[RFC PATCH v2 06/13] objtool: arm64: Decode jump and call related instructions
From: Julien Thierry <hidden>
Date: 2021-03-03 19:29:23
Also in:
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> --- tools/objtool/arch/arm64/decode.c | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+)
diff --git a/tools/objtool/arch/arm64/decode.c b/tools/objtool/arch/arm64/decode.c
index 54eeb8704a42..983f16b8b2af 100644
--- a/tools/objtool/arch/arm64/decode.c
+++ b/tools/objtool/arch/arm64/decode.c@@ -215,6 +215,28 @@ int arch_decode_instruction(const struct elf *elf, const struct section *sec, } *type = INSN_OTHER; 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); + } else { + *type = INSN_OTHER; + } + break; default: *type = INSN_OTHER; break;
--
2.25.4
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