dlclose and TLS

[Steven Munroe]

Ulrich Drepper writes:

 > I've checked in some code to fix dlclose of modules with static TLS
 > for TLS_TCB_AT_TP platforms.  The existing code was completely broken
 > but I thnk it should more or less work for TLS_DTV_AT_TP platforms.

As of this morning ppc and ppc64 linuxthreads are working but nplt is 
not. At the moment nptl-0.36 is out sync with glibc at cvs head.

The problem I fould was that (at glibc cvs head) TLS_TCB_SIZE (defined 
as 0) was removed from the TLS_TPREL_VALUE calculation (in 
sysdeps/powerpc/dl-tls.h). To compensate the size of tcbhead_t was 
rolled into TLS_PRE_TCB_SIZE (in linuxthreads/sysdeps/powerpc/tls.h). 
Also dtv addressing was changed to use (TCBP)[-1].dtv.

The nptl sysdeps/powerpc/tls.h is still using the old definition 
(TLS_PRE_TCB_SIZE does not include sizeof(tcbhead_t)) so all TPREL 
relocations are off by sizeof(tcbhead_t).

Unfortunately my attemps so far (by either changing powerpc/dl-tls.h 
(add TLS_TCB_SIZE back) or nptl's powerpc/tls.h (make it look like 
linuxthreads powerpc/tls.h) have successed in getting ppc32/64 nptl 
working. There seems to be dependences in glibc for TLS_TCB_SIZE to be 0 
and in nptl-0.36 for it to be sizeof(tcbhead_t)

Is anyone else working on the corresponing nptl changes?

If not what are the generic glibc dependences on TLS_TCB_SIZE and 
TLS_PRE_TCB_SIZE for TLS_DTV_AT_TP platforms?



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