linux-kernel - [RFC PATCH v4 07/37] objtool: arm64: Decode other system instructions

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Date:   Fri, 29 Apr 2022 17:43:25 +0800
From:   Chen Zhongjin <chenzhongjin@...wei.com>
To:     <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-arch@...r.kernel.org>
CC:     <jthierry@...hat.com>, <catalin.marinas@....com>,
        <will@...nel.org>, <masahiroy@...nel.org>, <jpoimboe@...hat.com>,
        <peterz@...radead.org>, <ycote@...hat.com>,
        <herbert@...dor.apana.org.au>, <mark.rutland@....com>,
        <davem@...emloft.net>, <ardb@...nel.org>, <maz@...nel.org>,
        <tglx@...utronix.de>, <luc.vanoostenryck@...il.com>,
        <chenzhongjin@...wei.com>
Subject: [RFC PATCH v4 07/37] objtool: arm64: Decode other system instructions

From: Julien Thierry <jthierry@...hat.com>

Decode ERET, BRK and NOPs

Signed-off-by: Julien Thierry <jthierry@...hat.com>
---
 tools/objtool/arch/arm64/decode.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/tools/objtool/arch/arm64/decode.c b/tools/objtool/arch/arm64/decode.c
index 351f8b1bbd6d..b07e0f51637e 100644
--- a/tools/objtool/arch/arm64/decode.c
+++ b/tools/objtool/arch/arm64/decode.c
@@ -238,6 +238,13 @@ int arch_decode_instruction(struct objtool_file *file, const struct section *sec
 			/* Remaining branch opcodes are conditional */
 			*type = INSN_JUMP_CONDITIONAL;
 			*immediate = aarch64_get_branch_offset(insn);
+		} else if (aarch64_insn_is_eret(insn)) {
+			*type = INSN_CONTEXT_SWITCH;
+		} else if (aarch64_insn_is_steppable_hint(insn)) {
+			*type = INSN_NOP;
+		} else if (aarch64_insn_is_brk(insn)) {
+			*type = INSN_BUG;
+			*immediate = aarch64_insn_decode_immediate(AARCH64_INSN_IMM_16, insn);
 		}
 		break;
 	default:
-- 
2.17.1