[PATCH 11/13] efi: fix lds for secure boot support

[Michael Olbrich]

On Sun, Mar 26, 2017 at 04:45:02AM +0200, Jean-Christophe PLAGNIOL-VILLARD wrote:
> everythink need to be aligned to 4096

As Lucas noted the last time, this deserves a comment why this is needed.
Just a reference to the EFI spec (I think?) or something like that.

> Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj at jcrosoft.com>
> ---
>  arch/x86/mach-efi/elf_ia32_efi.lds.S         | 10 +++++++---
>  arch/x86/mach-efi/elf_x86_64_efi.lds.S       | 10 ++++++----
>  arch/x86/mach-efi/include/mach/barebox.lds.h | 14 +++++++++++++-
>  include/asm-generic/barebox.lds.h            |  8 +++++---
>  4 files changed, 31 insertions(+), 11 deletions(-)
> 
> diff --git a/arch/x86/mach-efi/elf_ia32_efi.lds.S b/arch/x86/mach-efi/elf_ia32_efi.lds.S
> index 69f43f554..6d9cb973c 100644
> --- a/arch/x86/mach-efi/elf_ia32_efi.lds.S
> +++ b/arch/x86/mach-efi/elf_ia32_efi.lds.S
> @@ -50,22 +50,23 @@ SECTIONS
>  		*(COMMON)
>  	}
>  
> -	. = ALIGN(64);
> +	. = ALIGN(4096);
>  
>  	__barebox_initcalls_start = .;
>  	__barebox_initcalls : { INITCALLS }
>  	__barebox_initcalls_end = .;
> +	. = ALIGN(4096);
>  
>  	__barebox_exitcalls_start = .;
>  	__barebox_exitcalls : { EXITCALLS }
>  	__barebox_exitcalls_end = .;
>  
> -	. = ALIGN(64);
> +	. = ALIGN(4096);
>  	__barebox_magicvar_start = .;
>  	.barebox_magicvar : { BAREBOX_MAGICVARS }
>  	__barebox_magicvar_end = .;
>  
> -	. = ALIGN(64);
> +	. = ALIGN(4096);
>  	__barebox_cmd_start = .;
>  	__barebox_cmd : { BAREBOX_CMDS }
>  	__barebox_cmd_end = .;
> @@ -76,6 +77,9 @@ SECTIONS
>  	.rel : {
>  		*(.rel.data)
>  		*(.rel.data.*)
> +		*(.rela.barebox*)
> +		*(.rela.initcall*)
> +		*(.rela.exitcall*)

This is unrelated and should be a different patch.

>  		*(.rel.got)
>  		*(.rel.stab)
>  		*(.data.rel.ro.local)
> diff --git a/arch/x86/mach-efi/elf_x86_64_efi.lds.S b/arch/x86/mach-efi/elf_x86_64_efi.lds.S
> index 93d34d17a..8216d1d70 100644
> --- a/arch/x86/mach-efi/elf_x86_64_efi.lds.S
> +++ b/arch/x86/mach-efi/elf_x86_64_efi.lds.S
> @@ -23,6 +23,7 @@ SECTIONS
>  		*(.text)
>  		*(.text.*)
>  		*(.gnu.linkonce.t.*)
> +		. = ALIGN(16);

Why 16 here?

Regards,
Michael

>  	}
>  
>  	_etext = .;
> @@ -33,8 +34,8 @@ SECTIONS
>  		*(.reloc)
>  	}
>  
> -	. = ALIGN(4096);
>  	_sdata = .;
> +	. = ALIGN(4096);
>  
>  	.data : {
>  		*(.rodata*)
> @@ -52,22 +53,23 @@ SECTIONS
>  		*(.rel.local)
>  	}
>  
> -	. = ALIGN(64);
> +	. = ALIGN(4096);
>  
>  	__barebox_initcalls_start = .;
>  	__barebox_initcalls : { INITCALLS }
>  	__barebox_initcalls_end = .;
> +	. = ALIGN(4096);
>  
>  	__barebox_exitcalls_start = .;
>  	__barebox_exitcalls : { EXITCALLS }
>  	__barebox_exitcalls_end = .;
>  
> -	. = ALIGN(64);
> +	. = ALIGN(4096);
>  	__barebox_magicvar_start = .;
>  	.barebox_magicvar : { BAREBOX_MAGICVARS }
>  	__barebox_magicvar_end = .;
>  
> -	. = ALIGN(64);
> +	. = ALIGN(4096);
>  	__barebox_cmd_start = .;
>  	__barebox_cmd : { BAREBOX_CMDS }
>  	__barebox_cmd_end = .;
> diff --git a/arch/x86/mach-efi/include/mach/barebox.lds.h b/arch/x86/mach-efi/include/mach/barebox.lds.h
> index 40a8c178f..e7a3bb9cd 100644
> --- a/arch/x86/mach-efi/include/mach/barebox.lds.h
> +++ b/arch/x86/mach-efi/include/mach/barebox.lds.h
> @@ -1 +1,13 @@
> -/* empty */
> +/*
> + * Copyright (C) 2017 Jean-Christophe PLAGNIOL-VILLARD <plagnio at jcrosoft.com>
> + *
> + * Under GPL v2
> + */
> +
> +#ifndef __EFI_MACH_BAREBOX_LDS_H__
> +#define __EFI_MACH_BAREBOX_LDS_H__
> +
> +/* For secure boot we need all the section to be 4096 alligned */
> +#define STRUCT_ALIGNMENT 4096
> +
> +#endif /* __EFI_MACH_BAREBOX_LDS_H__ */
> diff --git a/include/asm-generic/barebox.lds.h b/include/asm-generic/barebox.lds.h
> index c8a919b92..6c37751b3 100644
> --- a/include/asm-generic/barebox.lds.h
> +++ b/include/asm-generic/barebox.lds.h
> @@ -3,15 +3,17 @@
>   * Align to a 32 byte boundary equal to the
>   * alignment gcc 4.5 uses for a struct
>   */
> -#define STRUCT_ALIGNMENT 32
> -#define STRUCT_ALIGN() . = ALIGN(STRUCT_ALIGNMENT)
> -
>  #if defined CONFIG_X86 || \
>  	defined CONFIG_ARCH_EP93XX || \
>  	defined CONFIG_ARCH_ZYNQ
>  #include <mach/barebox.lds.h>
>  #endif
>  
> +#ifndef STRUCT_ALIGNMENT
> +#define STRUCT_ALIGNMENT 32
> +#endif
> +#define STRUCT_ALIGN() . = ALIGN(STRUCT_ALIGNMENT)
> +
>  #ifndef PRE_IMAGE
>  #define PRE_IMAGE
>  #endif
> -- 
> 2.11.0
> 
> 
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> barebox at lists.infradead.org
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> 

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