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https://github.com/RGBCube/serenity
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8d8bb07476
This introduces a new X86 CPU emulator for running SerenityOS userspace programs in a virtualized interpreter environment. The main goal is to be able to instrument memory accesses and catch interesting bugs that are very hard to find otherwise. But before we can do fancy things like that, we have to build a competent emulator able to actually run programs. This initial version is able to run a very small program that makes some tiny syscalls, but nothing more.
89 lines
2.6 KiB
C++
89 lines
2.6 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 "Emulator.h"
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#include "SoftCPU.h"
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#include <AK/LogStream.h>
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#include <Kernel/API/Syscall.h>
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#include <unistd.h>
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#include <stdio.h>
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namespace UserspaceEmulator {
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Emulator::Emulator()
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: m_cpu(*this)
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{
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}
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int Emulator::exec(X86::SimpleInstructionStream& stream, u32 base)
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{
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size_t offset = 0;
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while (!m_shutdown) {
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auto insn = X86::Instruction::from_stream(stream, true, true);
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out() << "instruction: " << insn.to_string(base + offset);
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(m_cpu.*insn.handler())(insn);
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m_cpu.dump();
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offset += insn.length();
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if (insn.mnemonic() == "RET")
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break;
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}
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return m_exit_status;
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}
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u32 Emulator::virt_syscall(u32 function, u32 arg1, u32 arg2, u32 arg3)
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{
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(void) arg2;
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(void) arg3;
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printf("Syscall: %s (%x)\n", Syscall::to_string((Syscall::Function)function), function);
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switch (function) {
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case SC_getuid:
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return virt$getuid();
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case SC_exit:
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virt$exit((int)arg1);
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return 0;
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default:
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warn() << "Unimplemented syscall!";
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TODO();
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}
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}
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uid_t Emulator::virt$getuid()
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{
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return getuid();
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}
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void Emulator::virt$exit(int status)
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{
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out() << "exit(" << status << "), shutting down!";
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m_exit_status = status;
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m_shutdown = true;
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}
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}
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