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https://github.com/RGBCube/serenity
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d0dbf92c8d
Until we learn more instructions, we'll have to exit somewhere, so let us exit when we hit a RET instruction for now.
90 lines
2.7 KiB
C++
90 lines
2.7 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 "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() << "\033[33;1m" << insn.to_string(base + offset) << "\033[0m";
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// FIXME: Remove this hack once it's no longer needed :^)
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if (insn.mnemonic() == "RET")
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break;
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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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}
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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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