From patchwork Fri Oct 11 08:52:41 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Frediano Ziglio X-Patchwork-Id: 13832235 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 lists.xenproject.org (lists.xenproject.org [192.237.175.120]) (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 009A9CFD2EF for ; Fri, 11 Oct 2024 08:53:10 +0000 (UTC) Received: from list by lists.xenproject.org with outflank-mailman.816777.1230898 (Exim 4.92) (envelope-from ) id 1szBON-00025B-VE; Fri, 11 Oct 2024 08:52:59 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 816777.1230898; Fri, 11 Oct 2024 08:52:59 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1szBON-00022y-NQ; Fri, 11 Oct 2024 08:52:59 +0000 Received: by outflank-mailman (input) for mailman id 816777; Fri, 11 Oct 2024 08:52:58 +0000 Received: from se1-gles-sth1-in.inumbo.com ([159.253.27.254] helo=se1-gles-sth1.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1szBOM-0001pc-Qd for xen-devel@lists.xenproject.org; Fri, 11 Oct 2024 08:52:58 +0000 Received: from mail-ej1-x631.google.com (mail-ej1-x631.google.com [2a00:1450:4864:20::631]) by se1-gles-sth1.inumbo.com (Halon) with ESMTPS id 365cef9e-87ae-11ef-a0bd-8be0dac302b0; Fri, 11 Oct 2024 10:52:57 +0200 (CEST) Received: by mail-ej1-x631.google.com with SMTP id a640c23a62f3a-a9950d27234so258743266b.1 for ; Fri, 11 Oct 2024 01:52:57 -0700 (PDT) Received: from fziglio-desktop.. ([185.25.67.249]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-a99a80dc290sm186131566b.155.2024.10.11.01.52.56 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 11 Oct 2024 01:52:56 -0700 (PDT) X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" X-Inumbo-ID: 365cef9e-87ae-11ef-a0bd-8be0dac302b0 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=cloud.com; s=cloud; t=1728636777; x=1729241577; darn=lists.xenproject.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=zUggCQPTyO9ygn34x4HeSgdbn1nIPGVC8lBKowza6Ww=; b=ULZgpcC2Pc+Aeh+HNXd07K/EkIz33sD8izpgx4x3Zn9Izdc1IUm7yndfjpn6AfbJzs 4ocFyy73DRTfxHQPtpdLO87sMQZoxlx0M4kb0C5n5PFHx6gxqWK7bSF4ikZPNOe2A7hr FNVrSnjJwScHfvf6J/6HWV9qhtIvLWVrjJd6c= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1728636777; x=1729241577; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=zUggCQPTyO9ygn34x4HeSgdbn1nIPGVC8lBKowza6Ww=; b=xRAbEhaGZiOnjJUiuH0/3tujEaE1wpLXznwgdD+s2vAU3374rVywQAT45NZ4bI4Krt ekJYY9HwjcLYSI+wFvhD7WQYveQxpa00H7XbZEXXr+t0XpKtmoDWF7lzL+2KSLLWTzjr 1O7Y2WPnQYNeFqDA7pCezq7s6pyDxMIT6LfYZBnRxQU5tG1wpjMzRBwa3kzKp/OP1/NY ln4e/atGrdLMtnGAq2W62POxEfZFSudKhbkneT7EgCRiZfRHilB8iFPDp7ddTf7pBxWS P49WLxveELQCzQURrjtLY/pNTVjYJ7Kuxv7jYLEaz3GlhMsovEMu2X8ny3BWFa3A0xi3 FjvQ== X-Gm-Message-State: AOJu0Yzv/d4RrN9Ka9gh8bmDOhe/s2hH4U5LJXYDLgaAO+ykuihdM+jz mQ1mGJT8SBmPFJ+17r5zKDM31ZymyMqm63yf0FnRL20tkkBxbo0Mh4aHxa1AfgkVQEP6uUwFJdv 5 X-Google-Smtp-Source: AGHT+IH65Eld8JdkIAY7cU2W6Ra7H+4tZO/nE4hRKbWIgqgRMd1GZ4mpQGirx+/zNR0Btne7p1Lvxg== X-Received: by 2002:a17:907:7ea4:b0:a99:408c:6a16 with SMTP id a640c23a62f3a-a99b9315e79mr138590366b.12.1728636776928; Fri, 11 Oct 2024 01:52:56 -0700 (PDT) From: Frediano Ziglio To: xen-devel@lists.xenproject.org Cc: Frediano Ziglio , Jan Beulich , Andrew Cooper , =?utf-8?q?Roger_Pau_Monn=C3=A9?= , "Daniel P. Smith" , =?utf-8?q?Marek_Marczykow?= =?utf-8?q?ski-G=C3=B3recki?= Subject: [PATCH v3 2/5] x86/boot: Reuse code to relocate trampoline Date: Fri, 11 Oct 2024 09:52:41 +0100 Message-Id: <20241011085244.432368-3-frediano.ziglio@cloud.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20241011085244.432368-1-frediano.ziglio@cloud.com> References: <20241011085244.432368-1-frediano.ziglio@cloud.com> MIME-Version: 1.0 Move code from efi-boot.h to a separate, new, reloc-trampoline.c file. Reuse this new code to replace assembly code in head.S doing the same thing. Signed-off-by: Frediano Ziglio --- xen/arch/x86/boot/Makefile | 12 ++++++---- xen/arch/x86/boot/build32.lds.S | 5 ++++ xen/arch/x86/boot/head.S | 23 +----------------- xen/arch/x86/boot/reloc-trampoline.c | 36 ++++++++++++++++++++++++++++ xen/arch/x86/efi/efi-boot.h | 15 ++---------- 5 files changed, 52 insertions(+), 39 deletions(-) create mode 100644 xen/arch/x86/boot/reloc-trampoline.c diff --git a/xen/arch/x86/boot/Makefile b/xen/arch/x86/boot/Makefile index 4cf0d7e140..24b4b0cb17 100644 --- a/xen/arch/x86/boot/Makefile +++ b/xen/arch/x86/boot/Makefile @@ -1,14 +1,18 @@ obj32 := cmdline.o obj32 += reloc.o +obj32 += reloc-trampoline.o + +obj64 := reloc-trampoline.o obj-bin-y += head.o obj-bin-y += built_in_32.o +obj-bin-y += $(obj64) obj32 := $(patsubst %.o,%.32.o,$(obj32)) -nocov-y += $(obj32) -noubsan-y += $(obj32) -targets += $(obj32) +nocov-y += $(obj32) $(obj64) +noubsan-y += $(obj32) $(obj64) +targets += $(obj32) $(obj64) obj32 := $(addprefix $(obj)/,$(obj32)) @@ -55,7 +59,7 @@ $(obj)/built_in_32.o: $(obj)/built_in_32.other.bin $(obj)/built_in_32.final.bin --script $(obj)/build32.final.lds \ --bin1 $(obj)/built_in_32.other.bin --bin2 $(obj)/built_in_32.final.bin \ --map $(obj)/built_in_32.final.map \ - --exports cmdline_parse_early,reloc \ + --exports cmdline_parse_early,reloc,reloc_trampoline32 \ --section-header '.section .init.text, "ax", @progbits' \ --output $(obj)/built_in_32.s $(CC) -c $(obj)/built_in_32.s -o $@.tmp diff --git a/xen/arch/x86/boot/build32.lds.S b/xen/arch/x86/boot/build32.lds.S index 72a4c5c614..9d09e3adbd 100644 --- a/xen/arch/x86/boot/build32.lds.S +++ b/xen/arch/x86/boot/build32.lds.S @@ -41,6 +41,11 @@ SECTIONS * Potentially they should be all variables. */ DECLARE_IMPORT(__base_relocs_start); DECLARE_IMPORT(__base_relocs_end); + DECLARE_IMPORT(__trampoline_rel_start); + DECLARE_IMPORT(__trampoline_rel_stop); + DECLARE_IMPORT(__trampoline_seg_start); + DECLARE_IMPORT(__trampoline_seg_stop); + DECLARE_IMPORT(trampoline_phys); . = . + GAP; *(.text) *(.text.*) diff --git a/xen/arch/x86/boot/head.S b/xen/arch/x86/boot/head.S index e0776e3896..ade2c5c43d 100644 --- a/xen/arch/x86/boot/head.S +++ b/xen/arch/x86/boot/head.S @@ -706,28 +706,7 @@ trampoline_setup: mov %edx, sym_offs(l1_bootmap)(%esi, %ecx, 8) /* Apply relocations to bootstrap trampoline. */ - mov sym_esi(trampoline_phys), %edx - lea sym_esi(__trampoline_rel_start), %edi - lea sym_esi(__trampoline_rel_stop), %ecx -1: - mov (%edi), %eax - add %edx, (%edi, %eax) - add $4,%edi - - cmp %ecx, %edi - jb 1b - - /* Patch in the trampoline segment. */ - shr $4,%edx - lea sym_esi(__trampoline_seg_start), %edi - lea sym_esi(__trampoline_seg_stop), %ecx -1: - mov (%edi), %eax - mov %dx, (%edi, %eax) - add $4,%edi - - cmp %ecx, %edi - jb 1b + call reloc_trampoline32 /* Do not parse command line on EFI platform here. */ cmpb $0, sym_esi(efi_platform) diff --git a/xen/arch/x86/boot/reloc-trampoline.c b/xen/arch/x86/boot/reloc-trampoline.c new file mode 100644 index 0000000000..c899e99b08 --- /dev/null +++ b/xen/arch/x86/boot/reloc-trampoline.c @@ -0,0 +1,36 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ + +#include +#include +#include + +extern const int32_t __trampoline_rel_start[], __trampoline_rel_stop[]; +extern const int32_t __trampoline_seg_start[], __trampoline_seg_stop[]; + +#if defined(__i386__) +void reloc_trampoline32(void) +#elif defined (__x86_64__) +void reloc_trampoline64(void) +#else +#error Unknow architecture +#endif +{ + unsigned long phys = trampoline_phys; + const int32_t *trampoline_ptr; + + /* + * Apply relocations to trampoline. + * + * This modifies the trampoline in place within Xen, so that it will + * operate correctly when copied into place. + */ + for ( trampoline_ptr = __trampoline_rel_start; + trampoline_ptr < __trampoline_rel_stop; + ++trampoline_ptr ) + *(uint32_t *)(*trampoline_ptr + (long)trampoline_ptr) += phys; + + for ( trampoline_ptr = __trampoline_seg_start; + trampoline_ptr < __trampoline_seg_stop; + ++trampoline_ptr ) + *(uint16_t *)(*trampoline_ptr + (long)trampoline_ptr) = phys >> 4; +} diff --git a/xen/arch/x86/efi/efi-boot.h b/xen/arch/x86/efi/efi-boot.h index 94f3443364..1acceec471 100644 --- a/xen/arch/x86/efi/efi-boot.h +++ b/xen/arch/x86/efi/efi-boot.h @@ -103,27 +103,16 @@ static void __init efi_arch_relocate_image(unsigned long delta) } } -extern const int32_t __trampoline_rel_start[], __trampoline_rel_stop[]; -extern const int32_t __trampoline_seg_start[], __trampoline_seg_stop[]; +void reloc_trampoline64(void); static void __init relocate_trampoline(unsigned long phys) { - const int32_t *trampoline_ptr; - trampoline_phys = phys; if ( !efi_enabled(EFI_LOADER) ) return; - /* Apply relocations to trampoline. */ - for ( trampoline_ptr = __trampoline_rel_start; - trampoline_ptr < __trampoline_rel_stop; - ++trampoline_ptr ) - *(u32 *)(*trampoline_ptr + (long)trampoline_ptr) += phys; - for ( trampoline_ptr = __trampoline_seg_start; - trampoline_ptr < __trampoline_seg_stop; - ++trampoline_ptr ) - *(u16 *)(*trampoline_ptr + (long)trampoline_ptr) = phys >> 4; + reloc_trampoline64(); } static void __init place_string(u32 *addr, const char *s)