[PATCH v6 04/33] objtool: arm64: Decode jump and call related instructions
From: Chen Zhongjin <hidden>
Date: 2022-06-23 01:52:29
Also in:
linux-arch, linux-arm-kernel, linux-kbuild, live-patching, lkml
Subsystem:
objtool, the rest · Maintainers:
Josh Poimboeuf, Peter Zijlstra, Linus Torvalds
Decode branch, branch and link (aarch64's call) and return instructions. Signed-off-by: Julien Thierry <redacted> Signed-off-by: Chen Zhongjin <redacted> --- tools/objtool/arch/arm64/decode.c | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+)
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; }
--
2.17.1