modpost: drop executable ELF support

Since commit 269a535c ("modpost: generate vmlinux.symvers and
reuse it for the second modpost"), modpost only parses relocatable
files (ET_REL).
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>

scripts/mod/modpost.c

@@ -321,9 +321,6 @@ static void *sym_get_data_by_offset(const struct elf_info *info,
 {
 	Elf_Shdr *sechdr = &info->sechdrs[secindex];
 
-	if (info->hdr->e_type != ET_REL)
-		offset -= sechdr->sh_addr;
-
 	return (void *)info->hdr + sechdr->sh_offset + offset;
 }
 
@@ -466,6 +463,10 @@ static int parse_elf(struct elf_info *info, const char *filename)
 	sechdrs = (void *)hdr + hdr->e_shoff;
 	info->sechdrs = sechdrs;
 
+	/* modpost only works for relocatable objects */
+	if (hdr->e_type != ET_REL)
+		fatal("%s: not relocatable object.", filename);
+
 	/* Check if file offset is correct */
 	if (hdr->e_shoff > info->size) {
 		fatal("section header offset=%lu in file '%s' is bigger than filesize=%zu\n",
@@ -1622,9 +1623,6 @@ static int addend_386_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r)
 		break;
 	case R_386_PC32:
 		r->r_addend = TO_NATIVE(*location) + 4;
-		/* For CONFIG_RELOCATABLE=y */
-		if (elf->hdr->e_type == ET_EXEC)
-			r->r_addend += r->r_offset;
 		break;
 	}
 	return 0;