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
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
|
/* Set a block of memory to some byte value. 31/64 bit S/390 version.
Copyright (C) 2001-2021 Free Software Foundation, Inc.
Contributed by Martin Schwidefsky (schwidefsky@de.ibm.com).
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 "asm-syntax.h"
#include <ifunc-memset.h>
/* INPUT PARAMETERS - MEMSET
%r2 = address of memory area
%r3 = byte to fill memory with
%r4 = number of bytes to fill.
INPUT PARAMETERS - BZERO
%r2 = address of memory area
%r3 = number of bytes to fill. */
.text
#if HAVE_MEMSET_Z900_G5
# 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(BZERO_Z900_G5)
LGR %r4,%r3
xr %r3,%r3
j .L_Z900_G5_start
END(BZERO_Z900_G5)
ENTRY(MEMSET_Z900_G5)
.L_Z900_G5_start:
#if defined __s390x__
.machine "z900"
#else
.machine "g5"
#endif /* ! defined __s390x__ */
LTGR %r4,%r4
je .L_Z900_G5_4
stc %r3,0(%r2)
CGHI %r4,1
LGR %r1,%r2
je .L_Z900_G5_4
AGHI %r4,-2
#if defined __s390x__
larl %r5,.L_Z900_G5_18
srlg %r3,%r4,8
# define Z900_G5_EX_D 0
#else
basr %r5,0
.L_Z900_G5_19:
# define Z900_G5_EX_D .L_Z900_G5_18-.L_Z900_G5_19
lr %r3,%r4
srl %r3,8
#endif /* ! defined __s390x__ */
LTGR %r3,%r3
jne .L_Z900_G5_14
.L_Z900_G5_3:
ex %r4,Z900_G5_EX_D(%r5)
.L_Z900_G5_4:
br %r14
.L_Z900_G5_14:
mvc 1(256,%r1),0(%r1)
la %r1,256(%r1)
BRCTG %r3,.L_Z900_G5_14
j .L_Z900_G5_3
.L_Z900_G5_18:
mvc 1(1,%r1),0(%r1)
END(MEMSET_Z900_G5)
# undef LTGR
# undef CGHI
# undef LGR
# undef AGHI
# undef BRCTG
#endif /* HAVE_MEMSET_Z900_G5 */
#if HAVE_MEMSET_Z10
ENTRY(BZERO_Z10)
.machine "z10"
.machinemode "zarch_nohighgprs"
lgr %r4,%r3
xr %r3,%r3
j .L_Z10_start
END(BZERO_Z10)
ENTRY(MEMSET_Z10)
.L_Z10_start:
.machine "z10"
.machinemode "zarch_nohighgprs"
# if !defined __s390x__
llgfr %r4,%r4
# endif /* !defined __s390x__ */
cgije %r4,0,.L_Z10_4
stc %r3,0(%r2)
lgr %r1,%r2
cgije %r4,1,.L_Z10_4
aghi %r4,-2
srlg %r5,%r4,8
cgijlh %r5,0,.L_Z10_15
.L_Z10_3:
exrl %r4,.L_Z10_18
.L_Z10_4:
br %r14
.L_Z10_15:
cgfi %r5,163840 # Switch to mvcle for >40MB
jh __memset_mvcle
.L_Z10_14:
pfd 2,1024(%r1)
mvc 1(256,%r1),0(%r1)
la %r1,256(%r1)
brctg %r5,.L_Z10_14
j .L_Z10_3
.L_Z10_18:
mvc 1(1,%r1),0(%r1)
END(MEMSET_Z10)
#endif /* HAVE_MEMSET_Z10 */
#if HAVE_MEMSET_Z196
ENTRY(BZERO_Z196)
.machine "z196"
.machinemode "zarch_nohighgprs"
lgr %r4,%r3
xr %r3,%r3
j .L_Z196_start
END(BZERO_Z196)
ENTRY(MEMSET_Z196)
.L_Z196_start:
.machine "z196"
.machinemode "zarch_nohighgprs"
# if !defined __s390x__
llgfr %r4,%r4
# endif /* !defined __s390x__ */
clgfi %r4,1
jl .L_Z196_4 # n == 0
stc %r3,0(%r2)
je .L_Z196_4 # n == 1
aghi %r4,-2
lgr %r1,%r2
risbg %r5,%r4,8,128+63,56 # r5 = n / 256
jne .L_Z196_1 # Jump away if r5 != 0
.L_Z196_3:
exrl %r4,.L_Z196_17
.L_Z196_4:
br %r14
.L_Z196_1:
cgfi %r5,1048576
jh __memset_mvcle # Switch to mvcle for >256MB
.L_Z196_2:
pfd 2,1024(%r1)
mvc 1(255,%r1),0(%r1)
aghi %r5,-1
la %r1,256(%r1)
stc %r3,0(%r1)
jne .L_Z196_2
j .L_Z196_3
.L_Z196_17:
mvc 1(1,%r1),0(%r1)
END(MEMSET_Z196)
#endif /* HAVE_MEMSET_Z196 */
#if HAVE_MEMSET_MVCLE
ENTRY(__memset_mvcle)
aghi %r4,2 # take back the change done by the caller
lgr %r0,%r2 # save source address
lgr %r1,%r3 # move pad byte to R1
lgr %r3,%r4 # move length to r3
sgr %r4,%r4 # no source for MVCLE, only a pad byte
sgr %r5,%r5
.L0: mvcle %r2,%r4,0(%r1) # thats it, MVCLE is your friend
jo .L0
lgr %r2,%r0 # return value is source address
.L1:
br %r14
END(__memset_mvcle)
#endif /* HAVE_MEMSET_MVCLE */
#if ! HAVE_MEMSET_IFUNC
/* If we don't use ifunc, define an alias for memset here.
Otherwise see sysdeps/s390/memset.c. */
strong_alias (MEMSET_DEFAULT, memset)
/* Same for bzero. If ifunc is used, see
sysdeps/s390/bzero.c. */
strong_alias (BZERO_DEFAULT, __bzero)
weak_alias (__bzero, bzero)
#endif
#if defined SHARED && IS_IN (libc)
/* Defines the internal symbol.
Compare to libc_hidden_builtin_def (memset) in string/memset.c. */
strong_alias (MEMSET_DEFAULT, __GI_memset)
#endif
|
