From patchwork Sat Apr 2 13:52:49 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Guo Ren X-Patchwork-Id: 12799259 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 AAB3CC4167D for ; Sat, 2 Apr 2022 13:55:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1356006AbiDBN5U (ORCPT ); Sat, 2 Apr 2022 09:57:20 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38086 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1346866AbiDBN4d (ORCPT ); Sat, 2 Apr 2022 09:56:33 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3679AB0F; Sat, 2 Apr 2022 06:54:20 -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 dfw.source.kernel.org (Postfix) with ESMTPS id C9F4661567; Sat, 2 Apr 2022 13:54:19 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id AB084C36AE2; Sat, 2 Apr 2022 13:54:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1648907659; bh=a1P2DNQDu+Nr0wIsMe45GFTAoBbxFKExa639SNMT8Ac=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=py1EmqnyL/JK1TQDsoToy5o0nUL8/KBUq7CsOp/CuANDfS6H5pVyfcfwSbftBueOi Jdo24WBVHOcUuKcX1vSzCehzwOSpn5qwo3M1ZCKmdZHNTMTJrjgXfHQgGutc+weXN7 PGpMDltxg93nun/BjM1kbx+z5wyWMFOTYGXkGAZaFk3m9IS/4D4SKJUCTCaqhUl05S UwOoK9L2lRMJGzPH5m/EeywxSjfGyfpurz657YQF4rSD+FtzRZ291HGZKO86wUYXoG nKNqQUEaw/T5XSAtokODePKsxj/+lXQ6rQIKDD/OAtadKM1aJOZ+iMBaPNB01/symJ EgQnxbt1R8NHg== From: guoren@kernel.org To: guoren@kernel.org, palmer@dabbelt.com, arnd@arndb.de, gregkh@linuxfoundation.org, 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, heiko@sntech.de, Guo Ren Subject: [PATCH V11 13/20] riscv: compat: process: Add UXL_32 support in start_thread Date: Sat, 2 Apr 2022 21:52:49 +0800 Message-Id: <20220402135256.2691868-14-guoren@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220402135256.2691868-1-guoren@kernel.org> References: <20220402135256.2691868-1-guoren@kernel.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-parisc@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 Tested-by: Heiko Stuebner Cc: Arnd Bergmann Cc: Palmer Dabbelt --- arch/riscv/kernel/process.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/arch/riscv/kernel/process.c b/arch/riscv/kernel/process.c index 03ac3aa611f5..8c7665481a9f 100644 --- a/arch/riscv/kernel/process.c +++ b/arch/riscv/kernel/process.c @@ -97,6 +97,15 @@ void start_thread(struct pt_regs *regs, unsigned long pc, } regs->epc = pc; regs->sp = sp; + +#ifdef CONFIG_64BIT + regs->status &= ~SR_UXL; + + if (is_compat_task()) + regs->status |= SR_UXL_32; + else + regs->status |= SR_UXL_64; +#endif } void flush_thread(void)