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 | |
23 | LEAF (__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 | |
121 | 99: j __syscall_error |
122 | |
123 | PSEUDO_END (__swapcontext) |
124 | |
125 | weak_alias (__swapcontext, swapcontext) |
126 | |