diff options
Diffstat (limited to 'libpthread/nptl/sysdeps/unix/sysv/linux/arm/unwind-forcedunwind.c')
-rw-r--r-- | libpthread/nptl/sysdeps/unix/sysv/linux/arm/unwind-forcedunwind.c | 149 |
1 files changed, 149 insertions, 0 deletions
diff --git a/libpthread/nptl/sysdeps/unix/sysv/linux/arm/unwind-forcedunwind.c b/libpthread/nptl/sysdeps/unix/sysv/linux/arm/unwind-forcedunwind.c new file mode 100644 index 000000000..d095d3083 --- /dev/null +++ b/libpthread/nptl/sysdeps/unix/sysv/linux/arm/unwind-forcedunwind.c @@ -0,0 +1,149 @@ +/* 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); +} |