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Marchesi" , Beau Belgrave , Linus Torvalds , Andrew Morton , Jens Axboe , Florian Weimer , Sam James Subject: [RFC PATCH v1 09/16] unwind_user/sframe: Enable archs with encoded SFrame CFA offsets Date: Thu, 10 Jul 2025 18:35:15 +0200 Message-ID: <20250710163522.3195293-10-jremus@linux.ibm.com> X-Mailer: git-send-email 2.48.1 In-Reply-To: <20250710163522.3195293-1-jremus@linux.ibm.com> References: <20250710163522.3195293-1-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=GL8IEvNK c=1 sm=1 tr=0 ts=686febd3 cx=c_pps a=5BHTudwdYE3Te8bg5FgnPg==:117 a=5BHTudwdYE3Te8bg5FgnPg==:17 a=Wb1JkmetP80A:10 a=VnNF1IyMAAAA:8 a=Og4hOgGxDI197znzLmcA:9 X-Proofpoint-ORIG-GUID: eIOvg8Wub475XZyy23-eoHTnvFKsHL4r X-Proofpoint-GUID: eIOvg8Wub475XZyy23-eoHTnvFKsHL4r X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUwNzEwMDEzOSBTYWx0ZWRfX5HZjNHwLj/gH 9xIzYquVxSacjVxI9K5pMvOcTDYwxkZ96PYItwu+TV91D6xvF0x6WsGW+c1sKfNm2Xz6nnoBMuK sYUPRkyYzgBvadYXY1v3ypFya0H8On2d1irUt5I/PJA+1lVDTtDvmiPfwKGEGWmqABq8Z6E2D/c AJ/vhywwZiApok8R6g/RbuWnaiCE4QVbxC6NXIY8P5cIE5402LnchihDMEMwTMXRB33VUafdURc E+cbRhvtFUfSCN62fHIcZOZvyBI7zpo0k7Z4RRlwcMgrbqszQSITqhBoZF9aSGKqnaYGt8ecBRC 6MQz+fRqgzD5rT5E+8CDqkFcfUEGQJQ99/oyS86PGewF32oyJYvPHe4z3mRQnHPhWgboz3w5Nhf jiT4wQ4G01odhthsbAwHdwbWMwURgca4AGar2pFDgmvMdgqYCIx5XMi1740dC25qWzTb+4TP X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1099,Hydra:6.1.7,FMLib:17.12.80.40 definitions=2025-07-10_04,2025-07-09_01,2025-03-28_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 phishscore=0 clxscore=1015 impostorscore=0 suspectscore=0 bulkscore=0 adultscore=0 priorityscore=1501 mlxscore=0 spamscore=0 mlxlogscore=918 lowpriorityscore=0 classifier=spam authscore=0 authtc=n/a authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2505280000 definitions=main-2507100139 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 --- include/asm-generic/unwind_user_sframe.h | 11 +++++++++++ kernel/unwind/sframe.c | 1 + 2 files changed, 12 insertions(+) diff --git a/include/asm-generic/unwind_user_sframe.h b/include/asm-generic= /unwind_user_sframe.h index 8cef3e0857b6..cea0410a259a 100644 --- a/include/asm-generic/unwind_user_sframe.h +++ b/include/asm-generic/unwind_user_sframe.h @@ -5,6 +5,16 @@ #include #include =20 +/** + * generic_sframe_cfa_offset_decode - Decode SFrame CFA offset. + * + * Returns the decoded SFrame CFA offset value. + */ +static inline s32 generic_sframe_cfa_offset_decode(s32 offset) +{ + return offset; +} + /** * generic_sframe_set_frame_reginfo - Populate info to unwind FP/RA regist= er * from SFrame offset. @@ -48,6 +58,7 @@ static inline s32 generic_sframe_sp_val_off(void) return 0; } =20 +#define sframe_cfa_offset_decode generic_sframe_cfa_offset_decode #define sframe_set_frame_reginfo generic_sframe_set_frame_reginfo #define sframe_sp_val_off generic_sframe_sp_val_off =20 diff --git a/kernel/unwind/sframe.c b/kernel/unwind/sframe.c index 43ef3a8c4c26..e8658401a286 100644 --- a/kernel/unwind/sframe.c +++ b/kernel/unwind/sframe.c @@ -220,6 +220,7 @@ 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 2.48.1