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
|
/* Get current user context.
Copyright (C) 2008-2014 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Helge Deller <deller@gmx.de>, 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
<http://www.gnu.org/licenses/>. */
#include <sysdep.h>
#include "ucontext_i.h"
/* Trampoline function. Non-standard calling ABI. */
/* Can not use ENTRY(__getcontext_ret) here. */
.type __getcontext_ret, @function
.hidden __getcontext_ret
__getcontext_ret:
.proc
.callinfo FRAME=0,NO_CALLS
/* r26-r23 contain original r3-r6, but because setcontext
does not reload r3-r6 (it's using them as temporaries)
we must save them elsewhere and swap them back in. */
copy %r23, %r3
copy %r24, %r4
copy %r25, %r5
copy %r26, %r6
/* r20 contains original return pointer. */
bv 0(%r20)
copy %r0, %ret0
.procend
.size __getcontext_ret, .-__getcontext_ret
ENTRY(__getcontext)
/* Save the registers. */
stw %r0, oR0(%r26)
stw %r1, oR1(%r26)
/* stw %r2, oR2(%r26) - used for trampoline. */
stw %r3, oR3(%r26)
stw %r4, oR4(%r26)
stw %r5, oR5(%r26)
stw %r6, oR6(%r26)
stw %r7, oR7(%r26)
stw %r8, oR8(%r26)
stw %r9, oR9(%r26)
stw %r10, oR10(%r26)
stw %r11, oR11(%r26)
stw %r12, oR12(%r26)
stw %r13, oR13(%r26)
stw %r14, oR14(%r26)
stw %r15, oR15(%r26)
stw %r16, oR16(%r26)
stw %r17, oR17(%r26)
stw %r18, oR18(%r26)
stw %r19, oR19(%r26)
/* stw %r20, oR20(%r26) - used for trampoline. */
stw %r21, oR21(%r26)
stw %r22, oR22(%r26)
/* stw %r23, oR23(%r26) - used for trampoline. */
/* stw %r24, oR24(%r26) - used for trampoline. */
/* stw %r25, oR25(%r26) - used for trampoline. */
/* stw %r26, oR26(%r26) - used for trampoline. */
stw %r27, oR27(%r26)
stw %r28, oR28(%r26)
stw %r29, oR29(%r26)
stw %sp, oR30(%r26)
stw %r31, oR31(%r26)
stw %r0, oUC_FLAGS(%r26)
/* stw %r0, oUC_LINK(%r26) - Do not overwrite. */
stw %sp, oSS_SP(%r26)
stw %r0, oSS_FLAGS(%r26)
stw %r0, oSS_SIZE(%r26)
stw %r0, oSC_FLAGS(%r26)
stw %r0, oIASQ0(%r26)
stw %r0, oIASQ1(%r26)
stw %r0, oIAOQ0(%r26)
stw %r0, oIAOQ1(%r26)
stw %r0, oSAR(%r26) /* used as flag in swapcontext(). */
/* Store floating-point regs. */
ldo oFPREGS0(%r26),%r1
fstds,ma %fr0, 8(%r1)
fstds,ma %fr1, 8(%r1)
fstds,ma %fr2, 8(%r1)
fstds,ma %fr3, 8(%r1)
fstds,ma %fr4, 8(%r1)
fstds,ma %fr5, 8(%r1)
fstds,ma %fr6, 8(%r1)
fstds,ma %fr7, 8(%r1)
fstds,ma %fr8, 8(%r1)
fstds,ma %fr9, 8(%r1)
fstds,ma %fr10, 8(%r1)
fstds,ma %fr11, 8(%r1)
fstds,ma %fr12, 8(%r1)
fstds,ma %fr13, 8(%r1)
fstds,ma %fr14, 8(%r1)
fstds,ma %fr15, 8(%r1)
fstds,ma %fr16, 8(%r1)
fstds,ma %fr17, 8(%r1)
fstds,ma %fr18, 8(%r1)
fstds,ma %fr19, 8(%r1)
fstds,ma %fr20, 8(%r1)
fstds,ma %fr21, 8(%r1)
fstds,ma %fr22, 8(%r1)
fstds,ma %fr23, 8(%r1)
fstds,ma %fr24, 8(%r1)
fstds,ma %fr25, 8(%r1)
fstds,ma %fr26, 8(%r1)
fstds,ma %fr27, 8(%r1)
fstds,ma %fr28, 8(%r1)
fstds,ma %fr29, 8(%r1)
fstds,ma %fr30, 8(%r1)
fstds %fr31, 0(%r1)
/* Prologue */
stwm %r4, 64(%sp)
#ifdef PIC
stw %r19, -32(%sp)
#endif
/* Set up the trampoline registers.
r20, r23, r24, r25, r26 and r2 are clobbered
by call to getcontext() anyway. Reuse them. */
stw %r2, oR20(%r26)
stw %r3, oR23(%r26)
stw %r4, oR24(%r26)
stw %r5, oR25(%r26)
stw %r6, oR26(%r26)
ldil L%__getcontext_ret, %r1
ldo R%__getcontext_ret(%r1), %r1
stw %r1, oR2(%r26)
/* Save the current signal mask. */
/* sigprocmask(SIG_BLOCK, NULL, &ucp->uc_sigmask); */
ldo oSIGMASK(%r26), %r24
copy %r0, %r25
bl sigprocmask, %r2
ldi SIG_BLOCK, %r26
/* Epilogue */
ldw -84(%sp), %r2
#ifdef PIC
ldw -96(%sp), %r19
#endif
bv %r0(%r2)
ldwm -64(%sp), %r4
END(__getcontext)
weak_alias (__getcontext, getcontext)
|
