From mboxrd@z Thu Jan 1 00:00:00 1970 Received: with ECARTIS (v1.0.0; list linux-mips); Thu, 08 Nov 2018 23:00:32 +0100 (CET) Received: from mail.kernel.org ([198.145.29.99]:44932 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by eddie.linux-mips.org with ESMTP id S23994561AbeKHWA2Y0nfj (ORCPT ); Thu, 8 Nov 2018 23:00:28 +0100 Received: from localhost (unknown [208.72.13.198]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 4C5BC20989; Thu, 8 Nov 2018 22:00:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1541714427; bh=qh/itS1sUc+hgT3Vk5UI+RKtFPsW0Z72Db7BN3jzqwc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=iC/18oS3QfjNMcWz6yRxtw0M9CSLgbPilmj8lhQ93jYjTJ8GybLA2SnqMUY6/w2IN 3gApwHrDK1mW9YP2lgK6RHGOVSUpKV9RhIYUsdnmUe+35400Z4AtMY+mhtsDuvZcNQ +j6DcT5zD2vzHyDDzbrr7S9vAFLS/Fu6HT4jINd0= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Paul Burton , Matt Redfearn , James Hogan , Marcin Nowakowski , Miodrag Dinic , Ingo Molnar , David Daney , linux-mips@linux-mips.org, Ralf Baechle , Sasha Levin Subject: [PATCH 4.4 081/114] MIPS: microMIPS: Fix decoding of swsp16 instruction Date: Thu, 8 Nov 2018 13:51:36 -0800 Message-Id: <20181108215108.269018818@linuxfoundation.org> X-Mailer: git-send-email 2.19.1 In-Reply-To: <20181108215059.051093652@linuxfoundation.org> References: <20181108215059.051093652@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Return-Path: X-Envelope-To: <"|/home/ecartis/ecartis -s linux-mips"> (uid 0) X-Orcpt: rfc822;linux-mips@linux-mips.org Original-Recipient: rfc822;linux-mips@linux-mips.org X-archive-position: 67182 X-ecartis-version: Ecartis v1.0.0 Sender: linux-mips-bounce@linux-mips.org Errors-to: linux-mips-bounce@linux-mips.org X-original-sender: gregkh@linuxfoundation.org Precedence: bulk List-help: List-unsubscribe: List-software: Ecartis version 1.0.0 List-Id: linux-mips X-List-ID: linux-mips List-subscribe: List-owner: List-post: List-archive: X-list: linux-mips 4.4-stable review patch. If anyone has any objections, please let me know. ------------------ [ Upstream commit cea8cd498f4f1c30ea27e3664b3c671e495c4fce ] When the immediate encoded in the instruction is accessed, it is sign extended due to being a signed value being assigned to a signed integer. The ISA specifies that this operation is an unsigned operation. The sign extension leads us to incorrectly decode: 801e9c8e: cbf1 sw ra,68(sp) As having an immediate of 1073741809. Since the instruction format does not specify signed/unsigned, and this is currently the only location to use this instuction format, change it to an unsigned immediate. Fixes: bb9bc4689b9c ("MIPS: Calculate microMIPS ra properly when unwinding the stack") Suggested-by: Paul Burton Signed-off-by: Matt Redfearn Reviewed-by: James Hogan Cc: Marcin Nowakowski Cc: Miodrag Dinic Cc: Ingo Molnar Cc: David Daney Cc: linux-mips@linux-mips.org Cc: linux-kernel@vger.kernel.org Patchwork: https://patchwork.linux-mips.org/patch/16957/ Signed-off-by: Ralf Baechle Signed-off-by: Sasha Levin --- arch/mips/include/uapi/asm/inst.h | 2 +- arch/mips/kernel/process.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/mips/include/uapi/asm/inst.h b/arch/mips/include/uapi/asm/inst.h index 9b44d5a816fa..1b6f2f219298 100644 --- a/arch/mips/include/uapi/asm/inst.h +++ b/arch/mips/include/uapi/asm/inst.h @@ -846,7 +846,7 @@ struct mm16_r3_format { /* Load from global pointer format */ struct mm16_r5_format { /* Load/store from stack pointer format */ __BITFIELD_FIELD(unsigned int opcode : 6, __BITFIELD_FIELD(unsigned int rt : 5, - __BITFIELD_FIELD(signed int simmediate : 5, + __BITFIELD_FIELD(unsigned int imm : 5, __BITFIELD_FIELD(unsigned int : 16, /* Ignored */ ;)))) }; diff --git a/arch/mips/kernel/process.c b/arch/mips/kernel/process.c index a9cc74354df8..ebd8a715fe38 100644 --- a/arch/mips/kernel/process.c +++ b/arch/mips/kernel/process.c @@ -207,7 +207,7 @@ static inline int is_ra_save_ins(union mips_instruction *ip, int *poff) if (ip->mm16_r5_format.rt != 31) return 0; - *poff = ip->mm16_r5_format.simmediate; + *poff = ip->mm16_r5_format.imm; *poff = (*poff << 2) / sizeof(ulong); return 1; -- 2.17.1