From: Ard Biesheuvel <ardb@kernel.org>
To: Arvind Sankar <nivedita@alum.mit.edu>
Cc: linux-efi <linux-efi@vger.kernel.org>,
Linux ARM <linux-arm-kernel@lists.infradead.org>,
X86 ML <x86@kernel.org>, Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 1/5] efi/arm: Remove __efistub_global annotation
Date: Thu, 16 Apr 2020 09:50:36 +0200 [thread overview]
Message-ID: <CAMj1kXE7aNm5XWrB2PkEedXA02gGmpcPW7rjziAXeTSPL_786A@mail.gmail.com> (raw)
In-Reply-To: <20200415221520.2692512-2-nivedita@alum.mit.edu>
On Thu, 16 Apr 2020 at 00:15, Arvind Sankar <nivedita@alum.mit.edu> wrote:
>
> Instead of using __efistub_global to force variables into the .data
> section, leave them in the .bss but pull the EFI stub's .bss section
> into .data in the linker script for the compressed kernel.
>
> Signed-off-by: Arvind Sankar <nivedita@alum.mit.edu>
Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
> ---
> arch/arm/boot/compressed/vmlinux.lds.S | 2 +-
> drivers/firmware/efi/libstub/Makefile | 7 ++++---
> drivers/firmware/efi/libstub/efistub.h | 2 +-
> 3 files changed, 6 insertions(+), 5 deletions(-)
>
> diff --git a/arch/arm/boot/compressed/vmlinux.lds.S b/arch/arm/boot/compressed/vmlinux.lds.S
> index b247f399de71..b6793c7932a9 100644
> --- a/arch/arm/boot/compressed/vmlinux.lds.S
> +++ b/arch/arm/boot/compressed/vmlinux.lds.S
> @@ -78,7 +78,7 @@ SECTIONS
> * The EFI stub always executes from RAM, and runs strictly before the
> * decompressor, so we can make an exception for its r/w data, and keep it
> */
> - *(.data.efistub)
> + *(.data.efistub .bss.efistub)
> __pecoff_data_end = .;
>
> /*
> diff --git a/drivers/firmware/efi/libstub/Makefile b/drivers/firmware/efi/libstub/Makefile
> index 094eabdecfe6..45ffe0822df1 100644
> --- a/drivers/firmware/efi/libstub/Makefile
> +++ b/drivers/firmware/efi/libstub/Makefile
> @@ -100,8 +100,9 @@ quiet_cmd_stubcopy = STUBCPY $@
>
> #
> # ARM discards the .data section because it disallows r/w data in the
> -# decompressor. So move our .data to .data.efistub, which is preserved
> -# explicitly by the decompressor linker script.
> +# decompressor. So move our .data to .data.efistub and .bss to .bss.efistub,
> +# which are preserved explicitly by the decompressor linker script.
> #
> -STUBCOPY_FLAGS-$(CONFIG_ARM) += --rename-section .data=.data.efistub
> +STUBCOPY_FLAGS-$(CONFIG_ARM) += --rename-section .data=.data.efistub \
> + --rename-section .bss=.bss.efistub,load,alloc
> STUBCOPY_RELOC-$(CONFIG_ARM) := R_ARM_ABS
> diff --git a/drivers/firmware/efi/libstub/efistub.h b/drivers/firmware/efi/libstub/efistub.h
> index bd0b86b63936..a92d42ffd9f7 100644
> --- a/drivers/firmware/efi/libstub/efistub.h
> +++ b/drivers/firmware/efi/libstub/efistub.h
> @@ -25,7 +25,7 @@
> #define EFI_ALLOC_ALIGN EFI_PAGE_SIZE
> #endif
>
> -#if defined(CONFIG_ARM) || defined(CONFIG_X86)
> +#if defined(CONFIG_X86)
> #define __efistub_global __section(.data)
> #else
> #define __efistub_global
> --
> 2.24.1
>
next prev parent reply other threads:[~2020-04-16 7:50 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-15 22:15 [PATCH 0/5] efi: Remove __efistub_global annotation Arvind Sankar
2020-04-15 22:15 ` [PATCH 1/5] efi/arm: " Arvind Sankar
2020-04-16 7:50 ` Ard Biesheuvel [this message]
2020-04-15 22:15 ` [PATCH 2/5] efi/libstub: Factor out relocation checking Arvind Sankar
2020-04-15 22:15 ` [PATCH 3/5] efi/x86: Remove __efistub_global annotation Arvind Sankar
2020-04-16 7:51 ` Ard Biesheuvel
2020-04-15 22:15 ` [PATCH 4/5] efi: Kill __efistub_global Arvind Sankar
2020-04-16 7:51 ` Ard Biesheuvel
2020-04-15 22:15 ` [PATCH 5/5] efi/x86: Check for bad relocations Arvind Sankar
2020-04-16 7:38 ` Ard Biesheuvel
2020-04-16 14:48 ` Arvind Sankar
2020-04-16 15:12 ` [PATCH v2 0/3] efi: Remove __efistub_global annotation Arvind Sankar
2020-04-16 16:01 ` Ard Biesheuvel
2020-04-16 15:12 ` [PATCH v2 1/3] efi/arm: " Arvind Sankar
2020-04-16 15:12 ` [PATCH v2 2/3] efi/x86: Remove __efistub_global and add relocation check Arvind Sankar
2020-04-16 15:12 ` [PATCH v2 3/3] efi: Kill __efistub_global Arvind Sankar
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=CAMj1kXE7aNm5XWrB2PkEedXA02gGmpcPW7rjziAXeTSPL_786A@mail.gmail.com \
--to=ardb@kernel.org \
--cc=bp@alien8.de \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-efi@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=mingo@redhat.com \
--cc=nivedita@alum.mit.edu \
--cc=tglx@linutronix.de \
--cc=x86@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).