From patchwork Wed Nov 8 04:04:47 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: WANG Rui X-Patchwork-Id: 13449543 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id BB5DEC4332F for ; Wed, 8 Nov 2023 04:05:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229586AbjKHEFh (ORCPT ); Tue, 7 Nov 2023 23:05:37 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46414 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229449AbjKHEFg (ORCPT ); Tue, 7 Nov 2023 23:05:36 -0500 Received: from mail.loongson.cn (mail.loongson.cn [114.242.206.163]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 20E6610D8; Tue, 7 Nov 2023 20:05:32 -0800 (PST) Received: from loongson.cn (unknown [112.22.233.25]) by gateway (Coremail) with SMTP id _____8DxRvEJCUtlOOw3AA--.44432S3; Wed, 08 Nov 2023 12:05:29 +0800 (CST) Received: from localhost.localdomain (unknown [112.22.233.25]) by localhost.localdomain (Coremail) with SMTP id AQAAf8BxL90ECUtleMA7AA--.1906S2; Wed, 08 Nov 2023 12:05:27 +0800 (CST) From: WANG Rui To: Huacai Chen Cc: WANG Xuerui , Xi Ruoyao , linux-kernel@vger.kernel.org, loongarch@lists.linux.dev, linux-kbuild@vger.kernel.org, llvm@lists.linux.dev, loongson-kernel@lists.loongnix.cn, WANG Rui Subject: [PATCH] LoongArch: Disable module from accessing external data directly Date: Wed, 8 Nov 2023 12:04:47 +0800 Message-ID: <20231108040447.288870-1-wangrui@loongson.cn> X-Mailer: git-send-email 2.42.0 MIME-Version: 1.0 X-CM-TRANSID: AQAAf8BxL90ECUtleMA7AA--.1906S2 X-CM-SenderInfo: pzdqw2txl6z05rqj20fqof0/ X-Coremail-Antispam: 1Uk129KBj93XoW7Gry5XFWxCw47CrW7ArW3twc_yoW8JF17pF Z7ur1DGws5ur4vvFnFyFWxXa90yr4DJr4fZa4Ikr45ZFW3uryFvw4Fyrs0g3W2kw4kX34x Ww4fCF9rtFW5JwbCm3ZEXasCq-sJn29KB7ZKAUJUUUU8529EdanIXcx71UUUUU7KY7ZEXa sCq-sGcSsGvfJ3Ic02F40EFcxC0VAKzVAqx4xG6I80ebIjqfuFe4nvWSU5nxnvy29KBjDU 0xBIdaVrnRJUUUkFb4IE77IF4wAFF20E14v26r1j6r4UM7CY07I20VC2zVCF04k26cxKx2 IYs7xG6rWj6s0DM7CIcVAFz4kK6r106r15M28lY4IEw2IIxxk0rwA2F7IY1VAKz4vEj48v e4kI8wA2z4x0Y4vE2Ix0cI8IcVAFwI0_JFI_Gr1l84ACjcxK6xIIjxv20xvEc7CjxVAFwI 0_Jr0_Gr1l84ACjcxK6I8E87Iv67AKxVW8Jr0_Cr1UM28EF7xvwVC2z280aVCY1x0267AK xVW8Jr0_Cr1UM2AIxVAIcxkEcVAq07x20xvEncxIr21l57IF6xkI12xvs2x26I8E6xACxx 1l5I8CrVACY4xI64kE6c02F40Ex7xfMcIj6xIIjxv20xvE14v26r106r15McIj6I8E87Iv 67AKxVWUJVW8JwAm72CE4IkC6x0Yz7v_Jr0_Gr1lF7xvr2IYc2Ij64vIr41l42xK82IYc2 Ij64vIr41l4I8I3I0E4IkC6x0Yz7v_Jr0_Gr1lx2IqxVAqx4xG67AKxVWUJVWUGwC20s02 6x8GjcxK67AKxVWUGVWUWwC2zVAF1VAY17CE14v26r1q6r43MIIYrxkI7VAKI48JMIIF0x vE2Ix0cI8IcVAFwI0_Jr0_JF4lIxAIcVC0I7IYx2IY6xkF7I0E14v26r1j6r4UMIIF0xvE 42xK8VAvwI8IcIk0rVWUJVWUCwCI42IY6I8E87Iv67AKxVWUJVW8JwCI42IY6I8E87Iv6x kF7I0E14v26r1j6r4UYxBIdaVFxhVjvjDU0xZFpf9x07URa0PUUUUU= Precedence: bulk List-ID: X-Mailing-List: linux-kbuild@vger.kernel.org The distance between vmlinux and the module is too far so that PC-REL cannot be accessed directly, only GOT. When compiling module with GCC, the option `-mdirect-extern-access` is disabled by default. The Clang option `-fdirect-access-external-data` is enabled by default, so it needs to be explicitly disabled. Signed-off-by: WANG Rui --- arch/loongarch/Makefile | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/loongarch/Makefile b/arch/loongarch/Makefile index b86f2ff31659..9eeb0c05f3f4 100644 --- a/arch/loongarch/Makefile +++ b/arch/loongarch/Makefile @@ -68,6 +68,8 @@ LDFLAGS_vmlinux += -static -n -nostdlib ifdef CONFIG_AS_HAS_EXPLICIT_RELOCS cflags-y += $(call cc-option,-mexplicit-relocs) KBUILD_CFLAGS_KERNEL += $(call cc-option,-mdirect-extern-access) +KBUILD_AFLAGS_MODULE += $(call cc-option,-fno-direct-access-external-data) +KBUILD_CFLAGS_MODULE += $(call cc-option,-fno-direct-access-external-data) KBUILD_AFLAGS_MODULE += $(call cc-option,-mno-relax) $(call cc-option,-Wa$(comma)-mno-relax) KBUILD_CFLAGS_MODULE += $(call cc-option,-mno-relax) $(call cc-option,-Wa$(comma)-mno-relax) else