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 <uapi/linux/elf.h> 118 #include <linux/bug.h> 119 #include <linux/errno.h> 120 #include <linux/fs.h> 121 #include <linux/types.h> 122 #include <asm/processor.h> /* for signal_minsigstksz, used by ARCH_DLINFO */ 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_thread_flag(TIF_32BIT); \ 143 current->personality &= ~READ_IMPLIES_EXEC; \ 144 }) 145 146 /* update AT_VECTOR_SIZE_ARCH if the number of NEW_AUX_ENT entries changes */ 147 #define ARCH_DLINFO \ 148 do { \ 149 NEW_AUX_ENT(AT_SYSINFO_EHDR, \ 150 (elf_addr_t)current->mm->context.vdso); \ 151 \ 152 /* \ 153 * Should always be nonzero unless there's a kernel bug. \ 154 * If we haven't determined a sensible value to give to \ 155 * userspace, omit the entry: \ 156 */ \ 157 if (likely(signal_minsigstksz)) \ 158 NEW_AUX_ENT(AT_MINSIGSTKSZ, signal_minsigstksz); \ 159 else \ 160 NEW_AUX_ENT(AT_IGNORE, 0); \ 161 } while (0) 162 163 #define ARCH_HAS_SETUP_ADDITIONAL_PAGES 164 struct linux_binprm; 165 extern int arch_setup_additional_pages(struct linux_binprm *bprm, 166 int uses_interp); 167 168 /* 1GB of VA */ 169 #ifdef CONFIG_COMPAT 170 #define STACK_RND_MASK (test_thread_flag(TIF_32BIT) ? \ 171 0x7ff >> (PAGE_SHIFT - 12) : \ 172 0x3ffff >> (PAGE_SHIFT - 12)) 173 #else 174 #define STACK_RND_MASK (0x3ffff >> (PAGE_SHIFT - 12)) 175 #endif 176 177 #ifdef __AARCH64EB__ 178 #define COMPAT_ELF_PLATFORM ("v8b") 179 #else 180 #define COMPAT_ELF_PLATFORM ("v8l") 181 #endif 182 183 #ifdef CONFIG_COMPAT 184 185 /* PIE load location for compat arm. Must match ARM ELF_ET_DYN_BASE. */ 186 #define COMPAT_ELF_ET_DYN_BASE 0x000400000UL 187 188 /* AArch32 registers. */ 189 #define COMPAT_ELF_NGREG 18 190 typedef unsigned int compat_elf_greg_t; 191 typedef compat_elf_greg_t compat_elf_gregset_t[COMPAT_ELF_NGREG]; 192 193 /* AArch32 EABI. */ 194 #define EF_ARM_EABI_MASK 0xff000000 195 #define compat_elf_check_arch(x) (system_supports_32bit_el0() && \ 196 ((x)->e_machine == EM_ARM) && \ 197 ((x)->e_flags & EF_ARM_EABI_MASK)) 198 199 #define compat_start_thread compat_start_thread 200 /* 201 * Unlike the native SET_PERSONALITY macro, the compat version maintains 202 * READ_IMPLIES_EXEC across an execve() since this is the behaviour on 203 * arch/arm/. 204 */ 205 #define COMPAT_SET_PERSONALITY(ex) \ 206 ({ \ 207 set_thread_flag(TIF_32BIT); \ 208 }) 209 #ifdef CONFIG_COMPAT_VDSO 210 #define COMPAT_ARCH_DLINFO \ 211 do { \ 212 /* \ 213 * Note that we use Elf64_Off instead of elf_addr_t because \ 214 * elf_addr_t in compat is defined as Elf32_Addr and casting \ 215 * current->mm->context.vdso to it triggers a cast warning of \ 216 * cast from pointer to integer of different size. \ 217 */ \ 218 NEW_AUX_ENT(AT_SYSINFO_EHDR, \ 219 (Elf64_Off)current->mm->context.vdso); \ 220 } while (0) 221 #else 222 #define COMPAT_ARCH_DLINFO 223 #endif 224 extern int aarch32_setup_additional_pages(struct linux_binprm *bprm, 225 int uses_interp); 226 #define compat_arch_setup_additional_pages \ 227 aarch32_setup_additional_pages 228 229 #endif /* CONFIG_COMPAT */ 230 231 struct arch_elf_state { 232 int flags; 233 }; 234 235 #define ARM64_ELF_BTI (1 << 0) 236 237 #define INIT_ARCH_ELF_STATE { \ 238 .flags = 0, \ 239 } 240 241 static inline int arch_parse_elf_property(u32 type, const void *data, 242 size_t datasz, bool compat, 243 struct arch_elf_state *arch) 244 { 245 /* No known properties for AArch32 yet */ 246 if (IS_ENABLED(CONFIG_COMPAT) && compat) 247 return 0; 248 249 if (type == GNU_PROPERTY_AARCH64_FEATURE_1_AND) { 250 const u32 *p = data; 251 252 if (datasz != sizeof(*p)) 253 return -ENOEXEC; 254 255 if (system_supports_bti() && 256 (*p & GNU_PROPERTY_AARCH64_FEATURE_1_BTI)) 257 arch->flags |= ARM64_ELF_BTI; 258 } 259 260 return 0; 261 } 262 263 static inline int arch_elf_pt_proc(void *ehdr, void *phdr, 264 struct file *f, bool is_interp, 265 struct arch_elf_state *state) 266 { 267 return 0; 268 } 269 270 static inline int arch_check_elf(void *ehdr, bool has_interp, 271 void *interp_ehdr, 272 struct arch_elf_state *state) 273 { 274 return 0; 275 } 276 277 #endif /* !__ASSEMBLY__ */ 278 279 #endif 280