runexe.s revision 80e2ca8596e3435bc3b76f3c597833ea0a87f85e
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (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
*/
/*
*/
#include <sys/asm_linkage.h>
#include <brand_misc.h>
#if defined(lint)
/*ARGSUSED*/
void
{
}
#else /* lint */
.section ".text"
/*
* Prepare to jump to the target program we actually want to run.
* If this program is dynamically linked then we'll be jumping to
* another copy of the linker. If it's a statically linked program
* we'll be jumping directy to it's main entry point. In any case,
* we need to reset our current state stack and register state to
* something similar to the initial process state setup by the kernel
* and documented at:
*
* Of course this is the same stack format as when this executable
* was first started, so here we'll just roll back the stack and
* frame pointers to their values when this processes first started
* execution.
*
* Our input parameters are stored in the %o? registers since we
* don't bother to allocate a new stack frame.
*/
/*
* We also have to make sure to clear %g1 since nornally ld.so.1 will
* set that to non-zero if there is an exit function that should be
* invoked when the process is terminating. This isn't actually
* necessary if the target program we're jumping to is a dynamically
* linked program since in that case we're actually jumping to another
* copy of ld.so.1 and it will just reset %g1, but if the target
* program we're jumping to is a statically linked binary that uses
* the standard sun compiler supplied crt1.o`_start(), it will check
* to see if %g1 is set.
*/
/*
* target will never return.
*/
#endif /* lint */