1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
|
/* Save and set current context.
Copyright (C) 2022-2023 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library. If not, see
<https://www.gnu.org/licenses/>. */
#include "ucontext-macros.h"
/* int swapcontext (ucontext_t *oucp, const ucontext_t *ucp) */
LEAF (__swapcontext)
ori a2, sp, 0 /* Save sp to a2 */
addi.d sp, sp, -16
st.d a1, sp, 0
ori t0, a1, 0
SAVE_INT_REG (ra, 1, a0)
SAVE_INT_REG (a2, 3, a0) /* Store sp */
SAVE_INT_REG (zero, 4, a0) /* return 0 by overwriting a0 */
SAVE_INT_REG (x, 21, a0)
SAVE_INT_REG (fp, 22, a0)
SAVE_INT_REG (s0, 23, a0)
SAVE_INT_REG (s1, 24, a0)
SAVE_INT_REG (s2, 25, a0)
SAVE_INT_REG (s3, 26, a0)
SAVE_INT_REG (s4, 27, a0)
SAVE_INT_REG (s5, 28, a0)
SAVE_INT_REG (s6, 29, a0)
SAVE_INT_REG (s7, 30, a0)
SAVE_INT_REG (s8, 31, a0)
st.d ra, a0, MCONTEXT_PC
/* rt_sigprocmask (SIG_SETMASK, &ucp->uc_sigmask, &oucp->uc_sigmask, _NSIG8) */
li.d a3, _NSIG8
li.d a2, UCONTEXT_SIGMASK
add.d a2, a2, a0
li.d a1, UCONTEXT_SIGMASK
add.d a1, a1, t0
li.d a0, SIG_SETMASK
li.d a7, SYS_ify (rt_sigprocmask)
syscall 0
blt a0, zero, 99f
ld.d t0, sp, 0 /* Load a1 to t0 */
/* Note the contents of argument registers will be random
unless makecontext() has been called. */
RESTORE_INT_REG (ra, 1, t0)
RESTORE_INT_REG (sp, 3, t0)
RESTORE_INT_REG (a0, 4, t0)
RESTORE_INT_REG (a1, 5, t0)
RESTORE_INT_REG (a2, 6, t0)
RESTORE_INT_REG (a3, 7, t0)
RESTORE_INT_REG (a4, 8, t0)
RESTORE_INT_REG (a5, 9, t0)
RESTORE_INT_REG (a6, 10, t0)
RESTORE_INT_REG (a7, 11, t0)
RESTORE_INT_REG (x, 21, t0)
RESTORE_INT_REG (fp, 22, t0)
RESTORE_INT_REG (s0, 23, t0)
RESTORE_INT_REG (s1, 24, t0)
RESTORE_INT_REG (s2, 25, t0)
RESTORE_INT_REG (s3, 26, t0)
RESTORE_INT_REG (s4, 27, t0)
RESTORE_INT_REG (s5, 28, t0)
RESTORE_INT_REG (s6, 29, t0)
RESTORE_INT_REG (s7, 30, t0)
RESTORE_INT_REG (s8, 31, t0)
ld.d t1, t0, MCONTEXT_PC
jirl $r0, t1, 0
99:
addi.d sp, sp, 16
b __syscall_error
PSEUDO_END (__swapcontext)
weak_alias (__swapcontext, swapcontext)
|
