[v5,04/33] objtool: arm64: Decode jump and call related instructions

Commit Message

Chen Zhongjin June 22, 2022, 3:48 p.m. UTC

Decode branch, branch and link (aarch64's call) and return instructions.

Signed-off-by: Julien Thierry <[e-mail]>
Signed-off-by: Chen Zhongjin <[e-mail]>
---
 tools/objtool/arch/arm64/decode.c | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

Patch

diff --git a/tools/objtool/arch/arm64/decode.c b/tools/objtool/arch/arm64/decode.c
index d8c32703874d..40ada17d0842 100644
--- a/tools/objtool/arch/arm64/decode.c
+++ b/tools/objtool/arch/arm64/decode.c
@@ -212,6 +212,27 @@  int arch_decode_instruction(struct objtool_file *file, const struct section *sec
 			}
 		}
 		break;
+	case AARCH64_INSN_CLS_BR_SYS:
+		if (aarch64_insn_is_ret(insn) &&
+		    aarch64_insn_decode_register(AARCH64_INSN_REGTYPE_RN, insn)
+			== AARCH64_INSN_REG_LR) {
+			*type = INSN_RETURN;
+		} else if (aarch64_insn_is_bl(insn)) {
+			*type = INSN_CALL;
+			*immediate = aarch64_get_branch_offset(insn);
+		} else if (aarch64_insn_is_blr(insn)) {
+			*type = INSN_CALL_DYNAMIC;
+		} else if (aarch64_insn_is_b(insn)) {
+			*type = INSN_JUMP_UNCONDITIONAL;
+			*immediate = aarch64_get_branch_offset(insn);
+		} else if (aarch64_insn_is_br(insn)) {
+			*type = INSN_JUMP_DYNAMIC;
+		} else if (aarch64_insn_is_branch_imm(insn)) {
+			/* Remaining branch opcodes are conditional */
+			*type = INSN_JUMP_CONDITIONAL;
+			*immediate = aarch64_get_branch_offset(insn);
+		}
+		break;
 	default:
 		break;
 	}