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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.
129 lines
4.4 KiB
C++
129 lines
4.4 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 "ValueWithShadow.h"
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#include <AK/HashMap.h>
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#include <AK/NonnullOwnPtrVector.h>
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#include <AK/OwnPtr.h>
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#include <AK/Types.h>
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#include <LibX86/Instruction.h>
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namespace UserspaceEmulator {
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class SharedBufferRegion;
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class SoftMMU {
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public:
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class Region {
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public:
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virtual ~Region() { }
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u32 base() const { return m_base; }
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u32 size() const { return m_size; }
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u32 end() const { return m_base + m_size; }
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bool contains(u32 address) const { return address >= base() && address < end(); }
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virtual void write8(u32 offset, ValueWithShadow<u8>) = 0;
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virtual void write16(u32 offset, ValueWithShadow<u16>) = 0;
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virtual void write32(u32 offset, ValueWithShadow<u32>) = 0;
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virtual void write64(u32 offset, ValueWithShadow<u64>) = 0;
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virtual ValueWithShadow<u8> read8(u32 offset) = 0;
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virtual ValueWithShadow<u16> read16(u32 offset) = 0;
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virtual ValueWithShadow<u32> read32(u32 offset) = 0;
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virtual ValueWithShadow<u64> read64(u32 offset) = 0;
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virtual u8* cacheable_ptr([[maybe_unused]] u32 offset) { return nullptr; }
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virtual bool is_shared_buffer() const { return false; }
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virtual bool is_mmap() const { return false; }
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bool is_stack() const { return m_stack; }
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void set_stack(bool b) { m_stack = b; }
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bool is_text() const { return m_text; }
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void set_text(bool b) { m_text = b; }
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protected:
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Region(u32 base, u32 size)
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: m_base(base)
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, m_size(size)
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{
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}
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private:
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u32 m_base { 0 };
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u32 m_size { 0 };
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bool m_stack { false };
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bool m_text { false };
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};
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ValueWithShadow<u8> read8(X86::LogicalAddress);
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ValueWithShadow<u16> read16(X86::LogicalAddress);
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ValueWithShadow<u32> read32(X86::LogicalAddress);
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ValueWithShadow<u64> read64(X86::LogicalAddress);
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void write8(X86::LogicalAddress, ValueWithShadow<u8>);
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void write16(X86::LogicalAddress, ValueWithShadow<u16>);
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void write32(X86::LogicalAddress, ValueWithShadow<u32>);
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void write64(X86::LogicalAddress, ValueWithShadow<u64>);
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Region* find_region(X86::LogicalAddress);
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void add_region(NonnullOwnPtr<Region>);
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void remove_region(Region&);
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void set_tls_region(NonnullOwnPtr<Region>);
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void copy_to_vm(FlatPtr destination, const void* source, size_t);
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void copy_from_vm(void* destination, const FlatPtr source, size_t);
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ByteBuffer copy_buffer_from_vm(const FlatPtr source, size_t);
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SharedBufferRegion* shbuf_region(int shbuf_id);
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template<typename Callback>
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void for_each_region(Callback callback)
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{
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if (m_tls_region) {
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if (callback(*m_tls_region) == IterationDecision::Break)
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return;
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}
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for (auto& region : m_regions) {
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if (callback(region) == IterationDecision::Break)
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return;
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}
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}
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private:
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OwnPtr<Region> m_tls_region;
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NonnullOwnPtrVector<Region> m_regions;
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HashMap<int, Region*> m_shbuf_regions;
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};
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}
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