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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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// push r/m
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void EmulatorPimpl::pushff()
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{
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assert(modrm_decoder->raw_reg() == 6);
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registers->set(SP, registers->get(SP) - 2);
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auto val = read_data<uint16_t>();
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auto addr = get_phys_addr(registers->get(SS), registers->get(SP));
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mem->write<uint16_t>(addr, val);
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}
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// push imm16
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void EmulatorPimpl::push68()
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{
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auto val = fetch_16bit();
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registers->set(SP, registers->get(SP) - 2);
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auto addr = get_phys_addr(registers->get(SS), registers->get(SP));
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mem->write<uint16_t>(addr, val);
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}
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// push imm8
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void EmulatorPimpl::push6a()
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{
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auto val = sign_extend<int16_t, uint8_t>(fetch_byte());
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registers->set(SP, registers->get(SP) - 2);
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auto addr = get_phys_addr(registers->get(SS), registers->get(SP));
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mem->write<uint16_t>(addr, val);
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}
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// push r
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void EmulatorPimpl::push50_57()
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{
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auto reg = static_cast<GPR>(static_cast<int>(AX) + (opcode & 0x7));
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registers->set(SP, registers->get(SP) - 2);
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auto val = registers->get(reg);
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auto addr = get_phys_addr(registers->get(SS), registers->get(SP));
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mem->write<uint16_t>(addr, val);
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}
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// push sr
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void EmulatorPimpl::pushsr()
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{
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auto reg = static_cast<GPR>(static_cast<int>(ES) + ((opcode >> 3) & 0x3));
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auto val = registers->get(reg);
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registers->set(SP, registers->get(SP) - 2);
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auto addr = get_phys_addr(registers->get(SS), registers->get(SP));
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mem->write<uint16_t>(addr, val);
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}
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// pushf
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void EmulatorPimpl::pushf9c()
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{
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auto val = registers->get_flags();
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registers->set(SP, registers->get(SP) - 2);
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auto addr = get_phys_addr(registers->get(SS), registers->get(SP));
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mem->write<uint16_t>(addr, val);
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}
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void EmulatorPimpl::pusha60()
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{
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auto sp = registers->get(SP);
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push_word(registers->get(AX));
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push_word(registers->get(CX));
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push_word(registers->get(DX));
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push_word(registers->get(BX));
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push_word(sp);
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push_word(registers->get(BP));
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push_word(registers->get(SI));
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push_word(registers->get(DI));
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}
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void EmulatorPimpl::popa61()
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{
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registers->set(DI, pop_word());
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registers->set(SI, pop_word());
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registers->set(BP, pop_word());
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pop_word();
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registers->set(BX, pop_word());
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registers->set(DX, pop_word());
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registers->set(CX, pop_word());
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registers->set(AX, pop_word());
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}
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