char* Z80_disassemble(_u16* pc_in)
{
int bcnt, i;
_u16 pc = *pc_in;
char instr[64]; //Print the disassembled instruction to this string
_u8 str[80];
memset(str, 0, 80);
//Add the program counter
sprintf(str, "<z80> %03X: ", pc);
//Disassemble instruction
bcnt = DAsm(instr,ram + 0x7000 + pc);
//Add the instruction
strcat(str, instr);
//Add the bytes used
for (i = strlen(str); i < 32; i++)
str[i] = ' ';
str[32] = '\"';
for (i = 0; i < bcnt; i++)
{
_u8 tmp[80];
sprintf(tmp, "%02X ", *(ram + 0x7000 + pc + i));
strcat(str, tmp);
}
str[strlen(str) - 1] = '\"';
*pc_in = pc + bcnt;
return strdup(str);
}
byte DebugZ80(Z80 *R)
{
static 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);
fgets(S,50,stdin);
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;
}
}
/* Continue emulation */
return(1);
}