mirror of
https://github.com/RGBCube/serenity
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f1c0f661f4
This is useful for reading and writing doubles for #3329. It is also useful for emulating 64-bit binaries. MemoryOrRegisterReference assumes that 64-bit values are always memory references since that's enough for fpu support. If we ever want to emulate 64-bit binaries, that part will need minor updating.
103 lines
3.5 KiB
C++
103 lines
3.5 KiB
C++
/*
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* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "SimpleRegion.h"
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#include <string.h>
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namespace UserspaceEmulator {
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SimpleRegion::SimpleRegion(u32 base, u32 size)
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: Region(base, size)
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{
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m_data = (u8*)calloc(1, size);
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m_shadow_data = (u8*)malloc(size);
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memset(m_shadow_data, 1, size);
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}
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SimpleRegion::~SimpleRegion()
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{
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free(m_shadow_data);
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free(m_data);
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}
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ValueWithShadow<u8> SimpleRegion::read8(FlatPtr offset)
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{
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ASSERT(offset < size());
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return { *reinterpret_cast<const u8*>(m_data + offset), *reinterpret_cast<const u8*>(m_shadow_data + offset) };
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}
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ValueWithShadow<u16> SimpleRegion::read16(u32 offset)
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{
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ASSERT(offset + 1 < size());
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return { *reinterpret_cast<const u16*>(m_data + offset), *reinterpret_cast<const u16*>(m_shadow_data + offset) };
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}
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ValueWithShadow<u32> SimpleRegion::read32(u32 offset)
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{
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ASSERT(offset + 3 < size());
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return { *reinterpret_cast<const u32*>(m_data + offset), *reinterpret_cast<const u32*>(m_shadow_data + offset) };
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}
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ValueWithShadow<u64> SimpleRegion::read64(u32 offset)
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{
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ASSERT(offset + 7 < size());
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return { *reinterpret_cast<const u64*>(m_data + offset), *reinterpret_cast<const u64*>(m_shadow_data + offset) };
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}
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void SimpleRegion::write8(u32 offset, ValueWithShadow<u8> value)
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{
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ASSERT(offset < size());
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*reinterpret_cast<u8*>(m_data + offset) = value.value();
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*reinterpret_cast<u8*>(m_shadow_data + offset) = value.shadow();
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}
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void SimpleRegion::write16(u32 offset, ValueWithShadow<u16> value)
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{
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ASSERT(offset + 1 < size());
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*reinterpret_cast<u16*>(m_data + offset) = value.value();
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*reinterpret_cast<u16*>(m_shadow_data + offset) = value.shadow();
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}
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void SimpleRegion::write32(u32 offset, ValueWithShadow<u32> value)
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{
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ASSERT(offset + 3 < size());
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*reinterpret_cast<u32*>(m_data + offset) = value.value();
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*reinterpret_cast<u32*>(m_shadow_data + offset) = value.shadow();
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}
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void SimpleRegion::write64(u32 offset, ValueWithShadow<u64> value)
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{
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ASSERT(offset + 7 < size());
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*reinterpret_cast<u64*>(m_data + offset) = value.value();
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*reinterpret_cast<u64*>(m_shadow_data + offset) = value.shadow();
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}
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u8* SimpleRegion::cacheable_ptr(u32 offset)
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{
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return m_data + offset;
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}
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}
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