2 * Copyright (C) 2008 Apple Inc. All rights reserved.
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
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.
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.
26 #include "ExecutableAllocator.h"
28 #if ENABLE_ASSEMBLER && WTF_PLATFORM_UNIX && !WTF_PLATFORM_SYMBIAN
32 #include <wtf/VMTags.h>
36 void ExecutableAllocator::intializePageSize()
38 ExecutableAllocator::pageSize = getpagesize();
41 ExecutablePool::Allocation ExecutablePool::systemAlloc(size_t n)
43 void* allocation = mmap(NULL, n, INITIAL_PROTECTION_FLAGS, MAP_PRIVATE | MAP_ANON, VM_TAG_FOR_EXECUTABLEALLOCATOR_MEMORY, 0);
44 if (allocation == MAP_FAILED)
46 ExecutablePool::Allocation alloc = { reinterpret_cast<char*>(allocation), n };
50 void ExecutablePool::systemRelease(const ExecutablePool::Allocation& alloc)
52 int result = munmap(alloc.pages, alloc.size);
53 ASSERT_UNUSED(result, !result);
56 #if WTF_ENABLE_ASSEMBLER_WX_EXCLUSIVE
57 void ExecutableAllocator::reprotectRegion(void* start, size_t size, ProtectionSeting setting)
62 // Calculate the start of the page containing this region,
63 // and account for this extra memory within size.
64 intptr_t startPtr = reinterpret_cast<intptr_t>(start);
65 intptr_t pageStartPtr = startPtr & ~(pageSize - 1);
66 void* pageStart = reinterpret_cast<void*>(pageStartPtr);
67 size += (startPtr - pageStartPtr);
70 size += (pageSize - 1);
71 size &= ~(pageSize - 1);
73 mprotect(pageStart, size, (setting == Writable) ? PROTECTION_FLAGS_RW : PROTECTION_FLAGS_RX);
77 #if WTF_CPU_ARM_TRADITIONAL && WTF_PLATFORM_LINUX && WTF_COMPILER_RVCT
78 __asm void ExecutableAllocator::cacheFlush(void* code, size_t size)
94 #endif // HAVE(ASSEMBLER)