1 //===-- assembly.h - compiler-rt 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 compiler-rt assembler source. 10 // This file is not part of the interface of this library. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #ifndef COMPILERRT_ASSEMBLY_H 15 #define COMPILERRT_ASSEMBLY_H 16 17 #if defined(__POWERPC__) || defined(__powerpc__) || defined(__ppc__) 18 #define SEPARATOR @ 19 #else 20 #define SEPARATOR ; 21 #endif 22 23 #if defined(__APPLE__) 24 #define HIDDEN(name) .private_extern name 25 #define LOCAL_LABEL(name) L_##name 26 // tell linker it can break up file at label boundaries 27 #define FILE_LEVEL_DIRECTIVE .subsections_via_symbols 28 #define SYMBOL_IS_FUNC(name) 29 #define CONST_SECTION .const 30 31 #define NO_EXEC_STACK_DIRECTIVE 32 33 #elif defined(__ELF__) 34 35 #define HIDDEN(name) .hidden name 36 #define LOCAL_LABEL(name) .L_##name 37 #define FILE_LEVEL_DIRECTIVE 38 #if defined(__arm__) 39 #define SYMBOL_IS_FUNC(name) .type name,%function 40 #else 41 #define SYMBOL_IS_FUNC(name) .type name,@function 42 #endif 43 #define CONST_SECTION .section .rodata 44 45 #if defined(__GNU__) || defined(__FreeBSD__) || defined(__Fuchsia__) || \ 46 defined(__linux__) 47 #define NO_EXEC_STACK_DIRECTIVE .section .note.GNU-stack,"",%progbits 48 #else 49 #define NO_EXEC_STACK_DIRECTIVE 50 #endif 51 52 #else // !__APPLE__ && !__ELF__ 53 54 #define HIDDEN(name) 55 #define LOCAL_LABEL(name) .L ## name 56 #define FILE_LEVEL_DIRECTIVE 57 #define SYMBOL_IS_FUNC(name) \ 58 .def name SEPARATOR \ 59 .scl 2 SEPARATOR \ 60 .type 32 SEPARATOR \ 61 .endef 62 #define CONST_SECTION .section .rdata,"rd" 63 64 #define NO_EXEC_STACK_DIRECTIVE 65 66 #endif 67 68 #if defined(__arm__) 69 70 // Determine actual [ARM][THUMB[1][2]] ISA using compiler predefined macros: 71 // - for '-mthumb -march=armv6' compiler defines '__thumb__' 72 // - for '-mthumb -march=armv7' compiler defines '__thumb__' and '__thumb2__' 73 #if defined(__thumb2__) || defined(__thumb__) 74 #define DEFINE_CODE_STATE .thumb SEPARATOR 75 #define DECLARE_FUNC_ENCODING .thumb_func SEPARATOR 76 #if defined(__thumb2__) 77 #define USE_THUMB_2 78 #define IT(cond) it cond 79 #define ITT(cond) itt cond 80 #define ITE(cond) ite cond 81 #else 82 #define USE_THUMB_1 83 #define IT(cond) 84 #define ITT(cond) 85 #define ITE(cond) 86 #endif // defined(__thumb__2) 87 #else // !defined(__thumb2__) && !defined(__thumb__) 88 #define DEFINE_CODE_STATE .arm SEPARATOR 89 #define DECLARE_FUNC_ENCODING 90 #define IT(cond) 91 #define ITT(cond) 92 #define ITE(cond) 93 #endif 94 95 #if defined(USE_THUMB_1) && defined(USE_THUMB_2) 96 #error "USE_THUMB_1 and USE_THUMB_2 can't be defined together." 97 #endif 98 99 #if defined(__ARM_ARCH_4T__) || __ARM_ARCH >= 5 100 #define ARM_HAS_BX 101 #endif 102 #if !defined(__ARM_FEATURE_CLZ) && !defined(USE_THUMB_1) && \ 103 (__ARM_ARCH >= 6 || (__ARM_ARCH == 5 && !defined(__ARM_ARCH_5__))) 104 #define __ARM_FEATURE_CLZ 105 #endif 106 107 #ifdef ARM_HAS_BX 108 #define JMP(r) bx r 109 #define JMPc(r, c) bx##c r 110 #else 111 #define JMP(r) mov pc, r 112 #define JMPc(r, c) mov##c pc, r 113 #endif 114 115 // pop {pc} can't switch Thumb mode on ARMv4T 116 #if __ARM_ARCH >= 5 117 #define POP_PC() pop {pc} 118 #else 119 #define POP_PC() \ 120 pop {ip}; \ 121 JMP(ip) 122 #endif 123 124 #if defined(USE_THUMB_2) 125 #define WIDE(op) op.w 126 #else 127 #define WIDE(op) op 128 #endif 129 #else // !defined(__arm) 130 #define DECLARE_FUNC_ENCODING 131 #define DEFINE_CODE_STATE 132 #endif 133 134 #define GLUE2(a, b) a##b 135 #define GLUE(a, b) GLUE2(a, b) 136 #define SYMBOL_NAME(name) GLUE(__USER_LABEL_PREFIX__, name) 137 138 #ifdef VISIBILITY_HIDDEN 139 #define DECLARE_SYMBOL_VISIBILITY(name) \ 140 HIDDEN(SYMBOL_NAME(name)) SEPARATOR 141 #else 142 #define DECLARE_SYMBOL_VISIBILITY(name) 143 #endif 144 145 #define DEFINE_COMPILERRT_FUNCTION(name) \ 146 DEFINE_CODE_STATE \ 147 FILE_LEVEL_DIRECTIVE SEPARATOR \ 148 .globl SYMBOL_NAME(name) SEPARATOR \ 149 SYMBOL_IS_FUNC(SYMBOL_NAME(name)) SEPARATOR \ 150 DECLARE_SYMBOL_VISIBILITY(name) \ 151 DECLARE_FUNC_ENCODING \ 152 SYMBOL_NAME(name): 153 154 #define DEFINE_COMPILERRT_THUMB_FUNCTION(name) \ 155 DEFINE_CODE_STATE \ 156 FILE_LEVEL_DIRECTIVE SEPARATOR \ 157 .globl SYMBOL_NAME(name) SEPARATOR \ 158 SYMBOL_IS_FUNC(SYMBOL_NAME(name)) SEPARATOR \ 159 DECLARE_SYMBOL_VISIBILITY(name) SEPARATOR \ 160 .thumb_func SEPARATOR \ 161 SYMBOL_NAME(name): 162 163 #define DEFINE_COMPILERRT_PRIVATE_FUNCTION(name) \ 164 DEFINE_CODE_STATE \ 165 FILE_LEVEL_DIRECTIVE SEPARATOR \ 166 .globl SYMBOL_NAME(name) SEPARATOR \ 167 SYMBOL_IS_FUNC(SYMBOL_NAME(name)) SEPARATOR \ 168 HIDDEN(SYMBOL_NAME(name)) SEPARATOR \ 169 DECLARE_FUNC_ENCODING \ 170 SYMBOL_NAME(name): 171 172 #define DEFINE_COMPILERRT_PRIVATE_FUNCTION_UNMANGLED(name) \ 173 DEFINE_CODE_STATE \ 174 .globl name SEPARATOR \ 175 SYMBOL_IS_FUNC(name) SEPARATOR \ 176 HIDDEN(name) SEPARATOR \ 177 DECLARE_FUNC_ENCODING \ 178 name: 179 180 #define DEFINE_COMPILERRT_FUNCTION_ALIAS(name, target) \ 181 .globl SYMBOL_NAME(name) SEPARATOR \ 182 SYMBOL_IS_FUNC(SYMBOL_NAME(name)) SEPARATOR \ 183 DECLARE_SYMBOL_VISIBILITY(SYMBOL_NAME(name)) SEPARATOR \ 184 .set SYMBOL_NAME(name), SYMBOL_NAME(target) SEPARATOR 185 186 #if defined(__ARM_EABI__) 187 #define DEFINE_AEABI_FUNCTION_ALIAS(aeabi_name, name) \ 188 DEFINE_COMPILERRT_FUNCTION_ALIAS(aeabi_name, name) 189 #else 190 #define DEFINE_AEABI_FUNCTION_ALIAS(aeabi_name, name) 191 #endif 192 193 #ifdef __ELF__ 194 #define END_COMPILERRT_FUNCTION(name) \ 195 .size SYMBOL_NAME(name), . - SYMBOL_NAME(name) 196 #else 197 #define END_COMPILERRT_FUNCTION(name) 198 #endif 199 200 #endif // COMPILERRT_ASSEMBLY_H 201