include/wine/asm.h

   1 /*
   2  * Inline assembly support
   3  *
   4  * Copyright 2019 Alexandre Julliard
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  */
  20
  21 #ifndef __WINE_WINE_ASM_H
  22 #define __WINE_WINE_ASM_H
  23
  24 #if defined(__APPLE__) || (defined(_WIN32) && defined(__i386__))
  25 # define __ASM_NAME(name) "_" name
  26 #else
  27 # define __ASM_NAME(name) name
  28 #endif
  29
  30 #if defined(_WIN32) && defined(__i386__)
  31 # define __ASM_STDCALL(name,args) __ASM_NAME(name) "@" #args
  32 #else
  33 # define __ASM_STDCALL(name,args) __ASM_NAME(name)
  34 #endif
  35
  36 #if defined(__GCC_HAVE_DWARF2_CFI_ASM) || (defined(__clang__) && defined(__GNUC__) && !defined(__SEH__))
  37 # define __ASM_CFI(str) str
  38 #else
  39 # define __ASM_CFI(str)
  40 #endif
  41
  42 #ifdef __SEH__
  43 # if defined(__aarch64__) && defined(__clang_major__) && (__clang_major__ < 12 || defined(__apple_build_version__))
  44    /* Clang got support for aarch64 SEH assembly directives in Clang 12,
  45     * before that, only .seh_startproc/.seh_endproc but nothing else was
  46     * supported. Support for it doesn't exist in any Apple branded version
  47     * of Clang yet. */
  48 #  define __ASM_SEH(str)
  49 # else
  50 #  define __ASM_SEH(str) str
  51 # endif
  52 #else
  53 # define __ASM_SEH(str)
  54 #endif
  55
  56 #ifdef _WIN32
  57 # define __ASM_FUNC_TYPE(name) ".def " name "; .scl 2; .type 32; .endef"
  58 #elif defined(__APPLE__)
  59 # define __ASM_FUNC_TYPE(name) ""
  60 #elif defined(__arm__) || defined(__arm64__)
  61 # define __ASM_FUNC_TYPE(name) ".type " name ",%function"
  62 #else
  63 # define __ASM_FUNC_TYPE(name) ".type " name ",@function"
  64 #endif
  65
  66 #if !defined(__GNUC__) && !defined(__clang__)
  67 # define __ASM_BLOCK_BEGIN(name) void __asm_dummy_##name(void) {
  68 # define __ASM_BLOCK_END         }
  69 #else
  70 # define __ASM_BLOCK_BEGIN(name)
  71 # define __ASM_BLOCK_END
  72 #endif
  73
  74 #define __ASM_DEFINE_FUNC(name,code)  \
  75     __ASM_BLOCK_BEGIN(__LINE__) \
  76     asm(".text\n\t.align 4\n\t.globl " name "\n\t" __ASM_FUNC_TYPE(name) __ASM_SEH("\n\t.seh_proc " name) "\n" name ":\n\t" \
  77         __ASM_CFI(".cfi_startproc\n\t") code __ASM_CFI("\n\t.cfi_endproc") __ASM_SEH("\n\t.seh_endproc") ); \
  78     __ASM_BLOCK_END
  79
  80 #define __ASM_GLOBAL_FUNC(name,code) __ASM_DEFINE_FUNC(__ASM_NAME(#name),code)
  81
  82 #define __ASM_STDCALL_FUNC(name,args,code) __ASM_DEFINE_FUNC(__ASM_STDCALL(#name,args),code)
  83
  84 /* fastcall support */
  85
  86 #if defined(__i386__) && !defined(_WIN32)
  87
  88 # define DEFINE_FASTCALL1_WRAPPER(func) \
  89     __ASM_STDCALL_FUNC( __fastcall_ ## func, 4, \
  90                         "popl %eax\n\t"  \
  91                         "pushl %ecx\n\t" \
  92                         "pushl %eax\n\t" \
  93                         "jmp " __ASM_STDCALL(#func,4) )
  94 # define DEFINE_FASTCALL_WRAPPER(func,args) \
  95     __ASM_STDCALL_FUNC( __fastcall_ ## func, args, \
  96                         "popl %eax\n\t"  \
  97                         "pushl %edx\n\t" \
  98                         "pushl %ecx\n\t" \
  99                         "pushl %eax\n\t" \
 100                         "jmp " __ASM_STDCALL(#func,args) )
 101
 102 #else  /* __i386__ */
 103
 104 # define DEFINE_FASTCALL1_WRAPPER(func) /* nothing */
 105 # define DEFINE_FASTCALL_WRAPPER(func,args) /* nothing */
 106
 107 #endif  /* __i386__ */
 108
 109 /* thiscall support */
 110
 111 #if defined(__i386__) && !defined(__MINGW32__) && (!defined(_MSC_VER) || !defined(__clang__))
 112
 113 #define __ASM_USE_THISCALL_WRAPPER
 114 # ifdef _MSC_VER
 115 #  define DEFINE_THISCALL_WRAPPER(func,args) \
 116     __declspec(naked) void __thiscall_##func(void) \
 117     { __asm { \
 118         pop eax \
 119         push ecx \
 120         push eax \
 121         jmp func \
 122     } }
 123 # else  /* _MSC_VER */
 124 #  define DEFINE_THISCALL_WRAPPER(func,args) \
 125     extern void __thiscall_ ## func(void);  \
 126     __ASM_STDCALL_FUNC( __thiscall_ ## func, args, \
 127                        "popl %eax\n\t"  \
 128                        "pushl %ecx\n\t" \
 129                        "pushl %eax\n\t" \
 130                         "jmp " __ASM_STDCALL(#func,args) )
 131 # endif  /* _MSC_VER */
 132
 133 # define THISCALL(func) (void *)__thiscall_ ## func
 134 # define THISCALL_NAME(func) __ASM_NAME("__thiscall_" #func)
 135
 136 #else  /* __i386__ */
 137
 138 # define DEFINE_THISCALL_WRAPPER(func,args) /* nothing */
 139 # define THISCALL(func) func
 140 # define THISCALL_NAME(func) __ASM_NAME(#func)
 141
 142 #endif  /* __i386__ */
 143
 144 #if defined(__GNUC__) && !defined(_WIN32) && !defined(__APPLE__) && !defined(__ANDROID__)
 145 #define __ASM_OBSOLETE(func) __asm__( ".symver " #func "_obsolete," #func "@WINE_1.0" )
 146 #else
 147 #undef __ASM_OBSOLETE
 148 #endif
 149
 150 #endif  /* __WINE_WINE_ASM_H */