From: Will Deacon <will@kernel.org>
Date: Mon, 15 Jun 2020 11:23:16 +0000 (+0100)
Subject: arm64: traps: Dump registers prior to panic() in bad_mode()
X-Git-Tag: v5.10.7~2044^2~52
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=413d3ea6b775d77b2057f13a9af75875eb066156;p=platform%2Fkernel%2Flinux-rpi.git

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>
---

diff --git a/arch/arm64/kernel/traps.c b/arch/arm64/kernel/traps.c
index 50cc30a..24f2af7 100644
--- a/arch/arm64/kernel/traps.c
+++ b/arch/arm64/kernel/traps.c
@@ -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");
 }