From 0b1da49108ea0344f762d78c03c2d6eff2b21069 Mon Sep 17 00:00:00 2001
From: notaz <notasas@gmail.com>
Date: Sat, 12 Aug 2023 19:01:22 +0300
Subject: [PATCH] emulate pending irq bit somewhat

---
 libpcsxcore/new_dynarec/events.c |  7 +++++--
 libpcsxcore/r3000a.c             | 16 ++++++----------
 2 files changed, 11 insertions(+), 12 deletions(-)

diff --git a/libpcsxcore/new_dynarec/events.c b/libpcsxcore/new_dynarec/events.c
index 71aed6b2..2a06c1f9 100644
--- a/libpcsxcore/new_dynarec/events.c
+++ b/libpcsxcore/new_dynarec/events.c
@@ -68,8 +68,11 @@ static void irq_test(psxCP0Regs *cp0)
 		}
 	}
 
-	if ((psxHu32(0x1070) & psxHu32(0x1074)) && (cp0->n.SR & 0x401) == 0x401) {
-		psxException(0x400, 0, cp0);
+	cp0->n.Cause &= ~0x400;
+	if (psxHu32(0x1070) & psxHu32(0x1074))
+		cp0->n.Cause |= 0x400;
+	if (((cp0->n.Cause | 1) & cp0->n.SR & 0x401) == 0x401) {
+		psxException(0, 0, cp0);
 		pending_exception = 1;
 	}
 }
diff --git a/libpcsxcore/r3000a.c b/libpcsxcore/r3000a.c
index 8351c949..0be8a53c 100644
--- a/libpcsxcore/r3000a.c
+++ b/libpcsxcore/r3000a.c
@@ -109,7 +109,7 @@ void psxException(u32 cause, enum R3000Abdt bdt, psxCP0Regs *cp0) {
 	}
 
 	// Set the Cause
-	cp0->n.Cause = (bdt << 30) | (cp0->n.Cause & 0x300) | cause;
+	cp0->n.Cause = (bdt << 30) | (cp0->n.Cause & 0x700) | cause;
 
 	// Set the EPC & PC
 	cp0->n.EPC = bdt ? psxRegs.pc - 4 : psxRegs.pc;
@@ -196,15 +196,11 @@ void psxBranchTest() {
 		}
 	}
 
-	if (psxHu32(0x1070) & psxHu32(0x1074)) {
-		if ((psxRegs.CP0.n.SR & 0x401) == 0x401) {
-#ifdef PSXCPU_LOG
-			PSXCPU_LOG("Interrupt: %x %x\n", psxHu32(0x1070), psxHu32(0x1074));
-#endif
-//			SysPrintf("Interrupt (%x): %x %x\n", psxRegs.cycle, psxHu32(0x1070), psxHu32(0x1074));
-			psxException(0x400, 0, &psxRegs.CP0);
-		}
-	}
+	psxRegs.CP0.n.Cause &= ~0x400;
+	if (psxHu32(0x1070) & psxHu32(0x1074))
+		psxRegs.CP0.n.Cause |= 0x400;
+	if (((psxRegs.CP0.n.Cause | 1) & psxRegs.CP0.n.SR & 0x401) == 0x401)
+		psxException(0, 0, &psxRegs.CP0);
 }
 
 void psxJumpTest() {
-- 
2.39.2