GuyPerfect/pvbemu
3
1
Fork 0
Code Issues Pull Requests Releases Wiki Activity

HALT fix, QoL tweaks

Browse Source
This commit is contained in:
GuyPerfect
2021-09-20 14:32:09 +00:00
parent 89feaaa3e9
commit b33a6c3055
7 changed files with 89 additions and 56 deletions
Download Patch File Download Diff File Expand all files Collapse all files
core/cpu.c
+51 -11
View File
@@ -979,7 +979,7 @@ static void cpuDIVU(VB *emu, VB_INSTRUCTION *inst) {
static void cpuHALT(VB *emu, VB_INSTRUCTION *inst) {
emu->cpu.state = CPU_HALTED;
inst->size = 0;
/* TODO: Find out how many clocks this takes */
/* emu->cpu.clocks = ? */
}
/* Input Byte */
@@ -1491,8 +1491,8 @@ static int cpuExecute(VB *emu) {
/* Post-instruction tasks */
if (emu->cpu.causeCode == 0 && !emu->cpu.busWait) {
/* Advance to next instruction if not processing a bit string */
if (!emu->cpu.substring)
/* Advance to next instruction */
if (emu->cpu.state != CPU_HALTED && !emu->cpu.substring)
emu->cpu.pc += inst->size;
/* Check for interrupts */
@@ -1505,11 +1505,10 @@ static int cpuExecute(VB *emu) {
emu->cpu.substring = 0;
}
/* Switch to fetch mode if not halting and execution has completed */
/* Switch to fetch mode */
else if (emu->cpu.state != CPU_HALTED &&
!emu->cpu.busWait && !emu->cpu.substring) {
emu->cpu.state = CPU_FETCH;
emu->cpu.fetch = 0;
}
return 0;
@@ -1518,6 +1517,7 @@ static int cpuExecute(VB *emu) {
/* Enter an exception state */
static int cpuException(VB *emu) {
uint16_t causeCode = emu->cpu.causeCode;
int irq = causeCode < 0xFF00;
/* Fatal exception */
if (emu->cpu.psw.np) {
@@ -1587,7 +1587,7 @@ static int cpuException(VB *emu) {
else {
emu->cpu.ecr.eicc = causeCode;
emu->cpu.eipsw = vbGetSystemRegister(emu, VB_PSW);
emu->cpu.eipc = emu->cpu.pc;
emu->cpu.eipc = emu->cpu.pc + (irq ? 2 : 0);
emu->cpu.eipcFrom = emu->cpu.pcFrom;
emu->cpu.eipcTo = emu->cpu.pcTo;
emu->cpu.psw.ep = 1;
@@ -1596,7 +1596,7 @@ static int cpuException(VB *emu) {
}
/* Interrupt */
if (causeCode < 0xFF00)
if (irq)
emu->cpu.psw.i += emu->cpu.psw.i == 15 ? 0 : 1;
/* Update state */
@@ -1690,10 +1690,11 @@ static int cpuEmulate(VB *emu, uint32_t clocks) {
/* Processing by operations state */
switch (emu->cpu.state) {
case CPU_FETCH : if (cpuFetch (emu)) return 1; break;
case CPU_EXECUTE : if (cpuExecute (emu)) return 1; break;
case CPU_EXCEPTION: if (cpuException(emu)) return 1; break;
case CPU_HALTED : if (cpuCheckIRQs(emu)) return 0; break;
case CPU_EXCEPTION: if ( cpuException(emu)) return 1; break;
case CPU_EXECUTE : if ( cpuExecute (emu)) return 1; break;
case CPU_FATAL : return 0; break;
case CPU_FETCH : if ( cpuFetch (emu)) return 1; break;
case CPU_HALTED : if (!cpuCheckIRQs(emu)) return 0; break;
}
} while (clocks > 0);
@@ -1702,6 +1703,45 @@ static int cpuEmulate(VB *emu, uint32_t clocks) {
return 0;
}
/* Simulate a hardware reset */
static void cpuReset(VB *emu) {
int x; /* Iterator */
/* Registers */
vbSetProgramCounter(emu, 0xFFFFFFF0);
vbSetSystemRegister(emu, VB_ECR, 0x0000FFF0);
vbSetSystemRegister(emu, VB_PSW, 0x00008000);
/* Cache */
vbSetSystemRegister(emu, VB_CHCW, 0x00000000);
/* Other state */
emu->cpu.busWait = 0;
emu->cpu.state = CPU_FETCH;
emu->cpu.substring = 0;
for (x = 0; x < 5; x++)
emu->cpu.irq[x] = 0;
/* Other registers (the hardware does not do this) */
for (x = 0; x < 32; x++)
emu->cpu.program[x] = 0x00000000;
emu->cpu.adtre = 0x00000000;
emu->cpu.eipc = 0x00000000;
emu->cpu.eipsw = 0x00000000;
emu->cpu.fepc = 0x00000000;
emu->cpu.fepsw = 0x00000000;
emu->cpu.sr29 = 0x00000000;
emu->cpu.sr31 = 0x00000000;
/* History tracking */
emu->cpu.eipcFrom = 0xFFFFFFF0;
emu->cpu.eipcTo = 0xFFFFFFF0;
emu->cpu.fepcFrom = 0xFFFFFFF0;
emu->cpu.fepcTo = 0xFFFFFFF0;
emu->cpu.pcFrom = 0xFFFFFFF0;
emu->cpu.pcTo = 0xFFFFFFF0;
}
/* Determine the number of clocks before a break condititon could occur */
static uint32_t cpuUntil(VB *emu, uint32_t clocks) {
core/vb.c
+2 -30
View File
@@ -197,36 +197,8 @@ int32_t vbRead(VB *emu, uint32_t address, int type, int debug) {
void vbReset(VB *emu) {
uint32_t x; /* Iterator */
/* CPU registers */
vbSetProgramCounter(emu, 0xFFFFFFF0);
vbSetSystemRegister(emu, VB_ECR, 0x0000FFF0);
vbSetSystemRegister(emu, VB_PSW, 0x00008000);
/* Extra CPU registers (the hardware does not do this) */
for (x = 0; x < 32; x++)
emu->cpu.program[x] = 0x00000000;
emu->cpu.adtre = 0x00000000;
emu->cpu.eipc = 0x00000000;
emu->cpu.eipsw = 0x00000000;
emu->cpu.fepc = 0x00000000;
emu->cpu.fepsw = 0x00000000;
emu->cpu.sr29 = 0x00000000;
emu->cpu.sr31 = 0x00000000;
/* History tracking */
emu->cpu.eipcFrom = 0xFFFFFFF0;
emu->cpu.eipcTo = 0xFFFFFFF0;
emu->cpu.fepcFrom = 0xFFFFFFF0;
emu->cpu.fepcTo = 0xFFFFFFF0;
emu->cpu.pcFrom = 0xFFFFFFF0;
emu->cpu.pcTo = 0xFFFFFFF0;
/* Other CPU state */
emu->cpu.busWait = 0;
emu->cpu.state = CPU_FETCH;
emu->cpu.substring = 0;
for (x = 0; x < 5; x++)
emu->cpu.irq[x] = 0;
/* Subsystem components */
cpuReset(emu);
/* WRAM (the hardware does not do this) */
for (x = 0; x < 0x10000; x++)