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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 v2 11/15] unwind_user/sframe: Enable archs with encoded SFrame CFA offsets Date: Fri, 5 Dec 2025 18:14:42 +0100 Message-ID: <20251205171446.2814872-12-jremus@linux.ibm.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20251205171446.2814872-1-jremus@linux.ibm.com> References: <20251205171446.2814872-1-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-Authority-Analysis: v=2.4 cv=dK+rWeZb c=1 sm=1 tr=0 ts=69331312 cx=c_pps a=GFwsV6G8L6GxiO2Y/PsHdQ==:117 a=GFwsV6G8L6GxiO2Y/PsHdQ==:17 a=wP3pNCr1ah4A:10 a=VkNPw1HP01LnGYTKEx00:22 a=VnNF1IyMAAAA:8 a=Og4hOgGxDI197znzLmcA:9 X-Proofpoint-GUID: RMRN7OWk_9MJjrE7cvf-IghfKu4EUnjs X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUxMTI5MDAyMCBTYWx0ZWRfX8e5OEzpFdqo4 dWPGEpHWigiCCgflh72YgXiQlzkiOEkzmCQTIc8Y1QSdIZH+G3IwJbJNeOl2XcS3g/DKHI7yl1f Nc5qJLNjT/lHweNoQip2b++RKBx95tilPe2PWZcCH8b+Tsa8jhqlq7c3JmMUarYgizvYBVBqCv4 TwKMZb8MqQiMGWMXZvwGJpTV8wJOPFLuVBD1yQm5fdzpMgRpYkSLdab1EOVxsYQvalQU1bfCR9M eHOQ6eKmI2c5X3yLl7pinqzg/QH6PCjw2k+3HO3SExJCM+mt7JGFKhszEHyFoWEjICJpjB5tq6i goCilaBSIHP8QDsvlxxG9G5Bj9OomRalOKjxipl18O6osy6cyEcfD7qYACcF7R+jKtb6qNIZrJI hyu9UfhXWgh0XQqGuMwJiZTlOJebGQ== X-Proofpoint-ORIG-GUID: qLY2n_RsK3nXmW4HSI7Ir3EJHqpPCDgK 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=2025-12-05_06,2025-12-04_04,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 lowpriorityscore=0 clxscore=1015 priorityscore=1501 bulkscore=0 adultscore=0 phishscore=0 impostorscore=0 spamscore=0 malwarescore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2510240000 definitions=main-2511290020 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 163961ca5252..80ae9bfaa88d 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