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Marchesi" , Beau Belgrave , Linus Torvalds , Andrew Morton , Florian Weimer , Kees Cook , "Carlos O'Donell" , Sam James , Dylan Hatch Subject: [PATCH v4 06/12] unwind_user/sframe: Enable archs with encoded SFrame CFA offsets Date: Tue, 27 Jan 2026 16:19:19 +0100 Message-ID: <20260127151926.2805123-7-jremus@linux.ibm.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260127151926.2805123-1-jremus@linux.ibm.com> References: <20260127151926.2805123-1-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-GUID: GJU1NxnSV8_CkvJAce5SPPsF0ls5J7q8 X-Authority-Analysis: v=2.4 cv=Uptu9uwB c=1 sm=1 tr=0 ts=6978d78b cx=c_pps a=3Bg1Hr4SwmMryq2xdFQyZA==:117 a=3Bg1Hr4SwmMryq2xdFQyZA==:17 a=vUbySO9Y5rIA:10 a=VkNPw1HP01LnGYTKEx00:22 a=VnNF1IyMAAAA:8 a=F2OLnndEFUwyb2Hjky0A:9 X-Proofpoint-ORIG-GUID: szHCqXrRk7xpKVwgi1SdQYceHPmsBHLo X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMTI3MDEyMSBTYWx0ZWRfX7DJExOXoYzwt 7bAAezZpIYG375vGLCZoHpTOLkOCivXD3I3CwJ1PrVakrSozMBuFfqo5X3cfvVO6e86Ocqt76bR 2TE7l6jd2pI1hP6Hd7ZfXUO+TgpL/m3gewtC7Ki5cbXh/zGot0kGQTb/jynVGQcdC1ESZCBVuIT a9AYs3Vntv48qUq+JZC827TS59DbK1/LfY/JQ3e+DkOp9xcFf2hK+djIOtfZt66uhcZLrERqi29 B9jBxX0cBllN/UIv+yrE+T1maRUTTthdmA8e9XkTDWaw293ejfSvugrN+lZwemLKfqWBflOcY0S drPMQI7Pzn4HTs3eCqRdnDKY7/2221j7bGdINSj/Lon3UFbfQqa3CwL+1ApsMt9JV9GqakhdriD lZkCtWcUbNg9khA4Q6PpGHLymDNp+VnrejLcNNIu3VGtMF9zxpqqcHGL1lO19na2H5PtxdNtJtJ +QClNmWRte3j5ZTTMJg== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-01-27_03,2026-01-27_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 priorityscore=1501 clxscore=1015 lowpriorityscore=0 phishscore=0 adultscore=0 impostorscore=0 bulkscore=0 spamscore=0 suspectscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2601150000 definitions=main-2601270121 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 | 2 ++ 2 files changed, 10 insertions(+) diff --git a/include/asm-generic/unwind_user_sframe.h b/include/asm-generic= /unwind_user_sframe.h index 8c9ac47bc8bd..117b05e1dcab 100644 --- a/include/asm-generic/unwind_user_sframe.h +++ b/include/asm-generic/unwind_user_sframe.h @@ -9,4 +9,12 @@ #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 + #endif /* _ASM_GENERIC_UNWIND_USER_SFRAME_H */ diff --git a/kernel/unwind/sframe.c b/kernel/unwind/sframe.c index 6a6221ce6d12..5ac502f16bad 100644 --- a/kernel/unwind/sframe.c +++ b/kernel/unwind/sframe.c @@ -209,6 +209,7 @@ __read_regular_fre_datawords(struct sframe_section *sec, =20 UNSAFE_GET_USER_INC(cfa_off, cur, dataword_size, Efault); dataword_count--; + cfa_off =3D sframe_cfa_offset_decode(cfa_off); =20 ra_off =3D sec->ra_off; if (!ra_off && dataword_count) { @@ -258,6 +259,7 @@ __read_flex_fde_fre_datawords(struct sframe_section *se= c, UNSAFE_GET_USER_INC(cfa_ctl, cur, dataword_size, Efault); UNSAFE_GET_USER_INC(cfa_off, cur, dataword_size, Efault); dataword_count -=3D 2; + cfa_off =3D sframe_cfa_offset_decode(cfa_off); =20 ra_off =3D sec->ra_off; ra_ctl =3D ra_off ? 2 : 0; /* regnum=3D0, deref_p=3D(ra_off !=3D 0), reg_= p=3D0 */ --=20 2.51.0