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Commit a264bf34 authored by Marc Zyngier's avatar Marc Zyngier
Browse files

arm64: insn: Add N immediate encoding 



We're missing the a way to generate the encoding of the N immediate,
which is only a single bit used in a number of instruction that take
an immediate.

Acked-by: default avatarChristoffer Dall <christoffer.dall@linaro.org>
Reviewed-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
Signed-off-by: default avatarMarc Zyngier <marc.zyngier@arm.com>
parent dea5e2a4

arch/arm64/include/asm/insn.h

+1 −0
Original line number Diff line number Diff line
@@ -70,6 +70,7 @@ enum aarch64_insn_imm_type { 
	AARCH64_INSN_IMM_6,

	AARCH64_INSN_IMM_S,

	AARCH64_INSN_IMM_R,

	AARCH64_INSN_IMM_N,

	AARCH64_INSN_IMM_MAX

};

arch/arm64/kernel/insn.c

+4 −0
Original line number Diff line number Diff line
@@ -343,6 +343,10 @@ static int __kprobes aarch64_get_imm_shift_mask(enum aarch64_insn_imm_type type, 
		mask = BIT(6) - 1;

		shift = 16;

		break;

	case AARCH64_INSN_IMM_N:

		mask = 1;

		shift = 22;

		break;

	default:

		return -EINVAL;

	}