linux-kernel - [PATCH v2 2/2] objtool/LoongArch: Mark types based on break immediate code

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Message-ID: <20250916122516.21013-3-yangtiezhu@loongson.cn>
Date: Tue, 16 Sep 2025 20:25:15 +0800
From: Tiezhu Yang <yangtiezhu@...ngson.cn>
To: Huacai Chen <chenhuacai@...nel.org>,
	Miguel Ojeda <ojeda@...nel.org>,
	Josh Poimboeuf <jpoimboe@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>
Cc: WANG Rui <wangrui@...ngson.cn>,
	rust-for-linux@...r.kernel.org,
	loongarch@...ts.linux.dev,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2 2/2] objtool/LoongArch: Mark types based on break immediate code

If the break immediate code is 0, it should mark the type
as INSN_TRAP. If the break immediate code is 1, it should
mark the type as INSN_BUG.

While at it, format the code style and add the code comment
for nop.

Suggested-by: WANG Rui <wangrui@...ngson.cn>
Signed-off-by: Tiezhu Yang <yangtiezhu@...ngson.cn>
---
 tools/objtool/arch/loongarch/decode.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/tools/objtool/arch/loongarch/decode.c b/tools/objtool/arch/loongarch/decode.c
index 707f339b1840..2e555c4060c5 100644
--- a/tools/objtool/arch/loongarch/decode.c
+++ b/tools/objtool/arch/loongarch/decode.c
@@ -331,10 +331,16 @@ int arch_decode_instruction(struct objtool_file *file, const struct section *sec
 	if (decode_insn_reg3_fomat(inst, insn))
 		return 0;
 
-	if (inst.word == 0)
+	if (inst.word == 0) {
+		/* andi $zero, $zero, 0x0 */
 		insn->type = INSN_NOP;
-	else if (inst.reg0i15_format.opcode == break_op) {
-		/* break */
+	} else if (inst.reg0i15_format.opcode == break_op &&
+		   inst.reg0i15_format.immediate == 0x0) {
+		/* break 0x0 */
+		insn->type = INSN_TRAP;
+	} else if (inst.reg0i15_format.opcode == break_op &&
+		   inst.reg0i15_format.immediate == 0x1) {
+		/* break 0x1 */
 		insn->type = INSN_BUG;
 	} else if (inst.reg2_format.opcode == ertn_op) {
 		/* ertn */
-- 
2.42.0