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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.
69 lines
2.6 KiB
C++
69 lines
2.6 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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#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 SharedBufferRegion final : public SoftMMU::Region {
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public:
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static NonnullOwnPtr<SharedBufferRegion> create_with_shbuf_id(u32 base, u32 size, int shbuf_id, u8* shbuf_data);
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virtual ~SharedBufferRegion() override;
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virtual ValueWithShadow<u8> read8(u32 offset) override;
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virtual ValueWithShadow<u16> read16(u32 offset) override;
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virtual ValueWithShadow<u32> read32(u32 offset) override;
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virtual ValueWithShadow<u64> read64(u32 offset) override;
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virtual void write8(u32 offset, ValueWithShadow<u8>) override;
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virtual void write16(u32 offset, ValueWithShadow<u16>) override;
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virtual void write32(u32 offset, ValueWithShadow<u32>) override;
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virtual void write64(u32 offset, ValueWithShadow<u64>) override;
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u8* data() { return m_data; }
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bool is_shared_buffer() const override { return true; }
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int shbuf_id() const { return m_shbuf_id; }
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int allow_all();
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int allow_pid(pid_t);
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int seal();
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int release();
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int set_volatile(bool);
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private:
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SharedBufferRegion(u32 base, u32 size, int shbuf_id, u8* shbuf_data);
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u8* m_data { nullptr };
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u8* m_shadow_data { nullptr };
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int m_shbuf_id { 0 };
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};
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}
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