From patchwork Tue Mar 22 14:40:03 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Guo Ren X-Patchwork-Id: 12788681 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 1FB3EC433EF for ; Tue, 22 Mar 2022 14:59:15 +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=FGo4pqwlNAEE6Cc7+sN0bu6zGemsHIhrzLhAH03MVvE=; b=SxfQVcfsilVBlL +ZRFqaFlWc3WwoXf5B/GBS6B7H0uQaXXGr8poAp81D1FoNdOlEm/B8RKH0Ruc359fcf+rUFPbX5yB YBi9V12ioCRcl2N4o0fxNWrycIt/z/KTi1K+RfQeVaGHz8pl2XM4tgKe+TZ8ED2O1Yxqlu/6C/yBi 4Ij3kFf/p/0BUeAewG/npLZVt7dUX0RVKYyrnRS9xWsCQB5JJHadQ5wMa7h/+XR36SnvS0au6ECK2 02klJGWRLq5KFDAMd+jHD0FHEv3J9ymHmqIaUZh2C3fECwzgsanZogyM0Gi1cN90VwSm9j2QzlnDT REUf96IlpEyW48HV/IEA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1nWfxF-00BPqy-1h; Tue, 22 Mar 2022 14:57:49 +0000 Received: from dfw.source.kernel.org ([2604:1380:4641:c500::1]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1nWfiJ-00BHug-Sj; Tue, 22 Mar 2022 14:42:25 +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 5F650616D0; Tue, 22 Mar 2022 14:42:23 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id E29A4C36AE2; Tue, 22 Mar 2022 14:42:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1647960143; bh=qyoPYJlSA6NEig6jnwlt/QYfSWiYQ9maXb6WEkmPDVA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=OfR6sAJka8wfUUiM43qGreLVN5SPIpmmMPa66UNRB2ZiKpNvdeF61xiBk2WKBEIR2 hLgcIe9UOXgyQsz7Aywb54SIphKL7HXbUMYmXNflLuU4IteYo2TDiRQT4nzR0KyFGp 8W+rr+gxr/Qr3D4fk4bqZ+zkcCwtdK0iRxo9IHlMw4MeRSpRafyDMMAzy5brqIRvpO +3M6wL/0MLp9ikO/2uFX7sA6UIj8lavazZHBe0dJI3uTlVLv5YxnITVnLb/XK6WDKt QsksuB3qJ9qf9OTr4iigCk8pYmZRsfjYl7xPamOLY9kiRhUZjLz3nmF4PYb9rSY1pM QPEp+dv60eKkQ== 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 V9 20/20] riscv: compat: Add COMPAT Kbuild skeletal support Date: Tue, 22 Mar 2022 22:40:03 +0800 Message-Id: <20220322144003.2357128-21-guoren@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220322144003.2357128-1-guoren@kernel.org> References: <20220322144003.2357128-1-guoren@kernel.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220322_074224_084354_3EF86578 X-CRM114-Status: GOOD ( 10.98 ) 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 Tested-by: Heiko Stuebner 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"