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(unknown [9.124.222.159]) by smtpav03.fra02v.mail.ibm.com (Postfix) with ESMTP; Thu, 22 Jan 2026 21:19:49 +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 Subject: [PATCH v4 4/6] powerpc64/bpf: Add arch_bpf_stack_walk() for BPF JIT Date: Fri, 23 Jan 2026 02:48:52 +0530 Message-ID: <20260122211854.5508-5-adubey@linux.ibm.com> X-Mailer: git-send-email 2.48.1 In-Reply-To: <20260122211854.5508-1-adubey@linux.ibm.com> References: <20260122211854.5508-1-adubey@linux.ibm.com> X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-GUID: Bi1LIpXrrGVye6rfzAQkPQovYN59Ekfz X-Authority-Analysis: v=2.4 cv=LaIxKzfi c=1 sm=1 tr=0 ts=69729481 cx=c_pps a=GFwsV6G8L6GxiO2Y/PsHdQ==:117 a=GFwsV6G8L6GxiO2Y/PsHdQ==:17 a=vUbySO9Y5rIA:10 a=VkNPw1HP01LnGYTKEx00:22 a=VnNF1IyMAAAA:8 a=ovcAVf-9gG4EF5hqTukA:9 X-Proofpoint-ORIG-GUID: BWYecn5M-kVPH1btpTP8sK0d8HdbdFG4 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMTIyMDE2MiBTYWx0ZWRfX2YhzRuJhLt/I eK5YHBqr1K76OrTkancm/KzY8JobRFCIAG2GZIZma4pigrSKQMMaRcWRIZ+ogDcc+tlH/CiRAzQ /J41SqKdvOQ8JgrGk/umy8YEB1Tg3RNC163EyWLw1Kj0qUrgft3ZS7wAAyvYYLPHKdn2xIcYltX V1/+kP6Eorgy8Frp/a3whSjC+g7Cv5u5W+Wx7ebStVxYACvwe2n9Dzud1ow45PefvmPqEykE9OA tVUZ0LJmrwWtlVv3KY9FLOppMDIzGfZ55RnSXuZahrhZTuuqLcXDvK1leu2oOfjchZbTTkgi/BU MR8N05Zuj7IKxvhwHy1I32YBt4bG4CkHs6yGNwvQ/CicRTJP6HjHoGTtFHoupd+7TIpVDdlokEr UHzGobbJTVv138CugPrhbk6LlCBKxz+61gap0IO1SMbxUqsLDTUbdK+U+nkECIiTGuUt0BNVyGV H8BGWO9eKYRmLT6PsVg== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.20,FMLib:17.12.100.49 definitions=2026-01-22_05,2026-01-22_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 adultscore=0 phishscore=0 priorityscore=1501 lowpriorityscore=0 suspectscore=0 clxscore=1015 impostorscore=0 spamscore=0 malwarescore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2601150000 definitions=main-2601220162 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_comp64.c index 18da5a866447..c25ba1ad587a 100644 --- a/arch/powerpc/net/bpf_jit_comp64.c +++ b/arch/powerpc/net/bpf_jit_comp64.c @@ -247,6 +247,34 @@ void bpf_jit_build_epilogue(u32 *image, struct codegen_context *ctx) bpf_jit_build_fentry_stubs(image, ctx); } +void arch_bpf_stack_walk(bool (*consume_fn)(void *, u64, u64, u64), void *cookie) +{ + // callback processing always in current context + unsigned long fp = current_stack_frame(); + + for (;;) { + unsigned long *frame = (unsigned long *) fp; + unsigned long ip; + + if (!validate_sp(fp, current)) + return; + + ip = 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 = frame[0]; + } +} + int bpf_jit_emit_func_call_rel(u32 *image, u32 *fimage, struct codegen_context *ctx, u64 func) { unsigned long func_addr = func ? ppc_function_entry((void *)func) : 0; -- 2.48.1