/* Process 1OP Integer instructions */
bool eval_1OP_Int(struct lilith* vm, struct Instruction* c)
{
#ifdef DEBUG
char Name[20] = "ILLEGAL_1OP";
#endif
switch(c->raw_XOP)
{
case 0x00000: /* READPC */
{
#ifdef DEBUG
strncpy(Name, "READPC", 19);
#elif TRACE
record_trace("READPC");
#endif
READPC(vm, c);
break;
}
case 0x00001: /* READSCID */
{
#ifdef DEBUG
strncpy(Name, "READSCID", 19);
#elif TRACE
record_trace("READSCID");
#endif
READSCID(vm, c);
break;
}
case 0x00002: /* FALSE */
{
#ifdef DEBUG
strncpy(Name, "FALSE", 19);
#elif TRACE
record_trace("FALSE");
#endif
FALSE(vm, c);
break;
}
case 0x00003: /* TRUE */
{
#ifdef DEBUG
strncpy(Name, "TRUE", 19);
#elif TRACE
record_trace("TRUE");
#endif
TRUE(vm, c);
break;
}
case 0x01000: /* JSR_COROUTINE */
{
#ifdef DEBUG
strncpy(Name, "JSR_COROUTINE", 19);
#elif TRACE
record_trace("JSR_COROUTINE");
#endif
JSR_COROUTINE(vm, c);
break;
}
case 0x01001: /* RET */
{
#ifdef DEBUG
strncpy(Name, "RET", 19);
#elif TRACE
record_trace("RET");
#endif
RET(vm, c);
break;
}
case 0x02000: /* PUSHPC */
{
#ifdef DEBUG
strncpy(Name, "PUSHPC", 19);
#elif TRACE
record_trace("PUSHPC");
#endif
PUSHPC(vm, c);
break;
}
case 0x02001: /* POPPC */
{
#ifdef DEBUG
strncpy(Name, "POPPC", 19);
#elif TRACE
record_trace("POPPC");
#endif
POPPC(vm, c);
break;
}
default:
{
illegal_instruction(vm, c);
break;
}
}
#ifdef DEBUG
fprintf(stdout, "# %s reg%u\n", Name, c->reg0);
#endif
return false;
}
int execute(int ncycles)
{
// FILE *fp;
// fp = fopen("log.txt","a");
int Counter = ncycles;
gbcpu.forcequit=0;
//emulation loop
for (;;)
{
//variaveis temporarias para operacoes(não existe no processador)
reg16bit opAux;
uint16 address;
uint8 tempbyte;
int8 signedtempbyte;
reg32bit opAux32;
uint32_t temp32;
uint8 OpCode;
int usedcycles=0;
#ifdef DEBUG
printStatusZ80();
printf("Counter: %u \n",Counter);
printf("**************************\n");
printMEMStatus(gbcpu.mem);
/*misc*/
printf("lcd cyclecounter: %d\n",gbcpu.lcd->scanlinecyclecounter);
printf("**************************\n");
#endif
if(IE & IF){
gbcpu.halt=0;
/*interupts*/
if (IME){
//v-sync
if (IE & IF & 0x1){
IME=0;
IF&= ~(0x1);
PUSHPC();
PC=0x40;
}else
//LCD STAT
if (IE & IF & 0x2){
IME=0;
IF&= ~(0x2);
PUSHPC();
PC=0x48;
}else
//Timer
if (IE & IF & 0x4){
IME=0;
IF&= ~(0x4);
PUSHPC();
PC=0x50;
}else
//Serial
if (IE & IF & 0x8){
IME=0;
IF&= ~(0x8);
PUSHPC();
PC=0x58;
}else
//Joypad
if (IE & IF & 0x10){
IME=0;
IF&= ~(0x10);
PUSHPC();
PC=0x60;
}
}
}
if (SET_IME){
IME=1;
SET_IME=0;
}
if(!gbcpu.halt){
OpCode = readMem(PC, gbcpu.mem);
PC++;
usedcycles += Cycles[OpCode];
#ifdef DEBUG
printf("opcode:%02x ",OpCode);
CyclesCount[OpCode]++;
#endif
switch (OpCode)
{
#include "Opcodes.h"
default:
printf("error undefined opcode");
exit(-1);
break;
}
}else
//halt
usedcycles=4;
#ifdef DEBUG
/*printf("Press <ENTER> to Continue\n\n");
for(;;){
char c=getchar();
if (c == '\n')
break;
}*/
#endif
//update timers,lcd status and cyclecount
Counter-=usedcycles;
gbcpu.cyclecounter += usedcycles;
updatetimers(usedcycles);
updateLCDStatus(usedcycles);
if (Counter <= 0)
{
return 0;
}
if (gbcpu.forcequit == 1)
{
return 0;
}
}
return 0;
}
