From patchwork Sun Feb 27 16:28:31 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Guo Ren X-Patchwork-Id: 12762018 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 6070FC433F5 for ; Sun, 27 Feb 2022 16:47:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=0x+FnVPjKeSSTfr8lEEOPqEvh+7K2wq5AAHFGVlQtm4=; b=l60VVEucJzsinn i/Fzebba0M7HeiGVBuLa9vQzC/9oTXEtw8lf233R2zRxJ8T5e3C5ePFNm8r9CK+qhXOIsE4AmVYVd Z00nN1HUha7OiUU85sJkyvu/mbSNv9tFkKgpCvlEHIqLja1nRucZWwKTYvj216jolDTyJ3V+VscmU JDECZgRlfdJ93snr7MS+LbbeJTV7rQg+748hu9x/tHmLpuL3mb6UU/2RCKRzFFj9WnHiMzQgD6+hd SgDKtuRKvyhkbjBfTzXXKZuagQ9aHzXc41KMrzcK7iDxaQqbq2jzg6LIJ9mp8+OjL0kKpEjfuIhqA QY7HmLNPEdEOi9TMs45A==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1nOMgL-009nc2-0J; Sun, 27 Feb 2022 16:46:02 +0000 Received: from dfw.source.kernel.org ([139.178.84.217]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1nOMRd-009gYT-7W; Sun, 27 Feb 2022 16:30:51 +0000 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 4771360FB3; Sun, 27 Feb 2022 16:30:48 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3CBC8C36AE5; Sun, 27 Feb 2022 16:30:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1645979448; bh=IJ7jR8mTvejG9VzZtr4+z5Hdjv3FHdsfGnEFZTtHWjA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=cR2wJgH+zoufDToYTUD+1USCs3uBgNk9Vu5T/Jsv51PXurzHTdpo3qnl8FCqqq4SZ pxVQ2A1oxJ2m5w4iZMJZdpAKiO7v9Aw6y9tSE7kOacf12sqBfPioXBNC3v5tqXutH6 V9oUL7mVEGNWbnKcAmKuL0q4g+VEejgLSprNwt+UqS5uKkihBHV88+BdalOH/2FILn DkJOF4RC5wwmNFWdQLkrh7D1P53c1Z4POdkI8rTcnZrzSrl4RQbQSVWTEgUVOjfYYF sd968+cQYROL61p0e7fyzZfbX3EY3CVXdW+9olIzZAyNfN8t/OvLH85pp3cre7Rrav 8RZusExHrrs4w== 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 20/20] riscv: compat: Add COMPAT Kbuild skeletal support Date: Mon, 28 Feb 2022 00:28:31 +0800 Message-Id: <20220227162831.674483-21-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 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220227_083049_541731_A2D31EA2 X-CRM114-Status: GOOD ( 10.15 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org From: Guo Ren Adds initial skeletal COMPAT Kbuild (Running 32bit U-mode on 64bit S-mode) support. - Setup kconfig & dummy functions for compiling. - Implement compat_start_thread by the way. Signed-off-by: Guo Ren Signed-off-by: Guo Ren Reviewed-by: Arnd Bergmann Cc: Palmer Dabbelt --- arch/riscv/Kconfig | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index 5adcbd9b5e88..6f11df8c189f 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -73,6 +73,7 @@ config RISCV select HAVE_ARCH_KGDB if !XIP_KERNEL select HAVE_ARCH_KGDB_QXFER_PKT select HAVE_ARCH_MMAP_RND_BITS if MMU + select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT select HAVE_ARCH_SECCOMP_FILTER select HAVE_ARCH_TRACEHOOK select HAVE_ARCH_TRANSPARENT_HUGEPAGE if 64BIT && MMU @@ -123,12 +124,18 @@ config ARCH_MMAP_RND_BITS_MIN default 18 if 64BIT default 8 +config ARCH_MMAP_RND_COMPAT_BITS_MIN + default 8 + # max bits determined by the following formula: # VA_BITS - PAGE_SHIFT - 3 config ARCH_MMAP_RND_BITS_MAX default 24 if 64BIT # SV39 based default 17 +config ARCH_MMAP_RND_COMPAT_BITS_MAX + default 17 + # set if we run in machine mode, cleared if we run in supervisor mode config RISCV_M_MODE bool @@ -406,6 +413,18 @@ config CRASH_DUMP For more details see Documentation/admin-guide/kdump/kdump.rst +config COMPAT + bool "Kernel support for 32-bit U-mode" + default 64BIT + depends on 64BIT && MMU + help + This option enables support for a 32-bit U-mode running under a 64-bit + kernel at S-mode. riscv32-specific components such as system calls, + the user helper functions (vdso), signal rt_frame functions and the + ptrace interface are handled appropriately by the kernel. + + If you want to execute 32-bit userspace applications, say Y. + endmenu menu "Boot options"