Re: [PATCH v4 07/12] arm64: BTI: Decode BYTPE bits when printing PSTATE
From: Catalin Marinas <catalin.marinas@arm.com>
Date: 2020-01-14 17:34:40
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On Wed, Dec 11, 2019 at 03:42:01PM +0000, Mark Brown wrote:
From: Dave Martin <Dave.Martin@arm.com>
The current code to print PSTATE symbolically when generating
backtraces etc., does not include the BYTPE field used by Branch
Target Identification.
So, decode BYTPE and print it too.
In the interests of human-readability, print the classes of BTI
matched. The symbolic notation, BYTPE (PSTATE[11:10]) and
permitted classes of subsequent instruction are:
-- (BTYPE=0b00): any insn
jc (BTYPE=0b01): BTI jc, BTI j, BTI c, PACIxSP
-c (BYTPE=0b10): BTI jc, BTI c, PACIxSP
j- (BTYPE=0b11): BTI jc, BTI j
Signed-off-by: Dave Martin <Dave.Martin@arm.com>
Signed-off-by: Mark Brown <broonie@kernel.org>Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel