lib/clear_cache.c

   1 /* ===-- clear_cache.c - Implement __clear_cache ---------------------------===
   2  *
   3  *                     The LLVM Compiler Infrastructure
   4  *
   5  * This file is dual licensed under the MIT and the University of Illinois Open
   6  * Source Licenses. See LICENSE.TXT for details.
   7  *
   8  * ===----------------------------------------------------------------------===
   9  */
  10
  11 #include "int_lib.h"
  12
  13 #if __APPLE__
  14   #include <libkern/OSCacheControl.h>
  15 #endif
  16
  17 /*
  18  * The compiler generates calls to __clear_cache() when creating
  19  * trampoline functions on the stack for use with nested functions.
  20  * It is expected to invalidate the instruction cache for the
  21  * specified range.
  22  */
  23
  24 void __clear_cache(void* start, void* end)
  25 {
  26 #if __i386__ || __x86_64__
  27 /*
  28  * Intel processors have a unified instruction and data cache
  29  * so there is nothing to do
  30  */
  31 #else
  32     #if __APPLE__
  33         /* On Darwin, sys_icache_invalidate() provides this functionality */
  34         sys_icache_invalidate(start, end-start);
  35     #else
  36         compilerrt_abort();
  37     #endif
  38 #endif
  39 }
  40