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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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void EmulatorPimpl::sbb18()
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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 v1 = read_data<uint8_t>();
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uint8_t v2 = registers->get(modrm_decoder->reg());
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bool carry_in = !!(registers->get_flags() & CF);
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uint8_t result;
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uint16_t flags;
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std::tie(flags, result) = do_sub<uint8_t>(v1, v2, carry_in);
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registers->set_flags(flags, OF | SF | ZF | CF | PF | AF);
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write_data<uint8_t>(result & 0xff);
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}
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// sbb r, r/m, 16-bit
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void EmulatorPimpl::sbb19()
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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 v1 = read_data<uint16_t>();
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uint16_t v2 = registers->get(modrm_decoder->reg());
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bool carry_in = !!(registers->get_flags() & CF);
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uint16_t result;
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uint16_t flags;
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std::tie(flags, result) = do_sub<uint16_t>(v1, v2, carry_in);
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registers->set_flags(flags, OF | SF | ZF | CF | PF | AF);
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write_data<uint16_t>(result & 0xffff);
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}
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// sbb r/m, r, 8-bit
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void EmulatorPimpl::sbb1a()
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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 v1 = read_data<uint8_t>();
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uint8_t v2 = registers->get(modrm_decoder->reg());
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bool carry_in = !!(registers->get_flags() & CF);
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uint8_t result;
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uint16_t flags;
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std::tie(flags, result) = do_sub<uint8_t>(v2, v1, carry_in);
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registers->set_flags(flags, OF | SF | ZF | CF | PF | AF);
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registers->set(modrm_decoder->reg(), result & 0xff);
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}
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// sbb r/m, r, 16-bit
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void EmulatorPimpl::sbb1b()
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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 v1 = read_data<uint16_t>();
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uint16_t v2 = registers->get(modrm_decoder->reg());
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bool carry_in = !!(registers->get_flags() & CF);
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uint16_t result;
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uint16_t flags;
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std::tie(flags, result) = do_sub<uint16_t>(v2, v1, carry_in);
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registers->set_flags(flags, OF | SF | ZF | CF | PF | AF);
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registers->set(modrm_decoder->reg(), result & 0xffff);
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}
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void EmulatorPimpl::sbb1c()
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{
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auto v1 = registers->get(AL);
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auto v2 = fetch_byte();
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bool carry_in = !!(registers->get_flags() & CF);
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uint8_t result;
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uint16_t flags;
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std::tie(flags, result) = do_sub<uint8_t>(v1, v2, carry_in);
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registers->set_flags(flags, OF | SF | ZF | CF | PF | AF);
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registers->set(AL, result);
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}
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void EmulatorPimpl::sbb1d()
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{
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auto v1 = registers->get(AX);
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auto v2 = fetch_16bit();
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bool carry_in = !!(registers->get_flags() & CF);
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uint16_t result;
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uint16_t flags;
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std::tie(flags, result) = do_sub<uint16_t>(v1, v2, carry_in);
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registers->set_flags(flags, OF | SF | ZF | CF | PF | AF);
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registers->set(AX, result);
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}
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