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 #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 */