contrib/llvm/projects/libunwind/src/assembly.h

   1 /* ===-- assembly.h - libUnwind 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 libUnwind assembler source.
  11  * This file is not part of the interface of this library.
  12  *
  13  * ===----------------------------------------------------------------------===
  14  */
  15
  16 #ifndef UNWIND_ASSEMBLY_H
  17 #define UNWIND_ASSEMBLY_H
  18
  19 #if defined(__POWERPC__) || defined(__powerpc__) || defined(__ppc__)
  20 #define SEPARATOR @
  21 #elif defined(__arm64__)
  22 #define SEPARATOR %%
  23 #else
  24 #define SEPARATOR ;
  25 #endif
  26
  27 #if defined(__APPLE__)
  28 #define HIDDEN_DIRECTIVE .private_extern
  29 #else
  30 #define HIDDEN_DIRECTIVE .hidden
  31 #endif
  32
  33 #define GLUE2(a, b) a ## b
  34 #define GLUE(a, b) GLUE2(a, b)
  35 #define SYMBOL_NAME(name) GLUE(__USER_LABEL_PREFIX__, name)
  36
  37 #if defined(__APPLE__)
  38
  39 #define SYMBOL_IS_FUNC(name)
  40 #define NO_EXEC_STACK_DIRECTIVE
  41
  42 #elif defined(__ELF__)
  43
  44 #if defined(__arm__)
  45 #define SYMBOL_IS_FUNC(name) .type name,%function
  46 #else
  47 #define SYMBOL_IS_FUNC(name) .type name,@function
  48 #endif
  49
  50 #if defined(__GNU__) || defined(__ANDROID__) || defined(__FreeBSD__)
  51 #define NO_EXEC_STACK_DIRECTIVE .section .note.GNU-stack,"",%progbits
  52 #else
  53 #define NO_EXEC_STACK_DIRECTIVE
  54 #endif
  55
  56 #else
  57
  58 #define SYMBOL_IS_FUNC(name)                                                   \
  59   .def name SEPARATOR                                                          \
  60     .scl 2 SEPARATOR                                                           \
  61     .type 32 SEPARATOR                                                         \
  62   .endef
  63
  64 #define NO_EXEC_STACK_DIRECTIVE
  65
  66 #endif
  67
  68 #define DEFINE_LIBUNWIND_FUNCTION(name)                   \
  69   .globl SYMBOL_NAME(name) SEPARATOR                      \
  70   SYMBOL_IS_FUNC(SYMBOL_NAME(name)) SEPARATOR             \
  71   SYMBOL_NAME(name):
  72
  73 #define DEFINE_LIBUNWIND_PRIVATE_FUNCTION(name)           \
  74   .globl SYMBOL_NAME(name) SEPARATOR                      \
  75   HIDDEN_DIRECTIVE SYMBOL_NAME(name) SEPARATOR            \
  76   SYMBOL_IS_FUNC(SYMBOL_NAME(name)) SEPARATOR             \
  77   SYMBOL_NAME(name):
  78
  79 #if defined(__arm__)
  80 #if !defined(__ARM_ARCH)
  81 #define __ARM_ARCH 4
  82 #endif
  83
  84 #if defined(__ARM_ARCH_4T__) || __ARM_ARCH >= 5
  85 #define ARM_HAS_BX
  86 #endif
  87
  88 #ifdef ARM_HAS_BX
  89 #define JMP(r) bx r
  90 #else
  91 #define JMP(r) mov pc, r
  92 #endif
  93 #endif /* __arm__ */
  94
  95 #endif /* UNWIND_ASSEMBLY_H */