From: Janosch Frank <frankja@linux.ibm.com>
Date: Tue, 6 Oct 2020 09:42:49 +0000 (-0400)
Subject: pc-bios: s390x: Go into disabled wait when encountering a PGM exception
X-Git-Tag: v5.2.0-rc0~70^2~2
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=25f5adea5a10fe204e41d085dff6ea94aaf80a9f;p=thirdparty%2Fqemu.git

pc-bios: s390x: Go into disabled wait when encountering a PGM exception

Let's setup a PGM PSW, so we won't load 0s when a program exception
happens. Instead we'll load a disabled wait PSW.

Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Message-Id: <20201006094249.50640-5-frankja@linux.ibm.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
---

diff --git a/pc-bios/s390-ccw/start.S b/pc-bios/s390-ccw/start.S
index ce519300a1f..4d5ad21653d 100644
--- a/pc-bios/s390-ccw/start.S
+++ b/pc-bios/s390-ccw/start.S
@@ -34,7 +34,10 @@ remainder:
 	larl	%r2,memsetxc
 	ex	%r3,0(%r2)
 done:
-	j      main		/* And call C */
+        /* set up a pgm exception disabled wait psw */
+        larl	%r2, disabled_wait_psw
+        mvc	0x01d0(16), 0(%r2)
+        j      main		/* And call C */
 
 memsetxc:
 	xc	0(1,%r1),0(%r1)