1 /* Copyright (C) 2001-2024 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
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.
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.
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/>. */
20 extern int __getcontext (ucontext_t
*ucp
);
21 extern int __setcontext (const ucontext_t
*ucp
, int restoremask
);
24 __swapcontext (ucontext_t
*oucp
, const ucontext_t
*ucp
)
26 extern void __swapcontext_ret (void);
27 /* Save the current machine context to oucp. */
29 /* Modify oucp to skip the __setcontext call on reactivation. */
30 oucp
->uc_mcontext
.mc_gregs
[MC_PC
] = (long) __swapcontext_ret
;
31 oucp
->uc_mcontext
.mc_gregs
[MC_NPC
] = ((long) __swapcontext_ret
) + 4;
32 /* Restore the machine context in ucp. */
33 __setcontext (ucp
, 1);
39 .type __swapcontext_ret, #function \n\
40 __swapcontext_ret: \n\
43 .size __swapcontext_ret, .-__swapcontext_ret \n\
46 weak_alias (__swapcontext
, swapcontext
)