https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120002
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|FIXED |INVALID
--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
.LC0:
.xword hidden_symbol+65537
Is still valid for all shared libraries.
The problem is you want a DSO with no dynamic relocations but that won't work
here.
If you want that you should do the similar thing as what the 32bit compat does
for a similar reasons:
```
static __always_inline const struct vdso_time_data
*__arch_get_vdso_u_time_data(void)
{
const struct vdso_time_data *ret;
/*
* This simply puts &_vdso_time_data into ret. The reason why we don't
use
* `ret = _vdso_time_data` is that the compiler tends to optimise this
in a
* very suboptimal way: instead of keeping &_vdso_time_data in a
register,
* it goes through a relocation almost every time _vdso_time_data must
be
* accessed (even in subfunctions). This is both time and space
* consuming: each relocation uses a word in the code section, and it
* has to be loaded at runtime.
*
* This trick hides the assignment from the compiler. Since it cannot
* track where the pointer comes from, it will only use one relocation
* where __aarch64_get_vdso_u_time_data() is called, and then keep the
* result in a register.
*/
asm volatile("mov %0, %1" : "=r"(ret) : "r"(&vdso_u_time_data));
return ret;
}
```
