05a7f14f8d
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@10950 a1c6a512-1295-4272-9138-f99709370657
176 lines
3.5 KiB
C
176 lines
3.5 KiB
C
/*
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* Copyright (C) 1996-1998 Szeredi Miklos
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* Email: mszeredi@inf.bme.hu
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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; either version 2 of the License, or
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* (at your option) any later version. See the file COPYING.
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*
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* This program 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 this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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#include "z80_def.h"
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byte z80c_incf_tbl[256];
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byte z80c_decf_tbl[256];
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byte z80c_addf_tbl[256];
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byte z80c_subf_tbl[256];
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byte z80c_orf_tbl[256];
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void PRNM(pushpc)(void)
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{
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#ifdef PROCP
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Z80 *z80p;
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z80p = &PRNM(proc);
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#endif
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SP--;
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PUTMEM(SP, SPP, PCH);
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SP--;
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PUTMEM(SP, SPP, PCL);
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}
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static int parity(int b)
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{
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int i;
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int par;
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par = 0;
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for(i = 8; i; i--) par ^= (b & 1), b >>= 1;
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return par;
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}
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void PRNM(local_init)(void)
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{
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int i;
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#ifdef PROCP
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Z80 *z80p;
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z80p = &PRNM(proc);
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#endif
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for(i = 0; i < 0x100; i++) {
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z80c_incf_tbl[i] = z80c_decf_tbl[i] = z80c_orf_tbl[i] = 0;
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z80c_orf_tbl[i] |= i & (SF | B3F | B5F);
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z80c_incf_tbl[i] |= i & (SF | B3F | B5F);
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z80c_decf_tbl[i] |= i & (SF | B3F | B5F);
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if(!parity(i)) z80c_orf_tbl[i] |= PVF;
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}
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z80c_incf_tbl[0] |= ZF;
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z80c_decf_tbl[0] |= ZF;
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z80c_orf_tbl[0] |= ZF;
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z80c_incf_tbl[0x80] |= PVF;
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z80c_decf_tbl[0x7F] |= PVF;
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for(i = 0; i < 0x100; i++) {
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int cr, c1, c2;
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int hr, h1, h2;
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int b5r;
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cr = i & 0x80;
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c1 = i & 0x40;
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b5r = i & 0x20;
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c2 = i & 0x10;
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hr = i & 0x08;
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h1 = i & 0x04;
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h2 = i & 0x01;
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z80c_addf_tbl[i] = 0;
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z80c_subf_tbl[i] = 0;
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if(cr) {
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z80c_addf_tbl[i] |= SF;
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z80c_subf_tbl[i] |= SF;
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}
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if(b5r) {
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z80c_addf_tbl[i] |= B5F;
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z80c_subf_tbl[i] |= B5F;
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}
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if(hr) {
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z80c_addf_tbl[i] |= B3F;
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z80c_subf_tbl[i] |= B3F;
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}
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if((c1 && c2) || (!cr && (c1 || c2))) z80c_addf_tbl[i] |= CF;
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if((h1 && h2) || (!hr && (h1 || h2))) z80c_addf_tbl[i] |= HF;
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if((!c1 && !c2 && cr) || (c1 && c2 && !cr)) z80c_addf_tbl[i] |= PVF;
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if((c2 && cr) || (!c1 && (c2 || cr))) z80c_subf_tbl[i] |= CF;
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if((h2 && hr) || (!h1 && (h2 || hr))) z80c_subf_tbl[i] |= HF;
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if((!c2 && !cr && c1) || (c2 && cr && !c1)) z80c_subf_tbl[i] |= PVF;
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z80c_subf_tbl[i] |= NF;
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}
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#ifdef PROCP
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TAB(incf_tbl) = z80c_incf_tbl;
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TAB(decf_tbl) = z80c_decf_tbl;
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TAB(addf_tbl) = z80c_addf_tbl;
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TAB(subf_tbl) = z80c_subf_tbl;
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TAB(orf_tbl) = z80c_orf_tbl;
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PORT(inports) = PRNM(inports);
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PORT(outports) = PRNM(outports);
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#ifdef SPECT_MEM
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SPECP(fe_inport_high) = SPNM(fe_inport_high);
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#endif
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#endif
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}
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int PRNM(step)(int tc)
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{
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#ifdef PROCP
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Z80 *z80p;
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z80p = &PRNM(proc);
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#endif
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DANM(tc) = tc;
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DANM(rl7) = RR & 0x80;
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if(DANM(haltstate)) {
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register int nn;
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nn = (DANM(tc) - 1) / 4 + 1;
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DANM(tc) -= 4 * nn;
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RR += nn;
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}
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else do {
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register int nextop;
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#ifdef DEBUG_Z80
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debug_z80();
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#endif
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nextop = *PCP;
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PC++;
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#ifdef PROCP
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z80p = (*z80c_op_tab[nextop])(z80p);
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#else
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(*z80c_op_tab[nextop])();
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#endif
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RR++;
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} while(DANM(tc) > 0);
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RR = (RR & 0x7F) | DANM(rl7);
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return DANM(tc);
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}
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