libsanitizer/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) &&                                             \
  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 #if __ARM_ARCH_ISA_THUMB == 2
  96 #define IT(cond)  it cond
  97 #define ITT(cond) itt cond
  98 #else
  99 #define IT(cond)
 100 #define ITT(cond)
 101 #endif
 102
 103 #if __ARM_ARCH_ISA_THUMB == 2
 104 #define WIDE(op) op.w
 105 #else
 106 #define WIDE(op) op
 107 #endif
 108 #endif
 109
 110 #define GLUE2(a, b) a##b
 111 #define GLUE(a, b) GLUE2(a, b)
 112 #define SYMBOL_NAME(name) GLUE(__USER_LABEL_PREFIX__, name)
 113
 114 #ifdef VISIBILITY_HIDDEN
 115 #define DECLARE_SYMBOL_VISIBILITY(name)                                        \
 116   HIDDEN(SYMBOL_NAME(name)) SEPARATOR
 117 #else
 118 #define DECLARE_SYMBOL_VISIBILITY(name)
 119 #endif
 120
 121 #define DEFINE_COMPILERRT_FUNCTION(name)                                       \
 122   FILE_LEVEL_DIRECTIVE SEPARATOR                                               \
 123   .globl SYMBOL_NAME(name) SEPARATOR                                           \
 124   SYMBOL_IS_FUNC(SYMBOL_NAME(name)) SEPARATOR                                  \
 125   DECLARE_SYMBOL_VISIBILITY(name)                                              \
 126   SYMBOL_NAME(name):
 127
 128 #define DEFINE_COMPILERRT_THUMB_FUNCTION(name)                                 \
 129   FILE_LEVEL_DIRECTIVE SEPARATOR                                               \
 130   .globl SYMBOL_NAME(name) SEPARATOR                                           \
 131   SYMBOL_IS_FUNC(SYMBOL_NAME(name)) SEPARATOR                                  \
 132   DECLARE_SYMBOL_VISIBILITY(name) SEPARATOR                                    \
 133   .thumb_func SEPARATOR                                                        \
 134   SYMBOL_NAME(name):
 135
 136 #define DEFINE_COMPILERRT_PRIVATE_FUNCTION(name)                               \
 137   FILE_LEVEL_DIRECTIVE SEPARATOR                                               \
 138   .globl SYMBOL_NAME(name) SEPARATOR                                           \
 139   SYMBOL_IS_FUNC(SYMBOL_NAME(name)) SEPARATOR                                  \
 140   HIDDEN(SYMBOL_NAME(name)) SEPARATOR                                          \
 141   SYMBOL_NAME(name):
 142
 143 #define DEFINE_COMPILERRT_PRIVATE_FUNCTION_UNMANGLED(name)                     \
 144   .globl name SEPARATOR                                                        \
 145   SYMBOL_IS_FUNC(name) SEPARATOR                                               \
 146   HIDDEN(name) SEPARATOR                                                       \
 147   name:
 148
 149 #define DEFINE_COMPILERRT_FUNCTION_ALIAS(name, target)                         \
 150   .globl SYMBOL_NAME(name) SEPARATOR                                           \
 151   SYMBOL_IS_FUNC(SYMBOL_NAME(name)) SEPARATOR                                  \
 152   DECLARE_SYMBOL_VISIBILITY(SYMBOL_NAME(name)) SEPARATOR                       \
 153   .set SYMBOL_NAME(name), SYMBOL_NAME(target) SEPARATOR
 154
 155 #if defined(__ARM_EABI__)
 156 #define DEFINE_AEABI_FUNCTION_ALIAS(aeabi_name, name)                          \
 157   DEFINE_COMPILERRT_FUNCTION_ALIAS(aeabi_name, name)
 158 #else
 159 #define DEFINE_AEABI_FUNCTION_ALIAS(aeabi_name, name)
 160 #endif
 161
 162 #ifdef __ELF__
 163 #define END_COMPILERRT_FUNCTION(name)                                          \
 164   .size SYMBOL_NAME(name), . - SYMBOL_NAME(name)
 165 #else
 166 #define END_COMPILERRT_FUNCTION(name)
 167 #endif
 168
 169 #endif /* COMPILERRT_ASSEMBLY_H */