16bitops.c

00001 /**
00002 <Copyright Header>
00003 Copyright (c) 2013 Jordan "Earlz" Earls  <http://Earlz.net>
00004 All rights reserved.
00005 
00006 Redistribution and use in source and binary forms, with or without
00007 modification, are permitted provided that the following conditions
00008 are met:
00009 
00010 1. Redistributions of source code must retain the above copyright
00011   notice, this list of conditions and the following disclaimer.
00012 2. Redistributions in binary form must reproduce the above copyright
00013   notice, this list of conditions and the following disclaimer in the
00014   documentation and/or other materials provided with the distribution.
00015 3. The name of the author may not be used to endorse or promote products
00016   derived from this software without specific prior written permission.
00017 
00018 THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
00019 INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
00020 AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
00021 THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
00022 EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
00023 PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
00024 OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
00025 WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
00026 OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
00027 ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
00028 </Copyright Header>
00029 **/
00030 
00031 #include "lightvm.h"
00032 
00033 void op16_single_arg(lightvm_state* s, uint16_t op, uint16_t* arg2)
00034 {
00035     unsigned int secondary=op & 0xF000 >> 12;
00036     switch(secondary)
00037     {
00038         case 0:
00039         //push
00040         lightvm_push(s, *arg2);
00041         break;
00042         case 1:
00043         //pop
00044         *arg2 = lightvm_pop(s);
00045         break;
00046         case 2:
00047         //not
00048         *arg2 = ~(*arg2);
00049         break;
00050         case 3:
00051         //unused
00052         case 4:
00053         //unused
00054         case 5:
00055         //unused
00056         case 6:
00057         //xcall?
00058         case 7:
00059         //and.eq
00060         *s->tr &= *s->cr == *arg2;
00061         break;
00062         case 8:
00063         //or.eq
00064         *s->tr |= *s->cr == *arg2;
00065         break;
00066         case 9:
00067         //and.neq
00068         *s->tr &= *s->cr != *arg2;
00069         break;
00070         case 10:
00071         //or.neq
00072         *s->tr |= *s->cr != *arg2;
00073         break;
00074         case 11:
00075         //set TR
00076         *s->tr = 1;
00077         break;
00078         case 12:
00079         //reset TR
00080         *s->tr = 0;
00081         break;
00082         case 13:
00083         //load CR
00084         *s->cr = *arg2;
00085         break;
00086         case 14:
00087         //8.bank PROBABLY NOT
00088         case 15:
00089         //unused
00090         default:
00091         return;
00092     }
00093     return;
00094 }
00095