1: \ disasm.fs disassembler file (for MIPS32)
2: \
3: \ Copyright (C) 2000,2007,2010 Free Software Foundation, Inc.
4:
5: \ This file is part of Gforth.
6:
7: \ Gforth is free software; you can redistribute it and/or
8: \ modify it under the terms of the GNU General Public License
9: \ as published by the Free Software Foundation, either version 3
10: \ of the License, or (at your option) any later version.
11:
12: \ This program is distributed in the hope that it will be useful,
13: \ but WITHOUT ANY WARRANTY; without even the implied warranty of
14: \ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15: \ GNU General Public License for more details.
16:
17: \ You should have received a copy of the GNU General Public License
18: \ along with this program. If not, see http://www.gnu.org/licenses/.
19:
20: \ this disassembler is based on data from the R4400 manual
21: \ http://www.mips.com/Documentation/R4400_Uman_book_Ed2.pdf, in
22: \ particular pages A3, A181, A182 (p. 471, 649, 650 in xpdf).
23: \ it is limited to the R3000 (MIPS-I) architecture, though.
24:
25: \ test this with
26: \ gforth arch/mips/disasm.fs -e "here" arch/mips/testdisasm.fs -e "here over - disasm bye" |sed 's/([^)]*) //'|diff -u - arch/mips/testasm.fs
27:
28: get-current
29: vocabulary disassembler
30: also disassembler definitions
31:
32: \ instruction fields
33:
34: : disasm-op ( w -- u )
35: 26 rshift ;
36:
37: : disasm-rs ( w -- u )
38: 21 rshift $1F and ;
39:
40: : disasm-rt ( w -- u )
41: 16 rshift $1f and ;
42:
43: : disasm-rd ( w -- u )
44: 11 rshift $1f and ;
45:
46: : disasm-shamt ( w -- u )
47: \ shift amount field
48: 6 rshift $1f and ;
49:
50: : disasm-funct ( w -- u )
51: $3f and ;
52:
53: : disasm-copz ( w -- u )
54: disasm-op 3 and ;
55:
56: : disasm-uimm ( w -- u )
57: $ffff and ;
58:
59: : disasm-imm ( w -- n )
60: disasm-uimm dup 15 rshift negate 15 lshift or ;
61:
62: : disasm-relative ( addr n -- w )
63: \ compute printable form of relative address n relative to addr
64: 2 lshift nip ( + ) ;
65:
66: \ decode tables
67:
68: : disasm-illegal ( addr w -- )
69: \ disassemble illegal/unknown instruction w at addr
70: hex. ." , ( illegal inst ) " drop ;
71:
72: : disasm-table ( n "name" -- )
73: \ initialize table with n entries with disasm-illegal
74: create 0 ?do
75: ['] disasm-illegal ,
76: loop
77: does> ( u -- addr )
78: swap cells + ;
79:
80: $40 disasm-table opc-tab-entry \ top-level decode table
81: $40 disasm-table funct-tab-entry \ special function table
82: $40 disasm-table funct-tab2-entry \ special2 function table
83: $20 disasm-table regimm-tab-entry \ regim instructions rt table
84: $20 disasm-table copz-rs-tab-entry \ COPz instructions rs table
85: $20 disasm-table copz-rt-tab-entry \ COPz BC instructions rt table
86: $40 disasm-table cp0-tab-entry \ COP0 CO instructions funct table
87:
88: \ disassembler central decode cascade
89:
90: dup set-current
91:
92: : disasm-inst ( addr w -- )
93: \G disassemble instruction w at addr (addr is used for computing
94: \G branch targets)
95: dup disasm-op opc-tab-entry @ execute ;
96:
97: : disasm ( addr u -- ) \ gforth
98: \G disassemble u aus starting at addr
99: bounds u+do
100: cr ." ( " i hex. ." ) " i i ul@ disasm-inst
101: 4 +loop
102: cr ;
103:
104: ' disasm IS discode
105:
106: definitions
107:
108: : disasm-special ( addr w -- )
109: \ disassemble inst with opcode special
110: dup disasm-funct funct-tab-entry @ execute ;
111: ' disasm-special 0 opc-tab-entry ! \ enter it for opcode special
112:
113: : disasm-special2 ( addr w -- ) \ todo factor out!
114: \ disassemble inst with opcode special2
115: dup disasm-funct funct-tab2-entry @ execute ;
116: ' disasm-special2 $1C opc-tab-entry ! \ enter it for opcode special
117:
118: : disasm-regimm ( addr w -- )
119: \ disassemble regimm inst
120: dup disasm-rt regimm-tab-entry @ execute ;
121: ' disasm-regimm 1 opc-tab-entry ! \ enter it for opcode regimm
122:
123: : disasm-copz-rs ( addr w -- )
124: \ disassemble inst with opcode COPz
125: dup disasm-rs copz-rs-tab-entry @ execute ;
126: ' disasm-copz-rs $10 opc-tab-entry ! \ enter it for opcodes COPz
127: ' disasm-copz-rs $11 opc-tab-entry !
128: ' disasm-copz-rs $12 opc-tab-entry !
129:
130: : disasm-copz-rt ( addr w -- )
131: \ disassemble inst with opcode COPz, rs=BC
132: dup disasm-rt copz-rt-tab-entry @ execute ;
133: ' disasm-copz-rt $08 copz-rs-tab-entry ! \ into COPz-table for rs=BC
134:
135: : disasm-cp0 ( addr w -- )
136: \ disassemble inst with opcode COPz, rs=CO
137: dup disasm-funct cp0-tab-entry @ execute ;
138: ' disasm-cp0 $10 copz-rs-tab-entry ! \ into COPz-table for rs=CO
139:
140: \ dummy words for insts.fs (words with these names are needed by asm.fs)
141:
142: : asm-op ( -- ) ;
143: : asm-rs ( -- ) ;
144: : asm-rt ( -- ) ;
145:
146: \ disassemble various formats
147:
148: : disasm-J-target ( addr w -- )
149: \ print jump target
150: 2 lshift $0fffffff and swap $f0000000 and or hex. ;
151:
152: : disasm-I-rs,rt,imm ( addr w -- )
153: dup disasm-rs .
154: dup disasm-rt .
155: disasm-imm disasm-relative . ;
156:
157: : disasm-I-rs,imm ( addr w -- )
158: dup disasm-rs .
159: disasm-imm disasm-relative . ;
160:
161: : disasm-rt,rs,imm ( addr w -- )
162: dup disasm-rt .
163: dup disasm-rs .
164: disasm-imm .
165: drop ;
166:
167: : disasm-rt,rs,uimm ( addr w -- )
168: dup disasm-rt .
169: dup disasm-rs .
170: disasm-uimm hex.
171: drop ;
172:
173: : disasm-rt,uimm ( addr w -- )
174: dup disasm-rt .
175: disasm-uimm hex.
176: drop ;
177:
178: : disasm-rt,imm,rs ( addr w -- )
179: dup disasm-rt .
180: dup disasm-imm .
181: dup disasm-rs .
182: 2drop ;
183:
184: : disasm-rd,rt,sa ( addr w -- )
185: dup disasm-rd .
186: dup disasm-rt .
187: dup disasm-shamt .
188: 2drop ;
189:
190: : disasm-rd,rt,rs ( addr w -- )
191: dup disasm-rd .
192: dup disasm-rt .
193: dup disasm-rs .
194: 2drop ;
195:
196: : disasm-rs. ( addr w -- )
197: dup disasm-rs .
198: 2drop ;
199:
200: : disasm-rd,rs ( addr w -- )
201: dup disasm-rd .
202: dup disasm-rs .
203: 2drop ;
204:
205: : disasm-rd. ( addr w -- )
206: dup disasm-rd .
207: 2drop ;
208:
209: : disasm-rs,rt ( addr w -- )
210: dup disasm-rs .
211: dup disasm-rt .
212: 2drop ;
213:
214: : disasm-rd,rs,rt ( addr w -- )
215: dup disasm-rd .
216: dup disasm-rs .
217: dup disasm-rt .
218: 2drop ;
219:
220: : disasm-rt,rd,z ( addr w -- )
221: dup disasm-rt .
222: dup disasm-rd .
223: dup disasm-copz .
224: 2drop ;
225:
226: : disasm-I-imm,z ( addr w -- )
227: tuck disasm-imm disasm-relative .
228: disasm-copz . ;
229:
230: \ meta-defining word for instruction format disassembling definitions
231:
232: \ The following word defines instruction-format words, which in turn
233: \ define anonymous words for disassembling specific instructions and
234: \ put them in the appropriate decode table.
235:
236: : define-format ( disasm-xt table-xt -- )
237: \ define an instruction format that uses disasm-xt for
238: \ disassembling and enters the defined instructions into table
239: \ table-xt
240: create 2,
241: does> ( u "inst" -- )
242: \ defines an anonymous word for disassembling instruction inst,
243: \ and enters it as u-th entry into table-xt
244: 2@ swap here name string, ( u table-xt disasm-xt c-addr ) \ remember string
245: noname create 2, \ define anonymous word
246: execute lastxt swap ! \ enter xt of defined word into table-xt
247: does> ( addr w -- )
248: \ disassemble instruction w at addr
249: 2@ >r ( addr w disasm-xt R: c-addr )
250: execute ( R: c-addr ) \ disassemble operands
251: r> count type ; \ print name
252:
253: \ all the following words have the stack effect ( u "name" )
254: ' disasm-J-target ' opc-tab-entry define-format asm-J-target
255: ' disasm-I-rs,rt,imm ' opc-tab-entry define-format asm-I-rs,rt,imm
256: ' disasm-I-rs,imm ' opc-tab-entry define-format asm-I-rs,imm1
257: ' disasm-rt,rs,imm ' opc-tab-entry define-format asm-I-rt,rs,imm
258: ' disasm-rt,rs,uimm ' opc-tab-entry define-format asm-I-rt,rs,uimm
259: ' disasm-rt,uimm ' opc-tab-entry define-format asm-I-rt,uimm
260: ' disasm-rt,imm,rs ' opc-tab-entry define-format asm-I-rt,offset,rs
261: ' disasm-rd,rt,sa ' funct-tab-entry define-format asm-special-rd,rt,sa
262: ' disasm-rd,rt,rs ' funct-tab-entry define-format asm-special-rd,rt,rs
263: ' disasm-rs. ' funct-tab-entry define-format asm-special-rs
264: ' disasm-rd,rs ' funct-tab-entry define-format asm-special-rd,rs
265: ' 2drop ' funct-tab-entry define-format asm-special-nothing
266: ' disasm-rd. ' funct-tab-entry define-format asm-special-rd
267: ' disasm-rs,rt ' funct-tab-entry define-format asm-special-rs,rt
268: ' disasm-rd,rs,rt ' funct-tab-entry define-format asm-special-rd,rs,rt
269: ' disasm-rd,rs ' funct-tab2-entry define-format asm-special2-rd,rs
270: ' disasm-rs,rt ' funct-tab2-entry define-format asm-special2-rs,rt
271: ' disasm-rd,rs,rt ' funct-tab2-entry define-format asm-special2-rd,rs,rt
272: ' disasm-I-rs,imm ' regimm-tab-entry define-format asm-regimm-rs,imm
273: ' 2drop ' cp0-tab-entry define-format asm-copz0
274: ' disasm-rt,rd,z ' copz-rs-tab-entry define-format asm-copz-rt,rd1
275: ' disasm-I-imm,z ' copz-rt-tab-entry define-format asm-copz-imm1
276:
277: : asm-I-rs,imm ( u1 u2 "name" -- ; compiled code: addr w -- )
278: nip asm-I-rs,imm1 ;
279:
280: : asm-copz-rt,rd ( u1 u2 "name" -- )
281: drop asm-copz-rt,rd1 ;
282:
283: : asm-copz-rt,offset,rs ( u "name" -- )
284: \ ignore these insts, we disassemble using asm-I-rt,offset,rs
285: drop name 2drop ;
286:
287: : asm-copz-imm ( u1 u2 u3 "name" -- )
288: drop nip asm-copz-imm1 ;
289:
290: include ./insts.fs
291:
292: previous set-current
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