[Bug target/113874] GNU2 TLS descriptor calls do not follow psABI on x86_64-linux-gnu

["hjl.tools at gmail dot com" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113874

--- Comment #28 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to Jakub Jelinek from comment #27)
> (In reply to H.J. Lu from comment #26)
> > Even if I compile ia32 glibc with -march=skylake, the _dl_tlsdesc_dynamic
> > slow
> > path doesn't touch XMM registers at all.
> 
> I thought Florian said it can call malloc and malloc can be user provided
> and can use SSE2, 387/MMX or whatever other call clobbered registers ia32
> has.

[hjl@gnu-cfl-3 elf]$ readelf -rW ld.so

Relocation section '.rel.dyn' at offset 0x9f8 contains 3 entries:
 Offset     Info    Type                Sym. Value  Symbol's Name
00032fe0  00001a06 R_386_GLOB_DAT         00031ac0   __rseq_offset@@GLIBC_2.35
00032fe4  00001f06 R_386_GLOB_DAT         00031ac4   __rseq_size@@GLIBC_2.35
00032b20  0000002a R_386_IRELATIVE       

Relocation section '.relr.dyn' at offset 0xa10 contains 3 entries:
  12 offsets
00031a60
00032ed0
00032ed8
00032f04
00032f08
00032f0c
00032f10
00032f14
00032f18
00032f1c
00032f20
00032f24
[hjl@gnu-cfl-3 elf]$ 

You can't use another malloc for the ld.so internal usage of malloc/calloc.