From patchwork Mon Feb 10 16:10:15 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kevin Wolf X-Patchwork-Id: 13968184 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 lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id A40F4C02198 for ; Mon, 10 Feb 2025 16:16:07 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1thWNg-0006cl-0y; Mon, 10 Feb 2025 11:11:34 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1thWNM-0006Tm-Il for qemu-devel@nongnu.org; Mon, 10 Feb 2025 11:11:17 -0500 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1thWNI-0000zX-2h for qemu-devel@nongnu.org; Mon, 10 Feb 2025 11:11:12 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1739203865; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=KTvvyJV51yKmE4CVU0pXnpzRX1iwCAAQnLunpxMEj1g=; b=db5brUxfLo/5sOS8fT7ceG/DLMmsi4ZgxhGN+tKFFJ+72Ut2hhHSKvJceE0jlTzQRAZPYC ucgRG/Bj405Za4aiu0KiLGYBjMw4MVLZkD8MNWGxBqczh7BP+edvTLd5AgvoExMiXZLGda V3JkYtH+XNvW7xQOptw0qhmZhBUUqGY= Received: from mx-prod-mc-08.mail-002.prod.us-west-2.aws.redhat.com (ec2-35-165-154-97.us-west-2.compute.amazonaws.com [35.165.154.97]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-580-zoyOfZJ4M9CVnacaZuJfIQ-1; Mon, 10 Feb 2025 11:11:03 -0500 X-MC-Unique: zoyOfZJ4M9CVnacaZuJfIQ-1 X-Mimecast-MFC-AGG-ID: zoyOfZJ4M9CVnacaZuJfIQ Received: from mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.17]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-08.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id C233A1800879; Mon, 10 Feb 2025 16:11:02 +0000 (UTC) Received: from merkur.fritz.box (unknown [10.45.225.156]) by mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 7C77B195608D; Mon, 10 Feb 2025 16:11:01 +0000 (UTC) From: Kevin Wolf To: qemu-block@nongnu.org Cc: kwolf@redhat.com, qemu-devel@nongnu.org Subject: [PULL 06/25] scripts/qemu-gdb: Simplify fs_base fetching for coroutines Date: Mon, 10 Feb 2025 17:10:15 +0100 Message-ID: <20250210161034.76494-7-kwolf@redhat.com> In-Reply-To: <20250210161034.76494-1-kwolf@redhat.com> References: <20250210161034.76494-1-kwolf@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.0 on 10.30.177.17 Received-SPF: pass client-ip=170.10.133.124; envelope-from=kwolf@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -34 X-Spam_score: -3.5 X-Spam_bar: --- X-Spam_report: (-3.5 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1.388, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=0.001, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org From: Peter Xu There're a bunch of code trying to fetch fs_base in different ways. IIUC the simplest way instead is "$fs_base". It also has the benefit that it'll work for both live gdb session or coredumps. Signed-off-by: Peter Xu Message-ID: <20241212204801.1420528-3-peterx@redhat.com> Reviewed-by: Kevin Wolf Signed-off-by: Kevin Wolf --- scripts/qemugdb/coroutine.py | 23 ++--------------------- 1 file changed, 2 insertions(+), 21 deletions(-) diff --git a/scripts/qemugdb/coroutine.py b/scripts/qemugdb/coroutine.py index 7db46d4b68..20f76ed37b 100644 --- a/scripts/qemugdb/coroutine.py +++ b/scripts/qemugdb/coroutine.py @@ -13,28 +13,9 @@ VOID_PTR = gdb.lookup_type('void').pointer() -def get_fs_base(): - '''Fetch %fs base value using arch_prctl(ARCH_GET_FS). This is - pthread_self().''' - # %rsp - 120 is scratch space according to the SystemV ABI - old = gdb.parse_and_eval('*(uint64_t*)($rsp - 120)') - gdb.execute('call (int)arch_prctl(0x1003, $rsp - 120)', False, True) - fs_base = gdb.parse_and_eval('*(uint64_t*)($rsp - 120)') - gdb.execute('set *(uint64_t*)($rsp - 120) = %s' % old, False, True) - return fs_base - def pthread_self(): - '''Fetch pthread_self() from the glibc start_thread function.''' - f = gdb.newest_frame() - while f.name() != 'start_thread': - f = f.older() - if f is None: - return get_fs_base() - - try: - return f.read_var("arg") - except ValueError: - return get_fs_base() + '''Fetch the base address of TLS.''' + return gdb.parse_and_eval("$fs_base") def get_glibc_pointer_guard(): '''Fetch glibc pointer guard value'''