PERFORCE change 135043 for review

[Warner Losh]

http://perforce.freebsd.org/chv.cgi?CH=135043

Change 135043 by imp at imp_lighthouse on 2008/02/08 16:47:48

	Save/Restore v0 across the call to DO_AST in the one case where
	we need to preserve its value.

Affected files ...

.. //depot/projects/mips2-jnpr/src/sys/mips/mips/exception.S#13 edit

Differences ...

==== //depot/projects/mips2-jnpr/src/sys/mips/mips/exception.S#13 (text+ko) ====

@@ -383,8 +383,9 @@
 	sw	a3, STAND_RA_OFFSET + KERN_REG_SIZE(sp)		# for debugging
 
 	.set	at
-	/* A call to AST would step on v0, I think, do we need to save it? */
+	move	s0, v0
 	DO_AST
+	move	v0, s0
 	.set	noat
 
 	RESTORE_CPU			# v0 contains the return address.