Re: [musl] loongarch64 merge

[Fangrui Song <i@maskray.me>]

On Thu, Jan 25, 2024 at 9:43 AM Rich Felker <dalias@libc.org> wrote:
>
> I'm going through where everything was left on this topic and
> preparing a patch for merge. This message/thread is to document what
> I'm actually doing vs the various submitted versions of the patch
> since v5/v6 where the major review took place.
>
>
> Subsequent changes I'm reverting:
>
> - De-optimization of __get_tp. No motivation for removing the
>   potentially in-place $tp was provided, and we generally use the
>   arch's tp in-place unless there's a compiler bug to be worked
>   around. See powerpc{,64} for an example where it's used, or1k where
>   we have a probably-obsolete workaround for ancient clang being
>   broken.
>
> - unsigned -> unsigned int, etc.
>
> - Gratuitous whitespace changes in headers that obscure the fact that
>   a header is a complete duplicate that could eventually be shared
>   between archs (e.g. bits/float.h, bits/posix.h) or just obscure
>   what differs from other archs when running diff.
>
>
> Fixes from previous review that were overlooked:
>
> - Removing SA_RESTORER -- its presence defined as 0 produces wrong
>   sigaction ABI.
>
>
> Additions:
>
> - Adding the reloc.h/configure case for single-only float.
>
> - The new member names for mcontext_t are all in reserved namespace,
>   so there's no reason to have a separate namespace-clean version of
>   mcontext_t, and I'm removing the latter.
>
> - Public member uc_flags with no __, macro for compat with any
>   existing software using the __-prefixed name.
>
>
> Still TODO:
>
> I don't think I ever reviewed the apparent rewrite of sigsetjmp and
> possibly some other asm that changed between v5 and v8. I'm about to
> start looking at that and will follow up.
>
>
> Attached are a "differences vs v8" patch and what my cumulative patch
> looks like right now.
>
> Rich

There are a few new relocation types, including R_LARCH_ALIGN (102),
some ULEB128 ones, and some TLSDESC ones.

https://github.com/loongson/la-abi-specs/blob/release/laelf.adoc