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assembly.h revision 1.1.1.4 
      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 */
    159