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[/] [s80186/] [trunk/] [sim/] [cppmodel/] [instructions/] [imul.cpp] - Rev 2
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// Copyright Jamie Iles, 2017 // // This file is part of s80x86. // // s80x86 is free software: you can redistribute it and/or modify // it under the terms of the GNU General Public License as published by // the Free Software Foundation, either version 3 of the License, or // (at your option) any later version. // // s80x86 is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU General Public License for more details. // // You should have received a copy of the GNU General Public License // along with s80x86. If not, see <http://www.gnu.org/licenses/>. // imul r/m, 8-bit void EmulatorPimpl::imulf6() { auto old_flags = registers->get_flags(); int16_t v1 = sign_extend<int16_t, uint8_t>(read_data<uint8_t>()); int16_t v2 = sign_extend<int16_t, uint8_t>(registers->get(AL)); uint16_t result, flags; std::tie(flags, result) = do_mul<int16_t>(v1, v2); flags = old_flags & ~(CF | OF | ZF); if (result & 0xff00) flags |= CF | OF; registers->set(AX, result); registers->set_flags(flags, OF | CF | ZF); } // imul r/m, 16-bit void EmulatorPimpl::imulf7() { auto old_flags = registers->get_flags(); int32_t v1 = sign_extend<int32_t, uint16_t>(read_data<uint16_t>()); int32_t v2 = sign_extend<int32_t, uint16_t>(registers->get(AX)); uint32_t result; uint16_t flags; std::tie(flags, result) = do_mul<int32_t>(v1, v2); flags = old_flags & ~(CF | OF | ZF); if (result & 0xffff0000) flags |= CF | OF; registers->set(AX, result & 0xffff); registers->set(DX, (result >> 16) & 0xffff); registers->set_flags(flags, OF | CF | ZF); } // imul r/m, 16-bit immediate void EmulatorPimpl::imul69() { modrm_decoder->set_width(OP_WIDTH_16); modrm_decoder->decode(); auto old_flags = registers->get_flags(); int32_t v1 = sign_extend<int32_t, int16_t>(read_data<uint16_t>()); int32_t v2 = sign_extend<int32_t, int16_t>(fetch_16bit()); uint32_t result; uint16_t flags; std::tie(flags, result) = do_mul<int32_t>(v1, v2); flags = old_flags & ~(CF | OF | ZF); if (result & 0xffff0000) flags |= CF | OF; registers->set(modrm_decoder->reg(), result & 0xffff); registers->set_flags(flags, OF | CF | ZF); } // imul r/m, 8-bit immediate void EmulatorPimpl::imul6b() { modrm_decoder->set_width(OP_WIDTH_16); modrm_decoder->decode(); auto old_flags = registers->get_flags(); int32_t v1 = sign_extend<int32_t, int16_t>(read_data<uint16_t>()); int32_t v2 = sign_extend<int32_t, int8_t>(fetch_byte()); uint32_t result; uint16_t flags; std::tie(flags, result) = do_mul<int32_t>(v1, v2); flags = old_flags & ~(CF | OF | ZF); if (result & 0xffff0000) flags |= CF | OF; registers->set(modrm_decoder->reg(), result & 0xffff); registers->set_flags(flags, OF | CF | ZF); }