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
|
/* Copyright (C) 2004-2022 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-offsets.h>
ENTRY(__makecontext)
ldgp $29, 0($27)
#ifdef PROF
.set noat
lda AT, _mcount
jsr AT, (AT), _mcount
.set at
#endif
.prologue 1
/* Compute top of stack, including arguments. */
ldq $1, UC_STACK+SS_SP($16)
ldq $2, UC_STACK+SS_SIZE($16)
addq $1, $2, $8
subq $18, 6, $1
cmovlt $1, 0, $1
s8addq $1, 0, $2
subq $8, $2, $8
/* Copy all parameters. Switch statement header here. */
ldah $3, $jumptable($29) !gprelhigh
cmple $18, 6, $1
mov $18, $2
cmoveq $1, 7, $2
s4addq $2, $3, $3
ldl $4, $jumptable($3) !gprellow
addq $4, $29, $4
jmp $31, ($4), $args1
.section .rodata
.align 2
$jumptable:
.gprel32 $args0
.gprel32 $args1
.gprel32 $args2
.gprel32 $args3
.gprel32 $args4
.gprel32 $args5
.gprel32 $args6
.gprel32 $argsN
.text
/* Here we process arguments 7 through N. This is a straight
stack-to-stack copy. */
.align 4
$argsN:
subq $18, 6, $1
lda $2, 0($8)
lda $3, 3*8($30)
.align 4
1:
ldq $0, 0($3)
subq $1, 1, $1
lda $3, 8($3)
stq $0, 0($2)
lda $2, 8($2)
bne $1, 1b
/* Here we process arguments 6 through 0. This involves
copying into the register save areas of the ucontext. */
.align 4
$args6:
ldq $0, 2*8($30)
stq $0, UC_SIGCTX+SC_REGS+21*8($16)
unop
stq $0, UC_SIGCTX+SC_FPREGS+21*8($16)
$args5:
ldq $0, 1*8($30)
stq $0, UC_SIGCTX+SC_REGS+20*8($16)
unop
stq $0, UC_SIGCTX+SC_FPREGS+20*8($16)
$args4:
ldq $0, 0*8($30)
stq $0, UC_SIGCTX+SC_REGS+19*8($16)
unop
stq $0, UC_SIGCTX+SC_FPREGS+19*8($16)
$args3:
unop
stq $21, UC_SIGCTX+SC_REGS+18*8($16)
unop
stt $f21, UC_SIGCTX+SC_FPREGS+18*8($16)
$args2:
unop
stq $20, UC_SIGCTX+SC_REGS+17*8($16)
unop
stt $f20, UC_SIGCTX+SC_FPREGS+17*8($16)
$args1:
unop
stq $19, UC_SIGCTX+SC_REGS+16*8($16)
unop
stt $f19, UC_SIGCTX+SC_FPREGS+16*8($16)
$args0:
/* Set up the registers ready to invoke __startcontext.
We seed $27 with the target function address, and $9
with the link from ucp. */
ldah $0, __startcontext($29) !gprelhigh
ldq $1, UC_LINK($16)
lda $0, __startcontext($0) !gprellow
stq $17, UC_SIGCTX+SC_REGS+27*8($16)
stq $8, UC_SIGCTX+SC_REGS+30*8($16)
stq $0, UC_SIGCTX+SC_PC($16)
stq $1, UC_SIGCTX+SC_REGS+9*8($16)
/* No return value from makecontext. */
ret
END(__makecontext)
weak_alias (__makecontext, makecontext)
/* This function is where a new makecontext "thread" begins life.
We have already set up $27 for calling the target function, and
we've set $9 to the UC_LINK of the parent context.
If the function returns, we either jump to the linked context
(if non-null) or exit. */
.align 4
.ent __startcontext
__startcontext:
.frame $31, 0, $31, 0
.prologue 0
jsr $26, ($27), 0
ldgp $29, 0($26)
mov $9, $16
beq $9, 1f
#ifdef PIC
bsr $26, __setcontext !samegp
1: mov $31, $16
bsr $26, HIDDEN_JUMPTARGET(exit) !samegp
#else
jsr $26, __setcontext
ldgp $29, 0($26)
1: mov $31, $16
jsr $26, HIDDEN_JUMPTARGET(exit)
#endif
halt
.end __startcontext
|
