From patchwork Fri Nov 16 15:47:41 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Christophe Lyon X-Patchwork-Id: 151361 Delivered-To: patch@linaro.org Received: by 2002:a2e:299d:0:0:0:0:0 with SMTP id p29-v6csp589616ljp; Fri, 16 Nov 2018 07:52:53 -0800 (PST) X-Google-Smtp-Source: AJdET5e148UhCroHp/StGSvUXx+BJuizmysy0Dd3iCQAubrSErTluzK65ZSXMIRdySxGswEKSU1t X-Received: by 2002:a63:4c04:: with SMTP id z4mr10470912pga.312.1542383573023; Fri, 16 Nov 2018 07:52:53 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1542383573; cv=none; d=google.com; s=arc-20160816; b=Jx1EAwSowoJwZlUO9K3Rtwd/SeUUgKr/CCi6HvAsqExfhWmbY+423NNeFnpg7vWQOo n1/zhD0wo+KuC2PKAxsgG6cnmVfqY+9KfVGazxPegm+q/dIsgVS3JTae4FyDV91L2drQ xnpMx3lSxvcjJ7ZIsFN5LAQnHRiZxxXnNZ7kUZS1RF+yM5aAR8vEu5mg/j2PoTeRdQaP ewtgRacW2egW5h4VH9/LOJZH19pUc3EDJw/ERiXHjA/MuaJl0F1yNsyIX0F7ydmOFNWF 3OHPKgZ7k1WBgSIeLyyEz2mhdV5UMmwCSUaNPcVfR/ourDvHppD2wRT4xroW2r0Ld6NI LhDg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:delivered-to:sender:list-help :list-post:list-archive:list-unsubscribe:list-id:precedence :mailing-list:dkim-signature:domainkey-signature; bh=cHl2PUgm9VZrqHbeIwCfV/Fb2uBseeIxyXbkvN/1eMM=; b=npwRwrxoXBZUqivvgOJGuivEOyC3q5VPRw8XCjulRQDX2WEYjS5C6mNpTMy5uCLizZ ElrDLVeGlxd2ZIZCl1VHaEAuUoVafzgMTWbILW/RO+kyAJfNk+KHUVICbe0m83GoAktI +Y4byhuVgOA9oGSVD5N30RMb5JN99AhQLg9tD+yb0kiA9DI51/GL8tRPRtheefnp0dtx ypGsalyo8epYXcp+F7GH4yZy2RZWA3feWx7hzdhN/EHR6SWfyb9WlkDiVz2rhuN2ws8r EUf9cYJ/ooBhP2hcVR3iGHk/In748M4UtNIoZOVpFs7pz4KImg8oX7sF7MtzUaCq9Lr7 Sflg== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@gcc.gnu.org header.s=default header.b=u7fOxF2e; spf=pass (google.com: domain of gcc-patches-return-490276-patch=linaro.org@gcc.gnu.org designates 209.132.180.131 as permitted sender) smtp.mailfrom="gcc-patches-return-490276-patch=linaro.org@gcc.gnu.org" Return-Path: Received: from sourceware.org (server1.sourceware.org. [209.132.180.131]) by mx.google.com with ESMTPS id g5-v6si29397117pgl.419.2018.11.16.07.52.52 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 16 Nov 2018 07:52:53 -0800 (PST) Received-SPF: pass (google.com: domain of gcc-patches-return-490276-patch=linaro.org@gcc.gnu.org designates 209.132.180.131 as permitted sender) client-ip=209.132.180.131; Authentication-Results: mx.google.com; dkim=pass header.i=@gcc.gnu.org header.s=default header.b=u7fOxF2e; spf=pass (google.com: domain of gcc-patches-return-490276-patch=linaro.org@gcc.gnu.org designates 209.132.180.131 as permitted sender) smtp.mailfrom="gcc-patches-return-490276-patch=linaro.org@gcc.gnu.org" DomainKey-Signature: a=rsa-sha1; c=nofws; d=gcc.gnu.org; h=list-id :list-unsubscribe:list-archive:list-post:list-help:sender:from :to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-type:content-transfer-encoding; q=dns; s= default; b=vW6bC7GPQKrsXqqKN4R1F5EchneCT4pKztiqAkiKnYFBqouBghi7+ m1ygzSfnjsrbrBZNNIWAgcWcqij3QY3R/QjFvFyDuihEYRlkbH8wGEqCjfy1u+L/ yZjGoB41gFmtx8ZCMrm+OENKCfS2WvwwZsho1SzbvnJRQVnujSskRU= DKIM-Signature: v=1; a=rsa-sha1; c=relaxed; d=gcc.gnu.org; h=list-id :list-unsubscribe:list-archive:list-post:list-help:sender:from :to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-type:content-transfer-encoding; s=default; bh=ZJbCtrZZwervOlkyJTUg8ylnKDw=; b=u7fOxF2ejoDkvcl/2kfRQtCH2OwZ kGDAJ4R4EZ2s5JO2Vr127QS6pHBez7EOG5Ex0g4Vy49KhvMfR74CHqnpUiCjAwsf lcg3e12fF97tE0E+OofhjoHhYt6RHzK6sq+yUpwQ5G54gDSke1/u7bAl9HU2Uzkm yicJNhejcQpln/4= Received: (qmail 19557 invoked by alias); 16 Nov 2018 15:52:41 -0000 Mailing-List: contact gcc-patches-help@gcc.gnu.org; run by ezmlm Precedence: bulk List-Id: List-Unsubscribe: List-Archive: List-Post: List-Help: Sender: gcc-patches-owner@gcc.gnu.org Delivered-To: mailing list gcc-patches@gcc.gnu.org Received: (qmail 19546 invoked by uid 89); 16 Nov 2018 15:52:40 -0000 Authentication-Results: sourceware.org; auth=none X-Spam-SWARE-Status: No, score=-27.6 required=5.0 tests=BAYES_00, GIT_PATCH_0, GIT_PATCH_1, GIT_PATCH_2, GIT_PATCH_3, RCVD_IN_DNSWL_LOW, SPF_PASS autolearn=ham version=3.3.2 spammy= X-HELO: mx07-00178001.pphosted.com Received: from mx08-00178001.pphosted.com (HELO mx07-00178001.pphosted.com) (91.207.212.93) by sourceware.org (qpsmtpd/0.93/v0.84-503-g423c35a) with ESMTP; Fri, 16 Nov 2018 15:52:39 +0000 Received: from pps.filterd (m0046661.ppops.net [127.0.0.1]) by mx08-.pphosted.com (8.16.0.21/8.16.0.21) with SMTP id wAGFiNul030535; Fri, 16 Nov 2018 16:52:37 +0100 Received: from beta.dmz-eu.st.com (beta.dmz-eu.st.com [164.129.1.35]) by mx08-00178001.pphosted.com with ESMTP id 2nsxqxrpnm-1 (version=TLSv1 cipher=ECDHE-RSA-AES256-SHA bits=256 verify=NOT); Fri, 16 Nov 2018 16:52:37 +0100 Received: from zeta.dmz-eu.st.com (zeta.dmz-eu.st.com [164.129.230.9]) by beta.dmz-eu.st.com (STMicroelectronics) with ESMTP id 5B6313A; Fri, 16 Nov 2018 15:52:36 +0000 (GMT) Received: from Webmail-eu.st.com (sfhdag5node1.st.com [10.75.127.13]) by zeta.dmz-eu.st.com (STMicroelectronics) with ESMTP id 466B02CFA; Fri, 16 Nov 2018 15:52:36 +0000 (GMT) Received: from gnb.st.com (10.75.127.45) by SFHDAG5NODE1.st.com (10.75.127.13) with Microsoft SMTP Server (TLS) id 15.0.1347.2; Fri, 16 Nov 2018 16:52:35 +0100 From: Christophe Lyon To: CC: Subject: [ARM/FDPIC v4 13/20] [ARM] FDPIC: Force LSB bit for PC in Cortex-M architecture Date: Fri, 16 Nov 2018 16:47:41 +0100 Message-ID: <20181116154808.25154-14-christophe.lyon@st.com> In-Reply-To: <20181116154808.25154-1-christophe.lyon@st.com> References: <20181116154808.25154-1-christophe.lyon@st.com> MIME-Version: 1.0 X-IsSubscribed: yes Without this, when we are unwinding across a signal frame we can jump to an even address which leads to an exception. This is needed in __gnu_persnality_sigframe_fdpic() when restoring the PC from the signal frame since the PC saved by the kernel has the LSB bit set to zero. 2018-XX-XX Christophe Lyon Mickaël Guêné libgcc/ * config/arm/unwind-arm.c (_Unwind_VRS_Set): Handle v7m architecture. Change-Id: Ie84de548226bcf1751e19a09e8f091fb3013ccea -- 2.6.3 diff --git a/libgcc/config/arm/unwind-arm.c b/libgcc/config/arm/unwind-arm.c index 564e4f13..6da6e3d 100644 --- a/libgcc/config/arm/unwind-arm.c +++ b/libgcc/config/arm/unwind-arm.c @@ -198,6 +198,11 @@ _Unwind_VRS_Result _Unwind_VRS_Set (_Unwind_Context *context, return _UVRSR_FAILED; vrs->core.r[regno] = *(_uw *) valuep; +#if defined(__ARM_ARCH_7M__) + /* Force LSB bit since we always run thumb code. */ + if (regno == 15) + vrs->core.r[regno] |= 1; +#endif return _UVRSR_OK; case _UVRSC_VFP: