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f6ad5edab0
Here's the first time we get a taste of better information than the real hardware can give us: unlike x86 CPUs, we can actually support write-only memory, so now we do! While this isn't immediately useful, it's still pretty cool. :^)
117 lines
3.5 KiB
C++
117 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 "MmapRegion.h"
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#include "Emulator.h"
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#include <sys/mman.h>
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namespace UserspaceEmulator {
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MmapRegion::MmapRegion(u32 base, u32 size, int prot)
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: Region(base, size)
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, m_prot(prot)
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{
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m_data = (u8*)calloc(1, size);
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}
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MmapRegion::~MmapRegion()
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{
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free(m_data);
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}
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u8 MmapRegion::read8(FlatPtr offset)
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{
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if (!is_readable()) {
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warn() << "8-bit read from unreadable MmapRegion @ " << (const void*)(base() + offset);
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Emulator::the().dump_backtrace();
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TODO();
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}
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ASSERT(offset < size());
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return *reinterpret_cast<const u8*>(m_data + offset);
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}
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u16 MmapRegion::read16(u32 offset)
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{
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if (!is_readable()) {
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warn() << "16-bit from unreadable MmapRegion @ " << (const void*)(base() + offset);
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Emulator::the().dump_backtrace();
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TODO();
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}
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ASSERT(offset + 1 < size());
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return *reinterpret_cast<const u16*>(m_data + offset);
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}
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u32 MmapRegion::read32(u32 offset)
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{
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if (!is_readable()) {
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warn() << "32-bit read from unreadable MmapRegion @ " << (const void*)(base() + offset);
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Emulator::the().dump_backtrace();
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TODO();
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}
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ASSERT(offset + 3 < size());
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return *reinterpret_cast<const u32*>(m_data + offset);
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}
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void MmapRegion::write8(u32 offset, u8 value)
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{
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if (!is_writable()) {
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warn() << "8-bit write to unreadable MmapRegion @ " << (const void*)(base() + offset);
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Emulator::the().dump_backtrace();
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TODO();
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}
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ASSERT(offset < size());
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*reinterpret_cast<u8*>(m_data + offset) = value;
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}
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void MmapRegion::write16(u32 offset, u16 value)
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{
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if (!is_writable()) {
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warn() << "16-bit write to unreadable MmapRegion @ " << (const void*)(base() + offset);
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Emulator::the().dump_backtrace();
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TODO();
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}
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ASSERT(offset + 1 < size());
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*reinterpret_cast<u16*>(m_data + offset) = value;
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}
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void MmapRegion::write32(u32 offset, u32 value)
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{
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if (!is_writable()) {
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warn() << "32-bit write to unreadable MmapRegion @ " << (const void*)(base() + offset);
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Emulator::the().dump_backtrace();
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TODO();
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}
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ASSERT(offset + 3 < size());
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*reinterpret_cast<u32*>(m_data + offset) = value;
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}
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}
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