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 #ifdef _ARCH_PWR8 29 #define PPC64_HAS_VMX 30 #endif 31 #elif defined(__APPLE__) && defined(__aarch64__) 32 #define SEPARATOR %% 33 #else 34 #define SEPARATOR ; 35 #endif 36 37 #if defined(__powerpc64__) && (!defined(_CALL_ELF) || _CALL_ELF == 1) 38 #define PPC64_OPD1 .section .opd,"aw",@progbits SEPARATOR 39 #define PPC64_OPD2 SEPARATOR \ 40 .p2align 3 SEPARATOR \ 41 .quad .Lfunc_begin0 SEPARATOR \ 42 .quad .TOC.@tocbase SEPARATOR \ 43 .quad 0 SEPARATOR \ 44 .text SEPARATOR \ 45 .Lfunc_begin0: 46 #else 47 #define PPC64_OPD1 48 #define PPC64_OPD2 49 #endif 50 51 #define GLUE2(a, b) a ## b 52 #define GLUE(a, b) GLUE2(a, b) 53 #define SYMBOL_NAME(name) GLUE(__USER_LABEL_PREFIX__, name) 54 55 #if defined(__APPLE__) 56 57 #define SYMBOL_IS_FUNC(name) 58 #define EXPORT_SYMBOL(name) 59 #define HIDDEN_SYMBOL(name) .private_extern name 60 #define WEAK_SYMBOL(name) .weak_reference name 61 #define WEAK_ALIAS(name, aliasname) \ 62 .globl SYMBOL_NAME(aliasname) SEPARATOR \ 63 WEAK_SYMBOL(aliasname) SEPARATOR \ 64 SYMBOL_NAME(aliasname) = SYMBOL_NAME(name) 65 66 #define NO_EXEC_STACK_DIRECTIVE 67 68 #elif defined(__ELF__) 69 70 #if defined(__arm__) 71 #define SYMBOL_IS_FUNC(name) .type name,%function 72 #else 73 #define SYMBOL_IS_FUNC(name) .type name,@function 74 #endif 75 #define EXPORT_SYMBOL(name) 76 #define HIDDEN_SYMBOL(name) .hidden name 77 #define WEAK_SYMBOL(name) .weak name 78 79 #if defined(__hexagon__) 80 #define WEAK_ALIAS(name, aliasname) \ 81 WEAK_SYMBOL(aliasname) SEPARATOR \ 82 .equiv SYMBOL_NAME(aliasname), SYMBOL_NAME(name) 83 #else 84 #define WEAK_ALIAS(name, aliasname) \ 85 WEAK_SYMBOL(aliasname) SEPARATOR \ 86 SYMBOL_NAME(aliasname) = SYMBOL_NAME(name) 87 #endif 88 89 #if defined(__GNU__) || defined(__FreeBSD__) || defined(__Fuchsia__) || \ 90 defined(__linux__) 91 #define NO_EXEC_STACK_DIRECTIVE .section .note.GNU-stack,"",%progbits 92 #else 93 #define NO_EXEC_STACK_DIRECTIVE 94 #endif 95 96 #elif defined(_WIN32) 97 98 #define SYMBOL_IS_FUNC(name) \ 99 .def name SEPARATOR \ 100 .scl 2 SEPARATOR \ 101 .type 32 SEPARATOR \ 102 .endef 103 #define EXPORT_SYMBOL2(name) \ 104 .section .drectve,"yn" SEPARATOR \ 105 .ascii "-export:", #name, "\0" SEPARATOR \ 106 .text 107 #if defined(_LIBUNWIND_DISABLE_VISIBILITY_ANNOTATIONS) 108 #define EXPORT_SYMBOL(name) 109 #else 110 #define EXPORT_SYMBOL(name) EXPORT_SYMBOL2(name) 111 #endif 112 #define HIDDEN_SYMBOL(name) 113 114 #if defined(__MINGW32__) 115 #define WEAK_ALIAS(name, aliasname) \ 116 .globl SYMBOL_NAME(aliasname) SEPARATOR \ 117 EXPORT_SYMBOL(aliasname) SEPARATOR \ 118 SYMBOL_NAME(aliasname) = SYMBOL_NAME(name) 119 #else 120 #define WEAK_ALIAS3(name, aliasname) \ 121 .section .drectve,"yn" SEPARATOR \ 122 .ascii "-alternatename:", #aliasname, "=", #name, "\0" SEPARATOR \ 123 .text 124 #define WEAK_ALIAS2(name, aliasname) \ 125 WEAK_ALIAS3(name, aliasname) 126 #define WEAK_ALIAS(name, aliasname) \ 127 EXPORT_SYMBOL(SYMBOL_NAME(aliasname)) SEPARATOR \ 128 WEAK_ALIAS2(SYMBOL_NAME(name), SYMBOL_NAME(aliasname)) 129 #endif 130 131 #define NO_EXEC_STACK_DIRECTIVE 132 133 #elif defined(__sparc__) 134 135 #else 136 137 #error Unsupported target 138 139 #endif 140 141 #define DEFINE_LIBUNWIND_FUNCTION(name) \ 142 .globl SYMBOL_NAME(name) SEPARATOR \ 143 HIDDEN_SYMBOL(SYMBOL_NAME(name)) SEPARATOR \ 144 SYMBOL_IS_FUNC(SYMBOL_NAME(name)) SEPARATOR \ 145 PPC64_OPD1 \ 146 SYMBOL_NAME(name): \ 147 PPC64_OPD2 148 149 #if defined(__arm__) 150 #if !defined(__ARM_ARCH) 151 #define __ARM_ARCH 4 152 #endif 153 154 #if defined(__ARM_ARCH_4T__) || __ARM_ARCH >= 5 155 #define ARM_HAS_BX 156 #endif 157 158 #ifdef ARM_HAS_BX 159 #define JMP(r) bx r 160 #else 161 #define JMP(r) mov pc, r 162 #endif 163 #endif /* __arm__ */ 164 165 #endif /* UNWIND_ASSEMBLY_H */ 166