sysdeps/gnu/unwind-resume.c

   1 /* Copyright (C) 2003-2015 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Jakub Jelinek <jakub@redhat.com>.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public License as
   7    published by the Free Software Foundation; either version 2.1 of the
   8    License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; see the file COPYING.LIB.  If
  17    not, see <http://www.gnu.org/licenses/>.  */
  18
  19 #include <dlfcn.h>
  20 #include <stdio.h>
  21 #include <unwind.h>
  22 #include <gnu/lib-names.h>
  23 #include <sysdep.h>
  24
  25 static void (*libgcc_s_resume) (struct _Unwind_Exception *exc)
  26   __attribute__ ((noreturn));
  27 static _Unwind_Reason_Code (*libgcc_s_personality)
  28   (int, _Unwind_Action, _Unwind_Exception_Class, struct _Unwind_Exception *,
  29    struct _Unwind_Context *);
  30
  31 static void
  32 init (void)
  33 {
  34   void *resume, *personality;
  35   void *handle;
  36
  37   handle = __libc_dlopen (LIBGCC_S_SO);
  38
  39   if (handle == NULL
  40       || (resume = __libc_dlsym (handle, "_Unwind_Resume")) == NULL
  41       || (personality = __libc_dlsym (handle, "__gcc_personality_v0")) == NULL)
  42     __libc_fatal (LIBGCC_S_SO
  43                   " must be installed for pthread_cancel to work\n");
  44
  45   PTR_MANGLE (resume);
  46   libgcc_s_resume = resume;
  47   PTR_MANGLE (personality);
  48   libgcc_s_personality = personality;
  49 }
  50
  51 void
  52 _Unwind_Resume (struct _Unwind_Exception *exc)
  53 {
  54   if (__glibc_unlikely (libgcc_s_resume == NULL))
  55     init ();
  56
  57   __typeof (libgcc_s_resume) resume = libgcc_s_resume;
  58   PTR_DEMANGLE (resume);
  59   (*resume) (exc);
  60 }
  61
  62 _Unwind_Reason_Code
  63 __gcc_personality_v0 (int version, _Unwind_Action actions,
  64                       _Unwind_Exception_Class exception_class,
  65                       struct _Unwind_Exception *ue_header,
  66                       struct _Unwind_Context *context)
  67 {
  68   if (__glibc_unlikely (libgcc_s_personality == NULL))
  69     init ();
  70
  71   __typeof (libgcc_s_personality) personality = libgcc_s_personality;
  72   PTR_DEMANGLE (personality);
  73
  74   return (*personality) (version, actions, exception_class, ue_header, context);
  75 }