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#if __ARM_ARCH >= 6 52#define GET_PCB(tmp) \ 53 mrc p15, 0, tmp, c13, c0, 4; \ 54 add tmp, tmp, #(TD_PCB) 55#else 56.Lpcb: 57 .word _C_LABEL(__pcpu) + PC_CURPCB 58 59#define GET_PCB(tmp) \ 60 ldr tmp, .Lpcb 61#endif 62 63#define SAVE_REGS stmfd sp!, {r4-r6} 64#define RESTORE_REGS ldmfd sp!, {r4-r6} 65 66/* 67 * r0 - user space address 68 * r1 - kernel space address 69 * r2 - maxlens 70 * r3 - lencopied 71 * 72 * Copy string from user space to kernel space 73 */ 74ENTRY(copyinstr) 75 SAVE_REGS 76 77 teq r2, #0x00000000 78 mov r6, #0x00000000 79 moveq r0, #ENAMETOOLONG 80 beq 2f 81 82 ldr r12, =VM_MAXUSER_ADDRESS 83 84 GET_PCB(r4) 85 ldr r4, [r4] 86 87#ifdef DIAGNOSTIC 88 teq r4, #0x00000000 89 beq .Lcopystrpcbfault 90#endif 91 92 adr r5, .Lcopystrfault 93 str r5, [r4, #PCB_ONFAULT] 94 951: 96 cmp r0, r12 97 bcs .Lcopystrfault 98 ldrbt r5, [r0], #0x0001 99 add r6, r6, #0x00000001 100 teq r5, #0x00000000 101 strb r5, [r1], #0x0001 102 teqne r6, r2 103 bne 1b 104 105 mov r0, #0x00000000 106 str r0, [r4, #PCB_ONFAULT] 107 108 teq r5, #0x00000000 109 moveq r0, #0x00000000 110 movne r0, #ENAMETOOLONG 111 1122: teq r3, #0x00000000 113 strne r6, [r3] 114 115 RESTORE_REGS 116 RET 117END(copyinstr) 118 119/* A fault occurred during the copy */ 120.Lcopystrfault: 121 mov r1, #0x00000000 122 str r1, [r4, #PCB_ONFAULT] 123 mov r0, #EFAULT 124 RESTORE_REGS 125 RET 126 127#ifdef DIAGNOSTIC 128.Lcopystrpcbfault: 129 mov r2, r1 130 mov r1, r0 131 adr r0, Lcopystrpcbfaulttext 132 bic sp, sp, #7 /* align stack to 8 bytes */ 133 b _C_LABEL(panic) 134 135Lcopystrpcbfaulttext: 136 .asciz "No valid PCB during copyinoutstr() addr1=%08x addr2=%08x\n" 137 .align 2 138#endif 139