1 /* ===-- assembly.h - compiler-rt assembler support macros -----------------=== 2 * 3 * The LLVM Compiler Infrastructure 4 * 5 * This file is dual licensed under the MIT and the University of Illinois Open 6 * Source Licenses. See LICENSE.TXT for details. 7 * 8 * ===----------------------------------------------------------------------=== 9 * 10 * This file defines macros for use in compiler-rt assembler source. 11 * This file is not part of the interface of this library. 12 * 13 * ===----------------------------------------------------------------------=== 14 */ 15 16 #ifndef COMPILERRT_ASSEMBLY_H 17 #define COMPILERRT_ASSEMBLY_H 18 19 #if defined(__POWERPC__) || defined(__powerpc__) || defined(__ppc__) 20 #define SEPARATOR @ 21 #else 22 #define SEPARATOR ; 23 #endif 24 25 #if defined(__APPLE__) 26 #define HIDDEN(name) .private_extern name 27 #define LOCAL_LABEL(name) L_##name 28 // tell linker it can break up file at label boundaries 29 #define FILE_LEVEL_DIRECTIVE .subsections_via_symbols 30 #define SYMBOL_IS_FUNC(name) 31 #define CONST_SECTION .const 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 #else // !__APPLE__ && !__ELF__ 46 47 #define HIDDEN(name) 48 #define LOCAL_LABEL(name) .L ## name 49 #define FILE_LEVEL_DIRECTIVE 50 #define SYMBOL_IS_FUNC(name) \ 51 .def name SEPARATOR \ 52 .scl 2 SEPARATOR \ 53 .type 32 SEPARATOR \ 54 .endef 55 #define CONST_SECTION .section .rdata,"rd" 56 57 #endif 58 59 #if defined(__arm__) 60 #if defined(__ARM_ARCH_4T__) || __ARM_ARCH >= 5 61 #define ARM_HAS_BX 62 #endif 63 #if !defined(__ARM_FEATURE_CLZ) && \ 64 (__ARM_ARCH >= 6 || (__ARM_ARCH == 5 && !defined(__ARM_ARCH_5__))) 65 #define __ARM_FEATURE_CLZ 66 #endif 67 68 #ifdef ARM_HAS_BX 69 #define JMP(r) bx r 70 #define JMPc(r, c) bx##c r 71 #else 72 #define JMP(r) mov pc, r 73 #define JMPc(r, c) mov##c pc, r 74 #endif 75 76 // pop {pc} can't switch Thumb mode on ARMv4T 77 #if __ARM_ARCH >= 5 78 #define POP_PC() pop {pc} 79 #else 80 #define POP_PC() \ 81 pop {ip}; \ 82 JMP(ip) 83 #endif 84 85 #if __ARM_ARCH_ISA_THUMB == 2 86 #define IT(cond) it cond 87 #define ITT(cond) itt cond 88 #else 89 #define IT(cond) 90 #define ITT(cond) 91 #endif 92 93 #if __ARM_ARCH_ISA_THUMB == 2 94 #define WIDE(op) op.w 95 #else 96 #define WIDE(op) op 97 #endif 98 #endif 99 100 #define GLUE2(a, b) a##b 101 #define GLUE(a, b) GLUE2(a, b) 102 #define SYMBOL_NAME(name) GLUE(__USER_LABEL_PREFIX__, name) 103 104 #ifdef VISIBILITY_HIDDEN 105 #define DECLARE_SYMBOL_VISIBILITY(name) \ 106 HIDDEN(SYMBOL_NAME(name)) SEPARATOR 107 #else 108 #define DECLARE_SYMBOL_VISIBILITY(name) 109 #endif 110 111 #define DEFINE_COMPILERRT_FUNCTION(name) \ 112 FILE_LEVEL_DIRECTIVE SEPARATOR \ 113 .globl SYMBOL_NAME(name) SEPARATOR \ 114 SYMBOL_IS_FUNC(SYMBOL_NAME(name)) SEPARATOR \ 115 DECLARE_SYMBOL_VISIBILITY(name) \ 116 SYMBOL_NAME(name): 117 118 #define DEFINE_COMPILERRT_THUMB_FUNCTION(name) \ 119 FILE_LEVEL_DIRECTIVE SEPARATOR \ 120 .globl SYMBOL_NAME(name) SEPARATOR \ 121 SYMBOL_IS_FUNC(SYMBOL_NAME(name)) SEPARATOR \ 122 DECLARE_SYMBOL_VISIBILITY(name) SEPARATOR \ 123 .thumb_func SEPARATOR \ 124 SYMBOL_NAME(name): 125 126 #define DEFINE_COMPILERRT_PRIVATE_FUNCTION(name) \ 127 FILE_LEVEL_DIRECTIVE SEPARATOR \ 128 .globl SYMBOL_NAME(name) SEPARATOR \ 129 SYMBOL_IS_FUNC(SYMBOL_NAME(name)) SEPARATOR \ 130 HIDDEN(SYMBOL_NAME(name)) SEPARATOR \ 131 SYMBOL_NAME(name): 132 133 #define DEFINE_COMPILERRT_PRIVATE_FUNCTION_UNMANGLED(name) \ 134 .globl name SEPARATOR \ 135 SYMBOL_IS_FUNC(name) SEPARATOR \ 136 HIDDEN(name) SEPARATOR \ 137 name: 138 139 #define DEFINE_COMPILERRT_FUNCTION_ALIAS(name, target) \ 140 .globl SYMBOL_NAME(name) SEPARATOR \ 141 SYMBOL_IS_FUNC(SYMBOL_NAME(name)) SEPARATOR \ 142 .set SYMBOL_NAME(name), SYMBOL_NAME(target) SEPARATOR 143 144 #if defined(__ARM_EABI__) 145 #define DEFINE_AEABI_FUNCTION_ALIAS(aeabi_name, name) \ 146 DEFINE_COMPILERRT_FUNCTION_ALIAS(aeabi_name, name) 147 #else 148 #define DEFINE_AEABI_FUNCTION_ALIAS(aeabi_name, name) 149 #endif 150 151 #ifdef __ELF__ 152 #define END_COMPILERRT_FUNCTION(name) \ 153 .size SYMBOL_NAME(name), . - SYMBOL_NAME(name) 154 #else 155 #define END_COMPILERRT_FUNCTION(name) 156 #endif 157 158 #endif /* COMPILERRT_ASSEMBLY_H */ 159