From 230c3918a8ae8a65e1974659e55f8a808fe731b5 Mon Sep 17 00:00:00 2001

From: Michael Munday <[email protected]>

Date: Thu, 8 Sep 2016 19:27:24 -0400

Subject: [PATCH 20/38] [release-branch.go1.7] runtime: fix SIGILL in

 checkvectorfacility on s390x

STFLE does not necessarily write to all the double-words that are

requested. It is therefore necessary to clear the target memory

before calling STFLE in order to ensure that the facility list does

not contain false positives.

Fixes #17032.

Change-Id: I7bec9ade7103e747b72f08562fe57e6f091bd89f

Reviewed-on: https://go-review.googlesource.com/28850

Reviewed-by: Brad Fitzpatrick <[email protected]>

Reviewed-on: https://go-review.googlesource.com/31267

Reviewed-by: Michael Munday <[email protected]>

---

 src/runtime/asm_s390x.s | 1 +

 1 file changed, 1 insertion(+)

diff --git a/src/runtime/asm_s390x.s b/src/runtime/asm_s390x.s

index 896ccde..97f276c 100644

--- a/src/runtime/asm_s390x.s

+++ b/src/runtime/asm_s390x.s

@@ -20,6 +20,7 @@ TEXT runtime·checkvectorfacility(SB),NOSPLIT,$32-0

 	MOVD    $2, R0

 	MOVD	R1, tmp-32(SP)

 	MOVD    $x-24(SP), R1

+	XC	$24, 0(R1), 0(R1)

 //      STFLE   0(R1)

 	WORD    $0xB2B01000

 	MOVBZ   z-8(SP), R1

-- 

2.7.4