psxbios: fix wrong regs in syscall handler

diff --git a/libpcsxcore/psxbios.c b/libpcsxcore/psxbios.c
index 0f8beb0..4c097db 100644 (file)
--- a/libpcsxcore/psxbios.c
+++ b/libpcsxcore/psxbios.c
@@ -3755,9 +3755,9 @@ void hleExc0_1_2() // A(90h) - CdromIoIrqFunc1
 
 void hleExc0_2_2_syscall() // not in any A/B/C table
 {
-       u32 code = (psxRegs.CP0.n.Cause & 0x3c) >> 2;
        u32 tcbPtr = loadRam32(A_TT_PCB);
        TCB *tcb = loadRam32ptr(tcbPtr);
+       u32 code = SWAP32(tcb->cause) >> 2;
 
        if (code != R3000E_Syscall) {
                if (code != 0) {
@@ -3768,9 +3768,9 @@ void hleExc0_2_2_syscall() // not in any A/B/C table
                return;
        }
 
-       //printf("%s c=%d a0=%d\n", __func__, code, a0);
+       //printf("%s c=%d a0=%d\n", __func__, code, SWAP32(tcb->reg[4]));
        tcb->epc += SWAP32(4);
-       switch (a0) {
+       switch (SWAP32(tcb->reg[4])) { // a0
                case 0: // noop
                        break;
 
@@ -3786,7 +3786,7 @@ void hleExc0_2_2_syscall() // not in any A/B/C table
 
                case 3: { // ChangeThreadSubFunction
                        u32 tcbPtr = loadRam32(A_TT_PCB);
-                       storeRam32(tcbPtr, a1);
+                       storeRam32(tcbPtr, SWAP32(tcb->reg[5])); // a1
                        break;
                }
                default: