-
Notifications
You must be signed in to change notification settings - Fork 1
/
V86IO.ASM
336 lines (270 loc) · 7 KB
/
V86IO.ASM
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
page ,132
title V86IO.ASM
;
; V86IO.ASM
; V86-mode I/O instruction support
;
; by Jeff Parsons 05-Jun-1992
; with a little help from Intel's 386 Programmer's Reference Manual :)
;
include all.inc
OPEN_CODE
extrn Debugger:near ; in 386trap.asm
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; EmulateInALnn (0E4h)
;
; ENTRY
; EBX -> megabyte alias (eg, pmbZero)
; ESI -> current instruction
; EBP -> ESF with valid v86* fields
; Interrupts disabled (so don't dink around!)
; EAX and EDX still contain the VM's settings
;
; EXIT
; Nothing in particular
;
; USES
; Anything it pleases
;
assume cs:CODE_SEG,ds:DATA_SEG,es:DATA_SEG,ss:DATA_SEG
public EmulateInALnn
EmulateInALnn proc near
test [_flTrace],TRACE_TRAPIO
jz short EmIO
push DEBUG_VIO
call Debugger ; call debugger router
test [_flTrace],TRACE_REEXEC
jnz short EmExit
EmIO:
movzx dx,byte ptr [ebx+esi+1] ; DX == imm. portion of opcode
in al,dx ; do the actual IN, update AL
mov byte ptr [ebp].esf_EAX,al
inc word ptr [ebp].esf_EIP ; advance instruction pointer
EmExit:
ret
EmulateInALnn endp
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; EmulateInAXnn (0E5h)
;
; ENTRY
; EBX -> megabyte alias (eg, pmbZero)
; ESI -> current instruction
; EBP -> ESF with valid v86* fields
; Interrupts disabled (so don't dink around!)
; EAX and EDX still contain the VM's settings
;
; EXIT
; Nothing in particular
;
; USES
; Anything it pleases
;
assume cs:CODE_SEG,ds:DATA_SEG,es:DATA_SEG,ss:DATA_SEG
public EmulateInAXnn
EmulateInAXnn proc near
test [_flTrace],TRACE_TRAPIO
jz short EmIO
push DEBUG_VIO
call Debugger ; call debugger router
test [_flTrace],TRACE_REEXEC
jnz short EmExit
EmIO:
movzx dx,byte ptr [ebx+esi+1] ; DX == imm. portion of opcode
in ax,dx ; do the actual IN, update AX
mov word ptr [ebp].esf_EAX,ax
inc word ptr [ebp].esf_EIP ; advance instruction pointer
EmExit:
ret
EmulateInAXnn endp
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; EmulateOutnnAL (0E6h)
;
; ENTRY
; EBX -> megabyte alias (eg, pmbZero)
; ESI -> current instruction
; EBP -> ESF with valid v86* fields
; Interrupts disabled (so don't dink around!)
; EAX and EDX still contain the VM's settings
;
; EXIT
; Nothing in particular
;
; USES
; Anything it pleases
;
assume cs:CODE_SEG,ds:DATA_SEG,es:DATA_SEG,ss:DATA_SEG
public EmulateOutnnAL
EmulateOutnnAL proc near
test [_flTrace],TRACE_TRAPIO
jz short EmIO
push DEBUG_VIO
call Debugger ; call debugger router
test [_flTrace],TRACE_REEXEC
jnz short EmExit
EmIO:
movzx dx,byte ptr [ebx+esi+1] ; DX == imm. portion of opcode
out dx,al ; do the actual OUT
inc word ptr [ebp].esf_EIP ; advance instruction pointer
EmExit:
ret
EmulateOutnnAL endp
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; EmulateOutnnAX (0E7h)
;
; ENTRY
; EBX -> megabyte alias (eg, pmbZero)
; ESI -> current instruction
; EBP -> ESF with valid v86* fields
; Interrupts disabled (so don't dink around!)
; EAX and EDX still contain the VM's settings
;
; EXIT
; Nothing in particular
;
; USES
; Anything it pleases
;
assume cs:CODE_SEG,ds:DATA_SEG,es:DATA_SEG,ss:DATA_SEG
public EmulateOutnnAX
EmulateOutnnAX proc near
test [_flTrace],TRACE_TRAPIO
jz short EmIO
push DEBUG_VIO
call Debugger ; call debugger router
test [_flTrace],TRACE_REEXEC
jnz short EmExit
EmIO:
movzx dx,byte ptr [ebx+esi+1] ; DX == imm. portion of opcode
out dx,ax ; do the actual OUT
inc word ptr [ebp].esf_EIP ; advance instruction pointer
EmExit:
ret
EmulateOutnnAX endp
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; EmulateInALDX (0ECh)
;
; ENTRY
; EBX -> megabyte alias (eg, pmbZero)
; ESI -> current instruction
; EBP -> ESF with valid v86* fields
; Interrupts disabled (so don't dink around!)
; EAX and EDX still contain the VM's settings
;
; EXIT
; Nothing in particular
;
; USES
; Anything it pleases
;
assume cs:CODE_SEG,ds:DATA_SEG,es:DATA_SEG,ss:DATA_SEG
public EmulateInALDX
EmulateInALDX proc near
test [_flTrace],TRACE_TRAPIO
jz short EmIO
push DEBUG_VIO
call Debugger ; call debugger router
test [_flTrace],TRACE_REEXEC
jnz short EmExit
EmIO:
in al,dx ; do the actual IN, update AL
mov byte ptr [ebp].esf_EAX,al
inc word ptr [ebp].esf_EIP ; advance instruction pointer
EmExit:
ret
EmulateInALDX endp
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; EmulateInAXDX (0EDh)
;
; ENTRY
; EBX -> megabyte alias (eg, pmbZero)
; ESI -> current instruction
; EBP -> ESF with valid v86* fields
; Interrupts disabled (so don't dink around!)
; EAX and EDX still contain the VM's settings
;
; EXIT
; Nothing in particular
;
; USES
; Anything it pleases
;
assume cs:CODE_SEG,ds:DATA_SEG,es:DATA_SEG,ss:DATA_SEG
public EmulateInAXDX
EmulateInAXDX proc near
test [_flTrace],TRACE_TRAPIO
jz short EmIO
push DEBUG_VIO
call Debugger ; call debugger router
test [_flTrace],TRACE_REEXEC
jnz short EmExit
EmIO:
in ax,dx ; do the actual IN, update AX
mov word ptr [ebp].esf_EAX,ax
inc word ptr [ebp].esf_EIP ; advance instruction pointer
EmExit:
ret
EmulateInAXDX endp
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; EmulateOutDXAL (0EEh)
;
; ENTRY
; EBX -> megabyte alias (eg, pmbZero)
; ESI -> current instruction
; EBP -> ESF with valid v86* fields
; Interrupts disabled (so don't dink around!)
; EAX and EDX still contain the VM's settings
;
; EXIT
; Nothing in particular
;
; USES
; Anything it pleases
;
assume cs:CODE_SEG,ds:DATA_SEG,es:DATA_SEG,ss:DATA_SEG
public EmulateOutDXAL
EmulateOutDXAL proc near
test [_flTrace],TRACE_TRAPIO
jz short EmIO
push DEBUG_VIO
call Debugger ; call debugger router
test [_flTrace],TRACE_REEXEC
jnz short EmExit
EmIO:
out dx,al ; do the actual OUT
inc word ptr [ebp].esf_EIP ; advance instruction pointer
EmExit:
ret
EmulateOutDXAL endp
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; EmulateOutDXAX (0EFh)
;
; ENTRY
; EBX -> megabyte alias (eg, pmbZero)
; ESI -> current instruction
; EBP -> ESF with valid v86* fields
; Interrupts disabled (so don't dink around!)
; EAX and EDX still contain the VM's settings
;
; EXIT
; Nothing in particular
;
; USES
; Anything it pleases
;
assume cs:CODE_SEG,ds:DATA_SEG,es:DATA_SEG,ss:DATA_SEG
public EmulateOutDXAX
EmulateOutDXAX proc near
test [_flTrace],TRACE_TRAPIO
jz short EmIO
push DEBUG_VIO
call Debugger ; call debugger router
test [_flTrace],TRACE_REEXEC
jnz short EmExit
EmIO:
out dx,ax ; do the actual OUT
inc word ptr [ebp].esf_EIP ; advance instruction pointer
EmExit:
ret
EmulateOutDXAX endp
CLOSE_CODE
end