MIPS: properly stop .eh_frame generation

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[ Upstream commit 894ef53001 ]

Commit 866b6a89c6 ("MIPS: Add DWARF unwinding to assembly") added
-fno-asynchronous-unwind-tables to KBUILD_CFLAGS to prevent compiler
from emitting .eh_frame symbols.
However, as MIPS heavily uses CFI, that's not enough. Use the
approach taken for x86 (as it also uses CFI) and explicitly put CFI
symbols into the .debug_frame section (except for VDSO).
This allows us to drop .eh_frame from DISCARDS as it's no longer
being generated.

Fixes: 866b6a89c6 ("MIPS: Add DWARF unwinding to assembly")
Suggested-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Alexander Lobakin <alobakin@pm.me>
Reviewed-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Alexander Lobakin 2021-01-10 11:56:28 +00:00 • committed by Greg Kroah-Hartman

parent b1f4731f33

commit f89de444df

2 changed files with 18 additions and 1 deletions

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18

arch/mips/include/asm/asm.h

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1

arch/mips/kernel/vmlinux.lds.S

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