blob 89293a55 (8014B) - Raw
1 /* ===-- assembly.h - libUnwind assembler support macros -------------------=== 2 * 3 * Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 * See https://llvm.org/LICENSE.txt for license information. 5 * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 * 7 * ===----------------------------------------------------------------------=== 8 * 9 * This file defines macros for use in libUnwind assembler source. 10 * This file is not part of the interface of this library. 11 * 12 * ===----------------------------------------------------------------------=== 13 */ 14 15 #ifndef UNWIND_ASSEMBLY_H 16 #define UNWIND_ASSEMBLY_H 17 18 #if defined(__linux__) && defined(__CET__) 19 #include <cet.h> 20 #define _LIBUNWIND_CET_ENDBR _CET_ENDBR 21 #else 22 #define _LIBUNWIND_CET_ENDBR 23 #endif 24 25 #if defined(__powerpc64__) 26 #define SEPARATOR ; 27 #define PPC64_OFFS_SRR0 0 28 #define PPC64_OFFS_CR 272 29 #define PPC64_OFFS_XER 280 30 #define PPC64_OFFS_LR 288 31 #define PPC64_OFFS_CTR 296 32 #define PPC64_OFFS_VRSAVE 304 33 #define PPC64_OFFS_FP 312 34 #define PPC64_OFFS_V 824 35 #elif defined(__APPLE__) && defined(__aarch64__) 36 #define SEPARATOR %% 37 #elif defined(__riscv) 38 # define RISCV_ISIZE (__riscv_xlen / 8) 39 # define RISCV_FOFFSET (RISCV_ISIZE * 32) 40 # if defined(__riscv_flen) 41 # define RISCV_FSIZE (__riscv_flen / 8) 42 # endif 43 44 # if __riscv_xlen == 64 45 # define ILOAD ld 46 # define ISTORE sd 47 # elif __riscv_xlen == 32 48 # define ILOAD lw 49 # define ISTORE sw 50 # else 51 # error "Unsupported __riscv_xlen" 52 # endif 53 54 # if defined(__riscv_flen) 55 # if __riscv_flen == 64 56 # define FLOAD fld 57 # define FSTORE fsd 58 # elif __riscv_flen == 32 59 # define FLOAD flw 60 # define FSTORE fsw 61 # else 62 # error "Unsupported __riscv_flen" 63 # endif 64 # endif 65 # define SEPARATOR ; 66 #else 67 #define SEPARATOR ; 68 #endif 69 70 #if defined(__powerpc64__) && (!defined(_CALL_ELF) || _CALL_ELF == 1) 71 #define PPC64_OPD1 .section .opd,"aw",@progbits SEPARATOR 72 #define PPC64_OPD2 SEPARATOR \ 73 .p2align 3 SEPARATOR \ 74 .quad .Lfunc_begin0 SEPARATOR \ 75 .quad .TOC.@tocbase SEPARATOR \ 76 .quad 0 SEPARATOR \ 77 .text SEPARATOR \ 78 .Lfunc_begin0: 79 #else 80 #define PPC64_OPD1 81 #define PPC64_OPD2 82 #endif 83 84 #if defined(__aarch64__) && defined(__ARM_FEATURE_BTI_DEFAULT) 85 .pushsection ".note.gnu.property", "a" SEPARATOR \ 86 .balign 8 SEPARATOR \ 87 .long 4 SEPARATOR \ 88 .long 0x10 SEPARATOR \ 89 .long 0x5 SEPARATOR \ 90 .asciz "GNU" SEPARATOR \ 91 .long 0xc0000000 SEPARATOR /* GNU_PROPERTY_AARCH64_FEATURE_1_AND */ \ 92 .long 4 SEPARATOR \ 93 .long 3 SEPARATOR /* GNU_PROPERTY_AARCH64_FEATURE_1_BTI AND */ \ 94 /* GNU_PROPERTY_AARCH64_FEATURE_1_PAC */ \ 95 .long 0 SEPARATOR \ 96 .popsection SEPARATOR 97 #define AARCH64_BTI bti c 98 #else 99 #define AARCH64_BTI 100 #endif 101 102 #if !defined(__aarch64__) 103 #ifdef __ARM_FEATURE_PAC_DEFAULT 104 .eabi_attribute Tag_PAC_extension, 2 105 .eabi_attribute Tag_PACRET_use, 1 106 #endif 107 #ifdef __ARM_FEATURE_BTI_DEFAULT 108 .eabi_attribute Tag_BTI_extension, 1 109 .eabi_attribute Tag_BTI_use, 1 110 #endif 111 #endif 112 113 #define GLUE2(a, b) a ## b 114 #define GLUE(a, b) GLUE2(a, b) 115 #define SYMBOL_NAME(name) GLUE(__USER_LABEL_PREFIX__, name) 116 117 #if defined(__APPLE__) 118 119 #define SYMBOL_IS_FUNC(name) 120 #define HIDDEN_SYMBOL(name) .private_extern name 121 #if defined(_LIBUNWIND_HIDE_SYMBOLS) 122 #define EXPORT_SYMBOL(name) HIDDEN_SYMBOL(name) 123 #else 124 #define EXPORT_SYMBOL(name) 125 #endif 126 #define WEAK_ALIAS(name, aliasname) \ 127 .globl SYMBOL_NAME(aliasname) SEPARATOR \ 128 EXPORT_SYMBOL(SYMBOL_NAME(aliasname)) SEPARATOR \ 129 SYMBOL_NAME(aliasname) = SYMBOL_NAME(name) 130 131 #define NO_EXEC_STACK_DIRECTIVE 132 133 #elif defined(__ELF__) 134 135 #if defined(__arm__) 136 #define SYMBOL_IS_FUNC(name) .type name,%function 137 #else 138 #define SYMBOL_IS_FUNC(name) .type name,@function 139 #endif 140 #define HIDDEN_SYMBOL(name) .hidden name 141 #if defined(_LIBUNWIND_HIDE_SYMBOLS) 142 #define EXPORT_SYMBOL(name) HIDDEN_SYMBOL(name) 143 #else 144 #define EXPORT_SYMBOL(name) 145 #endif 146 #define WEAK_SYMBOL(name) .weak name 147 148 #if defined(__hexagon__) 149 #define WEAK_ALIAS(name, aliasname) \ 150 EXPORT_SYMBOL(SYMBOL_NAME(aliasname)) SEPARATOR \ 151 WEAK_SYMBOL(SYMBOL_NAME(aliasname)) SEPARATOR \ 152 .equiv SYMBOL_NAME(aliasname), SYMBOL_NAME(name) 153 #else 154 #define WEAK_ALIAS(name, aliasname) \ 155 EXPORT_SYMBOL(SYMBOL_NAME(aliasname)) SEPARATOR \ 156 WEAK_SYMBOL(SYMBOL_NAME(aliasname)) SEPARATOR \ 157 SYMBOL_NAME(aliasname) = SYMBOL_NAME(name) 158 #endif 159 160 #if defined(__GNU__) || defined(__FreeBSD__) || defined(__Fuchsia__) || \ 161 defined(__linux__) 162 #define NO_EXEC_STACK_DIRECTIVE .section .note.GNU-stack,"",%progbits 163 #else 164 #define NO_EXEC_STACK_DIRECTIVE 165 #endif 166 167 #elif defined(_WIN32) 168 169 #define SYMBOL_IS_FUNC(name) \ 170 .def name SEPARATOR \ 171 .scl 2 SEPARATOR \ 172 .type 32 SEPARATOR \ 173 .endef 174 #define EXPORT_SYMBOL2(name) \ 175 .section .drectve,"yn" SEPARATOR \ 176 .ascii "-export:", #name, "\0" SEPARATOR \ 177 .text 178 #if defined(_LIBUNWIND_HIDE_SYMBOLS) 179 #define EXPORT_SYMBOL(name) 180 #else 181 #define EXPORT_SYMBOL(name) EXPORT_SYMBOL2(name) 182 #endif 183 #define HIDDEN_SYMBOL(name) 184 185 #if defined(__MINGW32__) 186 #define WEAK_ALIAS(name, aliasname) \ 187 .globl SYMBOL_NAME(aliasname) SEPARATOR \ 188 EXPORT_SYMBOL(aliasname) SEPARATOR \ 189 SYMBOL_NAME(aliasname) = SYMBOL_NAME(name) 190 #else 191 #define WEAK_ALIAS3(name, aliasname) \ 192 .section .drectve,"yn" SEPARATOR \ 193 .ascii "-alternatename:", #aliasname, "=", #name, "\0" SEPARATOR \ 194 .text 195 #define WEAK_ALIAS2(name, aliasname) \ 196 WEAK_ALIAS3(name, aliasname) 197 #define WEAK_ALIAS(name, aliasname) \ 198 EXPORT_SYMBOL(SYMBOL_NAME(aliasname)) SEPARATOR \ 199 WEAK_ALIAS2(SYMBOL_NAME(name), SYMBOL_NAME(aliasname)) 200 #endif 201 202 #define NO_EXEC_STACK_DIRECTIVE 203 204 #elif defined(__sparc__) 205 206 #else 207 208 #error Unsupported target 209 210 #endif 211 212 #define DEFINE_LIBUNWIND_FUNCTION(name) \ 213 .globl SYMBOL_NAME(name) SEPARATOR \ 214 HIDDEN_SYMBOL(SYMBOL_NAME(name)) SEPARATOR \ 215 SYMBOL_IS_FUNC(SYMBOL_NAME(name)) SEPARATOR \ 216 PPC64_OPD1 \ 217 SYMBOL_NAME(name): \ 218 PPC64_OPD2 \ 219 AARCH64_BTI 220 221 #if defined(__arm__) 222 #if !defined(__ARM_ARCH) 223 #define __ARM_ARCH 4 224 #endif 225 226 #if defined(__ARM_ARCH_4T__) || __ARM_ARCH >= 5 227 #define ARM_HAS_BX 228 #endif 229 230 #ifdef ARM_HAS_BX 231 #define JMP(r) bx r 232 #else 233 #define JMP(r) mov pc, r 234 #endif 235 #endif /* __arm__ */ 236 237 #if defined(__powerpc__) 238 #define PPC_LEFT_SHIFT(index) << (index) 239 #endif 240 241 #endif /* UNWIND_ASSEMBLY_H */