Move sysdeps/gnu/unwind-resume.c to sysdeps/generic/unwind-resume.c

This change allows architecture-specific sysdeps directories to override
it.

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

sysdeps/generic/unwind-resume.c

@@ -0,0 +1,83 @@
+/* Copyright (C) 2003-2021 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Jakub Jelinek <jakub@redhat.com>.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   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 <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)
+{
+  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;
+}
+
+#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);
+}
+#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;
+}