1/* Save and set current context.
2   Copyright (C) 2009-2022 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#include "ucontext-macros.h"
20
21/* int swapcontext (ucontext_t *oucp, const ucontext_t *ucp) */
22
23LEAF (__swapcontext)
24	mv	t0, a1			/* Save ucp into t0.  */
25
26	SAVE_INT_REG (ra,   0, a0)
27	SAVE_INT_REG (ra,   1, a0)
28	SAVE_INT_REG (sp,   2, a0)
29	SAVE_INT_REG (s0,   8, a0)
30	SAVE_INT_REG (s1,   9, a0)
31	SAVE_INT_REG (x0,  10, a0)	/* return 0 by overwriting a0.  */
32	SAVE_INT_REG (s2,  18, a0)
33	SAVE_INT_REG (s3,  19, a0)
34	SAVE_INT_REG (s4,  20, a0)
35	SAVE_INT_REG (s5,  21, a0)
36	SAVE_INT_REG (s6,  22, a0)
37	SAVE_INT_REG (s7,  23, a0)
38	SAVE_INT_REG (s8,  24, a0)
39	SAVE_INT_REG (s9,  25, a0)
40	SAVE_INT_REG (s10, 26, a0)
41	SAVE_INT_REG (s11, 27, a0)
42
43#ifndef __riscv_float_abi_soft
44	frsr a1
45
46	SAVE_FP_REG (fs0,   8, a0)
47	SAVE_FP_REG (fs1,   9, a0)
48	SAVE_FP_REG (fs2,  18, a0)
49	SAVE_FP_REG (fs3,  19, a0)
50	SAVE_FP_REG (fs4,  20, a0)
51	SAVE_FP_REG (fs5,  21, a0)
52	SAVE_FP_REG (fs6,  22, a0)
53	SAVE_FP_REG (fs7,  23, a0)
54	SAVE_FP_REG (fs8,  24, a0)
55	SAVE_FP_REG (fs9,  25, a0)
56	SAVE_FP_REG (fs10, 26, a0)
57	SAVE_FP_REG (fs11, 27, a0)
58
59	sw	a1, MCONTEXT_FSR(a0)
60#endif /* __riscv_float_abi_soft */
61
62/* rt_sigprocmask (SIG_SETMASK, &ucp->uc_sigmask, &oucp->uc_sigmask, _NSIG8) */
63	li	a3, _NSIG8
64	add	a2, a0, UCONTEXT_SIGMASK
65	add     a1, t0, UCONTEXT_SIGMASK
66	li	a0, SIG_SETMASK
67
68	li	a7, SYS_ify (rt_sigprocmask)
69	scall
70
71	bltz	a0, 99f
72
73#ifndef __riscv_float_abi_soft
74	lw	t1, MCONTEXT_FSR(t0)
75
76	RESTORE_FP_REG (fs0,   8, t0)
77	RESTORE_FP_REG (fs1,   9, t0)
78	RESTORE_FP_REG (fs2,  18, t0)
79	RESTORE_FP_REG (fs3,  19, t0)
80	RESTORE_FP_REG (fs4,  20, t0)
81	RESTORE_FP_REG (fs5,  21, t0)
82	RESTORE_FP_REG (fs6,  22, t0)
83	RESTORE_FP_REG (fs7,  23, t0)
84	RESTORE_FP_REG (fs8,  24, t0)
85	RESTORE_FP_REG (fs9,  25, t0)
86	RESTORE_FP_REG (fs10, 26, t0)
87	RESTORE_FP_REG (fs11, 27, t0)
88
89	fssr	t1
90#endif /* __riscv_float_abi_soft */
91
92	/* Note the contents of argument registers will be random
93	   unless makecontext() has been called.  */
94	RESTORE_INT_REG (t1,   0, t0)
95	RESTORE_INT_REG (ra,   1, t0)
96	RESTORE_INT_REG (sp,   2, t0)
97	RESTORE_INT_REG (s0,   8, t0)
98	RESTORE_INT_REG (s1,   9, t0)
99	RESTORE_INT_REG (a0,  10, t0)
100	RESTORE_INT_REG (a1,  11, t0)
101	RESTORE_INT_REG (a2,  12, t0)
102	RESTORE_INT_REG (a3,  13, t0)
103	RESTORE_INT_REG (a4,  14, t0)
104	RESTORE_INT_REG (a5,  15, t0)
105	RESTORE_INT_REG (a6,  16, t0)
106	RESTORE_INT_REG (a7,  17, t0)
107	RESTORE_INT_REG (s2,  18, t0)
108	RESTORE_INT_REG (s3,  19, t0)
109	RESTORE_INT_REG (s4,  20, t0)
110	RESTORE_INT_REG (s5,  21, t0)
111	RESTORE_INT_REG (s6,  22, t0)
112	RESTORE_INT_REG (s7,  23, t0)
113	RESTORE_INT_REG (s8,  24, t0)
114	RESTORE_INT_REG (s9,  25, t0)
115	RESTORE_INT_REG (s10, 26, t0)
116	RESTORE_INT_REG (s11, 27, t0)
117
118	jr	t1
119
120
12199:	j	__syscall_error
122
123PSEUDO_END (__swapcontext)
124
125weak_alias (__swapcontext, swapcontext)
126