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https://github.com/LadybirdBrowser/ladybird.git
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c1d6637dc7
... segment This happens with binaries build with Clang or with a custom linker script. If this is the case, offsets should be calculated not from the base address of `.text`, but from the first section loaded for the library. This commit moves all UserspaceEmulator symbolication into a common helper function and fixes a FIXME.
116 lines
3.6 KiB
C++
116 lines
3.6 KiB
C++
/*
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* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include "Region.h"
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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 Emulator;
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class SoftMMU {
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public:
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explicit SoftMMU(Emulator&);
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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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ValueWithShadow<u128> read128(X86::LogicalAddress);
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ValueWithShadow<u256> read256(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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void write128(X86::LogicalAddress, ValueWithShadow<u128>);
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void write256(X86::LogicalAddress, ValueWithShadow<u256>);
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ALWAYS_INLINE Region* find_region(X86::LogicalAddress address)
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{
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if (address.selector() == 0x2b)
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return m_tls_region.ptr();
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size_t page_index = address.offset() / PAGE_SIZE;
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return m_page_to_region_map[page_index];
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}
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void add_region(NonnullOwnPtr<Region>);
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void remove_region(Region&);
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void ensure_split_at(X86::LogicalAddress);
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void set_tls_region(NonnullOwnPtr<Region>);
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bool fast_fill_memory8(X86::LogicalAddress, size_t size, ValueWithShadow<u8>);
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bool fast_fill_memory32(X86::LogicalAddress, size_t size, ValueWithShadow<u32>);
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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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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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template<typename Type, typename Callback>
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void for_each_region_of_type(Callback callback)
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{
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return for_each_region([callback](auto& region) {
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if (!is<Type>(region))
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return IterationDecision::Continue;
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return callback(static_cast<Type&>(region));
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});
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}
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template<typename Callback>
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void for_regions_in(X86::LogicalAddress address, size_t size, Callback callback)
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{
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VERIFY(size > 0);
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X86::LogicalAddress address_end = address;
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address_end.set_offset(address_end.offset() + size);
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ensure_split_at(address);
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ensure_split_at(address_end);
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size_t first_page = address.offset() / PAGE_SIZE;
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size_t last_page = (address_end.offset() - 1) / PAGE_SIZE;
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Region* last_reported = nullptr;
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for (size_t page = first_page; page <= last_page; ++page) {
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Region* current_region = m_page_to_region_map[page];
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if (page != first_page && current_region == last_reported)
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continue;
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if (callback(current_region) == IterationDecision::Break)
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return;
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last_reported = current_region;
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}
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}
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private:
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Emulator& m_emulator;
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Region* m_page_to_region_map[786432] = { nullptr };
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OwnPtr<Region> m_tls_region;
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NonnullOwnPtrVector<Region> m_regions;
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};
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}
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