/*

 * 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

#if CPU(ARM_TRADITIONAL) && OS(LINUX) && COMPILER(RVCT)

__asm void ExecutableAllocator::cacheFlush(void* code, size_t size)

{

    ARM

    push {r7}

    add r1, r1, r0

    mov r7, #0xf0000

    add r7, r7, #0x2

    mov r2, #0x0

    svc #0x0

    pop {r7}

    bx lr

}

#endif

}

#endif // HAVE(ASSEMBLER)