[RFC PATCH 15/17] objtool: arm64: Handle supported relocations in alternatives
From: Julien Thierry <hidden>
Date: 2021-01-20 19:13:21
Also in:
linux-efi, linux-hardening, lkml
Subsystem:
objtool, the rest · Maintainers:
Josh Poimboeuf, Peter Zijlstra, Linus Torvalds
Based on get_alt_insn() in arch/arm64/kernel/alternative.c, arm64 alternative code adapts offsets for static branches and adrp instructions. Signed-off-by: Julien Thierry <redacted> --- tools/objtool/arch/arm64/special.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/tools/objtool/arch/arm64/special.c b/tools/objtool/arch/arm64/special.c
index c9c3e0bfd581..d47e5590ed60 100644
--- a/tools/objtool/arch/arm64/special.c
+++ b/tools/objtool/arch/arm64/special.c@@ -30,7 +30,11 @@ bool arch_support_alt_relocation(struct special_alt *special_alt, struct instruction *insn, struct reloc *reloc) { - return false; + u32 opcode = *(u32 *)(insn->sec->data->d_buf + insn->offset); + + return aarch64_insn_is_branch_imm(opcode) || + aarch64_insn_is_adrp(opcode) || + !aarch64_insn_uses_literal(opcode); } static struct section *get_switch_table_info_section(struct objtool_file *file)
--
2.25.4
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