From nobody Sat Nov 23 17:59:18 2024 Received: from mail.loongson.cn (mail.loongson.cn [114.242.206.163]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 5B9F7196C7C for ; Tue, 19 Nov 2024 06:57:04 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=114.242.206.163 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1731999426; cv=none; b=FY9Cd2fZtDgsdbbdjg6gkSe2fRz9DbWX9ybZGglfl41JRKYsUEv+KHPPbljMZsbWOg6kwWCw/gcsnYTBZsdb8PGIVY6/UEgn6GGEt/Ee9SZ3TWP/DkYJH8QtQRlcYkltRm7Ngv19enKigKqIJ8SGuv1OheGoEaRNnQ9GKmaIYBw= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1731999426; c=relaxed/simple; bh=8CsAovR9lMqzsmgDzKH54S5fZfVLlqjCVo2k+HhbfJ4=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=S0RwE0T8OzqAYKBv2wqBeF/iqPvkNyH+VworNBcGxMyaKI//SBfsA9QfpBGy5q3LUauiuj+9fvHPB1bFpFpPOkUM4wJuHJE3D2uJfKhaUKFxZUgGPj+RPbcKwLhbrVMGctwY9W+U4MhPW912SJ5fuFQp8zey6jEzSCkHkMxk2lo= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=loongson.cn; spf=pass smtp.mailfrom=loongson.cn; arc=none smtp.client-ip=114.242.206.163 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=loongson.cn Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=loongson.cn Received: from loongson.cn (unknown [113.200.148.30]) by gateway (Coremail) with SMTP id _____8AxLOK+NjxnaTZCAA--.63917S3; Tue, 19 Nov 2024 14:57:02 +0800 (CST) Received: from linux.localdomain (unknown [113.200.148.30]) by front1 (Coremail) with SMTP id qMiowMCxDuG4NjxnB_5cAA--.5437S7; Tue, 19 Nov 2024 14:57:02 +0800 (CST) From: Tiezhu Yang To: Huacai Chen , Josh Poimboeuf , Peter Zijlstra Cc: loongarch@lists.linux.dev, linux-kernel@vger.kernel.org Subject: [PATCH v3 05/10] objtool: Handle unreachable entry of rodata Date: Tue, 19 Nov 2024 14:56:50 +0800 Message-ID: <20241119065655.21123-6-yangtiezhu@loongson.cn> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20241119065655.21123-1-yangtiezhu@loongson.cn> References: <20241119065655.21123-1-yangtiezhu@loongson.cn> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-CM-TRANSID: qMiowMCxDuG4NjxnB_5cAA--.5437S7 X-CM-SenderInfo: p1dqw3xlh2x3gn0dqz5rrqw2lrqou0/ X-Coremail-Antispam: 1Uk129KBj93XoW7uw47ArW8WFy5Gry3AF1fGrX_yoW8Jw1kpF n8u3yjkr4jgryxu3ZrGa10grW3Ga1xGrWkJr92yr45K3sxXrn0qFWSka1ava15Wa1ru3WI vFWYg34UuF4qyagCm3ZEXasCq-sJn29KB7ZKAUJUUUUr529EdanIXcx71UUUUU7KY7ZEXa sCq-sGcSsGvfJ3Ic02F40EFcxC0VAKzVAqx4xG6I80ebIjqfuFe4nvWSU5nxnvy29KBjDU 0xBIdaVrnRJUUU9Fb4IE77IF4wAFF20E14v26r1j6r4UM7CY07I20VC2zVCF04k26cxKx2 IYs7xG6rWj6s0DM7CIcVAFz4kK6r106r15M28lY4IEw2IIxxk0rwA2F7IY1VAKz4vEj48v e4kI8wA2z4x0Y4vE2Ix0cI8IcVAFwI0_Xr0_Ar1l84ACjcxK6xIIjxv20xvEc7CjxVAFwI 0_Gr0_Cr1l84ACjcxK6I8E87Iv67AKxVW8Jr0_Cr1UM28EF7xvwVC2z280aVCY1x0267AK xVW8Jr0_Cr1UM2kKe7AKxVWUXVWUAwAS0I0E0xvYzxvE52x082IY62kv0487Mc804VCY07 AIYIkI8VC2zVCFFI0UMc02F40EFcxC0VAKzVAqx4xG6I80ewAv7VC0I7IYx2IY67AKxVWU tVWrXwAv7VC2z280aVAFwI0_Gr0_Cr1lOx8S6xCaFVCjc4AY6r1j6r4UM4x0Y48IcxkI7V AKI48JMxAIw28IcxkI7VAKI48JMxC20s026xCaFVCjc4AY6r1j6r4UMxCIbckI1I0E14v2 6r1Y6r17MI8I3I0E5I8CrVAFwI0_Jr0_Jr4lx2IqxVCjr7xvwVAFwI0_JrI_JrWlx4CE17 CEb7AF67AKxVWUAVWUtwCIc40Y0x0EwIxGrwCI42IY6xIIjxv20xvE14v26ryj6F1UMIIF 0xvE2Ix0cI8IcVCY1x0267AKxVW8JVWxJwCI42IY6xAIw20EY4v20xvaj40_Jr0_JF4lIx AIcVC2z280aVAFwI0_Gr0_Cr1lIxAIcVC2z280aVCY1x0267AKxVW8JVW8JrUvcSsGvfC2 KfnxnUUI43ZEXa7IU8N6pPUUUUU== Content-Type: text/plain; charset="utf-8" When compling with Clang on LoongArch, there exists unreachable entry of rodata which points to a nop instruction after the function return instruction, this is generated by compiler to fill the non-existent switch case, just skip the entry when parsing the relocation section of rodata. This is preparation for later patch on LoongArch, there is no effect for the other archs with this patch. Signed-off-by: Tiezhu Yang --- tools/objtool/check.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/tools/objtool/check.c b/tools/objtool/check.c index eb4c89501493..17df3738e087 100644 --- a/tools/objtool/check.c +++ b/tools/objtool/check.c @@ -2136,6 +2136,14 @@ static int add_jump_table(struct objtool_file *file,= struct instruction *insn, if (!dest_insn) break; =20 + /* Handle the special cases compiled with Clang on LoongArch */ + if (file->elf->ehdr.e_machine =3D=3D EM_LOONGARCH && + reloc->sym->type =3D=3D STT_SECTION && dest_insn->type =3D=3D INSN_N= OP && + (!insn_func(dest_insn) || insn_func(dest_insn)->pfunc !=3D pfunc)) { + prev_offset =3D reloc_offset(reloc); + continue; + } + /* Make sure the destination is in the same function: */ if (!insn_func(dest_insn) || insn_func(dest_insn)->pfunc !=3D pfunc) break; --=20 2.42.0