From patchwork Tue Jun 6 14:56:04 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jamie Cunliffe X-Patchwork-Id: 13269335 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 0DE68C77B7A for ; Tue, 6 Jun 2023 14:58:08 +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=FllxDGM0KIZaOn4ObnRHt/gDJxS+4o11cYpE3s/c4Mk=; b=4UBrmZ8bukd4w+ jenYyHeHAUe2TgrSUPsM+XDwLroid5Lpu2Wwp6FJRwNMcJSAX2wqBEPVrp4WN3E8y3vaCEnr33U/E d9Oobub2koL28BEmmOYbwPE3gsg9irfZ6c9rQX/dLtuJ6oG0eGf/c82u1RNMrm4VNjTRTe8uxZs1E SAUegcOTwdJrns/UTiJ17tAsJ1KlnrLvisuZ4914Z7/OXDXjallnxPLTaguKYVt623ImelYG1izxm pRTmKWgagP89gbs9raupiyoT+DCXQTENKOoesClNyW4E4Cn5nhCGIDUTMAdthkZTWJKaQZ22uCSdC +zDm2hwkzoKJ5Z+nHUXA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1q6Y7y-00281t-20; Tue, 06 Jun 2023 14:57:42 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1q6Y7u-002802-35 for linux-arm-kernel@lists.infradead.org; Tue, 06 Jun 2023 14:57:41 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id F20A52F4; Tue, 6 Jun 2023 07:58:19 -0700 (PDT) Received: from capper-ampere.manchester.arm.com (capper-ampere.manchester.arm.com [10.32.100.23]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 667863F6C4; Tue, 6 Jun 2023 07:57:33 -0700 (PDT) From: Jamie Cunliffe To: linux-arm-kernel@lists.infradead.org, rust-for-linux@vger.kernel.org Cc: Miguel Ojeda , Catalin Marinas , Will Deacon , steve.capper@arm.com, Asahi Lina Subject: [PATCH v2 1/3] arm64: rust: Enable Rust support for AArch64 Date: Tue, 6 Jun 2023 15:56:04 +0100 Message-Id: <20230606145606.1153715-2-Jamie.Cunliffe@arm.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20230606145606.1153715-1-Jamie.Cunliffe@arm.com> References: <20230606145606.1153715-1-Jamie.Cunliffe@arm.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230606_075739_087895_390E35FC X-CRM114-Status: GOOD ( 14.84 ) 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 This commit provides the build flags for Rust for AArch64. The core Rust support already in the kernel does the rest. When disabling the neon and fp target features to avoid fp & simd registers. The use of fp-armv8 will cause a warning from rustc about an unknown feature that is specified. The target feature is still passed through to LLVM, this behaviour is documented as part of the warning. This will be fixed in a future version of the rustc toolchain. The Rust samples have been tested with this commit. Signed-off-by: Jamie Cunliffe --- Documentation/rust/arch-support.rst | 1 + Makefile | 1 - arch/arm64/Kconfig | 1 + arch/arm64/Makefile | 2 ++ arch/x86/Makefile | 1 + rust/Makefile | 6 +++++- scripts/Makefile | 5 +++-- scripts/generate_rust_target.rs | 4 +++- 8 files changed, 16 insertions(+), 5 deletions(-) diff --git a/Documentation/rust/arch-support.rst b/Documentation/rust/arch-support.rst index b91e9ef4d0c2..9b022af2f649 100644 --- a/Documentation/rust/arch-support.rst +++ b/Documentation/rust/arch-support.rst @@ -15,6 +15,7 @@ support corresponds to ``S`` values in the ``MAINTAINERS`` file. ============ ================ ============================================== Architecture Level of support Constraints ============ ================ ============================================== +``arm64`` Maintained None. ``um`` Maintained ``x86_64`` only. ``x86`` Maintained ``x86_64`` only. ============ ================ ============================================== diff --git a/Makefile b/Makefile index 9d765ebcccf1..16b1e4de70e3 100644 --- a/Makefile +++ b/Makefile @@ -561,7 +561,6 @@ KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \ -std=gnu11 KBUILD_CPPFLAGS := -D__KERNEL__ KBUILD_RUSTFLAGS := $(rust_common_flags) \ - --target=$(objtree)/scripts/target.json \ -Cpanic=abort -Cembed-bitcode=n -Clto=n \ -Cforce-unwind-tables=n -Ccodegen-units=1 \ -Csymbol-mangling-version=v0 \ diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index b1201d25a8a4..10e9399e8e2f 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -217,6 +217,7 @@ config ARM64 select HAVE_FUNCTION_ARG_ACCESS_API select MMU_GATHER_RCU_TABLE_FREE select HAVE_RSEQ + select HAVE_RUST select HAVE_STACKPROTECTOR select HAVE_SYSCALL_TRACEPOINTS select HAVE_KPROBES diff --git a/arch/arm64/Makefile b/arch/arm64/Makefile index 2d49aea0ff67..2ce1555e9fc5 100644 --- a/arch/arm64/Makefile +++ b/arch/arm64/Makefile @@ -41,6 +41,8 @@ KBUILD_CFLAGS += -mgeneral-regs-only \ KBUILD_CFLAGS += $(call cc-disable-warning, psabi) KBUILD_AFLAGS += $(compat_vdso) +KBUILD_RUSTFLAGS += --target aarch64-unknown-none -C target-feature="-neon,-fp-armv8" + KBUILD_CFLAGS += $(call cc-option,-mabi=lp64) KBUILD_AFLAGS += $(call cc-option,-mabi=lp64) diff --git a/arch/x86/Makefile b/arch/x86/Makefile index b39975977c03..79cffe92c916 100644 --- a/arch/x86/Makefile +++ b/arch/x86/Makefile @@ -68,6 +68,7 @@ export BITS # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53383 # KBUILD_CFLAGS += -mno-sse -mno-mmx -mno-sse2 -mno-3dnow -mno-avx +KBUILD_RUSTFLAGS += --target=$(objtree)/scripts/target.json KBUILD_RUSTFLAGS += -Ctarget-feature=-sse,-sse2,-sse3,-ssse3,-sse4.1,-sse4.2,-avx,-avx2 ifeq ($(CONFIG_X86_KERNEL_IBT),y) diff --git a/rust/Makefile b/rust/Makefile index 7c9d9f11aec5..18d6fdb73fa9 100644 --- a/rust/Makefile +++ b/rust/Makefile @@ -262,6 +262,7 @@ bindgen_skip_c_flags := -mno-fp-ret-in-387 -mpreferred-stack-boundary=% \ # Derived from `scripts/Makefile.clang`. BINDGEN_TARGET_x86 := x86_64-linux-gnu +BINDGEN_TARGET_arm64 := aarch64-linux-gnu BINDGEN_TARGET := $(BINDGEN_TARGET_$(SRCARCH)) # All warnings are inhibited since GCC builds are very experimental, @@ -393,8 +394,11 @@ $(obj)/core.o: private skip_clippy = 1 $(obj)/core.o: private skip_flags = -Dunreachable_pub $(obj)/core.o: private rustc_objcopy = $(foreach sym,$(redirect-intrinsics),--redefine-sym $(sym)=__rust$(sym)) $(obj)/core.o: private rustc_target_flags = $(core-cfgs) -$(obj)/core.o: $(RUST_LIB_SRC)/core/src/lib.rs scripts/target.json FORCE +$(obj)/core.o: $(RUST_LIB_SRC)/core/src/lib.rs FORCE $(call if_changed_dep,rustc_library) +ifeq ($(ARCH),x86_64) +$(obj)/core.o: scripts/target.json +endif $(obj)/compiler_builtins.o: private rustc_objcopy = -w -W '__*' $(obj)/compiler_builtins.o: $(src)/compiler_builtins.rs $(obj)/core.o FORCE diff --git a/scripts/Makefile b/scripts/Makefile index 32b6ba722728..633479d02e33 100644 --- a/scripts/Makefile +++ b/scripts/Makefile @@ -9,12 +9,13 @@ hostprogs-always-$(CONFIG_BUILDTIME_TABLE_SORT) += sorttable hostprogs-always-$(CONFIG_ASN1) += asn1_compiler hostprogs-always-$(CONFIG_MODULE_SIG_FORMAT) += sign-file hostprogs-always-$(CONFIG_SYSTEM_EXTRA_CERTIFICATE) += insert-sys-cert -always-$(CONFIG_RUST) += target.json +ifeq ($(ARCH),x86_64) +always-$(CONFIG_RUST) += target.json filechk_rust_target = $< < include/config/auto.conf - $(obj)/target.json: scripts/generate_rust_target include/config/auto.conf FORCE $(call filechk,rust_target) +endif hostprogs += generate_rust_target generate_rust_target-rust := y diff --git a/scripts/generate_rust_target.rs b/scripts/generate_rust_target.rs index 3c6cbe2b278d..ec5ef35dbe52 100644 --- a/scripts/generate_rust_target.rs +++ b/scripts/generate_rust_target.rs @@ -148,7 +148,9 @@ fn main() { let mut ts = TargetSpec::new(); // `llvm-target`s are taken from `scripts/Makefile.clang`. - if cfg.has("X86_64") { + if cfg.has("ARM64") { + panic!("arm64 uses the builtin rustc aarch64-unknown-none target"); + } else if cfg.has("X86_64") { ts.push("arch", "x86_64"); ts.push( "data-layout",