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=-15.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,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 B5C8EC433E0 for ; Mon, 22 Mar 2021 22:54:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 874AA6146D for ; Mon, 22 Mar 2021 22:54:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230085AbhCVWxj (ORCPT ); Mon, 22 Mar 2021 18:53:39 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45036 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230258AbhCVWxQ (ORCPT ); Mon, 22 Mar 2021 18:53:16 -0400 Received: from mail-pg1-x536.google.com (mail-pg1-x536.google.com [IPv6:2607:f8b0:4864:20::536]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4538AC061574 for ; Mon, 22 Mar 2021 15:53:16 -0700 (PDT) Received: by mail-pg1-x536.google.com with SMTP id u19so9786162pgh.10 for ; Mon, 22 Mar 2021 15:53:16 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=r+51m+w++y282pEpZcxM+4YOYzwIDkEbVJ47KIbTcl4=; b=QfXGEo5ueK2zr6oSJZYJYzRNkYnWQhD8Sox7sDDDttvRWM3EmyOUol7F4aqSEgP9NP GHQnkPJruXk3pdfbHAo3tir2mS9ZA+cqMqUYRBtFasSBiTyNXM6kW5xisTwJ4HKI0/SG Uhh0LjBwDYD72X3FfxRExA1v97vyHlTnxd8Twrvz/8nr5vPakPsWmkvzpeDp1FJzmMut ndWh0ftdPenGyc2vKPW3wQPc7/rAEs2LD5kFnJsANnSapLQ/Hp5PT+1MbvPgSryZe3FR bBzJrrxt8kQtMJG2L0bksMtfdja64mazMcYG7Hi2tzHeSn76MoHgnEYU1Piswjozpi5E rybw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=r+51m+w++y282pEpZcxM+4YOYzwIDkEbVJ47KIbTcl4=; b=IL2WqqMYdcqBQu8M2dhTowluavlb0CTl59+lustJT8AkP+x7tM3ZoMNmNbQT6p92vp qMwzNrGJTbXkf140Uk1Sien5p9REhAfH43cpQe4yf6iKYEe8dHW+Uih19f6ZJiH+pFk/ ScaXPVeEPflM8hridUSnE83zFwuCtwoeU7NYN16TExUWeDorvUVU3wYv3Op+zyftnn1i tkgBseldf9tarRJYlMce3RZQniuAOZEFF0IL1HbdHYec013WCh1CbDyBh3SVeo1UMgat lWSxvuBVBYvzJoE/E6dJx4T6RbgAMUuDFjppzmNrtWf2+GQ7EKevA+omNil1/A+joYql kcCA== X-Gm-Message-State: AOAM532lr6C/8IBuimR4T4Md38iY6XGRqFK83MJZOOlt4WL4JNHfeKLI r4OJYeEi5zl23Ooe70AF5yc= X-Google-Smtp-Source: ABdhPJxcPnFhka+fUqaouhyTukjRJoxO4TigJeQgAm0gNpQv6Kfi5Gbox/7siMadBCOwpDd+Ln8aUA== X-Received: by 2002:a05:6a00:72b:b029:218:6603:a6a9 with SMTP id 11-20020a056a00072bb02902186603a6a9mr1900419pfm.78.1616453595715; Mon, 22 Mar 2021 15:53:15 -0700 (PDT) Received: from laptop.hsd1.wa.comcast.net ([2601:600:8500:5f14:d627:c51e:516e:a105]) by smtp.gmail.com with ESMTPSA id j13sm8878211pfn.103.2021.03.22.15.53.14 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 22 Mar 2021 15:53:14 -0700 (PDT) From: Andrei Vagin To: Will Deacon , Catalin Marinas Cc: Oleg Nesterov , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Andrei Vagin , Dave Martin , Keno Fischer Subject: [PATCH 1/4] arm64: expose orig_x0 in the user_pt_regs structure Date: Mon, 22 Mar 2021 15:50:50 -0700 Message-Id: <20210322225053.428615-2-avagin@gmail.com> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20210322225053.428615-1-avagin@gmail.com> References: <20210322225053.428615-1-avagin@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org orig_x0 is recorded at the start of the syscall entry and then it is used for resetting the argument back to its original value during syscall restarts. If orig_x0 isn't available from user-space, this makes it tricky to manage arguments of restarted system calls. Cc: Keno Fischer Signed-off-by: Andrei Vagin --- arch/arm64/include/asm/ptrace.h | 2 +- arch/arm64/include/uapi/asm/ptrace.h | 1 + 2 files changed, 2 insertions(+), 1 deletion(-) diff --git a/arch/arm64/include/asm/ptrace.h b/arch/arm64/include/asm/ptrace.h index e58bca832dff..d4cdf98ac003 100644 --- a/arch/arm64/include/asm/ptrace.h +++ b/arch/arm64/include/asm/ptrace.h @@ -183,9 +183,9 @@ struct pt_regs { u64 sp; u64 pc; u64 pstate; + u64 orig_x0; }; }; - u64 orig_x0; #ifdef __AARCH64EB__ u32 unused2; s32 syscallno; diff --git a/arch/arm64/include/uapi/asm/ptrace.h b/arch/arm64/include/uapi/asm/ptrace.h index 758ae984ff97..3c118c5b0893 100644 --- a/arch/arm64/include/uapi/asm/ptrace.h +++ b/arch/arm64/include/uapi/asm/ptrace.h @@ -90,6 +90,7 @@ struct user_pt_regs { __u64 sp; __u64 pc; __u64 pstate; + __u64 orig_x0; }; struct user_fpsimd_state { -- 2.29.2