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Tue, 5 May 2026 08:46:33 +0000 (GMT) From: Sathvika Vasireddy To: nathan@kernel.org, nsc@kernel.org, maddy@linux.ibm.com, mpe@ellerman.id.au, npiggin@gmail.com, chleroy@kernel.org, jpoimboe@kernel.org, peterz@infradead.org, ojeda@kernel.org, masahiroy@kernel.org, lossin@kernel.org, tamird@kernel.org, thomas.weissschuh@linutronix.de, rostedt@goodmis.org, ihor.solodrai@linux.dev, thuth@redhat.com, pmladek@suse.com, aliceryhl@google.com, elver@google.com, kees@kernel.org, legion@kernel.org, ardb@kernel.org, yuxuan.zuo@outlook.com, alexghiti@rivosinc.com, alexandre.chartre@oracle.com, bp@alien8.de, linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, sv@linux.ibm.com Subject: [PATCH v1 0/6] objtool: Fixup alternate feature relative addresses Date: Tue, 5 May 2026 14:16:22 +0530 Message-ID: <20260505084628.17940-1-sv@linux.ibm.com> X-Mailer: git-send-email 2.50.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Reinject: loops=2 maxloops=12 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNTA1MDA3OSBTYWx0ZWRfXyVA3d8v0trbM d7nkiFJsjKkGzeBpgKeLFu1VAwSrQfI3sUOMRYQ5Ecr1NyEZzPv+1NLwl5sACrZzFeL5DKoosV2 ycSD2yQTkF+pf6uyrkpwF9Ayee3x/7kC23kxyJZZwigYwtIcKI9UpSZ6yvLb7/gKpuE31zbW8rd nePAlTYzgMG/hqWbIZGLXQs9Ap1OGy/kaAT4OeMbPEU+jm7SnqtRG2mRjSnRz/yMLFuCCuet/Dr zahoIxz5MFbu/c/N0vWzYebVeC+dkHUhu/8FUpoj9nCNjT0UpNlTHnhq51SQY2MMzrkX0+1MIww s/P19W14p6SLyX3McO2uWee7kGloovat1ioLb3Uvv+Tz0SqVs5HMJQNkaQsaSNXmMHwyNzC9A0w JAIC3XqGrSs2maxRoA8OZUH0VfqDYwbWOA2TQgXvS8d1RGuy6lYy1E/kbxzIMyXWEFhOho8v0tF G/GgWlRD9hwWw8LZpBg== X-Proofpoint-GUID: Z9Zlm4gkl6emT9XnCkYhJmZ5Hd4YWJxK X-Proofpoint-ORIG-GUID: DWXbNVg7f_Y1MF2SOnkRAES5Xx0kuGIs X-Authority-Analysis: v=2.4 cv=eu/vCIpX c=1 sm=1 tr=0 ts=69f9ae74 cx=c_pps a=AfN7/Ok6k8XGzOShvHwTGQ==:117 a=AfN7/Ok6k8XGzOShvHwTGQ==:17 a=NGcC8JguVDcA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=iQ6ETzBq9ecOQQE5vZCe:22 a=voM4FWlXAAAA:8 a=pGLkceISAAAA:8 a=6NrjVYLyXoVgFYLQaH8A:9 a=IC2XNlieTeVoXbcui8wp:22 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-05-05_02,2026-04-30_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 phishscore=0 lowpriorityscore=0 clxscore=1011 adultscore=0 suspectscore=0 malwarescore=0 bulkscore=0 impostorscore=0 spamscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2604200000 definitions=main-2605050079 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. [1] Original PowerPC tool approach: http://patchwork.ozlabs.org/project/linuxppc-dev/patch/20170521010130.13552-1-npiggin@gmail.com/ Testing: Build and Boot tested on ppc64le, ppc64be, and ppc32be configs. Sathvika Vasireddy (6): objtool/powerpc: Add build-time fixup of alternate feature branch targets objtool: Set ELF_F_LAYOUT flag to preserve vmlinux segment layout objtool: Fix "can't find starting instruction" warnings on vmlinux objtool/powerpc: Skip jump destination analysis and unnanotated intra-function call warnings for --ftr-fixup kbuild: Add objtool integration for PowerPC feature fixups powerpc: Enable build-time feature fixup processing by default Makefile | 7 + 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 | 4 +- scripts/Makefile.vmlinux | 11 +- tools/objtool/arch/powerpc/decode.c | 15 +- tools/objtool/arch/powerpc/special.c | 451 ++++++++++++++++++++++ tools/objtool/builtin-check.c | 2 + tools/objtool/check.c | 57 ++- tools/objtool/elf.c | 4 + tools/objtool/include/objtool/builtin.h | 1 + tools/objtool/include/objtool/special.h | 56 +++ tools/objtool/special.c | 29 ++ 16 files changed, 637 insertions(+), 30 deletions(-) -- 2.43.0