a3dd959229
The LoongArch ELF psABI v2 [1] relocs are vastly simplified from the v1 which involved a stack machine for computing the reloc values, but the details of PC-relative addressing are changed as well. Specifically, the `pcaddu12i` instruction is substituted with the `pcalau12i`, which is like arm64's `adrp` -- meaning the lower bits of a symbol's address now have to be absolute and not PC-relative. However, apart from the little bit of added complexity, the obvious advantage is that only 1 reloc needs to be emitted for every kind of external reloc we care about. This can mean substantial space savings (each RELA reloc occupies 24 bytes), and no open-coded stack ops has to remain any more. While at it, update the preset value for the output ELF's flags to indicate the psABI update. Fixes #58784 [1]: https://loongson.github.io/LoongArch-Documentation/LoongArch-ELF-ABI-EN.html Change-Id: I5c13bc710eaf58293a32e930dd33feff2ef14c28 Reviewed-on: https://go-review.googlesource.com/c/go/+/455017 Run-TryBot: Ben Shi <powerman1st@163.com> Reviewed-by: xiaodong liu <teaofmoli@gmail.com> Reviewed-by: abner chenc <chenguoqi@loongson.cn> Run-TryBot: Ian Lance Taylor <iant@google.com> Reviewed-by: Meidan Li <limeidan@loongson.cn> Auto-Submit: Ian Lance Taylor <iant@google.com> TryBot-Result: Gopher Robot <gobot@golang.org> Reviewed-by: Cherry Mui <cherryyz@google.com> Reviewed-by: Ian Lance Taylor <iant@google.com> |
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