65 lines
3.2 KiB
C
65 lines
3.2 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/flags.h"
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bool GetParity(uint8_t b) {
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b ^= b >> 4;
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b ^= b >> 2;
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b ^= b >> 1;
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return ~b & 1;
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}
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void ImportFlags(struct Machine *m, uint64_t flags) {
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uint64_t old, mask = 0;
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mask |= 1u << FLAGS_CF;
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mask |= 1u << FLAGS_PF;
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mask |= 1u << FLAGS_AF;
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mask |= 1u << FLAGS_ZF;
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mask |= 1u << FLAGS_SF;
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mask |= 1u << FLAGS_TF;
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mask |= 1u << FLAGS_IF;
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mask |= 1u << FLAGS_DF;
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mask |= 1u << FLAGS_OF;
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mask |= 1u << FLAGS_NT;
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mask |= 1u << FLAGS_AC;
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mask |= 1u << FLAGS_ID;
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m->flags = (flags & mask) | (m->flags & ~mask);
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m->flags = SetFlag(m->flags, FLAGS_RF, false);
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m->flags = SetLazyParityByte(m->flags, !((m->flags >> FLAGS_PF) & 1));
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}
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uint64_t ExportFlags(uint64_t flags) {
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flags = SetFlag(flags, FLAGS_IOPL, 3);
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flags = SetFlag(flags, FLAGS_F1, true);
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flags = SetFlag(flags, FLAGS_F0, false);
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flags = flags & ~(1ull << FLAGS_PF);
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flags |= GetLazyParityBool(flags) << FLAGS_PF;
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return flags;
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}
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int64_t AluFlags(uint64_t x, uint32_t af, uint32_t *f, uint32_t of, uint32_t cf,
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uint32_t sf) {
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*f &= ~(1u << FLAGS_CF | 1u << FLAGS_ZF | 1u << FLAGS_SF | 1u << FLAGS_OF |
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1u << FLAGS_AF | 0xFF000000u);
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*f |= sf << FLAGS_SF | cf << FLAGS_CF | !x << FLAGS_ZF | of << FLAGS_OF |
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af << FLAGS_AF | (x & 0xFF) << 24;
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return x;
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}
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