From nobody Sat Feb 7 15:59:58 2026 Received: from mx0b-001b2d01.pphosted.com (mx0b-001b2d01.pphosted.com [148.163.158.5]) (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 AA2533164B8; Mon, 5 Jan 2026 10:53:32 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=148.163.158.5 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767610414; cv=none; b=sPqpzRKXJgCMP9PuhGa+TBUIWMu4MYwD4riU3RtAa7+xuLu2B5rgo8I1lff1RUjObPNTqpW4rvO0MO1MQHLmpkx5VAz25z88cssRHg1zUOREy+mIswbtXLQr6cvqtv5QR4dSUyHJpFygLa7Oub7GUd4ivEGgM/GNy4swmr2pPB8= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767610414; c=relaxed/simple; bh=lRtu9kw1ZhjXWN+KoM32YsPv1tHn0e8qSptl/UDCCP4=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=kOmW/JRpBsTR7SBmaRDSWBXem82rLxj5Vd2hHl+tMGOR1/r/6iBF0toRlScZh3FDYu11TXfBHQsFUQWWF0iWWGZIRCXu4MuOZtkvcDcPTiQGjDKN0JYCsxb+Q1/Mm4YSbdNznCBaqInr+T+GrBhY4rwR/roNOOY7WjufMCgZftw= 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=XWSIeIo0; arc=none smtp.client-ip=148.163.158.5 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="XWSIeIo0" Received: from pps.filterd (m0360072.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.18.1.2/8.18.1.2) with ESMTP id 604GPB0w026573; Mon, 5 Jan 2026 10:53:04 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=wzBaK8qWCdkqUY3g3 Sj7Uoi09hD+8UHUGtCXe7xrww4=; b=XWSIeIo0bW23L4gDlGvrs5W+b77vSVXhJ K0m+iqZK9PbxvJOhDyt9bpOEQl2yXRr800GY93lyP/SkAe+/MtCyeP4Av9ulC34+ 8HKeselPnsN56tiNTYAyCgROnHmSOa7Q1rJXgCzD/6Atpq0PToasqvqqndEXQijK 6VBR01d/LUx5/tdFSGLTcqCq5QoX+VMePHq++YnCWtc4lujmoR1fMh4qXCBNTMM7 9/0N1wwWgKShkeRc9hNm1wx2mb4IPR3mW8eLnBr6KLGQG4OoGTlSNwzXHfwXp3Ek 3upNx9Eno3yZasVsS0zRwyN8MZQemtIpb5m+VLfvGWVTIcqhgr2Fg== Received: from pps.reinject (localhost [127.0.0.1]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 4betrte68c-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 05 Jan 2026 10:53:04 +0000 (GMT) Received: from m0360072.ppops.net (m0360072.ppops.net [127.0.0.1]) by pps.reinject (8.18.1.12/8.18.0.8) with ESMTP id 605Aflws021848; Mon, 5 Jan 2026 10:53:03 GMT Received: from ppma11.dal12v.mail.ibm.com (db.9e.1632.ip4.static.sl-reverse.com [50.22.158.219]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 4betrte68a-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 05 Jan 2026 10:53:03 +0000 (GMT) Received: from pps.filterd (ppma11.dal12v.mail.ibm.com [127.0.0.1]) by ppma11.dal12v.mail.ibm.com (8.18.1.2/8.18.1.2) with ESMTP id 6058CIJB019161; Mon, 5 Jan 2026 10:53:02 GMT Received: from smtprelay05.fra02v.mail.ibm.com ([9.218.2.225]) by ppma11.dal12v.mail.ibm.com (PPS) with ESMTPS id 4bfg50w08b-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 05 Jan 2026 10:53:02 +0000 Received: from smtpav06.fra02v.mail.ibm.com (smtpav06.fra02v.mail.ibm.com [10.20.54.105]) by smtprelay05.fra02v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 605AqwGm35717390 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 5 Jan 2026 10:52:58 GMT Received: from smtpav06.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id B296E20049; Mon, 5 Jan 2026 10:52:58 +0000 (GMT) Received: from smtpav06.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id D39E520040; Mon, 5 Jan 2026 10:52:52 +0000 (GMT) Received: from abhi.. (unknown [9.124.213.127]) by smtpav06.fra02v.mail.ibm.com (Postfix) with ESMTP; Mon, 5 Jan 2026 10:52:52 +0000 (GMT) From: adubey@linux.ibm.com To: bpf@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org Cc: hbathini@linux.ibm.com, sachinpb@linux.ibm.com, venkat88@linux.ibm.com, andrii@kernel.org, eddyz87@gmail.com, mykolal@fb.com, ast@kernel.org, daniel@iogearbox.net, martin.lau@linux.dev, song@kernel.org, yonghong.song@linux.dev, john.fastabend@gmail.com, kpsingh@kernel.org, sdf@fomichev.me, haoluo@google.com, jolsa@kernel.org, christophe.leroy@csgroup.eu, naveen@kernel.org, maddy@linux.ibm.com, mpe@ellerman.id.au, npiggin@gmail.com, memxor@gmail.com, iii@linux.ibm.com, shuah@kernel.org, Abhishek Dubey Subject: [PATCH 4/6] powerpc64/bpf: Add arch_bpf_stack_walk() for BPF JIT Date: Mon, 5 Jan 2026 16:22:10 +0530 Message-ID: <20260105105212.136645-5-adubey@linux.ibm.com> X-Mailer: git-send-email 2.48.1 In-Reply-To: <20260105105212.136645-1-adubey@linux.ibm.com> References: <20260105105212.136645-1-adubey@linux.ibm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-TM-AS-GCONF: 00 X-Authority-Analysis: v=2.4 cv=aaJsXBot c=1 sm=1 tr=0 ts=695b9810 cx=c_pps a=aDMHemPKRhS1OARIsFnwRA==:117 a=aDMHemPKRhS1OARIsFnwRA==:17 a=vUbySO9Y5rIA:10 a=VkNPw1HP01LnGYTKEx00:22 a=VnNF1IyMAAAA:8 a=ovcAVf-9gG4EF5hqTukA:9 X-Proofpoint-GUID: 1uSL2weSR1s7cYHIVMHughtrBm0l5nTR X-Proofpoint-ORIG-GUID: tpHHNSAoaRePyi43WYGB6w5odCvUn63K X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMTA1MDA5NSBTYWx0ZWRfX24Ob40dEZRU3 4OeIU1sWWHJj6V9Ero72BF35800d8+4vHVBb5/GIWkh6/A8enM+2p3FpVBtboHL7CXeLyHHfjRa e+vsHPd4noSEadDT4UhV0ZdKRJcnhgLDE0wM9RO0dtrt0cRAAkUj8xOf48bd9nykQcr/aUaJSbM +ATcObndzJHpS18pdsTW9Js2Dm2BYaDmMszLAjm0Xna0fb+3PpuNLfTdyILL0tHFphqMbL+yZq8 jtdBTVE/OvLB19fnSklIaDf5LduA/O6Z8EQAc9mNgRkjr4/h19ws/d/UnVzU2fPfT/vC9l/qNaV OpXlxhCPA6yKWI2tMAMznNBhj3cr/S6XemSthsGMcJl2avlrK4X90bVnoCC+VTOAcVjUP1OdJlf Fz9weRbgutZEG+S508m7SEsKchu4VSqtbDBXrJw6txutUxu4UVYEwKIPAZcPYev8Lgou8gwcjEX OEWHq7uYip4Xt6eUMqg== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.9,FMLib:17.12.100.49 definitions=2026-01-05_01,2025-12-31_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 adultscore=0 lowpriorityscore=0 bulkscore=0 malwarescore=0 priorityscore=1501 clxscore=1015 phishscore=0 spamscore=0 impostorscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2512120000 definitions=main-2601050095 Content-Type: text/plain; charset="utf-8" From: Abhishek Dubey This function is used by bpf_throw() to unwind the stack until frame of exception-boundary during BPF exception handling. This function is necessary to support BPF exceptions on PowerPC. Signed-off-by: Abhishek Dubey --- arch/powerpc/net/bpf_jit_comp64.c | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) diff --git a/arch/powerpc/net/bpf_jit_comp64.c b/arch/powerpc/net/bpf_jit_c= omp64.c index 37c547b49da8..0f3af67914d6 100644 --- a/arch/powerpc/net/bpf_jit_comp64.c +++ b/arch/powerpc/net/bpf_jit_comp64.c @@ -237,6 +237,34 @@ void bpf_jit_build_epilogue(u32 *image, struct codegen= _context *ctx) bpf_jit_build_fentry_stubs(image, ctx); } =20 +void arch_bpf_stack_walk(bool (*consume_fn)(void *, u64, u64, u64), void *= cookie) +{ + // callback processing always in current context + unsigned long fp =3D current_stack_frame(); + + for (;;) { + unsigned long *frame =3D (unsigned long *) fp; + unsigned long ip; + + if(!validate_sp(fp, current)) + return; + + ip =3D frame[STACK_FRAME_LR_SAVE]; + if (!ip) + break; + + /* + * consume_fn common code expects stack pointer(sp) in third + * argument. There is no sp in ppc64, rather pass frame + * pointer. + */ + if (ip && !consume_fn(cookie, ip, fp, fp)) + break; + + fp =3D frame[0]; + } +} + int bpf_jit_emit_func_call_rel(u32 *image, u32 *fimage, struct codegen_con= text *ctx, u64 func) { unsigned long func_addr =3D func ? ppc_function_entry((void *)func) : 0; --=20 2.48.1