From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.9 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 45C7CC433E3 for ; Tue, 25 Aug 2020 19:10:40 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 23B062074D for ; Tue, 25 Aug 2020 19:10:40 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=atishpatra.org header.i=@atishpatra.org header.b="fmc8iYS3" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726707AbgHYTKj (ORCPT ); Tue, 25 Aug 2020 15:10:39 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49140 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726149AbgHYTKg (ORCPT ); Tue, 25 Aug 2020 15:10:36 -0400 Received: from mail-wm1-x343.google.com (mail-wm1-x343.google.com [IPv6:2a00:1450:4864:20::343]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 25EA7C061574 for ; Tue, 25 Aug 2020 12:10:36 -0700 (PDT) Received: by mail-wm1-x343.google.com with SMTP id a65so47822wme.5 for ; Tue, 25 Aug 2020 12:10:36 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=atishpatra.org; s=google; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=nmEWks99ETFd54v9RPVNHrlKY8LROi6ivK+zqVS2cko=; b=fmc8iYS3OkqBCAvDD8X3kJyL5xoMm4ZiFXA3VdYSL05/x/4+GdgkoniKDVTAC4laLK cBmuJiQmBptd2uqEsuiLyuNFoJXpTbYygwYkmI+D+9VZya+83v95nbGkIMUGMWGGP0P1 I4N7HLQ80AFg0hPoU/rXiAEiTQM32KW/x/d2A= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=nmEWks99ETFd54v9RPVNHrlKY8LROi6ivK+zqVS2cko=; b=cymzEyMIIefsG+vwN7qLRgW7i2AMjgvTVSKKVbk9yMKEublfj2g62DV6nbfHX7ksjr pNhAtSQ4Msd5xwKa7QYzhpTPQ9VJW7OlQFvu7Xjxl92MgELOVzYPVVXW3SKQ/3eZKmbT Kt/jxnSDM0D3ra2nMl9qKzeY5nutM8WzZ86tr7crVeIy/b7AisVaNT/hL17XtbcDs2nf Zaz8W6YPdju/SysnnBOdtl96eT8vUrlMckev9yOOf0xcNKK44rk1sXEOo8fmld8fcYLP Hd4txbr0CIuOmkz3dsfvGMVrjemqk6X0wwlQxfd1mrXhoL9DujxUZsDsV5GpTfxPrFfl iOrQ== X-Gm-Message-State: AOAM5300BB/Xq7HbNnBTNdgxO4Bpw5iPMuMYcQ3dpPljMZh2oaNSSqO5 15Dr8+Uq6Dte9r8/0zHKopeHvO+5mn5CpIecLdeG X-Google-Smtp-Source: ABdhPJwZTiHNBYD+IoxhDqh+/hKZWO/N0qn6URd4qFE+vGCLZWHQtTjkhbuC7MODKF/4gJX9/euGekeQnD+Y9t21jXw= X-Received: by 2002:a05:600c:230f:: with SMTP id 15mr3356730wmo.186.1598382634644; Tue, 25 Aug 2020 12:10:34 -0700 (PDT) MIME-Version: 1.0 References: <20200819222425.30721-6-atish.patra@wdc.com> In-Reply-To: From: Atish Patra Date: Tue, 25 Aug 2020 12:10:23 -0700 Message-ID: Subject: Re: [PATCH v6 5/9] RISC-V: Add PE/COFF header for EFI stub To: Palmer Dabbelt Cc: Atish Patra , "linux-kernel@vger.kernel.org List" , Ard Biesheuvel , Anup Patel , Alistair Francis , Anup Patel , Arvind Sankar , Damien Le Moal , Greentime Hu , hca@linux.ibm.com, Ingo Molnar , Kees Cook , linux-efi , linux-riscv , Masahiro Yamada , Michal Simek , Mike Rapoport , Nick Desaulniers , Paul Walmsley , Steven Price , Waiman Long , Zong Li , "Schaefer, Daniel (DualStudy)" , Abner Chang Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Aug 25, 2020 at 11:04 AM Palmer Dabbelt wrote: > > On Wed, 19 Aug 2020 15:24:21 PDT (-0700), Atish Patra wrote: > > Linux kernel Image can appear as an EFI application With appropriate > > PE/COFF header fields in the beginning of the Image header. An EFI > > application loader can directly load a Linux kernel Image and an EFI > > stub residing in kernel can boot Linux kernel directly. > > > > Add the necessary PE/COFF header. > > > > Signed-off-by: Atish Patra > > Link: https://lore.kernel.org/r/20200421033336.9663-3-atish.patra@wdc.com > > [ardb: - use C prefix for c.li to ensure the expected opcode is emitted > > - align all image sections according to PE/COFF section alignment ] > > Signed-off-by: Ard Biesheuvel > > Reviewed-by: Anup Patel > > --- > > arch/riscv/include/asm/sections.h | 13 ++++ > > arch/riscv/kernel/Makefile | 4 ++ > > arch/riscv/kernel/efi-header.S | 104 ++++++++++++++++++++++++++++++ > > arch/riscv/kernel/head.S | 16 +++++ > > arch/riscv/kernel/image-vars.h | 51 +++++++++++++++ > > arch/riscv/kernel/vmlinux.lds.S | 22 ++++++- > > 6 files changed, 208 insertions(+), 2 deletions(-) > > create mode 100644 arch/riscv/include/asm/sections.h > > create mode 100644 arch/riscv/kernel/efi-header.S > > create mode 100644 arch/riscv/kernel/image-vars.h > > > > diff --git a/arch/riscv/include/asm/sections.h b/arch/riscv/include/asm/sections.h > > new file mode 100644 > > index 000000000000..3a9971b1210f > > --- /dev/null > > +++ b/arch/riscv/include/asm/sections.h > > @@ -0,0 +1,13 @@ > > +/* SPDX-License-Identifier: GPL-2.0-only */ > > +/* > > + * Copyright (C) 2020 Western Digital Corporation or its affiliates. > > + */ > > +#ifndef __ASM_SECTIONS_H > > +#define __ASM_SECTIONS_H > > + > > +#include > > + > > +extern char _start[]; > > +extern char _start_kernel[]; > > + > > +#endif /* __ASM_SECTIONS_H */ > > diff --git a/arch/riscv/kernel/Makefile b/arch/riscv/kernel/Makefile > > index a5287ab9f7f2..eabec4dce50b 100644 > > --- a/arch/riscv/kernel/Makefile > > +++ b/arch/riscv/kernel/Makefile > > @@ -32,6 +32,10 @@ obj-y += patch.o > > obj-$(CONFIG_MMU) += vdso.o vdso/ > > > > obj-$(CONFIG_RISCV_M_MODE) += clint.o traps_misaligned.o > > +OBJCOPYFLAGS := --prefix-symbols=__efistub_ > > +$(obj)/%.stub.o: $(obj)/%.o FORCE > > + $(call if_changed,objcopy) > > + > > Is there a reason this is below those objects? Nope. I don't really care, but it > triggered a merge conflict and it seems cleaner above so I put it up there. > Sure. Thanks. > > obj-$(CONFIG_FPU) += fpu.o > > obj-$(CONFIG_SMP) += smpboot.o > > obj-$(CONFIG_SMP) += smp.o > > diff --git a/arch/riscv/kernel/efi-header.S b/arch/riscv/kernel/efi-header.S > > new file mode 100644 > > index 000000000000..822b4c9ff2bb > > --- /dev/null > > +++ b/arch/riscv/kernel/efi-header.S > > @@ -0,0 +1,104 @@ > > +/* SPDX-License-Identifier: GPL-2.0-only */ > > +/* > > + * Copyright (C) 2020 Western Digital Corporation or its affiliates. > > + * Adapted from arch/arm64/kernel/efi-header.S > > + */ > > + > > +#include > > +#include > > + > > + .macro __EFI_PE_HEADER > > + .long PE_MAGIC > > +coff_header: > > +#ifdef CONFIG_64BIT > > + .short IMAGE_FILE_MACHINE_RISCV64 // Machine > > +#else > > + .short IMAGE_FILE_MACHINE_RISCV32 // Machine > > +#endif > > + .short section_count // NumberOfSections > > + .long 0 // TimeDateStamp > > + .long 0 // PointerToSymbolTable > > + .long 0 // NumberOfSymbols > > + .short section_table - optional_header // SizeOfOptionalHeader > > + .short IMAGE_FILE_DEBUG_STRIPPED | \ > > + IMAGE_FILE_EXECUTABLE_IMAGE | \ > > + IMAGE_FILE_LINE_NUMS_STRIPPED // Characteristics > > + > > +optional_header: > > + .short PE_OPT_MAGIC_PE32PLUS // PE32+ format > > + .byte 0x02 // MajorLinkerVersion > > + .byte 0x14 // MinorLinkerVersion > > + .long __pecoff_text_end - efi_header_end // SizeOfCode > > + .long __pecoff_data_virt_size // SizeOfInitializedData > > + .long 0 // SizeOfUninitializedData > > + .long __efistub_efi_pe_entry - _start // AddressOfEntryPoint > > + .long efi_header_end - _start // BaseOfCode > > + > > +extra_header_fields: > > + .quad 0 // ImageBase > > + .long PECOFF_SECTION_ALIGNMENT // SectionAlignment > > + .long PECOFF_FILE_ALIGNMENT // FileAlignment > > + .short 0 // MajorOperatingSystemVersion > > + .short 0 // MinorOperatingSystemVersion > > + .short LINUX_EFISTUB_MAJOR_VERSION // MajorImageVersion > > + .short LINUX_EFISTUB_MINOR_VERSION // MinorImageVersion > > + .short 0 // MajorSubsystemVersion > > + .short 0 // MinorSubsystemVersion > > + .long 0 // Win32VersionValue > > + > > + .long _end - _start // SizeOfImage > > + > > + // Everything before the kernel image is considered part of the header > > + .long efi_header_end - _start // SizeOfHeaders > > + .long 0 // CheckSum > > + .short IMAGE_SUBSYSTEM_EFI_APPLICATION // Subsystem > > + .short 0 // DllCharacteristics > > + .quad 0 // SizeOfStackReserve > > + .quad 0 // SizeOfStackCommit > > + .quad 0 // SizeOfHeapReserve > > + .quad 0 // SizeOfHeapCommit > > + .long 0 // LoaderFlags > > + .long (section_table - .) / 8 // NumberOfRvaAndSizes > > + > > + .quad 0 // ExportTable > > + .quad 0 // ImportTable > > + .quad 0 // ResourceTable > > + .quad 0 // ExceptionTable > > + .quad 0 // CertificationTable > > + .quad 0 // BaseRelocationTable > > + > > + // Section table > > +section_table: > > + .ascii ".text\0\0\0" > > + .long __pecoff_text_end - efi_header_end // VirtualSize > > + .long efi_header_end - _start // VirtualAddress > > + .long __pecoff_text_end - efi_header_end // SizeOfRawData > > + .long efi_header_end - _start // PointerToRawData > > + > > + .long 0 // PointerToRelocations > > + .long 0 // PointerToLineNumbers > > + .short 0 // NumberOfRelocations > > + .short 0 // NumberOfLineNumbers > > + .long IMAGE_SCN_CNT_CODE | \ > > + IMAGE_SCN_MEM_READ | \ > > + IMAGE_SCN_MEM_EXECUTE // Characteristics > > + > > + .ascii ".data\0\0\0" > > + .long __pecoff_data_virt_size // VirtualSize > > + .long __pecoff_text_end - _start // VirtualAddress > > + .long __pecoff_data_raw_size // SizeOfRawData > > + .long __pecoff_text_end - _start // PointerToRawData > > + > > + .long 0 // PointerToRelocations > > + .long 0 // PointerToLineNumbers > > + .short 0 // NumberOfRelocations > > + .short 0 // NumberOfLineNumbers > > + .long IMAGE_SCN_CNT_INITIALIZED_DATA | \ > > + IMAGE_SCN_MEM_READ | \ > > + IMAGE_SCN_MEM_WRITE // Characteristics > > + > > + .set section_count, (. - section_table) / 40 > > + > > + .balign 0x1000 > > +efi_header_end: > > + .endm > > diff --git a/arch/riscv/kernel/head.S b/arch/riscv/kernel/head.S > > index c6a37e8231a8..3631147732ee 100644 > > --- a/arch/riscv/kernel/head.S > > +++ b/arch/riscv/kernel/head.S > > @@ -13,6 +13,7 @@ > > #include > > #include > > #include > > +#include "efi-header.S" > > > > __HEAD > > ENTRY(_start) > > @@ -22,10 +23,18 @@ ENTRY(_start) > > * Do not modify it without modifying the structure and all bootloaders > > * that expects this header format!! > > */ > > +#ifdef CONFIG_EFI > > + /* > > + * This instruction decodes to "MZ" ASCII required by UEFI. > > + */ > > + c.li s4,-13 > > + j _start_kernel > > +#else > > /* jump to start kernel */ > > j _start_kernel > > /* reserved */ > > .word 0 > > +#endif > > .balign 8 > > #if __riscv_xlen == 64 > > /* Image load offset(2MB) from start of RAM */ > > @@ -43,7 +52,14 @@ ENTRY(_start) > > .ascii RISCV_IMAGE_MAGIC > > .balign 4 > > .ascii RISCV_IMAGE_MAGIC2 > > +#ifdef CONFIG_EFI > > + .word pe_head_start - _start > > +pe_head_start: > > + > > + __EFI_PE_HEADER > > +#else > > .word 0 > > +#endif > > > > .align 2 > > #ifdef CONFIG_MMU > > diff --git a/arch/riscv/kernel/image-vars.h b/arch/riscv/kernel/image-vars.h > > new file mode 100644 > > index 000000000000..8c212efb37a6 > > --- /dev/null > > +++ b/arch/riscv/kernel/image-vars.h > > @@ -0,0 +1,51 @@ > > +/* SPDX-License-Identifier: GPL-2.0-only */ > > +/* > > + * Copyright (C) 2020 Western Digital Corporation or its affiliates. > > + * Linker script variables to be set after section resolution, as > > + * ld.lld does not like variables assigned before SECTIONS is processed. > > + * Based on arch/arm64/kerne/image-vars.h > > + */ > > +#ifndef __RISCV_KERNEL_IMAGE_VARS_H > > +#define __RISCV_KERNEL_IMAGE_VARS_H > > + > > +#ifndef LINKER_SCRIPT > > +#error This file should only be included in vmlinux.lds.S > > +#endif > > + > > +#ifdef CONFIG_EFI > > + > > +/* > > + * The EFI stub has its own symbol namespace prefixed by __efistub_, to > > + * isolate it from the kernel proper. The following symbols are legally > > + * accessed by the stub, so provide some aliases to make them accessible. > > + * Only include data symbols here, or text symbols of functions that are > > + * guaranteed to be safe when executed at another offset than they were > > + * linked at. The routines below are all implemented in assembler in a > > + * position independent manner > > + */ > > +__efistub_memcmp = memcmp; > > +__efistub_memchr = memchr; > > +__efistub_memcpy = memcpy; > > +__efistub_memmove = memmove; > > +__efistub_memset = memset; > > +__efistub_strlen = strlen; > > +__efistub_strnlen = strnlen; > > +__efistub_strcmp = strcmp; > > +__efistub_strncmp = strncmp; > > +__efistub_strrchr = strrchr; > > + > > +#ifdef CONFIG_KASAN > > +__efistub___memcpy = memcpy; > > +__efistub___memmove = memmove; > > +__efistub___memset = memset; > > +#endif > > + > > +__efistub__start = _start; > > +__efistub__start_kernel = _start_kernel; > > +__efistub__end = _end; > > +__efistub__edata = _edata; > > +__efistub_screen_info = screen_info; > > + > > +#endif > > + > > +#endif /* __RISCV_KERNEL_IMAGE_VARS_H */ > > diff --git a/arch/riscv/kernel/vmlinux.lds.S b/arch/riscv/kernel/vmlinux.lds.S > > index f3586e31ed1e..6dcf790282dd 100644 > > --- a/arch/riscv/kernel/vmlinux.lds.S > > +++ b/arch/riscv/kernel/vmlinux.lds.S > > @@ -10,6 +10,7 @@ > > #include > > #include > > #include > > +#include "image-vars.h" > > > > #include > > OUTPUT_ARCH(riscv) > > @@ -17,6 +18,9 @@ ENTRY(_start) > > > > jiffies = jiffies_64; > > > > +PECOFF_SECTION_ALIGNMENT = 0x1000; > > +PECOFF_FILE_ALIGNMENT = 0x200; > > + > > SECTIONS > > { > > /* Beginning of code and text segment */ > > @@ -76,6 +80,10 @@ SECTIONS > > > > EXCEPTION_TABLE(0x10) > > > > +#ifdef CONFIG_EFI > > + . = ALIGN(PECOFF_SECTION_ALIGNMENT); > > + __pecoff_text_end = .; > > +#endif > > . = ALIGN(SECTION_ALIGN); > > _data = .; > > > > @@ -83,16 +91,26 @@ SECTIONS > > .sdata : { > > __global_pointer$ = . + 0x800; > > *(.sdata*) > > - /* End of data section */ > > - _edata = .; > > } > > > > +#ifdef CONFIG_EFI > > + .pecoff_edata_padding : { BYTE(0); . = ALIGN(PECOFF_FILE_ALIGNMENT); } > > + __pecoff_data_raw_size = ABSOLUTE(. - __pecoff_text_end); > > +#endif > > + > > + /* End of data section */ > > + _edata = .; > > + > > BSS_SECTION(PAGE_SIZE, PAGE_SIZE, 0) > > > > .rel.dyn : { > > *(.rel.dyn*) > > } > > > > +#ifdef CONFIG_EFI > > + . = ALIGN(PECOFF_SECTION_ALIGNMENT); > > + __pecoff_data_virt_size = ABSOLUTE(. - __pecoff_text_end); > > +#endif > > _end = .; > > > > STABS_DEBUG -- Regards, Atish From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-10.7 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id C7755C433E1 for ; Tue, 25 Aug 2020 19:10:48 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (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 947142074D for ; Tue, 25 Aug 2020 19:10:48 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="Z2bmkeoB"; dkim=fail reason="signature verification failed" (1024-bit key) header.d=atishpatra.org header.i=@atishpatra.org header.b="fmc8iYS3" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 947142074D Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=atishpatra.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=merlin.20170209; h=Sender:Content-Transfer-Encoding: Content-Type:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:To:Subject:Message-ID:Date:From:In-Reply-To: References:MIME-Version:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=EkMRrB1CJuhb87knXg2KkXZQ0qNIGqo8v0dFOUEq1IE=; b=Z2bmkeoBhq69PljSsoHKa2y3O ebPNn+Ue+GTIolJ/67WsNdp8pXzB2x5swplD0lbXdHEYm8cWkUrItKTN7RiVsBcGyqpqhRjXID2NC k0qsaR77jk/hXt5xJQVMBMPHCHc8JoYdiwLRAfCfAf3moHjFiKdfgvl3N/1SCezdSpRBQFLZJeYMc QE1NiaSevIn1au6CcEkhZg+1YwpGMstSPaOp2KoNfCDn9RePjVm74fGaEzUyPkio6ui2HrSqjYSGe A5nImytFUxxdfBLjiscYB67IErQ/nDWC0G2i2djSoGVDsBmnfrhoysrnTIFvtJfHBFgvJttHpSSiz D4F+wxNCQ==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1kAeLA-0004Dr-09; Tue, 25 Aug 2020 19:10:40 +0000 Received: from mail-wm1-x342.google.com ([2a00:1450:4864:20::342]) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1kAeL7-0004CW-EP for linux-riscv@lists.infradead.org; Tue, 25 Aug 2020 19:10:38 +0000 Received: by mail-wm1-x342.google.com with SMTP id x5so72802wmi.2 for ; Tue, 25 Aug 2020 12:10:35 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=atishpatra.org; s=google; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=nmEWks99ETFd54v9RPVNHrlKY8LROi6ivK+zqVS2cko=; b=fmc8iYS3OkqBCAvDD8X3kJyL5xoMm4ZiFXA3VdYSL05/x/4+GdgkoniKDVTAC4laLK cBmuJiQmBptd2uqEsuiLyuNFoJXpTbYygwYkmI+D+9VZya+83v95nbGkIMUGMWGGP0P1 I4N7HLQ80AFg0hPoU/rXiAEiTQM32KW/x/d2A= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=nmEWks99ETFd54v9RPVNHrlKY8LROi6ivK+zqVS2cko=; b=CK0MjT0ZNYu0tme/Dvumi/2bv+lyu5hmTiwS7bUpU5Ro7d40+zlQRAMQ/7b9TI/jl1 ipIiJ/vX0Sjn/Yww7/htLlLHqOLW+JUHgAXDwN4qdQzDNCrAaM+f+Am6WwIf31mOPryV r22UVC2XeJGOnC0WC4/iZPFngAfHs3pc4x+xRBKaWm6vZmmHuqx1kHAHVxZGHKQyloB5 ctHeqtEL9FSIoWLDMkcc5dvT2JRL0jBsFA9PUyxJ3LWdNTKNfMGNp3O7E5SiNpZFba8s ZMY0XK2gyPQuc1ivj0k+Q8cBbBE8DD0uyz3rBugDSimBUr5lzpb4GXpJ9bmRozkoLYma 3Sxg== X-Gm-Message-State: AOAM533f1bT1pg7bQdHIPgz58KsqYbP5u7pHWoa2/jn49ZIqj0zlGdcr YBOFXC/6oK1WPdtdpJ+cKw0QqMyri6A0mGsD1P1G X-Google-Smtp-Source: ABdhPJwZTiHNBYD+IoxhDqh+/hKZWO/N0qn6URd4qFE+vGCLZWHQtTjkhbuC7MODKF/4gJX9/euGekeQnD+Y9t21jXw= X-Received: by 2002:a05:600c:230f:: with SMTP id 15mr3356730wmo.186.1598382634644; Tue, 25 Aug 2020 12:10:34 -0700 (PDT) MIME-Version: 1.0 References: <20200819222425.30721-6-atish.patra@wdc.com> In-Reply-To: From: Atish Patra Date: Tue, 25 Aug 2020 12:10:23 -0700 Message-ID: Subject: Re: [PATCH v6 5/9] RISC-V: Add PE/COFF header for EFI stub To: Palmer Dabbelt X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200825_151037_605975_8590D90E X-CRM114-Status: GOOD ( 32.74 ) 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: linux-efi , Ard Biesheuvel , Atish Patra , Arvind Sankar , Alistair Francis , Zong Li , linux-riscv , Ingo Molnar , Anup Patel , Masahiro Yamada , Michal Simek , Steven Price , Waiman Long , Greentime Hu , "Schaefer, Daniel \(DualStudy\)" , Kees Cook , Abner Chang , hca@linux.ibm.com, Paul Walmsley , Damien Le Moal , Anup Patel , Nick Desaulniers , "linux-kernel@vger.kernel.org List" , Mike Rapoport Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org On Tue, Aug 25, 2020 at 11:04 AM Palmer Dabbelt wrote: > > On Wed, 19 Aug 2020 15:24:21 PDT (-0700), Atish Patra wrote: > > Linux kernel Image can appear as an EFI application With appropriate > > PE/COFF header fields in the beginning of the Image header. An EFI > > application loader can directly load a Linux kernel Image and an EFI > > stub residing in kernel can boot Linux kernel directly. > > > > Add the necessary PE/COFF header. > > > > Signed-off-by: Atish Patra > > Link: https://lore.kernel.org/r/20200421033336.9663-3-atish.patra@wdc.com > > [ardb: - use C prefix for c.li to ensure the expected opcode is emitted > > - align all image sections according to PE/COFF section alignment ] > > Signed-off-by: Ard Biesheuvel > > Reviewed-by: Anup Patel > > --- > > arch/riscv/include/asm/sections.h | 13 ++++ > > arch/riscv/kernel/Makefile | 4 ++ > > arch/riscv/kernel/efi-header.S | 104 ++++++++++++++++++++++++++++++ > > arch/riscv/kernel/head.S | 16 +++++ > > arch/riscv/kernel/image-vars.h | 51 +++++++++++++++ > > arch/riscv/kernel/vmlinux.lds.S | 22 ++++++- > > 6 files changed, 208 insertions(+), 2 deletions(-) > > create mode 100644 arch/riscv/include/asm/sections.h > > create mode 100644 arch/riscv/kernel/efi-header.S > > create mode 100644 arch/riscv/kernel/image-vars.h > > > > diff --git a/arch/riscv/include/asm/sections.h b/arch/riscv/include/asm/sections.h > > new file mode 100644 > > index 000000000000..3a9971b1210f > > --- /dev/null > > +++ b/arch/riscv/include/asm/sections.h > > @@ -0,0 +1,13 @@ > > +/* SPDX-License-Identifier: GPL-2.0-only */ > > +/* > > + * Copyright (C) 2020 Western Digital Corporation or its affiliates. > > + */ > > +#ifndef __ASM_SECTIONS_H > > +#define __ASM_SECTIONS_H > > + > > +#include > > + > > +extern char _start[]; > > +extern char _start_kernel[]; > > + > > +#endif /* __ASM_SECTIONS_H */ > > diff --git a/arch/riscv/kernel/Makefile b/arch/riscv/kernel/Makefile > > index a5287ab9f7f2..eabec4dce50b 100644 > > --- a/arch/riscv/kernel/Makefile > > +++ b/arch/riscv/kernel/Makefile > > @@ -32,6 +32,10 @@ obj-y += patch.o > > obj-$(CONFIG_MMU) += vdso.o vdso/ > > > > obj-$(CONFIG_RISCV_M_MODE) += clint.o traps_misaligned.o > > +OBJCOPYFLAGS := --prefix-symbols=__efistub_ > > +$(obj)/%.stub.o: $(obj)/%.o FORCE > > + $(call if_changed,objcopy) > > + > > Is there a reason this is below those objects? Nope. I don't really care, but it > triggered a merge conflict and it seems cleaner above so I put it up there. > Sure. Thanks. > > obj-$(CONFIG_FPU) += fpu.o > > obj-$(CONFIG_SMP) += smpboot.o > > obj-$(CONFIG_SMP) += smp.o > > diff --git a/arch/riscv/kernel/efi-header.S b/arch/riscv/kernel/efi-header.S > > new file mode 100644 > > index 000000000000..822b4c9ff2bb > > --- /dev/null > > +++ b/arch/riscv/kernel/efi-header.S > > @@ -0,0 +1,104 @@ > > +/* SPDX-License-Identifier: GPL-2.0-only */ > > +/* > > + * Copyright (C) 2020 Western Digital Corporation or its affiliates. > > + * Adapted from arch/arm64/kernel/efi-header.S > > + */ > > + > > +#include > > +#include > > + > > + .macro __EFI_PE_HEADER > > + .long PE_MAGIC > > +coff_header: > > +#ifdef CONFIG_64BIT > > + .short IMAGE_FILE_MACHINE_RISCV64 // Machine > > +#else > > + .short IMAGE_FILE_MACHINE_RISCV32 // Machine > > +#endif > > + .short section_count // NumberOfSections > > + .long 0 // TimeDateStamp > > + .long 0 // PointerToSymbolTable > > + .long 0 // NumberOfSymbols > > + .short section_table - optional_header // SizeOfOptionalHeader > > + .short IMAGE_FILE_DEBUG_STRIPPED | \ > > + IMAGE_FILE_EXECUTABLE_IMAGE | \ > > + IMAGE_FILE_LINE_NUMS_STRIPPED // Characteristics > > + > > +optional_header: > > + .short PE_OPT_MAGIC_PE32PLUS // PE32+ format > > + .byte 0x02 // MajorLinkerVersion > > + .byte 0x14 // MinorLinkerVersion > > + .long __pecoff_text_end - efi_header_end // SizeOfCode > > + .long __pecoff_data_virt_size // SizeOfInitializedData > > + .long 0 // SizeOfUninitializedData > > + .long __efistub_efi_pe_entry - _start // AddressOfEntryPoint > > + .long efi_header_end - _start // BaseOfCode > > + > > +extra_header_fields: > > + .quad 0 // ImageBase > > + .long PECOFF_SECTION_ALIGNMENT // SectionAlignment > > + .long PECOFF_FILE_ALIGNMENT // FileAlignment > > + .short 0 // MajorOperatingSystemVersion > > + .short 0 // MinorOperatingSystemVersion > > + .short LINUX_EFISTUB_MAJOR_VERSION // MajorImageVersion > > + .short LINUX_EFISTUB_MINOR_VERSION // MinorImageVersion > > + .short 0 // MajorSubsystemVersion > > + .short 0 // MinorSubsystemVersion > > + .long 0 // Win32VersionValue > > + > > + .long _end - _start // SizeOfImage > > + > > + // Everything before the kernel image is considered part of the header > > + .long efi_header_end - _start // SizeOfHeaders > > + .long 0 // CheckSum > > + .short IMAGE_SUBSYSTEM_EFI_APPLICATION // Subsystem > > + .short 0 // DllCharacteristics > > + .quad 0 // SizeOfStackReserve > > + .quad 0 // SizeOfStackCommit > > + .quad 0 // SizeOfHeapReserve > > + .quad 0 // SizeOfHeapCommit > > + .long 0 // LoaderFlags > > + .long (section_table - .) / 8 // NumberOfRvaAndSizes > > + > > + .quad 0 // ExportTable > > + .quad 0 // ImportTable > > + .quad 0 // ResourceTable > > + .quad 0 // ExceptionTable > > + .quad 0 // CertificationTable > > + .quad 0 // BaseRelocationTable > > + > > + // Section table > > +section_table: > > + .ascii ".text\0\0\0" > > + .long __pecoff_text_end - efi_header_end // VirtualSize > > + .long efi_header_end - _start // VirtualAddress > > + .long __pecoff_text_end - efi_header_end // SizeOfRawData > > + .long efi_header_end - _start // PointerToRawData > > + > > + .long 0 // PointerToRelocations > > + .long 0 // PointerToLineNumbers > > + .short 0 // NumberOfRelocations > > + .short 0 // NumberOfLineNumbers > > + .long IMAGE_SCN_CNT_CODE | \ > > + IMAGE_SCN_MEM_READ | \ > > + IMAGE_SCN_MEM_EXECUTE // Characteristics > > + > > + .ascii ".data\0\0\0" > > + .long __pecoff_data_virt_size // VirtualSize > > + .long __pecoff_text_end - _start // VirtualAddress > > + .long __pecoff_data_raw_size // SizeOfRawData > > + .long __pecoff_text_end - _start // PointerToRawData > > + > > + .long 0 // PointerToRelocations > > + .long 0 // PointerToLineNumbers > > + .short 0 // NumberOfRelocations > > + .short 0 // NumberOfLineNumbers > > + .long IMAGE_SCN_CNT_INITIALIZED_DATA | \ > > + IMAGE_SCN_MEM_READ | \ > > + IMAGE_SCN_MEM_WRITE // Characteristics > > + > > + .set section_count, (. - section_table) / 40 > > + > > + .balign 0x1000 > > +efi_header_end: > > + .endm > > diff --git a/arch/riscv/kernel/head.S b/arch/riscv/kernel/head.S > > index c6a37e8231a8..3631147732ee 100644 > > --- a/arch/riscv/kernel/head.S > > +++ b/arch/riscv/kernel/head.S > > @@ -13,6 +13,7 @@ > > #include > > #include > > #include > > +#include "efi-header.S" > > > > __HEAD > > ENTRY(_start) > > @@ -22,10 +23,18 @@ ENTRY(_start) > > * Do not modify it without modifying the structure and all bootloaders > > * that expects this header format!! > > */ > > +#ifdef CONFIG_EFI > > + /* > > + * This instruction decodes to "MZ" ASCII required by UEFI. > > + */ > > + c.li s4,-13 > > + j _start_kernel > > +#else > > /* jump to start kernel */ > > j _start_kernel > > /* reserved */ > > .word 0 > > +#endif > > .balign 8 > > #if __riscv_xlen == 64 > > /* Image load offset(2MB) from start of RAM */ > > @@ -43,7 +52,14 @@ ENTRY(_start) > > .ascii RISCV_IMAGE_MAGIC > > .balign 4 > > .ascii RISCV_IMAGE_MAGIC2 > > +#ifdef CONFIG_EFI > > + .word pe_head_start - _start > > +pe_head_start: > > + > > + __EFI_PE_HEADER > > +#else > > .word 0 > > +#endif > > > > .align 2 > > #ifdef CONFIG_MMU > > diff --git a/arch/riscv/kernel/image-vars.h b/arch/riscv/kernel/image-vars.h > > new file mode 100644 > > index 000000000000..8c212efb37a6 > > --- /dev/null > > +++ b/arch/riscv/kernel/image-vars.h > > @@ -0,0 +1,51 @@ > > +/* SPDX-License-Identifier: GPL-2.0-only */ > > +/* > > + * Copyright (C) 2020 Western Digital Corporation or its affiliates. > > + * Linker script variables to be set after section resolution, as > > + * ld.lld does not like variables assigned before SECTIONS is processed. > > + * Based on arch/arm64/kerne/image-vars.h > > + */ > > +#ifndef __RISCV_KERNEL_IMAGE_VARS_H > > +#define __RISCV_KERNEL_IMAGE_VARS_H > > + > > +#ifndef LINKER_SCRIPT > > +#error This file should only be included in vmlinux.lds.S > > +#endif > > + > > +#ifdef CONFIG_EFI > > + > > +/* > > + * The EFI stub has its own symbol namespace prefixed by __efistub_, to > > + * isolate it from the kernel proper. The following symbols are legally > > + * accessed by the stub, so provide some aliases to make them accessible. > > + * Only include data symbols here, or text symbols of functions that are > > + * guaranteed to be safe when executed at another offset than they were > > + * linked at. The routines below are all implemented in assembler in a > > + * position independent manner > > + */ > > +__efistub_memcmp = memcmp; > > +__efistub_memchr = memchr; > > +__efistub_memcpy = memcpy; > > +__efistub_memmove = memmove; > > +__efistub_memset = memset; > > +__efistub_strlen = strlen; > > +__efistub_strnlen = strnlen; > > +__efistub_strcmp = strcmp; > > +__efistub_strncmp = strncmp; > > +__efistub_strrchr = strrchr; > > + > > +#ifdef CONFIG_KASAN > > +__efistub___memcpy = memcpy; > > +__efistub___memmove = memmove; > > +__efistub___memset = memset; > > +#endif > > + > > +__efistub__start = _start; > > +__efistub__start_kernel = _start_kernel; > > +__efistub__end = _end; > > +__efistub__edata = _edata; > > +__efistub_screen_info = screen_info; > > + > > +#endif > > + > > +#endif /* __RISCV_KERNEL_IMAGE_VARS_H */ > > diff --git a/arch/riscv/kernel/vmlinux.lds.S b/arch/riscv/kernel/vmlinux.lds.S > > index f3586e31ed1e..6dcf790282dd 100644 > > --- a/arch/riscv/kernel/vmlinux.lds.S > > +++ b/arch/riscv/kernel/vmlinux.lds.S > > @@ -10,6 +10,7 @@ > > #include > > #include > > #include > > +#include "image-vars.h" > > > > #include > > OUTPUT_ARCH(riscv) > > @@ -17,6 +18,9 @@ ENTRY(_start) > > > > jiffies = jiffies_64; > > > > +PECOFF_SECTION_ALIGNMENT = 0x1000; > > +PECOFF_FILE_ALIGNMENT = 0x200; > > + > > SECTIONS > > { > > /* Beginning of code and text segment */ > > @@ -76,6 +80,10 @@ SECTIONS > > > > EXCEPTION_TABLE(0x10) > > > > +#ifdef CONFIG_EFI > > + . = ALIGN(PECOFF_SECTION_ALIGNMENT); > > + __pecoff_text_end = .; > > +#endif > > . = ALIGN(SECTION_ALIGN); > > _data = .; > > > > @@ -83,16 +91,26 @@ SECTIONS > > .sdata : { > > __global_pointer$ = . + 0x800; > > *(.sdata*) > > - /* End of data section */ > > - _edata = .; > > } > > > > +#ifdef CONFIG_EFI > > + .pecoff_edata_padding : { BYTE(0); . = ALIGN(PECOFF_FILE_ALIGNMENT); } > > + __pecoff_data_raw_size = ABSOLUTE(. - __pecoff_text_end); > > +#endif > > + > > + /* End of data section */ > > + _edata = .; > > + > > BSS_SECTION(PAGE_SIZE, PAGE_SIZE, 0) > > > > .rel.dyn : { > > *(.rel.dyn*) > > } > > > > +#ifdef CONFIG_EFI > > + . = ALIGN(PECOFF_SECTION_ALIGNMENT); > > + __pecoff_data_virt_size = ABSOLUTE(. - __pecoff_text_end); > > +#endif > > _end = .; > > > > STABS_DEBUG -- Regards, Atish _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv