Commit 413d3ea6 authored Jun 15, 2020 by Will Deacon

arm64: traps: Dump registers prior to panic() in bad_mode()

When panicing due to an unknown/unhandled exception at EL1, dump the
registers of the faulting context so that it's easier to figure out
what went wrong. In particular, this makes it a lot easier to debug
in-kernel BTI failures since it pretty-prints PSTATE.BTYPE in the crash
log.

Cc: Mark Brown <broonie@kernel.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Link: https://lore.kernel.org/r/20200615113458.2884-1-will@kernel.org

Signed-off-by: Will Deacon <will@kernel.org>

parent 1e570f51

arch/arm64/kernel/traps.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -813,6 +813,7 @@ asmlinkage void bad_mode(struct pt_regs *regs, int reason, unsigned int esr)
		handler[reason], smp_processor_id(), esr,
		esr_get_class_string(esr));

		__show_regs(regs);
		local_daif_mask();
		panic("bad mode");
		}

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