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
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
|
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright (c) 2006, 2010, Oracle and/or its affiliates. All rights reserved.
*/
.file "memset.s"
/*
* char *memset(sp, c, n)
*
* Set an array of n chars starting at sp to the character c.
* Return sp.
*
* Fast assembler language version of the following C-program for memset
* which represents the `standard' for the C-library.
*
* void *
* memset(void *sp1, int c, size_t n)
* {
* if (n != 0) {
* char *sp = sp1;
* do {
* *sp++ = (char)c;
* } while (--n != 0);
* }
* return (sp1);
* }
*/
#include <sys/asm_linkage.h>
#include <sys/sun4asi.h>
ANSI_PRAGMA_WEAK(memset,function)
#define ALIGN8(X) (((X) + 7) & ~7)
#define BLOCK_SIZE 64
.section ".text"
.align 32
ENTRY(memset)
cmp %o2, 12 ! if small counts, just write bytes
bgeu,pn %ncc, .wrbig
mov %o0, %o5 ! copy sp1 before using it
.wrchar:
deccc %o2 ! byte clearing loop
inc %o5
bgeu,a,pt %ncc, .wrchar
stb %o1, [%o5 + -1] ! we've already incremented the address
retl
.empty ! next instruction is safe, %o0 still good
.wrbig:
andcc %o5, 7, %o3 ! is sp1 aligned on a 8 byte bound
bz,pt %ncc, .blkchk ! already double aligned
and %o1, 0xff, %o1 ! o1 is (char)c
sub %o3, 8, %o3 ! -(bytes till double aligned)
add %o2, %o3, %o2 ! update o2 with new count
! Set -(%o3) bytes till sp1 double aligned
1: stb %o1, [%o5] ! there is at least 1 byte to set
inccc %o3 ! byte clearing loop
bl,pt %ncc, 1b
inc %o5
! Now sp1 is double aligned (sp1 is found in %o5)
.blkchk:
sll %o1, 8, %o3
or %o1, %o3, %o1 ! now o1 has 2 bytes of c
sll %o1, 16, %o3
or %o1, %o3, %o1 ! now o1 has 4 bytes of c
cmp %o2, 4095 ! if large count use Block ld/st
sllx %o1, 32, %o3
or %o1, %o3, %o1 ! now o1 has 8 bytes of c
bgu,a,pn %ncc, .blkwr ! Do block write for large count
andcc %o5, 63, %o3 ! is sp1 block aligned?
and %o2, 24, %o3 ! o3 is {0, 8, 16, 24}
1: subcc %o3, 8, %o3 ! double-word loop
add %o5, 8, %o5
bgeu,a,pt %ncc, 1b
stx %o1, [%o5 - 8] ! already incremented the address
andncc %o2, 31, %o4 ! o4 has 32 byte aligned count
bz,pn %ncc, 3f ! First instruction of icache line
2:
subcc %o4, 32, %o4 ! main loop, 32 bytes per iteration
stx %o1, [%o5 - 8]
stx %o1, [%o5]
stx %o1, [%o5 + 8]
stx %o1, [%o5 + 16]
bnz,pt %ncc, 2b
add %o5, 32, %o5
3:
and %o2, 7, %o2 ! o2 has the remaining bytes (<8)
4:
deccc %o2 ! byte clearing loop
inc %o5
bgeu,a,pt %ncc, 4b
stb %o1, [%o5 - 9] ! already incremented the address
retl
nop ! %o0 still preserved
.blkwr:
bz,pn %ncc, .blalign ! now block aligned
sub %o3, 64, %o3 ! o3 is -(bytes till block aligned)
add %o2, %o3, %o2 ! o2 is the remainder
! Store -(%o3) bytes till dst is block (64 byte) aligned.
! Use double word stores.
! Recall that dst is already double word aligned
1:
stx %o1, [%o5]
addcc %o3, 8, %o3
bl,pt %ncc, 1b
add %o5, 8, %o5
! sp1 is block aligned
.blalign:
rd %fprs, %g1 ! g1 = fprs
and %o2, 63, %o3 ! calc bytes left after blk store.
andcc %g1, 0x4, %g1 ! fprs.du = fprs.dl = 0
bz,a %ncc, 2f ! Is fprs.fef == 0
wr %g0, 0x4, %fprs ! fprs.fef = 1
2:
brnz,pn %o1, 3f ! %o1 is safe to check all 64-bits
andn %o2, 63, %o4 ! calc size of blocks in bytes
fzero %d0
fzero %d2
fzero %d4
fzero %d6
fmuld %d0, %d0, %d8
fzero %d10
ba 4f
fmuld %d0, %d0, %d12
3:
! allocate 8 bytes of scratch space on the stack
add %sp, -SA(16), %sp
stx %o1, [%sp + STACK_BIAS + ALIGN8(MINFRAME)] ! move %o1 to %d0
ldd [%sp + STACK_BIAS + ALIGN8(MINFRAME)], %d0
fmovd %d0, %d2
add %sp, SA(16), %sp ! deallocate the scratch space
fmovd %d0, %d4
fmovd %d0, %d6
fmovd %d0, %d8
fmovd %d0, %d10
fmovd %d0, %d12
4:
fmovd %d0, %d14
! 1st quadrant has 64 bytes of c
! instructions 32-byte aligned here
#ifdef PANTHER_ONLY
! Panther only code
prefetch [%o5 + (3 * BLOCK_SIZE)], 22
prefetch [%o5 + (6 * BLOCK_SIZE)], 22
std %d0, [%o5]
std %d0, [%o5 + 8]
std %d0, [%o5 + 16]
std %d0, [%o5 + 24]
std %d0, [%o5 + 32]
std %d0, [%o5 + 40]
std %d0, [%o5 + 48]
std %d0, [%o5 + 56]
#else
! Cheetah/Jaguar code
stda %d0, [%o5]ASI_BLK_P
#endif
subcc %o4, 64, %o4
bgu,pt %ncc, 4b
add %o5, 64, %o5
! Set the remaining doubles
subcc %o3, 8, %o3 ! Can we store any doubles?
blu,pn %ncc, 6f
and %o2, 7, %o2 ! calc bytes left after doubles
5:
std %d0, [%o5] ! store the doubles
subcc %o3, 8, %o3
bgeu,pt %ncc, 5b
add %o5, 8, %o5
6:
! Set the remaining bytes
brz %o2, .exit ! safe to check all 64-bits
#if 0
! Terminate the copy with a partial store. (bug 1200071 does not apply)
! The data should be at d0
dec %o2 ! needed to get the mask right
edge8n %g0, %o2, %o4
stda %d0, [%o5]%o4, ASI_PST8_P
#else
7:
deccc %o2
stb %o1, [%o5]
bgu,pt %ncc, 7b
inc %o5
#endif
.exit:
membar #StoreLoad|#StoreStore
retl ! %o0 was preserved
wr %g1, %g0, %fprs ! fprs = g1 restore fprs
SET_SIZE(memset)
|
