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
|
/* memcpy - copy a block from source to destination. 31/64 bit S/390 version.
Copyright (C) 2012-2018 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
<http://www.gnu.org/licenses/>. */
#include <sysdep.h>
#include "asm-syntax.h"
/* INPUT PARAMETERS
%r2 = address of destination memory area
%r3 = address of source memory area
%r4 = number of bytes to copy. */
.text
#if defined __s390x__
# define LTGR ltgr
# define CGHI cghi
# define LGR lgr
# define AGHI aghi
# define BRCTG brctg
#else
# define LTGR ltr
# define CGHI chi
# define LGR lr
# define AGHI ahi
# define BRCTG brct
#endif /* ! defined __s390x__ */
ENTRY(__mempcpy)
#if defined __s390x__
.machine "z900"
#else
.machine "g5"
#endif /* ! defined __s390x__ */
LGR %r1,%r2 # Use as dest
la %r2,0(%r4,%r2) # Return dest + n
j .L_Z900_G5_start
END(__mempcpy)
#ifndef USE_MULTIARCH
libc_hidden_def (__mempcpy)
weak_alias (__mempcpy, mempcpy)
libc_hidden_builtin_def (mempcpy)
#endif
ENTRY(memcpy)
#if defined __s390x__
.machine "z900"
#else
.machine "g5"
#endif /* ! defined __s390x__ */
LGR %r1,%r2 # r1: Use as dest ; r2: Return dest
.L_Z900_G5_start:
LTGR %r4,%r4
je .L_Z900_G5_4
AGHI %r4,-1
#if defined __s390x__
srlg %r5,%r4,8
#else
lr %r5,%r4
srl %r5,8
#endif /* ! defined __s390x__ */
LTGR %r5,%r5
jne .L_Z900_G5_13
.L_Z900_G5_3:
#if defined __s390x__
larl %r5,.L_Z900_G5_15
# define Z900_G5_EX_D 0
#else
basr %r5,0
.L_Z900_G5_14:
# define Z900_G5_EX_D .L_Z900_G5_15-.L_Z900_G5_14
#endif /* ! defined __s390x__ */
ex %r4,Z900_G5_EX_D(%r5)
.L_Z900_G5_4:
br %r14
.L_Z900_G5_13:
CGHI %r5,4096 # Switch to mvcle for copies >1MB
jh __memcpy_mvcle
.L_Z900_G5_12:
mvc 0(256,%r1),0(%r3)
la %r1,256(%r1)
la %r3,256(%r3)
BRCTG %r5,.L_Z900_G5_12
j .L_Z900_G5_3
.L_Z900_G5_15:
mvc 0(1,%r1),0(%r3)
END(memcpy)
#ifndef USE_MULTIARCH
libc_hidden_builtin_def (memcpy)
#endif
ENTRY(__memcpy_mvcle)
# Using as standalone function will result in unexpected
# results since the length field is incremented by 1 in order to
# compensate the changes already done in the functions above.
LGR %r0,%r2 # backup return dest [ + n ]
AGHI %r4,1 # length + 1
LGR %r5,%r4 # source length
LGR %r4,%r3 # source address
LGR %r2,%r1 # destination address
LGR %r3,%r5 # destination length = source length
.L_MVCLE_1:
mvcle %r2,%r4,0 # thats it, MVCLE is your friend
jo .L_MVCLE_1
LGR %r2,%r0 # return destination address
br %r14
END(__memcpy_mvcle)
#undef LTGR
#undef CGHI
#undef LGR
#undef AGHI
#undef BRCTG
|
