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