internal/os/internal_asm.h

   1 /*
   2  * Copyright (c) 2013 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28
  29 #ifndef __INTERNAL_ASM_H__
  30 #define __INTERNAL_ASM_H__
  31
  32 #include <machine/cpu_capabilities.h>
  33
  34 #define OS_STRINGIFY1(s) #s
  35 #define OS_STRINGIFY(s) OS_STRINGIFY1(s)
  36 #define OS_CONCAT1(x, y) x ## y
  37 #define OS_CONCAT(x, y) OS_CONCAT1(x, y)
  38
  39 #ifdef  __ASSEMBLER__
  40 #define OS_VARIANT(f, v) OS_CONCAT(_, OS_CONCAT(f, OS_CONCAT($VARIANT$, v)))
  41 #else
  42 #define OS_VARIANT(f, v) OS_CONCAT(f, OS_CONCAT($VARIANT$, v))
  43 #endif
  44
  45 #if defined(__ASSEMBLER__)
  46
  47 #if defined(__i386__) || defined(__x86_64__)
  48
  49 #define OS_VARIANT_FUNCTION_START(name, variant, alignment) \
  50         .text ; \
  51         .align alignment, 0x90 ; \
  52         .private_extern OS_VARIANT(name, variant) ; \
  53         OS_VARIANT(name, variant) ## :
  54
  55 // GENERIC indicates that this function will be chosen as the generic
  56 // implementation (at compile time) when building targets which do not
  57 // support dyld variant resolves.
  58 #if defined(VARIANT_NO_RESOLVERS) || defined(VARIANT_DYLD)
  59 #define OS_VARIANT_FUNCTION_START_GENERIC(name, variant, alignment) \
  60         OS_VARIANT_FUNCTION_START(name, variant, alignment) \
  61         .globl _ ## name ; \
  62         _ ## name ## :
  63 #else
  64 #define OS_VARIANT_FUNCTION_START_GENERIC OS_VARIANT_FUNCTION_START
  65 #endif
  66
  67 #define OS_ATOMIC_FUNCTION_START(name, alignment) \
  68         .text ; \
  69         .align alignment, 0x90 ; \
  70         .globl _ ## name ; \
  71         _ ## name ## :
  72
  73 #endif // defined(__i386__) || defined(__x86_64__)
  74
  75 #endif // defined(__ASSEMBLER__)
  76
  77 #endif // __INTERNAL_ASM_H__