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
|
/* Save current context and install the given one.
Copyright (C) 2008-2020 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by David S. Miller <davem@davemloft.net>, 2008.
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 <sys/trap.h>
#include "ucontext_i.h"
/* int __swapcontext (ucontext_t *oucp, const ucontext_t *ucp);
Saves the machine context in oucp such that when it is activated,
it appears as if __swapcontext() returned again, 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 save anything
other than the PRESERVED state. */
ENTRY(__swapcontext)
save %sp, -112, %sp
ta ST_FLUSH_WINDOWS
st %g0, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_PSR]
add %i7, 8, %o0
st %o0, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_PC]
add %o0, 4, %o0
st %o0, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_NPC]
rd %y, %o1
st %o1, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_Y]
st %g1, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_G1]
st %g2, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_G2]
st %g3, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_G3]
st %g4, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_G4]
st %g5, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_G5]
st %g6, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_G6]
st %g7, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_G7]
st %g0, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_O0]
st %i1, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_O1]
st %i2, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_O2]
st %i3, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_O3]
st %i4, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_O4]
st %i5, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_O5]
st %i6, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_O6]
st %i7, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_O7]
st %g0, [%i0 + UC_MCONTEXT + MC_GWINS]
stb %g0, [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_EN]
st %g0, [%i0 + UC_MCONTEXT + MC_XRS + XRS_ID]
st %g0, [%i0 + UC_MCONTEXT + MC_XRS + XRS_PTR]
mov SIG_SETMASK, %o0
add %i1, UC_SIGMASK, %o1
add %i0, UC_SIGMASK, %o2
mov 8, %o3
mov __NR_rt_sigprocmask, %g1
ta 0x10
mov %i1, %i0
ldub [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_EN], %g1
cmp %g1, 0
be 1f
nop
ld [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_FSR], %fsr
ldd [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_D0], %f0
ldd [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_D2], %f2
ldd [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_D4], %f4
ldd [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_D6], %f6
ldd [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_D8], %f8
ldd [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_D10], %f10
ldd [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_D12], %f12
ldd [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_D14], %f14
ldd [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_D16], %f16
ldd [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_D18], %f18
ldd [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_D20], %f20
ldd [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_D22], %f22
ldd [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_D24], %f24
ldd [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_D26], %f26
ldd [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_D28], %f28
ldd [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_D30], %f30
1:
ld [%i0 + UC_MCONTEXT + MC_GREGS + GREG_Y], %g1
wr %g1, 0x0, %y
ld [%i0 + UC_MCONTEXT + MC_GREGS + GREG_G2], %g2
ld [%i0 + UC_MCONTEXT + MC_GREGS + GREG_G3], %g3
ld [%i0 + UC_MCONTEXT + MC_GREGS + GREG_G4], %g4
ld [%i0 + UC_MCONTEXT + MC_GREGS + GREG_G5], %g5
ld [%i0 + UC_MCONTEXT + MC_GREGS + GREG_G6], %g6
ld [%i0 + UC_MCONTEXT + MC_GREGS + GREG_G7], %g7
ld [%i0 + UC_MCONTEXT + MC_GREGS + GREG_O1], %i1
ld [%i0 + UC_MCONTEXT + MC_GREGS + GREG_O2], %i2
ld [%i0 + UC_MCONTEXT + MC_GREGS + GREG_O3], %i3
ld [%i0 + UC_MCONTEXT + MC_GREGS + GREG_O4], %i4
ld [%i0 + UC_MCONTEXT + MC_GREGS + GREG_O5], %i5
ld [%i0 + UC_MCONTEXT + MC_GREGS + GREG_O6], %i6
restore
ld [%o0 + UC_MCONTEXT + MC_GREGS + GREG_O7], %o7
ld [%o0 + UC_MCONTEXT + MC_GREGS + GREG_PC], %g1
jmpl %g1, %g0
ld [%o0 + UC_MCONTEXT + MC_GREGS + GREG_O0], %o0
END(__swapcontext)
weak_alias (__swapcontext, swapcontext)
|
GitWeb