1 /* __libc_siglongjmp for Linux/x86
2    Copyright (C) 2018-2021 Free Software Foundation, Inc.
3    This file is part of the GNU C Library.
4 
5    The GNU C Library is free software; you can redistribute it and/or
6    modify it under the terms of the GNU Lesser General Public
7    License as published by the Free Software Foundation; either
8    version 2.1 of the License, or (at your option) any later version.
9 
10    The GNU C Library is distributed in the hope that it will be useful,
11    but WITHOUT ANY WARRANTY; without even the implied warranty of
12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13    Lesser General Public License for more details.
14 
15    You should have received a copy of the GNU Lesser General Public
16    License along with the GNU C Library; if not, see
17    <https://www.gnu.org/licenses/>.  */
18 
19 #include <sysdeps/x86/longjmp.c>
20 
21 #include <pthreadP.h>
22 #include <jmp_buf-ssp.h>
23 
24 #ifdef __x86_64__
25 # define SHADOW_STACK_POINTER_SIZE 8
26 #else
27 # define SHADOW_STACK_POINTER_SIZE 4
28 #endif
29 
30 /* Assert that the priv field in struct pthread_unwind_buf has space
31    to store shadow stack pointer.  */
32 _Static_assert ((offsetof (struct pthread_unwind_buf, priv)
33                 <= SHADOW_STACK_POINTER_OFFSET)
34                && ((offsetof (struct pthread_unwind_buf, priv)
35                     + sizeof (((struct pthread_unwind_buf *) 0)->priv))
36                    >= (SHADOW_STACK_POINTER_OFFSET
37                        + SHADOW_STACK_POINTER_SIZE)),
38                "Shadow stack pointer is not within private storage "
39                "of pthread_unwind_buf.");
40