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Mon, 29 Sep 2025 08:05:04 GMT Received: from smtpav02.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 2504A20040; Mon, 29 Sep 2025 08:05:04 +0000 (GMT) Received: from smtpav02.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id C63322004E; Mon, 29 Sep 2025 08:05:00 +0000 (GMT) Received: from li-2fa77bcc-2701-11b2-a85c-cd621c23b6bd.ibm.com (unknown [9.39.16.189]) by smtpav02.fra02v.mail.ibm.com (Postfix) with ESMTP; Mon, 29 Sep 2025 08:05:00 +0000 (GMT) From: Sathvika Vasireddy To: linux-kbuild@vger.kernel.org, linuxppc-dev@lists.ozlabs.org Cc: nathan@kernel.org, masahiroy@kernel.org, kees@kernel.org, naveen@kernel.org, jpoimboe@kernel.org, peterz@infradead.org, npiggin@gmail.com, maddy@linux.ibm.com, segher@kernel.crashing.org, christophe.leroy@csgroup.eu, mingo@kernel.org, mpe@ellerman.id.au, mahesh@linux.ibm.com, sv@linux.ibm.com Subject: [RFC PATCH v2 0/3] objtool: Fixup alternate feature relative addresses Date: Mon, 29 Sep 2025 13:34:53 +0530 Message-ID: <20250929080456.26538-1-sv@linux.ibm.com> X-Mailer: git-send-email 2.50.1 Precedence: bulk X-Mailing-List: linux-kbuild@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Authority-Analysis: v=2.4 cv=Se/6t/Ru c=1 sm=1 tr=0 ts=68da3db5 cx=c_pps a=AfN7/Ok6k8XGzOShvHwTGQ==:117 a=AfN7/Ok6k8XGzOShvHwTGQ==:17 a=yJojWOMRYYMA:10 a=voM4FWlXAAAA:8 a=pGLkceISAAAA:8 a=VwQbUJbxAAAA:8 a=VnNF1IyMAAAA:8 a=1UX6Do5GAAAA:8 a=5NDuelTg4wUFaKIfu4cA:9 a=IC2XNlieTeVoXbcui8wp:22 a=Et2XPkok5AAZYJIKzHr1:22 a=cPQSjfK2_nFv0Q5t_7PE:22 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUwOTI3MDAxMCBTYWx0ZWRfX/tWPZ6Vw6EGT lbO3fssgkBuFyPBjJO2TIDI/RtKh1NgvEbXZ2N1jiXkY6cZx0shc9lBb9nwcKD7L6uZ6uvoS6Ec pyuDPWlxvTdX8LchkoUHdkvl3VbUnsdygKO4Jve2pGG4Cvpup7FPxHrCizms0LwkS5eHKJ4V/x3 MfYbhmPHZB/GSvPsLcmankdKnALr5XJPlGhS6ZvUSaezk8ARUr8avQvD/8SQl37F0AnsplWW4US nu8ITYSXlNfUaRnugUIftMPZc9oZ59fIHQcMMTOiUA1NmOpZiGpApujersvjWoiRJlx0CjoUjlq wWefvhl1L+R9Kf8XcHwFNoBv9evj13LZVRNn2OmXVBzL4dTe28A78tZa0LpJwcXGKJyCSOxt1+v ex3wZl621/Hyzc6ajAwVM21X1BEDXw== X-Proofpoint-GUID: 6Ik6XAIrR4lbZJA9sA6FY0t21oQOnYt- X-Proofpoint-ORIG-GUID: V1czuJ3uWPBoAbWS72W3lae0uDhb6wqj X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1117,Hydra:6.1.9,FMLib:17.12.80.40 definitions=2025-09-29_02,2025-09-29_01,2025-03-28_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 malwarescore=0 suspectscore=0 bulkscore=0 lowpriorityscore=0 clxscore=1011 phishscore=0 priorityscore=1501 adultscore=0 spamscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2509150000 definitions=main-2509270010 This patch series implements build-time fixup of alternate feature relative addresses for powerpc. Previously, Nicholas Piggin proposed a build-time solution using a custom PowerPC tool [1], which provided the foundation for this approach. The current implementation leverages objtool's existing ELF parsing infrastructure to do the same. This patchset applies atop powerpc/merge branch. Links and History: [1] Original PowerPC tool approach: http://patchwork.ozlabs.org/project/linuxppc-dev/patch/20170521010130.13552-1-npiggin@gmail.com/ [2] Initial RFC v1: https://lore.kernel.org/linuxppc-dev/20240422092206.147078-1-sv@linux.ibm.com/T/#t [3] PowerPC instruction decoder borrowed from: https://lore.kernel.org/linuxppc-dev/bfa8364da047d8610a09458a1cd924a0566aedbb.1736955567.git.christophe.leroy@csgroup.eu/#Z31tools:objtool:arch:powerpc:decode.c Testing: Build and Boot tested on ppc64le, ppc64be, and ppc32be configs. Changes in V2: - Added implementation support for ppc64 LE, BE, ppc32 BE. Sathvika Vasireddy (3): objtool/powerpc: Enhance objtool to fixup alternate feature relative addresses kbuild: Add objtool integration for PowerPC feature fixups powerpc: Enable build-time feature fixup processing by default Makefile | 7 + arch/Kconfig | 3 + arch/powerpc/Kconfig | 3 + arch/powerpc/Makefile | 5 + arch/powerpc/include/asm/feature-fixups.h | 2 +- arch/powerpc/kernel/vmlinux.lds.S | 8 +- arch/powerpc/lib/feature-fixups.c | 12 - scripts/Makefile.lib | 5 +- scripts/Makefile.vmlinux | 13 +- tools/objtool/arch/powerpc/decode.c | 15 +- tools/objtool/arch/powerpc/special.c | 436 ++++++++++++++++++++++ tools/objtool/builtin-check.c | 2 + tools/objtool/check.c | 48 ++- tools/objtool/elf.c | 4 + tools/objtool/include/objtool/builtin.h | 1 + tools/objtool/include/objtool/special.h | 56 +++ 16 files changed, 593 insertions(+), 27 deletions(-) -- 2.43.0