1/* __libc_siglongjmp for x86.
2 Copyright (C) 2018-2022 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#define __libc_longjmp __redirect___libc_longjmp
20#include <setjmp/longjmp.c>
21#undef __libc_longjmp
22
23extern void __longjmp_cancel (__jmp_buf __env, int __val)
24 __attribute__ ((__noreturn__)) attribute_hidden;
25
26/* Since __libc_longjmp is a private interface for cancellation
27 implementation in libpthread, there is no need to restore shadow
28 stack register. */
29
30void
31__libc_longjmp (sigjmp_buf env, int val)
32{
33 /* Perform any cleanups needed by the frames being unwound. */
34 _longjmp_unwind (env, val);
35
36 if (env[0].__mask_was_saved)
37 /* Restore the saved signal mask. */
38 (void) __sigprocmask (SIG_SETMASK,
39 (sigset_t *) &env[0].__saved_mask,
40 (sigset_t *) NULL);
41
42 /* Call the machine-dependent function to restore machine state
43 without shadow stack. */
44 __longjmp_cancel (env[0].__jmpbuf, val ?: 1);
45}
46

source code of glibc/sysdeps/x86/longjmp.c