diff mbox series

[RFC,v3,11/13] objtool: arm64: Handle supported relocations in alternatives

Message ID 20220407120141.43801-12-chenzhongjin@huawei.com (mailing list archive)
State New, archived
Headers show
Series objtool: add base support for arm64 | expand

Commit Message

Chen Zhongjin April 7, 2022, 12:01 p.m. UTC 
From: Julien Thierry <jthierry@redhat.com>

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 <jthierry@redhat.com>
---
 tools/objtool/arch/arm64/special.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/tools/objtool/arch/arm64/special.c b/tools/objtool/arch/arm64/special.c
index 45f283283091..a70b91e8bd7d 100644
--- a/tools/objtool/arch/arm64/special.c
+++ b/tools/objtool/arch/arm64/special.c
@@ -10,7 +10,11 @@  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);
 }