Revision - 3b3a371 - x86/debug: Use UD2 for WARN() - origin: https://github.com/torvalds/linux

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27 March 2024, 02:37:15 UTC

Revision 3b3a371cc9bc980429baabe0a8e5f307f3d1f463 authored by Peter Zijlstra on 09 February 2018, 12:16:59 UTC, committed by Ingo Molnar on 15 February 2018, 00:15:50 UTC

x86/debug: Use UD2 for WARN()

Since the Intel SDM added an ModR/M byte to UD0 and binutils followed
that specification, we now cannot disassemble our kernel anymore.

This now means Intel and AMD disagree on the encoding of UD0. And instead
of playing games with additional bytes that are valid ModR/M and single
byte instructions (0xd6 for instance), simply use UD2 for both WARN() and
BUG().

Requested-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Arjan van de Ven <arjan@linux.intel.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20180208194406.GD25181@hirez.programming.kicks-ass.net
Signed-off-by: Ingo Molnar <mingo@kernel.org>

1 parent 2b5db66

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Tip revision: 3b3a371cc9bc980429baabe0a8e5f307f3d1f463 authored by Peter Zijlstra on 09 February 2018, 12:16:59 UTC
x86/debug: Use UD2 for WARN()

Tip revision: 3b3a371

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x86/debug: Use UD2 for WARN()

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