1 //===-- assembly.h - compiler-rt assembler support macros -----------------===//
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
7 //===----------------------------------------------------------------------===//
9 // This file defines macros for use in compiler-rt assembler source.
10 // This file is not part of the interface of this library.
12 //===----------------------------------------------------------------------===//
14 #ifndef COMPILERRT_ASSEMBLY_H
15 #define COMPILERRT_ASSEMBLY_H
17 #if defined(__POWERPC__) || defined(__powerpc__) || defined(__ppc__)
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
31 #define NO_EXEC_STACK_DIRECTIVE
33 #elif defined(__ELF__)
35 #define HIDDEN(name) .hidden name
36 #define LOCAL_LABEL(name) .L_##name
37 #define FILE_LEVEL_DIRECTIVE
39 #define SYMBOL_IS_FUNC(name) .type name,%function
41 #define SYMBOL_IS_FUNC(name) .type name,@function
43 #define CONST_SECTION .section .rodata
45 #if defined(__GNU__) || defined(__FreeBSD__) || defined(__Fuchsia__) || \
47 #define NO_EXEC_STACK_DIRECTIVE .section .note.GNU-stack,"",%progbits
49 #define NO_EXEC_STACK_DIRECTIVE
52 #else // !__APPLE__ && !__ELF__
55 #define LOCAL_LABEL(name) .L ## name
56 #define FILE_LEVEL_DIRECTIVE
57 #define SYMBOL_IS_FUNC(name) \
62 #define CONST_SECTION .section .rdata,"rd"
64 #define NO_EXEC_STACK_DIRECTIVE
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__)
78 #define IT(cond) it cond
79 #define ITT(cond) itt cond
80 #define ITE(cond) 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
95 #if defined(USE_THUMB_1) && defined(USE_THUMB_2)
96 #error "USE_THUMB_1 and USE_THUMB_2 can't be defined together."
99 #if defined(__ARM_ARCH_4T__) || __ARM_ARCH >= 5
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
109 #define JMPc(r, c) bx##c r
111 #define JMP(r) mov pc, r
112 #define JMPc(r, c) mov##c pc, r
115 // pop {pc} can't switch Thumb mode on ARMv4T
117 #define POP_PC() pop {pc}
124 #if defined(USE_THUMB_2)
125 #define WIDE(op) op.w
129 #else // !defined(__arm)
130 #define DECLARE_FUNC_ENCODING
131 #define DEFINE_CODE_STATE
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)
138 #ifdef VISIBILITY_HIDDEN
139 #define DECLARE_SYMBOL_VISIBILITY(name) \
140 HIDDEN(SYMBOL_NAME(name)) SEPARATOR
142 #define DECLARE_SYMBOL_VISIBILITY(name)
145 #define DEFINE_COMPILERRT_FUNCTION(name) \
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 \
154 #define DEFINE_COMPILERRT_THUMB_FUNCTION(name) \
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 \
163 #define DEFINE_COMPILERRT_PRIVATE_FUNCTION(name) \
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 \
172 #define DEFINE_COMPILERRT_PRIVATE_FUNCTION_UNMANGLED(name) \
174 .globl name SEPARATOR \
175 SYMBOL_IS_FUNC(name) SEPARATOR \
176 HIDDEN(name) SEPARATOR \
177 DECLARE_FUNC_ENCODING \
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
186 #if defined(__ARM_EABI__)
187 #define DEFINE_AEABI_FUNCTION_ALIAS(aeabi_name, name) \
188 DEFINE_COMPILERRT_FUNCTION_ALIAS(aeabi_name, name)
190 #define DEFINE_AEABI_FUNCTION_ALIAS(aeabi_name, name)
194 #define END_COMPILERRT_FUNCTION(name) \
195 .size SYMBOL_NAME(name), . - SYMBOL_NAME(name)
197 #define END_COMPILERRT_FUNCTION(name)
200 #endif // COMPILERRT_ASSEMBLY_H