| /* |
| * Copyright (C) 2008 Apple Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY |
| * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR |
| * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
| * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include "config.h" |
| |
| #include "ExecutableAllocator.h" |
| |
| #if ENABLE(ASSEMBLER) |
| |
| namespace JSC { |
| |
| size_t ExecutableAllocator::pageSize = 0; |
| |
| #if ENABLE(ASSEMBLER_WX_EXCLUSIVE) |
| void ExecutableAllocator::reprotectRegion(void* start, size_t size, ProtectionSeting setting) |
| { |
| if (!pageSize) |
| intializePageSize(); |
| |
| // Calculate the start of the page containing this region, |
| // and account for this extra memory within size. |
| intptr_t startPtr = reinterpret_cast<intptr_t>(start); |
| intptr_t pageStartPtr = startPtr & ~(pageSize - 1); |
| void* pageStart = reinterpret_cast<void*>(pageStartPtr); |
| size += (startPtr - pageStartPtr); |
| |
| // Round size up |
| size += (pageSize - 1); |
| size &= ~(pageSize - 1); |
| |
| mprotect(pageStart, size, (setting == Writable) ? PROTECTION_FLAGS_RW : PROTECTION_FLAGS_RX); |
| } |
| #endif |
| |
| } |
| |
| #endif // HAVE(ASSEMBLER) |
