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(localhost [IPv6:::1]) by gnu-cfl-3.localdomain (Postfix) with ESMTP id E39987402F4 for ; Sat, 6 Jan 2024 14:10:01 -0800 (PST) From: "H.J. Lu" To: binutils@sourceware.org Subject: [PATCH v2 0/2] Improve -z mark-plt Date: Sat, 6 Jan 2024 14:09:59 -0800 Message-ID: <20240106221001.1754844-1-hjl.tools@gmail.com> X-Mailer: git-send-email 2.43.0 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Spam-Status: No, score=-3013.0 required=5.0 tests=BAYES_00,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FREEMAIL_FROM,RCVD_IN_ABUSEAT,RCVD_IN_DNSWL_NONE,RCVD_IN_SBL_CSS,SPF_HELO_NONE,SPF_PASS,TXREP,T_SCC_BODY_TEXT_LINE autolearn=no autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org List-Id: Changes in v2: 1. Fix typos. It should be --enable-mark-plt, not --enable-make-plt. 2. Remove tests changes for -z mark-plt. Add --enable-mark-plt linker configure option to mark PLT entries with DT_X86_64_PLT, DT_X86_64_PLTSZ and DT_X86_64_PLTENT dynamic tags by default. When -z mark-plt is used to add DT_X86_64_PLT, DT_X86_64_PLTSZ and DT_X86_64_PLTENT, the r_addend field of the R_X86_64_JUMP_SLOT relocation stores the offset of the indirect branch instruction. However, glibc versions which don't have this commit in glibc 2.36: commit f8587a61892cbafd98ce599131bf4f103466f084 Author: H.J. Lu Date: Fri May 20 19:21:48 2022 -0700 x86-64: Ignore r_addend for R_X86_64_GLOB_DAT/R_X86_64_JUMP_SLOT According to x86-64 psABI, r_addend should be ignored for R_X86_64_GLOB_DAT and R_X86_64_JUMP_SLOT. Since linkers always set their r_addends to 0, we can ignore their r_addends. Reviewed-by: Fangrui Song won't ignore the r_addend value in the R_X86_64_JUMP_SLOT relocation. Although this commit has been backported to glibc 2.33/2.34/2.35 release branches, it is safer to require glibc 2.36 for such binaries. Extend the glibc version dependency of GLIBC_ABI_DT_RELR for DT_RELR to also add GLIBC_2.36 version dependency for -z mark-plt on the the shared C library if it provides a GLIBC_2.XX symbol version. H.J. Lu (2): elf: Add elf_backend_add_glibc_version_dependency ld: Add --enable-mark-plt configure option bfd/elf-bfd.h | 23 ++++ bfd/elf64-x86-64.c | 27 +++++ bfd/elflink.c | 146 +++++++++++++++----------- bfd/elfxx-target.h | 5 + ld/NEWS | 5 + ld/config.in | 4 + ld/configure | 26 ++++- ld/configure.ac | 17 +++ ld/emulparams/x86-64-plt.sh | 7 +- ld/emultempl/elf-x86.em | 17 +++ ld/testsuite/ld-x86-64/mark-plt-1a.rd | 7 ++ ld/testsuite/ld-x86-64/mark-plt-1b.rd | 7 ++ ld/testsuite/ld-x86-64/x86-64.exp | 14 +++ 13 files changed, 240 insertions(+), 65 deletions(-) create mode 100644 ld/testsuite/ld-x86-64/mark-plt-1a.rd create mode 100644 ld/testsuite/ld-x86-64/mark-plt-1b.rd -- 2.43.0