[Bug libc/21895] New: ppc64 setjmp/longjmp not fully interoperable with static dlopen

["amonakov at gmail dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=21895

            Bug ID: 21895
           Summary: ppc64 setjmp/longjmp not fully interoperable with
                    static dlopen
           Product: glibc
           Version: unspecified
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: amonakov at gmail dot com
                CC: drepper.fsp at gmail dot com
  Target Milestone: ---

Created attachment 10311
  --> https://sourceware.org/bugzilla/attachment.cgi?id=10311&action=edit
testcase

On PowerPC64, implementations of setjmp and longjmp in Glibc save/restore
caller's saved TOC at ($r1+24) if compiled for shared libc.so, but not for
static libc.a.  However, since static dlopen is supported, a situation may
arise when libc.a longjmp is returning to a call site of libc.so setjmp; in
that case caller's saved TOC at ($r1+24) is not restored and the caller may
segfault. The attached testcase demonstrates this issue.

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