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UserspaceEmulator: Make mmap'ed memory track read/write protection

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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. :^)
This commit is contained in:
Andreas Kling 2020-07-13 11:40:21 +02:00
parent 27c1690504
commit f6ad5edab0
5 changed files with 190 additions and 1 deletions
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58
DevTools/UserspaceEmulator/MmapRegion.h Normal file
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/*
* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
* 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 THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 THE COPYRIGHT HOLDER 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.
*/
#pragma once
#include "SoftMMU.h"
#include <sys/mman.h>
namespace UserspaceEmulator {
class MmapRegion final : public SoftMMU::Region {
public:
MmapRegion(u32 base, u32 size, int prot);
virtual ~MmapRegion() override;
virtual u8 read8(u32 offset) override;
virtual u16 read16(u32 offset) override;
virtual u32 read32(u32 offset) override;
virtual void write8(u32 offset, u8 value) override;
virtual void write16(u32 offset, u16 value) override;
virtual void write32(u32 offset, u32 value) override;
u8* data() { return m_data; }
bool is_readable() const { return m_prot & PROT_READ; }
bool is_writable() const { return m_prot & PROT_WRITE; }
bool is_executable() const { return m_prot & PROT_EXEC; }
private:
u8* m_data { nullptr };
int m_prot { 0 };
};
}