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/* gb.h */
/*
* Copyright (C) 1989-2009 Alan R. Baldwin
*
* 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/>.
*
*
* Alan R. Baldwin
* 721 Berkeley St.
* Kent, Ohio 44240
*/
/* Gameboy mods by Roger Ivie (ivie at cc dot usu dot edu)
*
* The Gameboy mods are based on
* http://www.komkon.org/fms/GameBoy/Tech/Software.html
* by Marat Fayzullin
*
* The Gameboy is allegedly a Z80 with the following mods:
*
* - No index registers
* - No alternate registers
* - No I and R
* - No I/O instructions (all I/O is memory mapped)
* - No parity flag
* - No minus flag
* - No instructions with ED prefix (RETI is moved)
* - HALT is always interruptible, even if interrupts have been disabled.
* - The following instructions are different:
* - No ADC or SBC of r16s.
*
* ----------------------------------------------------------------------------
* Code Z80 operation GameBoy operation
* ----------------------------------------------------------------------------
* 08 xx xx EX AF,AF' LD (word),SP Save SP at given address
* 10 xx DJNZ offset STOP Meaning unknown
* 22 LD (word),HL LD (HLI),A Save A at (HL) and increment HL
* 2A LD HL,(word) LD A,(HLI) Load A from (HL) and increment HL
* 32 LD (word),A LD (HLD),A Save A at (HL) and decrement HL
* 3A LD A,(word) LD A,(HLD) Load A from (HL) and decrement HL
* D3 OUTA (byte) No operation
* D9 EXX RETI Enable interrupts and return
* DB INA (byte) No operation
* DD Prefix DD No operation
* E0 xx RET PO LD (byte),A Save A at (FF00+byte)
* E2 JP PO,word LD (C),A Save A at (FF00+C)
* E3 EX HL,(SP) No operation
* E4 CALL PO,word No operation
* E8 xx RET PE ADD SP,offset Add signed offset to SP
* EA xx xx JP PE,word LD (word),A Save A at given address
* EB EX DE,HL No operation
* EC CALL PE,word No operation
* F0 xx RET P LD A,(byte) Load A from (FF00+byte)
* F2 JP P,word No operation
* F4 CALL P,word No operation
* F8 xx RET M LDHL SP,offset Load HL with SP + signed offset
* FA xx xx JP M,word LD A,(word) Load A from given address
* FC CALL M,word No operation
* FD Prefix FD No operation
* ----------------------------------------------------------------------------
*/
/*
* Extensions: P. Felber
*/
/*)BUILD
$(PROGRAM) = ASGB
$(INCLUDE) = {
ASXXXX.H
GB.H
}
$(FILES) = {
GBMCH.C
GBADR.C
GBPST.C
ASMAIN.C
ASDBG.C
ASLEX.C
ASSYM.C
ASSUBR.C
ASEXPR.C
ASDATA.C
ASLIST.C
ASOUT.C
}
$(STACK) = 3000
*/
/*
* Indirect Addressing delimeters
*/
#define LFIND '('
#define RTIND ')'
/*
* Registers
*/
#define B 0
#define C 1
#define D 2
#define E 3
#define H 4
#define L 5
#define A 7
#define BC 0
#define DE 1
#define HL 2
#define SP 3
#define AF 4
#define HLD 5
#define HLI 6
/*
* Conditional definitions
*/
#define NZ 0
#define Z 1
#define NC 2
#define CS 3
/*
* Symbol types
*/
#define S_IMMED 30
#define S_R8 31
#define S_R16 33
#define S_R16X 34 /* AF */
#define S_CND 35
#define S_FLAG 36
/*
* Indexing modes
*/
#define S_INDB 40
#define S_IDC 41
#define S_INDR 50
#define S_IDBC 50
#define S_IDDE 51
#define S_IDHL 52
#define S_IDSP 53
#define S_IDHLD 55
#define S_IDHLI 56
#define S_INDM 57
/*
* Instruction types
*/
#define S_LD 60
#define S_CALL 61
#define S_JP 62
#define S_JR 63
#define S_RET 64
#define S_BIT 65
#define S_INC 66
#define S_DEC 67
#define S_ADD 68
#define S_ADC 69
#define S_AND 70
#define S_PUSH 72
#define S_LDH 73
#define S_RL 76
#define S_RST 77
#define S_IM 78
#define S_INH1 79
#define S_SUB 80
#define S_SBC 81
#define S_LDHL 90 /* LDHL SP,offset */
#define S_LDA 91
#define S_STOP 83
struct adsym
{
char a_str[4]; /* addressing string */
int a_val; /* addressing mode value */
};
extern struct adsym R8[];
extern struct adsym R16[];
extern struct adsym R16X[];
extern struct adsym CND[];
/* machine dependent functions */
#ifdef OTHERSYSTEM
/* gbadr.c */
extern int addr(struct expr *esp);
extern int admode(struct adsym *sp);
extern int any(int c, char *str);
extern int srch(char *str);
/* gbmch.c */
extern int genop(int pop, int op, struct expr *esp, int f);
extern VOID machine(struct mne *mp);
extern int mchpcr(struct expr *esp);
extern VOID minit(void);
#else
/* gbadr.c */
extern int addr();
extern int admode();
extern int any();
extern int srch();
/* gbmch.c */
extern int genop();
extern VOID machine();
extern int mchpcr();
extern VOID minit();
#endif
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