From patchwork Mon Oct 28 12:10:42 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 11215231 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id E9196112B for ; Mon, 28 Oct 2019 12:11:20 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id BF1D7214D9 for ; Mon, 28 Oct 2019 12:11:20 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="qEm2GbCZ" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org BF1D7214D9 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-riscv-bounces+patchwork-linux-riscv=patchwork.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=u3GQRJgtoBSbMhrGa9Wr95pvAsFASdGAd2ucw471ABY=; b=qEm2GbCZBRd9oP LsjEWuxpD3V5yhI9Ey123wZMzsPu0W1tvrne/DqP+Ya91TUv6+D7rDALKMaDpg9GYrYh+c2VkpXsF QuM3amgTeKw/bLYjOF+WzDowUavqi7n3xVa5Ucm7Kx5A5hc8Xk6Qf/gyLaudc1JTf7bAhicubSQhT tbzDJ9gFM6SbjBmtc06YHh5krQ8EqxHZMWLmvkqMPTYl0ZNb/HdwJjYBKj8HoDMPrpcgtXYAOPGkW bWO/gwnoXd325pPFR0yxP2suzjPOcLf7GKnYZ7zwbnJirKQv+Z5YNHZY3jivHdA5zeziaj85P3J+3 CLD20xHLo2HwnQ+HqFAQ==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1iP3rj-0007QB-Oe; Mon, 28 Oct 2019 12:11:19 +0000 Received: from [2001:4bb8:18c:c7d:c70:4a89:bc61:2] (helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1iP3rh-0007LO-Pt; Mon, 28 Oct 2019 12:11:18 +0000 From: Christoph Hellwig To: Palmer Dabbelt , Paul Walmsley Subject: [PATCH 11/12] riscv: provide a flat image loader Date: Mon, 28 Oct 2019 13:10:42 +0100 Message-Id: <20191028121043.22934-12-hch@lst.de> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20191028121043.22934-1-hch@lst.de> References: <20191028121043.22934-1-hch@lst.de> MIME-Version: 1.0 X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Anup Patel , Damien Le Moal , linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org Sender: "linux-riscv" Errors-To: linux-riscv-bounces+patchwork-linux-riscv=patchwork.kernel.org@lists.infradead.org This allows just loading the kernel at a pre-set address without qemu going bonkers trying to map the ELF file. Contains a controbution from Aurabindo Jayamohanan to reuse the PAGE_OFFSET definition. Signed-off-by: Christoph Hellwig Reviewed-by: Anup Patel --- arch/riscv/Makefile | 13 +++++++++---- arch/riscv/boot/Makefile | 7 ++++++- arch/riscv/boot/loader.S | 8 ++++++++ arch/riscv/boot/loader.lds.S | 16 ++++++++++++++++ 4 files changed, 39 insertions(+), 5 deletions(-) create mode 100644 arch/riscv/boot/loader.S create mode 100644 arch/riscv/boot/loader.lds.S diff --git a/arch/riscv/Makefile b/arch/riscv/Makefile index f5e914210245..b9009a2fbaf5 100644 --- a/arch/riscv/Makefile +++ b/arch/riscv/Makefile @@ -83,13 +83,18 @@ PHONY += vdso_install vdso_install: $(Q)$(MAKE) $(build)=arch/riscv/kernel/vdso $@ -all: Image.gz +ifeq ($(CONFIG_RISCV_M_MODE),y) +KBUILD_IMAGE := $(boot)/loader +else +KBUILD_IMAGE := $(boot)/Image.gz +endif +BOOT_TARGETS := Image Image.gz loader -Image: vmlinux - $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@ +all: $(notdir $(KBUILD_IMAGE)) -Image.%: Image +$(BOOT_TARGETS): vmlinux $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@ + @$(kecho) ' Kernel: $(boot)/$@ is ready' zinstall install: $(Q)$(MAKE) $(build)=$(boot) $@ diff --git a/arch/riscv/boot/Makefile b/arch/riscv/boot/Makefile index 0990a9fdbe5d..433ccbcabb23 100644 --- a/arch/riscv/boot/Makefile +++ b/arch/riscv/boot/Makefile @@ -16,7 +16,7 @@ OBJCOPYFLAGS_Image :=-O binary -R .note -R .note.gnu.build-id -R .comment -S -targets := Image +targets := Image loader $(obj)/Image: vmlinux FORCE $(call if_changed,objcopy) @@ -24,6 +24,11 @@ $(obj)/Image: vmlinux FORCE $(obj)/Image.gz: $(obj)/Image FORCE $(call if_changed,gzip) +loader.o: $(src)/loader.S $(obj)/Image + +$(obj)/loader: $(obj)/loader.o $(obj)/Image $(obj)/loader.lds FORCE + $(Q)$(LD) -T $(obj)/loader.lds -o $@ $(obj)/loader.o + install: $(CONFIG_SHELL) $(srctree)/$(src)/install.sh $(KERNELRELEASE) \ $(obj)/Image System.map "$(INSTALL_PATH)" diff --git a/arch/riscv/boot/loader.S b/arch/riscv/boot/loader.S new file mode 100644 index 000000000000..5586e2610dbb --- /dev/null +++ b/arch/riscv/boot/loader.S @@ -0,0 +1,8 @@ +// SPDX-License-Identifier: GPL-2.0 + + .align 4 + .section .payload, "ax", %progbits + .globl _start +_start: + .incbin "arch/riscv/boot/Image" + diff --git a/arch/riscv/boot/loader.lds.S b/arch/riscv/boot/loader.lds.S new file mode 100644 index 000000000000..47a5003c2e28 --- /dev/null +++ b/arch/riscv/boot/loader.lds.S @@ -0,0 +1,16 @@ +/* SPDX-License-Identifier: GPL-2.0 */ + +#include + +OUTPUT_ARCH(riscv) +ENTRY(_start) + +SECTIONS +{ + . = PAGE_OFFSET; + + .payload : { + *(.payload) + . = ALIGN(8); + } +}