/*
 * 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
 * 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 (c) 2010, Oracle and/or its affiliates. All rights reserved.
 */

#include <sys/asm_linkage.h>
#include <sys/link.h>

#if defined(lint)

void
_start(void)
{
}

#else   /* lint */
        .section        ".text"
        /*
         * Initial entry point for the brand emulation library.
         *
         * This platform specific assembly entry point exists just to invoke
         * the common brand library startup routine.  That routine expects to
         * be called with the following arguments:
         *      brand_init(int argc, char *argv[], char *envp[])
         *
         * There are no arguments explicitly passed to this entry point,
         * routine, but we do know how our initial stack has been setup by
         * the kernel.  The stack format is documented in:
         *      usr/src/cmd/sgs/rtld/sparc/boot.s
         *      usr/src/cmd/sgs/rtld/sparcv9/boot.s
         *
         * So this routine will troll through the stack to setup the argument
         * values for the common brand library startup routine and then invoke
         * it.
         */
        ENTRY_NP(_start)
#if defined (__sparcv9)
        save    %sp, -SA(MINFRAME + EB_MAX_SIZE64), %sp
#else /* !__sparcv9 */
        save    %sp, -SA(MINFRAME + EB_MAX_SIZE32), %sp
#endif /* !__sparcv9 */

        /* get argc */
        ldn     [%fp + WINDOWSIZE + STACK_BIAS], %o0

        /* get argv */
        add     %fp, + WINDOWSIZE + CPTRSIZE + STACK_BIAS, %o1

        /* get envp */
        add     %o0, 1, %l0             ! add 1 to argc for last element of 0
        sll     %l0, CPTRSHIFT, %l0     ! multiply argc by pointer size
        add     %o1, %l0, %o2           !  and add to argv to get first env ptr

        call    brand_init
        nop

        /*NOTREACHED*/
        SET_SIZE(_start)
#endif  /* lint */