From patchwork Thu Nov 5 05:16:55 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Christopher M. Riedl" X-Patchwork-Id: 1394724 Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Received: from lists.ozlabs.org (lists.ozlabs.org [203.11.71.2]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 4CRWt22rjHz9sSs for ; Thu, 5 Nov 2020 16:14:50 +1100 (AEDT) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=codefail.de Received: from bilbo.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 4CRWt21QTTzDqlQ for ; Thu, 5 Nov 2020 16:14:50 +1100 (AEDT) X-Original-To: linuxppc-dev@lists.ozlabs.org Delivered-To: linuxppc-dev@lists.ozlabs.org Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=codefail.de (client-ip=198.54.127.80; helo=se17-1.privateemail.com; envelope-from=cmr@codefail.de; receiver=) Authentication-Results: lists.ozlabs.org; dmarc=none (p=none dis=none) header.from=codefail.de Received: from se17-1.privateemail.com (se17-1.privateemail.com [198.54.127.80]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4CRWrZ5LdYzDqhD for ; Thu, 5 Nov 2020 16:13:34 +1100 (AEDT) Received: from new-01-3.privateemail.com ([198.54.122.47]) by se17.registrar-servers.com with esmtpsa (TLSv1.2:AES128-GCM-SHA256:128) (Exim 4.92) (envelope-from ) id 1kaXaS-000378-6U for linuxppc-dev@lists.ozlabs.org; Wed, 04 Nov 2020 21:13:31 -0800 Received: from MTA-11.privateemail.com (unknown [10.20.147.23]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by NEW-01-3.privateemail.com (Postfix) with ESMTPS id 1D27CA74 for ; Thu, 5 Nov 2020 05:13:28 +0000 (UTC) Received: from mta-11.privateemail.com (localhost [127.0.0.1]) by mta-11.privateemail.com (Postfix) with ESMTP id 01E9180046 for ; Thu, 5 Nov 2020 00:13:28 -0500 (EST) Received: from geist.attlocal.net (unknown [10.20.151.249]) by mta-11.privateemail.com (Postfix) with ESMTPA id C260380041 for ; Thu, 5 Nov 2020 05:13:27 +0000 (UTC) From: "Christopher M. Riedl" To: linuxppc-dev@lists.ozlabs.org Subject: [PATCH v2 2/8] powerpc/signal: Add unsafe_copy_{vsx,fpr}_from_user() Date: Wed, 4 Nov 2020 23:16:55 -0600 Message-Id: <20201105051701.25053-3-cmr@codefail.de> X-Mailer: git-send-email 2.29.0 In-Reply-To: <20201105051701.25053-1-cmr@codefail.de> References: <20201105051701.25053-1-cmr@codefail.de> MIME-Version: 1.0 X-Virus-Scanned: ClamAV using ClamSMTP X-Originating-IP: 198.54.122.47 X-SpamExperts-Domain: o3.privateemail.com X-SpamExperts-Username: out-03 Authentication-Results: registrar-servers.com; auth=pass (plain) smtp.auth=out-03@o3.privateemail.com X-SpamExperts-Outgoing-Class: ham X-SpamExperts-Outgoing-Evidence: Combined (0.07) X-Recommended-Action: accept X-Filter-ID: Mvzo4OR0dZXEDF/gcnlw0XvADx2zSFwG+3csxFBPBHmpSDasLI4SayDByyq9LIhVBKpEWXRB/2yj 5qOWfjv8W0TNWdUk1Ol2OGx3IfrIJKywOmJyM1qr8uRnWBrbSAGD34MCL/enst4vEtpA4leDRT1y xwOMUv2um0QcmoO8mg24Dcwf+CZK8NXgy3In+fX7zWpOHJR6QFwEFsLjZjV09VO05s+oip5EC/YK rMQ9+O92RfE6OSObaNx/GIkER/ho6hfscI36S5ZyZNhIm1qgiwgDRmu5tQENuqerHYiwxW7w5N/o jaomCoWWiTtol8oIjMLSPcwmNI0TQjQbbn/msxmYvSRMYhU3cO2EzUHwVXEwQzgH3ZUltkgdVMpa zhNDPjwfaB2rE/S2BhQBkwlK0UgKCrov1GasWV1vj2C+0pcXuAT86WptVNwo/cWcelODMVhfRAfm ME3CBgei5d0ipWZHuZ2luxkemtGoNxZUQqTo/wKPvFA5qTwvBasVtSz0gfFrL3927nPLXidUYhzT L3iFCDAL0QosIifn4ScHG4ifU642KNtk4n/u8nyV2xsjehIqUczFWeS6sE8e1b5/Uj/i4hYVfUxI FxiN15g3w5xXw7ICF89SRx911u2+L1VDtPQaFYH1+UC6ii/fq1Ezt9LxGEg2sm2tlgP2XvW3pgLq U7es+abtIe8TjwNfoTPy1m+Kp1KCPGoyG38yARaHof3QzxUBjDlIxq/CY6GWA8+LBDMrD7q/cJog wbqzsuoky0Qu9o0UsJYe8KzUZOzYBJq7nLN6wi0+LTtGPl8kCiqvQ3dW14fcwg6tXLnl97pefwnd cM4lFex8qnvxMplaenLYM3A6BXfvel8OEFDbU52Uoxy7ZVs22aLE5aXKh2Z2/SyswYYxeanpYW+O DenQmhIuIkxkuoNHoZV8ALzej/7m/TG6mPfH0STtFp8lq4mlVm2lHuINJIGiJ73RKeuKpUVINNG3 OVUHjoaAVY6FvR05Ix7/C9VwqPH/5QpQnZ0BJh1tDfjT4hz4J/ncsYb09chmWIDGRew9XvW9QFDz YgSG3lyuFjEDwoOBw76gv6dU X-Report-Abuse-To: spam@se5.registrar-servers.com X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: linuxppc-dev-bounces+patchwork-incoming=ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" Reuse the "safe" implementation from signal.c except for calling unsafe_copy_from_user() to copy into a local buffer. Unlike the unsafe_copy_{vsx,fpr}_to_user() functions the "copy from" functions cannot use unsafe_get_user() directly to bypass the local buffer since doing so significantly reduces signal handling performance. Signed-off-by: Christopher M. Riedl --- arch/powerpc/kernel/signal.h | 33 +++++++++++++++++++++++++++++++++ 1 file changed, 33 insertions(+) diff --git a/arch/powerpc/kernel/signal.h b/arch/powerpc/kernel/signal.h index 2559a681536e..e9aaeac0da37 100644 --- a/arch/powerpc/kernel/signal.h +++ b/arch/powerpc/kernel/signal.h @@ -53,6 +53,33 @@ unsigned long copy_ckfpr_from_user(struct task_struct *task, void __user *from); &buf[i], label);\ } while (0) +#define unsafe_copy_fpr_from_user(task, from, label) do { \ + struct task_struct *__t = task; \ + u64 __user *__f = (u64 __user *)from; \ + u64 buf[ELF_NFPREG]; \ + int i; \ + \ + unsafe_copy_from_user(buf, __f, ELF_NFPREG * sizeof(double), \ + label); \ + for (i = 0; i < ELF_NFPREG - 1; i++) \ + __t->thread.TS_FPR(i) = buf[i]; \ + __t->thread.fp_state.fpscr = buf[i]; \ +} while (0) + +#define unsafe_copy_vsx_from_user(task, from, label) do { \ + struct task_struct *__t = task; \ + u64 __user *__f = (u64 __user *)from; \ + u64 buf[ELF_NVSRHALFREG]; \ + int i; \ + \ + unsafe_copy_from_user(buf, __f, \ + ELF_NVSRHALFREG * sizeof(double), \ + label); \ + for (i = 0; i < ELF_NVSRHALFREG ; i++) \ + __t->thread.fp_state.fpr[i][TS_VSRLOWOFFSET] = buf[i]; \ +} while (0) + + #ifdef CONFIG_PPC_TRANSACTIONAL_MEM #define unsafe_copy_ckfpr_to_user(to, task, label) do { \ struct task_struct *__t = task; \ @@ -80,6 +107,10 @@ unsigned long copy_ckfpr_from_user(struct task_struct *task, void __user *from); unsafe_copy_to_user(to, (task)->thread.fp_state.fpr, \ ELF_NFPREG * sizeof(double), label) +#define unsafe_copy_fpr_from_user(task, from, label) \ + unsafe_copy_from_user((task)->thread.fp_state.fpr, from \ + ELF_NFPREG * sizeof(double), label) + static inline unsigned long copy_fpr_to_user(void __user *to, struct task_struct *task) { @@ -115,6 +146,8 @@ copy_ckfpr_from_user(struct task_struct *task, void __user *from) #else #define unsafe_copy_fpr_to_user(to, task, label) do { } while (0) +#define unsafe_copy_fpr_from_user(task, from, label) do { } while (0) + static inline unsigned long copy_fpr_to_user(void __user *to, struct task_struct *task) {