From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755723AbbAGFwa (ORCPT ); Wed, 7 Jan 2015 00:52:30 -0500 Received: from mail-pd0-f169.google.com ([209.85.192.169]:40737 "EHLO mail-pd0-f169.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754907AbbAGFwZ (ORCPT ); Wed, 7 Jan 2015 00:52:25 -0500 From: Leo Yan To: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Catalin Marinas , Will Deacon Cc: Leo Yan , Xiaolong Ye Subject: [PATCH] arm64: mm: support instruction SETEND Date: Wed, 7 Jan 2015 13:52:10 +0800 Message-Id: <1420609930-1689-1-git-send-email-leo.yan@linaro.org> X-Mailer: git-send-email 1.9.1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Currently kernel has set the bit SCTLR_EL1.SED, so the SETEND instruction will be treated as UNALLOCATED; this error can be reproduced when ARMv8 cpu runs with EL1/aarch64 and EL0/aarch32 mode, finally kernel will trap the exception if the userspace libs use SETEND instruction. So this patch clears bit SCTLR_EL1.SED to support SETEND instruction. Signed-off-by: Leo Yan Signed-off-by: Xiaolong Ye --- arch/arm64/mm/proc.S | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/arch/arm64/mm/proc.S b/arch/arm64/mm/proc.S index 4e778b1..66a7363 100644 --- a/arch/arm64/mm/proc.S +++ b/arch/arm64/mm/proc.S @@ -249,9 +249,9 @@ ENDPROC(__cpu_setup) * CE0 XWHW CZ ME TEEA S * .... .IEE .... NEAI TE.I ..AD DEN0 ACAM * 0011 0... 1101 ..0. ..0. 10.. .... .... < hardware reserved - * .... .1.. .... 01.1 11.1 ..01 0001 1101 < software settings + * .... .1.. .... 01.1 11.1 ..00 0001 1101 < software settings */ .type crval, #object crval: - .word 0x000802e2 // clear - .word 0x0405d11d // set + .word 0x000803e2 // clear + .word 0x0405d01d // set -- 1.9.1