1 /* Copyright (C) 1991-2021 Free Software Foundation, Inc.
2    This file is part of the GNU C Library.
3 
4    The GNU C Library is free software; you can redistribute it and/or
5    modify it under the terms of the GNU Lesser General Public
6    License as published by the Free Software Foundation; either
7    version 2.1 of the License, or (at your option) any later version.
8 
9    The GNU C Library is distributed in the hope that it will be useful,
10    but WITHOUT ANY WARRANTY; without even the implied warranty of
11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
12    Lesser General Public License for more details.
13 
14    You should have received a copy of the GNU Lesser General Public
15    License along with the GNU C Library; if not, see
16    <https://www.gnu.org/licenses/>.  */
17 
18 #include <stddef.h>
19 #include <setjmp.h>
20 #include <signal.h>
21 #include <pthreadP.h>
22 #include <jmpbuf-unwind.h>
23 
24 extern void __sigstack_longjmp (__jmp_buf, int)
25      __attribute__ ((noreturn));
26 
27 /* Like __libc_siglongjmp(), but safe for crossing from alternate
28    signal stack to normal stack.  Needed by NPTL.  */
29 void
__libc_unwind_longjmp(sigjmp_buf env,int val)30 __libc_unwind_longjmp (sigjmp_buf env, int val)
31 {
32   /* Perform any cleanups needed by the frames being unwound.  */
33   __pthread_cleanup_upto (env->__jmpbuf, CURRENT_STACK_FRAME);
34 
35   if (env[0].__mask_was_saved)
36     /* Restore the saved signal mask.  */
37     __libc_signal_restore_set (&env[0].__saved_mask);
38 
39   /* Call the machine-dependent function to restore machine state.  */
40   __sigstack_longjmp (env[0].__jmpbuf, val ?: 1);
41 }
42 hidden_def (__libc_unwind_longjmp)
43