1/* Set a block of memory to some byte value.
2 For SPARC v7.
3 Copyright (C) 1996-2024 Free Software Foundation, Inc.
4 This file is part of the GNU C Library.
5
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public
8 License as published by the Free Software Foundation; either
9 version 2.1 of the License, or (at your option) any later version.
10
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
15
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, see
18 <https://www.gnu.org/licenses/>. */
19
20#include <sysdep.h>
21
22 /* Store 64 bytes at (BASE + OFFSET) using value SOURCE. */
23#define ZERO_BIG_BLOCK(base, offset, source) \
24 std source, [base + offset + 0x00]; \
25 std source, [base + offset + 0x08]; \
26 std source, [base + offset + 0x10]; \
27 std source, [base + offset + 0x18]; \
28 std source, [base + offset + 0x20]; \
29 std source, [base + offset + 0x28]; \
30 std source, [base + offset + 0x30]; \
31 std source, [base + offset + 0x38];
32
33#define ZERO_LAST_BLOCKS(base, offset, source) \
34 std source, [base - offset - 0x38]; \
35 std source, [base - offset - 0x30]; \
36 std source, [base - offset - 0x28]; \
37 std source, [base - offset - 0x20]; \
38 std source, [base - offset - 0x18]; \
39 std source, [base - offset - 0x10]; \
40 std source, [base - offset - 0x08]; \
41 std source, [base - offset - 0x00];
42
43 .text
44 .align 4
45ENTRY(memset)
46 and %o1, 0xff, %g3
47 sll %g3, 8, %g2
48 or %g3, %g2, %g3
49 sll %g3, 16, %g2
50 or %g3, %g2, %g3
51 orcc %o2, %g0, %o1
521: cmp %o1, 7
53 bleu 7f
54 mov %o0, %g1
55
56 andcc %o0, 3, %o2
57 bne 3f
585: andcc %o0, 4, %g0
59
60 be 2f
61 mov %g3, %g2
62
63 st %g3, [%o0]
64 sub %o1, 4, %o1
65 add %o0, 4, %o0
662: andcc %o1, 0xffffff80, %o3
67 be 9f
68 andcc %o1, 0x78, %o2
694: ZERO_BIG_BLOCK (%o0, 0x00, %g2)
70 subcc %o3, 128, %o3
71 ZERO_BIG_BLOCK (%o0, 0x40, %g2)
72 bne 4b
73 add %o0, 128, %o0
74
75 orcc %o2, %g0, %g0
769: be 6f
77 andcc %o1, 7, %o1
78
79 mov %o7, %g4
80101: call 100f
81 srl %o2, 1, %o3
82 mov %g4, %o7
83 jmpl %o4 + (20f + 64 - 101b), %g0
84 add %o0, %o2, %o0
85
86100: retl
87 sub %o7, %o3, %o4
88
8920: ZERO_LAST_BLOCKS(%o0, 0x48, %g2)
90 ZERO_LAST_BLOCKS(%o0, 0x08, %g2)
91
926: be 8f
93 andcc %o1, 4, %g0
94 be 1f
95 andcc %o1, 2, %g0
96 st %g3, [%o0]
97 add %o0, 4, %o0
981: be 1f
99 andcc %o1, 1, %g0
100 sth %g3, [%o0]
101 add %o0, 2, %o0
1021: bne,a 8f
103 stb %g3, [%o0]
1048: retl
105 mov %g1, %o0
1067: orcc %o1, 0, %g0
107 be 0f
108 subcc %o1, 1, %o1
109 stb %g3, [%o0]
110 be 0f
111 subcc %o1, 1, %o1
112 stb %g3, [%o0 + 1]
113 be 0f
114 subcc %o1, 1, %o1
115 stb %g3, [%o0 + 2]
116 be 0f
117 subcc %o1, 1, %o1
118 stb %g3, [%o0 + 3]
119 be 0f
120 subcc %o1, 1, %o1
121 stb %g3, [%o0 + 4]
122 be 0f
123 subcc %o1, 1, %o1
124 stb %g3, [%o0 + 5]
125 be 0f
126 subcc %o1, 1, %o1
127 stb %g3, [%o0 + 6]
1280: retl
129 nop
130
1313: cmp %o2, 3
132 be 2f
133 stb %g3, [%o0]
134
135 cmp %o2, 2
136 be 2f
137 stb %g3, [%o0 + 0x01]
138
139 stb %g3, [%o0 + 0x02]
1402: sub %o2, 4, %o2
141 add %o1, %o2, %o1
142 b 5b
143 sub %o0, %o2, %o0
144END(memset)
145libc_hidden_builtin_def (memset)
146

source code of glibc/sysdeps/sparc/sparc32/memset.S