From patchwork Fri Feb 24 13:36:10 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Conor Dooley X-Patchwork-Id: 13151265 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 A3020C61DA4 for ; Fri, 24 Feb 2023 13:37:39 +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=c+6YNRe16AiLTW2WoiW7v7eMONz+R+0yQInL8za7s9g=; b=rkG0RQsDRI9XPq +kWUua3HkmSFRH9qbtASxv8ery27w3xcU1cnpqYRVFuTVhHYLS8lvSX8VZ5QxUxntsYIKsxDhaBrq FP6N9mHUtuCMGcCVg7leuhKTszV55Li8RUrtNKnJEGNTeQaeYl/KMK369P25+a6f3JqVpUOVAn72+ vhVQ8AYbufoV9740cKd+gymr2sYtcq0YQyffXhtw7BgqczEmAQ4sPx06iV6W4W7Fjr+tZY/siuo38 aB8q0vL6bYcmFicnea5lmXWmkEuEzKJo2Sj9mRlLwsRcfOy5azYoI3YLpmmr7HEo5jCm0wgAHMVBy xZ8GcMyUuplR77hsniQQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1pVYGQ-002dDt-O2; Fri, 24 Feb 2023 13:37:30 +0000 Received: from esa.microchip.iphmx.com ([68.232.153.233]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1pVYGM-002dCN-Nj for linux-riscv@lists.infradead.org; Fri, 24 Feb 2023 13:37:28 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=microchip.com; i=@microchip.com; q=dns/txt; s=mchp; t=1677245847; x=1708781847; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=Zxyy6A23kw6IrlgYDJt5MU6IfP1fNW8NpMWRI27Z4YI=; b=oJkcZNwn/+bbLmyvtemdU7PFKXY9YpAB+eee40idvXUIAQ/DwuyYFsj4 sxJXmjlvg1R9JEJUhVI0c7h6EFEUwcu24Gc9LFZ7tTk1d/Uro0XLBMIJl 84jhg1HheLQ0xjb+LmVxYUjqdjgTiYk1XnRDd8uhW2LHveYyda4N2CY1+ ricrHoOogKse7/33XPL7VbntjIhZ5U3Bk+sv90oZi7iumSMWTb53Q6QiC UZDp3lA6F04BG7YIAo597FmH1Bd+pC4g7DCuryzKD7ONxO+K6bSAwo4Zh 7Xdq06wTtFQt4t/gQs443KR7QpADBgmd9eN5P0pH31L5jslEA72g4t0/Z g==; X-IronPort-AV: E=Sophos;i="5.97,324,1669100400"; d="scan'208";a="202424687" Received: from unknown (HELO email.microchip.com) ([170.129.1.10]) by esa5.microchip.iphmx.com with ESMTP/TLS/AES256-SHA256; 24 Feb 2023 06:37:23 -0700 Received: from chn-vm-ex02.mchp-main.com (10.10.85.144) by chn-vm-ex01.mchp-main.com (10.10.85.143) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.16; Fri, 24 Feb 2023 06:37:22 -0700 Received: from wendy.microchip.com (10.10.115.15) by chn-vm-ex02.mchp-main.com (10.10.85.144) with Microsoft SMTP Server id 15.1.2507.16 via Frontend Transport; Fri, 24 Feb 2023 06:37:21 -0700 From: Conor Dooley To: CC: Miguel Ojeda , , Conor Dooley Subject: [RFC 2/2] RISC-V: enable building the 64-bit kernels with rust support Date: Fri, 24 Feb 2023 13:36:10 +0000 Message-ID: <20230224133609.2877396-3-conor.dooley@microchip.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230224133609.2877396-1-conor.dooley@microchip.com> References: <20230224133609.2877396-1-conor.dooley@microchip.com> MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=2348; i=conor.dooley@microchip.com; h=from:subject; bh=aaMnOWRcKygLDf2dZAPyBV3QPo/ZEMMt7m1TdDcBtFs=; b=owGbwMvMwCFWscWwfUFT0iXG02pJDMk/9rrOEpLPe6KkszyUS712Y8XHqcdrI9QORtuon8s+m3Jh 7YGojlIWBjEOBlkxRZbE230tUuv/uOxw7nkLM4eVCWQIAxenAExkTRXD/7yPq97J5pfbKerH1jh1+V i6xhtKld6+1VVvzcb+S0LzJMM/Kym747N9EktYPpQwF3paq2xacz/9fIWHjZYGu56fwxR+AA== X-Developer-Key: i=conor.dooley@microchip.com; a=openpgp; fpr=F9ECA03CF54F12CD01F1655722E2C55B37CF380C X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230224_053726_871637_D47A663E X-CRM114-Status: UNSURE ( 7.71 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-riscv@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-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org From: Miguel Ojeda The rust modules work on 64-bit RISC-V, with no twiddling required. Select HAS_RUST and provide the required flags to kbuild so that the modules can be used. 32-bit is broken in core rust code, so support is limited to 64-bit only: ld.lld: error: undefined symbol: __udivdi3 Signed-off-by: Miguel Ojeda Signed-off-by: Conor Dooley --- Documentation/rust/arch-support.rst | 2 ++ arch/riscv/Kconfig | 1 + arch/riscv/Makefile | 3 ++- 3 files changed, 5 insertions(+), 1 deletion(-) diff --git a/Documentation/rust/arch-support.rst b/Documentation/rust/arch-support.rst index 6982b63775da..197919158596 100644 --- a/Documentation/rust/arch-support.rst +++ b/Documentation/rust/arch-support.rst @@ -15,5 +15,7 @@ support corresponds to ``S`` values in the ``MAINTAINERS`` file. ============ ================ ============================================== Architecture Level of support Constraints ============ ================ ============================================== +``riscv`` Maintained ``rv64`` only. +============ ================ ============================================== ``x86`` Maintained ``x86_64`` only. ============ ================ ============================================== diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index 81eb031887d2..73174157212d 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -115,6 +115,7 @@ config RISCV select HAVE_POSIX_CPU_TIMERS_TASK_WORK select HAVE_REGS_AND_STACK_ACCESS_API select HAVE_RSEQ + select HAVE_RUST if 64BIT select HAVE_STACKPROTECTOR select HAVE_SYSCALL_TRACEPOINTS select IRQ_DOMAIN diff --git a/arch/riscv/Makefile b/arch/riscv/Makefile index 76989561566b..f8b3f58f2e40 100644 --- a/arch/riscv/Makefile +++ b/arch/riscv/Makefile @@ -29,7 +29,7 @@ ifeq ($(CONFIG_ARCH_RV64I),y) KBUILD_CFLAGS += -mabi=lp64 KBUILD_AFLAGS += -mabi=lp64 - + KBUILD_RUSTFLAGS += -Ctarget-cpu=generic-rv64 KBUILD_LDFLAGS += -melf64lriscv else BITS := 32 @@ -38,6 +38,7 @@ else KBUILD_CFLAGS += -mabi=ilp32 KBUILD_AFLAGS += -mabi=ilp32 KBUILD_LDFLAGS += -melf32lriscv + KBUILD_RUSTFLAGS += -Ctarget-cpu=generic-rv32 endif ifeq ($(CONFIG_LD_IS_LLD),y)