[Bug dynamic-link/29776] New: elf/tst-tlsopt-powerpc fails when compiled with -mcpu=power10

["fweimer at redhat dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=29776

            Bug ID: 29776
           Summary: elf/tst-tlsopt-powerpc fails when compiled with
                    -mcpu=power10
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: dynamic-link
          Assignee: unassigned at sourceware dot org
          Reporter: fweimer at redhat dot com
                CC: amodra at gmail dot com, rajis at linux dot ibm.com
  Target Milestone: ---
            Target: powerpc64le-linux-gnu

tls_get_addr_opt_test in sysdeps/powerpc/mod-tlsopt-powerpc.c contains:

#ifdef __powerpc64__
  register unsigned long thread_pointer __asm__ ("r13");
  asm ("addi %0,2,foo@got@tlsgd" : "=r" (tls_arg));
#else

If I'm not mistaken, this assumes that r2 is the TOC register. However, when
building in PCREL mode (e.g., with CC="gcc -mcpu=power10"), there is no TOC
register for this function. In fact, r2 is zero, and we get a crash for the
tls_arg->ti_module != 0 check.

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