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/*
* Simulator of microcontrollers (regsz80.h)
*
* some z80 code base from Karl Bongers karl@turbobit.com
*
* Copyright (C) 1999,99 Drotos Daniel, Talker Bt.
*
* To contact author send email to drdani@mazsola.iit.uni-miskolc.hu
*
*/
/* This file is part of microcontroller simulator: ucsim.
UCSIM 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 2 of the License, or
(at your option) any later version.
UCSIM 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 UCSIM; see the file COPYING. If not, write to the Free
Software Foundation, 59 Temple Place - Suite 330, Boston, MA
02111-1307, USA. */
/*@1@*/
#ifndef REGSZ80_HEADER
#define REGSZ80_HEADER
#include "ddconfig.h"
struct t_regpair
{
#ifdef WORDS_BIGENDIAN
u8_t/*TYPE_UBYTE*/ h;
u8_t/*TYPE_UBYTE*/ l;
#else
u8_t/*TYPE_UBYTE*/ l;
u8_t/*TYPE_UBYTE*/ h;
#endif
};
#define DEF_REGPAIR(BIGNAME,smallname) \
union { \
u16_t/*TYPE_UWORD*/ BIGNAME; \
struct t_regpair smallname; \
}
struct t_regs
{
//TYPE_UBYTE A;
//TYPE_UBYTE F;
union {
u16_t AF;
struct {
#ifdef WORDS_BIGENDIAN
u8_t/*TYPE_UBYTE*/ A;
u8_t/*TYPE_UBYTE*/ F;
#else
u8_t/*TYPE_UBYTE*/ F;
u8_t/*TYPE_UBYTE*/ A;
#endif
} raf;
};
DEF_REGPAIR(BC, bc);
DEF_REGPAIR(DE, de);
DEF_REGPAIR(HL, hl);
DEF_REGPAIR(IX, ix);
DEF_REGPAIR(IY, iy);
u16_t/*TYPE_UWORD*/ SP;
/* there are alternate AF,BC,DE,HL register sets, and a few instructions
that swap one for the other */
//TYPE_UBYTE aA;
//TYPE_UBYTE aF;
union {
u16_t aAF;
struct {
#ifdef WORDS_BIGENDIAN
u8_t/*TYPE_UBYTE*/ aA;
u8_t/*TYPE_UBYTE*/ aF;
#else
u8_t/*TYPE_UBYTE*/ aF;
u8_t/*TYPE_UBYTE*/ aA;
#endif
} ralt_af;
};
DEF_REGPAIR(aBC, a_bc);
DEF_REGPAIR(aDE, a_de);
DEF_REGPAIR(aHL, a_hl);
u8_t/*TYPE_UBYTE*/ iv; /* interrupt vector, see ed 47 ld A,IV.. */
};
enum {
BIT_C= 0x01, // carry status(out of bit 7)
BIT_N= 0x02, // Not addition: subtract status(1 after subtract).
BIT_P= 0x04, // parity/overflow, 1=even, 0=odd parity. arith:1=overflow
BIT_A= 0x10, // aux carry status(out of bit 3)
BIT_Z= 0x40, // zero status, 1=zero, 0=nonzero
BIT_S= 0x80, // sign status(value of bit 7)
BIT_ALL= (BIT_C |BIT_N |BIT_P |BIT_A |BIT_Z |BIT_S) // all bits
};
enum {
BITPOS_C= 0, // 1
BITPOS_SUB= 1, // 2H
BITPOS_P= 2, // 4H
BITPOS_A= 4, // 10H
BITPOS_Z= 6, // 40H
BITPOS_S= 7 // 80H
};
#endif
/* End of z80.src/regsz80.h */
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