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