM             ("v8b")
 170 #else
 171 #define COMPAT_ELF_PLATFORM             ("v8l")
 172 #endif
 173
 174 #ifdef CONFIG_COMPAT
 175
 176 /* PIE load location for compat arm. Must match ARM ELF_ET_DYN_BASE. */
 177 #define COMPAT_ELF_ET_DYN_BASE          0x000400000UL
 178
 179 /* AArch32 registers. */
 180 #define COMPAT_ELF_NGREG                18
 181 typedef unsigned int                    compat_elf_greg_t;
 182 typedef compat_elf_greg_t               compat_elf_gregset_t[COMPAT_ELF_NGREG];
 183
 184 /* AArch32 EABI. */
 185 #define EF_ARM_EABI_MASK                0xff000000
 186 #define compat_elf_check_arch(x)        (system_supports_32bit_el0() && \
 187                                          ((x)->e_machine == EM_ARM) && \
 188                                          ((x)->e_flags & EF_ARM_EABI_MASK))
 189
 190 #define compat_start_thread             compat_start_thread
 191 /*
 192  * Unlike the native SET_PERSONALITY macro, the compat version inherits
 193  * READ_IMPLIES_EXEC across a fork() since this is the behaviour on
 194  * arch/arm/.
 195  */
 196 #define COMPAT_SET_PERSONALITY(ex)                                      \
 197 ({                                                                      \
 198         set_bit(TIF_32BIT, &current->mm->context.flags);                \
 199         set_thread_flag(TIF_32BIT);                                     \
 200  })
 201 #define COMPAT_ARCH_DLINFO
 202 extern int aarch32_setup_vectors_page(struct linux_binprm *bprm,
 203                                       int uses_interp);
 204 #define compat_arch_setup_additional_pages \
 205                                         aarch32_setup_vectors_page
 206
 207 #endif /* CONFIG_COMPAT */
 208
 209 #endif /* !__ASSEMBLY__ */
 210
 211 #endif