327 lines
6.3 KiB
ArmAsm
327 lines
6.3 KiB
ArmAsm
/* $NetBSD: fusu.S,v 1.2 2009/01/18 16:42:09 bjh21 Exp $ */
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/*
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* Copyright (c) 1996-1998 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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#include "opt_multiprocessor.h"
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#include "opt_cpuoptions.h"
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#include "assym.h"
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#include <machine/asm.h>
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#include <machine/cpu.h>
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/*
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* On PROG26 systems (i.e. acorn26) taking a page fault corrupts R14_svc.
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* To prevent this causing a problem, we save R14 in R12 in these functions.
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*/
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#ifdef __PROG26
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#define SAVE_R14 mov ip, lr
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#define FUSU_RET mov pc, ip
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#else
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#define SAVE_R14 /* do nothing */
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#define FUSU_RET mov pc, lr
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#endif
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/*
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* fuword(void *uaddr);
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* Fetch an int from the user's address space.
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*/
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ENTRY(fuword)
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SAVE_R14
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GET_CURPCB(r2)
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#ifdef DIAGNOSTIC
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teq r2, #0x00000000
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beq .Lfusupcbfault
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#endif
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adr r1, .Lfusufault
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str r1, [r2, #PCB_ONFAULT]
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ldrt r3, [r0]
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mov r1, #0x00000000
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str r1, [r2, #PCB_ONFAULT]
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mov r0, r3
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FUSU_RET
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/*
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* fusword(void *uaddr);
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* Fetch a short from the user's address space.
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*/
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ENTRY(fusword)
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SAVE_R14
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GET_CURPCB(r2)
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#ifdef DIAGNOSTIC
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teq r2, #0x00000000
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beq .Lfusupcbfault
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#endif
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adr r1, .Lfusufault
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str r1, [r2, #PCB_ONFAULT]
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ldrbt r3, [r0], #1
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ldrbt r1, [r0]
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#ifdef __ARMEB__
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orr r0, r1, r3, asl #8
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#else
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orr r0, r3, r1, asl #8
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#endif
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mov r1, #0x00000000
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str r1, [r2, #PCB_ONFAULT]
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FUSU_RET
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/*
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* fuswintr(void *uaddr);
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* Fetch a short from the user's address space. Can be called during an
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* interrupt.
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*/
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ENTRY(fuswintr)
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ldr r2, Lblock_userspace_access
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ldr r2, [r2]
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teq r2, #0
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mvnne r0, #0x00000000
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movne pc, lr
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SAVE_R14
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GET_CURPCB(r2)
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#ifdef DIAGNOSTIC
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teq r2, #0x00000000
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beq .Lfusupcbfault
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#endif
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adr r1, _C_LABEL(fusubailout)
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str r1, [r2, #PCB_ONFAULT]
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ldrbt r3, [r0], #1
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ldrbt r1, [r0]
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#ifdef __ARMEB__
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orr r0, ip, r1, asl #8
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#else
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orr r0, r1, ip, asl #8
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#endif
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mov r1, #0x00000000
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str r1, [r2, #PCB_ONFAULT]
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FUSU_RET
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Lblock_userspace_access:
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.word _C_LABEL(block_userspace_access)
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.data
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.align 0
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.global _C_LABEL(block_userspace_access)
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_C_LABEL(block_userspace_access):
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.word 0
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.text
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/*
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* fubyte(void *uaddr);
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* Fetch a byte from the user's address space.
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*/
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ENTRY(fubyte)
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SAVE_R14
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GET_CURPCB(r2)
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#ifdef DIAGNOSTIC
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teq r2, #0x00000000
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beq .Lfusupcbfault
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#endif
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adr r1, .Lfusufault
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str r1, [r2, #PCB_ONFAULT]
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ldrbt r3, [r0]
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mov r1, #0x00000000
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str r1, [r2, #PCB_ONFAULT]
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mov r0, r3
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FUSU_RET
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/*
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* Handle faults from [fs]u*(). Clean up and return -1.
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*/
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.Lfusufault:
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mov r0, #0x00000000
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str r0, [r2, #PCB_ONFAULT]
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mvn r0, #0x00000000
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FUSU_RET
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/*
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* Handle faults from [fs]u*(). Clean up and return -1. This differs from
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* fusufault() in that trap() will recognise it and return immediately rather
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* than trying to page fault.
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*/
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/* label must be global as fault.c references it */
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.global _C_LABEL(fusubailout)
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_C_LABEL(fusubailout):
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mov r0, #0x00000000
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str r0, [r2, #PCB_ONFAULT]
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mvn r0, #0x00000000
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FUSU_RET
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#ifdef DIAGNOSTIC
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/*
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* Handle earlier faults from [fs]u*(), due to no pcb
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*/
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.Lfusupcbfault:
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mov r1, r0
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adr r0, fusupcbfaulttext
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b _C_LABEL(panic)
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fusupcbfaulttext:
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.asciz "Yikes - no valid PCB during fusuxxx() addr=%08x\n"
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.align 0
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#endif
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/*
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* suword(void *uaddr, int x);
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* Store an int in the user's address space.
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*/
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ENTRY(suword)
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SAVE_R14
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GET_CURPCB(r2)
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#ifdef DIAGNOSTIC
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teq r2, #0x00000000
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beq .Lfusupcbfault
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#endif
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adr r3, .Lfusufault
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str r3, [r2, #PCB_ONFAULT]
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strt r1, [r0]
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mov r0, #0x00000000
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str r0, [r2, #PCB_ONFAULT]
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FUSU_RET
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/*
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* suswintr(void *uaddr, short x);
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* Store a short in the user's address space. Can be called during an
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* interrupt.
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*/
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ENTRY(suswintr)
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ldr r2, Lblock_userspace_access
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ldr r2, [r2]
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teq r2, #0
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mvnne r0, #0x00000000
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movne pc, lr
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SAVE_R14
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GET_CURPCB(r2)
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#ifdef DIAGNOSTIC
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teq r2, #0x00000000
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beq .Lfusupcbfault
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#endif
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adr r3, _C_LABEL(fusubailout)
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str r3, [r2, #PCB_ONFAULT]
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#ifdef __ARMEB__
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mov r3, r1, lsr #8
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strbt r3, [r0], #1
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#else
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strbt r1, [r0], #1
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mov r1, r1, lsr #8
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#endif
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strbt r1, [r0]
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mov r0, #0x00000000
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str r0, [r2, #PCB_ONFAULT]
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FUSU_RET
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/*
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* susword(void *uaddr, short x);
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* Store a short in the user's address space.
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*/
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ENTRY(susword)
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SAVE_R14
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GET_CURPCB(r2)
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#ifdef DIAGNOSTIC
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teq r2, #0x00000000
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beq .Lfusupcbfault
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#endif
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adr r3, .Lfusufault
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str r3, [r2, #PCB_ONFAULT]
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#ifdef __ARMEB__
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mov r3, r1, lsr #8
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strbt r3, [r0], #1
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#else
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strbt r1, [r0], #1
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mov r1, r1, lsr #8
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#endif
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strbt r1, [r0]
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mov r0, #0x00000000
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str r0, [r2, #PCB_ONFAULT]
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FUSU_RET
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/*
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* subyte(void *uaddr, char x);
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* Store a byte in the user's address space.
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*/
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ENTRY(subyte)
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SAVE_R14
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GET_CURPCB(r2)
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#ifdef DIAGNOSTIC
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teq r2, #0x00000000
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beq .Lfusupcbfault
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#endif
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adr r3, .Lfusufault
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str r3, [r2, #PCB_ONFAULT]
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strbt r1, [r0]
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mov r0, #0x00000000
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str r0, [r2, #PCB_ONFAULT]
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FUSU_RET
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