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
|
/* Save current context and install the given one.
Copyright (C) 2012-2019 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"
ENTRY(__swapcontext)
/* Load address of the context data structure we save in. */
move.l 4(%sp), %a0
/* Save the preserved registers and the return address. */
movem.l %d2-%d7, oGREGS+2*4(%a0)
movem.l %a2-%a6, oGREGS+10*4(%a0)
lea 4(%sp), %a1
move.l %a1, oSP(%a0)
move.l (%sp), oPC(%a0)
fmovem.l %fpsr/%fpcr/%fpiar, oFPREGS(%a0)
fmovem.x %fp2-%fp7, oFP2(%a0)
cfi_def_cfa (%a0, 0)
cfi_offset (%d2, oGREGS+2*4)
cfi_offset (%d3, oGREGS+3*4)
cfi_offset (%a2, oGREGS+10*4)
cfi_offset (%pc, oPC)
/* Load address of the context data structure we have to load. */
move.l 8(%sp), %a1
/* Save the current signal mask and install the new one. */
lea oSIGMASK(%a0), %a2
move.l %a2, %d3
lea oSIGMASK(%a1), %a2
move.l %a2, %d2
move.l #SIG_SETMASK, %d1
move.l #__NR_sigprocmask, %d0
trap #0
cmp.l #-4095, %d0 /* Check %d0 for error. */
jcs 0f
/* Restore registers. */
move.l oGREGS+2*4(%a0), %d2
cfi_restore (%d2)
move.l oGREGS+3*4(%a0), %d3
cfi_restore (%d3)
move.l oGREGS+10*4(%a0), %a2
cfi_restore (%a2)
jra SYSCALL_ERROR_LABEL /* Jump to error handler. */
0: /* Load the new stack pointer. */
move.l oSP(%a1), %sp
cfi_def_cfa (%a1, 0)
cfi_offset (%d2, oGREGS+2*4)
cfi_offset (%d3, oGREGS+3*4)
cfi_offset (%d4, oGREGS+4*4)
cfi_offset (%d5, oGREGS+5*4)
cfi_offset (%d6, oGREGS+6*4)
cfi_offset (%d7, oGREGS+7*4)
cfi_offset (%a2, oGREGS+10*4)
cfi_offset (%a3, oGREGS+11*4)
cfi_offset (%a4, oGREGS+12*4)
cfi_offset (%a5, oGREGS+13*4)
cfi_offset (%a6, oGREGS+14*4)
cfi_offset (%fp2, oFP2+0*12)
cfi_offset (%fp3, oFP2+1*12)
cfi_offset (%fp4, oFP2+2*12)
cfi_offset (%fp5, oFP2+3*12)
cfi_offset (%fp6, oFP2+4*12)
cfi_offset (%fp7, oFP2+5*12)
cfi_offset (%pc, oPC)
/* Load the values of all the preserved registers (except SP). */
movem.l oGREGS+2*4(%a1), %d2-%d7
movem.l oGREGS+10*4(%a1), %a2-%a6
fmovem.l oFPREGS(%a1), %fpsr/%fpcr/%fpiar
fmovem.x oFP2(%a1), %fp2-%fp7
/* Clear D0 to indicate success. */
clr.l %d0
/* Fetch the address to return to. */
move.l oPC(%a1), %a0
/* End FDE here, we fall into another context. */
cfi_endproc
cfi_startproc
cfi_register (%pc, %a0)
jmp (%a0)
cfi_offset (%pc, -4)
PSEUDO_END(__swapcontext)
weak_alias (__swapcontext, swapcontext)
|
