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Line No.	Rev	Author	Line
1	15	rhoads	`##################################################################`
2			`# TITLE: Opcode Tester`
3			`# AUTHOR: Steve Rhoads (rhoadss@yahoo.com)`
4			`# DATE CREATED: 1/10/02`
5			`# FILENAME: opcodes.asm`
6			`# PROJECT: MIPS CPU core`
7			`# COPYRIGHT: Software placed into the public domain by the author.`
8			`# Software 'as is' without warranty. Author liable for nothing.`
9			`# DESCRIPTION:`
10			`# This assembly file tests all of the opcodes supported by the`
11			`# MIPS-lite core.`
12			`# This test assumes that address 0xffff is the UART write register`
13			`# Successful tests will print out "A" or "AB" or "ABC" or ....`
14			`# Missing letters or letters out of order indicate a failure.`
15			`##################################################################`
16			`.text`
17			`.align 2`
18			`.globl entry`
19			`.ent entry`
20			`entry:`
21			`.set noreorder`
22
23			`# ori $20,$0,0xffff #serial port write address`
24			`# li $2,-66*19`
25			`# ori $3,$0,19`
26			`# div $2,$3`
27			`# nop`
28			`# mflo $4`
29			`# sub $4,$0,$4`
30			`# sb $4,0($20)`
31
32
33			`ori $20,$0,0xffff #serial port write address`
34			`ori $21,$0,'\n' # letter`
35			`ori $22,$0,'X' #'X' letter`
36
37			`######################################`
38			`#Arithmetic Instructions`
39			`######################################`
40			`ori $2,$0,'A'`
41			`sb $2,0($20)`
42			`ori $2,$0,'r'`
43			`sb $2,0($20)`
44			`ori $2,$0,'i'`
45			`sb $2,0($20)`
46			`ori $2,$0,'t'`
47			`sb $2,0($20)`
48			`ori $2,$0,'h'`
49			`sb $2,0($20)`
50			`sb $21,0($20)`
51
52			`#ADD`
53			`ori $3,$0,5`
54			`ori $4,$0,60`
55			`add $2,$3,$4`
56			`sb $2,0($20)`
57			`sb $21,0($20)`
58
59			`#ADDI`
60			`ori $4,$0,60`
61			`addi $2,$4,5`
62			`sb $2,0($20)`
63			`sb $21,0($20)`
64
65			`#ADDIU`
66			`ori $4,$0,50`
67			`addiu $5,$4,15`
68			`sb $5,0($20)`
69			`sb $21,0($20)`
70
71			`#ADDU`
72			`ori $3,$0,5`
73			`ori $4,$0,60`
74			`add $2,$3,$4`
75			`sb $2,0($20)`
76			`sb $21,0($20)`
77
78			`#DIV`
79			`ori $2,$0,65*13`
80			`ori $3,$0,13`
81			`div $2,$3`
82			`nop`
83			`mflo $4`
84			`sb $4,0($20)`
85			`li $2,-66*19`
86			`ori $3,$0,19`
87			`div $2,$3`
88			`nop`
89			`mflo $4`
90			`sub $4,$0,$4`
91			`sb $4,0($20)`
92			`ori $2,$0,67*23`
93			`li $3,-23`
94			`div $2,$3`
95			`nop`
96			`mflo $4`
97			`sub $4,$0,$4`
98			`sb $4,0($20)`
99			`li $2,-68*13`
100			`li $3,-13`
101			`div $2,$3`
102			`mflo $4`
103			`sb $4,0($20)`
104			`sb $21,0($20)`
105
106			`#DIVU`
107			`ori $2,$0,65*13`
108			`ori $3,$0,13`
109			`div $2,$3`
110			`nop`
111			`mflo $4`
112			`sb $4,0($20)`
113			`sb $21,0($20)`
114
115			`#MULT`
116			`ori $2,$0,5`
117			`ori $3,$0,13`
118			`mult $2,$3`
119			`nop`
120			`mflo $4`
121			`sb $4,0($20)`
122			`li $2,-5`
123			`ori $3,$0,13`
124			`mult $2,$3`
125			`nop`
126			`mflo $4`
127			`sub $4,$0,$4`
128			`addi $4,$4,1`
129			`sb $4,0($20)`
130			`ori $2,$0,5`
131			`li $3,-13`
132			`mult $2,$3`
133			`nop`
134			`mflo $4`
135			`sub $4,$0,$4`
136			`addi $4,$4,2`
137			`sb $4,0($20)`
138			`li $2,-5`
139			`li $3,-13`
140			`mult $2,$3`
141			`nop`
142			`mflo $4`
143			`addi $4,$4,3`
144			`sb $4,0($20)`
145			`sb $21,0($20)`
146
147			`#MULTU`
148			`ori $2,$0,5`
149			`ori $3,$0,13`
150			`mult $2,$3`
151			`nop`
152			`mflo $4`
153			`sb $4,0($20)`
154			`sb $21,0($20)`
155
156			`#SLT`
157			`ori $2,$0,10`
158			`ori $3,$0,12`
159			`slt $4,$2,$3`
160			`addi $5,$4,64`
161			`sb $5,0($20)`
162			`slt $4,$3,$2`
163			`addi $5,$4,66`
164			`sb $5,0($20)`
165			`li $2,0xfffffff0`
166			`slt $4,$2,$3`
167			`addi $5,$4,66`
168			`sb $5,0($20)`
169			`slt $4,$3,$2`
170			`addi $5,$4,68`
171			`sb $5,0($20)`
172			`li $3,0xffffffff`
173			`slt $4,$2,$3`
174			`addi $5,$4,68`
175			`sb $5,0($20)`
176			`slt $4,$3,$2`
177			`addi $5,$4,70`
178			`sb $5,0($20)`
179			`sb $21,0($20)`
180
181			`#SLTI`
182			`ori $2,$0,10`
183			`slti $4,$2,12`
184			`addi $5,$4,64`
185			`sb $5,0($20)`
186			`slti $4,$2,8`
187			`addi $5,$4,66`
188			`sb $5,0($20)`
189			`sb $21,0($20)`
190
191			`#SLTIU`
192			`ori $2,$0,10`
193			`sltiu $4,$2,12`
194			`addi $5,$4,64`
195			`sb $5,0($20)`
196			`sltiu $4,$2,8`
197			`addi $5,$4,66`
198			`sb $5,0($20)`
199			`sb $21,0($20)`
200
201			`#SLTU`
202			`ori $2,$0,10`
203			`ori $3,$0,12`
204			`slt $4,$2,$3`
205			`addi $5,$4,64`
206			`sb $5,0($20)`
207			`slt $4,$3,$2`
208			`addi $5,$4,66`
209			`sb $5,0($20)`
210			`sb $21,0($20)`
211
212			`#SUB`
213			`ori $3,$0,70`
214			`ori $4,$0,5`
215			`sub $2,$3,$4`
216			`sb $2,0($20)`
217			`sb $21,0($20)`
218
219			`#SUBU`
220			`ori $3,$0,70`
221			`ori $4,$0,5`
222			`sub $2,$3,$4`
223			`sb $2,0($20)`
224			`sb $21,0($20)`
225
226			`######################################`
227			`#Branch and Jump Instructions`
228			`######################################`
229			`ori $2,$0,'B'`
230			`sb $2,0($20)`
231			`ori $2,$0,'r'`
232			`sb $2,0($20)`
233			`ori $2,$0,'a'`
234			`sb $2,0($20)`
235			`ori $2,$0,'n'`
236			`sb $2,0($20)`
237			`ori $2,$0,'c'`
238			`sb $2,0($20)`
239			`ori $2,$0,'h'`
240			`sb $2,0($20)`
241			`sb $21,0($20)`
242
243			`#B`
244			`ori $10,$0,'A'`
245			`ori $11,$0,'B'`
246			`b $B1`
247			`sb $10,0($20)`
248			`sb $22,0($20)`
249			`$B1:`
250			`sb $11,0($20)`
251			`sb $21,0($20)`
252
253			`#BAL`
254			`ori $10,$0,'A'`
255			`ori $11,$0,'B'`
256			`ori $12,$0,'C'`
257			`ori $13,$0,'D'`
258			`ori $14,$0,'E'`
259			`ori $15,$0,'X'`
260			`bal $BAL1`
261			`sb $10,0($20)`
262			`sb $13,0($20)`
263			`b $BAL2`
264			`sb $14,0($20)`
265			`sb $15,0($20)`
266			`$BAL1:`
267			`sb $11,0($20)`
268			`jr $31`
269			`sb $12,0($20)`
270			`sb $22,0($20)`
271			`$BAL2:`
272			`sb $21,0($20)`
273
274			`#BEQ`
275			`ori $10,$0,'A'`
276			`ori $11,$0,'B'`
277			`ori $12,$0,'C'`
278			`ori $13,$0,'D'`
279			`ori $2,$0,100`
280			`ori $3,$0,123`
281			`ori $4,$0,123`
282			`beq $2,$3,$BEQ1`
283			`sb $10,0($20)`
284			`sb $11,0($20)`
285			`beq $3,$4,$BEQ1`
286			`sb $12,0($20)`
287			`sb $22,0($20)`
288			`$BEQ1:`
289			`sb $13,0($20)`
290			`sb $21,0($20)`
291
292			`#BGEZ`
293			`ori $10,$0,'A'`
294			`ori $11,$0,'B'`
295			`ori $12,$0,'C'`
296			`ori $13,$0,'D'`
297			`or $15,$0,'X'`
298			`ori $2,$0,100`
299			`li $3,0xffff1234`
300			`ori $4,$0,123`
301			`bgez $3,$BGEZ1`
302			`sb $10,0($20)`
303			`sb $11,0($20)`
304			`bgez $2,$BGEZ1`
305			`sb $12,0($20)`
306			`sb $22,0($20)`
307			`$BGEZ1:`
308			`bgez $0,$BGEZ2`
309			`nop`
310			`sb $15,0($20)`
311			`$BGEZ2:`
312			`sb $13,0($20)`
313			`sb $21,0($20)`
314
315			`#BGEZAL`
316			`ori $10,$0,'A'`
317			`ori $11,$0,'B'`
318			`ori $12,$0,'C'`
319			`ori $13,$0,'D'`
320			`ori $14,$0,'E'`
321			`ori $15,$0,'X'`
322			`li $3,0xffff1234`
323			`bgezal $3,$BGEZAL1`
324			`nop`
325			`sb $10,0($20)`
326			`bgezal $0,$BGEZAL1`
327			`nop`
328			`sb $13,0($20)`
329			`b $BGEZAL2`
330			`sb $14,0($20)`
331			`sb $15,0($20)`
332			`$BGEZAL1:`
333			`sb $11,0($20)`
334			`jr $31`
335			`sb $12,0($20)`
336			`sb $22,0($20)`
337			`$BGEZAL2:`
338			`sb $21,0($20)`
339
340			`#BGTZ`
341			`ori $10,$0,'A'`
342			`ori $11,$0,'B'`
343			`ori $12,$0,'C'`
344			`ori $13,$0,'D'`
345			`ori $2,$0,100`
346			`li $3,0xffff1234`
347			`bgtz $3,$BGTZ1`
348			`sb $10,0($20)`
349			`sb $11,0($20)`
350			`bgtz $2,$BGTZ1`
351			`sb $12,0($20)`
352			`sb $22,0($20)`
353			`$BGTZ1:`
354			`sb $13,0($20)`
355			`sb $21,0($20)`
356
357			`#BLEZ`
358			`ori $10,$0,'A'`
359			`ori $11,$0,'B'`
360			`ori $12,$0,'C'`
361			`ori $13,$0,'D'`
362			`ori $2,$0,100`
363			`li $3,0xffff1234`
364			`blez $2,$BLEZ1`
365			`sb $10,0($20)`
366			`sb $11,0($20)`
367			`blez $3,$BLEZ1`
368			`sb $12,0($20)`
369			`sb $22,0($20)`
370			`$BLEZ1:`
371			`blez $0,$BLEZ2`
372			`nop`
373			`sb $22,0($20)`
374			`$BLEZ2:`
375			`sb $13,0($20)`
376			`sb $21,0($20)`
377
378			`#BLTZ`
379			`ori $10,$0,'A'`
380			`ori $11,$0,'B'`
381			`ori $12,$0,'C'`
382			`ori $13,$0,'D'`
383			`ori $14,$0,'E'`
384			`ori $2,$0,100`
385			`li $3,0xffff1234`
386			`ori $4,$0,0`
387			`bltz $2,$BLTZ1`
388			`sb $10,0($20)`
389			`sb $11,0($20)`
390			`bltz $3,$BLTZ1`
391			`sb $12,0($20)`
392			`sb $22,0($20)`
393			`$BLTZ1:`
394			`bltz $4,$BLTZ2`
395			`nop`
396			`sb $13,0($20)`
397			`$BLTZ2:`
398			`sb $14,0($20)`
399			`sb $21,0($20)`
400
401			`#BLTZAL`
402			`ori $10,$0,'A'`
403			`ori $11,$0,'B'`
404			`ori $12,$0,'C'`
405			`ori $13,$0,'D'`
406			`ori $14,$0,'E'`
407			`ori $15,$0,'X'`
408			`li $3,0xffff1234`
409			`bltzal $0,$BLTZAL1`
410			`nop`
411			`sb $10,0($20)`
412			`bltzal $3,$BLTZAL1`
413			`nop`
414			`sb $13,0($20)`
415			`b $BLTZAL2`
416			`sb $14,0($20)`
417			`sb $15,0($20)`
418			`$BLTZAL1:`
419			`sb $11,0($20)`
420			`jr $31`
421			`sb $12,0($20)`
422			`sb $22,0($20)`
423			`$BLTZAL2:`
424			`sb $21,0($20)`
425
426			`#BNE`
427			`ori $10,$0,'A'`
428			`ori $11,$0,'B'`
429			`ori $12,$0,'C'`
430			`ori $13,$0,'D'`
431			`ori $2,$0,100`
432			`ori $3,$0,123`
433			`ori $4,$0,123`
434			`bne $3,$4,$BNE1`
435			`sb $10,0($20)`
436			`sb $11,0($20)`
437			`bne $2,$3,$BNE1`
438			`sb $12,0($20)`
439			`sb $22,0($20)`
440			`$BNE1:`
441			`sb $13,0($20)`
442			`sb $21,0($20)`
443
444			`#J`
445			`ori $10,$0,'A'`
446			`ori $11,$0,'B'`
447			`ori $15,$0,'X'`
448			`j $J1`
449			`sb $10,0($20)`
450			`sb $15,0($20)`
451			`$J1:`
452			`sb $11,0($20)`
453			`sb $21,0($20)`
454
455			`#JAL`
456			`ori $10,$0,'A'`
457			`ori $11,$0,'B'`
458			`ori $12,$0,'C'`
459			`ori $13,$0,'D'`
460			`ori $14,$0,'E'`
461			`ori $15,$0,'X'`
462			`jal $JAL1`
463			`sb $10,0($20)`
464			`sb $13,0($20)`
465			`b $JAL2`
466			`sb $14,0($20)`
467			`sb $15,0($20)`
468			`$JAL1:`
469			`sb $11,0($20)`
470			`jr $31`
471			`sb $12,0($20)`
472			`sb $22,0($20)`
473			`$JAL2:`
474			`sb $21,0($20)`
475
476			`#JALR`
477			`ori $10,$0,'A'`
478			`ori $11,$0,'B'`
479			`ori $12,$0,'C'`
480			`ori $13,$0,'D'`
481			`ori $14,$0,'E'`
482			`ori $15,$0,'X'`
483			`la $3,$JALR1`
484			`jalr $3`
485			`sb $10,0($20)`
486			`sb $13,0($20)`
487			`b $JALR2`
488			`sb $14,0($20)`
489			`sb $15,0($20)`
490			`$JALR1:`
491			`sb $11,0($20)`
492			`jr $31`
493			`sb $12,0($20)`
494			`sb $22,0($20)`
495			`$JALR2:`
496			`sb $21,0($20)`
497
498			`#JR`
499			`ori $10,$0,'A'`
500			`ori $11,$0,'B'`
501			`ori $15,$0,'X'`
502			`la $3,$JR1`
503			`jr $3`
504			`sb $10,0($20)`
505			`sb $15,0($20)`
506			`$JR1:`
507			`sb $11,0($20)`
508			`sb $21,0($20)`
509
510			`#NOP`
511			`ori $2,$0,65`
512			`nop`
513			`sb $2,0($20)`
514			`sb $21,0($20)`
515
516
517			`######################################`
518			`#Load, Store, and Memory Control Instructions`
519			`######################################`
520			`ori $2,$0,'L'`
521			`sb $2,0($20)`
522			`ori $2,$0,'o'`
523			`sb $2,0($20)`
524			`ori $2,$0,'a'`
525			`sb $2,0($20)`
526			`ori $2,$0,'d'`
527			`sb $2,0($20)`
528			`sb $21,0($20)`
529
530			`#LB`
531			`ori $2,$0,0xf000`
532			`li $3,0x41424344`
533			`sw $3,16($2)`
534			`lb $4,16($2)`
535			`sb $4,0($20)`
536			`lb $4,17($2)`
537			`sb $4,0($20)`
538			`lb $4,18($2)`
539			`sb $4,0($20)`
540			`lb $2,19($2)`
541			`sb $2,0($20)`
542			`sb $21,0($20)`
543
544			`#LBU`
545			`ori $2,$0,0xf000`
546			`li $3,0x41424344`
547			`sw $3,16($2)`
548			`lb $4,16($2)`
549			`sb $4,0($20)`
550			`lb $4,17($2)`
551			`sb $4,0($20)`
552			`lb $4,18($2)`
553			`sb $4,0($20)`
554			`lb $2,19($2)`
555			`sb $2,0($20)`
556			`sb $21,0($20)`
557
558			`#LH`
559			`ori $2,$0,0xf000`
560			`li $3,0x00410042`
561			`sw $3,16($2)`
562			`lh $4,16($2)`
563			`sb $4,0($20)`
564			`lh $2,18($2)`
565			`sb $2,0($20)`
566			`sb $21,0($20)`
567
568			`#LHU`
569			`ori $2,$0,0xf000`
570			`li $3,0x00410042`
571			`sw $3,16($2)`
572			`lh $4,16($2)`
573			`sb $4,0($20)`
574			`lh $2,18($2)`
575			`sb $2,0($20)`
576			`sb $21,0($20)`
577
578			`#LW`
579			`ori $2,$0,0xf000`
580			`li $3,'A'`
581			`sw $3,16($2)`
582			`ori $3,$0,0`
583			`lw $2,16($2)`
584			`sb $2,0($20)`
585			`sb $21,0($20)`
586
587			`#LWL & LWR`
588			`ori $2,$0,0xf000`
589			`li $3,'A'`
590			`sw $3,16($2)`
591			`ori $3,$0,0`
592			`lwl $2,16($2)`
593			`lwr $2,16($2)`
594			`sb $2,0($20)`
595			`sb $21,0($20)`
596
597			`#SB`
598			`ori $2,$0,'A'`
599			`sb $2,0($20)`
600			`sb $21,0($20)`
601
602			`#SH`
603			`ori $2,$0,0xf000`
604			`ori $2,$0,0x4142`
605			`sw $2,16($2)`
606			`lb $3,16($2)`
607			`sb $3,0($20)`
608			`lb $2,17($2)`
609			`sb $2,0($20)`
610			`sb $21,0($20)`
611
612			`#SW`
613			`ori $2,$0,0xf000`
614			`li $3,0x41424344`
615			`sw $3,16($2)`
616			`lb $4,16($2)`
617			`sb $4,0($20)`
618			`lb $4,17($2)`
619			`sb $4,0($20)`
620			`lb $4,18($2)`
621			`sb $4,0($20)`
622			`lb $2,19($2)`
623			`sb $2,0($20)`
624			`sb $21,0($20)`
625
626			`#SWL & SWR`
627			`ori $2,$0,0xf000`
628			`li $3,0x41424344`
629			`swl $3,16($2)`
630			`swr $3,16($2)`
631			`lb $4,16($2)`
632			`sb $4,0($20)`
633			`lb $4,17($2)`
634			`sb $4,0($20)`
635			`lb $4,18($2)`
636			`sb $4,0($20)`
637			`lb $2,19($2)`
638			`sb $2,0($20)`
639			`sb $21,0($20)`
640
641
642			`######################################`
643			`#Logical Instructions`
644			`######################################`
645			`ori $2,$0,'L'`
646			`sb $2,0($20)`
647			`ori $2,$0,'o'`
648			`sb $2,0($20)`
649			`ori $2,$0,'g'`
650			`sb $2,0($20)`
651			`ori $2,$0,'i'`
652			`sb $2,0($20)`
653			`ori $2,$0,'c'`
654			`sb $2,0($20)`
655			`sb $21,0($20)`
656
657			`#AND`
658			`ori $2,$0,0x0741`
659			`ori $3,$0,0x60f3`
660			`and $4,$2,$3`
661			`sb $4,0($20)`
662			`sb $21,0($20)`
663
664			`#ANDI`
665			`ori $2,$0,0x0741`
666			`andi $4,$2,0x60f3`
667			`sb $4,0($20)`
668			`sb $21,0($20)`
669
670			`#LUI`
671			`lui $2,0x41`
672			`srl $3,$2,16`
673			`sb $3,0($20)`
674			`sb $21,0($20)`
675
676			`#NOR`
677			`li $2,0xf0fff08e`
678			`li $3,0x0f0f0f30`
679			`nor $4,$2,$3`
680			`sb $4,0($20)`
681			`sb $21,0($20)`
682
683			`#OR`
684			`ori $2,$0,0x40`
685			`ori $3,$0,0x01`
686			`or $4,$2,$3`
687			`sb $4,0($20)`
688			`sb $21,0($20)`
689
690			`#ORI`
691			`ori $2,$0,0x40`
692			`ori $4,$2,0x01`
693			`sb $4,0($20)`
694			`sb $21,0($20)`
695
696			`#XOR`
697			`ori $2,$0,0xf043`
698			`ori $3,$0,0xf002`
699			`xor $4,$2,$3`
700			`sb $4,0($20)`
701			`sb $21,0($20)`
702
703			`#XORI`
704			`ori $2,$0,0xf043`
705			`xor $4,$2,0xf002`
706			`sb $4,0($20)`
707			`sb $21,0($20)`
708
709
710			`######################################`
711			`#Move Instructions`
712			`######################################`
713			`ori $2,$0,'M'`
714			`sb $2,0($20)`
715			`ori $2,$0,'o'`
716			`sb $2,0($20)`
717			`ori $2,$0,'v'`
718			`sb $2,0($20)`
719			`ori $2,$0,'e'`
720			`sb $2,0($20)`
721			`sb $21,0($20)`
722
723			`#MFHI`
724			`ori $2,$0,65`
725			`mthi $2`
726			`mfhi $3`
727			`sb $3,0($20)`
728			`sb $21,0($20)`
729
730			`#MFLO`
731			`ori $2,$0,65`
732			`mtlo $2`
733			`mflo $3`
734			`sb $3,0($20)`
735			`sb $21,0($20)`
736
737			`#MTHI`
738			`ori $2,$0,65`
739			`mthi $2`
740			`mfhi $3`
741			`sb $3,0($20)`
742			`sb $21,0($20)`
743
744			`#MTLO`
745			`ori $2,$0,65`
746			`mtlo $2`
747			`mflo $3`
748			`sb $3,0($20)`
749			`sb $21,0($20)`
750
751
752			`######################################`
753			`#Shift Instructions`
754			`######################################`
755			`ori $2,$0,'S'`
756			`sb $2,0($20)`
757			`ori $2,$0,'h'`
758			`sb $2,0($20)`
759			`ori $2,$0,'i'`
760			`sb $2,0($20)`
761			`ori $2,$0,'f'`
762			`sb $2,0($20)`
763			`ori $2,$0,'t'`
764			`sb $2,0($20)`
765			`sb $21,0($20)`
766
767			`#SLL`
768			`li $2,0x40414243`
769			`sll $3,$2,8`
770			`srl $3,$3,24`
771			`sb $3,0($20)`
772			`sb $21,0($20)`
773
774			`#SLLV`
775			`li $2,0x40414243`
776			`ori $3,$0,8`
777			`sllv $3,$2,$3`
778			`srl $3,$3,24`
779			`sb $3,0($20)`
780			`sb $21,0($20)`
781
782			`#SRA`
783			`li $2,0x40414243`
784			`sra $3,$2,16`
785			`sb $3,0($20)`
786			`li $2,0x84000000`
787			`sra $3,$2,25`
788			`sub $3,$3,0x80`
789			`sb $3,0($20)`
790			`sb $21,0($20)`
791
792			`#SRAV`
793			`li $2,0x40414243`
794			`ori $3,$0,16`
795			`srav $3,$2,$3`
796			`sb $3,0($20)`
797			`ori $3,$0,25`
798			`li $2,0x84000000`
799			`sra $3,$2,$3`
800			`sub $3,$3,0x80`
801			`sb $3,0($20)`
802			`sb $21,0($20)`
803
804			`#SRL`
805			`li $2,0x40414243`
806			`srl $3,$2,16`
807			`sb $3,0($20)`
808			`li $2,0x84000000`
809			`sra $3,$2,25`
810			`sb $3,0($20)`
811			`sb $21,0($20)`
812
813			`#SRLV`
814			`li $2,0x40414243`
815			`ori $3,$0,16`
816			`srlv $4,$2,$3`
817			`sb $4,0($20)`
818			`ori $3,$0,25`
819			`li $2,0x84000000`
820			`sra $3,$2,$3`
821			`sub $3,$3,0x80`
822			`sb $3,0($20)`
823			`sb $21,0($20)`
824
825
826			`ori $2,$0,'D'`
827			`sb $2,0($20)`
828			`ori $2,$0,'o'`
829			`sb $2,0($20)`
830			`ori $2,$0,'n'`
831			`sb $2,0($20)`
832			`ori $2,$0,'e'`
833			`sb $2,0($20)`
834			`sb $21,0($20)`
835
836
837			`$DONE:`
838			`j $DONE`
839			`nop`
840
841			`.set reorder`
842			`.end entry`
843

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