98 lines
3.2 KiB
C
98 lines
3.2 KiB
C
/* $NetBSD: copyoutstr.c,v 1.2 2002/07/11 01:38:48 simonb Exp $ */
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/*
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* Copyright 2001 Wasabi Systems, Inc.
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* All rights reserved.
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*
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* Written by Eduardo Horvath and Simon Burge for Wasabi Systems, Inc.
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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 for the NetBSD Project by
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* Wasabi Systems, Inc.
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* 4. The name of Wasabi Systems, Inc. may not be used to endorse
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* or promote products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/param.h>
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#include <uvm/uvm_extern.h>
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#include <machine/pcb.h>
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int setfault(faultbuf); /* defined in locore.S */
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int
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copyoutstr(const void *kaddr, void *udaddr, size_t len, size_t *done)
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{
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struct pmap *pm = curproc->p_vmspace->vm_map.pmap;
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int msr, pid, tmp, ctx;
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faultbuf env;
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if (setfault(env)) {
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curpcb->pcb_onfault = 0;
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/* XXXX -- len may be lost on a fault */
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if (done)
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*done = len;
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return EFAULT;
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}
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if (!(ctx = pm->pm_ctx)) {
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/* No context -- assign it one */
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ctx_alloc(pm);
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ctx = pm->pm_ctx;
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}
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if (len) {
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asm volatile("mtctr %3;" /* Set up counter */
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"mfmsr %0;" /* Save MSR */
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"li %1,0x20; "
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"andc %1,%0,%1; mtmsr %1;" /* Disable IMMU */
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"mfpid %1;" /* Save old PID */
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"sync; isync;"
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"li %3,0;" /* Clear len */
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"1:"
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"mtpid %1;sync;"
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"lbz %2,0(%6); addi %6,%6,1;" /* Store kernel byte */
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"sync; isync;"
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"mtpid %4; sync;" /* Load user ctx */
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"stb %2,0(%5); dcbf 0,%5; addi %5,%5,1;" /* Load byte */
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"sync; isync;"
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"addi %3,%3,1;" /* Inc len */
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"or. %2,%2,%2;"
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"bdnzf 2,1b;" /*
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* while(ctr-- && !zero)
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*/
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"2: mtpid %1; mtmsr %0;" /* Restore PID, MSR */
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"sync; isync;"
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: "=&r" (msr), "=&r" (pid), "=&r" (tmp), "+r" (len)
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: "r" (ctx), "r" (udaddr), "r" (kaddr));
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}
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curpcb->pcb_onfault = 0;
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if (done)
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*done = len;
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return 0;
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}
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