[go] debug/elf: sync new LoongArch relocation types up to ELF psABI v20250521

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abner chenc (Gerrit)

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Nov 17, 2025, 8:00:52 PM (4 days ago) Nov 17

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Change information

Commit message:

debug/elf: sync new loong64 relocation types up to LoongArch ELF psABI v20250521

Add several new relocation types defined in newer versions of LoongArch
ELF psABI v20250521, part of the v2.40 spec bundle. The new relocations
are seeing increased adoption because distributions are moving to newer
GNU/LLVM toolchain versions, so Go's internal linker must be prepared to
handle some of them, especially R_LARCH_CALL36 because the ecosystem is
slowly migrating to the "medium" code model by default.

The constants R_LARCH_DELETE and R_LARCH_CFA were removed in LoongArch
ELF psABI v20231102 (spec bundle v2.20), but they are already part of
the public API, so they are retained for now for upholding the go1
compatibility guarantee.

Corresponding binutils implementation:

* R_LARCH_CALL36: https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=dc5f359ed6a36d2c895d89c3e4886f3a2b6d9232
* TLSDESC: https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=26265e7fdf19d461563388495b6799eb3719f80a
* TLS {LD,GD,DESC} relaxation: https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=ae296cc45258b95223210263d1b91115e84beb56
* TLS LE relaxation: https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=775dead218e12e3fb94481c7a99aa0238d6a9138

Updates #75562

See: https://github.com/loongson/la-abi-specs/blob/v2.40/laelf.adoc

See: https://github.com/loongson-community/discussions/issues/43

Change-Id: Ib023e0b6becc0862d27afc419d3eb84c737359db

Reviewed-on: https://go-review.googlesource.com/c/go/+/709716

Reviewed-by: Mark Freeman <markf...@google.com>

Reviewed-by: Meidan Li <lime...@loongson.cn>

Reviewed-by: abner chenc <chen...@loongson.cn>

LUCI-TryBot-Result: Go LUCI <golang...@luci-project-accounts.iam.gserviceaccount.com>

Reviewed-by: Junyang Shao <shaoj...@google.com>

Reviewed-by: sophie zhao <zhaox...@loongson.cn>

Files:

A api/next/75562.txt
A doc/next/6-stdlib/99-minor/debug/elf/75562.md
M src/debug/elf/elf.go
M src/debug/elf/elf_test.go

Change size: M

Delta: 4 files changed, 81 insertions(+), 0 deletions(-)

Branch: refs/heads/master

Submit Requirements:

Code-Review: +2 by abner chenc, +1 by Junyang Shao, +1 by Mark Freeman, +1 by sophie zhao, +1 by Meidan Li
TryBots-Pass: LUCI-TryBot-Result+1 by Go LUCI

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