Implement _Unwind_Resume in libc on top of <unwind-link.h>

Temporarily move the arm _Unwind_Resume implementation to the file
used by libpthread.  It will be ported to <unwind-link.h> along with
the rest of nptl.

Reviewed-by: Carlos O'Donell <carlos@redhat.com>

1 files changed, 9 insertions, 46 deletions

diff --git a/sysdeps/generic/unwind-resume.c b/sysdeps/generic/unwind-resume.c
index 09533d6992..9e63762bf1 100644
--- a/sysdeps/generic/unwind-resume.c
+++ b/sysdeps/generic/unwind-resume.c
@@ -16,68 +16,31 @@
    License along with the GNU C Library; see the file COPYING.LIB.  If
    not, see <https://www.gnu.org/licenses/>.  */
 
-#include <dlfcn.h>
 #include <stdio.h>
-#include <unwind.h>
 #include <gnu/lib-names.h>
+#include <unwind-link.h>
 #include <sysdep.h>
 #include <unwind-resume.h>
 
-
-void (*__libgcc_s_resume) (struct _Unwind_Exception *exc)
-  attribute_hidden __attribute__ ((noreturn));
-
-static _Unwind_Reason_Code (*libgcc_s_personality) PERSONALITY_PROTO;
-
-void attribute_hidden __attribute__ ((cold))
-__libgcc_s_init (void)
+static struct unwind_link *
+link (void)
 {
-  void *resume, *personality;
-  void *handle;
-
-  /* See include/dlfcn.h. Use of __libc_dlopen requires RTLD_NOW.  */
-  handle = __libc_dlopen (LIBGCC_S_SO);
-
-  if (handle == NULL
-      || (resume = __libc_dlsym (handle, "_Unwind_Resume")) == NULL
-      || (personality = __libc_dlsym (handle, "__gcc_personality_v0")) == NULL)
-    __libc_fatal (LIBGCC_S_SO
-                  " must be installed for unwinding to work\n");
-
-#ifdef PTR_MANGLE
-  PTR_MANGLE (resume);
-#endif
-  __libgcc_s_resume = resume;
-#ifdef PTR_MANGLE
-  PTR_MANGLE (personality);
-#endif
-  libgcc_s_personality = personality;
+  struct unwind_link *unwind_link = __libc_unwind_link_get ();
+  if (unwind_link == NULL)
+    __libc_fatal (LIBGCC_S_SO " must be installed for unwinding to work\n");
+  return unwind_link;
 }
 
 #if !HAVE_ARCH_UNWIND_RESUME
 void
 _Unwind_Resume (struct _Unwind_Exception *exc)
 {
-  if (__glibc_unlikely (__libgcc_s_resume == NULL))
-    __libgcc_s_init ();
-
-  __typeof (__libgcc_s_resume) resume = __libgcc_s_resume;
-#ifdef PTR_DEMANGLE
-  PTR_DEMANGLE (resume);
-#endif
-  (*resume) (exc);
+  UNWIND_LINK_PTR (link (), _Unwind_Resume) (exc);
 }
 #endif
 
 _Unwind_Reason_Code
 __gcc_personality_v0 PERSONALITY_PROTO
 {
-  if (__glibc_unlikely (libgcc_s_personality == NULL))
-    __libgcc_s_init ();
-
-  __typeof (libgcc_s_personality) personality = libgcc_s_personality;
-#ifdef PTR_DEMANGLE
-  PTR_DEMANGLE (personality);
-#endif
-  return (*personality) PERSONALITY_ARGS;
+  return UNWIND_LINK_PTR (link (), personality) PERSONALITY_ARGS;
 }