1 /* Save and set current context.
2 Copyright (C) 2022-2023 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
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.
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.
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/>. */
19 #include "ucontext-macros.h"
21 /* int swapcontext (ucontext_t *oucp, const ucontext_t *ucp) */
24 ori a2, sp, 0 /* Save sp to a2 */
29 SAVE_INT_REG (ra, 1, a0)
30 SAVE_INT_REG (a2, 3, a0) /* Store sp */
31 SAVE_INT_REG (zero, 4, a0) /* return 0 by overwriting a0 */
32 SAVE_INT_REG (x, 21, a0)
33 SAVE_INT_REG (fp, 22, a0)
34 SAVE_INT_REG (s0, 23, a0)
35 SAVE_INT_REG (s1, 24, a0)
36 SAVE_INT_REG (s2, 25, a0)
37 SAVE_INT_REG (s3, 26, a0)
38 SAVE_INT_REG (s4, 27, a0)
39 SAVE_INT_REG (s5, 28, a0)
40 SAVE_INT_REG (s6, 29, a0)
41 SAVE_INT_REG (s7, 30, a0)
42 SAVE_INT_REG (s8, 31, a0)
44 st.d ra, a0, MCONTEXT_PC
46 /* rt_sigprocmask (SIG_SETMASK, &ucp->uc_sigmask, &oucp->uc_sigmask, _NSIG8) */
48 li.d a2, UCONTEXT_SIGMASK
50 li.d a1, UCONTEXT_SIGMASK
54 li.d a7, SYS_ify (rt_sigprocmask)
59 ld.d t0, sp, 0 /* Load a1 to t0 */
61 /* Note the contents of argument registers will be random
62 unless makecontext() has been called. */
63 RESTORE_INT_REG (ra, 1, t0)
64 RESTORE_INT_REG (sp, 3, t0)
65 RESTORE_INT_REG (a0, 4, t0)
66 RESTORE_INT_REG (a1, 5, t0)
67 RESTORE_INT_REG (a2, 6, t0)
68 RESTORE_INT_REG (a3, 7, t0)
69 RESTORE_INT_REG (a4, 8, t0)
70 RESTORE_INT_REG (a5, 9, t0)
71 RESTORE_INT_REG (a6, 10, t0)
72 RESTORE_INT_REG (a7, 11, t0)
73 RESTORE_INT_REG (x, 21, t0)
74 RESTORE_INT_REG (fp, 22, t0)
75 RESTORE_INT_REG (s0, 23, t0)
76 RESTORE_INT_REG (s1, 24, t0)
77 RESTORE_INT_REG (s2, 25, t0)
78 RESTORE_INT_REG (s3, 26, t0)
79 RESTORE_INT_REG (s4, 27, t0)
80 RESTORE_INT_REG (s5, 28, t0)
81 RESTORE_INT_REG (s6, 29, t0)
82 RESTORE_INT_REG (s7, 30, t0)
83 RESTORE_INT_REG (s8, 31, t0)
85 ld.d t1, t0, MCONTEXT_PC
93 PSEUDO_END (__swapcontext)
95 weak_alias (__swapcontext, swapcontext)