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[0/3] arm64 sigreturn unwinding fixes

Message ID 20200519121818.14511-1-will@kernel.org (mailing list archive)
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Series arm64 sigreturn unwinding fixes | expand

Message

Will Deacon May 19, 2020, 12:18 p.m. UTC 
Hi folks,

Here are a handful of sigreturn unwinding fixes, based on top of for-next/bti.
Note that I haven't confirmed the GDB breakage, I only spotted it by reading
the code.

Daniel, Tamas: please can you confirm that these fix your unwinding issues with
LLVM?

Given that this has always been broken and there's a risk of introducing
a new regression, I plan to queue these for 5.8 so that we can revert
bits if necessary.

Thanks,

Will

Cc: Dave Martin <dave.martin@arm.com>
Cc: Tamas Zsoldos <tamas.zsoldos@arm.com> 
Cc: Daniel Kiss <daniel.kiss@arm.com>
Cc: Mark Brown <broonie@kernel.org>
Cc: <kernel-team@android.com>

--->8

Will Deacon (3):
  arm64: vdso: Don't prefix sigreturn trampoline with a BTI C
    instruction
  arm64: vdso: Add a comment to justify the mysterious NOP in sigreturn
  arm64: vdso: Fix CFI directives in sigreturn trampoline

 arch/arm64/kernel/vdso/sigreturn.S | 20 +++++++++++++++-----
 1 file changed, 15 insertions(+), 5 deletions(-)