From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-10.0 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 42A68C83000 for ; Wed, 29 Apr 2020 21:21:04 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 0E63E20731 for ; Wed, 29 Apr 2020 21:21:04 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="T1/v7/Dm"; dkim=fail reason="signature verification failed" (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="Ypk9jUcX" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 0E63E20731 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=UMoXrH+DxS91uLP+9TRWAaQ2hcsgWgKFXLsgvr8jPCg=; b=T1/v7/DmfgRfvv xZ8AbJC9H3vh8wgKiVISimBAU3k0UozO4bwUu8U0AubMC3TG9ICOFr0j4+nEAVVZq/RN+S1N3WWlh J2NcQdfOeY1+XFsxXroFGsSntMTU0NCCPUyDzt762b+yPA87oWKEAOsXSxkfTsl4mhxKOYCNl7sNj /WweRzglmo11fLyQ/18fzPXLjrFJbpzSHixHyKV4r9oV+4lkt12DetTg3qAtPpe8Ot68A3JckKnZS fRXMsauNpkTvIqe55dyxQ4hnp4B8d1we9Y4kc6gBrlkbWqAp/s2AcL5l/R914NPUwGdUSW699L4/b xmXwmmFEao8zm8BpJS8A==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1jTu8a-0000j0-Qt; Wed, 29 Apr 2020 21:21:00 +0000 Received: from mail.kernel.org ([198.145.29.99]) by bombadil.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1jTu7c-00065a-1i for linux-arm-kernel@lists.infradead.org; Wed, 29 Apr 2020 21:20:01 +0000 Received: from localhost (fw-tnat.cambridge.arm.com [217.140.96.140]) (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 DC63C2076B; Wed, 29 Apr 2020 21:19:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1588195199; bh=1ClEF24KkovzjqfQabT0MQwh0TRA0Cbu70zzC6fhiNc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Ypk9jUcXTsM3HHxWtGTDh7cKKVcc4XPzeucqzgXX+N6MggU98L32dDwIUjs6Nd9GF 0FH4gAg5RmIensKJ+YamEIQAam70AqTkoFL04EQ348WSqkZRv6mqzimgLx4bBiBfXi IuTP7hTGCjOwvVlsCztc73niIy0qctn3yhUHBhJM= From: Mark Brown To: Vincenzo Frascino , Will Deacon , Catalin Marinas Subject: [PATCH v2 02/10] arm64: asm: Override SYM_FUNC_START when building the kernel with BTI Date: Wed, 29 Apr 2020 22:16:33 +0100 Message-Id: <20200429211641.9279-3-broonie@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200429211641.9279-1-broonie@kernel.org> References: <20200429211641.9279-1-broonie@kernel.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200429_142000_138359_5F7BE02C X-CRM114-Status: GOOD ( 11.27 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mark Brown , Kees Cook , linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org When the kernel is built for BTI override SYM_FUNC_START and related macros to add a BTI landing pad to the start of all global functions, ensuring that they are BTI safe. The ; at the end of the BTI_C macro is for the benefit of the macro-generated functions in xen-hypercall.S. Signed-off-by: Mark Brown --- arch/arm64/include/asm/linkage.h | 46 ++++++++++++++++++++++++++++++++ 1 file changed, 46 insertions(+) diff --git a/arch/arm64/include/asm/linkage.h b/arch/arm64/include/asm/linkage.h index ebee3113a62f..d8d5b0f77216 100644 --- a/arch/arm64/include/asm/linkage.h +++ b/arch/arm64/include/asm/linkage.h @@ -4,6 +4,52 @@ #define __ALIGN .align 2 #define __ALIGN_STR ".align 2" +#ifdef CONFIG_ARM64_BTI_KERNEL + +/* + * Since current versions of gas reject the BTI instruction unless we + * set the architecture version to v8.5 we use the hint instruction + * instead. + */ +#define BTI_C hint 34 ; +#define BTI_J hint 36 ; + +/* + * When using in-kernel BTI we need to ensure that assembly functions + * have suitable annotations. Override SYM_FUNC_START to insert a BTI + * landing pad at the start of everything. + */ +#define SYM_FUNC_START(name) \ + SYM_START(name, SYM_L_GLOBAL, SYM_A_ALIGN) \ + BTI_C + +#define SYM_FUNC_START_NOALIGN(name) \ + SYM_START(name, SYM_L_GLOBAL, SYM_A_NONE) \ + BTI_C + +#define SYM_FUNC_START_LOCAL(name) \ + SYM_START(name, SYM_L_LOCAL, SYM_A_ALIGN) \ + BTI_C + +#define SYM_FUNC_START_LOCAL_NOALIGN(name) \ + SYM_START(name, SYM_L_LOCAL, SYM_A_NONE) \ + BTI_C + +#define SYM_FUNC_START_WEAK(name) \ + SYM_START(name, SYM_L_WEAK, SYM_A_ALIGN) \ + BTI_C + +#define SYM_FUNC_START_WEAK_NOALIGN(name) \ + SYM_START(name, SYM_L_WEAK, SYM_A_NONE) \ + BTI_C + +#define SYM_INNER_LABEL(name, linkage) \ + .type name SYM_T_NONE ASM_NL \ + SYM_ENTRY(name, linkage, SYM_A_NONE) \ + BTI_J + +#endif + /* * Annotate a function as position independent, i.e., safe to be called before * the kernel virtual mapping is activated. -- 2.20.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel