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/*
z80 - Z80 emulation
Copyright (C) 2006 Ian Cowburn (ianc@noddybox.demon.co.uk)
This program 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.
This program 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 this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
-------------------------------------------------------------------------
$Id$
Private macros for Z80
*/
#ifndef Z80_PRIVATE_H
#define Z80_PRIVATE_H "$Id$"
#ifndef TRUE
#define TRUE 1
#endif
#ifndef FALSE
#define FALSE 0
#endif
#define MAX_PER_CALLBACK 10
/* ---------------------------------------- TYPES
*/
typedef union
{
Z80Word w;
Z80Byte b[2];
} Z80Reg;
struct Z80
{
Z80Val cycle;
Z80Word PC;
Z80Reg AF;
Z80Reg BC;
Z80Reg DE;
Z80Reg HL;
Z80Reg AF_;
Z80Reg BC_;
Z80Reg DE_;
Z80Reg HL_;
Z80Reg IX;
Z80Reg IY;
Z80Word SP;
Z80Byte IFF1;
Z80Byte IFF2;
Z80Byte IM;
Z80Byte I;
Z80Byte R;
int halt;
int use_cb_off;
Z80Relative cb_off;
Z80Byte shift;
int raise;
Z80Byte devbyte;
int nmi;
Z80Byte *memory;
int *memctrl;
Z80ReadPort pread;
Z80WritePort pwrite;
Z80Callback callback[eZ80_NO_CALLBACK][MAX_PER_CALLBACK];
int last_cb;
};
/* ---------------------------------------- MACROS
*/
/* NOTE: A lot of these macros assume you have a variable called 'cpu'
which is a pointer to Z80
*/
/* HI/LO
*/
#define SET_HI(reg,v) reg = (reg & 0x00ff) | ((v) << 8)
#define SET_LO(reg,v) reg = (reg & 0xff00) | ((v) & 0xff)
#define GET_HI(reg,v) ((reg & 0xff00) >> 8)
#define GET_LO(reg,v) (reg & 0xff)
/* Invoke a callback class
*/
#define CALLBACK(r,d) do \
{ \
int f; \
\
for(f=0;f<MAX_PER_CALLBACK;f++) \
if (cpu->callback[r][f]) \
cpu->callback[r][f](cpu,d); \
} while(0)
/* Flag register
*/
#define C_Z80 0x01
#define N_Z80 0x02
#define P_Z80 0x04
#define V_Z80 P_Z80
#define H_Z80 0x10
#define Z_Z80 0x40
#define S_Z80 0x80
#define B3_Z80 0x08
#define B5_Z80 0x20
#define SET(v,b) v|=b
#define CLR(v,b) v&=~(b)
#define SETFLAG(f) SET(cpu->AF.b[LO],f)
#define CLRFLAG(f) CLR(cpu->AF.b[LO],f)
#define PEEK(addr) (cpu->memory[addr])
#define PEEKW(addr) (PEEK(addr) | (Z80Word)PEEK(addr+1)<<8)
#define POKE(addr,val) do \
{ \
if (cpu->memctrl[(addr)/256]) \
{ \
cpu->memory[addr]=val; \
} \
} while (0)
#define POKEW(addr,val) do \
{ \
Z80Word once=val; \
POKE(addr,once); \
POKE(addr+1,once>>8); \
} while(0)
#define FETCH_BYTE (cpu->memory[cpu->PC++])
#define FETCH_WORD (cpu->PC+=2, \
cpu->memory[cpu->PC-2]| \
((Z80Word)cpu->memory[cpu->PC-1]<<8))
#define IS_C (cpu->AF.b[LO]&C_Z80)
#define IS_N (cpu->AF.b[LO]&N_Z80)
#define IS_P (cpu->AF.b[LO]&P_Z80)
#define IS_H (cpu->AF.b[LO]&H_Z80)
#define IS_Z (cpu->AF.b[LO]&Z_Z80)
#define IS_S (cpu->AF.b[LO]&S_Z80)
#define CARRY IS_C
#define TSTATE(n) cpu->cycle+=n
#define ADD_R(v) cpu->R=((cpu->R&0x80)|((cpu->R+(v))&0x7f))
#define INC_R ADD_R(1)
#define PUSH(REG) do \
{ \
cpu->SP-=2; \
POKEW(cpu->SP,REG); \
} while(0)
#define POP(REG) do \
{ \
REG=PEEKW(cpu->SP); \
cpu->SP+=2; \
} while(0)
#define SETHIDDEN(res) cpu->AF.b[LO]=(cpu->AF.b[LO]&~(B3_Z80|B5_Z80))|\
((res)&(B3_Z80|B5_Z80))
#define CALL do \
{ \
PUSH(cpu->PC+2); \
cpu->PC=PEEKW(cpu->PC); \
} while(0)
#define NOCALL cpu->PC+=2
#define JP cpu->PC=PEEKW(cpu->PC)
#define NOJP cpu->PC+=2
#define JR cpu->PC+=(Z80Relative)PEEK(cpu->PC)+1
#define NOJR cpu->PC++
#define IN(PORT) (cpu->pread ? cpu->pread(cpu,PORT) : 0)
#define OUT(PORT,VAL) if (cpu->pwrite) \
{ \
cpu->pwrite(cpu,PORT,VAL); \
}
/* ---------------------------------------- FLAG TABLES
*/
extern Z80Byte PSZtable[512];
extern Z80Byte SZtable[512];
extern Z80Byte Ptable[512];
extern Z80Byte Stable[512];
extern Z80Byte Ztable[512];
/* ---------------------------------------- GLOBAL GENERAL OPCODES/ROUTINES
*/
void Z80_Decode(Z80 *cpu, Z80Byte opcode);
void Z80_InitialiseInternals(void);
#endif
/* END OF FILE */
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