jit/ExecutableAllocatorPosix.cpp

   1 /*
   2  * Copyright (C) 2008 Apple Inc. All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  *
  13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
  14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
  17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #include "config.h"
  27
  28 #include "ExecutableAllocator.h"
  29
  30 #if ENABLE(EXECUTABLE_ALLOCATOR_DEMAND) && !OS(WINDOWS) && !OS(SYMBIAN)
  31
  32 #include <sys/mman.h>
  33 #include <unistd.h>
  34 #include <wtf/VMTags.h>
  35
  36 namespace JSC {
  37
  38 void ExecutableAllocator::intializePageSize()
  39 {
  40     ExecutableAllocator::pageSize = getpagesize();
  41 }
  42
  43 ExecutablePool::Allocation ExecutablePool::systemAlloc(size_t n)
  44 {
  45     void* allocation = mmap(NULL, n, INITIAL_PROTECTION_FLAGS, MAP_PRIVATE | MAP_ANON, VM_TAG_FOR_EXECUTABLEALLOCATOR_MEMORY, 0);
  46     if (allocation == MAP_FAILED)
  47         CRASH();
  48     ExecutablePool::Allocation alloc = { reinterpret_cast<char*>(allocation), n };
  49     return alloc;
  50 }
  51
  52 void ExecutablePool::systemRelease(const ExecutablePool::Allocation& alloc)
  53 {
  54     int result = munmap(alloc.pages, alloc.size);
  55     ASSERT_UNUSED(result, !result);
  56 }
  57
  58 bool ExecutableAllocator::isValid() const
  59 {
  60     return true;
  61 }
  62
  63 #if CPU(ARM_TRADITIONAL) && OS(LINUX) && COMPILER(RVCT)
  64 __asm void ExecutableAllocator::cacheFlush(void* code, size_t size)
  65 {
  66     ARM
  67     push {r7}
  68     add r1, r1, r0
  69     mov r7, #0xf0000
  70     add r7, r7, #0x2
  71     mov r2, #0x0
  72     svc #0x0
  73     pop {r7}
  74     bx lr
  75 }
  76 #endif
  77
  78 }
  79
  80 #endif