79 lines
3.5 KiB
C
79 lines
3.5 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ This program 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; version 2 of the License. │
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│ │
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│ This program is distributed in the hope that it will be useful, but │
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│ WITHOUT ANY WARRANTY; without even the implied warranty of │
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│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
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│ 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 this program; if not, write to the Free Software │
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│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
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│ 02110-1301 USA │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "tool/build/lib/alu.h"
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#include "tool/build/lib/bcd.h"
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#include "tool/build/lib/endian.h"
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#include "tool/build/lib/flags.h"
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#include "tool/build/lib/throw.h"
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relegated void OpDas(struct Machine *m, uint32_t rde) {
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uint8_t al, af, cf;
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af = cf = 0;
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al = m->ax[0];
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if ((al & 0x0f) > 9 || GetFlag(m->flags, FLAGS_AF)) {
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cf = m->ax[0] < 6 || GetFlag(m->flags, FLAGS_CF);
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m->ax[0] -= 0x06;
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af = 1;
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}
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if (al > 0x99 || GetFlag(m->flags, FLAGS_CF)) {
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m->ax[0] -= 0x60;
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cf = 1;
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}
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AluFlags8(m->ax[0], af, &m->flags, 0, cf);
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}
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relegated void OpAaa(struct Machine *m, uint32_t rde) {
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uint8_t af, cf;
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af = cf = 0;
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if ((m->ax[0] & 0x0f) > 9 || GetFlag(m->flags, FLAGS_AF)) {
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cf = m->ax[0] < 6 || GetFlag(m->flags, FLAGS_CF);
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Write16(m->ax, Read16(m->ax) + 0x106);
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af = cf = 1;
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}
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m->ax[0] &= 0x0f;
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AluFlags8(m->ax[0], af, &m->flags, 0, cf);
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}
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relegated void OpAas(struct Machine *m, uint32_t rde) {
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uint8_t af, cf;
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af = cf = 0;
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if ((m->ax[0] & 0x0f) > 9 || GetFlag(m->flags, FLAGS_AF)) {
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cf = m->ax[0] < 6 || GetFlag(m->flags, FLAGS_CF);
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Write16(m->ax, Read16(m->ax) - 0x106);
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af = cf = 1;
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}
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m->ax[0] &= 0x0f;
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AluFlags8(m->ax[0], af, &m->flags, 0, cf);
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}
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relegated void OpAam(struct Machine *m, uint32_t rde) {
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uint8_t i = m->xedd->op.uimm0;
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if (!i) ThrowDivideError(m);
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m->ax[1] = m->ax[0] / i;
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m->ax[0] = m->ax[0] % i;
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AluFlags8(m->ax[0], 0, &m->flags, 0, 0);
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}
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relegated void OpAad(struct Machine *m, uint32_t rde) {
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uint8_t i = m->xedd->op.uimm0;
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Write16(m->ax, (m->ax[1] * i + m->ax[0]) & 0xff);
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AluFlags8(m->ax[0], 0, &m->flags, 0, 0);
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}
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