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objtool: Handle PC relative relocation type

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When compiling with Clang on LoongArch, there exists 32 bit PC relative
relocation type, it needs to get the offset with "S + A - PC" according
to the spec of "ELF for the LoongArch Architecture".

This is preparation for later patch on LoongArch, there is no effect for
the other archs with this patch.

Link: https://github.com/loongson/la-abi-specs/blob/release/laelf.adoc
Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Signed-off-by: michael <michael5hzg@gmail.com>
Signed-off-by: maoxiaochuan <maoxiaochuan@loongson.cn>
This commit is contained in:
Tiezhu Yang
2025-02-13 14:26:40 +08:00
committed by maoxiaochuan
parent 606869223f
commit e5a48eeb78
1 changed files with 5 additions and 0 deletions
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tools/objtool/check.c
+5
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@@ -2126,6 +2126,11 @@ static int add_jump_table(struct objtool_file *file, struct instruction *insn,
if (reloc->sym->type == STT_SECTION) {
/* Addend field in the relocation entry associated with the symbol */
offset = reloc_addend(reloc);
/* Handle the special cases compiled with Clang on LoongArch */
if (file->elf->ehdr.e_machine == EM_LOONGARCH &&
reloc_type(reloc) == R_LARCH_32_PCREL)
offset = reloc->sym->offset + reloc_addend(reloc) -
(reloc_offset(reloc) - reloc_offset(table));
} else {
/* The address of the symbol in the relocation entry */
offset = reloc->sym->offset;