src/resolver.c

   1 /*
   2  * Copyright (c) 2015 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_APACHE_LICENSE_HEADER_START@
   5  *
   6  * Licensed under the Apache License, Version 2.0 (the "License");
   7  * you may not use this file except in compliance with the License.
   8  * You may obtain a copy of the License at
   9  *
  10  *     http://www.apache.org/licenses/LICENSE-2.0
  11  *
  12  * Unless required by applicable law or agreed to in writing, software
  13  * distributed under the License is distributed on an "AS IS" BASIS,
  14  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  15  * See the License for the specific language governing permissions and
  16  * limitations under the License.
  17  *
  18  * @APPLE_APACHE_LICENSE_HEADER_END@
  19  */
  20
  21 #include "resolver_internal.h"
  22
  23 #define _OS_VARIANT_RESOLVER(s, v, ...) \
  24         __attribute__((visibility(OS_STRINGIFY(v)))) extern void* s(void); \
  25         void* s(void) { \
  26         __asm__(".symbol_resolver _" OS_STRINGIFY(s)); \
  27                 __VA_ARGS__ \
  28         }
  29
  30 #define _OS_VARIANT_UPMP_RESOLVER(s, v) \
  31         _OS_VARIANT_RESOLVER(s, v, \
  32                 uint32_t *_c = (void*)(uintptr_t)_COMM_PAGE_CPU_CAPABILITIES; \
  33                 if (*_c & kUP) { \
  34                         extern void OS_VARIANT(s, up)(void); \
  35                         return &OS_VARIANT(s, up); \
  36                 } else { \
  37                         extern void OS_VARIANT(s, mp)(void); \
  38                         return &OS_VARIANT(s, mp); \
  39                 })
  40
  41 #define OS_VARIANT_UPMP_RESOLVER(s) \
  42         _OS_VARIANT_UPMP_RESOLVER(s, default)
  43
  44 #define OS_VARIANT_UPMP_RESOLVER_INTERNAL(s) \
  45         _OS_VARIANT_UPMP_RESOLVER(s, hidden)
  46
  47
  48 #ifdef OS_VARIANT_SELECTOR
  49
  50 OS_VARIANT_UPMP_RESOLVER(pthread_mutex_lock)
  51 OS_VARIANT_UPMP_RESOLVER(pthread_mutex_trylock)
  52 OS_VARIANT_UPMP_RESOLVER(pthread_mutex_unlock)
  53
  54 #endif // OS_VARIANT_SELECTOR