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Peter Anvin" , Namhyung Kim , Andrii Nakryiko , Kees Cook , Sam James Subject: [RFC PATCH v1 23/25] s390/ptrace: Provide frame_pointer() Date: Tue, 18 Aug 2026 16:49:52 +0200 Message-ID: <20260818144954.2320378-24-jremus@linux.ibm.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260818144954.2320378-1-jremus@linux.ibm.com> References: <20260818144954.2320378-1-jremus@linux.ibm.com> Precedence: bulk X-Mailing-List: linux-trace-kernel@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-Spam-Details-Enc: AW1haW4tMjYwODE4MDEwNyBTYWx0ZWRfX+UXG7ZvKiwxT YH4ZZnBFA/zfTx7Y0FoYRFxuOBghkJkKAgvL9PxAD7e/nM59WaFaAcBEcunR95NKzFdFeqnvJiz QYiO2opTMZTB267fDe2btwD7j4yZDeBto4MXaSe5RPHdSV9BFsaBY4Z/Bjif89ZuluBdoUybs8S whF3y96eLZVlcbQUTcVHCaZJ14O1aX00B17Y8ExrTQw0ywoOKTTnqS84eC+LyUD5sY17pRzZ1Lr oZmTvj83uId8pxjWBvLNTicamsFf7dQaaOYOB91Aj62Llnr8JTDnNyUZ+kz9OlP6tE3QVC5vSiP qC3atWpT3RcfPRL2vIgM/3EO9dSQE3OFj8ICd5RVUnYQ9J+YKrbSF25ecm8Npw6SNiopa7sGcl5 uWy8QldFSIGCV7fq+3ziJRvzzZR+Ef85kKQ7Z3in8ZSfX1gnI7HGWogEzNR48ATwx6a8tvZrMgZ wkrTtRmJqhrSNDWoLLg== X-Proofpoint-Spam-Info: AW1haW4tMjYwODE4MDEwNyBTYWx0ZWRfXztlaixwly7Xw 8ICfhstMuf/XBRkTOenWnhp50g5T4xHyltik5j5OZIM4nP3IK1RylGEK7w1eWj4Ocf5Y25Q+gwA 7zY4mOY4EglWxgUzbVTUGnv06PtiJ7c= X-Authority-Analysis: v=2.4 cv=JKkLdcKb c=1 sm=1 tr=0 ts=6a847121 cx=c_pps a=bLidbwmWQ0KltjZqbj+ezA==:117 a=bLidbwmWQ0KltjZqbj+ezA==:17 a=Sv0fKeRqtYgA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=Y2IxJ9c9Rs8Kov3niI8_:22 a=NEAV23lmAAAA:8 a=VwQbUJbxAAAA:8 a=VnNF1IyMAAAA:8 a=_uadzYZ_BUT95G4SQMEA:9 X-Proofpoint-ORIG-GUID: J0cydBPEqobJU7znXVoBFXy7bmr0rvK9 X-Proofpoint-GUID: GNqhp0ySPe9BgUf1URAWsMhu9AkWXpKZ 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=2026-08-18_02,2026-08-18_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 bulkscore=0 malwarescore=0 priorityscore=1501 lowpriorityscore=0 clxscore=1015 adultscore=0 impostorscore=0 spamscore=0 phishscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2608180107 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