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
42 #include <machine/asm.h>
43 #include <machine/armreg.h>
44 __FBSDID("$FreeBSD$");
46 #include <sys/errno.h>
52 #define GET_PCB(tmp) \
53 mrc p15, 0, tmp, c13, c0, 4; \
54 add tmp, tmp, #(TD_PCB)
57 .word _C_LABEL(__pcpu) + PC_CURPCB
59 #define GET_PCB(tmp) \
69 * Copy string from r0 to r1
72 stmfd sp!, {r4-r5} /* stack is 8 byte aligned */
75 moveq r0, #ENAMETOOLONG
78 1: ldrb r4, [r0], #0x0001
79 add r5, r5, #0x00000001
81 strb r4, [r1], #0x0001
87 movne r0, #ENAMETOOLONG
89 2: teq r3, #0x00000000
92 ldmfd sp!, {r4-r5} /* stack is 8 byte aligned */
96 #define SAVE_REGS stmfd sp!, {r4-r6}
97 #define RESTORE_REGS ldmfd sp!, {r4-r6}
100 * r0 - user space address
101 * r1 - kernel space address
105 * Copy string from user space to kernel space
112 moveq r0, #ENAMETOOLONG
115 ldr r12, =VM_MAXUSER_ADDRESS
122 beq .Lcopystrpcbfault
125 adr r5, .Lcopystrfault
126 str r5, [r4, #PCB_ONFAULT]
131 ldrbt r5, [r0], #0x0001
132 add r6, r6, #0x00000001
134 strb r5, [r1], #0x0001
139 str r0, [r4, #PCB_ONFAULT]
142 moveq r0, #0x00000000
143 movne r0, #ENAMETOOLONG
145 2: teq r3, #0x00000000
153 * r0 - kernel space address
154 * r1 - user space address
158 * Copy string from kernel space to user space
165 moveq r0, #ENAMETOOLONG
168 ldr r12, =VM_MAXUSER_ADDRESS
175 beq .Lcopystrpcbfault
178 adr r5, .Lcopystrfault
179 str r5, [r4, #PCB_ONFAULT]
184 ldrb r5, [r0], #0x0001
185 add r6, r6, #0x00000001
187 strbt r5, [r1], #0x0001
192 str r0, [r4, #PCB_ONFAULT]
195 moveq r0, #0x00000000
196 movne r0, #ENAMETOOLONG
198 2: teq r3, #0x00000000
205 /* A fault occurred during the copy */
208 str r1, [r4, #PCB_ONFAULT]
217 adr r0, Lcopystrpcbfaulttext
218 bic sp, sp, #7 /* align stack to 8 bytes */
221 Lcopystrpcbfaulttext:
222 .asciz "No valid PCB during copyinoutstr() addr1=%08x addr2=%08x\n"