# HG changeset patch
# User Paul Boddie <paul@boddie.org.uk>
# Date 1461686571 -7200
# Node ID 34f40000b77921770310b1bb188c7f2f6bef4adc
# Parent  9973a779baf4654b228c47dfe79b33b374bc86c6
Use the exception return mechanism to invoke a task.

diff -r 9973a779baf4 -r 34f40000b779 stage2/cpu.c
--- a/stage2/cpu.c	Tue Apr 26 17:18:12 2016 +0200
+++ b/stage2/cpu.c	Tue Apr 26 18:02:51 2016 +0200
@@ -145,7 +145,13 @@
 		"lw $a3, 28($t3)\n"
 		"lw $t9, 100($t3)\n"
 		"lw $gp, 104($t3)\n"
-		"jr $t9\n"
+		"mtc0 $t9, $14\n"	/* CP0_EPC */
+		"mfc0 $t3, $12\n"	/* CP0_STATUS */
+		"ori $t3, $t3, 0x2\n"	/* EXL = 1 */
+		"mtc0 $t3, $12\n"	/* CP0_STATUS */
+		".set mips3\n"
+		"eret\n"
+		".set mips2\n"
 		"nop"
 		:
 		: "r" (asid), "r" (stack_pointer), "r" (base)