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- /* Copyright (C) 2003, 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,
- write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA. */
- #include <dlfcn.h>
- #include <stdio.h>
- #include <unwind.h>
- #include <pthreadP.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 *);
- static void (*libgcc_s_sjlj_register) (struct SjLj_Function_Context *);
- static void (*libgcc_s_sjlj_unregister) (struct SjLj_Function_Context *);
- void
- __attribute_noinline__
- pthread_cancel_init (void)
- {
- void *resume, *personality, *forcedunwind, *getcfa;
- void *handle;
- void *sjlj_register, *sjlj_unregister;
- if (__builtin_expect (libgcc_s_handle != NULL, 1))
- {
- /* Force gcc to reload all values. */
- asm volatile ("" ::: "memory");
- return;
- }
- handle = __libc_dlopen ("libgcc_s.so.1");
- if (handle == NULL
- || (sjlj_register = __libc_dlsym (handle, "_Unwind_SjLj_Register")) == NULL
- || (sjlj_unregister = __libc_dlsym (handle, "_Unwind_SjLj_Unregister")) == NULL
- || (resume = __libc_dlsym (handle, "_Unwind_SjLj_Resume")) == NULL
- || (personality = __libc_dlsym (handle, "__gcc_personality_sj0")) == NULL
- || (forcedunwind = __libc_dlsym (handle, "_Unwind_SjLj_ForcedUnwind"))
- == NULL
- || (getcfa = __libc_dlsym (handle, "_Unwind_GetCFA")) == NULL
- )
- fprintf(stderr, "libgcc_s.so.1 must be installed for pthread_cancel to work\n");
- libgcc_s_resume = resume;
- libgcc_s_personality = personality;
- libgcc_s_forcedunwind = forcedunwind;
- libgcc_s_sjlj_register = sjlj_register;
- libgcc_s_sjlj_unregister = sjlj_unregister;
- libgcc_s_getcfa = getcfa;
- /* Make sure libgcc_s_getcfa 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_resume == NULL, 0))
- pthread_cancel_init ();
- libgcc_s_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)
- {
- if (__builtin_expect (libgcc_s_personality == NULL, 0))
- pthread_cancel_init ();
- return libgcc_s_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_forcedunwind == NULL, 0))
- pthread_cancel_init ();
- return libgcc_s_forcedunwind (exc, stop, stop_argument);
- }
- _Unwind_Word
- _Unwind_GetCFA (struct _Unwind_Context *context)
- {
- if (__builtin_expect (libgcc_s_getcfa == NULL, 0))
- pthread_cancel_init ();
- return libgcc_s_getcfa (context);
- }
- void
- _Unwind_SjLj_Register (struct SjLj_Function_Context *fc)
- {
- if (__builtin_expect (libgcc_s_sjlj_register == NULL, 0))
- pthread_cancel_init ();
- libgcc_s_sjlj_register (fc);
- }
- void
- _Unwind_SjLj_Unregister (struct SjLj_Function_Context *fc)
- {
- if (__builtin_expect (libgcc_s_sjlj_unregister == NULL, 0))
- pthread_cancel_init ();
- libgcc_s_sjlj_unregister (fc);
- }
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