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https://github.com/RGBCube/serenity
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734f63d522
The SoftMMU now receives full X86::LogicalAddress values from SoftCPU. This allows the MMU to reroute TLS accesses to a special memory region. The ELF executable's PT_TLS header tells us how to allocate the TLS. Basically, the GS register points to a magical 4-byte area which has a pointer to the TCB (thread control block). The TCB lives in normal flat memory space and is accessed through the DS register.
122 lines
3.7 KiB
C++
122 lines
3.7 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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#include "SoftMMU.h"
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namespace UserspaceEmulator {
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SoftMMU::Region* SoftMMU::find_region(X86::LogicalAddress address)
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{
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if (address.selector() == 0x28)
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return m_tls_region.ptr();
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for (auto& region : m_regions) {
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if (region.contains(address.offset()))
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return ®ion;
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}
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return nullptr;
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}
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void SoftMMU::add_region(NonnullOwnPtr<Region> region)
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{
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ASSERT(!find_region({ 0x20, region->base() }));
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// FIXME: More sanity checks pls
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m_regions.append(move(region));
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}
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void SoftMMU::set_tls_region(NonnullOwnPtr<Region> region)
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{
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ASSERT(!m_tls_region);
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m_tls_region = move(region);
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}
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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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warn() << "SoftMMU::read8: No region for @" << (const void*)address.offset();
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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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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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warn() << "SoftMMU::read16: No region for @" << (const void*)address.offset();
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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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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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warn() << "SoftMMU::read32: No region for @" << (const void*)address.offset();
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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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void SoftMMU::write8(X86::LogicalAddress address, 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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warn() << "SoftMMU::write8: No region for @" << (const void*)address.offset();
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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, 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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warn() << "SoftMMU::write16: No region for @" << (const void*)address.offset();
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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, 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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warn() << "SoftMMU::write32: No region for @" << (const void*)address.offset();
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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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}
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