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/*
z80 - Z80 emulation
Copyright (C) 2021 Ian Cowburn (ianc@noddybox.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 3 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, see <http://www.gnu.org/licenses/>
-------------------------------------------------------------------------
$Id$
Private macros for Z80
*/
#ifndef Z80_PRIVATE_H
#define Z80_PRIVATE_H "$Id$"
#include "z80_config.h"
#ifndef TRUE
#define TRUE 1
#endif
#ifndef FALSE
#define FALSE 0
#endif
#define MAX_PER_CALLBACK 10
/* ---------------------------------------- TYPES
*/
struct Z80Private
{
Z80Val cycle;
Z80Val timer[Z80_NO_TIMERS];
int halt;
Z80Byte shift;
int raise;
Z80Byte devbyte;
int nmi;
#ifndef ENABLE_ARRAY_MEMORY
Z80ReadMemory disread;
Z80ReadMemory mread;
Z80WriteMemory mwrite;
#endif
Z80ReadPort pread;
Z80WritePort pwrite;
Z80Callback callback[eZ80_NO_CALLBACK][MAX_PER_CALLBACK];
int last_cb;
Z80Reg memptr;
};
#define PRIV cpu->priv
/* ---------------------------------------- ARRAY MEMORY
*/
#ifdef ENABLE_ARRAY_MEMORY
extern Z80Byte Z80_MEMORY[];
#endif
/* ---------------------------------------- MACROS
*/
/* NOTE: A lot of these macros assume you have a variable called 'cpu'
which is a pointer to Z80
*/
/* Invoke a callback class
*/
#define CALLBACK(r,d) do \
{ \
int f; \
\
for(f=0;f<MAX_PER_CALLBACK;f++) \
if (PRIV->callback[r][f]) \
PRIV->last_cb &= \
PRIV->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 HIDDEN_Z80 (B3_Z80|B5_Z80)
#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)
#ifdef ENABLE_ARRAY_MEMORY
#define PEEK(addr) Z80_MEMORY[addr]
/* This can't be a macro as the macro is used as PEEKW(FETCH_WORD)
*/
static inline Z80Word PEEKW(Z80Word addr)
{
return (PEEK(addr) | (Z80Word)PEEK(addr+1)<<8);
}
#define POKE(addr,val) do \
{ \
Z80Word ba=addr; \
if (ba>=RAMBOT && ba<=RAMTOP) \
Z80_MEMORY[ba]=val; \
} while(0)
#define POKEW(addr,val) do \
{ \
Z80Word wa=addr; \
Z80Word wv=val; \
POKE(wa,wv); \
POKE(wa+1,wv>>8); \
} while(0)
#define FETCH_BYTE (Z80_MEMORY[cpu->PC++])
#define FETCH_WORD (cpu->PC+=2, \
Z80_MEMORY[cpu->PC-2]| \
((Z80Word)Z80_MEMORY[cpu->PC-1]<<8))
#else
#define PEEK(addr) (PRIV->mread(cpu,addr))
#define PEEKW(addr) FPEEKW(cpu,addr)
#define POKE(addr,val) PRIV->mwrite(cpu,addr,val)
#define POKEW(addr,val) FPOKEW(cpu,addr,val)
#define FETCH_BYTE (PRIV->mread(cpu,cpu->PC++))
#define FETCH_WORD (cpu->PC+=2,FPEEKW(cpu,cpu->PC-2))
#endif
#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 IS_IX_IY (PRIV->shift==0xdd || PRIV->shift==0xfd)
#define OFFSET(base,off) do \
{ \
if (IS_IX_IY) \
{ \
off=(Z80Relative)FETCH_BYTE; \
PRIV->memptr.w=base+off; \
} \
else \
{ \
off=0; \
} \
} while(0)
#define TSTATE(n) do \
{ \
PRIV->cycle+=n; \
PRIV->timer[Z80_TIMER_1]+=n; \
PRIV->timer[Z80_TIMER_2]+=n; \
PRIV->timer[Z80_TIMER_3]+=n; \
} while(0)
#define ADD_R(v) cpu->R=((cpu->R&0x80)|((cpu->R+(v))&0x7f))
#define INC_R ADD_R(1)
#ifdef ENABLE_ARRAY_MEMORY
#define PUSH(REG) do \
{ \
Z80Word pv=REG; \
cpu->SP-=2; \
POKE(cpu->SP,pv); \
POKE(cpu->SP+1,pv>>8); \
} while(0)
#else
#define PUSH(REG) do \
{ \
Z80Word pushv=REG; \
cpu->SP-=2; \
PRIV->mwrite(cpu,cpu->SP,pushv); \
PRIV->mwrite(cpu,cpu->SP+1,pushv>>8);\
} while(0)
#endif
#define POP(REG) do \
{ \
REG=PEEK(cpu->SP) | \
(Z80Word)PEEK(cpu->SP+1)<<8; \
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); \
PRIV->memptr.w=cpu->PC; \
} while(0)
#define NOCALL cpu->PC+=2
#define JP do \
{ \
cpu->PC=PEEKW(cpu->PC); \
PRIV->memptr.w=cpu->PC; \
} while(0)
#define NOJP NOCALL
#define JR do \
{ \
cpu->PC+=(Z80Relative)PEEK(cpu->PC)+1; \
PRIV->memptr.w=cpu->PC; \
} while(0)
#define NOJR cpu->PC++
#define OUT(P,V) do \
{ \
if (PRIV->pwrite) \
PRIV->pwrite(cpu,P,V); \
} while(0)
#define IN(P) (PRIV->pread?PRIV->pread(cpu,P):0)
/* ---------------------------------------- LABELS
*/
extern Z80Label *z80_labels;
/* ---------------------------------------- GLOBAL GENERAL OPCODES/ROUTINES
*/
void Z80_Decode(Z80 *cpu, Z80Byte opcode);
void Z80_InitialiseInternals(void);
/* ---------------------------------------- DISASSEMBLY
*/
#ifdef ENABLE_DISASSEM
typedef void (*DIS_OP_CALLBACK)(Z80 *z80, Z80Byte op, Z80Word *pc);
extern DIS_OP_CALLBACK dis_CB_opcode[];
extern DIS_OP_CALLBACK dis_DD_opcode[];
extern DIS_OP_CALLBACK dis_DD_CB_opcode[];
extern DIS_OP_CALLBACK dis_ED_opcode[];
extern DIS_OP_CALLBACK dis_FD_opcode[];
extern DIS_OP_CALLBACK dis_FD_CB_opcode[];
extern DIS_OP_CALLBACK dis_opcode_z80[];
const char *Z80_Dis_Printf(const char *format, ...);
Z80Byte Z80_Dis_FetchByte(Z80 *cpu, Z80Word *pc);
Z80Word Z80_Dis_FetchWord(Z80 *cpu, Z80Word *pc);
void Z80_Dis_Set(const char *op, const char *arg);
const char *Z80_Dis_GetOp(void);
const char *Z80_Dis_GetArg(void);
#endif /* ENABLE_DISASSEM */
#endif /* Z80_PRIVATE_H */
/* END OF FILE */
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