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instr.h

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00001 /*
00002  Copyright (c) 1992-1993 The Regents of the University of California.
00003  All rights reserved.  See copyright.h for copyright notice and limitation 
00004  of liability and disclaimer of warranty provisions.
00005  */
00006 
00007 #include "copyright.h"
00008 
00009 /* Instruction formats */
00010 
00011 #define rd(i)           (((i) >> 11) & 0x1f)
00012 #define rt(i)           (((i) >> 16) & 0x1f)
00013 #define rs(i)           (((i) >> 21) & 0x1f)
00014 #define shamt(i)        (((i) >> 6) & 0x1f)
00015 #define immed(i)        (((i) & 0x8000) ? (i)|(-0x8000) : (i)&0x7fff)
00016 
00017 #define off26(i)        (((i)&((1<<26)-1))<<2)
00018 #define top4(i)         (((i)&(~((1<<28)-1))))
00019 #define off16(i)        (immed(i)<<2)
00020 
00021 #define extend(i, hibitmask)    (((i)&(hibitmask)) ? ((i)|(-(hibitmask))) : (i))
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