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7f33b09c | 1 | /* Set current context. |
d614a753 | 2 | Copyright (C) 2009-2020 Free Software Foundation, Inc. |
7f33b09c PD |
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 | |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
7f33b09c PD |
18 | |
19 | #include "ucontext-macros.h" | |
20 | ||
21 | /* int __setcontext (const ucontext_t *ucp) | |
22 | ||
23 | Restores the machine context in UCP and thereby resumes execution | |
24 | in that context. | |
25 | ||
26 | This implementation is intended to be used for *synchronous* context | |
27 | switches only. Therefore, it does not have to restore anything | |
28 | other than the PRESERVED state. */ | |
29 | ||
30 | .text | |
31 | LEAF (__setcontext) | |
32 | ||
33 | mv t0, a0 /* Save ucp into t0. */ | |
34 | ||
35 | /* rt_sigprocmask (SIG_SETMASK, &ucp->uc_sigmask, NULL, _NSIG8) */ | |
36 | li a3, _NSIG8 | |
37 | mv a2, zero | |
38 | add a1, a0, UCONTEXT_SIGMASK | |
39 | li a0, SIG_SETMASK | |
40 | ||
41 | li a7, SYS_ify (rt_sigprocmask) | |
42 | scall | |
43 | ||
44 | bltz a0, 99f | |
45 | ||
46 | cfi_def_cfa (t0, 0) | |
47 | ||
48 | #ifndef __riscv_float_abi_soft | |
49 | lw t1, MCONTEXT_FSR(t0) | |
50 | ||
51 | RESTORE_FP_REG_CFI (fs0, 8, t0) | |
52 | RESTORE_FP_REG_CFI (fs1, 9, t0) | |
53 | RESTORE_FP_REG_CFI (fs2, 18, t0) | |
54 | RESTORE_FP_REG_CFI (fs3, 19, t0) | |
55 | RESTORE_FP_REG_CFI (fs4, 20, t0) | |
56 | RESTORE_FP_REG_CFI (fs5, 21, t0) | |
57 | RESTORE_FP_REG_CFI (fs6, 22, t0) | |
58 | RESTORE_FP_REG_CFI (fs7, 23, t0) | |
59 | RESTORE_FP_REG_CFI (fs8, 24, t0) | |
60 | RESTORE_FP_REG_CFI (fs9, 25, t0) | |
61 | RESTORE_FP_REG_CFI (fs10, 26, t0) | |
62 | RESTORE_FP_REG_CFI (fs11, 27, t0) | |
63 | ||
64 | fssr t1 | |
65 | #endif /* __riscv_float_abi_soft */ | |
66 | ||
67 | /* Note the contents of argument registers will be random | |
68 | unless makecontext() has been called. */ | |
69 | RESTORE_INT_REG (t1, 0, t0) | |
70 | RESTORE_INT_REG_CFI (ra, 1, t0) | |
71 | RESTORE_INT_REG (sp, 2, t0) | |
72 | RESTORE_INT_REG_CFI (s0, 8, t0) | |
73 | RESTORE_INT_REG_CFI (s1, 9, t0) | |
74 | RESTORE_INT_REG (a0, 10, t0) | |
75 | RESTORE_INT_REG (a1, 11, t0) | |
76 | RESTORE_INT_REG (a2, 12, t0) | |
77 | RESTORE_INT_REG (a3, 13, t0) | |
78 | RESTORE_INT_REG (a4, 14, t0) | |
79 | RESTORE_INT_REG (a5, 15, t0) | |
80 | RESTORE_INT_REG (a6, 16, t0) | |
81 | RESTORE_INT_REG (a7, 17, t0) | |
82 | RESTORE_INT_REG_CFI (s2, 18, t0) | |
83 | RESTORE_INT_REG_CFI (s3, 19, t0) | |
84 | RESTORE_INT_REG_CFI (s4, 20, t0) | |
85 | RESTORE_INT_REG_CFI (s5, 21, t0) | |
86 | RESTORE_INT_REG_CFI (s6, 22, t0) | |
87 | RESTORE_INT_REG_CFI (s7, 23, t0) | |
88 | RESTORE_INT_REG_CFI (s8, 24, t0) | |
89 | RESTORE_INT_REG_CFI (s9, 25, t0) | |
90 | RESTORE_INT_REG_CFI (s10, 26, t0) | |
91 | RESTORE_INT_REG_CFI (s11, 27, t0) | |
92 | ||
93 | jr t1 | |
94 | ||
95 | 99: j __syscall_error | |
96 | ||
367d7cc2 | 97 | END (__setcontext) |
7f33b09c PD |
98 | weak_alias (__setcontext, setcontext) |
99 | ||
100 | LEAF (__start_context) | |
101 | ||
102 | /* Terminate call stack by noting ra == 0. Happily, s0 == 0 here. */ | |
103 | cfi_register (ra, s0) | |
104 | ||
105 | /* Call the function passed to makecontext. */ | |
106 | jalr s1 | |
107 | ||
108 | /* Invoke subsequent context if present, else exit(0). */ | |
109 | mv a0, s2 | |
110 | beqz s2, 1f | |
111 | jal __setcontext | |
112 | 1: j exit | |
113 | ||
367d7cc2 | 114 | END (__start_context) |