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-none | 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 compat_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 <uapi/linux/elf.h> 139 #include <linux/bug.h> 140 #include <linux/errno.h> 141 #include <linux/fs.h> 142 #include <linux/types.h> 143 #include <asm/processor.h> /* for signal_minsigstksz, used by ARCH_DLINFO */ 144 145 typedef unsigned long elf_greg_t; 146 147 #define ELF_NGREG (sizeof(struct user_pt_regs) / sizeof(elf_greg_t)) 148 #define ELF_CORE_COPY_REGS(dest, regs) \ 149 *(struct user_pt_regs *)&(dest) = (regs)->user_regs; 150 151 typedef elf_greg_t elf_gregset_t[ELF_NGREG]; 152 typedef struct user_fpsimd_state elf_fpregset_t; 153 154 /* 155 * When the program starts, a1 contains a pointer to a function to be 156 * registered with atexit, as per the SVR4 ABI. A value of 0 means we have no 157 * such handler. 158 */ 159 #define ELF_PLAT_INIT(_r, load_addr) (_r)->regs[0] = 0 160 161 #define SET_PERSONALITY(ex) \ 162 ({ \ 163 clear_thread_flag(TIF_32BIT); \ 164 current->personality &= ~READ_IMPLIES_EXEC; \ 165 }) 166 167 /* update AT_VECTOR_SIZE_ARCH if the number of NEW_AUX_ENT entries changes */ 168 #define ARCH_DLINFO \ 169 do { \ 170 NEW_AUX_ENT(AT_SYSINFO_EHDR, \ 171 (elf_addr_t)current->mm->context.vdso); \ 172 \ 173 /* \ 174 * Should always be nonzero unless there's a kernel bug. \ 175 * If we haven't determined a sensible value to give to \ 176 * userspace, omit the entry: \ 177 */ \ 178 if (likely(signal_minsigstksz)) \ 179 NEW_AUX_ENT(AT_MINSIGSTKSZ, signal_minsigstksz); \ 180 else \ 181 NEW_AUX_ENT(AT_IGNORE, 0); \ 182 } while (0) 183 184 #define ARCH_HAS_SETUP_ADDITIONAL_PAGES 185 struct linux_binprm; 186 extern int arch_setup_additional_pages(struct linux_binprm *bprm, 187 int uses_interp); 188 189 /* 1GB of VA */ 190 #ifdef CONFIG_COMPAT 191 #define STACK_RND_MASK (test_thread_flag(TIF_32BIT) ? \ 192 0x7ff >> (PAGE_SHIFT - 12) : \ 193 0x3ffff >> (PAGE_SHIFT - 12)) 194 #else 195 #define STACK_RND_MASK (0x3ffff >> (PAGE_SHIFT - 12)) 196 #endif 197 198 #ifdef __AARCH64EB__ 199 #define COMPAT_ELF_PLATFORM ("v8b") 200 #else 201 #define COMPAT_ELF_PLATFORM ("v8l") 202 #endif 203 204 #ifdef CONFIG_COMPAT 205 206 /* PIE load location for compat arm. Must match ARM ELF_ET_DYN_BASE. */ 207 #define COMPAT_ELF_ET_DYN_BASE 0x000400000UL 208 209 /* AArch32 registers. */ 210 #define COMPAT_ELF_NGREG 18 211 typedef unsigned int compat_elf_greg_t; 212 typedef compat_elf_greg_t compat_elf_gregset_t[COMPAT_ELF_NGREG]; 213 214 /* AArch32 EABI. */ 215 #define EF_ARM_EABI_MASK 0xff000000 216 int compat_elf_check_arch(const struct elf32_hdr *); 217 #define compat_elf_check_arch compat_elf_check_arch 218 #define compat_start_thread compat_start_thread 219 /* 220 * Unlike the native SET_PERSONALITY macro, the compat version maintains 221 * READ_IMPLIES_EXEC across an execve() since this is the behaviour on 222 * arch/arm/. 223 */ 224 #define COMPAT_SET_PERSONALITY(ex) \ 225 ({ \ 226 set_thread_flag(TIF_32BIT); \ 227 }) 228 #ifdef CONFIG_COMPAT_VDSO 229 #define COMPAT_ARCH_DLINFO \ 230 do { \ 231 /* \ 232 * Note that we use Elf64_Off instead of elf_addr_t because \ 233 * elf_addr_t in compat is defined as Elf32_Addr and casting \ 234 * current->mm->context.vdso to it triggers a cast warning of \ 235 * cast from pointer to integer of different size. \ 236 */ \ 237 NEW_AUX_ENT(AT_SYSINFO_EHDR, \ 238 (Elf64_Off)current->mm->context.vdso); \ 239 } while (0) 240 #else 241 #define COMPAT_ARCH_DLINFO 242 #endif 243 extern int aarch32_setup_additional_pages(struct linux_binprm *bprm, 244 int uses_interp); 245 #define compat_arch_setup_additional_pages \ 246 aarch32_setup_additional_pages 247 248 #endif /* CONFIG_COMPAT */ 249 250 struct arch_elf_state { 251 int flags; 252 }; 253 254 #define ARM64_ELF_BTI (1 << 0) 255 256 #define INIT_ARCH_ELF_STATE { \ 257 .flags = 0, \ 258 } 259 260 static inline int arch_parse_elf_property(u32 type, const void *data, 261 size_t datasz, bool compat, 262 struct arch_elf_state *arch) 263 { 264 /* No known properties for AArch32 yet */ 265 if (IS_ENABLED(CONFIG_COMPAT) && compat) 266 return 0; 267 268 if (type == GNU_PROPERTY_AARCH64_FEATURE_1_AND) { 269 const u32 *p = data; 270 271 if (datasz != sizeof(*p)) 272 return -ENOEXEC; 273 274 if (system_supports_bti() && 275 (*p & GNU_PROPERTY_AARCH64_FEATURE_1_BTI)) 276 arch->flags |= ARM64_ELF_BTI; 277 } 278 279 return 0; 280 } 281 282 static inline int arch_elf_pt_proc(void *ehdr, void *phdr, 283 struct file *f, bool is_interp, 284 struct arch_elf_state *state) 285 { 286 return 0; 287 } 288 289 static inline int arch_check_elf(void *ehdr, bool has_interp, 290 void *interp_ehdr, 291 struct arch_elf_state *state) 292 { 293 return 0; 294 } 295 296 #endif /* !__ASSEMBLY__ */ 297 298 #endif 299