contrib/compiler-rt/lib/builtins/assembly.h

   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 #define NO_EXEC_STACK_DIRECTIVE
  34
  35 #elif defined(__ELF__)
  36
  37 #define HIDDEN(name) .hidden name
  38 #define LOCAL_LABEL(name) .L_##name
  39 #define FILE_LEVEL_DIRECTIVE
  40 #if defined(__arm__)
  41 #define SYMBOL_IS_FUNC(name) .type name,%function
  42 #else
  43 #define SYMBOL_IS_FUNC(name) .type name,@function
  44 #endif
  45 #define CONST_SECTION .section .rodata
  46
  47 #if defined(__GNU__) || defined(__ANDROID__) || defined(__FreeBSD__)
  48 #define NO_EXEC_STACK_DIRECTIVE .section .note.GNU-stack,"",%progbits
  49 #else
  50 #define NO_EXEC_STACK_DIRECTIVE
  51 #endif
  52
  53 #else // !__APPLE__ && !__ELF__
  54
  55 #define HIDDEN(name)
  56 #define LOCAL_LABEL(name) .L ## name
  57 #define FILE_LEVEL_DIRECTIVE
  58 #define SYMBOL_IS_FUNC(name)                                                   \
  59   .def name SEPARATOR                                                          \
  60     .scl 2 SEPARATOR                                                           \
  61     .type 32 SEPARATOR                                                         \
  62   .endef
  63 #define CONST_SECTION .section .rdata,"rd"
  64
  65 #define NO_EXEC_STACK_DIRECTIVE
  66
  67 #endif
  68
  69 #if defined(__arm__)
  70 #if defined(__ARM_ARCH_4T__) || __ARM_ARCH >= 5
  71 #define ARM_HAS_BX
  72 #endif
  73 #if !defined(__ARM_FEATURE_CLZ) && __ARM_ARCH_ISA_THUMB != 1 &&                \
  74     (__ARM_ARCH >= 6 || (__ARM_ARCH == 5 && !defined(__ARM_ARCH_5__)))
  75 #define __ARM_FEATURE_CLZ
  76 #endif
  77
  78 #ifdef ARM_HAS_BX
  79 #define JMP(r) bx r
  80 #define JMPc(r, c) bx##c r
  81 #else
  82 #define JMP(r) mov pc, r
  83 #define JMPc(r, c) mov##c pc, r
  84 #endif
  85
  86 // pop {pc} can't switch Thumb mode on ARMv4T
  87 #if __ARM_ARCH >= 5
  88 #define POP_PC() pop {pc}
  89 #else
  90 #define POP_PC()                                                               \
  91   pop {ip};                                                                    \
  92   JMP(ip)
  93 #endif
  94
  95 /*
  96  * Determine actual [ARM][THUMB[1][2]] ISA using compiler predefined macros:
  97  * - for '-mthumb -march=armv6' compiler defines '__thumb__'
  98  * - for '-mthumb -march=armv7' compiler defines '__thumb__' and '__thumb2__'
  99  */
 100 #if defined(__thumb2__)
 101 #define USE_THUMB_2 1
 102 #elif defined(__thumb__)
 103 #define USE_THUMB_1 1
 104 #endif
 105
 106 #if defined(USE_THUMB_1) && defined(USE_THUMB_2)
 107 #error "USE_THUMB_1 and USE_THUMB_2 can't be defined together."
 108 #endif
 109
 110 #if defined(USE_THUMB_1) || defined(USE_THUMB_1)
 111 #define USE_THUMB_PROLOGUE 1
 112 #endif
 113
 114 #if defined(USE_THUMB_2)
 115 #define IT(cond)  it cond
 116 #define ITT(cond) itt cond
 117 #define WIDE(op) op.w
 118 #else
 119 #define IT(cond)
 120 #define ITT(cond)
 121 #define WIDE(op) op
 122 #endif
 123 #endif /* defined(__arm__) */
 124
 125 #define GLUE2(a, b) a##b
 126 #define GLUE(a, b) GLUE2(a, b)
 127 #define SYMBOL_NAME(name) GLUE(__USER_LABEL_PREFIX__, name)
 128
 129 #ifdef VISIBILITY_HIDDEN
 130 #define DECLARE_SYMBOL_VISIBILITY(name)                                        \
 131   HIDDEN(SYMBOL_NAME(name)) SEPARATOR
 132 #else
 133 #define DECLARE_SYMBOL_VISIBILITY(name)
 134 #endif
 135
 136 #define DEFINE_COMPILERRT_FUNCTION(name)                                       \
 137   FILE_LEVEL_DIRECTIVE SEPARATOR                                               \
 138   .globl SYMBOL_NAME(name) SEPARATOR                                           \
 139   SYMBOL_IS_FUNC(SYMBOL_NAME(name)) SEPARATOR                                  \
 140   DECLARE_SYMBOL_VISIBILITY(name)                                              \
 141   SYMBOL_NAME(name):
 142
 143 #define DEFINE_COMPILERRT_THUMB_FUNCTION(name)                                 \
 144   FILE_LEVEL_DIRECTIVE SEPARATOR                                               \
 145   .globl SYMBOL_NAME(name) SEPARATOR                                           \
 146   SYMBOL_IS_FUNC(SYMBOL_NAME(name)) SEPARATOR                                  \
 147   DECLARE_SYMBOL_VISIBILITY(name) SEPARATOR                                    \
 148   .thumb_func SEPARATOR                                                        \
 149   SYMBOL_NAME(name):
 150
 151 #define DEFINE_COMPILERRT_PRIVATE_FUNCTION(name)                               \
 152   FILE_LEVEL_DIRECTIVE SEPARATOR                                               \
 153   .globl SYMBOL_NAME(name) SEPARATOR                                           \
 154   SYMBOL_IS_FUNC(SYMBOL_NAME(name)) SEPARATOR                                  \
 155   HIDDEN(SYMBOL_NAME(name)) SEPARATOR                                          \
 156   SYMBOL_NAME(name):
 157
 158 #define DEFINE_COMPILERRT_PRIVATE_FUNCTION_UNMANGLED(name)                     \
 159   .globl name SEPARATOR                                                        \
 160   SYMBOL_IS_FUNC(name) SEPARATOR                                               \
 161   HIDDEN(name) SEPARATOR                                                       \
 162   name:
 163
 164 #define DEFINE_COMPILERRT_FUNCTION_ALIAS(name, target)                         \
 165   .globl SYMBOL_NAME(name) SEPARATOR                                           \
 166   SYMBOL_IS_FUNC(SYMBOL_NAME(name)) SEPARATOR                                  \
 167   DECLARE_SYMBOL_VISIBILITY(SYMBOL_NAME(name)) SEPARATOR                       \
 168   .set SYMBOL_NAME(name), SYMBOL_NAME(target) SEPARATOR
 169
 170 #if defined(__ARM_EABI__)
 171 #define DEFINE_AEABI_FUNCTION_ALIAS(aeabi_name, name)                          \
 172   DEFINE_COMPILERRT_FUNCTION_ALIAS(aeabi_name, name)
 173 #else
 174 #define DEFINE_AEABI_FUNCTION_ALIAS(aeabi_name, name)
 175 #endif
 176
 177 #ifdef __ELF__
 178 #define END_COMPILERRT_FUNCTION(name)                                          \
 179   .size SYMBOL_NAME(name), . - SYMBOL_NAME(name)
 180 #else
 181 #define END_COMPILERRT_FUNCTION(name)
 182 #endif
 183
 184 #endif /* COMPILERRT_ASSEMBLY_H */