1:
2: \ bernd thallner 9725890 e881
3: \ disassembler in forth for alpha
4:
5: \ format
6:
7: 0 constant cOpc
8: 1 constant cBra
9: 2 constant cF-P
10: 3 constant cMem
11: 4 constant cMfc
12: 5 constant cMbr
13: 6 constant cOpr
14: 7 constant cPcd
15:
16: \ util
17:
18: : right_shift ( a n -- a>>=n )
19: 0
20: ?do
21: 2/
22: loop
23: ;
24:
25: : left_shift ( a n -- a<<=n )
26: 0
27: ?do
28: 2*
29: loop
30: ;
31:
32: : h@ ( addr -- n ) \ 32 bit fetch
33: dup dup aligned = if
34: @
35: $00000000ffffffff and
36: else
37: 4 - @
38: $20 right_shift
39: endif
40: ;
41:
42: create string_table
43: 1000 allot
44:
45: \ makes an table entry with following data structure
46: \ 64 start address in string_table 48 strlen 32 format (cOpc, cBra, cF-P, cMem, cMfc, cMbr, cOpr, cPcd) 0
47:
48: : mktbentry, { start format straddr strlen -- start } \ make table entry
49: straddr string_table start + strlen cmove
50: start 48 left_shift
51: strlen 32 left_shift or
52: format or
53: ,
54: start strlen +
55: ;
56:
57: \ prints the string from stringtable
58: \ table_entry = 64 start address in string_table 48 strlen 32 unused 0
59:
60: : print_string ( table_entry -- ) \ print string entry
61: dup
62: 48 right_shift string_table +
63: swap
64: 32 right_shift $000000000000ffff and
65: type
66: ;
67:
68: \ Opr tab0 opcode 10.xxx
69: \ Opr tab1 opcode 11.xxx
70: \ Opr tab2 opcode 12.xxx
71: \ Opr tab3 opcode 13.xxx
72:
73: \ F-P tab0 opcode 15.xxx
74: \ F-P tab1 opcode 16.xxx
75: \ F-P tab2 opcode 17.xxx
76:
77: : tab0 2* 2* ;
78: : tab1 2* 2* 1 + ;
79: : tab2 2* 2* 2 + ;
80: : tab3 2* 2* 3 + ;
81:
82: 0 \ string_table offset
83:
84: create opcode_table
85:
86: ( 00 ) cPcd s" call_pal" mktbentry,
87: ( 01 ) cOpc s" opc01" mktbentry,
88: ( 02 ) cOpc s" opc02" mktbentry,
89: ( 03 ) cOpc s" opc03" mktbentry,
90: ( 04 ) cOpc s" opc04" mktbentry,
91: ( 05 ) cOpc s" opc05" mktbentry,
92: ( 06 ) cOpc s" opc06" mktbentry,
93: ( 07 ) cOpc s" opc07" mktbentry,
94: ( 08 ) cMem s" lda" mktbentry,
95: ( 09 ) cMem s" ldah" mktbentry,
96: ( 0a ) cOpc s" opc0a" mktbentry,
97: ( 0b ) cMem s" ldq_u" mktbentry,
98: ( 0c ) cOpc s" opc0c" mktbentry,
99: ( 0d ) cOpc s" opc0d" mktbentry,
100: ( 0e ) cOpc s" opc0e" mktbentry,
101: ( 0f ) cMem s" stq_u" mktbentry,
102: ( 10 ) cOpr s" " mktbentry,
103: ( 11 ) cOpr s" " mktbentry,
104: ( 12 ) cOpr s" " mktbentry,
105: ( 13 ) cOpr s" " mktbentry,
106: ( 14 ) cOpc s" opc14" mktbentry,
107: ( 15 ) cF-P s" " mktbentry,
108: ( 16 ) cF-P s" " mktbentry,
109: ( 17 ) cF-P s" " mktbentry,
110: ( 18 ) cMfc s" " mktbentry,
111: ( 19 ) cOpc s" pal19" mktbentry,
112: ( 1a ) cMbr s" " mktbentry,
113: ( 1b ) cOpc s" pal1b" mktbentry,
114: ( 1c ) cOpc s" opc1c" mktbentry,
115: ( 1d ) cOpc s" pal1d" mktbentry,
116: ( 1e ) cOpc s" pal1e" mktbentry,
117: ( 1f ) cOpc s" pal1f" mktbentry,
118: ( 20 ) cMem s" ldf" mktbentry,
119: ( 21 ) cMem s" ldg" mktbentry,
120: ( 22 ) cMem s" lds" mktbentry,
121: ( 23 ) cMem s" ldt" mktbentry,
122: ( 24 ) cMem s" stf" mktbentry,
123: ( 25 ) cMem s" stg" mktbentry,
124: ( 26 ) cMem s" sts" mktbentry,
125: ( 27 ) cMem s" stt" mktbentry,
126: ( 28 ) cMem s" ldl" mktbentry,
127: ( 29 ) cMem s" ldq" mktbentry,
128: ( 2a ) cMem s" ldl_l" mktbentry,
129: ( 2b ) cMem s" ldq_l" mktbentry,
130: ( 2c ) cMem s" stl" mktbentry,
131: ( 2d ) cMem s" stq" mktbentry,
132: ( 2e ) cMem s" stl_c" mktbentry,
133: ( 2f ) cMem s" stq_c" mktbentry,
134: ( 30 ) cBra s" br" mktbentry,
135: ( 31 ) cBra s" fbeq" mktbentry,
136: ( 32 ) cBra s" fblt" mktbentry,
137: ( 33 ) cBra s" fble" mktbentry,
138: ( 34 ) cBra s" bsr" mktbentry,
139: ( 35 ) cBra s" fbne" mktbentry,
140: ( 36 ) cBra s" fbge" mktbentry,
141: ( 37 ) cBra s" fbgt" mktbentry,
142: ( 38 ) cBra s" blbc" mktbentry,
143: ( 39 ) cBra s" beq" mktbentry,
144: ( 3a ) cBra s" blt" mktbentry,
145: ( 3b ) cBra s" ble" mktbentry,
146: ( 3c ) cBra s" blbs" mktbentry,
147: ( 3d ) cBra s" bne" mktbentry,
148: ( 3e ) cBra s" bge" mktbentry,
149: ( 3f ) cBra s" bgt" mktbentry,
150:
151: create Opr_list
152:
153: $00 tab0 s" addl" mktbentry,
154: $40 tab0 s" addlv" mktbentry,
155: $20 tab0 s" addq" mktbentry,
156: $60 tab0 s" addqv" mktbentry,
157: $0f tab0 s" cmpbge" mktbentry,
158: $2d tab0 s" cmpeq" mktbentry,
159: $6d tab0 s" cmple" mktbentry,
160: $4d tab0 s" cmplt" mktbentry,
161: $3d tab0 s" cmpule" mktbentry,
162: $1d tab0 s" cmpult" mktbentry,
163: $02 tab0 s" s4addl" mktbentry,
164: $22 tab0 s" s4addq" mktbentry,
165: $0b tab0 s" s4subl" mktbentry,
166: $2b tab0 s" s4subq" mktbentry,
167: $12 tab0 s" s8addl" mktbentry,
168: $32 tab0 s" s8addq" mktbentry,
169: $1b tab0 s" s8ubl" mktbentry,
170: $3b tab0 s" s8ubq" mktbentry,
171: $09 tab0 s" subl" mktbentry,
172: $49 tab0 s" sublv" mktbentry,
173: $29 tab0 s" subq" mktbentry,
174: $69 tab0 s" subqv" mktbentry,
175:
176: $00 tab1 s" and" mktbentry,
177: $08 tab1 s" bic" mktbentry,
178: $20 tab1 s" bis" mktbentry,
179: $24 tab1 s" cmoveq" mktbentry,
180: $46 tab1 s" cmovge" mktbentry,
181: $66 tab1 s" cmovgt" mktbentry,
182: $16 tab1 s" cmovlbc" mktbentry,
183: $14 tab1 s" cmovlbs" mktbentry,
184: $64 tab1 s" cmovle" mktbentry,
185: $44 tab1 s" cmovlt" mktbentry,
186: $26 tab1 s" cmovne" mktbentry,
187: $48 tab1 s" eqv" mktbentry,
188: $28 tab1 s" ornot" mktbentry,
189: $40 tab1 s" xor" mktbentry,
190:
191: $06 tab2 s" extbl" mktbentry,
192: $6a tab2 s" extlh" mktbentry,
193: $26 tab2 s" extll" mktbentry,
194: $7a tab2 s" extqh" mktbentry,
195: $36 tab2 s" extql" mktbentry,
196: $5a tab2 s" extwh" mktbentry,
197: $16 tab2 s" extwl" mktbentry,
198: $0b tab2 s" insbl" mktbentry,
199: $67 tab2 s" inslh" mktbentry,
200: $2b tab2 s" insll" mktbentry,
201: $77 tab2 s" insqh" mktbentry,
202: $3b tab2 s" insql" mktbentry,
203: $57 tab2 s" inswh" mktbentry,
204: $1b tab2 s" inswl" mktbentry,
205: $02 tab2 s" mskbl" mktbentry,
206: $62 tab2 s" msklh" mktbentry,
207: $22 tab2 s" mskll" mktbentry,
208: $72 tab2 s" mskqh" mktbentry,
209: $32 tab2 s" mskql" mktbentry,
210: $52 tab2 s" mskwh" mktbentry,
211: $12 tab2 s" mskwl" mktbentry,
212: $39 tab2 s" sll" mktbentry,
213: $3c tab2 s" sra" mktbentry,
214: $34 tab2 s" srl" mktbentry,
215: $30 tab2 s" zap" mktbentry,
216: $31 tab2 s" zapnot" mktbentry,
217:
218: $00 tab3 s" mull" mktbentry,
219: $20 tab3 s" mullq" mktbentry,
220: $30 tab3 s" umulh" mktbentry,
221: $40 tab3 s" mullv" mktbentry,
222: $60 tab3 s" mullqv" mktbentry,
223:
224: create Mfc_list
225:
226: $0000 s" trapb" mktbentry,
227: $0400 s" excb" mktbentry,
228: $4000 s" mb" mktbentry,
229: $4400 s" wmb" mktbentry,
230: $8000 s" fetch" mktbentry,
231: $a000 s" fetch_m" mktbentry,
232: $c000 s" rpcc" mktbentry,
233: $e000 s" rc" mktbentry,
234: $f000 s" rs" mktbentry,
235:
236: create Mbr_table
237:
238: ( 00 ) 0 s" jmp" mktbentry,
239: ( 01 ) 0 s" jsr" mktbentry,
240: ( 02 ) 0 s" ret" mktbentry,
241: ( 03 ) 0 s" jsr_coroutine" mktbentry,
242:
243: create F-P_list
244:
245: $080 tab0 s" addf" mktbentry,
246: $081 tab0 s" subf" mktbentry,
247: $082 tab0 s" mulf" mktbentry,
248: $083 tab0 s" divf" mktbentry,
249: $09e tab0 s" cvtdg" mktbentry,
250: $0a0 tab0 s" addg" mktbentry,
251: $0a1 tab0 s" subg" mktbentry,
252: $0a2 tab0 s" mulg" mktbentry,
253: $0a3 tab0 s" divg" mktbentry,
254: $0a5 tab0 s" cmpgeq" mktbentry,
255: $0a6 tab0 s" cmpglt" mktbentry,
256: $0a7 tab0 s" cmpgle" mktbentry,
257: $0ac tab0 s" cvtgf" mktbentry,
258: $0ad tab0 s" cvtgd" mktbentry,
259: $0af tab0 s" cvtgq" mktbentry,
260: $0bc tab0 s" cvtqf" mktbentry,
261: $0be tab0 s" cvtqg" mktbentry,
262:
263: $080 tab1 s" adds" mktbentry,
264: $081 tab1 s" subs" mktbentry,
265: $082 tab1 s" mulls" mktbentry,
266: $083 tab1 s" divs" mktbentry,
267: $0a0 tab1 s" addt" mktbentry,
268: $0a1 tab1 s" subt" mktbentry,
269: $0a2 tab1 s" mullt" mktbentry,
270: $0a3 tab1 s" divt" mktbentry,
271: $0a4 tab1 s" cmptun" mktbentry,
272: $0a5 tab1 s" cmpteq" mktbentry,
273: $0a6 tab1 s" cmptlt" mktbentry,
274: $0a7 tab1 s" cmptle" mktbentry,
275: $0ac tab1 s" cvtts" mktbentry,
276: $0af tab1 s" cvttq" mktbentry,
277: $0bc tab1 s" cvtqs" mktbentry,
278: $0be tab1 s" cvtqt" mktbentry,
279: $2ac tab1 s" cvtst" mktbentry,
280:
281: $010 tab2 s" cvtlq" mktbentry,
282: $020 tab2 s" cpys" mktbentry,
283: $021 tab2 s" cpysn" mktbentry,
284: $022 tab2 s" cpyse" mktbentry,
285: $024 tab2 s" mt_fpcr" mktbentry,
286: $025 tab2 s" mf_fpcr" mktbentry,
287: $02a tab2 s" fcmoveq" mktbentry,
288: $02b tab2 s" fcmovne" mktbentry,
289: $02c tab2 s" fcmovlt" mktbentry,
290: $02d tab2 s" fcmovge" mktbentry,
291: $02e tab2 s" fcmovle" mktbentry,
292: $02f tab2 s" fcmovgt" mktbentry,
293: $030 tab2 s" cvtql" mktbentry,
294: $130 tab2 s" cvtqlv" mktbentry,
295: $530 tab2 s" cvtqlsv" mktbentry,
296:
297: create register_table
298:
299: ( 00 ) 0 s" v0" mktbentry,
300: ( 01 ) 0 s" t0" mktbentry,
301: ( 02 ) 0 s" t1" mktbentry,
302: ( 03 ) 0 s" t2" mktbentry,
303: ( 04 ) 0 s" t3" mktbentry,
304: ( 05 ) 0 s" t4" mktbentry,
305: ( 06 ) 0 s" t5" mktbentry,
306: ( 07 ) 0 s" t6" mktbentry,
307: ( 08 ) 0 s" t7" mktbentry,
308: ( 09 ) 0 s" s0" mktbentry,
309: ( 0a ) 0 s" s1" mktbentry,
310: ( 0b ) 0 s" s2" mktbentry,
311: ( 0c ) 0 s" s3" mktbentry,
312: ( 0d ) 0 s" s4" mktbentry,
313: ( 0e ) 0 s" s5" mktbentry,
314: ( 0f ) 0 s" fp" mktbentry,
315: ( 10 ) 0 s" a0" mktbentry,
316: ( 11 ) 0 s" a1" mktbentry,
317: ( 12 ) 0 s" a2" mktbentry,
318: ( 13 ) 0 s" a3" mktbentry,
319: ( 14 ) 0 s" a4" mktbentry,
320: ( 15 ) 0 s" a5" mktbentry,
321: ( 16 ) 0 s" t8" mktbentry,
322: ( 17 ) 0 s" t9" mktbentry,
323: ( 18 ) 0 s" t10" mktbentry,
324: ( 19 ) 0 s" t11" mktbentry,
325: ( 1a ) 0 s" ra" mktbentry,
326: ( 1b ) 0 s" t12" mktbentry,
327: ( 1c ) 0 s" at" mktbentry,
328: ( 1d ) 0 s" gp" mktbentry,
329: ( 1e ) 0 s" sp" mktbentry,
330: ( 1f ) 0 s" zero" mktbentry,
331:
332: drop \ string_table end
333:
334: defer decode_register
335:
336: : decode_register_symb ( register -- )
337: cells register_table +
338: @ print_string $20 emit
339: ;
340:
341: : decode_register_number ( register -- )
342: .
343: ;
344:
345: ' decode_register_number is decode_register
346: \ ' decode_register_symb is decode_register
347:
348: : decode_Opc ( instruction tbentry -- )
349: print_string drop
350: ;
351:
352: : decode_Bra ( instruction tbentry -- )
353: swap
354: dup $03e00000 and 21 right_shift decode_register
355: $001fffff and .
356: print_string
357: ;
358:
359: : decode_F-P ( instruction tbentry -- )
360: drop
361: dup $03e00000 and 21 right_shift decode_register
362: dup $001f0000 and 16 right_shift decode_register
363: dup $0000001f and decode_register
364: dup 26 right_shift $15 -
365: swap $0000fff0 and 3 right_shift or F-P_list
366: begin
367: dup @ rot swap over over $00000000ffffffff and
368: = if print_string swap drop register_table swap else drop endif
369: swap 1 cells + dup register_table >
370: until
371: drop drop
372: ;
373:
374: : decode_Mem ( instruction tbentry -- )
375: swap
376: dup $03e00000 and 21 right_shift decode_register
377: dup $0000ffff and .
378: $001f0000 and 16 right_shift decode_register
379: print_string
380: ;
381:
382: : decode_Mfc ( instruction tbentry -- )
383: drop
384: dup $03e00000 and 21 right_shift decode_register
385: dup $001f0000 and 16 right_shift decode_register
386: $0000ffff and Mfc_list
387: begin
388: dup @ rot swap over over $00000000ffffffff and
389: = if print_string drop drop register_table 1 else drop endif
390: swap 1 cells + dup F-P_list >
391: until
392: drop drop
393: ;
394:
395: : decode_Mbr ( instruction tbentry -- )
396: drop
397: dup $03e00000 and 21 right_shift decode_register
398: dup $001f0000 and 16 right_shift decode_register
399: dup $00003fff and decode_register
400: $0000c000 and 14 right_shift cells Mbr_table +
401: @ print_string
402: ;
403:
404: : decode_Opr ( instruction tbentry -- )
405: drop
406: dup $03e00000 and 21 right_shift decode_register
407: dup dup $00001000 and $00001000
408: = if
409: $001fe000 and 13 right_shift . -1
410: else
411: $001f0000 and 16 right_shift decode_register 0
412: endif
413: swap dup $0000001f and decode_register
414: dup 26 right_shift $10 -
415: swap $00000fe0 and 3 right_shift or Opr_list
416: begin
417: dup @ rot swap over over $00000000ffffffff and
418: = if print_string swap drop register_table swap else drop endif
419: swap 1 cells + dup Mfc_list >
420: until
421: drop drop if $23 emit endif
422: ;
423:
424: : decode_Pcd ( instruction tbentry -- )
425: swap
426: $0000000003ffffff and .
427: print_string
428: ;
429:
430: : decode_inst ( n -- ) \ instruction decoder
431: dup $fc000000 and
432: 26 right_shift cells
433: opcode_table +
434: @ dup
435: $000000000000ffff and
436: dup cOpc = if drop decode_Opc
437: else dup cF-P = if drop decode_F-P
438: else dup cOpr = if drop decode_Opr
439: else dup cMfc = if drop decode_Mfc
440: else dup cMbr = if drop decode_Mbr
441: else dup cMem = if drop decode_Mem
442: else dup cBra = if drop decode_Bra
443: else dup cPcd = if drop decode_Pcd
444: endif
445: endif
446: endif
447: endif
448: endif
449: endif
450: endif
451: endif
452: $2c emit $a emit
453: ;
454:
455: : disasm ( addr n -- ) \ disassembler
456: $a emit 0
457: ?do
458: dup h@
459: over $28 emit $20 emit . $29 emit $20 emit
460: decode_inst
461: 4 +
462: loop
463: drop $a emit
464: ;
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