FreeBSD/Linux Kernel Cross Reference
sys/arm/arm/copystr.S
1 /* $NetBSD: copystr.S,v 1.8 2002/10/13 14:54:48 bjh21 Exp $ */
2
3 /*-
4 * Copyright (c) 1995 Mark Brinicombe.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. All advertising materials mentioning features or use of this software
16 * must display the following acknowledgement:
17 * This product includes software developed by Mark Brinicombe.
18 * 4. The name of the company nor the name of the author may be used to
19 * endorse or promote products derived from this software without specific
20 * prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
23 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
24 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
25 * IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
26 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
27 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
28 * 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 * copystr.S
35 *
36 * optimised and fault protected copystr functions
37 *
38 * Created : 16/05/95
39 */
40
41
42 #include "assym.s"
43 #include <machine/asm.h>
44 #include <machine/armreg.h>
45 #include <machine/asmacros.h>
46 __FBSDID("$FreeBSD: releng/10.0/sys/arm/arm/copystr.S 248361 2013-03-16 02:48:49Z andrew $");
47
48 #include <sys/errno.h>
49
50 .text
51 .align 0
52
53 #ifdef _ARM_ARCH_6
54 #define GET_PCB(tmp) \
55 mrc p15, 0, tmp, c13, c0, 4; \
56 add tmp, tmp, #(PC_CURPCB)
57 #else
58 .Lpcb:
59 .word _C_LABEL(__pcpu) + PC_CURPCB
60
61 #define GET_PCB(tmp) \
62 ldr tmp, .Lpcb
63 #endif
64
65 /*
66 * r0 - from
67 * r1 - to
68 * r2 - maxlens
69 * r3 - lencopied
70 *
71 * Copy string from r0 to r1
72 */
73 ENTRY(copystr)
74 stmfd sp!, {r4-r5} /* stack is 8 byte aligned */
75 teq r2, #0x00000000
76 mov r5, #0x00000000
77 moveq r0, #ENAMETOOLONG
78 beq 2f
79
80 1: ldrb r4, [r0], #0x0001
81 add r5, r5, #0x00000001
82 teq r4, #0x00000000
83 strb r4, [r1], #0x0001
84 teqne r5, r2
85 bne 1b
86
87 teq r4, #0x00000000
88 moveq r0, #0x00000000
89 movne r0, #ENAMETOOLONG
90
91 2: teq r3, #0x00000000
92 strne r5, [r3]
93
94 ldmfd sp!, {r4-r5} /* stack is 8 byte aligned */
95 RET
96 END(copystr)
97
98 #define SAVE_REGS stmfd sp!, {r4-r6}
99 #define RESTORE_REGS ldmfd sp!, {r4-r6}
100
101 /*
102 * r0 - user space address
103 * r1 - kernel space address
104 * r2 - maxlens
105 * r3 - lencopied
106 *
107 * Copy string from user space to kernel space
108 */
109 ENTRY(copyinstr)
110 SAVE_REGS
111
112 teq r2, #0x00000000
113 mov r6, #0x00000000
114 moveq r0, #ENAMETOOLONG
115 beq 2f
116
117 GET_PCB(r4)
118 ldr r4, [r4]
119
120 #ifdef DIAGNOSTIC
121 teq r4, #0x00000000
122 beq .Lcopystrpcbfault
123 #endif
124
125 adr r5, .Lcopystrfault
126 str r5, [r4, #PCB_ONFAULT]
127
128 1: ldrbt r5, [r0], #0x0001
129 add r6, r6, #0x00000001
130 teq r5, #0x00000000
131 strb r5, [r1], #0x0001
132 teqne r6, r2
133 bne 1b
134
135 mov r0, #0x00000000
136 str r0, [r4, #PCB_ONFAULT]
137
138 teq r5, #0x00000000
139 moveq r0, #0x00000000
140 movne r0, #ENAMETOOLONG
141
142 2: teq r3, #0x00000000
143 strne r6, [r3]
144
145 RESTORE_REGS
146 RET
147 END(copyinstr)
148
149 /*
150 * r0 - kernel space address
151 * r1 - user space address
152 * r2 - maxlens
153 * r3 - lencopied
154 *
155 * Copy string from kernel space to user space
156 */
157 ENTRY(copyoutstr)
158 SAVE_REGS
159
160 teq r2, #0x00000000
161 mov r6, #0x00000000
162 moveq r0, #ENAMETOOLONG
163 beq 2f
164
165 GET_PCB(r4)
166 ldr r4, [r4]
167
168 #ifdef DIAGNOSTIC
169 teq r4, #0x00000000
170 beq .Lcopystrpcbfault
171 #endif
172
173 adr r5, .Lcopystrfault
174 str r5, [r4, #PCB_ONFAULT]
175
176 1: ldrb r5, [r0], #0x0001
177 add r6, r6, #0x00000001
178 teq r5, #0x00000000
179 strbt r5, [r1], #0x0001
180 teqne r6, r2
181 bne 1b
182
183 mov r0, #0x00000000
184 str r0, [r4, #PCB_ONFAULT]
185
186 teq r5, #0x00000000
187 moveq r0, #0x00000000
188 movne r0, #ENAMETOOLONG
189
190 2: teq r3, #0x00000000
191 strne r6, [r3]
192
193 RESTORE_REGS
194 RET
195 END(copyoutstr)
196
197 /* A fault occurred during the copy */
198 .Lcopystrfault:
199 mov r1, #0x00000000
200 str r1, [r4, #PCB_ONFAULT]
201 RESTORE_REGS
202 RET
203
204 #ifdef DIAGNOSTIC
205 .Lcopystrpcbfault:
206 mov r2, r1
207 mov r1, r0
208 adr r0, Lcopystrpcbfaulttext
209 bic sp, sp, #7 /* align stack to 8 bytes */
210 b _C_LABEL(panic)
211
212 Lcopystrpcbfaulttext:
213 .asciz "No valid PCB during copyinoutstr() addr1=%08x addr2=%08x\n"
214 .align 0
215 #endif
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