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UserspaceEmulator: Make mmap'ed memory track read/write protection
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. :^)
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5 changed files with 190 additions and 1 deletions
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DevTools/UserspaceEmulator/MmapRegion.h
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58
DevTools/UserspaceEmulator/MmapRegion.h
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/*
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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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#pragma once
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#include "SoftMMU.h"
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#include <sys/mman.h>
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namespace UserspaceEmulator {
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class MmapRegion final : public SoftMMU::Region {
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public:
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MmapRegion(u32 base, u32 size, int prot);
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virtual ~MmapRegion() override;
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virtual u8 read8(u32 offset) override;
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virtual u16 read16(u32 offset) override;
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virtual u32 read32(u32 offset) override;
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virtual void write8(u32 offset, u8 value) override;
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virtual void write16(u32 offset, u16 value) override;
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virtual void write32(u32 offset, u32 value) override;
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u8* data() { return m_data; }
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bool is_readable() const { return m_prot & PROT_READ; }
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bool is_writable() const { return m_prot & PROT_WRITE; }
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bool is_executable() const { return m_prot & PROT_EXEC; }
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private:
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u8* m_data { nullptr };
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int m_prot { 0 };
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};
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}
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