mirror of
https://github.com/RGBCube/serenity
synced 2025-10-31 19:22:45 +00:00
384 lines
12 KiB
C++
384 lines
12 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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#include "SoftMMU.h"
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#include "Emulator.h"
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#include "MmapRegion.h"
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#include "Report.h"
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#include <AK/ByteBuffer.h>
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#include <AK/Memory.h>
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#include <AK/QuickSort.h>
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namespace UserspaceEmulator {
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SoftMMU::SoftMMU(Emulator& emulator)
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: m_emulator(emulator)
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{
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}
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void SoftMMU::add_region(NonnullOwnPtr<Region> region)
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{
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VERIFY(!find_region({ 0x23, region->base() }));
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size_t first_page_in_region = region->base() / PAGE_SIZE;
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size_t last_page_in_region = (region->base() + region->size() - 1) / PAGE_SIZE;
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for (size_t page = first_page_in_region; page <= last_page_in_region; ++page) {
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m_page_to_region_map[page] = region.ptr();
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}
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m_regions.append(move(region));
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quick_sort((Vector<OwnPtr<Region>>&)m_regions, [](auto& a, auto& b) { return a->base() < b->base(); });
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}
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void SoftMMU::remove_region(Region& region)
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{
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size_t first_page_in_region = region.base() / PAGE_SIZE;
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for (size_t i = 0; i < ceil_div(region.size(), PAGE_SIZE); ++i) {
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m_page_to_region_map[first_page_in_region + i] = nullptr;
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}
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m_regions.remove_first_matching([&](auto& entry) { return entry.ptr() == ®ion; });
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}
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void SoftMMU::ensure_split_at(X86::LogicalAddress address)
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{
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// FIXME: If this fails, call Emulator::dump_backtrace
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VERIFY(address.selector() != 0x2b);
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u32 offset = address.offset();
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VERIFY((offset & (PAGE_SIZE - 1)) == 0);
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size_t page_index = address.offset() / PAGE_SIZE;
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if (!page_index)
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return;
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if (m_page_to_region_map[page_index - 1] != m_page_to_region_map[page_index])
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return;
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if (!m_page_to_region_map[page_index])
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return;
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// If we get here, we know that the page exists and belongs to a region, that there is
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// a previous page, and that it belongs to the same region.
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auto* old_region = verify_cast<MmapRegion>(m_page_to_region_map[page_index]);
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// dbgln("splitting at {:p}", address.offset());
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// dbgln(" old region: {:p}-{:p}", old_region->base(), old_region->end() - 1);
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NonnullOwnPtr<MmapRegion> new_region = old_region->split_at(VirtualAddress(offset));
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// dbgln(" new region: {:p}-{:p}", new_region->base(), new_region->end() - 1);
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// dbgln(" up old region: {:p}-{:p}", old_region->base(), old_region->end() - 1);
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size_t first_page_in_region = new_region->base() / PAGE_SIZE;
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size_t last_page_in_region = (new_region->base() + new_region->size() - 1) / PAGE_SIZE;
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// dbgln(" @ remapping pages {} thru {}", first_page_in_region, last_page_in_region);
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for (size_t page = first_page_in_region; page <= last_page_in_region; ++page) {
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VERIFY(m_page_to_region_map[page] == old_region);
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m_page_to_region_map[page] = new_region.ptr();
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}
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m_regions.append(move(new_region));
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quick_sort((Vector<OwnPtr<Region>>&)m_regions, [](auto& a, auto& b) { return a->base() < b->base(); });
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}
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void SoftMMU::set_tls_region(NonnullOwnPtr<Region> region)
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{
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VERIFY(!m_tls_region);
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m_tls_region = move(region);
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}
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ValueWithShadow<u8> SoftMMU::read8(X86::LogicalAddress address)
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{
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auto* region = find_region(address);
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if (!region) {
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reportln("SoftMMU::read8: No region for @ {:p}", address.offset());
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m_emulator.dump_backtrace();
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TODO();
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}
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if (!region->is_readable()) {
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reportln("SoftMMU::read8: Non-readable region @ {:p}", address.offset());
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m_emulator.dump_backtrace();
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TODO();
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}
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return region->read8(address.offset() - region->base());
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}
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ValueWithShadow<u16> SoftMMU::read16(X86::LogicalAddress address)
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{
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auto* region = find_region(address);
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if (!region) {
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reportln("SoftMMU::read16: No region for @ {:p}", address.offset());
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m_emulator.dump_backtrace();
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TODO();
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}
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if (!region->is_readable()) {
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reportln("SoftMMU::read16: Non-readable region @ {:p}", address.offset());
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m_emulator.dump_backtrace();
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TODO();
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}
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return region->read16(address.offset() - region->base());
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}
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ValueWithShadow<u32> SoftMMU::read32(X86::LogicalAddress address)
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{
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auto* region = find_region(address);
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if (!region) {
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reportln("SoftMMU::read32: No region for @ {:04x}:{:p}", address.selector(), address.offset());
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m_emulator.dump_backtrace();
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TODO();
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}
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if (!region->is_readable()) {
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reportln("SoftMMU::read32: Non-readable region @ {:p}", address.offset());
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m_emulator.dump_backtrace();
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TODO();
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}
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return region->read32(address.offset() - region->base());
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}
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ValueWithShadow<u64> SoftMMU::read64(X86::LogicalAddress address)
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{
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auto* region = find_region(address);
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if (!region) {
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reportln("SoftMMU::read64: No region for @ {:p}", address.offset());
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m_emulator.dump_backtrace();
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TODO();
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}
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if (!region->is_readable()) {
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reportln("SoftMMU::read64: Non-readable region @ {:p}", address.offset());
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m_emulator.dump_backtrace();
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TODO();
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}
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return region->read64(address.offset() - region->base());
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}
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ValueWithShadow<u128> SoftMMU::read128(X86::LogicalAddress address)
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{
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auto* region = find_region(address);
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if (!region) {
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reportln("SoftMMU::read128: No region for @ {:p}", address.offset());
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m_emulator.dump_backtrace();
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TODO();
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}
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if (!region->is_readable()) {
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reportln("SoftMMU::read128: Non-readable region @ {:p}", address.offset());
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m_emulator.dump_backtrace();
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TODO();
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}
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return region->read128(address.offset() - region->base());
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}
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ValueWithShadow<u256> SoftMMU::read256(X86::LogicalAddress address)
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{
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auto* region = find_region(address);
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if (!region) {
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reportln("SoftMMU::read256: No region for @ {:p}", address.offset());
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m_emulator.dump_backtrace();
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TODO();
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}
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if (!region->is_readable()) {
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reportln("SoftMMU::read256: Non-readable region @ {:p}", address.offset());
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m_emulator.dump_backtrace();
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TODO();
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}
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return region->read256(address.offset() - region->base());
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}
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void SoftMMU::write8(X86::LogicalAddress address, ValueWithShadow<u8> value)
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{
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auto* region = find_region(address);
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if (!region) {
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reportln("SoftMMU::write8: No region for @ {:p}", address.offset());
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m_emulator.dump_backtrace();
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TODO();
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}
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if (!region->is_writable()) {
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reportln("SoftMMU::write8: Non-writable region @ {:p}", address.offset());
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m_emulator.dump_backtrace();
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TODO();
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}
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region->write8(address.offset() - region->base(), value);
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}
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void SoftMMU::write16(X86::LogicalAddress address, ValueWithShadow<u16> value)
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{
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auto* region = find_region(address);
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if (!region) {
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reportln("SoftMMU::write16: No region for @ {:p}", address.offset());
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m_emulator.dump_backtrace();
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TODO();
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}
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if (!region->is_writable()) {
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reportln("SoftMMU::write16: Non-writable region @ {:p}", address.offset());
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m_emulator.dump_backtrace();
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TODO();
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}
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region->write16(address.offset() - region->base(), value);
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}
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void SoftMMU::write32(X86::LogicalAddress address, ValueWithShadow<u32> value)
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{
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auto* region = find_region(address);
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if (!region) {
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reportln("SoftMMU::write32: No region for @ {:p}", address.offset());
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m_emulator.dump_backtrace();
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TODO();
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}
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if (!region->is_writable()) {
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reportln("SoftMMU::write32: Non-writable region @ {:p}", address.offset());
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m_emulator.dump_backtrace();
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TODO();
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}
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region->write32(address.offset() - region->base(), value);
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}
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void SoftMMU::write64(X86::LogicalAddress address, ValueWithShadow<u64> value)
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{
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auto* region = find_region(address);
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if (!region) {
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reportln("SoftMMU::write64: No region for @ {:p}", address.offset());
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m_emulator.dump_backtrace();
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TODO();
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}
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if (!region->is_writable()) {
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reportln("SoftMMU::write64: Non-writable region @ {:p}", address.offset());
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m_emulator.dump_backtrace();
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TODO();
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}
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region->write64(address.offset() - region->base(), value);
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}
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void SoftMMU::write128(X86::LogicalAddress address, ValueWithShadow<u128> value)
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{
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auto* region = find_region(address);
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if (!region) {
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reportln("SoftMMU::write128: No region for @ {:p}", address.offset());
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m_emulator.dump_backtrace();
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TODO();
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}
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if (!region->is_writable()) {
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reportln("SoftMMU::write128: Non-writable region @ {:p}", address.offset());
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m_emulator.dump_backtrace();
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TODO();
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}
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region->write128(address.offset() - region->base(), value);
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}
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void SoftMMU::write256(X86::LogicalAddress address, ValueWithShadow<u256> value)
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{
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auto* region = find_region(address);
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if (!region) {
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reportln("SoftMMU::write256: No region for @ {:p}", address.offset());
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m_emulator.dump_backtrace();
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TODO();
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}
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if (!region->is_writable()) {
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reportln("SoftMMU::write256: Non-writable region @ {:p}", address.offset());
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m_emulator.dump_backtrace();
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TODO();
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}
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region->write256(address.offset() - region->base(), value);
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}
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void SoftMMU::copy_to_vm(FlatPtr destination, void const* source, size_t size)
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{
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// FIXME: We should have a way to preserve the shadow data here as well.
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for (size_t i = 0; i < size; ++i)
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write8({ 0x23, destination + i }, shadow_wrap_as_initialized(((u8 const*)source)[i]));
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}
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void SoftMMU::copy_from_vm(void* destination, const FlatPtr source, size_t size)
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{
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// FIXME: We should have a way to preserve the shadow data here as well.
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for (size_t i = 0; i < size; ++i)
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((u8*)destination)[i] = read8({ 0x23, source + i }).value();
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}
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ByteBuffer SoftMMU::copy_buffer_from_vm(const FlatPtr source, size_t size)
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{
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auto buffer = ByteBuffer::create_uninitialized(size).release_value_but_fixme_should_propagate_errors(); // FIXME: Handle possible OOM situation.
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copy_from_vm(buffer.data(), source, size);
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return buffer;
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}
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bool SoftMMU::fast_fill_memory8(X86::LogicalAddress address, size_t size, ValueWithShadow<u8> value)
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{
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if (!size)
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return true;
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auto* region = find_region(address);
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if (!region)
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return false;
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if (!region->contains(address.offset() + size - 1))
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return false;
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if (is<MmapRegion>(*region) && static_cast<MmapRegion const&>(*region).is_malloc_block()) {
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if (auto* tracer = m_emulator.malloc_tracer()) {
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// FIXME: Add a way to audit an entire range of memory instead of looping here!
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for (size_t i = 0; i < size; ++i) {
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tracer->audit_write(*region, address.offset() + (i * sizeof(u8)), sizeof(u8));
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}
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}
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}
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size_t offset_in_region = address.offset() - region->base();
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memset(region->data() + offset_in_region, value.value(), size);
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memset(region->shadow_data() + offset_in_region, value.shadow()[0], size);
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return true;
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}
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bool SoftMMU::fast_fill_memory32(X86::LogicalAddress address, size_t count, ValueWithShadow<u32> value)
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{
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if (!count)
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return true;
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auto* region = find_region(address);
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if (!region)
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return false;
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if (!region->contains(address.offset() + (count * sizeof(u32)) - 1))
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return false;
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if (is<MmapRegion>(*region) && static_cast<MmapRegion const&>(*region).is_malloc_block()) {
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if (auto* tracer = m_emulator.malloc_tracer()) {
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// FIXME: Add a way to audit an entire range of memory instead of looping here!
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for (size_t i = 0; i < count; ++i) {
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tracer->audit_write(*region, address.offset() + (i * sizeof(u32)), sizeof(u32));
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}
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}
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}
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size_t offset_in_region = address.offset() - region->base();
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fast_u32_fill((u32*)(region->data() + offset_in_region), value.value(), count);
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fast_u32_fill((u32*)(region->shadow_data() + offset_in_region), value.shadow_as_value(), count);
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return true;
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}
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void SoftMMU::dump_backtrace()
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{
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m_emulator.dump_backtrace();
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}
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}
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