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objtool/LoongArch: Mark types based on break immediate code

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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.

Cc: stable@vger.kernel.org
Suggested-by: WANG Rui <wangrui@loongson.cn>
Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
This commit is contained in:
Tiezhu Yang
2025-09-18 19:43:36 +08:00
committed by Huacai Chen
parent f83ec76bf2
commit baad7830ee
1 changed files with 9 additions and 3 deletions
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12
tools/objtool/arch/loongarch/decode.c
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@@ -310,10 +310,16 @@ int arch_decode_instruction(struct objtool_file *file, const struct section *sec
if (decode_insn_reg2i16_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 */