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 #define elf_read_implies_exec(ex,stk) (stk != EXSTACK_DISABLE_X) 100 101 #define CORE_DUMP_USE_REGSET 102 #define ELF_EXEC_PAGESIZE PAGE_SIZE 103 104 /* 105 * This is the base location for PIE (ET_DYN with INTERP) loads. On 106 * 64-bit, this is above 4GB to leave the entire 32-bit address 107 * space open for things that want to use the area for 32-bit pointers. 108 */ 109 #ifdef CONFIG_ARM64_FORCE_52BIT 110 #define ELF_ET_DYN_BASE (2 * TASK_SIZE_64 / 3) 111 #else 112 #define ELF_ET_DYN_BASE (2 * DEFAULT_MAP_WINDOW_64 / 3) 113 #endif /* CONFIG_ARM64_FORCE_52BIT */ 114 115 #ifndef __ASSEMBLY__ 116 117 #include <linux/bug.h> 118 #include <asm/processor.h> /* for signal_minsigstksz, used by ARCH_DLINFO */ 119 120 typedef unsigned long elf_greg_t; 121 122 #define ELF_NGREG (sizeof(struct user_pt_regs) / sizeof(elf_greg_t)) 123 #define ELF_CORE_COPY_REGS(dest, regs) \ 124 *(struct user_pt_regs *)&(dest) = (regs)->user_regs; 125 126 typedef elf_greg_t elf_gregset_t[ELF_NGREG]; 127 typedef struct user_fpsimd_state elf_fpregset_t; 128 129 /* 130 * When the program starts, a1 contains a pointer to a function to be 131 * registered with atexit, as per the SVR4 ABI. A value of 0 means we have no 132 * such handler. 133 */ 134 #define ELF_PLAT_INIT(_r, load_addr) (_r)->regs[0] = 0 135 136 #define SET_PERSONALITY(ex) \ 137 ({ \ 138 clear_thread_flag(TIF_32BIT); \ 139 current->personality &= ~READ_IMPLIES_EXEC; \ 140 }) 141 142 /* update AT_VECTOR_SIZE_ARCH if the number of NEW_AUX_ENT entries changes */ 143 #define ARCH_DLINFO \ 144 do { \ 145 NEW_AUX_ENT(AT_SYSINFO_EHDR, \ 146 (elf_addr_t)current->mm->context.vdso); \ 147 \ 148 /* \ 149 * Should always be nonzero unless there's a kernel bug. \ 150 * If we haven't determined a sensible value to give to \ 151 * userspace, omit the entry: \ 152 */ \ 153 if (likely(signal_minsigstksz)) \ 154 NEW_AUX_ENT(AT_MINSIGSTKSZ, signal_minsigstksz); \ 155 else \ 156 NEW_AUX_ENT(AT_IGNORE, 0); \ 157 } while (0) 158 159 #define ARCH_HAS_SETUP_ADDITIONAL_PAGES 160 struct linux_binprm; 161 extern int arch_setup_additional_pages(struct linux_binprm *bprm, 162 int uses_interp); 163 164 /* 1GB of VA */ 165 #ifdef CONFIG_COMPAT 166 #define STACK_RND_MASK (test_thread_flag(TIF_32BIT) ? \ 167 0x7ff >> (PAGE_SHIFT - 12) : \ 168 0x3ffff >> (PAGE_SHIFT - 12)) 169 #else 170 #define STACK_RND_MASK (0x3ffff >> (PAGE_SHIFT - 12)) 171 #endif 172 173 #ifdef __AARCH64EB__ 174 #define COMPAT_ELF_PLATFORM ("v8b") 175 #else 176 #define COMPAT_ELF_PLATFORM ("v8l") 177 #endif 178 179 #ifdef CONFIG_COMPAT 180 181 /* PIE load location for compat arm. Must match ARM ELF_ET_DYN_BASE. */ 182 #define COMPAT_ELF_ET_DYN_BASE 0x000400000UL 183 184 /* AArch32 registers. */ 185 #define COMPAT_ELF_NGREG 18 186 typedef unsigned int compat_elf_greg_t; 187 typedef compat_elf_greg_t compat_elf_gregset_t[COMPAT_ELF_NGREG]; 188 189 /* AArch32 EABI. */ 190 #define EF_ARM_EABI_MASK 0xff000000 191 #define compat_elf_check_arch(x) (system_supports_32bit_el0() && \ 192 ((x)->e_machine == EM_ARM) && \ 193 ((x)->e_flags & EF_ARM_EABI_MASK)) 194 195 #define compat_start_thread compat_start_thread 196 /* 197 * Unlike the native SET_PERSONALITY macro, the compat version maintains 198 * READ_IMPLIES_EXEC across an execve() since this is the behaviour on 199 * arch/arm/. 200 */ 201 #define COMPAT_SET_PERSONALITY(ex) \ 202 ({ \ 203 set_thread_flag(TIF_32BIT); \ 204 }) 205 #ifdef CONFIG_COMPAT_VDSO 206 #define COMPAT_ARCH_DLINFO \ 207 do { \ 208 /* \ 209 * Note that we use Elf64_Off instead of elf_addr_t because \ 210 * elf_addr_t in compat is defined as Elf32_Addr and casting \ 211 * current->mm->context.vdso to it triggers a cast warning of \ 212 * cast from pointer to integer of different size. \ 213 */ \ 214 NEW_AUX_ENT(AT_SYSINFO_EHDR, \ 215 (Elf64_Off)current->mm->context.vdso); \ 216 } while (0) 217 #else 218 #define COMPAT_ARCH_DLINFO 219 #endif 220 extern int aarch32_setup_additional_pages(struct linux_binprm *bprm, 221 int uses_interp); 222 #define compat_arch_setup_additional_pages \ 223 aarch32_setup_additional_pages 224 225 #endif /* CONFIG_COMPAT */ 226 227 #endif /* !__ASSEMBLY__ */ 228 229 #endif 230