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/* $NetBSD: copystr.S,v 1.8 2002/10/13 14:54:48 bjh21 Exp $ */
/*-
* Copyright (c) 1995 Mark Brinicombe.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Mark Brinicombe.
* 4. The name of the company nor the name of the author may be used to
* endorse or promote products derived from this software without specific
* prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* copystr.S
*
* optimised and fault protected copystr functions
*
* Created : 16/05/95
*/
#include "assym.inc"
#include <machine/asm.h>
#include <machine/armreg.h>
__FBSDID("$FreeBSD$");
#include <sys/errno.h>
.text
.align 2
#if __ARM_ARCH >= 6
#define GET_PCB(tmp) \
mrc p15, 0, tmp, c13, c0, 4; \
add tmp, tmp, #(TD_PCB)
#else
.Lpcb:
.word _C_LABEL(__pcpu) + PC_CURPCB
#define GET_PCB(tmp) \
ldr tmp, .Lpcb
#endif
/*
* r0 - from
* r1 - to
* r2 - maxlens
* r3 - lencopied
*
* Copy string from r0 to r1
*/
ENTRY(copystr)
stmfd sp!, {r4-r5} /* stack is 8 byte aligned */
teq r2, #0x00000000
mov r5, #0x00000000
moveq r0, #ENAMETOOLONG
beq 2f
1: ldrb r4, [r0], #0x0001
add r5, r5, #0x00000001
teq r4, #0x00000000
strb r4, [r1], #0x0001
teqne r5, r2
bne 1b
teq r4, #0x00000000
moveq r0, #0x00000000
movne r0, #ENAMETOOLONG
2: teq r3, #0x00000000
strne r5, [r3]
ldmfd sp!, {r4-r5} /* stack is 8 byte aligned */
RET
END(copystr)
#define SAVE_REGS stmfd sp!, {r4-r6}
#define RESTORE_REGS ldmfd sp!, {r4-r6}
/*
* r0 - user space address
* r1 - kernel space address
* r2 - maxlens
* r3 - lencopied
*
* Copy string from user space to kernel space
*/
ENTRY(copyinstr)
SAVE_REGS
teq r2, #0x00000000
mov r6, #0x00000000
moveq r0, #ENAMETOOLONG
beq 2f
ldr r12, =VM_MAXUSER_ADDRESS
GET_PCB(r4)
ldr r4, [r4]
#ifdef DIAGNOSTIC
teq r4, #0x00000000
beq .Lcopystrpcbfault
#endif
adr r5, .Lcopystrfault
str r5, [r4, #PCB_ONFAULT]
1:
cmp r0, r12
bcs .Lcopystrfault
ldrbt r5, [r0], #0x0001
add r6, r6, #0x00000001
teq r5, #0x00000000
strb r5, [r1], #0x0001
teqne r6, r2
bne 1b
mov r0, #0x00000000
str r0, [r4, #PCB_ONFAULT]
teq r5, #0x00000000
moveq r0, #0x00000000
movne r0, #ENAMETOOLONG
2: teq r3, #0x00000000
strne r6, [r3]
RESTORE_REGS
RET
END(copyinstr)
/*
* r0 - kernel space address
* r1 - user space address
* r2 - maxlens
* r3 - lencopied
*
* Copy string from kernel space to user space
*/
ENTRY(copyoutstr)
SAVE_REGS
teq r2, #0x00000000
mov r6, #0x00000000
moveq r0, #ENAMETOOLONG
beq 2f
ldr r12, =VM_MAXUSER_ADDRESS
GET_PCB(r4)
ldr r4, [r4]
#ifdef DIAGNOSTIC
teq r4, #0x00000000
beq .Lcopystrpcbfault
#endif
adr r5, .Lcopystrfault
str r5, [r4, #PCB_ONFAULT]
1:
cmp r0, r12
bcs .Lcopystrfault
ldrb r5, [r0], #0x0001
add r6, r6, #0x00000001
teq r5, #0x00000000
strbt r5, [r1], #0x0001
teqne r6, r2
bne 1b
mov r0, #0x00000000
str r0, [r4, #PCB_ONFAULT]
teq r5, #0x00000000
moveq r0, #0x00000000
movne r0, #ENAMETOOLONG
2: teq r3, #0x00000000
strne r6, [r3]
RESTORE_REGS
RET
END(copyoutstr)
/* A fault occurred during the copy */
.Lcopystrfault:
mov r1, #0x00000000
str r1, [r4, #PCB_ONFAULT]
mov r0, #EFAULT
RESTORE_REGS
RET
#ifdef DIAGNOSTIC
.Lcopystrpcbfault:
mov r2, r1
mov r1, r0
adr r0, Lcopystrpcbfaulttext
bic sp, sp, #7 /* align stack to 8 bytes */
b _C_LABEL(panic)
Lcopystrpcbfaulttext:
.asciz "No valid PCB during copyinoutstr() addr1=%08x addr2=%08x\n"
.align 2
#endif
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