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authorFangrui Song <maskray@google.com>2022-03-08 17:17:05 -0800
committerFangrui Song <maskray@google.com>2022-03-08 17:17:05 -0800
commit1c6cc29baf9a4c7129ab2e94b0d4022bfa4f3299 (patch)
tree008312335cd84ecfcc73c38b72ba836d06e3ca2f /db/db.h
parentedc696a73a7cb07b1aa68792a845a98d036ee7eb (diff)
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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.
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