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use copyin()/copyout() instead of fubyte()/subyte() 

also nuke uvm_useracc() check, copyin()/copyout() do this atomically

XXX only compile-tested
This commit is contained in:
jdolecek 2003-08-02 19:51:23 +00:00
parent dd1c661661
commit e0fe42681d
1 changed files with 7 additions and 8 deletions
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15
sys/compat/linux/arch/mips/linux_machdep.c
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@ -1,4 +1,4 @@
/* $NetBSD: linux_machdep.c,v 1.17 2003/01/18 08:02:49 thorpej Exp $ */
/* $NetBSD: linux_machdep.c,v 1.18 2003/08/02 19:51:23 jdolecek Exp $ */
/*-
* Copyright (c) 1995, 2000, 2001 The NetBSD Foundation, Inc.
@ -37,7 +37,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: linux_machdep.c,v 1.17 2003/01/18 08:02:49 thorpej Exp $");
__KERNEL_RCSID(0, "$NetBSD: linux_machdep.c,v 1.18 2003/08/02 19:51:23 jdolecek Exp $");
#include <sys/param.h>
#include <sys/systm.h>
@ -442,21 +442,20 @@ linux_sys_sysmips(l, v, retval)
case LINUX_MIPS_ATOMIC_SET: {
void *addr;
int s;
u_int8_t value = 0;
addr = (void *)SCARG(uap, arg1);
if ((uvm_useracc((caddr_t)addr, sizeof(int),
B_READ | B_WRITE)) != 1)
return EFAULT;
s = splhigh();
/*
* No error testing here. This is bad, but Linux does
* it like this. The source aknowledge "This is broken"
* in a comment...
*/
*retval = (register_t)fubyte(addr);
error = subyte(addr, SCARG(uap, arg2));
(void) copyin(addr, &value, 1);
*retval = value;
value = (u_int8_t) SCARG(uap, arg2);
error = copyout(&value, addr, 1);
splx(s);
return 0;