1 /*
2 * Copyright 2004 Sun Microsystems, Inc. All rights reserved.
3 * Use is subject to license terms.
4 */
5
6 #pragma ident "%Z%%M% %I% %E% SMI"
7
8 /*-
9 * Copyright (c) 1993 The Regents of the University of California.
10 * All rights reserved.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 * 3. All advertising materials mentioning features or use of this software
21 * must display the following acknowledgement:
22 * This product includes software developed by the University of
23 * California, Berkeley and its contributors.
24 * 4. Neither the name of the University nor the names of its contributors
25 * may be used to endorse or promote products derived from this software
26 * without specific prior written permission.
27 *
28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
31 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38 * SUCH DAMAGE.
39 *
40 * $FreeBSD: src/sys/amd64/amd64/support.S,v 1.102 2003/10/02 05:08:13 alc Exp $
41 */
42
43 #include <sys/asm_linkage.h>
44
45 #if defined(__lint)
46
47 /*
48 * Overlapping bcopy (source and target may overlap arbitrarily).
49 */
50 /* ARGSUSED */
51 void
52 ovbcopy(const void *from, void *to, size_t count)
53 {}
54
55 #else /* __lint */
56
57 /*
58 * Adapted from fbsd bcopy().
59 *
60 * bcopy(src, dst, cnt)
61 * rdi, rsi, rdx
62 * ws@tools.de (Wolfgang Solfrank, TooLs GmbH) +49-228-985800
63 */
64
65 #if defined(__amd64)
66
67 ENTRY(ovbcopy)
68 xchgq %rsi,%rdi
69 movq %rdx,%rcx
70
71 movq %rdi,%rax
72 subq %rsi,%rax
73 cmpq %rcx,%rax /* overlapping && src < dst? */
74 jb reverse
75
76 shrq $3,%rcx /* copy by 64-bit words */
77 cld /* nope, copy forwards */
78 rep
79 movsq
80 movq %rdx,%rcx
81 andq $7,%rcx /* any bytes left? */
82 rep
83 movsb
84 ret
85
86 reverse:
87 addq %rcx,%rdi /* copy backwards */
88 addq %rcx,%rsi
89 decq %rdi
90 decq %rsi
91 andq $7,%rcx /* any fractional bytes? */
92 std
93 rep
94 movsb
95 movq %rdx,%rcx /* copy remainder by 32-bit words */
96 shrq $3,%rcx
97 subq $7,%rsi
98 subq $7,%rdi
99 rep
100 movsq
101 cld
102 ret
103 SET_SIZE(ovbcopy)
104
105 #elif defined(__i386)
106
107 ENTRY(ovbcopy)
108 pushl %esi
109 pushl %edi
110 movl 12(%esp),%esi
111 movl 16(%esp),%edi
112 movl 20(%esp),%ecx
113
114 movl %edi,%eax
115 subl %esi,%eax
116 cmpl %ecx,%eax /* overlapping && src < dst? */
117 jb reverse
118
119 shrl $2,%ecx /* copy by 32-bit words */
120 cld /* nope, copy forwards */
121 rep
122 movsl
123 movl 20(%esp),%ecx
124 andl $3,%ecx /* any bytes left? */
125 rep
126 movsb
127 popl %edi
128 popl %esi
129 ret
130
131 reverse:
132 addl %ecx,%edi /* copy backwards */
133 addl %ecx,%esi
134 decl %edi
135 decl %esi
136 andl $3,%ecx /* any fractional bytes? */
137 std
138 rep
139 movsb
140 movl 20(%esp),%ecx /* copy remainder by 32-bit words */
141 shrl $2,%ecx
142 subl $3,%esi
143 subl $3,%edi
144 rep
145 movsl
146 popl %edi
147 popl %esi
148 cld
149 ret
150 SET_SIZE(ovbcopy)
151
152 #endif /* __i386 */
153
154 #endif /* __lint */
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1 /*
2 * Copyright 2004 Sun Microsystems, Inc. All rights reserved.
3 * Use is subject to license terms.
4 */
5
6 /*
7 * Copyright 2019 Joyent, Inc.
8 */
9
10 /*-
11 * Copyright (c) 1993 The Regents of the University of California.
12 * All rights reserved.
13 *
14 * Redistribution and use in source and binary forms, with or without
15 * modification, are permitted provided that the following conditions
16 * are met:
17 * 1. Redistributions of source code must retain the above copyright
18 * notice, this list of conditions and the following disclaimer.
19 * 2. Redistributions in binary form must reproduce the above copyright
20 * notice, this list of conditions and the following disclaimer in the
21 * documentation and/or other materials provided with the distribution.
22 * 3. All advertising materials mentioning features or use of this software
23 * must display the following acknowledgement:
24 * This product includes software developed by the University of
25 * California, Berkeley and its contributors.
26 * 4. Neither the name of the University nor the names of its contributors
27 * may be used to endorse or promote products derived from this software
28 * without specific prior written permission.
29 *
30 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
31 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
32 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
33 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
34 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
35 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
36 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
37 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
38 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
39 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
40 * SUCH DAMAGE.
41 *
42 * $FreeBSD: src/sys/amd64/amd64/support.S,v 1.102 2003/10/02 05:08:13 alc Exp $
43 */
44
45 #include <sys/asm_linkage.h>
46
47 /*
48 * Adapted from fbsd bcopy().
49 *
50 * bcopy(src, dst, cnt)
51 * rdi, rsi, rdx
52 * ws@tools.de (Wolfgang Solfrank, TooLs GmbH) +49-228-985800
53 */
54
55 ENTRY(ovbcopy)
56 xchgq %rsi,%rdi
57 movq %rdx,%rcx
58
59 movq %rdi,%rax
60 subq %rsi,%rax
61 cmpq %rcx,%rax /* overlapping && src < dst? */
62 jb reverse
63
64 shrq $3,%rcx /* copy by 64-bit words */
65 cld /* nope, copy forwards */
66 rep
67 movsq
68 movq %rdx,%rcx
69 andq $7,%rcx /* any bytes left? */
70 rep
71 movsb
72 ret
73
74 reverse:
75 addq %rcx,%rdi /* copy backwards */
76 addq %rcx,%rsi
77 decq %rdi
78 decq %rsi
79 andq $7,%rcx /* any fractional bytes? */
80 std
81 rep
82 movsb
83 movq %rdx,%rcx /* copy remainder by 32-bit words */
84 shrq $3,%rcx
85 subq $7,%rsi
86 subq $7,%rdi
87 rep
88 movsq
89 cld
90 ret
91 SET_SIZE(ovbcopy)
92
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