arch/arm64/include/asm/elf.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Copyright (C) 2012 ARM Ltd.
   4  */
   5 #ifndef __ASM_ELF_H
   6 #define __ASM_ELF_H
   7
   8 #include <asm/hwcap.h>
   9
  10 /*
  11  * ELF register definitions..
  12  */
  13 #include <asm/ptrace.h>
  14 #include <asm/user.h>
  15
  16 /*
  17  * AArch64 static relocation types.
  18  */
  19
  20 /* Miscellaneous. */
  21 #define R_ARM_NONE                      0
  22 #define R_AARCH64_NONE                  256
  23
  24 /* Data. */
  25 #define R_AARCH64_ABS64                 257
  26 #define R_AARCH64_ABS32                 258
  27 #define R_AARCH64_ABS16                 259
  28 #define R_AARCH64_PREL64                260
  29 #define R_AARCH64_PREL32                261
  30 #define R_AARCH64_PREL16                262
  31
  32 /* Instructions. */
  33 #define R_AARCH64_MOVW_UABS_G0          263
  34 #define R_AARCH64_MOVW_UABS_G0_NC       264
  35 #define R_AARCH64_MOVW_UABS_G1          265
  36 #define R_AARCH64_MOVW_UABS_G1_NC       266
  37 #define R_AARCH64_MOVW_UABS_G2          267
  38 #define R_AARCH64_MOVW_UABS_G2_NC       268
  39 #define R_AARCH64_MOVW_UABS_G3          269
  40
  41 #define R_AARCH64_MOVW_SABS_G0          270
  42 #define R_AARCH64_MOVW_SABS_G1          271
  43 #define R_AARCH64_MOVW_SABS_G2          272
  44
  45 #define R_AARCH64_LD_PREL_LO19          273
  46 #define R_AARCH64_ADR_PREL_LO21         274
  47 #define R_AARCH64_ADR_PREL_PG_HI21      275
  48 #define R_AARCH64_ADR_PREL_PG_HI21_NC   276
  49 #define R_AARCH64_ADD_ABS_LO12_NC       277
  50 #define R_AARCH64_LDST8_ABS_LO12_NC     278
  51
  52 #define R_AARCH64_TSTBR14               279
  53 #define R_AARCH64_CONDBR19              280
  54 #define R_AARCH64_JUMP26                282
  55 #define R_AARCH64_CALL26                283
  56 #define R_AARCH64_LDST16_ABS_LO12_NC    284
  57 #define R_AARCH64_LDST32_ABS_LO12_NC    285
  58 #define R_AARCH64_LDST64_ABS_LO12_NC    286
  59 #define R_AARCH64_LDST128_ABS_LO12_NC   299
  60
  61 #define R_AARCH64_MOVW_PREL_G0          287
  62 #define R_AARCH64_MOVW_PREL_G0_NC       288
  63 #define R_AARCH64_MOVW_PREL_G1          289
  64 #define R_AARCH64_MOVW_PREL_G1_NC       290
  65 #define R_AARCH64_MOVW_PREL_G2          291
  66 #define R_AARCH64_MOVW_PREL_G2_NC       292
  67 #define R_AARCH64_MOVW_PREL_G3          293
  68
  69 #define R_AARCH64_RELATIVE              1027
  70
  71 /*
  72  * These are used to set parameters in the core dumps.
  73  */
  74 #define ELF_CLASS       ELFCLASS64
  75 #ifdef __AARCH64EB__
  76 #define ELF_DATA        ELFDATA2MSB
  77 #else
  78 #define ELF_DATA        ELFDATA2LSB
  79 #endif
  80 #define ELF_ARCH        EM_AARCH64
  81
  82 /*
  83  * This yields a string that ld.so will use to load implementation
  84  * specific libraries for optimization.  This is more specific in
  85  * intent than poking at uname or /proc/cpuinfo.
  86  */
  87 #define ELF_PLATFORM_SIZE       16
  88 #ifdef __AARCH64EB__
  89 #define ELF_PLATFORM            ("aarch64_be")
  90 #else
  91 #define ELF_PLATFORM            ("aarch64")
  92 #endif
  93
  94 /*
  95  * This is used to ensure we don't load something for the wrong architecture.
  96  */
  97 #define elf_check_arch(x)               ((x)->e_machine == EM_AARCH64)
  98
  99 /*
 100  * An executable for which elf_read_implies_exec() returns TRUE will
 101  * have the READ_IMPLIES_EXEC personality flag set automatically.
 102  *
 103  * The decision process for determining the results are:
 104  *
 105  *                CPU*: | arm32      | arm64      |
 106  * ELF:                 |            |            |
 107  * ---------------------|------------|------------|
 108  * missing PT_GNU_STACK | exec-all   | exec-all   |
 109  * PT_GNU_STACK == RWX  | exec-stack | exec-stack |
 110  * PT_GNU_STACK == RW   | exec-none  | exec-none  |
 111  *
 112  *  exec-all  : all PROT_READ user mappings are executable, except when
 113  *              backed by files on a noexec-filesystem.
 114  *  exec-none : only PROT_EXEC user mappings are executable.
 115  *  exec-stack: only the stack and PROT_EXEC user mappings are executable.
 116  *
 117  *  *all arm64 CPUs support NX, so there is no "lacks NX" column.
 118  *
 119  */
 120 #define elf_read_implies_exec(ex, stk)  (stk == EXSTACK_DEFAULT)
 121
 122 #define CORE_DUMP_USE_REGSET
 123 #define ELF_EXEC_PAGESIZE       PAGE_SIZE
 124
 125 /*
 126  * This is the base location for PIE (ET_DYN with INTERP) loads. On
 127  * 64-bit, this is above 4GB to leave the entire 32-bit address
 128  * space open for things that want to use the area for 32-bit pointers.
 129  */
 130 #ifdef CONFIG_ARM64_FORCE_52BIT
 131 #define ELF_ET_DYN_BASE         (2 * TASK_SIZE_64 / 3)
 132 #else
 133 #define ELF_ET_DYN_BASE         (2 * DEFAULT_MAP_WINDOW_64 / 3)
 134 #endif /* CONFIG_ARM64_FORCE_52BIT */
 135
 136 #ifndef __ASSEMBLY__
 137
 138 #include <linux/bug.h>
 139 #include <asm/processor.h> /* for signal_minsigstksz, used by ARCH_DLINFO */
 140
 141 typedef unsigned long elf_greg_t;
 142
 143 #define ELF_NGREG (sizeof(struct user_pt_regs) / sizeof(elf_greg_t))
 144 #define ELF_CORE_COPY_REGS(dest, regs)  \
 145         *(struct user_pt_regs *)&(dest) = (regs)->user_regs;
 146
 147 typedef elf_greg_t elf_gregset_t[ELF_NGREG];
 148 typedef struct user_fpsimd_state elf_fpregset_t;
 149
 150 /*
 151  * When the program starts, a1 contains a pointer to a function to be
 152  * registered with atexit, as per the SVR4 ABI.  A value of 0 means we have no
 153  * such handler.
 154  */
 155 #define ELF_PLAT_INIT(_r, load_addr)    (_r)->regs[0] = 0
 156
 157 #define SET_PERSONALITY(ex)                                             \
 158 ({                                                                      \
 159         clear_thread_flag(TIF_32BIT);                                   \
 160         current->personality &= ~READ_IMPLIES_EXEC;                     \
 161 })
 162
 163 /* update AT_VECTOR_SIZE_ARCH if the number of NEW_AUX_ENT entries changes */
 164 #define ARCH_DLINFO                                                     \
 165 do {                                                                    \
 166         NEW_AUX_ENT(AT_SYSINFO_EHDR,                                    \
 167                     (elf_addr_t)current->mm->context.vdso);             \
 168                                                                         \
 169         /*                                                              \
 170          * Should always be nonzero unless there's a kernel bug.        \
 171          * If we haven't determined a sensible value to give to         \
 172          * userspace, omit the entry:                                   \
 173          */                                                             \
 174         if (likely(signal_minsigstksz))                                 \
 175                 NEW_AUX_ENT(AT_MINSIGSTKSZ, signal_minsigstksz);        \
 176         else                                                            \
 177                 NEW_AUX_ENT(AT_IGNORE, 0);                              \
 178 } while (0)
 179
 180 #define ARCH_HAS_SETUP_ADDITIONAL_PAGES
 181 struct linux_binprm;
 182 extern int arch_setup_additional_pages(struct linux_binprm *bprm,
 183                                        int uses_interp);
 184
 185 /* 1GB of VA */
 186 #ifdef CONFIG_COMPAT
 187 #define STACK_RND_MASK                  (test_thread_flag(TIF_32BIT) ? \
 188                                                 0x7ff >> (PAGE_SHIFT - 12) : \
 189                                                 0x3ffff >> (PAGE_SHIFT - 12))
 190 #else
 191 #define STACK_RND_MASK                  (0x3ffff >> (PAGE_SHIFT - 12))
 192 #endif
 193
 194 #ifdef __AARCH64EB__
 195 #define COMPAT_ELF_PLATFORM             ("v8b")
 196 #else
 197 #define COMPAT_ELF_PLATFORM             ("v8l")
 198 #endif
 199
 200 #ifdef CONFIG_COMPAT
 201
 202 /* PIE load location for compat arm. Must match ARM ELF_ET_DYN_BASE. */
 203 #define COMPAT_ELF_ET_DYN_BASE          0x000400000UL
 204
 205 /* AArch32 registers. */
 206 #define COMPAT_ELF_NGREG                18
 207 typedef unsigned int                    compat_elf_greg_t;
 208 typedef compat_elf_greg_t               compat_elf_gregset_t[COMPAT_ELF_NGREG];
 209
 210 /* AArch32 EABI. */
 211 #define EF_ARM_EABI_MASK                0xff000000
 212 #define compat_elf_check_arch(x)        (system_supports_32bit_el0() && \
 213                                          ((x)->e_machine == EM_ARM) && \
 214                                          ((x)->e_flags & EF_ARM_EABI_MASK))
 215
 216 #define compat_start_thread             compat_start_thread
 217 /*
 218  * Unlike the native SET_PERSONALITY macro, the compat version maintains
 219  * READ_IMPLIES_EXEC across an execve() since this is the behaviour on
 220  * arch/arm/.
 221  */
 222 #define COMPAT_SET_PERSONALITY(ex)                                      \
 223 ({                                                                      \
 224         set_thread_flag(TIF_32BIT);                                     \
 225  })
 226 #ifdef CONFIG_COMPAT_VDSO
 227 #define COMPAT_ARCH_DLINFO                                              \
 228 do {                                                                    \
 229         /*                                                              \
 230          * Note that we use Elf64_Off instead of elf_addr_t because     \
 231          * elf_addr_t in compat is defined as Elf32_Addr and casting    \
 232          * current->mm->context.vdso to it triggers a cast warning of   \
 233          * cast from pointer to integer of different size.              \
 234          */                                                             \
 235         NEW_AUX_ENT(AT_SYSINFO_EHDR,                                    \
 236                         (Elf64_Off)current->mm->context.vdso);          \
 237 } while (0)
 238 #else
 239 #define COMPAT_ARCH_DLINFO
 240 #endif
 241 extern int aarch32_setup_additional_pages(struct linux_binprm *bprm,
 242                                           int uses_interp);
 243 #define compat_arch_setup_additional_pages \
 244                                         aarch32_setup_additional_pages
 245
 246 #endif /* CONFIG_COMPAT */
 247
 248 #endif /* !__ASSEMBLY__ */
 249
 250 #endif