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ARM: efistub: replace adrl pseudo-op with adr_l macro invocation

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commit 67e3f828bd4bf5e4eb4214dc4eb227d8f1c8a877 upstream.

The ARM 'adrl' pseudo instruction is a bit problematic, as it does not
exist in Thumb mode, and it is not implemented by Clang either. Since
the Thumb variant has a slightly bigger range, it is sometimes necessary
to emit the 'adrl' variant in ARM mode where Thumb mode can use adr just
fine. However, that still leaves the Clang issue, which does not appear
to be supporting this any time soon.

So let's switch to the adr_l macro, which works for both ARM and Thumb,
and has unlimited range.

Reviewed-by: Nicolas Pitre <nico@fluxnic.net>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Ard Biesheuvel 2020-09-14 12:28:01 +03:00 committed by Greg Kroah-Hartman
parent fd863653ad
commit d291b2594f
1 changed files with 1 additions and 2 deletions
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3
arch/arm/boot/compressed/head.S
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@ -1440,8 +1440,7 @@ ENTRY(efi_enter_kernel)
mov r4, r0 @ preserve image base
mov r8, r1 @ preserve DT pointer
ARM( adrl r0, call_cache_fn )
THUMB( adr r0, call_cache_fn )
adr_l r0, call_cache_fn
adr r1, 0f @ clean the region of code we
bl cache_clean_flush @ may run with the MMU off