Guard against corruption of top half of %esp during UNDI ISR

2008-02-13 14:58:20 +00:00 · 2008-02-13 14:58:20 +00:00 · 385b7a623d
parent c1006ffdb7
commit 385b7a623d
1 changed files with 3 additions and 0 deletions
--- a/src/arch/i386/drivers/net/undiisr.S
+++ b/src/arch/i386/drivers/net/undiisr.S
@ -64,7 +64,10 @@ chain:	/* Chain to next handler */
 	lcall	*undiisr_next_handler
 	
 exit:	/* Restore registers and return */
+	cli
 	popal
+	movzwl	%sp, %esp
+	addr32	movl -20(%esp), %esp	/* %esp isn't restored by popal */
 	popfl
 	popw	%gs
 	popw	%fs