Real-mode code might set the direction flag, which would cause carnage.

diff --git a/src/arch/i386/transitions/librm.S b/src/arch/i386/transitions/librm.S
index e916ba57ba83c5d348153cf3e6e91c266cd3f890..2072ee3e9dfad0600d75349fb74bb99f4e9b41fc 100644 (file)
--- a/src/arch/i386/transitions/librm.S
+++ b/src/arch/i386/transitions/librm.S
@@ -472,6 +472,9 @@ real_call:
        call    *rc_function
        pushal
 
+       /* For sanity's sake, clear the direction flag as soon as possible */
+       cld
+
        /* Switch to protected mode and move register dump back to PM stack */
        movl    $RC_OFFSET_RETADDR, %ecx
        pushl   $1f