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([185.25.67.249]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-a9a29817036sm299115166b.124.2024.10.17.06.31.34 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 17 Oct 2024 06:31:35 -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: 21e28026-8c8c-11ef-99a3-01e77a169b0f DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=cloud.com; s=cloud; t=1729171895; x=1729776695; 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=fZ9CyilDRJ9hcc5UhF8AJZBpprsEzy6yq5x+V3+UrsI=; b=VsqWJvTFpUpAfXUeLi2nmZXtXAGgj8Gj7J7kfvj3iVP5V2T5qf2XJzc87lISwuvGvw 7Vy7c9NN277GE4HhjovzrekxUmZtxABHKG1H43Ld7u6jSZsfyjH+WkQ+F/Df05JkK7Fm j0t0McbpFVxqWrJVwHYoLokvZVI6oH9N5hlao= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1729171895; x=1729776695; 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=fZ9CyilDRJ9hcc5UhF8AJZBpprsEzy6yq5x+V3+UrsI=; b=T7pIfrPvUVL67Inwp7kb9BktCZS8KOAY/4b4pyPMn/D/S/w6ZfeHMBzsP1SY343U50 FGPC4VvosYoXIJ2WgHG51kBhRYdQ8TuLhkzAQ0lugI3Bk2ln4T7E9T1AUKkwoAzLCydT pyoBzHsHfYSgNeNX34ZogPCx0HReadZUKfR6I/Oj2GKK+Un8qtiWVngV4Df/nQ6X0TVa 1B2MTTLXjP35IMcaelXNNTQYBuxkDppT7KN2Dtd8ryCw2JKYh6mg4h3WXj9xdlCE7x/4 AZjlIMpcXbT1G6VTsAGfhXzuauzoIMiIOr37K/i5Coi54qKcNZFJ3k9JY4FdRC1IrR0D Ni7Q== X-Gm-Message-State: AOJu0YwWcC+/o8VEIAUdhnNucZgr2ECfav56bVBWzGQcckSBAm+s9Yad TyL3ungXmsG1M9sM3KEUOtM8qXRgL7SmmYgEsslQ2dUot/piDoMlOZm7sTaVb2h7L7+pXYjKPUf b X-Google-Smtp-Source: AGHT+IErctvAnrUFXio0tyEeDTz1agZ8lWqX/qFwPX6eTI7Ki7+QcjFIYjiah0Jl/0rakksP8ZAvxQ== X-Received: by 2002:a05:6512:2384:b0:539:ea66:597e with SMTP id 2adb3069b0e04-53a03f07225mr5393227e87.2.1729171895361; Thu, 17 Oct 2024 06:31:35 -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 v6 2/5] x86/boot: Reuse code to relocate trampoline Date: Thu, 17 Oct 2024 14:31:20 +0100 Message-Id: <20241017133123.1946204-3-frediano.ziglio@cloud.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20241017133123.1946204-1-frediano.ziglio@cloud.com> References: <20241017133123.1946204-1-frediano.ziglio@cloud.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @cloud.com) X-ZM-MESSAGEID: 1729171947175116600 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 Acked-by: Marek Marczykowski-G=C3=B3recki --- Changes since v3: - fixed a typo in comment; - added Reviewed-by. Changes since v5: - do not add obj64 to targets, already done adding it to obj-bin-y. --- xen/arch/x86/boot/Makefile | 10 +++++--- 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, 51 insertions(+), 38 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 5da19501be..98ceb1983d 100644 --- a/xen/arch/x86/boot/Makefile +++ b/xen/arch/x86/boot/Makefile @@ -1,11 +1,15 @@ 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) +obj64 :=3D reloc-trampoline.o + +nocov-y +=3D $(obj32) $(obj64) +noubsan-y +=3D $(obj32) $(obj64) targets +=3D $(obj32) =20 obj32 :=3D $(addprefix $(obj)/,$(obj32)) @@ -56,7 +60,7 @@ cmd_combine =3D \ --bin1 $(obj)/built-in-32.base.bin \ --bin2 $(obj)/built-in-32.offset.bin \ --map $(obj)/built-in-32.offset.map \ - --exports cmdline_parse_early,reloc \ + --exports cmdline_parse_early,reloc,reloc_trampoline32 \ --output $@ =20 targets +=3D built-in-32.S diff --git a/xen/arch/x86/boot/build32.lds.S b/xen/arch/x86/boot/build32.ld= s.S index e3f5e55261..fa282370f4 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