1 /* $NetBSD: copystr.S,v 1.8 2002/10/13 14:54:48 bjh21 Exp $ */
4 * Copyright (c) 1995 Mark Brinicombe.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
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.
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
36 * optimised and fault protected copystr functions
43 #include <machine/asm.h>
44 #include <machine/armreg.h>
45 #include <machine/asmacros.h>
46 __FBSDID("$FreeBSD$");
48 #include <sys/errno.h>
54 #define GET_PCB(tmp) \
55 mrc p15, 0, tmp, c13, c0, 4; \
56 add tmp, tmp, #(PC_CURPCB)
59 .word _C_LABEL(__pcpu) + PC_CURPCB
61 #define GET_PCB(tmp) \
71 * Copy string from r0 to r1
74 stmfd sp!, {r4-r5} /* stack is 8 byte aligned */
77 moveq r0, #ENAMETOOLONG
80 1: ldrb r4, [r0], #0x0001
81 add r5, r5, #0x00000001
83 strb r4, [r1], #0x0001
89 movne r0, #ENAMETOOLONG
91 2: teq r3, #0x00000000
94 ldmfd sp!, {r4-r5} /* stack is 8 byte aligned */
98 #define SAVE_REGS stmfd sp!, {r4-r6}
99 #define RESTORE_REGS ldmfd sp!, {r4-r6}
102 * r0 - user space address
103 * r1 - kernel space address
107 * Copy string from user space to kernel space
114 moveq r0, #ENAMETOOLONG
122 beq .Lcopystrpcbfault
125 adr r5, .Lcopystrfault
126 str r5, [r4, #PCB_ONFAULT]
128 1: ldrbt r5, [r0], #0x0001
129 add r6, r6, #0x00000001
131 strb r5, [r1], #0x0001
136 str r0, [r4, #PCB_ONFAULT]
139 moveq r0, #0x00000000
140 movne r0, #ENAMETOOLONG
142 2: teq r3, #0x00000000
150 * r0 - kernel space address
151 * r1 - user space address
155 * Copy string from kernel space to user space
162 moveq r0, #ENAMETOOLONG
170 beq .Lcopystrpcbfault
173 adr r5, .Lcopystrfault
174 str r5, [r4, #PCB_ONFAULT]
176 1: ldrb r5, [r0], #0x0001
177 add r6, r6, #0x00000001
179 strbt r5, [r1], #0x0001
184 str r0, [r4, #PCB_ONFAULT]
187 moveq r0, #0x00000000
188 movne r0, #ENAMETOOLONG
190 2: teq r3, #0x00000000
197 /* A fault occurred during the copy */
200 str r1, [r4, #PCB_ONFAULT]
208 adr r0, Lcopystrpcbfaulttext
209 bic sp, sp, #7 /* align stack to 8 bytes */
212 Lcopystrpcbfaulttext:
213 .asciz "No valid PCB during copyinoutstr() addr1=%08x addr2=%08x\n"