1/* $NetBSD: copystr.S,v 1.8 2002/10/13 14:54:48 bjh21 Exp $ */ 2 3/*- 4 * Copyright (c) 1995 Mark Brinicombe. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 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. 21 * 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 32 * SUCH DAMAGE. 33 * 34 * copystr.S 35 * 36 * optimised and fault protected copystr functions 37 * 38 * Created : 16/05/95 39 */ 40 41#include "assym.inc" 42#include <machine/asm.h> 43#include <machine/armreg.h> 44__FBSDID("$FreeBSD$"); 45 46#include <sys/errno.h> 47 48 .text 49 .align 2 50 51#define GET_PCB(tmp) \ 52 mrc p15, 0, tmp, c13, c0, 4; \ 53 add tmp, tmp, #(TD_PCB) 54 55#define SAVE_REGS stmfd sp!, {r4-r6} 56#define RESTORE_REGS ldmfd sp!, {r4-r6} 57 58/* 59 * r0 - user space address 60 * r1 - kernel space address 61 * r2 - maxlens 62 * r3 - lencopied 63 * 64 * Copy string from user space to kernel space 65 */ 66ENTRY(copyinstr) 67 SAVE_REGS 68 69 teq r2, #0x00000000 70 mov r6, #0x00000000 71 moveq r0, #ENAMETOOLONG 72 beq 2f 73 74 ldr r12, =VM_MAXUSER_ADDRESS 75 76 GET_PCB(r4) 77 ldr r4, [r4] 78 79#ifdef DIAGNOSTIC 80 teq r4, #0x00000000 81 beq .Lcopystrpcbfault 82#endif 83 84 adr r5, .Lcopystrfault 85 str r5, [r4, #PCB_ONFAULT] 86 871: 88 cmp r0, r12 89 bcs .Lcopystrfault 90 ldrbt r5, [r0], #0x0001 91 add r6, r6, #0x00000001 92 teq r5, #0x00000000 93 strb r5, [r1], #0x0001 94 teqne r6, r2 95 bne 1b 96 97 mov r0, #0x00000000 98 str r0, [r4, #PCB_ONFAULT] 99 100 teq r5, #0x00000000 101 moveq r0, #0x00000000 102 movne r0, #ENAMETOOLONG 103 1042: teq r3, #0x00000000 105 strne r6, [r3] 106 107 RESTORE_REGS 108 RET 109END(copyinstr) 110 111/* A fault occurred during the copy */ 112.Lcopystrfault: 113 mov r1, #0x00000000 114 str r1, [r4, #PCB_ONFAULT] 115 mov r0, #EFAULT 116 RESTORE_REGS 117 RET 118 119#ifdef DIAGNOSTIC 120.Lcopystrpcbfault: 121 mov r2, r1 122 mov r1, r0 123 adr r0, Lcopystrpcbfaulttext 124 bic sp, sp, #7 /* align stack to 8 bytes */ 125 b _C_LABEL(panic) 126 127Lcopystrpcbfaulttext: 128 .asciz "No valid PCB during copyinoutstr() addr1=%08x addr2=%08x\n" 129 .align 2 130#endif 131