/*      $NetBSD: startprog.S,v 1.8 2011/01/10 15:25:44 tsutsui Exp $    */

/*-
* Copyright (c) 1999 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Jonathan Stone, Michael Hitch and Simon Burge.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/

/*
* startprog(entry, stack, argc, argv, prom_magic, prom_ptr, bi_magic, bi_ptr);
*
* load new stack pointer, then call
*  entry(argc, argv, prom_magic, prom_ptr, bi_magic, bi_ptr);
*/

#include <mips/asm.h>

       .set    noreorder
LEAF(startprog)
       subu    sp,sp,CALLFRAME_SIZ
       addu    t2,a1,-CALLFRAME_SIZ    # new stack value
       move    t9,a0
       move    a0,a2
       move    a1,a3

#ifdef __mips_o32
       lw      a2,CALLFRAME_SIZ+16(sp) # load everything from old stack we need
       lw      a3,CALLFRAME_SIZ+20(sp)
       lw      $8,CALLFRAME_SIZ+24(sp) # use a4/t0 in case N32/N64 kernel
       lw      $9,CALLFRAME_SIZ+28(sp) # use a5/t1 in case N32/N64 kernel
#else
       move    a2,a4
       move    a3,a5
       move    a4,a6
       move    a5,a7
#endif

       move    sp,t2                   # new stack pointer
       sw      ra,CALLFRAME_RA(sp)

       sw      $8,16(sp)               # save on stack for O32
       sw      $9,20(sp)               # save on stack for O32
       jal     ra,t9
        nop                            # BDslot

       lw      ra,CALLFRAME_RA(sp)     # should not get back here!
       j       ra
        addu   sp,sp,CALLFRAME_SIZ
END(startprog)