nptl: Move __pthread_unwind_next into libc

It's necessary to stub out __libc_disable_asynccancel and
__libc_enable_asynccancel via rtld-stubbed-symbols because the new
direct references to the unwinder result in symbol conflicts when the
rtld exception handling from libc is linked in during the construction
of librtld.map.

unwind-forcedunwind.c is merged into unwind-resume.c.  libc now needs
the functions that were previously only used in libpthread.

The GLIBC_PRIVATE exports of __libc_longjmp and __libc_siglongjmp are
no longer needed, so switch them to hidden symbols.

The symbol __pthread_unwind_next has been moved using
scripts/move-symbol-to-libc.py.

Reviewed-by: Adhemerva Zanella  <adhemerval.zanella@linaro.org>

1 files changed, 14 insertions, 0 deletions

diff --git a/sysdeps/generic/unwind-resume.c b/sysdeps/generic/unwind-resume.c
index 9e63762bf1..66dbb67e81 100644
--- a/sysdeps/generic/unwind-resume.c
+++ b/sysdeps/generic/unwind-resume.c
@@ -44,3 +44,17 @@ __gcc_personality_v0 PERSONALITY_PROTO
 {
   return UNWIND_LINK_PTR (link (), personality) PERSONALITY_ARGS;
 }
+
+_Unwind_Reason_Code
+_Unwind_ForcedUnwind (struct _Unwind_Exception *exc, _Unwind_Stop_Fn stop,
+                      void *stop_argument)
+{
+  return UNWIND_LINK_PTR (link (), _Unwind_ForcedUnwind)
+    (exc, stop, stop_argument);
+}
+
+_Unwind_Word
+_Unwind_GetCFA (struct _Unwind_Context *context)
+{
+  return UNWIND_LINK_PTR (link (), _Unwind_GetCFA) (context);
+}