psxbios: unbreak bcopy

[pcsx_rearmed.git] / libpcsxcore / psxbios.c

diff --git a/libpcsxcore/psxbios.c b/libpcsxcore/psxbios.c
index 5b7633e..17d5044 100644 (file)
--- 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