X-Git-Url: https://notaz.gp2x.de/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=libpcsxcore%2Fpsxbios.c;h=e654f7c9c5d62e8469cf18ee062134454dc4cafe;hb=f993417941fb79ae2f22f72e0dc131cd3710a3af;hp=83bc684a35de11f35ec58cf0d16487a7f460e456;hpb=0890ae159b413fa4a5c84c0db1bf7e2eb05f4849;p=pcsx_rearmed.git

diff --git a/libpcsxcore/psxbios.c b/libpcsxcore/psxbios.c
index 83bc684a..e654f7c9 100644
--- a/libpcsxcore/psxbios.c
+++ b/libpcsxcore/psxbios.c
@@ -36,6 +36,7 @@
 #include "sio.h"
 #include "psxhle.h"
 #include "psxinterpreter.h"
+#include "psxevents.h"
 #include <zlib.h>
 
 #ifndef PSXBIOS_LOG
@@ -302,13 +303,19 @@ static u32 floodchk;
 #define A_CD_EVENTS     0xb9b8
 #define A_EXC_GP        0xf450
 
-#define A_A0_DUMMY      0x1010
-#define A_B0_DUMMY      0x2010
-#define A_C0_DUMMY      0x3010
-#define A_B0_5B_DUMMY   0x43d0
+#define A_A0_TRAPS      0x1010
+#define A_B0_TRAPS      0x2010
+#define A_C0_TRAPS      0x3010
+#define A_B0_5B_TRAP    0x43d0
 
 #define HLEOP(n) SWAPu32((0x3b << 26) | (n));
 
+static u8 loadRam8(u32 addr)
+{
+	assert(!(addr & 0x5f800000));
+	return psxM[addr & 0x1fffff];
+}
+
 static u32 loadRam32(u32 addr)
 {
 	assert(!(addr & 0x5f800000));
@@ -391,14 +398,17 @@ static inline void softCall(u32 pc) {
 	ra = 0x80001000;
 	psxRegs.CP0.n.SR &= ~0x404; // disable interrupts
 
+	assert(psxRegs.cpuInRecursion <= 1);
+	psxRegs.cpuInRecursion++;
 	psxCpu->Notify(R3000ACPU_NOTIFY_AFTER_LOAD, PTR_1);
 
-	while (pc0 != 0x80001000 && ++lim < 1000000)
+	while (pc0 != 0x80001000 && ++lim < 0x100000)
 		psxCpu->ExecuteBlock(EXEC_CALLER_HLE);
 
 	psxCpu->Notify(R3000ACPU_NOTIFY_BEFORE_SAVE, PTR_1);
+	psxRegs.cpuInRecursion--;
 
-	if (lim == 1000000)
+	if (lim == 0x100000)
 		PSXBIOS_LOG("softCall @%x hit lim\n", pc);
 	ra = sra;
 	psxRegs.CP0.n.SR |= ssr & 0x404;
@@ -414,14 +424,16 @@ static inline void softCallInException(u32 pc) {
 		return;
 	ra = 0x80001000;
 
+	psxRegs.cpuInRecursion++;
 	psxCpu->Notify(R3000ACPU_NOTIFY_AFTER_LOAD, PTR_1);
 
-	while (!returned_from_exception() && pc0 != 0x80001000 && ++lim < 1000000)
+	while (!returned_from_exception() && pc0 != 0x80001000 && ++lim < 0x100000)
 		psxCpu->ExecuteBlock(EXEC_CALLER_HLE);
 
 	psxCpu->Notify(R3000ACPU_NOTIFY_BEFORE_SAVE, PTR_1);
+	psxRegs.cpuInRecursion--;
 
-	if (lim == 1000000)
+	if (lim == 0x100000)
 		PSXBIOS_LOG("softCallInException @%x hit lim\n", pc);
 	if (pc0 == 0x80001000)
 		ra = sra;
@@ -520,12 +532,8 @@ void psxBios_putc(void) // 0x09, 0x3B
 	pc0 = ra;
 }
 
-void psxBios_todigit(void) // 0x0a
+static u32 do_todigit(u32 c)
 {
-	int c = a0;
-#ifdef PSXBIOS_LOG
-	PSXBIOS_LOG("psxBios_%s\n", biosA0n[0x0a]);
-#endif
 	c &= 0xFF;
 	if (c >= 0x30 && c < 0x3A) {
 		c -= 0x30;
@@ -537,14 +545,73 @@ void psxBios_todigit(void) // 0x0a
 		c = c - 0x41 + 10;
 	}
 	else if (c >= 0x80) {
+		log_unhandled("todigit %02x\n", c);
 		c = -1;
 	}
 	else
 	{
 		c = 0x0098967F;
 	}
-	v0 = c;
-	pc0 = ra;
+	use_cycles(40);
+	return c;
+}
+
+static void psxBios_todigit(void) // 0x0a
+{
+	mips_return(do_todigit(a0));
+	PSXBIOS_LOG("psxBios_%s '%c' -> %u\n", biosA0n[0x0a], a0, v0);
+}
+
+static void do_strtol(char *p, void *end_, u32 base, int can_neg) {
+	s32 n = 0, f = 0, t;
+	u32 *end = end_;
+
+	use_cycles(12);
+	if (p == INVALID_PTR) {
+		mips_return(0);
+		return;
+	}
+
+	for (; (0x09 <= *p && *p <= '\r') || *p == ' '; p++)
+		use_cycles(9);
+	if (can_neg) {
+		for (; *p == '-'; f = 1, p++)
+			use_cycles(4);
+	}
+	if (base == 0 || base > 36)
+		base = 10;
+	if (*p == '0') {
+		switch (*p++) {
+		case 'b': case 'B': base = 2; break;
+		case 'x': case 'X': base = 16; break;
+		}
+	}
+	else if (*p == 'o' || *p == 'O') {
+		base = 8;
+		p++;
+	}
+
+	for (; (t = do_todigit(*p)) < base; p++) {
+		n = n * base + t;
+		use_cycles(12);
+	}
+
+	n = (f ? -n : n);
+	if (end != INVALID_PTR)
+		*end = SWAP32(a0 + (p - Ra0));
+	mips_return_c(n, 100);
+}
+
+static void psxBios_strtoul() { // 0x0c
+	do_strtol(a0 ? Ra0 : INVALID_PTR, a1 ? Ra1 : INVALID_PTR, a2, 0);
+	PSXBIOS_LOG("psxBios_%s %s (%x), %x, %x -> 0x%x\n",
+		biosA0n[0x0c], a0 ? Ra0 : NULL, a0, a1, a2, v0);
+}
+
+static void psxBios_strtol() { // 0x0d
+	do_strtol(a0 ? Ra0 : INVALID_PTR, a1 ? Ra1 : INVALID_PTR, a2, 1);
+	PSXBIOS_LOG("psxBios_%s %s (%x), %x, %x -> 0x%x\n",
+		biosA0n[0x0d], a0 ? Ra0 : NULL, a0, a1, a2, v0);
 }
 
 void psxBios_abs() { // 0x0e
@@ -561,6 +628,11 @@ void psxBios_atoi() { // 0x10
 	s32 n = 0, f = 0;
 	char *p = (char *)Ra0;
 
+	if (p == INVALID_PTR) {
+		mips_return(0);
+		return;
+	}
+
 	for (;;p++) {
 		switch (*p) {
 			case ' ': case '\t': continue;
@@ -576,6 +648,7 @@ void psxBios_atoi() { // 0x10
 
 	v0 = (f ? -n : n);
 	pc0 = ra;
+	PSXBIOS_LOG("psxBios_%s %s (%x) -> 0x%x\n", biosA0n[0x10], Ra0, a0, v0);
 }
 
 void psxBios_atol() { // 0x11
@@ -625,22 +698,24 @@ void psxBios_longjmp() { // 0x14
 }
 
 void psxBios_strcat() { // 0x15
-	char *p1 = (char *)Ra0, *p2 = (char *)Ra1;
+	u8 *p2 = (u8 *)Ra1;
+	u32 p1 = a0;
 
-#ifdef PSXBIOS_LOG
-	PSXBIOS_LOG("psxBios_%s: %s, %s\n", biosA0n[0x15], Ra0, Ra1);
-#endif
-	if (a0 == 0 || a1 == 0)
+	PSXBIOS_LOG("psxBios_%s %s (%x), %s (%x)\n", biosA0n[0x15], Ra0, a0, Ra1, a1);
+	if (a0 == 0 || a1 == 0 || p2 == INVALID_PTR)
 	{
-		v0 = 0;
-		pc0 = ra;
+		mips_return_c(0, 6);
 		return;
 	}
-	while (*p1++);
-	--p1;
-	while ((*p1++ = *p2++) != '\0');
+	while (loadRam8(p1)) {
+		use_cycles(4);
+		p1++;
+	}
+	for (; *p2; p1++, p2++)
+		storeRam8(p1, *p2);
+	storeRam8(p1, 0);
 
-	v0 = a0; pc0 = ra;
+	mips_return_c(a0, 22);
 }
 
 void psxBios_strncat() { // 0x16
@@ -759,6 +834,7 @@ void psxBios_strncmp() { // 0x18
 
 void psxBios_strcpy() { // 0x19
 	char *p1 = (char *)Ra0, *p2 = (char *)Ra1;
+	PSXBIOS_LOG("psxBios_%s %x, %s (%x)\n", biosA0n[0x19], a0, p2, a1);
 	if (a0 == 0 || a1 == 0)
 	{
 		v0 = 0;
@@ -900,6 +976,7 @@ void psxBios_strtok() { // 0x23
 
 void psxBios_strstr() { // 0x24
 	char *p = (char *)Ra0, *p1, *p2;
+	PSXBIOS_LOG("psxBios_%s %s (%x), %s (%x)\n", biosA0n[0x24], p, a0, Ra1, a1);
 
 	while (*p != '\0') {
 		p1 = p;
@@ -912,10 +989,12 @@ void psxBios_strstr() { // 0x24
 		if (*p2 == '\0') {
 			v0 = a0 + (p - (char *)Ra0);
 			pc0 = ra;
+			PSXBIOS_LOG(" -> %x\n", v0);
 			return;
 		}
 
-		p++;
+		// bug: skips the whole matched substring + 1
+		p = p1 + 1;
 	}
 
 	v0 = 0; pc0 = ra;
@@ -1455,13 +1534,15 @@ void psxBios_printf() { // 0x3f
 }
 
 static void psxBios_cd() { // 0x40
-	const char *p, *dir = castRam8ptr(a0);
+	const char *p, *dir = Ra0;
 	PSXBIOS_LOG("psxBios_%s %x(%s)\n", biosB0n[0x40], a0, dir);
-	if ((p = strchr(dir, ':')))
-		dir = ++p;
-	if (*dir == '\\')
-		dir++;
-	snprintf(cdir, sizeof(cdir), "%s", dir);
+	if (dir != INVALID_PTR) {
+		if ((p = strchr(dir, ':')))
+			dir = ++p;
+		if (*dir == '\\')
+			dir++;
+		snprintf(cdir, sizeof(cdir), "%s", dir);
+	}
 	mips_return_c(1, 100);
 }
 
@@ -2542,7 +2623,7 @@ void psxBios_puts() { // 3e/3f
 }
 
 static void bufile(const u8 *mcd_data, u32 dir_) {
-	struct DIRENTRY *dir = (struct DIRENTRY *)castRam8ptr(dir_);
+	struct DIRENTRY *dir = (struct DIRENTRY *)PSXM(dir_);
 	const char *pfile = ffile + 5;
 	const u8 *data = mcd_data;
 	int i = 0, match = 0;
@@ -2550,6 +2631,9 @@ static void bufile(const u8 *mcd_data, u32 dir_) {
 	u32 head = 0;
 
 	v0 = 0;
+	if (dir == INVALID_PTR)
+		return;
+
 	for (; nfile <= 15 && !match; nfile++) {
 		const char *name;
 
@@ -2603,11 +2687,12 @@ static void bufile(const u8 *mcd_data, u32 dir_) {
  */
 
 static void psxBios_firstfile() { // 42
-	char *pa0 = castRam8ptr(a0);
+	char *pa0 = Ra0;
 
 	PSXBIOS_LOG("psxBios_%s %s %x\n", biosB0n[0x42], pa0, a1);
 	v0 = 0;
 
+	if (pa0 != INVALID_PTR)
 	{
 		snprintf(ffile, sizeof(ffile), "%s", pa0);
 		if (ffile[5] == 0)
@@ -3292,7 +3377,6 @@ void psxBiosSetupBootState(void)
 		GPU_writeStatus(gpu_ctl_def[i]);
 	for (i = 0; i < sizeof(gpu_data_def) / sizeof(gpu_data_def[0]); i++)
 		GPU_writeData(gpu_data_def[i]);
-	HW_GPU_STATUS |= SWAP32(PSXGPU_nBUSY);
 
 	// spu
 	for (i = 0x1f801d80; i < sizeof(spu_config) / sizeof(spu_config[0]); i++)
@@ -3312,6 +3396,8 @@ void psxBiosInit() {
 	int i;
 	uLongf len;
 
+	psxRegs.biosBranchCheck = ~0;
+
 	memset(psxM, 0, 0x10000);
 	for(i = 0; i < 256; i++) {
 		biosA0[i] = NULL;
@@ -3323,7 +3409,15 @@ void psxBiosInit() {
 	biosA0[0x3e] = biosB0[0x3f] = psxBios_puts_psxout;
 	biosA0[0x3f] = psxBios_printf_psxout;
 
-	if (!Config.HLE) return;
+	if (!Config.HLE) {
+		char verstr[0x24+1];
+		rom32 = (u32 *)psxR;
+		memcpy(verstr, psxR + 0x12c, 0x24);
+		verstr[0x24] = 0;
+		SysPrintf("BIOS: %08x, '%s', '%c'\n", SWAP32(rom32[0x100/4]),
+			verstr, psxR[0x7ff52]);
+		return;
+	}
 
 	for(i = 0; i < 256; i++) {
 		if (biosA0[i] == NULL) biosA0[i] = psxBios_dummy;
@@ -3343,8 +3437,8 @@ void psxBiosInit() {
 	biosA0[0x09] = psxBios_putc;
 	biosA0[0x0a] = psxBios_todigit;
 	//biosA0[0x0b] = psxBios_atof;
-	//biosA0[0x0c] = psxBios_strtoul;
-	//biosA0[0x0d] = psxBios_strtol;
+	biosA0[0x0c] = psxBios_strtoul;
+	biosA0[0x0d] = psxBios_strtol;
 	biosA0[0x0e] = psxBios_abs;
 	biosA0[0x0f] = psxBios_labs;
 	biosA0[0x10] = psxBios_atoi;
@@ -3713,18 +3807,25 @@ void psxBiosInit() {
 
 	// fill the api jumptables with fake entries as some games patch them
 	// (or rather the funcs listed there)
+	// also trap the destination as some "Cheats Edition" thing overrides the
+	// dispatcher with a wrapper and then jumps to the table entries directly
 	ptr = (u32 *)&psxM[A_A0_TABLE];
-	for (i = 0; i < 256; i++)
-		ptr[i] = SWAP32(A_A0_DUMMY);
-
+	for (i = 0; i < 256; i++) {
+		ptr[i] = SWAP32(A_A0_TRAPS + i*4);
+		ram32[A_A0_TRAPS/4 + i] = HLEOP(hleop_a0t);
+	}
 	ptr = (u32 *)&psxM[A_B0_TABLE];
-	for (i = 0; i < 256; i++)
-		ptr[i] = SWAP32(A_B0_DUMMY);
+	for (i = 0; i < 256; i++) {
+		ptr[i] = SWAP32(A_B0_TRAPS + i*4);
+		ram32[A_B0_TRAPS/4 + i] = HLEOP(hleop_b0t);
+	}
 	// B(5b) is special because games patch (sometimes even jump to)
 	// code at fixed offsets from it, nocash lists offsets:
 	//  patch: +3d8, +4dc, +594, +62c, +9c8, +1988
 	//  call:  +7a0=4b70, +884=4c54, +894=4c64
-	ptr[0x5b] = SWAP32(A_B0_5B_DUMMY);    // 0x43d0
+	ptr[0x5b] = SWAP32(A_B0_5B_TRAP);     // 0x43d0
+	ram32[A_B0_5B_TRAP/4] = HLEOP(hleop_b0t);
+
 	ram32[0x4b70/4] = SWAP32(0x03e00008); // jr $ra // setPadOutputBuf
 
 	ram32[0x4c54/4] = SWAP32(0x240e0001); // mov $t6, 1
@@ -3735,15 +3836,17 @@ void psxBiosInit() {
 	ram32[0x4c68/4] = SWAP32(0xac000000 + A_PAD_IRQR_ENA); // sw $0, ...
 
 	ptr = (u32 *)&psxM[A_C0_TABLE];
-	for (i = 0; i < 256/2; i++)
-		ptr[i] = SWAP32(A_C0_DUMMY);
+	for (i = 0; i < 256/2; i++) {
+		ptr[i] = SWAP32(A_C0_TRAPS + i*4);
+		ram32[A_C0_TRAPS/4 + i] = HLEOP(hleop_c0t);
+	}
 	ptr[6] = SWAP32(A_EXCEPTION);
 
 	// more HLE traps
-	ram32[A_A0_DUMMY/4] = HLEOP(hleop_dummy);
-	ram32[A_B0_DUMMY/4] = HLEOP(hleop_dummy);
-	ram32[A_C0_DUMMY/4] = HLEOP(hleop_dummy);
-	ram32[A_B0_5B_DUMMY/4] = HLEOP(hleop_dummy);
+	ram32[A_A0_TRAPS/4 - 1] = HLEOP(hleop_dummy);
+	ram32[A_B0_TRAPS/4 - 1] = HLEOP(hleop_dummy);
+	ram32[A_C0_TRAPS/4 - 1] = HLEOP(hleop_dummy);
+	ram32[0x7ffc/4] = HLEOP(hleop_dummy);
 	ram32[0x8000/4] = HLEOP(hleop_execret);
 
 	ram32[A_EEXIT_PTR/4] = SWAP32(A_EEXIT_DEF);
@@ -4006,6 +4109,7 @@ void psxBiosException() {
 	sp = fp = loadRam32(A_EXC_SP);
 	gp = A_EXC_GP;
 	use_cycles(46);
+	assert(!psxRegs.cpuInRecursion);
 
 	// do the chains (always 4)
 	for (c = lim = 0; c < 4; c++) {
@@ -4057,7 +4161,8 @@ static void hleA0() {
 	u32 call = t1 & 0xff;
 	u32 entry = loadRam32(A_A0_TABLE + call * 4);
 
-	if (call < 192 && entry != A_A0_DUMMY) {
+	use_cycles(4+7);
+	if (call < 192 && entry != A_A0_TRAPS + call * 4) {
 		PSXBIOS_LOG("custom A%02x %s(0x%x, )  addr=%08x ra=%08x\n",
 			call, biosA0n[call], a0, entry, ra);
 		softCall(entry);
@@ -4067,6 +4172,7 @@ static void hleA0() {
 	else if (biosA0[call])
 		biosA0[call]();
 
+	//printf("A(%02x) -> %x\n", call, v0);
 	psxBranchTest();
 }
 
@@ -4075,10 +4181,11 @@ static void hleB0() {
 	u32 entry = loadRam32(A_B0_TABLE + call * 4);
 	int is_custom = 0;
 
+	use_cycles(4+7);
 	if (call == 0x5b)
-		is_custom = entry != A_B0_5B_DUMMY;
+		is_custom = entry != A_B0_5B_TRAP;
 	else
-		is_custom = entry != A_B0_DUMMY;
+		is_custom = entry != A_B0_TRAPS + call * 4;
 	if (is_custom) {
 		PSXBIOS_LOG("custom B%02x %s(0x%x, )  addr=%08x ra=%08x\n",
 			call, biosB0n[call], a0, entry, ra);
@@ -4089,6 +4196,7 @@ static void hleB0() {
 	else if (biosB0[call])
 		biosB0[call]();
 
+	//printf("B(%02x) -> %x\n", call, v0);
 	psxBranchTest();
 }
 
@@ -4096,7 +4204,8 @@ static void hleC0() {
 	u32 call = t1 & 0xff;
 	u32 entry = loadRam32(A_C0_TABLE + call * 4);
 
-	if (call < 128 && entry != A_C0_DUMMY) {
+	use_cycles(4+7);
+	if (call < 128 && entry != A_C0_TRAPS + call * 4) {
 		PSXBIOS_LOG("custom C%02x %s(0x%x, )  addr=%08x ra=%08x\n",
 			call, biosC0n[call], a0, entry, ra);
 		softCall(entry);
@@ -4106,6 +4215,48 @@ static void hleC0() {
 	else if (biosC0[call])
 		biosC0[call]();
 
+	//printf("C(%02x) -> %x\n", call, v0);
+	psxBranchTest();
+}
+
+static void hleA0t() {
+	u32 call = (pc0 - A_A0_TRAPS) / 4 - 1;
+	if (call >= 256u || !biosA0[call]) {
+		log_unhandled("unexpected A trap @%08x ra=%08x\n", pc0 - 4, ra);
+		mips_return_void_c(1000);
+	}
+	else
+		biosA0[call]();
+
+	//printf("A(%02x) -> %x\n", call, v0);
+	psxBranchTest();
+}
+
+static void hleB0t() {
+	u32 call = (pc0 - A_B0_TRAPS) / 4 - 1;
+	if (pc0 - 4 == A_B0_5B_TRAP)
+		call = 0x5b;
+	if (call >= 256u || !biosB0[call]) {
+		log_unhandled("unexpected B trap @%08x ra=%08x\n", pc0 - 4, ra);
+		mips_return_void_c(1000);
+	}
+	else
+		biosB0[call]();
+
+	//printf("B(%02x) -> %x\n", call, v0);
+	psxBranchTest();
+}
+
+static void hleC0t() {
+	u32 call = (pc0 - A_C0_TRAPS) / 4 - 1;
+	if (call >= 128u || !biosC0[call]) {
+		log_unhandled("unexpected C trap @%08x ra=%08x\n", pc0 - 4, ra);
+		mips_return_void_c(1000);
+	}
+	else
+		biosC0[call]();
+
+	//printf("C(%02x) -> %x\n", call, v0);
 	psxBranchTest();
 }
 
@@ -4130,7 +4281,7 @@ static void hleExecRet() {
 	psxRegs.pc = ra;
 }
 
-void (* const psxHLEt[24])() = {
+void (* const psxHLEt[hleop_count_])() = {
 	hleDummy, hleA0, hleB0, hleC0,
 	hleBootstrap, hleExecRet, psxBiosException, hleDummy,
 	hleExc0_0_1, hleExc0_0_2,
@@ -4141,8 +4292,78 @@ void (* const psxHLEt[24])() = {
 	hleExc1_3_1, hleExc1_3_2,
 	hleExc3_0_2_defint,
 	hleExcPadCard1, hleExcPadCard2,
+	hleA0t, hleB0t, hleC0t,
 };
 
+void psxBiosCheckExe(u32 t_addr, u32 t_size, int loading_state)
+{
+	// lw      $v0, 0x10($sp)
+	// nop
+	// addiu   $v0, -1
+	// sw      $v0, 0x10($sp)
+	// lw      $v0, 0x10($sp)
+	// nop
+	// bne     $v0, $v1, not_timeout
+	// nop
+	// lui     $a0, ...
+	static const u8 pattern[] = {
+		0x10, 0x00, 0xA2, 0x8F, 0x00, 0x00, 0x00, 0x00,
+		0xFF, 0xFF, 0x42, 0x24, 0x10, 0x00, 0xA2, 0xAF,
+		0x10, 0x00, 0xA2, 0x8F, 0x00, 0x00, 0x00, 0x00,
+		0x0C, 0x00, 0x43, 0x14, 0x00, 0x00, 0x00, 0x00,
+	};
+	u32 start = t_addr & 0x1ffffc;
+	u32 end = (start + t_size) & 0x1ffffc;
+	u32 buf[sizeof(pattern) / sizeof(u32)];
+	const u32 *r32 = (u32 *)(psxM + start);
+	u32 i, j;
+
+	if (end <= start)
+		return;
+	if (!Config.HLE)
+		return;
+
+	memcpy(buf, pattern, sizeof(buf));
+	for (i = 0; i < t_size / 4; i += j + 1) {
+		for (j = 0; j < sizeof(buf) / sizeof(buf[0]); j++)
+			if (r32[i + j] != buf[j])
+				break;
+		if (j != sizeof(buf) / sizeof(buf[0]))
+			continue;
+
+		if ((SWAP32(r32[i + j]) >> 16) != 0x3c04) // lui
+			continue;
+		if (!loading_state)
+			SysPrintf("HLE vsync @%08x\n", start + i * 4);
+		psxRegs.biosBranchCheck = (t_addr & 0xa01ffffc) + i * 4;
+	}
+}
+
+void psxBiosCheckBranch(void)
+{
+#if 1
+	// vsync HLE hack
+	static u32 cycles_prev, v0_prev;
+	u32 cycles_passed, waste_cycles;
+	u32 loops, v0_expect = v0_prev - 1;
+	if (v0 != 1)
+		return;
+	execI(&psxRegs);
+	cycles_passed = psxRegs.cycle - cycles_prev;
+	cycles_prev = psxRegs.cycle;
+	v0_prev = v0;
+	if (cycles_passed < 10 || cycles_passed > 50 || v0 != v0_expect)
+		return;
+
+	waste_cycles = schedule_timeslice() - psxRegs.cycle;
+	loops = waste_cycles / cycles_passed;
+	if (loops > v0)
+		loops = v0;
+	v0 -= loops;
+	psxRegs.cycle += loops * cycles_passed;
+	//printf("c %4u %d\n", loops, cycles_passed);
+#endif
+}
 
 #define bfreeze(ptr, size) { \
 	if (Mode == 1) memcpy(&psxR[base], ptr, size); \