Commit 47d67e4d authored by Mark Brown's avatar Mark Brown Committed by Will Deacon
Browse files

arm64: insn: Report PAC and BTI instructions as skippable 



The PAC and BTI instructions can be safely skipped so report them as
such, allowing them to be probed.

Signed-off-by: default avatarMark Brown <broonie@kernel.org>
Acked-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
Acked-by: default avatarMark Rutland <mark.rutland@arm.com>
Link: https://lore.kernel.org/r/20200504131326.18290-5-broonie@kernel.org


Signed-off-by: default avatarWill Deacon <will@kernel.org>
parent c71052cc

arch/arm64/kernel/insn.c

+17 −0
Original line number Diff line number Diff line
@@ -57,6 +57,23 @@ bool __kprobes aarch64_insn_is_steppable_hint(u32 insn) 
		return false;



	switch (insn & 0xFE0) {

	case AARCH64_INSN_HINT_XPACLRI:

	case AARCH64_INSN_HINT_PACIA_1716:

	case AARCH64_INSN_HINT_PACIB_1716:

	case AARCH64_INSN_HINT_AUTIA_1716:

	case AARCH64_INSN_HINT_AUTIB_1716:

	case AARCH64_INSN_HINT_PACIAZ:

	case AARCH64_INSN_HINT_PACIASP:

	case AARCH64_INSN_HINT_PACIBZ:

	case AARCH64_INSN_HINT_PACIBSP:

	case AARCH64_INSN_HINT_AUTIAZ:

	case AARCH64_INSN_HINT_AUTIASP:

	case AARCH64_INSN_HINT_AUTIBZ:

	case AARCH64_INSN_HINT_AUTIBSP:

	case AARCH64_INSN_HINT_BTI:

	case AARCH64_INSN_HINT_BTIC:

	case AARCH64_INSN_HINT_BTIJ:

	case AARCH64_INSN_HINT_BTIJC:

	case AARCH64_INSN_HINT_NOP:

		return true;

	default:

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