From nobody Sun Nov 24 06:37:50 2024 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) client-ip=192.237.175.120; envelope-from=xen-devel-bounces@lists.xenproject.org; helo=lists.xenproject.org; Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) smtp.mailfrom=xen-devel-bounces@lists.xenproject.org; dmarc=pass(p=reject dis=none) header.from=cloud.com ARC-Seal: i=1; a=rsa-sha256; t=1728896065; cv=none; d=zohomail.com; s=zohoarc; b=KJMwR8MR4t5YqLzCicz4kohz6Pz2fY7mCcaOFakZzSs6FoJWJt2+Bd/nvak2t3MYqQXs9z4MnHoh8cgSukC5fj+4nk8JPNoxgci3rgwDc6Q35Px+S8A7edhZATrCkRtt+b/+SoWIO47pLem9jrm5z5Kr9BxPryrou2M45LYDKZg= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1728896065; h=Content-Transfer-Encoding:Cc:Cc:Date:Date:From:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:Subject:To:To:Message-Id:Reply-To; bh=oySDyT4GmL2tsmRjXkrGrh0QdsSZG+8keHHypj0A/K8=; b=m8Sece6mLQEMIOn53IoiY1oBTwvLfnHb/mYs8lpuiGYHxWDRZ97gSwyvogaioO5zueckeDJODGyJ2WPYO/k/hBHGHIH8mp9KG7J7GblchOUP7Ktdkir75j9ILs4B8Hk3J5WUh9fXFWHAIUby6tne6g0XFFCFXxzI5v5GI76/PiI= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) smtp.mailfrom=xen-devel-bounces@lists.xenproject.org; dmarc=pass header.from= (p=reject dis=none) Return-Path: Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) by mx.zohomail.com with SMTPS id 1728896065103466.89994784972043; Mon, 14 Oct 2024 01:54:25 -0700 (PDT) Received: from list by lists.xenproject.org with outflank-mailman.818522.1231848 (Exim 4.92) (envelope-from ) id 1t0Gpq-0000Pm-Fv; Mon, 14 Oct 2024 08:53:50 +0000 Received: by outflank-mailman (output) from mailman id 818522.1231848; Mon, 14 Oct 2024 08:53:50 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1t0Gpq-0000P6-BT; Mon, 14 Oct 2024 08:53:50 +0000 Received: by outflank-mailman (input) for mailman id 818522; Mon, 14 Oct 2024 08:53:48 +0000 Received: from se1-gles-flk1-in.inumbo.com ([94.247.172.50] helo=se1-gles-flk1.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1t0Gpo-00086D-IE for xen-devel@lists.xenproject.org; Mon, 14 Oct 2024 08:53:48 +0000 Received: from mail-lj1-x22a.google.com (mail-lj1-x22a.google.com [2a00:1450:4864:20::22a]) by se1-gles-flk1.inumbo.com (Halon) with ESMTPS id d2e7e01e-8a09-11ef-99a2-01e77a169b0f; Mon, 14 Oct 2024 10:53:47 +0200 (CEST) Received: by mail-lj1-x22a.google.com with SMTP id 38308e7fff4ca-2fb4af0b6beso8593321fa.3 for ; Mon, 14 Oct 2024 01:53:47 -0700 (PDT) Received: from fziglio-desktop.. ([185.25.67.249]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-a99a80f2446sm551817766b.206.2024.10.14.01.53.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 14 Oct 2024 01:53:45 -0700 (PDT) X-Outflank-Mailman: Message body and most headers restored to incoming version 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: d2e7e01e-8a09-11ef-99a2-01e77a169b0f DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=cloud.com; s=cloud; t=1728896026; x=1729500826; 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=oySDyT4GmL2tsmRjXkrGrh0QdsSZG+8keHHypj0A/K8=; b=Gs4f4U4Ug7Ie82u9os/ec70JMWhcVnX5QSa+LqCNITRycmjzf2NwsxuxPHUkDw4dfA b9k3mCMvrPH+HhjFPNq3iuClSewe/I02zfYbYbd1t4xL0x3cgteyWWcA0RSsF0CMNWHn D/6r8GbJB8JLPzxhdKdDXHubt+ST/yYCK6JgI= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1728896026; x=1729500826; 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=oySDyT4GmL2tsmRjXkrGrh0QdsSZG+8keHHypj0A/K8=; b=VEEkZI0VQ4YFEXyyW+eWCJkBAgvG/QVznNxTHDwZpxkU1DcqhaSCk/jm9fuwIUYZwl GkwrFRIblC38X6UmJKSGKqSOKk0tOFDzgbWzzT/dw1sleVV0jGvrau/ucbI+y9GS/3pJ Z47Eewi2nc2Snvreh29CztNMmXqTJOPx8l59ETImfR2eU+LFLNYT2p5PGDXOKtsr1Jjr 3uEd6kYb4oGXqOEcgyzzkDJP8A3zqLKUW4PM69uqh6oNmFVtGV8KojfcqJROTeJanb/O wU4UXmNqUmKHJyzazgSevZsDxAiLkF/CHw32a4XoWjEJcFPW6fCMvHZe49VAwZdpMl3s roBQ== X-Gm-Message-State: AOJu0YytfXtAc2k78J8XmCeq1e/62OaQak0YEIwyk2kfNqS2pCvNuvWE EzspUgI5ON2vmH2llFBtbsZANb9aZBUXr9Lohrc7LECxYpexBbmkdBwkHpoh7phGXJBxVvftmg7 Q X-Google-Smtp-Source: AGHT+IH9NQoAnD2hbWSP0lmRunEYSkPbvCyiHCPSppmlkL1GMwO06hGOyc9V+oWZYD1MXxkljcKICw== X-Received: by 2002:a05:651c:2220:b0:2fb:3881:35d5 with SMTP id 38308e7fff4ca-2fb3f2c725emr29536201fa.35.1728896026013; Mon, 14 Oct 2024 01:53:46 -0700 (PDT) From: Frediano Ziglio To: xen-devel@lists.xenproject.org Cc: Frediano Ziglio , Jan Beulich , Andrew Cooper , =?UTF-8?q?Roger=20Pau=20Monn=C3=A9?= , "Daniel P. Smith" , =?UTF-8?q?Marek=20Marczykowski-G=C3=B3recki?= Subject: [PATCH v4 3/6] x86/boot: Reuse code to relocate trampoline Date: Mon, 14 Oct 2024 09:53:29 +0100 Message-Id: <20241014085332.3254546-4-frediano.ziglio@cloud.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20241014085332.3254546-1-frediano.ziglio@cloud.com> References: <20241014085332.3254546-1-frediano.ziglio@cloud.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @cloud.com) X-ZM-MESSAGEID: 1728896065548116600 Content-Type: text/plain; charset="utf-8" Move code from efi-boot.h to a separate, new, reloc-trampoline.c file. Reuse this new code, compiling it for 32bit as well, to replace assembly code in head.S doing the same thing. Signed-off-by: Frediano Ziglio Reviewed-by: Andrew Cooper --- Changes since v3: - fixed a typo in comment; - added Reviewed-by. --- 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 23ad274c89..ca258a9729 100644 --- a/xen/arch/x86/boot/Makefile +++ b/xen/arch/x86/boot/Makefile @@ -1,12 +1,16 @@ obj-bin-y +=3D head.o obj-bin-y +=3D built_in_32.o +obj-bin-y +=3D $(obj64) =20 obj32 :=3D cmdline.32.o obj32 +=3D reloc.32.o +obj32 +=3D reloc-trampoline.32.o =20 -nocov-y +=3D $(obj32) -noubsan-y +=3D $(obj32) -targets +=3D $(obj32) +obj64 :=3D reloc-trampoline.o + +nocov-y +=3D $(obj32) $(obj64) +noubsan-y +=3D $(obj32) $(obj64) +targets +=3D $(obj32) $(obj64) =20 obj32 :=3D $(addprefix $(obj)/,$(obj32)) =20 @@ -50,7 +54,7 @@ $(obj)/built_in_32.S: $(obj)/built_in_32.other.bin $(obj)= /built_in_32.final.bin --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 \ --output $@ =20 clean-files :=3D built_in_32.*.bin built_in_32.*.map build32.*.lds diff --git a/xen/arch/x86/boot/build32.lds.S b/xen/arch/x86/boot/build32.ld= s.S index 50c167aef0..1110880ad4 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); . =3D . + 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) =20 /* 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 =20 /* 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..0a74c1e75a --- /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 Unknown architecture +#endif +{ + unsigned long phys =3D 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 =3D __trampoline_rel_start; + trampoline_ptr < __trampoline_rel_stop; + ++trampoline_ptr ) + *(uint32_t *)(*trampoline_ptr + (long)trampoline_ptr) +=3D phys; + + for ( trampoline_ptr =3D __trampoline_seg_start; + trampoline_ptr < __trampoline_seg_stop; + ++trampoline_ptr ) + *(uint16_t *)(*trampoline_ptr + (long)trampoline_ptr) =3D 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 l= ong delta) } } =20 -extern const int32_t __trampoline_rel_start[], __trampoline_rel_stop[]; -extern const int32_t __trampoline_seg_start[], __trampoline_seg_stop[]; +void reloc_trampoline64(void); =20 static void __init relocate_trampoline(unsigned long phys) { - const int32_t *trampoline_ptr; - trampoline_phys =3D phys; =20 if ( !efi_enabled(EFI_LOADER) ) return; =20 - /* Apply relocations to trampoline. */ - for ( trampoline_ptr =3D __trampoline_rel_start; - trampoline_ptr < __trampoline_rel_stop; - ++trampoline_ptr ) - *(u32 *)(*trampoline_ptr + (long)trampoline_ptr) +=3D phys; - for ( trampoline_ptr =3D __trampoline_seg_start; - trampoline_ptr < __trampoline_seg_stop; - ++trampoline_ptr ) - *(u16 *)(*trampoline_ptr + (long)trampoline_ptr) =3D phys >> 4; + reloc_trampoline64(); } =20 static void __init place_string(u32 *addr, const char *s) --=20 2.34.1