libsyscall/os/tsd.h

   1 /*
   2  * Copyright (c) 2012 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 OS_TSD_H
  30 #define OS_TSD_H
  31
  32 #include <stdint.h>
  33
  34 /* The low nine slots of the TSD are reserved for libsyscall usage. */
  35 #define __TSD_RESERVED_BASE 0
  36 #define __TSD_RESERVED_MAX 9
  37
  38 #define __TSD_THREAD_SELF 0
  39 #define __TSD_ERRNO 1
  40 #define __TSD_MIG_REPLY 2
  41 #define __TSD_SEMAPHORE_CACHE 9
  42
  43
  44 __attribute__((always_inline))
  45 static __inline__ unsigned int
  46 _os_cpu_number(void)
  47 {
  48         /* Not yet implemented */
  49         return 0;
  50 }
  51
  52 __attribute__((always_inline))
  53 static __inline__ void*
  54 _os_tsd_get_direct(unsigned long slot)
  55 {
  56         void *ret;
  57 #if defined(__i386__) || defined(__x86_64__)
  58         __asm__("mov %%gs:%1, %0" : "=r" (ret) : "m" (*(void **)(slot * sizeof(void *))));
  59 #endif
  60
  61
  62         return ret;
  63 }
  64
  65 __attribute__((always_inline))
  66 static __inline__ int
  67 _os_tsd_set_direct(unsigned long slot, void* val)
  68 {
  69 #if defined(__i386__) && defined(__PIC__)
  70         __asm__("movl %1, %%gs:%0" : "=m" (*(void **)(slot * sizeof(void *))) : "rn" (val));
  71 #elif defined(__i386__) && !defined(__PIC__)
  72         __asm__("movl %1, %%gs:%0" : "=m" (*(void **)(slot * sizeof(void *))) : "ri" (val));
  73 #elif defined(__x86_64__)
  74         __asm__("movq %1, %%gs:%0" : "=m" (*(void **)(slot * sizeof(void *))) : "rn" (val));
  75 #endif
  76
  77         return 0;
  78 }
  79
  80 #endif