211 lines
4.8 KiB
ArmAsm
211 lines
4.8 KiB
ArmAsm
/* $NetBSD: copystr.S,v 1.2 2001/09/28 09:56:03 chris Exp $ */
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/*
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* Copyright (c) 1995 Mark Brinicombe.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Mark Brinicombe.
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* 4. The name of the company nor the name of the author may be used to
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* endorse or promote products derived from this software without specific
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* prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* copystr.S
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*
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* optimised and fault protected copystr functions
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*
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* Created : 16/05/95
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*/
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#include "assym.h"
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#include <machine/asm.h>
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#include <sys/errno.h>
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.text
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.align 0
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Lcurpcb:
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.word _C_LABEL(curpcb)
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Lvm_min_address:
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.word VM_MIN_ADDRESS
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Lvm_maxuser_address:
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.word VM_MAXUSER_ADDRESS
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Lvm_maxkern_address:
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.word VM_MAXKERN_ADDRESS
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/*
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* r0 - from
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* r1 - to
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* r2 - maxlens
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* r3 - lencopied
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*
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* Copy string from r0 to r1
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*/
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ENTRY(copystr)
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stmfd sp!, {r4-r5} /* stack is 8 byte aligned */
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teq r2, #0x00000000
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mov r5, #0x00000000
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moveq r0, #ENAMETOOLONG
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beq Lcopystrexit
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Lcopystr_loop:
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ldrb r4, [r0], #0x0001
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strb r4, [r1], #0x0001
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add r5, r5, #0x00000001
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teq r4, #0x00000000
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teqne r5, r2
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bne Lcopystr_loop
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teq r4, #0x00000000
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moveq r0, #0x00000000
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movne r0, #ENAMETOOLONG
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Lcopystrexit:
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teq r3, #0x00000000
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strne r5, [r3]
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ldmfd sp!, {r4-r5} /* stack is 8 byte aligned */
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mov pc, lr
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/*
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* r0 - user space address
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* r1 - kernel space address
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* r2 - maxlens
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* r3 - lencopied
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*
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* Copy string from user space to kernel space
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*/
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ENTRY(copyinstr)
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stmfd sp!, {r4-r6}
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/* Validate user and kernel addresses */
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ldr r4, Lvm_min_address
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cmp r0, r4
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bcc Lbadaddress
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ldr r4, Lvm_maxuser_address
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cmp r0, r4
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bcs Lbadaddress
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cmp r1, r4
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bcc Lbadaddress
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ldr r4, Lvm_maxkern_address
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cmp r1, r4
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bcs Lbadaddress
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/* Do the actual copy */
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b do_copyinoutstr
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/*
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* r0 - kernel space address
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* r1 - user space address
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* r2 - maxlens
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* r3 - lencopied
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*
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* Copy string from kernel space to user space
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*/
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ENTRY(copyoutstr)
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stmfd sp!, {r4-r6} /* stack isn't 8 byte aligned */
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/* Validate user and kernel addresses */
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ldr r4, Lvm_min_address
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cmp r1, r4
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bcc Lbadaddress
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ldr r4, Lvm_maxuser_address
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cmp r1, r4
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bcs Lbadaddress
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cmp r0, r4
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bcc Lbadaddress
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ldr r4, Lvm_maxkern_address
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cmp r0, r4
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bcs Lbadaddress
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/* Do the actual copy */
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do_copyinoutstr:
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teq r2, #0x00000000
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mov r6, #0x00000000
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moveq r0, #ENAMETOOLONG
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beq Lcopyinoutstrexit
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ldr r4, Lcurpcb
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ldr r4, [r4]
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#ifdef DIAGNOSTIC
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teq r4, #0x00000000
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beq Lcopystrpcbfault
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#endif
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add r5, pc, #Lcopystrfault - . - 8
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str r5, [r4, #PCB_ONFAULT]
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Lcopyinoutstr_loop:
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ldrb r5, [r0], #0x0001
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strb r5, [r1], #0x0001
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add r6, r6, #0x00000001
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teq r5, #0x00000000
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teqne r6, r2
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bne Lcopyinoutstr_loop
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mov r0, #0x00000000
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str r0, [r4, #PCB_ONFAULT]
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teq r5, #0x00000000
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moveq r0, #0x00000000
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movne r0, #ENAMETOOLONG
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Lcopyinoutstrexit:
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teq r3, #0x00000000
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strne r6, [r3]
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ldmfd sp!, {r4-r6} /* stack is 8 byte aligned */
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mov pc, lr
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/* A fault occurred during the copy */
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Lcopystrfault:
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mov r0, #0x00000000
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str r0, [r4, #PCB_ONFAULT]
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/* FALLTHROUGH */
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/* Source or Destination address was bad so fail */
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Lbadaddress:
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ldmfd sp!, {r4-r6} /* stack is 8 byte aligned */
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mov r0, #EFAULT
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mov pc, lr
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#ifdef DIAGNOSTIC
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Lcopystrpcbfault:
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mov r2, r1
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mov r1, r0
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add r0, pc, #Lcopystrpcbfaulttext - . - 8
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bic sp, sp, #7 /* align stack to 8 bytes */
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b _C_LABEL(panic)
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Lcopystrpcbfaulttext:
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.asciz "No valid PCB during copyinoutstr() addr1=%08x addr2=%08x\n"
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.align 0
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#endif
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