Index: kernel/arch/ppc32/src/asm.S
===================================================================
--- kernel/arch/ppc32/src/asm.S	(revision 37e518bcb08eaccfcdca2bc0e9eca06f4ebc26d2)
+++ kernel/arch/ppc32/src/asm.S	(revision c1b455ef81f0a7d909a50b79a5328d46c6140609)
@@ -67,7 +67,7 @@
 	mr sp, r4
 
-	# %r3 is defined to hold pcb_ptr - set it to 0
-
-	xor r3, r3, r3
+	# %r6 is defined to hold pcb_ptr - set it to 0
+
+	xor r6, r6, r6
 	
 	# jump to userspace