arm64: Re-order reserved_ttbr0 in linker script

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Currently one resolves the location of the reserved_ttbr0 for PAN by
taking a positive offset from swapper_pg_dir. In a future patch we wish
to extend the swapper s.t. its size is determined at link time rather
than comile time, rendering SWAPPER_DIR_SIZE unsuitable for such a low
level calculation.

In this patch we re-arrange the order of the linker script s.t. instead
one computes reserved_ttbr0 by subtracting RESERVED_TTBR0_SIZE from
swapper_pg_dir.

Tested-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Steve Capper <steve.capper@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

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Steve Capper 2018-01-11 10:11:57 +00:00 • committed by Catalin Marinas

parent 79e9aa59dc

commit 9dfe4828aa

3 changed files with 8 additions and 9 deletions

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8

arch/arm64/include/asm/asm-uaccess.h

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4

arch/arm64/include/asm/uaccess.h

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5

arch/arm64/kernel/vmlinux.lds.S

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