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