void Z80_Disassemble_GetDecoratedSymbolFromAddress(const char* mnemonic, u16 addr, char* buf, int buf_len, bool display_symbols, bool display_addr)
{
const t_debugger_symbol* symbol = NULL;
if (display_symbols)
{
if (Z80_IsModifyingPC(mnemonic))
symbol = Debugger_Symbols_GetClosestPreviousByAddr(addr, 64); // too misleading for data address so only use for code address
else
symbol = Debugger_Symbols_GetLastByAddr(addr);
}
if (symbol != NULL)
{
if (display_addr)
{
if (symbol->cpu_addr != addr)
snprintf(buf, buf_len,"%s+%Xh/%04Xh", symbol->name, addr-symbol->cpu_addr, addr);
else
snprintf(buf, buf_len,"%s/%04Xh", symbol->name, addr);
}
else
{
if (symbol->cpu_addr != addr)
snprintf(buf, buf_len,"%s+%Xh", symbol->name, addr-symbol->cpu_addr);
else
snprintf(buf, buf_len,"%s", symbol->name);
}
}
else
{
snprintf(buf, buf_len,"%04Xh", addr);
}
}
int Z80_Disassemble(char *S, word A, bool display_symbols, bool resolve_indirect_offsets)
{
char R[256], H[256], C, *T, *P;
byte J, Offset = 0;
word B;
int relative_offset_base = 0; // 0 : from PC, 1 : from IX, 2 : from IY
B = A;
C = '\0';
J = 0;
switch (RdZ80_NoHook(B))
{
case 0xCB: B++;T=MnemonicsCB[RdZ80_NoHook(B++&0xFFFF)];break;
case 0xED: B++;T=MnemonicsED[RdZ80_NoHook(B++&0xFFFF)];break;
case 0xDD: B++;C='X';
if (RdZ80_NoHook(B&0xFFFF)!=0xCB)
T=MnemonicsXX[RdZ80_NoHook(B++&0xFFFF)];
else
{ B++;Offset=RdZ80_NoHook(B++&0xFFFF);J=1;T=MnemonicsXCB[RdZ80_NoHook(B++&0xFFFF)]; }
break;
case 0xFD: B++;C='Y';
if(RdZ80_NoHook(B&0xFFFF)!=0xCB)
T=MnemonicsXX[RdZ80_NoHook(B++&0xFFFF)];
else
{ B++;Offset=RdZ80_NoHook(B++&0xFFFF);J=1;T=MnemonicsXCB[RdZ80_NoHook(B++&0xFFFF)]; }
break;
default:
T=Mnemonics[RdZ80_NoHook(B++&0xFFFF)];
break;
}
if ((P=strchr(T,'^')) != NULL)
{
strncpy(R,T,P-T);R[P-T]='\0';
sprintf(H,"%02Xh",RdZ80_NoHook(B++&0xFFFF));
strcat(R,H);strcat(R,P+2);
}
else
strcpy(R,T);
if ((P=strchr(R,'%')) != NULL)
{
*P=C;
if (C == 'X')
relative_offset_base = 1;
else if (C == 'Y')
relative_offset_base = 2;
}
if ((P=strchr(R,'*')) != NULL)
{
if (S != NULL)
{
strncpy(S,R,P-R);S[P-R]='\0';
sprintf(H,"%02Xh",RdZ80_NoHook(B++&0xFFFF));
strcat(S,H);strcat(S,P+2);
}
else
{
B++;
}
}
else
if ((P=strchr(R,'@')) != NULL)
{
if (S != NULL)
{
strncpy(S,R,P-R);S[P-R]='\0';
if(!J)
Offset=RdZ80_NoHook(B++&0xFFFF);
if (resolve_indirect_offsets && relative_offset_base == 0)
{
const u16 target = B + (signed char)Offset;
const char sign = (Offset & 0x80) ? '-' : '+';
J = (Offset & 0x80) ? 256 - Offset : Offset;
sprintf(H, "%c%02Xh (%04Xh)", sign, J, target);
strcat(S,H);strcat(S,P+2); // skip the 'h' in the instruction
}
else
{
strcat(S,Offset&0x80? "-":"+");
J=Offset&0x80? 256-Offset:Offset;
sprintf(H,"%02Xh",J);
strcat(S,H);strcat(S,P+2); // skip the 'h' in the instruction
}
}
else
{
B++;
}
}
else
if((P=strchr(R,'#')) != NULL)
{
if (S != NULL)
{
u16 addr = RdZ80_NoHook(B&0xFFFF)+256*RdZ80_NoHook((B+1)&0xFFFF);
t_debugger_symbol *symbol = display_symbols ? Debugger_Symbols_GetLastByAddr(addr) : NULL;
if (symbol != NULL)
{
strncpy(S,R,P-R);S[P-R]='\0';
snprintf(H,256,"%s (%04Xh)", symbol->name, addr);
strcat(S,H);strcat(S,P+2); // skip the 'h' in the instruction
}
else
{
strncpy(S,R,P-R);S[P-R]='\0';
sprintf(H,"%04Xh", addr);
strcat(S,H);strcat(S,P+2); // skip the 'h' in the instruction
}
}
B += 2;
}
else
{
if (S != NULL)
strcpy(S, R);
}
// MEKA-START: needed so it works properly when the instruction wrap at 0xffff
if (B < A)
return ((int)B+0x10000 - (int)A);
// MEKA-END
return (B-A);
}
int Z80_Disassemble(char *S, word A, bool display_symbols, bool display_symbols_for_current_index_registers, bool resolve_indirect_offsets)
{
char R[256], H[256], C;
byte Offset = 0;
bool has_offset = false;
word B;
int relative_offset_base = 0; // 0 : from PC, 1 : from IX, 2 : from IY
B = A;
C = '\0';
const char *T_const = NULL;
switch (RdZ80_NoHook(B))
{
case 0xCB: B++;T_const=MnemonicsCB[RdZ80_NoHook(B++&0xFFFF)];break;
case 0xED: B++;T_const=MnemonicsED[RdZ80_NoHook(B++&0xFFFF)];break;
case 0xDD: B++;C='x';
if (RdZ80_NoHook(B&0xFFFF)!=0xCB)
T_const=MnemonicsXX[RdZ80_NoHook(B++&0xFFFF)];
else
{ B++;Offset=RdZ80_NoHook(B++&0xFFFF);has_offset=true;T_const=MnemonicsXCB[RdZ80_NoHook(B++&0xFFFF)]; }
break;
case 0xFD: B++;C='y';
if(RdZ80_NoHook(B&0xFFFF)!=0xCB)
T_const=MnemonicsXX[RdZ80_NoHook(B++&0xFFFF)];
else
{ B++;Offset=RdZ80_NoHook(B++&0xFFFF);has_offset=true;T_const=MnemonicsXCB[RdZ80_NoHook(B++&0xFFFF)]; }
break;
default:
T_const=Mnemonics[RdZ80_NoHook(B++&0xFFFF)];
break;
}
char T[32];
strcpy(T, T_const);
StrLower(T);
char *P;
if ((P=strchr(T,'^')) != NULL)
{
assert(!has_offset); // Should never get a ^ in the DD CB and FD CB paths
if (S != NULL)
{
Offset = RdZ80_NoHook(B&0xFFFF);
// convert 0xFF to -0x01 for nicer display
const char offset_sign = (Offset & 0x80) ? '-' : '+';
const byte offset_abs = (Offset & 0x80) ? 256 - Offset : Offset;
if (resolve_indirect_offsets)
{
if (display_symbols_for_current_index_registers)
{
// P+2: skip the 'h' in the instruction
const u16 addr = ((C == 'x') ? sms.R.IX.W : sms.R.IY.W) + (signed char)Offset;
Z80_Disassemble_GetDecoratedSymbolFromAddress(R, addr, H, 256, display_symbols, false); // Don't display full address because it is obvious (for IX/IY being typically stable)
snprintf(R, 256, "%.*s%c%d=%s%s", (int)(P-T), T, offset_sign, offset_abs, H, P+2);
}
else
{
// P+2: skip the 'h' in the instruction
snprintf(R, 256, "%.*s%c%d%s", (int)(P-T), T, offset_sign, offset_abs, P+2);
}
}
else
{
snprintf(R, 256, "%.*s%c%d", (int)(P-T), T, offset_sign, offset_abs);
}
}
else
{
strcpy(R,T);
}
B++;
}
else
{
strcpy(R,T);
}
if ((P=strchr(R,'%')) != NULL)
{
*P=C;
if (C == 'x')
relative_offset_base = 1;
else if (C == 'y')
relative_offset_base = 2;
}
if ((P=strchr(R,'*')) != NULL)
{
if (S != NULL)
{
strncpy(S,R,P-R);S[P-R]='\0';
sprintf(H,"%02Xh",RdZ80_NoHook(B&0xFFFF));
strcat(S,H);strcat(S,P+2);
}
B++;
}
else
{
if ((P=strchr(R,'@')) != NULL)
{
if (S != NULL)
{
if(!has_offset)
Offset=RdZ80_NoHook(B&0xFFFF);
// convert 0xFF to -0x01 for nicer display
const char offset_sign = (Offset & 0x80) ? '-' : '+';
const byte offset_abs = (Offset & 0x80) ? 256 - Offset : Offset;
if (resolve_indirect_offsets)
{
// P+2: skip the 'h' in the instruction
if (relative_offset_base == 0)
{
const u16 addr = (B+1) + (signed char)Offset;
Z80_Disassemble_GetDecoratedSymbolFromAddress(R, addr, H, 256, display_symbols, true);
snprintf(S, 255, "%.*s%c%02Xh (%s)%s", (int)(P-R), R, offset_sign, offset_abs, H, P+2);
}
else
{
const u16 addr = ((relative_offset_base == 1) ? sms.R.IX.W : sms.R.IY.W) + (signed char)Offset;
Z80_Disassemble_GetDecoratedSymbolFromAddress(R, addr, H, 256, display_symbols, false); // Don't display full address because it is obvious (for IX/IY being typically stable)
snprintf(S, 255, "%.*s%c%d=%s%s", (int)(P-R), R, offset_sign, offset_abs, H, P+2);
}
}
else
{
// P+2: skip the 'h' in the instruction
snprintf(S, 256, "%.*s%c%02Xh%s", (int)(P-R), R, offset_sign, offset_abs, P+2);
}
}
if(!has_offset)
B++;
}
else if((P=strchr(R,'#')) != NULL)
{
if (S != NULL)
{
const u16 addr = RdZ80_NoHook(B&0xFFFF)+256*RdZ80_NoHook((B+1)&0xFFFF);
Z80_Disassemble_GetDecoratedSymbolFromAddress(R, addr, H, 256, display_symbols, true);
snprintf(S, 256, "%.*s%s%s", (int)(P-R), R, H, P+2);
}
B += 2;
}
else if(strncmp(R,"rst ",4)==0)
{
if (S != NULL)
{
const u16 addr = (u16)Debugger_Eval_ParseIntegerHex(R+4);
const t_debugger_symbol* symbol = display_symbols ? Debugger_Symbols_GetLastByAddr(addr) : NULL;
if (symbol != NULL)
{
sprintf(S,"rst %s/%02Xh", symbol->name, addr);
}
else
{
strcpy(S, R);
}
}
}
else
{
if (S != NULL)
strcpy(S, R);
}
}
// MEKA-START: needed so it works properly when the instruction wrap at 0xffff
if (B < A)
return ((int)B+0x10000 - (int)A);
// MEKA-END
return (B-A);
}
