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Wed, 22 Apr 2026 14:18:37 +0000 (GMT) Received: from [9.52.200.195] (unknown [9.52.200.195]) by smtpav05.fra02v.mail.ibm.com (Postfix) with ESMTP; Wed, 22 Apr 2026 14:18:37 +0000 (GMT) Message-ID: <6a50cb4a-54d4-465e-9bf0-8419c9f61338@linux.ibm.com> Date: Wed, 22 Apr 2026 16:18:35 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v4 3/8] arm64: entry: add unwind info for various kernel entries To: Dylan Hatch , Roman Gushchin , Weinan Liu , Will Deacon , Josh Poimboeuf , Indu Bhagat , Peter Zijlstra , Steven Rostedt , Catalin Marinas , Jiri Kosina Cc: Mark Rutland , Prasanna Kumar T S M , Puranjay Mohan , Song Liu , joe.lawrence@redhat.com, linux-toolchains@vger.kernel.org, linux-kernel@vger.kernel.org, live-patching@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Randy Dunlap References: <20260421225200.1198447-1-dylanbhatch@google.com> <20260421225200.1198447-4-dylanbhatch@google.com> Content-Language: en-US From: Jens Remus Organization: IBM Deutschland Research & Development GmbH In-Reply-To: <20260421225200.1198447-4-dylanbhatch@google.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Reinject: loops=2 maxloops=12 X-Proofpoint-GUID: n-EqorD4jfKWCCxQL8vbgZkFDo_qidlt X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNDIyMDEzOCBTYWx0ZWRfX6WZX6PogNqvr WU3ArGqKfZPA9oyav/tcBZ51ToF6a/FPzyTKOiXqKmqkfDQsAzV9yux2IgnNOx8TCIFCiw9hH1R 9TdG38x/savHXHcd0zfl9fGX2FNPA+d522JmoUNSaK9rf5qmY6E7KEmp+A7GJOkxSqiHycT8Rur gMd1WvzVYCjwfSw6/siTEgeExX9LQeMVADbF+isxpQGVLqyBZk+Nt38y08sNsnbTUJysmHyNiyU 4MXY31Gh/SS1j5RSREz9lExbl3ii6PFVJRrWMY4moRTCsnP3rB2ZrNSGjPHRH/zov8m8sNr+Rts mKY4+cA2FMNQDReSycEGH946tE4va3wS54Xlx3696hY4BcyYkcZa68BjdIe9/IdqwdeXpDgu0tx lTD5YUtsMZnMTpQmWkKC5/1zV3QD1peUJ/C4IsuReJD5IIC8U+UhEGHUVY3WS1HJ8vfc8mE8ioc zD+ovYjNWZ39YB9gtuw== X-Authority-Analysis: v=2.4 cv=a6kAM0SF c=1 sm=1 tr=0 ts=69e8d8c0 cx=c_pps a=5BHTudwdYE3Te8bg5FgnPg==:117 a=5BHTudwdYE3Te8bg5FgnPg==:17 a=IkcTkHD0fZMA:10 a=A5OVakUREuEA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=V8glGbnc2Ofi9Qvn3v5h:22 a=VnNF1IyMAAAA:8 a=1XWaLZrsAAAA:8 a=Ozp-CAkSXV3980NJQmwA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 X-Proofpoint-ORIG-GUID: ffjTc8xH74BgYahFIb1_gUBKxG0c2R-0 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-04-22_01,2026-04-21_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 suspectscore=0 spamscore=0 adultscore=0 bulkscore=0 lowpriorityscore=0 impostorscore=0 clxscore=1015 phishscore=0 priorityscore=1501 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2604200000 definitions=main-2604220138 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260422_071910_906692_CF089CC8 X-CRM114-Status: GOOD ( 16.53 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 4/22/2026 12:51 AM, Dylan Hatch wrote: > From: Weinan Liu > > DWARF CFI (Call Frame Information) specifies how to recover the return > address and callee-saved registers at each PC in a given function. > Compilers are able to generate the CFI annotations when they compile > the code to assembly language. For handcrafted assembly, we need to > annotate them by hand. > > Annotate minimal CFI to enable stacktracing using SFrame for kernel > exception entries through el1*_64_*() paths and irq entries through > call_on_irq_stack() > > Signed-off-by: Weinan Liu > Signed-off-by: Dylan Hatch > Suggested-by: Jens Remus Reviewed-by: Jens Remus > --- > arch/arm64/kernel/entry.S | 23 +++++++++++++++++++++++ > 1 file changed, 23 insertions(+) Regards, Jens -- Jens Remus Linux on Z Development (D3303) jremus@de.ibm.com / jremus@linux.ibm.com IBM Deutschland Research & Development GmbH; Vorsitzender des Aufsichtsrats: Wolfgang Wendt; Geschäftsführung: David Faller; Sitz der Gesellschaft: Ehningen; Registergericht: Amtsgericht Stuttgart, HRB 243294 IBM Data Privacy Statement: https://www.ibm.com/privacy/