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)  "_" name "@" #args
  32 # define __ASM_FASTCALL(name,args) "@" name "@" #args
  33 #else
  34 # define __ASM_STDCALL(name,args)  __ASM_NAME(name)
  35 # define __ASM_FASTCALL(name,args) __ASM_NAME("__fastcall_" name)
  36 #endif
  37
  38 #if defined(__GCC_HAVE_DWARF2_CFI_ASM) || (defined(__clang__) && defined(__GNUC__) && !defined(__SEH__))
  39 # define __ASM_CFI(str) str
  40 #else
  41 # define __ASM_CFI(str)
  42 #endif
  43
  44 #if defined(__SEH__) || (defined(_MSC_VER) && defined(__clang__) && (defined(__x86_64__) || defined(__aarch64__)))
  45 # if defined(__aarch64__) && defined(__clang_major__) && (__clang_major__ < 12 || defined(__apple_build_version__))
  46    /* Clang got support for aarch64 SEH assembly directives in Clang 12,
  47     * before that, only .seh_startproc/.seh_endproc but nothing else was
  48     * supported. Support for it doesn't exist in any Apple branded version
  49     * of Clang yet. */
  50 #  define __ASM_SEH(str)
  51 # else
  52 #  define __ASM_SEH(str) str
  53 # endif
  54 #else
  55 # define __ASM_SEH(str)
  56 #endif
  57
  58 #ifdef _WIN32
  59 # define __ASM_FUNC_TYPE(name) ".def " name "\n\t.scl 2\n\t.type 32\n\t.endef"
  60 #elif defined(__APPLE__)
  61 # define __ASM_FUNC_TYPE(name) ""
  62 #elif defined(__arm__) && defined(__thumb__)
  63 # define __ASM_FUNC_TYPE(name) ".type " name ",%function\n\t.thumb_func"
  64 #elif defined(__arm__) || defined(__aarch64__)
  65 # define __ASM_FUNC_TYPE(name) ".type " name ",%function"
  66 #else
  67 # define __ASM_FUNC_TYPE(name) ".type " name ",@function"
  68 #endif
  69
  70 #ifdef _WIN32
  71 # define __ASM_FUNC_SIZE(name) ""
  72 #elif defined(__APPLE__)
  73 # define __ASM_FUNC_SIZE(name) ""
  74 #else
  75 # define __ASM_FUNC_SIZE(name) "\n\t.size " name ",.-" name
  76 #endif
  77
  78 #if !defined(__GNUC__) && !defined(__clang__)
  79 # define __ASM_BLOCK_BEGIN(name) void __asm_dummy_##name(void) {
  80 # define __ASM_BLOCK_END         }
  81 #else
  82 # define __ASM_BLOCK_BEGIN(name)
  83 # define __ASM_BLOCK_END
  84 #endif
  85
  86 #define __ASM_DEFINE_FUNC(name,code)  \
  87     __ASM_BLOCK_BEGIN(__LINE__) \
  88     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" \
  89         __ASM_CFI(".cfi_startproc\n\t") code __ASM_CFI("\n\t.cfi_endproc") __ASM_SEH("\n\t.seh_endproc") __ASM_FUNC_SIZE(name)); \
  90     __ASM_BLOCK_END
  91
  92 #define __ASM_GLOBAL_FUNC(name,code) __ASM_DEFINE_FUNC(__ASM_NAME(#name),code)
  93 #define __ASM_STDCALL_FUNC(name,args,code) __ASM_DEFINE_FUNC(__ASM_STDCALL(#name,args),code)
  94 #define __ASM_FASTCALL_FUNC(name,args,code) __ASM_DEFINE_FUNC(__ASM_FASTCALL(#name,args),code)
  95
  96 /* import variables */
  97
  98 #ifdef _WIN64
  99 #define __ASM_DEFINE_IMPORT(name) \
 100     __ASM_BLOCK_BEGIN(__LINE__) \
 101     asm(".data\n\t.balign 8\n\t.globl __imp_" name "\n__imp_" name ":\n\t.quad " name "\n\t.text"); \
 102     __ASM_BLOCK_END
 103 #else
 104 #define __ASM_DEFINE_IMPORT(name) \
 105     __ASM_BLOCK_BEGIN(__LINE__) \
 106     asm(".data\n\t.balign 4\n\t.globl __imp_" name "\n__imp_" name ":\n\t.long " name "\n\t.text"); \
 107     __ASM_BLOCK_END
 108 #endif
 109
 110 #ifdef _WIN32
 111 #define __ASM_GLOBAL_IMPORT(name) __ASM_DEFINE_IMPORT(__ASM_NAME(#name))
 112 #define __ASM_STDCALL_IMPORT(name,args) __ASM_DEFINE_IMPORT(__ASM_STDCALL(#name,args))
 113 #else
 114 #define __ASM_GLOBAL_IMPORT(name) /* nothing */
 115 #define __ASM_STDCALL_IMPORT(name,args) /* nothing */
 116 #endif
 117
 118 /* fastcall support */
 119
 120 #if defined(__i386__) && !defined(_WIN32)
 121
 122 # define DEFINE_FASTCALL1_WRAPPER(func) \
 123     __ASM_FASTCALL_FUNC( func, 4, \
 124                         "popl %eax\n\t"  \
 125                         "pushl %ecx\n\t" \
 126                         "pushl %eax\n\t" \
 127                         "jmp " __ASM_STDCALL(#func,4) )
 128 # define DEFINE_FASTCALL_WRAPPER(func,args) \
 129     __ASM_FASTCALL_FUNC( func, args, \
 130                         "popl %eax\n\t"  \
 131                         "pushl %edx\n\t" \
 132                         "pushl %ecx\n\t" \
 133                         "pushl %eax\n\t" \
 134                         "jmp " __ASM_STDCALL(#func,args) )
 135
 136 #else  /* __i386__ */
 137
 138 # define DEFINE_FASTCALL1_WRAPPER(func) /* nothing */
 139 # define DEFINE_FASTCALL_WRAPPER(func,args) /* nothing */
 140
 141 #endif  /* __i386__ */
 142
 143 /* thiscall support */
 144
 145 #if defined(__i386__) && !defined(__MINGW32__) && (!defined(_MSC_VER) || !defined(__clang__))
 146
 147 #define __ASM_USE_THISCALL_WRAPPER
 148 # ifdef _MSC_VER
 149 #  define DEFINE_THISCALL_WRAPPER(func,args) \
 150     __declspec(naked) void __thiscall_##func(void) \
 151     { __asm { \
 152         pop eax \
 153         push ecx \
 154         push eax \
 155         jmp func \
 156     } }
 157 # else  /* _MSC_VER */
 158 #  define DEFINE_THISCALL_WRAPPER(func,args) \
 159     extern void __thiscall_ ## func(void);  \
 160     __ASM_STDCALL_FUNC( __thiscall_ ## func, args, \
 161                        "popl %eax\n\t"  \
 162                        "pushl %ecx\n\t" \
 163                        "pushl %eax\n\t" \
 164                         "jmp " __ASM_STDCALL(#func,args) )
 165 # endif  /* _MSC_VER */
 166
 167 # define THISCALL(func) (void *)__thiscall_ ## func
 168 # define THISCALL_NAME(func) __ASM_NAME("__thiscall_" #func)
 169
 170 #else  /* __i386__ */
 171
 172 # define DEFINE_THISCALL_WRAPPER(func,args) /* nothing */
 173 # define THISCALL(func) func
 174 # define THISCALL_NAME(func) __ASM_NAME(#func)
 175
 176 #endif  /* __i386__ */
 177
 178 #if defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__)) && !defined(_WIN32) && !defined(__APPLE__) && !defined(__ANDROID__)
 179 #define __ASM_OBSOLETE(func) __asm__( ".symver " #func "_obsolete," #func "@WINE_1.0" )
 180 #else
 181 #undef __ASM_OBSOLETE
 182 #endif
 183
 184 #endif  /* __WINE_WINE_ASM_H */