From patchwork Sun Feb 27 16:28:24 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Guo Ren X-Patchwork-Id: 12761957 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 263F1C433FE for ; Sun, 27 Feb 2022 16:30:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231854AbiB0QbV (ORCPT ); Sun, 27 Feb 2022 11:31:21 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57936 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231723AbiB0Qa7 (ORCPT ); Sun, 27 Feb 2022 11:30:59 -0500 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 76E8D6E4E4; Sun, 27 Feb 2022 08:30:12 -0800 (PST) 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 028C1B80CDE; Sun, 27 Feb 2022 16:30:11 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id C803BC36AE9; Sun, 27 Feb 2022 16:30:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1645979409; bh=gBbgf5kf3c5mmUEjAYay2wu7mAYR3Ivcy9PEqe9Gg2c=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=hjbqRvCdQb4QvoBVDG1JMDwjGno3L3iuSBwozvdqRf67T3QgSSGKJFQ/56ni8Fs6V HOYkBe3k5SomMVdcmz2/+NYgLypNmc3LYGqKsTIrlYwkO3kyhc3kQjcEtKwIf0koRe KkjBPdpMFZHua7JAt41BojHCojrRdqZl7UdjEiZdoc/5Q7od9fGAV73O0btlVvzK3N 65N7IARvPqXG+SfQcPkFRlFJjMm7eXawilVMsZLoFQrE4LsRejOdLiWoLxfsfYa29I CH0hi6oUfWG+jZ3ObojIPbqRLlUT1p3UPS2/i9B0UWUsDCp7tHYXvI+cnOsN0fZGzI 2qAEb24o31ihA== From: guoren@kernel.org To: guoren@kernel.org, palmer@dabbelt.com, arnd@arndb.de, anup@brainfault.org, gregkh@linuxfoundation.org, liush@allwinnertech.com, wefu@redhat.com, drew@beagleboard.org, wangjunqiang@iscas.ac.cn, hch@lst.de Cc: linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org, linux-csky@vger.kernel.org, linux-s390@vger.kernel.org, sparclinux@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-parisc@vger.kernel.org, linux-mips@vger.kernel.org, linux-arm-kernel@lists.infradead.org, x86@kernel.org, Guo Ren Subject: [PATCH V7 13/20] riscv: compat: process: Add UXL_32 support in start_thread Date: Mon, 28 Feb 2022 00:28:24 +0800 Message-Id: <20220227162831.674483-14-guoren@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220227162831.674483-1-guoren@kernel.org> References: <20220227162831.674483-1-guoren@kernel.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org From: Guo Ren If the current task is in COMPAT mode, set SR_UXL_32 in status for returning userspace. We need CONFIG _COMPAT to prevent compiling errors with rv32 defconfig. Signed-off-by: Guo Ren Signed-off-by: Guo Ren Cc: Arnd Bergmann Cc: Palmer Dabbelt --- arch/riscv/kernel/process.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/arch/riscv/kernel/process.c b/arch/riscv/kernel/process.c index 03ac3aa611f5..54787ca9806a 100644 --- a/arch/riscv/kernel/process.c +++ b/arch/riscv/kernel/process.c @@ -97,6 +97,11 @@ void start_thread(struct pt_regs *regs, unsigned long pc, } regs->epc = pc; regs->sp = sp; + + if (is_compat_task()) + regs->status = (regs->status & ~SR_UXL) | SR_UXL_32; + else + regs->status = (regs->status & ~SR_UXL) | SR_UXL_64; } void flush_thread(void)