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Marchesi" , Beau Belgrave , Linus Torvalds , Andrew Morton , Florian Weimer , Kees Cook , "Carlos O'Donell" , Sam James , Dylan Hatch Subject: [RFC PATCH v3 12/17] unwind_user/sframe: Enable archs with encoded SFrame CFA offsets Date: Mon, 8 Dec 2025 18:15:54 +0100 Message-ID: <20251208171559.2029709-13-jremus@linux.ibm.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20251208171559.2029709-1-jremus@linux.ibm.com> References: <20251208171559.2029709-1-jremus@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-Proofpoint-Spam-Details-Enc: AW1haW4tMjUxMjA2MDAyMCBTYWx0ZWRfX4ulFtPIMsMnd n0lN4X0iPrCkl1VcExJoIuYN/iqAhLqppOGqjT2VTN/F69hw2zPETUe6xVyDH1zjgnGtXt573GL LnZKuWhtrFo3H1ajudeWA5K1FkPHTxDnhxCCp+nWbEpRx6HvbQwImH/40OH6Y83N6eID4O6IAdA nX50F2ig2rRs3NnkjgVT20y/T3zH4Jh+1OPtQAVOfFIb13F1uQTxjmXAEwGn+XXkccN3pksdKpz krvTH7qwLMftGKm9TL8lqTyZvFmWfUvFL5qilUJ1UtWqqa3sPpPVIaNRrLfZFu2cODs8V4g+03c nX03yVBM2rmrRMieje/eV3WWb+u2MVmcmGfSQCSrwApsdWSKTICYbDVzwzhiXZPa/cgf2GMl9yf fypmX9tHVwCMrOgSYcns+C/EnfSCzw== X-Authority-Analysis: v=2.4 cv=S/DUAYsP c=1 sm=1 tr=0 ts=693707dd cx=c_pps a=5BHTudwdYE3Te8bg5FgnPg==:117 a=5BHTudwdYE3Te8bg5FgnPg==:17 a=wP3pNCr1ah4A:10 a=VkNPw1HP01LnGYTKEx00:22 a=VnNF1IyMAAAA:8 a=Og4hOgGxDI197znzLmcA:9 X-Proofpoint-ORIG-GUID: j1cFiGjG-JjgXe0GVQaeUbPpxwj2kWTS X-Proofpoint-GUID: 4i3zmLYnvV2DU_7tgMgCWL4naFKjb--l 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=2025-12-06_02,2025-12-04_04,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 phishscore=0 clxscore=1015 impostorscore=0 suspectscore=0 lowpriorityscore=0 adultscore=0 spamscore=0 bulkscore=0 priorityscore=1501 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2510240000 definitions=main-2512060020 Content-Type: text/plain; charset="utf-8" Enable architectures, such as s390, which store SFrame CFA offset values encoded, to e.g. make (better) use of unsigned 8-bit SFrame offsets. Signed-off-by: Jens Remus --- Notes (jremus): Changes in RFC v2: - Rename generic_sframe_cfa_offset_decode() to sframe_cfa_offset_decode(). (Josh) include/asm-generic/unwind_user_sframe.h | 8 ++++++++ kernel/unwind/sframe.c | 1 + 2 files changed, 9 insertions(+) diff --git a/include/asm-generic/unwind_user_sframe.h b/include/asm-generic= /unwind_user_sframe.h index fd71d6b1916b..ec68a77551f0 100644 --- a/include/asm-generic/unwind_user_sframe.h +++ b/include/asm-generic/unwind_user_sframe.h @@ -10,6 +10,14 @@ #define SFRAME_SP_OFFSET 0 #endif =20 +#ifndef sframe_cfa_offset_decode +static inline s32 sframe_cfa_offset_decode(s32 offset) +{ + return offset; +} +#define sframe_cfa_offset_decode sframe_cfa_offset_decode +#endif + #ifndef sframe_init_reginfo static inline void sframe_init_reginfo(struct unwind_user_reginfo *reginfo, s32 offset) diff --git a/kernel/unwind/sframe.c b/kernel/unwind/sframe.c index 45cd7380ac38..92f770fc21f6 100644 --- a/kernel/unwind/sframe.c +++ b/kernel/unwind/sframe.c @@ -226,6 +226,7 @@ static __always_inline int __read_fre(struct sframe_sec= tion *sec, =20 UNSAFE_GET_USER_INC(cfa_off, cur, offset_size, Efault); offset_count--; + cfa_off =3D sframe_cfa_offset_decode(cfa_off); =20 ra_off =3D sec->ra_off; if (!ra_off && offset_count) { --=20 2.51.0