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jamieiles |
// Copyright Jamie Iles, 2017
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//
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// This file is part of s80x86.
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//
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// s80x86 is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// s80x86 is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with s80x86. If not, see <http://www.gnu.org/licenses/>.
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// mov m/r, r (8-bit)
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void EmulatorPimpl::mov88()
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{
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modrm_decoder->set_width(OP_WIDTH_8);
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modrm_decoder->decode();
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auto source = modrm_decoder->reg();
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auto val = registers->get(source);
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write_data<uint8_t>(val);
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}
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// mov m/r, r (16-bit)
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void EmulatorPimpl::mov89()
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{
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modrm_decoder->set_width(OP_WIDTH_16);
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modrm_decoder->decode();
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auto source = modrm_decoder->reg();
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auto val = registers->get(source);
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write_data<uint16_t>(val);
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}
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// mov r, m/r (8-bit)
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void EmulatorPimpl::mov8a()
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{
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modrm_decoder->set_width(OP_WIDTH_8);
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modrm_decoder->decode();
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uint8_t val = read_data<uint8_t>();
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auto dest = modrm_decoder->reg();
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registers->set(dest, val);
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}
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// mov r, m/r (16-bit)
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void EmulatorPimpl::mov8b()
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{
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modrm_decoder->set_width(OP_WIDTH_16);
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modrm_decoder->decode();
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uint16_t val = read_data<uint16_t>();
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auto dest = modrm_decoder->reg();
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registers->set(dest, val);
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}
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// mov r/m, immediate (reg == 0), 8-bit
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void EmulatorPimpl::movc6()
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{
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modrm_decoder->set_width(OP_WIDTH_8);
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modrm_decoder->decode();
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if (modrm_decoder->raw_reg() == 0) {
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uint8_t immed = fetch_byte();
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write_data<uint8_t>(immed);
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}
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}
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// mov r/m, immediate (reg == 0), 16-bit
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void EmulatorPimpl::movc7()
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{
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modrm_decoder->set_width(OP_WIDTH_16);
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modrm_decoder->decode();
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if (modrm_decoder->raw_reg() == 0)
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write_data<uint16_t>(fetch_16bit());
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}
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// mov r, immediate, 8-bit
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void EmulatorPimpl::movb0_b7()
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{
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uint8_t immed = fetch_byte();
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auto reg = static_cast<GPR>(static_cast<int>(AL) + (opcode & 0x7));
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registers->set(reg, immed);
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}
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// mov r, immediate, 16-bit
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void EmulatorPimpl::movb8_bf()
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{
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uint16_t immed = fetch_16bit();
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auto reg = static_cast<GPR>(static_cast<int>(AX) + (opcode & 0x7));
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registers->set(reg, immed);
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}
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// mov al, m, 8-bit
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void EmulatorPimpl::mova0()
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{
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auto displacement = fetch_16bit();
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auto addr = get_phys_addr(registers->get(get_segment(false)), displacement);
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auto val = mem->read<uint8_t>(addr);
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registers->set(AL, val);
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}
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// mov ax, m, 16-bit
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void EmulatorPimpl::mova1()
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{
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auto displacement = fetch_16bit();
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auto addr = get_phys_addr(registers->get(get_segment(false)), displacement);
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auto val = mem->read<uint16_t>(addr);
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registers->set(AX, val);
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}
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// mov m, al 8-bit
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void EmulatorPimpl::mova2()
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{
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auto displacement = fetch_16bit();
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auto val = registers->get(AL);
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auto addr = get_phys_addr(registers->get(get_segment(false)), displacement);
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mem->write<uint8_t>(addr, val);
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}
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// mov m, al 16-bit
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void EmulatorPimpl::mova3()
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{
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auto displacement = fetch_16bit();
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auto val = registers->get(AX);
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auto addr = get_phys_addr(registers->get(get_segment(false)), displacement);
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mem->write<uint16_t>(addr, val);
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}
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// mov sr, r/m
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void EmulatorPimpl::mov8e()
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{
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modrm_decoder->set_width(OP_WIDTH_16);
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modrm_decoder->decode();
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uint16_t val = read_data<uint16_t>();
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auto segnum = modrm_decoder->raw_reg() & 0x3;
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auto reg = static_cast<GPR>(static_cast<int>(ES) + segnum);
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registers->set(reg, val);
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ext_int_inhibit = true;
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}
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// mov r/m, sr
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void EmulatorPimpl::mov8c()
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{
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modrm_decoder->set_width(OP_WIDTH_16);
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modrm_decoder->decode();
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auto segnum = modrm_decoder->raw_reg() & 0x3;
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auto reg = static_cast<GPR>(static_cast<int>(ES) + segnum);
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uint16_t val = registers->get(reg);
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write_data<uint16_t>(val);
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}
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