X-Git-Url: https://notaz.gp2x.de/cgi-bin/gitweb.cgi?p=pcsx_rearmed.git;a=blobdiff_plain;f=libpcsxcore%2Fpsxbios.c;h=ecd4264d5db5fe1d24e7f84ee8c9b69fb1103ea1;hp=98e467a3ff7374a3772a9e9b64196a4974de2533;hb=e49ac7a53e2fb04e24c6e75b7d38bf357210b96c;hpb=a15f3544923a9d2ca3baa2dd9ced9f040ce197e8

diff --git a/libpcsxcore/psxbios.c b/libpcsxcore/psxbios.c
index 98e467a3..ecd4264d 100644
--- a/libpcsxcore/psxbios.c
+++ b/libpcsxcore/psxbios.c
@@ -307,6 +307,8 @@ static inline void DeliverEvent(u32 ev, u32 spec) {
 	} else Event[ev][spec].status = EvStALREADY;
 }
 
+static unsigned interrupt_r26=0x8004E8B0;
+
 static inline void SaveRegs() {
 	memcpy(regs, psxRegs.GPR.r, 32*4);
 	regs[32] = psxRegs.GPR.n.lo;
@@ -344,6 +346,7 @@ static inline void LoadRegs() {
 	ptr = Mcd##mcd##Data + offset; \
 	memcpy(ptr, Ra1, length); \
 	FDesc[1 + mcd].offset += length; \
+	SaveMcd(Config.Mcd##mcd, Mcd##mcd##Data, offset, length); \
 	if (FDesc[1 + mcd].mode & 0x8000) { \
 	DeliverEvent(0x11, 0x2); /* 0xf0000011, 0x0004 */ \
 	DeliverEvent(0x81, 0x2); /* 0xf4000001, 0x0004 */ \
@@ -922,6 +925,12 @@ void psxBios_memcmp() { // 0x2d
 
 void psxBios_memchr() { // 0x2e
 	char *p = (char *)Ra0;
+	
+	if (a0 == 0 || a2 > 0x7FFFFFFF)
+	{
+		pc0 = ra;
+		return;
+	}
 
 	while ((s32)a2-- > 0) {
 		if (*p++ != (s8)a1) continue;
@@ -1555,6 +1564,13 @@ void psxBios_SetMem() { // 9f
 	pc0 = ra;
 }
 
+/* TODO FIXME : Not compliant. -1 indicates failure but using 1 for now. */
+void psxBios_get_cd_status(void) //a6
+{
+	v0 = 1;
+	pc0 = ra;
+}
+
 void psxBios__card_info() { // ab
 #ifdef PSXBIOS_LOG
 	PSXBIOS_LOG("psxBios_%s: %x\n", biosA0n[0xab], a0);
@@ -1578,11 +1594,8 @@ void psxBios__card_info() { // ab
 		break;
 	}
 	
-//	DeliverEvent(0x11, 0x2); // 0xf0000011, 0x0004
-//	DeliverEvent(0x11, 0x2); // 0xf0000011, 0x0004
-	DeliverEvent(0x81, 0x2); // 0xf4000001, 0x0004
+	DeliverEvent(0x11, 0x2); // 0xf4000001, 0x0004
 	DeliverEvent(0x81, ret); // 0xf4000001, 0x0004
-
 	v0 = 1; pc0 = ra;
 }
 
@@ -1863,12 +1876,10 @@ void psxBios_CloseTh() { // 0f
 #ifdef PSXBIOS_LOG
 	PSXBIOS_LOG("psxBios_%s: %x\n", biosB0n[0x0f], th);
 #endif
-
-	if (Thread[th].status == 0) {
-		v0 = 0;
-	} else {
+	/* The return value is always 1 (even if the handle was already closed). */
+	v0 = 1;
+	if (Thread[th].status != 0) {
 		Thread[th].status = 0;
-		v0 = 1;
 	}
 
 	pc0 = ra;
@@ -1884,14 +1895,11 @@ void psxBios_ChangeTh() { // 10
 #ifdef PSXBIOS_LOG
 //	PSXBIOS_LOG("psxBios_%s: %x\n", biosB0n[0x10], th);
 #endif
-
+	/* The return value is always 1. */
+	v0 = 1;
 	if (Thread[th].status == 0 || CurThread == th) {
-		v0 = 0;
-
 		pc0 = ra;
 	} else {
-		v0 = 1;
-
 		if (Thread[CurThread].status == 2) {
 			Thread[CurThread].status = 1;
 			Thread[CurThread].func = ra;
@@ -1968,6 +1976,7 @@ void psxBios_ReturnFromException() { // 17
 	LoadRegs();
 
 	pc0 = psxRegs.CP0.n.EPC;
+	k0 = interrupt_r26;
 	if (psxRegs.CP0.n.Cause & 0x80000000) pc0 += 4;
 
 	psxRegs.CP0.n.Status = (psxRegs.CP0.n.Status & 0xfffffff0) |
@@ -2275,7 +2284,7 @@ void psxBios_firstfile() { // 42
 	if (pa0) {
 		strcpy(ffile, pa0);
 		pfile = ffile+5;
-		nfile = 1;
+		nfile = 0;
 		if (!strncmp(pa0, "bu00", 4)) {
 			// firstfile() calls _card_read() internally, so deliver it's event
 			DeliverEvent(0x11, 0x2);
@@ -2442,8 +2451,11 @@ void psxBios__card_write() { // 0x4e
 #ifdef PSXBIOS_LOG
 	PSXBIOS_LOG("psxBios_%s: %x,%x,%x\n", biosB0n[0x4e], a0, a1, a2);
 #endif
-	/* Function also accepts sector 400h (a bug) */
-	if (!(a1 <= 0x400))
+	/*
+	Function also accepts sector 400h (a bug).
+	But notaz said we shouldn't allow sector 400h because it can corrupt the emulator.
+	*/
+	if (!(a1 <= 0x3FF))
 	{
 		/* Invalid sectors */
 		v0 = 0; pc0 = ra;
@@ -2475,8 +2487,11 @@ void psxBios__card_read() { // 0x4f
 #ifdef PSXBIOS_LOG
 	PSXBIOS_LOG("psxBios_%s\n", biosB0n[0x4f]);
 #endif
-	/* Function also accepts sector 400h (a bug) */
-	if (!(a1 <= 0x400))
+	/*
+	Function also accepts sector 400h (a bug).
+	But notaz said we shouldn't allow sector 400h because it can corrupt the emulator.
+	*/
+	if (!(a1 <= 0x3FF))
 	{
 		/* Invalid sectors */
 		v0 = 0; pc0 = ra;
@@ -2595,7 +2610,7 @@ void psxBios__card_status() { // 5c
 	PSXBIOS_LOG("psxBios_%s: %x\n", biosB0n[0x5c], a0);
 #endif
 
-	v0 = 1;
+	v0 = card_active_chan;
 	pc0 = ra;
 }
 
@@ -2855,7 +2870,7 @@ void psxBiosInit() {
 	//biosA0[0xa3] = psxBios_DequeueCdIntr;
 	//biosA0[0xa4] = psxBios_sys_a0_a4;
 	//biosA0[0xa5] = psxBios_ReadSector;
-	//biosA0[0xa6] = psxBios_get_cd_status;
+	biosA0[0xa6] = psxBios_get_cd_status;
 	//biosA0[0xa7] = psxBios_bufs_cb_0;
 	//biosA0[0xa8] = psxBios_bufs_cb_1;
 	//biosA0[0xa9] = psxBios_bufs_cb_2;
@@ -3042,7 +3057,9 @@ void psxBiosInit() {
 */
 	// opcode HLE
 	psxRu32ref(0x0000) = SWAPu32((0x3b << 26) | 4);
-	psxMu32ref(0x0000) = SWAPu32((0x3b << 26) | 0);
+	/* Whatever this does, it actually breaks CTR, even without the uninitiliazed memory patch. 
+	Normally games shouldn't read from address 0 yet they do. See explanation below in details. */
+	//psxMu32ref(0x0000) = SWAPu32((0x3b << 26) | 0);
 	psxMu32ref(0x00a0) = SWAPu32((0x3b << 26) | 1);
 	psxMu32ref(0x00b0) = SWAPu32((0x3b << 26) | 2);
 	psxMu32ref(0x00c0) = SWAPu32((0x3b << 26) | 3);
@@ -3068,6 +3085,22 @@ void psxBiosInit() {
 	psxHu32ref(0x1060) = SWAPu32(0x00000b88);
 
 	hleSoftCall = FALSE;
+	
+	/*	Some games like R-Types, CTR, Fade to Black read from adress 0x00000000 due to uninitialized pointers.
+		See Garbage Area at Address 00000000h in Nocash PSX Specfications for more information.
+		Here are some examples of games not working with this fix in place :
+		R-type won't get past the Irem logo if not implemented.
+		Crash Team Racing will softlock after the Sony logo.
+	*/
+	
+	psxMu32ref(0x0000) = SWAPu32(0x00000003);
+	/*
+	But overwritten by 00000003h after soon.
+	psxMu32ref(0x0000) = SWAPu32(0x00001A3C);
+	*/
+	psxMu32ref(0x0004) = SWAPu32(0x800C5A27);
+	psxMu32ref(0x0008) = SWAPu32(0x08000403);
+	psxMu32ref(0x000C) = SWAPu32(0x00000000);
 }
 
 void psxBiosShutdown() {
@@ -3190,6 +3223,7 @@ void psxBiosException() {
 
 	switch (psxRegs.CP0.n.Cause & 0x3c) {
 		case 0x00: // Interrupt
+			interrupt_r26=psxRegs.CP0.n.EPC;
 #ifdef PSXCPU_LOG
 //			PSXCPU_LOG("interrupt\n");
 #endif
@@ -3303,4 +3337,5 @@ void psxBiosFreeze(int Mode) {
 	bfreezes(FDesc);
 	bfreezel(&card_active_chan);
 	bfreezel(&pad_stopped);
+	bfreezel(&heap_size);
 }