On 12/19/18 7:59 AM, Florian Weimer wrote: > * Richard Biener: > >> Sure, if we'd ever deploy this in production placing this in the >> TCB for glibc targets might be beneifical. But as said the >> current implementation was just an experiment intended to be >> maximum portable. I suppose the dynamic loader takes care >> of initializing the TCB data? > > Yes, the dynamic linker will initialize it. If you need 100% reliable > initialization with something that is not zero, it's going to be tricky > though. Initial-exec TLS memory has this covered, but in the TCB, we > only have zeroed-out reservations today.
We have non-zero initialized TCB entries on powerpc*-linux which are used for the GCC __builtin_cpu_is() and __builtin_cpu_supports() builtin functions. Tulio would know the magic that was used to get them setup. Peter
