CVS commit: src

["Taylor R Campbell" <riastradh%netbsd.org@localhost>]

Module Name:    src
Committed By:   riastradh
Date:           Fri May  2 23:03:16 UTC 2025

Modified Files:
        src/libexec/ld.elf_so: headers.c reloc.c rtld.h
        src/tests/libexec/ld.elf_so: t_r_rel.sh

Log Message:
ld.elf_so: Implement RELR relocations.

The SHT_RELR-type .relr.dyn section, pointed to by the DT_RELR
dynamic tag, holds compressed R_*_RELATIVE-type relocations,
substantially reducing the disk space occupied by many programs.

This commit adds support in ld.elf_so for relocating dynamically
linked executables with RELR relocations.

Reference:

Rahul Chaudhry, `Re: Proposal for a new section type SHT_RELR',
generic-abi mailing list, 2018-02-07.

https://groups.google.com/g/generic-abi/c/bX460iggiKg/m/Jnz1lgLJAgAJ
https://web.archive.org/web/20241213012330/https://groups.google.com/g/generic-abi/c/bX460iggiKg/m/Jnz1lgLJAgAJ

Proposed on tech-userlevel:
https://mail-index.NetBSD.org/tech-userlevel/2025/04/27/msg014727.html

PR bin/59360: ld.elf_so(8): missing RELR support


To generate a diff of this commit:
cvs rdiff -u -r1.74 -r1.75 src/libexec/ld.elf_so/headers.c
cvs rdiff -u -r1.119 -r1.120 src/libexec/ld.elf_so/reloc.c
cvs rdiff -u -r1.148 -r1.149 src/libexec/ld.elf_so/rtld.h
cvs rdiff -u -r1.1 -r1.2 src/tests/libexec/ld.elf_so/t_r_rel.sh

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.