1 /* $NetBSD: copyoutstr.c,v 1.2 2002/07/11 01:38:48 simonb Exp $ */ 2 3 /* 4 * Copyright 2001 Wasabi Systems, Inc. 5 * All rights reserved. 6 * 7 * Written by Eduardo Horvath and Simon Burge for Wasabi Systems, Inc. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed for the NetBSD Project by 20 * Wasabi Systems, Inc. 21 * 4. The name of Wasabi Systems, Inc. may not be used to endorse 22 * or promote products derived from this software without specific prior 23 * written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 27 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 28 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC 29 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 35 * POSSIBILITY OF SUCH DAMAGE. 36 */ 37 38 #include <sys/param.h> 39 #include <uvm/uvm_extern.h> 40 #include <machine/pcb.h> 41 42 int setfault(faultbuf); /* defined in locore.S */ 43 44 int 45 copyoutstr(const void *kaddr, void *udaddr, size_t len, size_t *done) 46 { 47 struct pmap *pm = curproc->p_vmspace->vm_map.pmap; 48 int msr, pid, tmp, ctx; 49 faultbuf env; 50 51 if (setfault(env)) { 52 curpcb->pcb_onfault = 0; 53 /* XXXX -- len may be lost on a fault */ 54 if (done) 55 *done = len; 56 return EFAULT; 57 } 58 59 if (!(ctx = pm->pm_ctx)) { 60 /* No context -- assign it one */ 61 ctx_alloc(pm); 62 ctx = pm->pm_ctx; 63 } 64 65 if (len) { 66 asm volatile("mtctr %3;" /* Set up counter */ 67 "mfmsr %0;" /* Save MSR */ 68 "li %1,0x20; " 69 "andc %1,%0,%1; mtmsr %1;" /* Disable IMMU */ 70 "mfpid %1;" /* Save old PID */ 71 "sync; isync;" 72 73 "li %3,0;" /* Clear len */ 74 75 "1:" 76 "mtpid %1;sync;" 77 "lbz %2,0(%6); addi %6,%6,1;" /* Store kernel byte */ 78 "sync; isync;" 79 "mtpid %4; sync;" /* Load user ctx */ 80 "stb %2,0(%5); dcbf 0,%5; addi %5,%5,1;" /* Load byte */ 81 "sync; isync;" 82 "addi %3,%3,1;" /* Inc len */ 83 "or. %2,%2,%2;" 84 "bdnzf 2,1b;" /* 85 * while(ctr-- && !zero) 86 */ 87 88 "2: mtpid %1; mtmsr %0;" /* Restore PID, MSR */ 89 "sync; isync;" 90 : "=&r" (msr), "=&r" (pid), "=&r" (tmp), "+r" (len) 91 : "r" (ctx), "r" (udaddr), "r" (kaddr)); 92 } 93 curpcb->pcb_onfault = 0; 94 if (done) 95 *done = len; 96 return 0; 97 } 98