brickos: lib/mint/mulsi3.c Source File

00001 /*
00002  *  mulsi3.c
00003  *
00004  *  Wrapper for ROM mulsi3 routine, a 32-bit multiply: r0r1 *= r2r3
00005  *
00006  *  The contents of this file are subject to the Mozilla Public License
00007  *  Version 1.0 (the "License"); you may not use this file except in
00008  *  compliance with the License. You may obtain a copy of the License at
00009  *  http://www.mozilla.org/MPL/
00010  *
00011  *  Software distributed under the License is distributed on an "AS IS"
00012  *  basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
00013  *  License for the specific language governing rights and limitations
00014  *  under the License.
00015  *
00016  *  The Original Code is Librcx code, released February 9, 1999.
00017  *
00018  *  The Initial Developer of the Original Code is Kekoa Proudfoot.
00019  *  Portions created by Kekoa Proudfoot are Copyright (C) 1999
00020  *  Kekoa Proudfoot. All Rights Reserved.
00021  *
00022  *  Contributor(s): Kekoa Proudfoot <kekoa@graphics.stanford.edu>
00023  */
00024 
00025 __asm__ (
00026     ".section .text\n\t"
00027     ".global ___mulsi3\n"
00028     "___mulsi3:\n\t"
00029     "push r4\n\t"
00030     "push r5\n\t"
00031     "push r6\n\t"
00032     "mov.w r1,r6\n\t"
00033     "mov.w r0,r5\n\t"
00034     "mov.w r3,r4\n\t"
00035     "mov.w r2,r3\n\t"
00036     "jsr @@84\n\t"
00037     "mov.w r6,r1\n\t"
00038     "mov.w r5,r0\n\t"
00039     "pop r6\n\t"
00040     "pop r5\n\t"
00041     "pop r4\n\t"
00042     "rts"
00043 );