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