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author | Fangrui Song <maskray@google.com> | 2022-03-08 17:17:05 -0800 |
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committer | Fangrui Song <maskray@google.com> | 2022-03-08 17:17:05 -0800 |
commit | 1c6cc29baf9a4c7129ab2e94b0d4022bfa4f3299 (patch) | |
tree | 008312335cd84ecfcc73c38b72ba836d06e3ca2f /db/db.h | |
parent | edc696a73a7cb07b1aa68792a845a98d036ee7eb (diff) | |
download | glibc-maskray/relr.tar.gz glibc-maskray/relr.tar.xz glibc-maskray/relr.zip |
elf: Support DT_RELR relative relocation format [BZ #27924] maskray/relr
PIE and shared objects usually have many relative relocations. In 2017/2018, SHT_RELR/DT_RELR was proposed on https://groups.google.com/g/generic-abi/c/bX460iggiKg/m/GxjM0L-PBAAJ ("Proposal for a new section type SHT_RELR") and is a pre-standard. RELR usually takes 3% or smaller space than R_*_RELATIVE relocations. The virtual memory size of a mostly statically linked PIE is typically 5~10% smaller. This patch adds ELF_DYNAMIC_DO_RELR to ELF_DYNAMIC_RELOCATE. ELF_DYNAMIC_DO_RELR is ordered before ELF_DYNAMIC_DO_REL[A] so that ifunc resolvers that require relocated got entries have them relocated. This is needed for ppc64 according to Alan Modra.
Diffstat (limited to 'db/db.h')
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