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assembly.h revision 1.1.1.2 
      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 #elif defined(__ELF__)
     32 #define HIDDEN(name) .hidden name
     33 #define LOCAL_LABEL(name) .L_##name
     34 #define FILE_LEVEL_DIRECTIVE
     35 #if defined(__arm__)
     36 #define SYMBOL_IS_FUNC(name) .type name,%function
     37 #else
     38 #define SYMBOL_IS_FUNC(name) .type name,@function
     39 #endif
     40 #else
     41 #define HIDDEN_DIRECTIVE(name)
     42 #define LOCAL_LABEL(name) .L ## name
     43 #define SYMBOL_IS_FUNC(name)                                                   \
     44   .def name SEPARATOR                                                          \
     45     .scl 3 SEPARATOR                                                           \
     46     .type 32 SEPARATOR                                                         \
     47   .endef
     48 #define FILE_LEVEL_DIRECTIVE
     49 #endif
     50 
     51 #if defined(__arm__)
     52 #ifndef __ARM_ARCH
     53 #if defined(__ARM_ARCH_7__) || defined(__ARM_ARCH_7A__) ||                     \
     54     defined(__ARM_ARCH_7R__) || defined(__ARM_ARCH_7M__) ||                    \
     55     defined(__ARM_ARCH_7EM__)
     56 #define __ARM_ARCH 7
     57 #endif
     58 #endif
     59 
     60 #ifndef __ARM_ARCH
     61 #if defined(__ARM_ARCH_6__) || defined(__ARM_ARCH_6J__) ||                     \
     62     defined(__ARM_ARCH_6K__) || defined(__ARM_ARCH_6Z__) ||                    \
     63     defined(__ARM_ARCH_6ZK__) || defined(__ARM_ARCH_6ZM__)
     64 #define __ARM_ARCH 6
     65 #endif
     66 #endif
     67 
     68 #ifndef __ARM_ARCH
     69 #if defined(__ARM_ARCH_5__) || defined(__ARM_ARCH_5T__) ||                     \
     70     defined(__ARM_ARCH_5TE__) || defined(__ARM_ARCH_5TEJ__)
     71 #define __ARM_ARCH 5
     72 #endif
     73 #endif
     74 
     75 #ifndef __ARM_ARCH
     76 #define __ARM_ARCH 4
     77 #endif
     78 
     79 #if defined(__ARM_ARCH_4T__) || __ARM_ARCH >= 5
     80 #define ARM_HAS_BX
     81 #endif
     82 #if !defined(__ARM_FEATURE_CLZ) &&                                             \
     83     (__ARM_ARCH >= 6 || (__ARM_ARCH == 5 && !defined(__ARM_ARCH_5__)))
     84 #define __ARM_FEATURE_CLZ
     85 #endif
     86 
     87 #ifdef ARM_HAS_BX
     88 #define JMP(r) bx r
     89 #define JMPc(r, c) bx##c r
     90 #else
     91 #define JMP(r) mov pc, r
     92 #define JMPc(r, c) mov##c pc, r
     93 #endif
     94 #endif
     95 
     96 #define GLUE2(a, b) a##b
     97 #define GLUE(a, b) GLUE2(a, b)
     98 #define SYMBOL_NAME(name) GLUE(__USER_LABEL_PREFIX__, name)
     99 
    100 #ifdef VISIBILITY_HIDDEN
    101 #define DECLARE_SYMBOL_VISIBILITY(name)                                        \
    102   HIDDEN(SYMBOL_NAME(name)) SEPARATOR
    103 #else
    104 #define DECLARE_SYMBOL_VISIBILITY(name)
    105 #endif
    106 
    107 #define DEFINE_COMPILERRT_FUNCTION(name)                                       \
    108   FILE_LEVEL_DIRECTIVE SEPARATOR                                               \
    109   .globl SYMBOL_NAME(name) SEPARATOR                                           \
    110   SYMBOL_IS_FUNC(SYMBOL_NAME(name)) SEPARATOR                                  \
    111   DECLARE_SYMBOL_VISIBILITY(name)                                              \
    112   SYMBOL_NAME(name):
    113 
    114 #define DEFINE_COMPILERRT_PRIVATE_FUNCTION(name)                               \
    115   FILE_LEVEL_DIRECTIVE SEPARATOR                                               \
    116   .globl SYMBOL_NAME(name) SEPARATOR                                           \
    117   SYMBOL_IS_FUNC(SYMBOL_NAME(name)) SEPARATOR                                  \
    118   HIDDEN(SYMBOL_NAME(name)) SEPARATOR                                          \
    119   SYMBOL_NAME(name):
    120 
    121 #define DEFINE_COMPILERRT_PRIVATE_FUNCTION_UNMANGLED(name)                     \
    122   .globl name SEPARATOR                                                        \
    123   SYMBOL_IS_FUNC(name) SEPARATOR                                               \
    124   HIDDEN(name) SEPARATOR                                                       \
    125   name:
    126 
    127 #define DEFINE_COMPILERRT_FUNCTION_ALIAS(name, target)                         \
    128   .globl SYMBOL_NAME(name) SEPARATOR                                           \
    129   SYMBOL_IS_FUNC(SYMBOL_NAME(name)) SEPARATOR                                  \
    130   .set SYMBOL_NAME(name), SYMBOL_NAME(target) SEPARATOR
    131 
    132 #if defined(__ARM_EABI__)
    133 #define DEFINE_AEABI_FUNCTION_ALIAS(aeabi_name, name)                          \
    134   DEFINE_COMPILERRT_FUNCTION_ALIAS(aeabi_name, name)
    135 #else
    136 #define DEFINE_AEABI_FUNCTION_ALIAS(aeabi_name, name)
    137 #endif
    138 
    139 #ifdef __ELF__
    140 #define END_COMPILERRT_FUNCTION(name)                                          \
    141   .size SYMBOL_NAME(name), . - SYMBOL_NAME(name)
    142 #else
    143 #define END_COMPILERRT_FUNCTION(name)
    144 #endif
    145 
    146 #endif /* COMPILERRT_ASSEMBLY_H */
    147