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
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
|
/* Set current context.
Copyright (C) 2009-2025 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 <sysdep.h>
#include "ucontext_i.h"
#include "ucontext-internal.h"
/* int __setcontext (const ucontext_t *ucp)
Restores the machine context in UCP and thereby resumes execution
in that context.
This implementation is intended to be used for *synchronous* context
switches only. Therefore, it does not have to restore anything
other than the PRESERVED state. */
.text
ENTRY (__setcontext)
/* Save a copy of UCP. */
mov x9, x0
/* Set the signal mask with
rt_sigprocmask (SIG_SETMASK, mask, NULL, _NSIG/8). */
mov x0, #SIG_SETMASK
add x1, x9, #UCONTEXT_SIGMASK
mov x2, #0
mov x3, #_NSIG8
mov x8, SYS_ify (rt_sigprocmask)
svc 0
cbz x0, 1f
b C_SYMBOL_NAME (__syscall_error)
1:
/* Disable ZA of SME. */
#if HAVE_AARCH64_PAC_RET
PACIASP
cfi_window_save
#endif
stp x29, x30, [sp, -16]!
cfi_adjust_cfa_offset (16)
cfi_rel_offset (x29, 0)
cfi_rel_offset (x30, 8)
mov x29, sp
bl __libc_arm_za_disable
ldp x29, x30, [sp], 16
cfi_adjust_cfa_offset (-16)
cfi_restore (x29)
cfi_restore (x30)
#if HAVE_AARCH64_PAC_RET
AUTIASP
cfi_window_save
#endif
/* Restore the general purpose registers. */
mov x0, x9
cfi_def_cfa (x0, 0)
cfi_offset (x18, oX0 + 18 * SZREG)
cfi_offset (x19, oX0 + 19 * SZREG)
cfi_offset (x20, oX0 + 20 * SZREG)
cfi_offset (x21, oX0 + 21 * SZREG)
cfi_offset (x22, oX0 + 22 * SZREG)
cfi_offset (x23, oX0 + 23 * SZREG)
cfi_offset (x24, oX0 + 24 * SZREG)
cfi_offset (x25, oX0 + 25 * SZREG)
cfi_offset (x26, oX0 + 26 * SZREG)
cfi_offset (x27, oX0 + 27 * SZREG)
cfi_offset (x28, oX0 + 28 * SZREG)
cfi_offset (x29, oX0 + 29 * SZREG)
cfi_offset (x30, oX0 + 30 * SZREG)
cfi_offset ( d8, oV0 + 8 * SZVREG)
cfi_offset ( d9, oV0 + 9 * SZVREG)
cfi_offset (d10, oV0 + 10 * SZVREG)
cfi_offset (d11, oV0 + 11 * SZVREG)
cfi_offset (d12, oV0 + 12 * SZVREG)
cfi_offset (d13, oV0 + 13 * SZVREG)
cfi_offset (d14, oV0 + 14 * SZVREG)
cfi_offset (d15, oV0 + 15 * SZVREG)
ldp x18, x19, [x0, oX0 + 18 * SZREG]
ldp x20, x21, [x0, oX0 + 20 * SZREG]
ldp x22, x23, [x0, oX0 + 22 * SZREG]
ldp x24, x25, [x0, oX0 + 24 * SZREG]
ldp x26, x27, [x0, oX0 + 26 * SZREG]
ldp x28, x29, [x0, oX0 + 28 * SZREG]
ldr x30, [x0, oX0 + 30 * SZREG]
ldr x2, [x0, oSP]
mov sp, x2
/* Check for FP SIMD context. We don't support restoring
contexts created by the kernel, so this context must have
been created by getcontext. Hence we can rely on the
first extension
|
