/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2005 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
#include <sys/types.h>
#include <sys/systm.h>
#include <sys/door.h>
#include <sys/stack.h>
#include <sys/errno.h>
#include <sys/sysmacros.h>
int
door_finish_dispatch(caddr_t newsp)
{
void lwp_setsp(klwp_t *, caddr_t);
void lwp_clear_uwin(void);
char bytes[MAX(MINFRAME, MINFRAME32)];
size_t count;
caddr_t biased_sp;
if (get_udatamodel() == DATAMODEL_NATIVE) {
count = MINFRAME;
biased_sp = newsp - STACK_BIAS;
} else {
count = MINFRAME32;
biased_sp = newsp;
}
/*
* We carefully zero out the stack frame we're pointing %sp at.
* This means that, upon returning to userland, the ins and locals
* will be zeroed, instead of acquiring whatever garbage was on the
* stack previously. In particular, this makes sure %fp is NULL,
* so that stack traces are properly terminated.
*/
bzero(bytes, count);
if (copyout(bytes, newsp, count) != 0)
return (E2BIG);
/*
* There may be some user register windows stashed away
* because our user thread stack wasn't available during some
* kernel overflows. We don't care about this saved user
* state since we are resetting our stack. Make sure we
* don't try to push these registers out to our stack
* later on when returning from this system call.
*
* We have guaranteed that no new user windows will be stored
* to the pcb save area at this point since a door server
* thread always does a full context switch (shuttle_switch,
* shuttle_resume) before making itself available for a door
* invocation.
*/
lwp_clear_uwin();
lwp_setsp(ttolwp(curthread), biased_sp);
return (0);
}
uintptr_t
door_final_sp(uintptr_t resultsp, size_t align, int datamodel)
{
size_t minframe = (datamodel == DATAMODEL_NATIVE)?
MINFRAME : MINFRAME32;
return (P2ALIGN(resultsp - minframe, align));
}