From patchwork Mon Jan 4 12:42:52 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shuo Wang X-Patchwork-Id: 41624 Return-Path: X-Original-To: patchwork@sourceware.org Delivered-To: patchwork@sourceware.org Received: from server2.sourceware.org (localhost [IPv6:::1]) by sourceware.org (Postfix) with ESMTP id 88CB73870913; Mon, 4 Jan 2021 12:43:10 +0000 (GMT) X-Original-To: libc-alpha@sourceware.org Delivered-To: libc-alpha@sourceware.org Received: from szxga07-in.huawei.com (szxga07-in.huawei.com [45.249.212.35]) by sourceware.org (Postfix) with ESMTPS id 6B0CB38618BD for ; Mon, 4 Jan 2021 12:43:06 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.3.2 sourceware.org 6B0CB38618BD Authentication-Results: sourceware.org; dmarc=none (p=none dis=none) header.from=huawei.com Authentication-Results: sourceware.org; spf=pass smtp.mailfrom=wangshuo47@huawei.com Received: from DGGEMS410-HUB.china.huawei.com (unknown [172.30.72.58]) by szxga07-in.huawei.com (SkyGuard) with ESMTP id 4D8ZyT6htsz7Q5L; Mon, 4 Jan 2021 20:42:09 +0800 (CST) Received: from huawei.com (10.174.176.87) by DGGEMS410-HUB.china.huawei.com (10.3.19.210) with Microsoft SMTP Server id 14.3.498.0; Mon, 4 Jan 2021 20:42:53 +0800 From: Shuo Wang To: , , Subject: [PATCH] aarch64: fix stack missing after sp is updated Date: Mon, 4 Jan 2021 20:42:52 +0800 Message-ID: <20210104124252.16664-1-wangshuo47@huawei.com> X-Mailer: git-send-email 2.19.0.windows.1 MIME-Version: 1.0 X-Originating-IP: [10.174.176.87] X-CFilter-Loop: Reflected X-Spam-Status: No, score=-12.8 required=5.0 tests=BAYES_00, GIT_PATCH_0, KAM_DMARC_STATUS, RCVD_IN_MSPIKE_H4, RCVD_IN_MSPIKE_WL, SPF_HELO_NONE, SPF_PASS, TXREP autolearn=ham autolearn_force=no version=3.4.2 X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: hushiyuan@huawei.com Errors-To: libc-alpha-bounces@sourceware.org Sender: "Libc-alpha" After sp is updated, the CFA offset should be set before next instruction. Tested in glibc-2.28: Thread 2 "xxxxxxx" hit Breakpoint 1, _dl_tlsdesc_dynamic () at ../sysdeps/aarch64/dl-tlsdesc.S:149 149 stp x1, x2, [sp, #-32]! Missing separate debuginfos, use: dnf debuginfo-install libgcc-7.3.0-20190804.h24.aarch64 (gdb) bt #0 _dl_tlsdesc_dynamic () at ../sysdeps/aarch64/dl-tlsdesc.S:149 #1 0x0000ffffbe4fbb44 in OurFunction (threadId=3194870184) at /home/test/test_function.c:30 #2 0x0000000000400c08 in initaaa () at thread.c:58 #3 0x0000000000400c50 in thread_proc (param=0x0) at thread.c:71 #4 0x0000ffffbf6918bc in start_thread (arg=0xfffffffff29f) at pthread_create.c:486 #5 0x0000ffffbf5669ec in thread_start () at ../sysdeps/unix/sysv/linux/aarch64/clone.S:78 (gdb) ni _dl_tlsdesc_dynamic () at ../sysdeps/aarch64/dl-tlsdesc.S:150 150 stp x3, x4, [sp, #16] (gdb) bt #0 _dl_tlsdesc_dynamic () at ../sysdeps/aarch64/dl-tlsdesc.S:150 #1 0x0000ffffbe4fbb44 in OurFunction (threadId=3194870184) at /home/test/test_function.c:30 #2 0x0000000000000000 in ?? () Backtrace stopped: previous frame identical to this frame (corrupt stack?) (gdb) ni _dl_tlsdesc_dynamic () at ../sysdeps/aarch64/dl-tlsdesc.S:157 157 mrs x4, tpidr_el0 (gdb) bt #0 _dl_tlsdesc_dynamic () at ../sysdeps/aarch64/dl-tlsdesc.S:157 #1 0x0000ffffbe4fbb44 in OurFunction (threadId=3194870184) at /home/test/test_function.c:30 #2 0x0000000000400c08 in initaaa () at thread.c:58 #3 0x0000000000400c50 in thread_proc (param=0x0) at thread.c:71 #4 0x0000ffffbf6918bc in start_thread (arg=0xfffffffff29f) at pthread_create.c:486 #5 0x0000ffffbf5669ec in thread_start () at ../sysdeps/unix/sysv/linux/aarch64/clone.S:78 Signed-off-by: liqingqing Signed-off-by: Shuo Wang --- sysdeps/aarch64/dl-tlsdesc.S | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/sysdeps/aarch64/dl-tlsdesc.S b/sysdeps/aarch64/dl-tlsdesc.S index 0046d29f9b..425e45a50f 100644 --- a/sysdeps/aarch64/dl-tlsdesc.S +++ b/sysdeps/aarch64/dl-tlsdesc.S @@ -150,8 +150,8 @@ _dl_tlsdesc_dynamic: /* Save just enough registers to support fast path, if we fall into slow path we will save additional registers. */ stp x1, x2, [sp, #-32]! - stp x3, x4, [sp, #16] cfi_adjust_cfa_offset (32) + stp x3, x4, [sp, #16] cfi_rel_offset (x1, 0) cfi_rel_offset (x2, 8) cfi_rel_offset (x3, 16)