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(__powerpc64__) 19 #define SEPARATOR ; 20 #define PPC64_OFFS_SRR0 0 21 #define PPC64_OFFS_CR 272 22 #define PPC64_OFFS_XER 280 23 #define PPC64_OFFS_LR 288 24 #define PPC64_OFFS_CTR 296 25 #define PPC64_OFFS_VRSAVE 304 26 #define PPC64_OFFS_FP 312 27 #define PPC64_OFFS_V 824 28 #elif defined(__APPLE__) && defined(__aarch64__) 29 #define SEPARATOR %% 30 #else 31 #define SEPARATOR ; 32 #endif 33 34 #if defined(__powerpc64__) && (!defined(_CALL_ELF) || _CALL_ELF == 1) 35 #define PPC64_OPD1 .section .opd,"aw",@progbits SEPARATOR 36 #define PPC64_OPD2 SEPARATOR \ 37 .p2align 3 SEPARATOR \ 38 .quad .Lfunc_begin0 SEPARATOR \ 39 .quad .TOC.@tocbase SEPARATOR \ 40 .quad 0 SEPARATOR \ 41 .text SEPARATOR \ 42 .Lfunc_begin0: 43 #else 44 #define PPC64_OPD1 45 #define PPC64_OPD2 46 #endif 47 48 #if defined(__ARM_FEATURE_BTI_DEFAULT) 49 .pushsection ".note.gnu.property", "a" SEPARATOR \ 50 .balign 8 SEPARATOR \ 51 .long 4 SEPARATOR \ 52 .long 0x10 SEPARATOR \ 53 .long 0x5 SEPARATOR \ 54 .asciz "GNU" SEPARATOR \ 55 .long 0xc0000000 SEPARATOR /* GNU_PROPERTY_AARCH64_FEATURE_1_AND */ \ 56 .long 4 SEPARATOR \ 57 .long 3 SEPARATOR /* GNU_PROPERTY_AARCH64_FEATURE_1_BTI AND */ \ 58 /* GNU_PROPERTY_AARCH64_FEATURE_1_PAC */ \ 59 .long 0 SEPARATOR \ 60 .popsection SEPARATOR 61 #define AARCH64_BTI bti c 62 #else 63 #define AARCH64_BTI 64 #endif 65 66 #define GLUE2(a, b) a ## b 67 #define GLUE(a, b) GLUE2(a, b) 68 #define SYMBOL_NAME(name) GLUE(__USER_LABEL_PREFIX__, name) 69 70 #if defined(__APPLE__) 71 72 #define SYMBOL_IS_FUNC(name) 73 #define EXPORT_SYMBOL(name) 74 #define HIDDEN_SYMBOL(name) .private_extern name 75 #define WEAK_SYMBOL(name) .weak_reference name 76 #define WEAK_ALIAS(name, aliasname) \ 77 .globl SYMBOL_NAME(aliasname) SEPARATOR \ 78 WEAK_SYMBOL(aliasname) SEPARATOR \ 79 SYMBOL_NAME(aliasname) = SYMBOL_NAME(name) 80 81 #define NO_EXEC_STACK_DIRECTIVE 82 83 #elif defined(__ELF__) 84 85 #if defined(__arm__) 86 #define SYMBOL_IS_FUNC(name) .type name,%function 87 #else 88 #define SYMBOL_IS_FUNC(name) .type name,@function 89 #endif 90 #define EXPORT_SYMBOL(name) 91 #define HIDDEN_SYMBOL(name) .hidden name 92 #define WEAK_SYMBOL(name) .weak name 93 94 #if defined(__hexagon__) 95 #define WEAK_ALIAS(name, aliasname) \ 96 WEAK_SYMBOL(aliasname) SEPARATOR \ 97 .equiv SYMBOL_NAME(aliasname), SYMBOL_NAME(name) 98 #else 99 #define WEAK_ALIAS(name, aliasname) \ 100 WEAK_SYMBOL(aliasname) SEPARATOR \ 101 SYMBOL_NAME(aliasname) = SYMBOL_NAME(name) 102 #endif 103 104 #if defined(__GNU__) || defined(__FreeBSD__) || defined(__Fuchsia__) || \ 105 defined(__linux__) 106 #define NO_EXEC_STACK_DIRECTIVE .section .note.GNU-stack,"",%progbits 107 #else 108 #define NO_EXEC_STACK_DIRECTIVE 109 #endif 110 111 #elif defined(_WIN32) 112 113 #define SYMBOL_IS_FUNC(name) \ 114 .def name SEPARATOR \ 115 .scl 2 SEPARATOR \ 116 .type 32 SEPARATOR \ 117 .endef 118 #define EXPORT_SYMBOL2(name) \ 119 .section .drectve,"yn" SEPARATOR \ 120 .ascii "-export:", #name, "\0" SEPARATOR \ 121 .text 122 #if defined(_LIBUNWIND_DISABLE_VISIBILITY_ANNOTATIONS) 123 #define EXPORT_SYMBOL(name) 124 #else 125 #define EXPORT_SYMBOL(name) EXPORT_SYMBOL2(name) 126 #endif 127 #define HIDDEN_SYMBOL(name) 128 129 #if defined(__MINGW32__) 130 #define WEAK_ALIAS(name, aliasname) \ 131 .globl SYMBOL_NAME(aliasname) SEPARATOR \ 132 EXPORT_SYMBOL(aliasname) SEPARATOR \ 133 SYMBOL_NAME(aliasname) = SYMBOL_NAME(name) 134 #else 135 #define WEAK_ALIAS3(name, aliasname) \ 136 .section .drectve,"yn" SEPARATOR \ 137 .ascii "-alternatename:", #aliasname, "=", #name, "\0" SEPARATOR \ 138 .text 139 #define WEAK_ALIAS2(name, aliasname) \ 140 WEAK_ALIAS3(name, aliasname) 141 #define WEAK_ALIAS(name, aliasname) \ 142 EXPORT_SYMBOL(SYMBOL_NAME(aliasname)) SEPARATOR \ 143 WEAK_ALIAS2(SYMBOL_NAME(name), SYMBOL_NAME(aliasname)) 144 #endif 145 146 #define NO_EXEC_STACK_DIRECTIVE 147 148 #elif defined(__sparc__) 149 150 #else 151 152 #error Unsupported target 153 154 #endif 155 156 #define DEFINE_LIBUNWIND_FUNCTION(name) \ 157 .globl SYMBOL_NAME(name) SEPARATOR \ 158 HIDDEN_SYMBOL(SYMBOL_NAME(name)) SEPARATOR \ 159 SYMBOL_IS_FUNC(SYMBOL_NAME(name)) SEPARATOR \ 160 PPC64_OPD1 \ 161 SYMBOL_NAME(name): \ 162 PPC64_OPD2 \ 163 AARCH64_BTI 164 165 #if defined(__arm__) 166 #if !defined(__ARM_ARCH) 167 #define __ARM_ARCH 4 168 #endif 169 170 #if defined(__ARM_ARCH_4T__) || __ARM_ARCH >= 5 171 #define ARM_HAS_BX 172 #endif 173 174 #ifdef ARM_HAS_BX 175 #define JMP(r) bx r 176 #else 177 #define JMP(r) mov pc, r 178 #endif 179 #endif /* __arm__ */ 180 181 #endif /* UNWIND_ASSEMBLY_H */ 182