/*
* 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
* 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 2004 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
#include <sys/asm_linkage.h>
#include <mdb/mdb_kreg.h>
/*
* Kernel function call invocation
*/
#if !defined(__lint)
.align 8
/*
* A jump table containing the addresses for register argument copy
* code.
*/
#endif /* __lint */
#if defined(__lint)
/*ARGSUSED*/
{
return (0);
}
#else
/*
* Will registers suffice, or do we need to put excess args (>6) on the
* stack?
*/
/*
* We have fewer than six arguments. Below, starting at the cp6arg
* label, we've got code that'll copy these arguments to the out
* registers in descending order (%o5 is copied, then %o4, and so on).
* We only want to move valid arguments, so we'll jump into this copy
* code just before it copies our highest arg. If we have four args,
* for example, we'll jump to cp4arg.
*
* %i6 is now a negative word-scaled offset, which we can use to
* retrieve the appropriate address from the jump table. We start at
* bottom of the table, and let the negative offset jump back to the
* correct location. If we have four arguments, %i1 will be -16.
* Starting from copyargs+48 (the address of the last slot), we get
* copyargs+32, which contains the address (cp4arg) to be used to copy
* four arguments.
*/
/*
* We have more than six arguments, and will thus need to allocate space
* for the seventh and beyond on the stack. %i1 is the number of bytes
* needed to hold the seventh and higher arguments.
*/
/* Allocate swap space - %i1 rounded up to STACK_ALIGN */
/*
* Copy arguments to the stack. %i1 is the offset from the seventh arg
* in argv and the offset from the base of the stack save area.
*/
1:
/*
* Copy the register arguments. The argc <= 6 case will be jumping to
* one of these labels.
*/
#endif