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7f33b09c PD |
1 | /* Save and set current context. |
2 | Copyright (C) 2009-2018 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 | <http://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) |