From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mx0a-001b2d01.pphosted.com (mx0a-001b2d01.pphosted.com [148.163.156.1]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 2B17440F736; Fri, 21 Aug 2026 19:54:41 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=148.163.156.1 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787342083; cv=none; b=hgg5njbIiDuD4VtEgGytlJR4Btvrv//Y4+rzRb52eAOFrZmCPYbq6V/9RNOBO31/O6WDMUOC3V82xDJkQijU/rgkepkSytHegBzS5EFTr1wkSDmrERHCcro4glbhI/TCejC6GULe4yDojx6Azr/R+ljWntVxqcAyJlGd6EMmkt4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787342083; c=relaxed/simple; bh=QWiO/oVjltZVMmCOotSP7wKcIueRwp06oxRRGGodGAs=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=s/Kk7Qb8HDie0FhMqrLziO1wmfRUP5YjhDVKE0lpPs7U9QSMKbGOPHIHMXLzjGMUxAXzseV4hnFJawAM40dy7kZtCodc8rVlH4kJOI+PNGazqxjNB9n8Yay+MpqeMBLUD4shrXQUZmhn7WcoPRqS+ezzBYNIt7uzIhLXkUgTmzk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.ibm.com; spf=pass smtp.mailfrom=linux.ibm.com; dkim=pass (2048-bit key) header.d=ibm.com header.i=@ibm.com header.b=TOhtz60v; arc=none smtp.client-ip=148.163.156.1 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.ibm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.ibm.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=ibm.com header.i=@ibm.com header.b="TOhtz60v" Received: from pps.filterd (m0353729.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.18.1.11/8.18.1.11) with ESMTP id 67LIVYdr491713; Fri, 21 Aug 2026 19:53:19 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=cc :content-transfer-encoding:date:from:in-reply-to:message-id :mime-version:references:subject:to; s=pp1; bh=Y+euVRI6M/Fa6YfSr 8B9MiMOGuuw4vVLdiMUtQIZdas=; b=TOhtz60vQ41nFEGwl5CIRg0ZJ+l35cTqm 3xvsdIJCcRMND7kmKAekXMHUrUcgx8hYHkcWv1YVDGIH6QtEJCeOQkbcWG1/4mi+ iQpQe9LvBqcFEJET0fH7/HPlP/0z/u52c19ESPS3CrY8Av/GE1r0NYywq7VOXCxZ QALuLeyGOMf2Z1JmrS4op1WqME9HH82Um9vfnkswgMfupfJsVvdydw2zjUh/8inM c5CbhlYMrCWVTG2wY3QSXHR2jZM5DldUni8gXpxArmSNPuKPDDtVA3/tT/3cv7Xv dryoae9Tmb4AXIyG3pZoNtYgJomIkk17JY8KoSCZ8NqhRWFU447sg== Received: from ppma21.wdc07v.mail.ibm.com (5b.69.3da9.ip4.static.sl-reverse.com [169.61.105.91]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 4g4yu0kvdj-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 21 Aug 2026 19:53:18 +0000 (GMT) Received: from pps.filterd (ppma21.wdc07v.mail.ibm.com [127.0.0.1]) by ppma21.wdc07v.mail.ibm.com (8.18.1.7/8.18.1.7) with ESMTP id 67LJfJOM021077; Fri, 21 Aug 2026 19:53:17 GMT Received: from smtprelay05.fra02v.mail.ibm.com ([9.218.2.225]) by ppma21.wdc07v.mail.ibm.com (PPS) with ESMTPS id 4g33ekpnyh-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 21 Aug 2026 19:53:17 +0000 (GMT) Received: from smtpav03.fra02v.mail.ibm.com (smtpav03.fra02v.mail.ibm.com [10.20.54.102]) by smtprelay05.fra02v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 67LJrBP550331922 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 21 Aug 2026 19:53:11 GMT Received: from smtpav03.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 7262120040; Fri, 21 Aug 2026 19:53:11 +0000 (GMT) Received: from smtpav03.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 2BB0020043; Fri, 21 Aug 2026 19:53:11 +0000 (GMT) Received: from tuxmaker.boeblingen.de.ibm.com (unknown [9.87.85.9]) by smtpav03.fra02v.mail.ibm.com (Postfix) with ESMTP; Fri, 21 Aug 2026 19:53:11 +0000 (GMT) From: Jens Remus To: linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, linux-s390@vger.kernel.org, x86@kernel.org, Steven Rostedt , Josh Poimboeuf , Peter Zijlstra , Mathieu Desnoyers Cc: Jens Remus , Heiko Carstens , Vasily Gorbik , Alexander Gordeev , Ilya Leoshkevich , Indu Bhagat , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , "H. Peter Anvin" , Namhyung Kim , Andrii Nakryiko , Kees Cook , Sam James , Fangrui Song Subject: [RFC PATCH v2 22/24] s390/ptrace: Provide frame_pointer() Date: Fri, 21 Aug 2026 21:52:57 +0200 Message-ID: <20260821195259.2688377-23-jremus@linux.ibm.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260821195259.2688377-1-jremus@linux.ibm.com> References: <20260821195259.2688377-1-jremus@linux.ibm.com> Precedence: bulk X-Mailing-List: linux-s390@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Reinject: loops=2 maxloops=12 X-Proofpoint-ORIG-GUID: 3nzV6AOfPHHCbrxy4rmssFcpqvGzTx28 X-Proofpoint-GUID: sJV3iXG8PI9gma7BYgItxWlsQCi4IpV3 X-Authority-Analysis: v=2.4 cv=RoX16imK c=1 sm=1 tr=0 ts=6a88acaf cx=c_pps a=GFwsV6G8L6GxiO2Y/PsHdQ==:117 a=GFwsV6G8L6GxiO2Y/PsHdQ==:17 a=Sv0fKeRqtYgA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=uAbxVGIbfxUO_5tXvNgY:22 a=NEAV23lmAAAA:8 a=VwQbUJbxAAAA:8 a=VnNF1IyMAAAA:8 a=_uadzYZ_BUT95G4SQMEA:9 X-Proofpoint-Spam-Info: AW1haW4tMjYwODIxMDE1NSBTYWx0ZWRfX4VPgQYp+Bj7v ZqENTHps6NKG3o8wU3nVz8F/tgfhaQI8wvjBOckho17DsCdrV51WX8O0BUBb+IqjtpWesb3bPCn 5C/pz4OAHkz+3T443Kx1uLt2XBM0Qkg= X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwODIxMDE1NSBTYWx0ZWRfX2oYEHYbnYwdE q/nppDQnWaC7gII1SOCPuHlbehvP3+uFpi+TYrMquEIhxYcHMLVHE9e1pZyfqIsdeZZ1p40tJHN jGOjo5ryALhXNg7qvB0i9oEsqj/SHr2ysQoxll+fmJJkbFUFYDDr8/HlnS26iUv1MQSj2p3lJbI A1h3aFZdCPdNZ7/1h6wzDw20pHiFeD4HnV6Se7k4cu+HU7x/Nd1yXQiNaN3n7xHFC6ZHlM8B+US nrfqc1+3nmxQ8xMLFQtWVJh7b7o16NOb+Ttoob3DnhQYPvCd47vUj5KyZu6+swyOVVTu1XSzMoL A8yKHgxJcweARhBBKXQA3Ymt2sqD33NuDBDdqkQ0qM3zwDSrz3XyCf25eP2DRXLDm2+RX0IKRMa shHSJZSbEVzUfF+GoO5w6wYlmemLDM5UQ/PVSlNfCAVvezlIecin04YmGPsp0dfvrc8HiFsfnaq HL6z3Iv/ju/s2sN4n3Q== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-08-21_06,2026-08-21_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 impostorscore=0 suspectscore=0 malwarescore=0 adultscore=0 clxscore=1015 phishscore=0 spamscore=0 bulkscore=0 lowpriorityscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2608210155 On s390 64-bit the s390x ELF ABI [1] designates register 11 as the "preferred" frame pointer (FP) register in user space. [1]: s390x ELF ABI, https://github.com/IBM/s390x-abi/releases Signed-off-by: Jens Remus --- Notes (jremus): Cherry-picked from "[PATCH v4 00/12] s390: SFrame user space unwinding" series and adjusted to .eh_frame: https://lore.kernel.org/all/20260127151926.2805123-9-jremus@linux.ibm.com/ arch/s390/include/asm/ptrace.h | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/arch/s390/include/asm/ptrace.h b/arch/s390/include/asm/ptrace.h index 495e310c3d6d..85765979a595 100644 --- a/arch/s390/include/asm/ptrace.h +++ b/arch/s390/include/asm/ptrace.h @@ -255,6 +255,12 @@ static __always_inline unsigned long user_stack_pointer(const struct pt_regs *re return regs->gprs[15]; } +static __always_inline unsigned long frame_pointer(const struct pt_regs *regs) +{ + /* Return ABI-designated "preferred" frame-pointer register value. */ + return regs->gprs[11]; +} + static __always_inline unsigned long regs_get_register(const struct pt_regs *regs, unsigned int offset) { -- 2.53.0