From nobody Sat Nov 23 18:58:00 2024 Received: from mail.loongson.cn (mail.loongson.cn [114.242.206.163]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 18C5016130B for ; Fri, 22 Nov 2024 04:50:28 +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=1732251031; cv=none; b=KppAihdqU4uaWQTQTRxyoEYHSVqIF1SK5TGxsgvS/mrMYnlhrtiOq+3p7BfVj572QgCjziNUg/zMJSQHVnvIf6qwTRfPCATMLLF3yZISRbW6TG/J21Vsfo6T+PYVY/WP+L9HYrV0HHQg/8e17yqBQG1P16fElaWaaYx9kRKG9Ug= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1732251031; c=relaxed/simple; bh=c0YOBx3w5JSgJYW2hQNaJGpMTxwwOSL9sdUCHCSGEdA=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=XkX4u7hw2VmmAxuNgilyrtPUtvxKbKcZ7bpIeCmOV0b+17EX8DQGXYGz6sNu1dGpwn47vGvae0FZgkc4ANU4PZfDcDHpXdXm2jDY3p2Pf77G+uIirx/CDYBYx8NZTM/aYGNC2frtAQ+6YmmvugPMxEEXeUQnLeEWm3W+7yWypKk= 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 _____8BxuuGNDUBnA71FAA--.7777S3; Fri, 22 Nov 2024 12:50:21 +0800 (CST) Received: from linux.localdomain (unknown [113.200.148.30]) by front1 (Coremail) with SMTP id qMiowMCxdcCIDUBnIJJiAA--.33733S7; Fri, 22 Nov 2024 12:50:20 +0800 (CST) From: Tiezhu Yang To: Huacai Chen , Josh Poimboeuf , Peter Zijlstra Cc: loongarch@lists.linux.dev, linux-kernel@vger.kernel.org Subject: [PATCH v4 05/10] objtool: Handle unreachable entry of rodata Date: Fri, 22 Nov 2024 12:50:00 +0800 Message-ID: <20241122045005.14617-6-yangtiezhu@loongson.cn> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20241122045005.14617-1-yangtiezhu@loongson.cn> References: <20241122045005.14617-1-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: qMiowMCxdcCIDUBnIJJiAA--.33733S7 X-CM-SenderInfo: p1dqw3xlh2x3gn0dqz5rrqw2lrqou0/ X-Coremail-Antispam: 1Uk129KBj93XoW7Kry8Jw4xGr18ZF13XF15WrX_yoW8JF47pF n8Ww4jkr4vqryIk3ZrKa10gry3Gan7Gry8Jr92yr4UA3sxXrn8tFWSka1avay5Wa1ru3WI vFWY9rWUuF4qyagCm3ZEXasCq-sJn29KB7ZKAUJUUUUr529EdanIXcx71UUUUU7KY7ZEXa sCq-sGcSsGvfJ3Ic02F40EFcxC0VAKzVAqx4xG6I80ebIjqfuFe4nvWSU5nxnvy29KBjDU 0xBIdaVrnRJUUU9Yb4IE77IF4wAFF20E14v26r1j6r4UM7CY07I20VC2zVCF04k26cxKx2 IYs7xG6rWj6s0DM7CIcVAFz4kK6r106r15M28lY4IEw2IIxxk0rwA2F7IY1VAKz4vEj48v e4kI8wA2z4x0Y4vE2Ix0cI8IcVAFwI0_Xr0_Ar1l84ACjcxK6xIIjxv20xvEc7CjxVAFwI 0_Gr0_Cr1l84ACjcxK6I8E87Iv67AKxVWxJVW8Jr1l84ACjcxK6I8E87Iv6xkF7I0E14v2 6r4UJVWxJr1ln4kS14v26r1Y6r17M2AIxVAIcxkEcVAq07x20xvEncxIr21l57IF6xkI12 xvs2x26I8E6xACxx1l5I8CrVACY4xI64kE6c02F40Ex7xfMcIj6xIIjxv20xvE14v26r1q 6rW5McIj6I8E87Iv67AKxVW8JVWxJwAm72CE4IkC6x0Yz7v_Jr0_Gr1lF7xvr2IYc2Ij64 vIr41l42xK82IYc2Ij64vIr41l4I8I3I0E4IkC6x0Yz7v_Jr0_Gr1l4IxYO2xFxVAFwI0_ Jrv_JF1lx2IqxVAqx4xG67AKxVWUJVWUGwC20s026x8GjcxK67AKxVWUGVWUWwC2zVAF1V AY17CE14v26r126r1DMIIYrxkI7VAKI48JMIIF0xvE2Ix0cI8IcVAFwI0_Xr0_Ar1lIxAI cVC0I7IYx2IY6xkF7I0E14v26r4j6F4UMIIF0xvE42xK8VAvwI8IcIk0rVWUJVWUCwCI42 IY6I8E87Iv67AKxVW8JVWxJwCI42IY6I8E87Iv6xkF7I0E14v26r4j6r4UJbIYCTnIWIev Ja73UjIFyTuYvjxU4miiDUUUU Content-Type: text/plain; charset="utf-8" When compling with Clang on LoongArch, there exists unreachable entry of rodata which points to a position 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 | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/tools/objtool/check.c b/tools/objtool/check.c index 8733ca620cca..b21e47d8d3d1 100644 --- a/tools/objtool/check.c +++ b/tools/objtool/check.c @@ -2144,6 +2144,13 @@ 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 && + (!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