1 /* $NetBSD: copy.S,v 1.5 2007/10/17 19:55:37 garbled Exp $ */
2
3 /*-
4 * Copyright (c) 1992, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * Digital Equipment Corporation and Ralph Campbell.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 *
34 * Copyright (C) 1989 Digital Equipment Corporation.
35 * Permission to use, copy, modify, and distribute this software and
36 * its documentation for any purpose and without fee is hereby granted,
37 * provided that the above copyright notice appears in all copies.
38 * Digital Equipment Corporation makes no representations about the
39 * suitability of this software for any purpose. It is provided "as is"
40 * without express or implied warranty.
41 *
42 * from: Header: /sprite/src/kernel/mach/ds3100.md/RCS/loMem.s,
43 * v 1.1 89/07/11 17:55:04 nelson Exp SPRITE (DECWRL)
44 * from: Header: /sprite/src/kernel/mach/ds3100.md/RCS/machAsm.s,
45 * v 9.2 90/01/29 18:00:39 shirriff Exp SPRITE (DECWRL)
46 * from: Header: /sprite/src/kernel/vm/ds3100.md/vmPmaxAsm.s,
47 * v 1.1 89/07/10 14:27:41 nelson Exp SPRITE (DECWRL)
48 *
49 * @(#)locore.s 8.5 (Berkeley) 1/4/94
50 */
51
52 #include "assym.s"
53 #include <machine/asm.h>
54 #include <machine/asmacros.h>
55 __FBSDID("$FreeBSD: releng/8.0/sys/mips/mips/copystr.S 178217 2008-04-15 05:31:19Z imp $");
56
57 #include <sys/errno.h>
58
59 /*
60 * copystr(9)
61 * <v0>int copystr(<a0>const void *src, <a1>void *dst, <a2>size_t len,
62 * <a3>size_t *done)
63 */
64 ENTRY(copystr)
65 .set noreorder
66 .set noat
67 move v0, zero
68 beqz a2, 2f
69 move t1, zero
70 1: subu a2, 1
71 lbu t0, 0(a0)
72 addu a0, 1
73 sb t0, 0(a1)
74 addu a1, 1
75 beqz t0, 3f /* NULL - end of string*/
76 addu t1, 1
77 bnez a2, 1b
78 nop
79 2: /* ENAMETOOLONG */
80 li v0, ENAMETOOLONG
81 3: /* done != NULL -> how many bytes were copied */
82 beqz a3, 4f
83 nop
84 sw t1, 0(a3)
85 4: jr ra
86 nop
87 .set reorder
88 .set at
89 END(copystr)
90
91 /*
92 * int copyinstr(void *uaddr, void *kaddr, size_t maxlen, size_t *lencopied)
93 * Copy a NIL-terminated string, at most maxlen characters long, from the
94 * user's address space. Return the number of characters copied (including
95 * the NIL) in *lencopied. If the string is too long, return ENAMETOOLONG;
96 * else return 0 or EFAULT.
97 */
98 LEAF(copyinstr)
99 .set noreorder
100 .set noat
101 lw t2, pcpup
102 lw v1, PC_CURPCB(t2)
103 la v0, _C_LABEL(copystrerr)
104 blt a0, zero, _C_LABEL(copystrerr)
105 sw v0, PCB_ONFAULT(v1)
106 move t0, a2
107 beq a2, zero, 4f
108 1:
109 lbu v0, 0(a0)
110 subu a2, a2, 1
111 beq v0, zero, 2f
112 sb v0, 0(a1)
113 addu a0, a0, 1
114 bne a2, zero, 1b
115 addu a1, a1, 1
116 4:
117 li v0, ENAMETOOLONG
118 2:
119 beq a3, zero, 3f
120 subu a2, t0, a2
121 sw a2, 0(a3)
122 3:
123 j ra # v0 is 0 or ENAMETOOLONG
124 sw zero, PCB_ONFAULT(v1)
125 .set reorder
126 .set at
127 END(copyinstr)
128
129 /*
130 * int copyoutstr(void *uaddr, void *kaddr, size_t maxlen, size_t *lencopied);
131 * Copy a NIL-terminated string, at most maxlen characters long, into the
132 * user's address space. Return the number of characters copied (including
133 * the NIL) in *lencopied. If the string is too long, return ENAMETOOLONG;
134 * else return 0 or EFAULT.
135 */
136 LEAF(copyoutstr)
137 .set noreorder
138 .set noat
139 lw t2, pcpup
140 lw v1, PC_CURPCB(t2)
141 la v0, _C_LABEL(copystrerr)
142 blt a1, zero, _C_LABEL(copystrerr)
143 sw v0, PCB_ONFAULT(v1)
144 move t0, a2
145 beq a2, zero, 4f
146 1:
147 lbu v0, 0(a0)
148 subu a2, a2, 1
149 beq v0, zero, 2f
150 sb v0, 0(a1)
151 addu a0, a0, 1
152 bne a2, zero, 1b
153 addu a1, a1, 1
154 4:
155 li v0, ENAMETOOLONG
156 2:
157 beq a3, zero, 3f
158 subu a2, t0, a2
159 sw a2, 0(a3)
160 3:
161 j ra # v0 is 0 or ENAMETOOLONG
162 sw zero, PCB_ONFAULT(v1)
163 .set reorder
164 .set at
165 END(copyoutstr)
166
167 LEAF(copystrerr)
168 sw zero, PCB_ONFAULT(v1)
169 j ra
170 li v0, EFAULT # return EFAULT
171 END(copystrerr)
Cache object: 8b6ac908b0219c25540f874530e7a785
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