/** Z80: portable Z80 emulator *******************************/
/**                                                         **/
/**                         Debug.c                         **/
/**                                                         **/
/** This file contains the built-in debugging routine for   **/
/** the Z80 emulator which is called on each Z80 step when  **/
/** Trap!=0.                                                **/
/**                                                         **/
/** Copyright (C) Marat Fayzullin 1995-2021                 **/
/**     You are not allowed to distribute this software     **/
/**     commercially. Please, notify me, if you make any    **/
/**     changes to this file.                               **/
/*************************************************************/
#ifdef DEBUG

#include "Z80.h"

#include <stdio.h>
#include <ctype.h>
#include <string.h>

#ifdef FMSX
#include "AY8910.h"
extern AY8910 PSG;
#endif

static const char *Mnemonics[256] =
{
  "NOP","LD BC,#h","LD (BC),A","INC BC","INC B","DEC B","LD B,*h","RLCA",
  "EX AF,AF'","ADD HL,BC","LD A,(BC)","DEC BC","INC C","DEC C","LD C,*h","RRCA",
  "DJNZ @h","LD DE,#h","LD (DE),A","INC DE","INC D","DEC D","LD D,*h","RLA",
  "JR @h","ADD HL,DE","LD A,(DE)","DEC DE","INC E","DEC E","LD E,*h","RRA",
  "JR NZ,@h","LD HL,#h","LD (#h),HL","INC HL","INC H","DEC H","LD H,*h","DAA",
  "JR Z,@h","ADD HL,HL","LD HL,(#h)","DEC HL","INC L","DEC L","LD L,*h","CPL",
  "JR NC,@h","LD SP,#h","LD (#h),A","INC SP","INC (HL)","DEC (HL)","LD (HL),*h","SCF",
  "JR C,@h","ADD HL,SP","LD A,(#h)","DEC SP","INC A","DEC A","LD A,*h","CCF",
  "LD B,B","LD B,C","LD B,D","LD B,E","LD B,H","LD B,L","LD B,(HL)","LD B,A",
  "LD C,B","LD C,C","LD C,D","LD C,E","LD C,H","LD C,L","LD C,(HL)","LD C,A",
  "LD D,B","LD D,C","LD D,D","LD D,E","LD D,H","LD D,L","LD D,(HL)","LD D,A",
  "LD E,B","LD E,C","LD E,D","LD E,E","LD E,H","LD E,L","LD E,(HL)","LD E,A",
  "LD H,B","LD H,C","LD H,D","LD H,E","LD H,H","LD H,L","LD H,(HL)","LD H,A",
  "LD L,B","LD L,C","LD L,D","LD L,E","LD L,H","LD L,L","LD L,(HL)","LD L,A",
  "LD (HL),B","LD (HL),C","LD (HL),D","LD (HL),E","LD (HL),H","LD (HL),L","HALT","LD (HL),A",
  "LD A,B","LD A,C","LD A,D","LD A,E","LD A,H","LD A,L","LD A,(HL)","LD A,A",
  "ADD B","ADD C","ADD D","ADD E","ADD H","ADD L","ADD (HL)","ADD A",
  "ADC B","ADC C","ADC D","ADC E","ADC H","ADC L","ADC (HL)","ADC A",
  "SUB B","SUB C","SUB D","SUB E","SUB H","SUB L","SUB (HL)","SUB A",
  "SBC B","SBC C","SBC D","SBC E","SBC H","SBC L","SBC (HL)","SBC A",
  "AND B","AND C","AND D","AND E","AND H","AND L","AND (HL)","AND A",
  "XOR B","XOR C","XOR D","XOR E","XOR H","XOR L","XOR (HL)","XOR A",
  "OR B","OR C","OR D","OR E","OR H","OR L","OR (HL)","OR A",
  "CP B","CP C","CP D","CP E","CP H","CP L","CP (HL)","CP A",
  "RET NZ","POP BC","JP NZ,#h","JP #h","CALL NZ,#h","PUSH BC","ADD *h","RST 00h",
  "RET Z","RET","JP Z,#h","PFX_CB","CALL Z,#h","CALL #h","ADC *h","RST 08h",
  "RET NC","POP DE","JP NC,#h","OUTA (*h)","CALL NC,#h","PUSH DE","SUB *h","RST 10h",
  "RET C","EXX","JP C,#h","INA (*h)","CALL C,#h","PFX_DD","SBC *h","RST 18h",
  "RET PO","POP HL","JP PO,#h","EX HL,(SP)","CALL PO,#h","PUSH HL","AND *h","RST 20h",
  "RET PE","LD PC,HL","JP PE,#h","EX DE,HL","CALL PE,#h","PFX_ED","XOR *h","RST 28h",
  "RET P","POP AF","JP P,#h","DI","CALL P,#h","PUSH AF","OR *h","RST 30h",
  "RET M","LD SP,HL","JP M,#h","EI","CALL M,#h","PFX_FD","CP *h","RST 38h"
};

static const char *MnemonicsCB[256] =
{
  "RLC B","RLC C","RLC D","RLC E","RLC H","RLC L","RLC (HL)","RLC A",
  "RRC B","RRC C","RRC D","RRC E","RRC H","RRC L","RRC (HL)","RRC A",
  "RL B","RL C","RL D","RL E","RL H","RL L","RL (HL)","RL A",
  "RR B","RR C","RR D","RR E","RR H","RR L","RR (HL)","RR A",
  "SLA B","SLA C","SLA D","SLA E","SLA H","SLA L","SLA (HL)","SLA A",
  "SRA B","SRA C","SRA D","SRA E","SRA H","SRA L","SRA (HL)","SRA A",
  "SLL B","SLL C","SLL D","SLL E","SLL H","SLL L","SLL (HL)","SLL A",
  "SRL B","SRL C","SRL D","SRL E","SRL H","SRL L","SRL (HL)","SRL A",
  "BIT 0,B","BIT 0,C","BIT 0,D","BIT 0,E","BIT 0,H","BIT 0,L","BIT 0,(HL)","BIT 0,A",
  "BIT 1,B","BIT 1,C","BIT 1,D","BIT 1,E","BIT 1,H","BIT 1,L","BIT 1,(HL)","BIT 1,A",
  "BIT 2,B","BIT 2,C","BIT 2,D","BIT 2,E","BIT 2,H","BIT 2,L","BIT 2,(HL)","BIT 2,A",
  "BIT 3,B","BIT 3,C","BIT 3,D","BIT 3,E","BIT 3,H","BIT 3,L","BIT 3,(HL)","BIT 3,A",
  "BIT 4,B","BIT 4,C","BIT 4,D","BIT 4,E","BIT 4,H","BIT 4,L","BIT 4,(HL)","BIT 4,A",
  "BIT 5,B","BIT 5,C","BIT 5,D","BIT 5,E","BIT 5,H","BIT 5,L","BIT 5,(HL)","BIT 5,A",
  "BIT 6,B","BIT 6,C","BIT 6,D","BIT 6,E","BIT 6,H","BIT 6,L","BIT 6,(HL)","BIT 6,A",
  "BIT 7,B","BIT 7,C","BIT 7,D","BIT 7,E","BIT 7,H","BIT 7,L","BIT 7,(HL)","BIT 7,A",
  "RES 0,B","RES 0,C","RES 0,D","RES 0,E","RES 0,H","RES 0,L","RES 0,(HL)","RES 0,A",
  "RES 1,B","RES 1,C","RES 1,D","RES 1,E","RES 1,H","RES 1,L","RES 1,(HL)","RES 1,A",
  "RES 2,B","RES 2,C","RES 2,D","RES 2,E","RES 2,H","RES 2,L","RES 2,(HL)","RES 2,A",
  "RES 3,B","RES 3,C","RES 3,D","RES 3,E","RES 3,H","RES 3,L","RES 3,(HL)","RES 3,A",
  "RES 4,B","RES 4,C","RES 4,D","RES 4,E","RES 4,H","RES 4,L","RES 4,(HL)","RES 4,A",
  "RES 5,B","RES 5,C","RES 5,D","RES 5,E","RES 5,H","RES 5,L","RES 5,(HL)","RES 5,A",
  "RES 6,B","RES 6,C","RES 6,D","RES 6,E","RES 6,H","RES 6,L","RES 6,(HL)","RES 6,A",
  "RES 7,B","RES 7,C","RES 7,D","RES 7,E","RES 7,H","RES 7,L","RES 7,(HL)","RES 7,A",
  "SET 0,B","SET 0,C","SET 0,D","SET 0,E","SET 0,H","SET 0,L","SET 0,(HL)","SET 0,A",
  "SET 1,B","SET 1,C","SET 1,D","SET 1,E","SET 1,H","SET 1,L","SET 1,(HL)","SET 1,A",
  "SET 2,B","SET 2,C","SET 2,D","SET 2,E","SET 2,H","SET 2,L","SET 2,(HL)","SET 2,A",
  "SET 3,B","SET 3,C","SET 3,D","SET 3,E","SET 3,H","SET 3,L","SET 3,(HL)","SET 3,A",
  "SET 4,B","SET 4,C","SET 4,D","SET 4,E","SET 4,H","SET 4,L","SET 4,(HL)","SET 4,A",
  "SET 5,B","SET 5,C","SET 5,D","SET 5,E","SET 5,H","SET 5,L","SET 5,(HL)","SET 5,A",
  "SET 6,B","SET 6,C","SET 6,D","SET 6,E","SET 6,H","SET 6,L","SET 6,(HL)","SET 6,A",
  "SET 7,B","SET 7,C","SET 7,D","SET 7,E","SET 7,H","SET 7,L","SET 7,(HL)","SET 7,A"
};

static const char *MnemonicsED[256] =
{
  "DB EDh,00h","DB EDh,01h","DB EDh,02h","DB EDh,03h",
  "DB EDh,04h","DB EDh,05h","DB EDh,06h","DB EDh,07h",
  "DB EDh,08h","DB EDh,09h","DB EDh,0Ah","DB EDh,0Bh",
  "DB EDh,0Ch","DB EDh,0Dh","DB EDh,0Eh","DB EDh,0Fh",
  "DB EDh,10h","DB EDh,11h","DB EDh,12h","DB EDh,13h",
  "DB EDh,14h","DB EDh,15h","DB EDh,16h","DB EDh,17h",
  "DB EDh,18h","DB EDh,19h","DB EDh,1Ah","DB EDh,1Bh",
  "DB EDh,1Ch","DB EDh,1Dh","DB EDh,1Eh","DB EDh,1Fh",
  "DB EDh,20h","DB EDh,21h","DB EDh,22h","DB EDh,23h",
  "DB EDh,24h","DB EDh,25h","DB EDh,26h","DB EDh,27h",
  "DB EDh,28h","DB EDh,29h","DB EDh,2Ah","DB EDh,2Bh",
  "DB EDh,2Ch","DB EDh,2Dh","DB EDh,2Eh","DB EDh,2Fh",
  "DB EDh,30h","DB EDh,31h","DB EDh,32h","DB EDh,33h",
  "DB EDh,34h","DB EDh,35h","DB EDh,36h","DB EDh,37h",
  "DB EDh,38h","DB EDh,39h","DB EDh,3Ah","DB EDh,3Bh",
  "DB EDh,3Ch","DB EDh,3Dh","DB EDh,3Eh","DB EDh,3Fh",
  "IN B,(C)","OUT (C),B","SBC HL,BC","LD (#h),BC",
  "NEG","RETN","IM 0","LD I,A",
  "IN C,(C)","OUT (C),C","ADC HL,BC","LD BC,(#h)",
  "DB EDh,4Ch","RETI","DB EDh,4Eh","LD R,A",
  "IN D,(C)","OUT (C),D","SBC HL,DE","LD (#h),DE",
  "DB EDh,54h","DB EDh,55h","IM 1","LD A,I",
  "IN E,(C)","OUT (C),E","ADC HL,DE","LD DE,(#h)",
  "DB EDh,5Ch","DB EDh,5Dh","IM 2","LD A,R",
  "IN H,(C)","OUT (C),H","SBC HL,HL","LD (#h),HL",
  "DB EDh,64h","DB EDh,65h","DB EDh,66h","RRD",
  "IN L,(C)","OUT (C),L","ADC HL,HL","LD HL,(#h)",
  "DB EDh,6Ch","DB EDh,6Dh","DB EDh,6Eh","RLD",
  "IN F,(C)","DB EDh,71h","SBC HL,SP","LD (#h),SP",
  "DB EDh,74h","DB EDh,75h","DB EDh,76h","DB EDh,77h",
  "IN A,(C)","OUT (C),A","ADC HL,SP","LD SP,(#h)",
  "DB EDh,7Ch","DB EDh,7Dh","DB EDh,7Eh","DB EDh,7Fh",
  "DB EDh,80h","DB EDh,81h","DB EDh,82h","DB EDh,83h",
  "DB EDh,84h","DB EDh,85h","DB EDh,86h","DB EDh,87h",
  "DB EDh,88h","DB EDh,89h","DB EDh,8Ah","DB EDh,8Bh",
  "DB EDh,8Ch","DB EDh,8Dh","DB EDh,8Eh","DB EDh,8Fh",
  "DB EDh,90h","DB EDh,91h","DB EDh,92h","DB EDh,93h",
  "DB EDh,94h","DB EDh,95h","DB EDh,96h","DB EDh,97h",
  "DB EDh,98h","DB EDh,99h","DB EDh,9Ah","DB EDh,9Bh",
  "DB EDh,9Ch","DB EDh,9Dh","DB EDh,9Eh","DB EDh,9Fh",
  "LDI","CPI","INI","OUTI",
  "DB EDh,A4h","DB EDh,A5h","DB EDh,A6h","DB EDh,A7h",
  "LDD","CPD","IND","OUTD",
  "DB EDh,ACh","DB EDh,ADh","DB EDh,AEh","DB EDh,AFh",
  "LDIR","CPIR","INIR","OTIR",
  "DB EDh,B4h","DB EDh,B5h","DB EDh,B6h","DB EDh,B7h",
  "LDDR","CPDR","INDR","OTDR",
  "DB EDh,BCh","DB EDh,BDh","DB EDh,BEh","DB EDh,BFh",
  "DB EDh,C0h","DB EDh,C1h","DB EDh,C2h","DB EDh,C3h",
  "DB EDh,C4h","DB EDh,C5h","DB EDh,C6h","DB EDh,C7h",
  "DB EDh,C8h","DB EDh,C9h","DB EDh,CAh","DB EDh,CBh",
  "DB EDh,CCh","DB EDh,CDh","DB EDh,CEh","DB EDh,CFh",
  "DB EDh,D0h","DB EDh,D1h","DB EDh,D2h","DB EDh,D3h",
  "DB EDh,D4h","DB EDh,D5h","DB EDh,D6h","DB EDh,D7h",
  "DB EDh,D8h","DB EDh,D9h","DB EDh,DAh","DB EDh,DBh",
  "DB EDh,DCh","DB EDh,DDh","DB EDh,DEh","DB EDh,DFh",
  "DB EDh,E0h","DB EDh,E1h","DB EDh,E2h","DB EDh,E3h",
  "DB EDh,E4h","DB EDh,E5h","DB EDh,E6h","DB EDh,E7h",
  "DB EDh,E8h","DB EDh,E9h","DB EDh,EAh","DB EDh,EBh",
  "DB EDh,ECh","DB EDh,EDh","DB EDh,EEh","DB EDh,EFh",
  "DB EDh,F0h","DB EDh,F1h","DB EDh,F2h","DB EDh,F3h",
  "DB EDh,F4h","DB EDh,F5h","DB EDh,F6h","DB EDh,F7h",
  "DB EDh,F8h","DB EDh,F9h","DB EDh,FAh","DB EDh,FBh",
  "DB EDh,FCh","DB EDh,FDh","DB EDh,FEh","DB EDh,FFh"
};

static const char *MnemonicsXX[256] =
{
  "NOP","LD BC,#h","LD (BC),A","INC BC","INC B","DEC B","LD B,*h","RLCA",
  "EX AF,AF'","ADD I%,BC","LD A,(BC)","DEC BC","INC C","DEC C","LD C,*h","RRCA",
  "DJNZ @h","LD DE,#h","LD (DE),A","INC DE","INC D","DEC D","LD D,*h","RLA",
  "JR @h","ADD I%,DE","LD A,(DE)","DEC DE","INC E","DEC E","LD E,*h","RRA",
  "JR NZ,@h","LD I%,#h","LD (#h),I%","INC I%","INC I%h","DEC I%h","LD I%h,*h","DAA",
  "JR Z,@h","ADD I%,I%","LD I%,(#h)","DEC I%","INC I%l","DEC I%l","LD I%l,*h","CPL",
  "JR NC,@h","LD SP,#h","LD (#h),A","INC SP","INC (I%+^h)","DEC (I%+^h)","LD (I%+^h),*h","SCF",
  "JR C,@h","ADD I%,SP","LD A,(#h)","DEC SP","INC A","DEC A","LD A,*h","CCF",
  "LD B,B","LD B,C","LD B,D","LD B,E","LD B,I%h","LD B,I%l","LD B,(I%+^h)","LD B,A",
  "LD C,B","LD C,C","LD C,D","LD C,E","LD C,I%h","LD C,I%l","LD C,(I%+^h)","LD C,A",
  "LD D,B","LD D,C","LD D,D","LD D,E","LD D,I%h","LD D,I%l","LD D,(I%+^h)","LD D,A",
  "LD E,B","LD E,C","LD E,D","LD E,E","LD E,I%h","LD E,I%l","LD E,(I%+^h)","LD E,A",
  "LD I%h,B","LD I%h,C","LD I%h,D","LD I%h,E","LD I%h,I%h","LD I%h,I%l","LD H,(I%+^h)","LD I%h,A",
  "LD I%l,B","LD I%l,C","LD I%l,D","LD I%l,E","LD I%l,I%h","LD I%l,I%l","LD L,(I%+^h)","LD I%l,A",
  "LD (I%+^h),B","LD (I%+^h),C","LD (I%+^h),D","LD (I%+^h),E","LD (I%+^h),H","LD (I%+^h),L","HALT","LD (I%+^h),A",
  "LD A,B","LD A,C","LD A,D","LD A,E","LD A,I%h","LD A,I%l","LD A,(I%+^h)","LD A,A",
  "ADD B","ADD C","ADD D","ADD E","ADD I%h","ADD I%l","ADD (I%+^h)","ADD A",
  "ADC B","ADC C","ADC D","ADC E","ADC I%h","ADC I%l","ADC (I%+^h)","ADC,A",
  "SUB B","SUB C","SUB D","SUB E","SUB I%h","SUB I%l","SUB (I%+^h)","SUB A",
  "SBC B","SBC C","SBC D","SBC E","SBC I%h","SBC I%l","SBC (I%+^h)","SBC A",
  "AND B","AND C","AND D","AND E","AND I%h","AND I%l","AND (I%+^h)","AND A",
  "XOR B","XOR C","XOR D","XOR E","XOR I%h","XOR I%l","XOR (I%+^h)","XOR A",
  "OR B","OR C","OR D","OR E","OR I%h","OR I%l","OR (I%+^h)","OR A",
  "CP B","CP C","CP D","CP E","CP I%h","CP I%l","CP (I%+^h)","CP A",
  "RET NZ","POP BC","JP NZ,#h","JP #h","CALL NZ,#h","PUSH BC","ADD *h","RST 00h",
  "RET Z","RET","JP Z,#h","PFX_CB","CALL Z,#h","CALL #h","ADC *h","RST 08h",
  "RET NC","POP DE","JP NC,#h","OUTA (*h)","CALL NC,#h","PUSH DE","SUB *h","RST 10h",
  "RET C","EXX","JP C,#h","INA (*h)","CALL C,#h","PFX_DD","SBC *h","RST 18h",
  "RET PO","POP I%","JP PO,#h","EX I%,(SP)","CALL PO,#h","PUSH I%","AND *h","RST 20h",
  "RET PE","LD PC,I%","JP PE,#h","EX DE,I%","CALL PE,#h","PFX_ED","XOR *h","RST 28h",
  "RET P","POP AF","JP P,#h","DI","CALL P,#h","PUSH AF","OR *h","RST 30h",
  "RET M","LD SP,I%","JP M,#h","EI","CALL M,#h","PFX_FD","CP *h","RST 38h"
};

static const char *MnemonicsXCB[256] =
{
  "RLC B","RLC C","RLC D","RLC E","RLC H","RLC L","RLC (I%@h)","RLC A",
  "RRC B","RRC C","RRC D","RRC E","RRC H","RRC L","RRC (I%@h)","RRC A",
  "RL B","RL C","RL D","RL E","RL H","RL L","RL (I%@h)","RL A",
  "RR B","RR C","RR D","RR E","RR H","RR L","RR (I%@h)","RR A",
  "SLA B","SLA C","SLA D","SLA E","SLA H","SLA L","SLA (I%@h)","SLA A",
  "SRA B","SRA C","SRA D","SRA E","SRA H","SRA L","SRA (I%@h)","SRA A",
  "SLL B","SLL C","SLL D","SLL E","SLL H","SLL L","SLL (I%@h)","SLL A",
  "SRL B","SRL C","SRL D","SRL E","SRL H","SRL L","SRL (I%@h)","SRL A",
  "BIT 0,B","BIT 0,C","BIT 0,D","BIT 0,E","BIT 0,H","BIT 0,L","BIT 0,(I%@h)","BIT 0,A",
  "BIT 1,B","BIT 1,C","BIT 1,D","BIT 1,E","BIT 1,H","BIT 1,L","BIT 1,(I%@h)","BIT 1,A",
  "BIT 2,B","BIT 2,C","BIT 2,D","BIT 2,E","BIT 2,H","BIT 2,L","BIT 2,(I%@h)","BIT 2,A",
  "BIT 3,B","BIT 3,C","BIT 3,D","BIT 3,E","BIT 3,H","BIT 3,L","BIT 3,(I%@h)","BIT 3,A",
  "BIT 4,B","BIT 4,C","BIT 4,D","BIT 4,E","BIT 4,H","BIT 4,L","BIT 4,(I%@h)","BIT 4,A",
  "BIT 5,B","BIT 5,C","BIT 5,D","BIT 5,E","BIT 5,H","BIT 5,L","BIT 5,(I%@h)","BIT 5,A",
  "BIT 6,B","BIT 6,C","BIT 6,D","BIT 6,E","BIT 6,H","BIT 6,L","BIT 6,(I%@h)","BIT 6,A",
  "BIT 7,B","BIT 7,C","BIT 7,D","BIT 7,E","BIT 7,H","BIT 7,L","BIT 7,(I%@h)","BIT 7,A",
  "RES 0,B","RES 0,C","RES 0,D","RES 0,E","RES 0,H","RES 0,L","RES 0,(I%@h)","RES 0,A",
  "RES 1,B","RES 1,C","RES 1,D","RES 1,E","RES 1,H","RES 1,L","RES 1,(I%@h)","RES 1,A",
  "RES 2,B","RES 2,C","RES 2,D","RES 2,E","RES 2,H","RES 2,L","RES 2,(I%@h)","RES 2,A",
  "RES 3,B","RES 3,C","RES 3,D","RES 3,E","RES 3,H","RES 3,L","RES 3,(I%@h)","RES 3,A",
  "RES 4,B","RES 4,C","RES 4,D","RES 4,E","RES 4,H","RES 4,L","RES 4,(I%@h)","RES 4,A",
  "RES 5,B","RES 5,C","RES 5,D","RES 5,E","RES 5,H","RES 5,L","RES 5,(I%@h)","RES 5,A",
  "RES 6,B","RES 6,C","RES 6,D","RES 6,E","RES 6,H","RES 6,L","RES 6,(I%@h)","RES 6,A",
  "RES 7,B","RES 7,C","RES 7,D","RES 7,E","RES 7,H","RES 7,L","RES 7,(I%@h)","RES 7,A",
  "SET 0,B","SET 0,C","SET 0,D","SET 0,E","SET 0,H","SET 0,L","SET 0,(I%@h)","SET 0,A",
  "SET 1,B","SET 1,C","SET 1,D","SET 1,E","SET 1,H","SET 1,L","SET 1,(I%@h)","SET 1,A",
  "SET 2,B","SET 2,C","SET 2,D","SET 2,E","SET 2,H","SET 2,L","SET 2,(I%@h)","SET 2,A",
  "SET 3,B","SET 3,C","SET 3,D","SET 3,E","SET 3,H","SET 3,L","SET 3,(I%@h)","SET 3,A",
  "SET 4,B","SET 4,C","SET 4,D","SET 4,E","SET 4,H","SET 4,L","SET 4,(I%@h)","SET 4,A",
  "SET 5,B","SET 5,C","SET 5,D","SET 5,E","SET 5,H","SET 5,L","SET 5,(I%@h)","SET 5,A",
  "SET 6,B","SET 6,C","SET 6,D","SET 6,E","SET 6,H","SET 6,L","SET 6,(I%@h)","SET 6,A",
  "SET 7,B","SET 7,C","SET 7,D","SET 7,E","SET 7,H","SET 7,L","SET 7,(I%@h)","SET 7,A"
};

/** DAsm() ***************************************************/
/** DAsm() will disassemble the code at adress A and put    **/
/** the output text into S. It will return the number of    **/
/** bytes disassembled.                                     **/
/*************************************************************/
static int DAsm(char *S,word A)
{
  char R[128],H[10],C,*P;
  const char *T;
  byte J,Offset;
  word B;

  Offset=0;
  B=A;
  C='\0';
  J=0;

  switch(RdZ80(B))
  {
    case 0xCB: B++;T=MnemonicsCB[RdZ80(B++)];break;
    case 0xED: B++;T=MnemonicsED[RdZ80(B++)];break;
    case 0xDD: B++;C='X';
               if(RdZ80(B)!=0xCB) T=MnemonicsXX[RdZ80(B++)];
               else
               { B++;Offset=RdZ80(B++);J=1;T=MnemonicsXCB[RdZ80(B++)]; }
               break;
    case 0xFD: B++;C='Y';
               if(RdZ80(B)!=0xCB) T=MnemonicsXX[RdZ80(B++)];
               else
               { B++;Offset=RdZ80(B++);J=1;T=MnemonicsXCB[RdZ80(B++)]; }
               break;
    default:   T=Mnemonics[RdZ80(B++)];
  }

  if((P=strchr(T,'^')))
  {
    strncpy(R,T,P-T);R[P-T]='\0';
    sprintf(H,"%02X",RdZ80(B++));
    strcat(R,H);strcat(R,P+1);
  }
  else strcpy(R,T);
  if((P=strchr(R,'%'))) *P=C;

  if((P=strchr(R,'*')))
  {
    strncpy(S,R,P-R);S[P-R]='\0';
    sprintf(H,"%02X",RdZ80(B++));
    strcat(S,H);strcat(S,P+1);
  }
  else if((P=strchr(R,'@')))
  {
    strncpy(S,R,P-R);S[P-R]='\0';
    if(!J) Offset=RdZ80(B++);
    strcat(S,Offset&0x80? "-":"+");
    J=Offset&0x80? 256-Offset:Offset;
    sprintf(H,"%02X",J);
    strcat(S,H);strcat(S,P+1);
  }
  else if((P=strchr(R,'#')))
  {
    strncpy(S,R,P-R);S[P-R]='\0';
    sprintf(H,"%04X",RdZ80(B)+256*RdZ80(B+1));
    strcat(S,H);strcat(S,P+1);
    B+=2;
  }
  else strcpy(S,R);

  return(B-A);
}

/** DebugZ80() ***********************************************/
/** This function should exist if DEBUG is #defined. When   **/
/** Trace!=0, it is called after each command executed by   **/
/** the CPU, and given the Z80 registers.                   **/
/*************************************************************/
byte DebugZ80(Z80 *R)
{
  static const char Flags[9] = "SZ.H.PNC";
  char S[128],T[10];
  byte J,I;

  DAsm(S,R->PC.W);
  for(J=0,I=R->AF.B.l;J<8;J++,I<<=1) T[J]=I&0x80? Flags[J]:'.';
  T[8]='\0';

  printf
  (
    "AF:%04X HL:%04X DE:%04X BC:%04X PC:%04X SP:%04X IX:%04X IY:%04X I:%02X\n",
    R->AF.W,R->HL.W,R->DE.W,R->BC.W,R->PC.W,R->SP.W,R->IX.W,R->IY.W,R->I
  ); 
  printf
  ( 
    "AT PC: [%02X - %s]   AT SP: [%04X]   FLAGS: [%s]   %s: %s\n\n",
    RdZ80(R->PC.W),S,RdZ80(R->SP.W)+RdZ80(R->SP.W+1)*256,T,
    R->IFF&0x04? "IM2":R->IFF&0x02? "IM1":"IM0",
    R->IFF&0x01? "EI":"DI"
  );

  while(1)
  {
    printf("\n[Command,'?']-> ");
    fflush(stdout);fflush(stdin);

    if(!fgets(S,50,stdin)) return(1);

    for(J=0;S[J]>=' ';J++)
      S[J]=toupper(S[J]);
    S[J]='\0';

    switch(S[0])
    {
      case 'H':
      case '?':
        puts("\n***** Built-in Z80 Debugger Commands *****");
        puts("<CR>       : Break at next instruction");
        puts("= <addr>   : Break at addr");
        puts("+ <offset> : Break at PC + offset");
        puts("c          : Continue without break");
        puts("j <addr>   : Continue from addr");
        puts("m <addr>   : Memory dump at addr");
        puts("d <addr>   : Disassembly at addr");
        puts("?,h        : Show this help text");
        puts("q          : Exit Z80 emulation");
        break;

      case '\0': return(1);
      case '=':  if(strlen(S)>=2)
                 { sscanf(S+1,"%hX",&(R->Trap));R->Trace=0;return(1); }
                 break;
      case '+':  if(strlen(S)>=2)
                 {
                   sscanf(S+1,"%hX",&(R->Trap));
                   R->Trap+=R->PC.W;R->Trace=0;
                   return(1);
                 }
                 break;
      case 'J':  if(strlen(S)>=2)
                 { sscanf(S+1,"%hX",&(R->PC.W));R->Trace=0;return(1); }
                 break;
      case 'C':  R->Trap=0xFFFF;R->Trace=0;return(1);
      case 'Q':  return(0);

      case 'M':
        {
          word Addr;

          if(strlen(S)>1) sscanf(S+1,"%hX",&Addr); else Addr=R->PC.W;
          puts("");
          for(J=0;J<16;J++)
          {
            printf("%04X: ",Addr);
            for(I=0;I<16;I++,Addr++)
              printf("%02X ",RdZ80(Addr));
            printf(" | ");Addr-=16;
            for(I=0;I<16;I++,Addr++)
              putchar(isprint(RdZ80(Addr))? RdZ80(Addr):'.');
            puts("");
          }
        }
        break;

      case 'D':
        {
          word Addr;

          if(strlen(S)>1) sscanf(S+1,"%hX",&Addr); else Addr=R->PC.W;
          puts("");
          for(J=0;J<16;J++)
          {
            printf("%04X: ",Addr);
            Addr+=DAsm(S,Addr);
            puts(S);
          }
        }
        break;

#ifdef FMSX
      case 'S':
        for(J=0;J<AY8910_CHANNELS;J++)
        {
          printf("Channel %d: Volume %d, Frequency %dHz",J,PSG.Volume[J],PSG.Freq[J]);
          if(!(PSG.R[8+(J%3)]&0x10)) printf("\n");
          else printf(", Envelope %d\n",PSG.R[8+(J%3)]&0x0F);
        }
        printf("Envelope period %dms\n",PSG.EPeriod);
        break;
#endif /* FMSX */
    }
  }

  /* Continue emulation */
  return(1);
}

#endif /* DEBUG */
