From patchwork Mon Jul 4 18:13:30 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mark Brown X-Patchwork-Id: 12905773 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 07355C433EF for ; Mon, 4 Jul 2022 18:14:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233539AbiGDSO6 (ORCPT ); Mon, 4 Jul 2022 14:14:58 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33048 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233326AbiGDSO6 (ORCPT ); Mon, 4 Jul 2022 14:14:58 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9376FB863 for ; Mon, 4 Jul 2022 11:14:57 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 48F90B811E0 for ; Mon, 4 Jul 2022 18:14:56 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 202DDC341CF; Mon, 4 Jul 2022 18:14:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1656958495; bh=4SS1HhiCCSG9y1tYIhTUgiCAE3c544P3f86asq/gm0U=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=CW9jp+YMe6eY7y4NoxXDNeuZ4GNIRLulJ1I93h8VUfKI3cOD1e2P3ov+vCkGvkt96 3X5KEJXwCb05GHAG1JKS8MU0qA9bb1L0A+iKfNDkK3Eyyy7dWihLRSTfmc7MbKQrGj +HojrmvmTfC546E6ZIXP88gsH6j3jl0X3cKdD/y9+rLr83mNiP0KEPLR8OGo973F7b bGtE3iEkCYc0UPs/r9KuceOzVqguTzGE70DhDwSc61wGRb5PxtoiWA4I+/dPorVTpZ rJ2abVuZwBR2eCX5U7xKrHAhhTPSwIiLBGT0P6ebE+jd2nHWRSM2iy/rRjLvX74CI+ cKpdn0eAr1svw== From: Mark Brown To: Catalin Marinas , Will Deacon , Shuah Khan , Shuah Khan Cc: Alan Hayward , Luis Machado , linux-arm-kernel@lists.infradead.org, linux-kselftest@vger.kernel.org, Mark Brown Subject: [PATCH v1 2/4] arm64/ptrace: Document extension of NT_ARM_TLS to cover TPIDR2_EL0 Date: Mon, 4 Jul 2022 19:13:30 +0100 Message-Id: <20220704181332.3318214-3-broonie@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20220704181332.3318214-1-broonie@kernel.org> References: <20220704181332.3318214-1-broonie@kernel.org> MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=1023; h=from:subject; bh=4SS1HhiCCSG9y1tYIhTUgiCAE3c544P3f86asq/gm0U=; b=owEBbQGS/pANAwAKASTWi3JdVIfQAcsmYgBiwy3KjoHA7nfaC+35Gif2a+0nlfbRiTju6t1wdb9X jyFWDcOJATMEAAEKAB0WIQSt5miqZ1cYtZ/in+ok1otyXVSH0AUCYsMtygAKCRAk1otyXVSH0B8+CA CDbpf/pnNRu1N1AfwGh+sKz1lY2Wb4IWG2kDZcUVVQpvowa/GPGXO87G3EJckwvJcyF0SwGrwyTbxW 1z0sdJRY80MogwewBjWVPs+o+03yDDEL5Q4mJ2hSuWqxBLL9NXQaD+2G0ecJ1N+r71Em5PwVnBAs0c wqb1E5/SvE1OqM3TSVOtCyNof+XhFq3W8unnGYZ0G+rUdkAVm4DB1LYbTrAO8+N/WnVKQ83dqzL6qu 3XIA/V31r8/w6RcKjZXaHEoR45sguAGmKmeyvlNj/+PUCKbl5oqszC5BWEmuE9ERi939o23k483R2k IsXN4WNWlbu2x0nR6Fmts00Nk4WCcn X-Developer-Key: i=broonie@kernel.org; a=openpgp; fpr=3F2568AAC26998F9E813A1C5C3F436CA30F5D8EB Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org In order to allow debuggers to discover lazily saved SME state we need to provide access to TPIDR2_EL0, we will extend the existing NT_ARM_TLS used for TPIDR to also include TPIDR2_EL0 as the second register in the regset. Signed-off-by: Mark Brown --- Documentation/arm64/sme.rst | 3 +++ 1 file changed, 3 insertions(+) diff --git a/Documentation/arm64/sme.rst b/Documentation/arm64/sme.rst index 937147f58cc5..16d2db4c2e2e 100644 --- a/Documentation/arm64/sme.rst +++ b/Documentation/arm64/sme.rst @@ -331,6 +331,9 @@ The regset data starts with struct user_za_header, containing: been read if a PTRACE_GETREGSET of NT_ARM_ZA were executed for each thread when the coredump was generated. +* The NT_ARM_TLS note will be extended to two registers, the second register + will contain TPIDR2_EL0 on systems that support SME and will be read as + zero with writes ignored otherwise. 9. System runtime configuration --------------------------------