From: notaz <notasas@gmail.com>
Date: Sun, 27 Aug 2023 14:39:54 +0000 (+0300)
Subject: psxbios: unbreak bcopy
X-Git-Tag: r24l~219
X-Git-Url: https://notaz.gp2x.de/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=12742a5c7b839a9fad2ef87c1bd681b09ab86906;p=pcsx_rearmed.git

psxbios: unbreak bcopy

wasn't paying attention
---

diff --git a/libpcsxcore/psxbios.c b/libpcsxcore/psxbios.c
index d2c7793d..9e3f13fe 100644
--- a/libpcsxcore/psxbios.c
+++ b/libpcsxcore/psxbios.c
@@ -935,8 +935,23 @@ static void do_memcpy(u32 dst, u32 src, s32 len)
 
 static void psxBios_memcpy();
 
-static void psxBios_bcopy() { // 0x27
-	psxBios_memcpy(); // identical
+static void psxBios_bcopy() { // 0x27 - memcpy with args swapped
+	//PSXBIOS_LOG("psxBios_%s %x %x %x\n", biosA0n[0x27], a0, a1, a2);
+	u32 ret = a0, cycles = 0;
+	if (a0 == 0) // ...but it checks src this time
+	{
+		mips_return_c(0, 4);
+		return;
+	}
+	v1 = a0;
+	if ((s32)a2 > 0) {
+		do_memcpy(a1, a0, a2);
+		cycles = a2 * 6;
+		a0 += a2;
+		a1 += a2;
+		a2 = 0;
+	}
+	mips_return_c(ret, cycles + 5);
 }
 
 static void psxBios_bzero() { // 0x28