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glibc/sysdeps/nptl/unwind-forcedunwind.c
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/* Copyright (C) 2003-2015 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 <gnu/lib-names.h> | |
#include <unwind-resume.h> | |
static void *libgcc_s_handle; | |
void (*__libgcc_s_resume) (struct _Unwind_Exception *exc) | |
attribute_hidden __attribute__ ((noreturn)); | |
static _Unwind_Reason_Code (*libgcc_s_personality) PERSONALITY_PROTO; | |
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 (__glibc_likely (libgcc_s_handle != NULL)) | |
{ | |
/* 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 | |
) | |
__libc_fatal (LIBGCC_S_SO " must be installed for pthread_cancel to work\n"); | |
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); | |
} | |
} | |
#if !HAVE_ARCH_UNWIND_RESUME | |
void | |
_Unwind_Resume (struct _Unwind_Exception *exc) | |
{ | |
if (__glibc_unlikely (libgcc_s_handle == NULL)) | |
pthread_cancel_init (); | |
else | |
atomic_read_barrier (); | |
void (*resume) (struct _Unwind_Exception *exc) = __libgcc_s_resume; | |
PTR_DEMANGLE (resume); | |
resume (exc); | |
} | |
#endif | |
_Unwind_Reason_Code | |
__gcc_personality_v0 PERSONALITY_PROTO | |
{ | |
if (__glibc_unlikely (libgcc_s_handle == NULL)) | |
pthread_cancel_init (); | |
else | |
atomic_read_barrier (); | |
__typeof (libgcc_s_personality) personality = libgcc_s_personality; | |
PTR_DEMANGLE (personality); | |
return (*personality) PERSONALITY_ARGS; | |
} | |
_Unwind_Reason_Code | |
_Unwind_ForcedUnwind (struct _Unwind_Exception *exc, _Unwind_Stop_Fn stop, | |
void *stop_argument) | |
{ | |
if (__glibc_unlikely (libgcc_s_handle == NULL)) | |
pthread_cancel_init (); | |
else | |
atomic_read_barrier (); | |
_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 (__glibc_unlikely (libgcc_s_handle == NULL)) | |
pthread_cancel_init (); | |
else | |
atomic_read_barrier (); | |
_Unwind_Word (*getcfa) (struct _Unwind_Context *) = libgcc_s_getcfa; | |
PTR_DEMANGLE (getcfa); | |
return getcfa (context); | |
} |