/* Copyright (C) 2003, 2005, 2006, 2009 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 <http://www.gnu.org/licenses/>. */ #include <dlfcn.h> #include <stdio.h> #include <unwind.h> #include <pthreadP.h> #include <sysdep.h> #include <libgcc_s.h> #define __libc_dlopen(x) dlopen(x, (RTLD_LOCAL | RTLD_LAZY)) #define __libc_dlsym dlsym #define __libc_dlclose dlclose static void *libgcc_s_handle; static void (*libgcc_s_resume) (struct _Unwind_Exception *exc); static _Unwind_Reason_Code (*libgcc_s_personality) (int, _Unwind_Action, _Unwind_Exception_Class, struct _Unwind_Exception *, struct _Unwind_Context *); static _Unwind_Reason_Code (*libgcc_s_forcedunwind) (struct _Unwind_Exception *, _Unwind_Stop_Fn, void *); static _Unwind_Word (*libgcc_s_getcfa) (struct _Unwind_Context *); void __attribute_noinline__ pthread_cancel_init (void) { void *resume; void *personality; void *forcedunwind; void *getcfa; void *handle; if (__builtin_expect (libgcc_s_handle != NULL, 1)) { /* Force gcc to reload all values. */ __asm__ __volatile__ ("" ::: "memory"); return; } handle = __libc_dlopen (LIBGCC_S_SO); if (handle == NULL || (resume = __libc_dlsym (handle, "_Unwind_Resume")) == NULL || (personality = __libc_dlsym (handle, "__gcc_personality_v0")) == NULL || (forcedunwind = __libc_dlsym (handle, "_Unwind_ForcedUnwind")) == NULL || (getcfa = __libc_dlsym (handle, "_Unwind_GetCFA")) == NULL #ifdef ARCH_CANCEL_INIT || ARCH_CANCEL_INIT (handle) #endif ) { printf (LIBGCC_S_SO " must be installed for pthread_cancel to work\n"); abort(); } PTR_MANGLE (resume); libgcc_s_resume = resume; PTR_MANGLE (personality); libgcc_s_personality = personality; PTR_MANGLE (forcedunwind); libgcc_s_forcedunwind = forcedunwind; PTR_MANGLE (getcfa); libgcc_s_getcfa = getcfa; /* Make sure libgcc_s_handle is written last. Otherwise, pthread_cancel_init might return early even when the pointer the caller is interested in is not initialized yet. */ atomic_write_barrier (); libgcc_s_handle = handle; } void __libc_freeres_fn_section __unwind_freeres (void) { void *handle = libgcc_s_handle; if (handle != NULL) { libgcc_s_handle = NULL; __libc_dlclose (handle); } } void _Unwind_Resume (struct _Unwind_Exception *exc) { if (__builtin_expect (libgcc_s_handle == NULL, 0)) pthread_cancel_init (); void (*resume) (struct _Unwind_Exception *exc) = libgcc_s_resume; PTR_DEMANGLE (resume); resume (exc); } _Unwind_Reason_Code __gcc_personality_v0 (int version, _Unwind_Action actions, _Unwind_Exception_Class exception_class, struct _Unwind_Exception *ue_header, struct _Unwind_Context *context); _Unwind_Reason_Code __gcc_personality_v0 (int version, _Unwind_Action actions, _Unwind_Exception_Class exception_class, struct _Unwind_Exception *ue_header, struct _Unwind_Context *context) { if (__builtin_expect (libgcc_s_handle == NULL, 0)) pthread_cancel_init (); _Unwind_Reason_Code (*personality) (int, _Unwind_Action, _Unwind_Exception_Class, struct _Unwind_Exception *, struct _Unwind_Context *) = libgcc_s_personality; PTR_DEMANGLE (personality); return personality (version, actions, exception_class, ue_header, context); } _Unwind_Reason_Code _Unwind_ForcedUnwind (struct _Unwind_Exception *exc, _Unwind_Stop_Fn stop, void *stop_argument) { if (__builtin_expect (libgcc_s_handle == NULL, 0)) pthread_cancel_init (); _Unwind_Reason_Code (*forcedunwind) (struct _Unwind_Exception *, _Unwind_Stop_Fn, void *) = libgcc_s_forcedunwind; PTR_DEMANGLE (forcedunwind); return forcedunwind (exc, stop, stop_argument); } _Unwind_Word _Unwind_GetCFA (struct _Unwind_Context *context) { if (__builtin_expect (libgcc_s_handle == NULL, 0)) pthread_cancel_init (); _Unwind_Word (*getcfa) (struct _Unwind_Context *) = libgcc_s_getcfa; PTR_DEMANGLE (getcfa); return getcfa (context); }