-
Notifications
You must be signed in to change notification settings - Fork 5
/
Copy pathWMEM.ASM
434 lines (377 loc) · 5.99 KB
/
WMEM.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
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
; *******************************************************
; * *
; * Turbo Pascal Runtime Library *
; * Protected Mode Memory Manager *
; * *
; * Copyright (C) 1988,91 Borland International *
; * *
; *******************************************************
TITLE WMEM
INCLUDE SE.ASM
; Heap segment header
hsSignature EQU (WORD PTR 0)
hsReserved EQU (WORD PTR 2)
hsFreeList EQU (BYTE PTR 4)
hsMemFree EQU (WORD PTR 8)
hsNextHeap EQU (WORD PTR 10)
hsHeapOrg EQU (BYTE PTR 12)
; Heap block header
hbNext EQU (WORD PTR 0)
hbSize EQU (WORD PTR 2)
IF DPMIVersion
.286P
ENDIF
DATA SEGMENT WORD PUBLIC
; Externals
EXTRN HeapList:WORD,HeapLimit:WORD,HeapBlock:WORD
EXTRN HeapError:DWORD
IF WindowsVersion
EXTRN HeapAllocFlags:WORD
ENDIF
; Local variables
AllocSize DW ?
DATA ENDS
; External memory manager entry points
IF WindowsVersion
EXTRN GlobalAlloc:FAR,GlobalLock:FAR,GlobalFree:FAR
EXTRN GlobalHandle:FAR,GlobalUnlock:FAR,GlobalCompact:FAR
EXTRN GetFreeSpace:FAR
ELSE
EXTRN MemAllocateBlock:FAR,MemFreeBlock:FAR,MemQueryFreeMem:FAR
ENDIF
CODE SEGMENT BYTE PUBLIC
ASSUME CS:CODE,DS:DATA
; Externals
EXTRN HaltError:NEAR
; Publics
PUBLIC NewPtr,DisposePtr,MarkPtr,ReleasePtr
PUBLIC GetFreMem,GetFreMax,NewMemory,DisMemory
; New and GetMem standard procedures
NewPtr:
INC BP
PUSH BP
MOV BP,SP
PUSH DS
MOV AX,[BP+6]
CALL NewMemory
MOV SP,BP
POP BP
DEC BP
JC @@1
RETF 2
@@1: MOV AX,203
JMP HaltError
; Dispose and FreeMem standard procedures
DisposePtr:
INC BP
PUSH BP
MOV BP,SP
PUSH DS
MOV AX,[BP+6]
MOV CX,[BP+8]
MOV BX,[BP+10]
CALL DisMemory
MOV SP,BP
POP BP
DEC BP
JC MemError
RETF 6
; Mark and Release standard procedures
MemError:
MarkPtr:
ReleasePtr:
MOV AX,204
JMP HaltError
; MemAvail standard function
GetFreMem:
INC BP
PUSH BP
MOV BP,SP
PUSH DS
IF WindowsVersion
MOV AX,1000H ;GMEM_NOT_BANKED
PUSH AX
CALL GetFreeSpace
ELSE
PUSH 2
PUSH 0
CALL MemQueryFreeMem
ENDIF
MOV CX,HeapList
JCXZ @@2
@@1: MOV ES,CX
ADD AX,ES:hsMemFree
ADC DX,0
MOV CX,ES:hsNextHeap
CMP CX,HeapList
JNE @@1
@@2: MOV SP,BP
POP BP
DEC BP
RETF
; MaxAvail standard function
GetFreMax:
INC BP
PUSH BP
MOV BP,SP
PUSH DS
IF WindowsVersion
XOR AX,AX
PUSH AX
PUSH AX
CALL GlobalCompact
ELSE
PUSH 2
PUSH 0
CALL MemQueryFreeMem
ENDIF
OR DX,DX
JNE @@3
MOV CX,HeapList
JCXZ @@3
@@1: MOV ES,CX
CMP AX,ES:hsMemFree
JAE @@2
MOV AX,ES:hsMemFree
@@2: MOV CX,ES:hsNextHeap
CMP CX,HeapList
JNE @@1
@@3: MOV SP,BP
POP BP
DEC BP
RETF
; Allocate memory
; In AX = Size in bytes
; Out DX:AX = Block pointer
; CF = 1 if error
NewMemory:
OR AX,AX
JE @@7
MOV AllocSize,AX
@@1: CMP AX,HeapLimit
JB @@2
CALL NewGlobal
JNC @@6
CMP HeapLimit,0
JE @@4
MOV AX,AllocSize
MOV BX,HeapBlock
SUB BX,OFFSET hsHeapOrg
CMP AX,BX
JA @@4
CALL NewHeapMem
JMP SHORT @@3
@@2: CALL NewHeapMem
JNC @@6
MOV AX,AllocSize
CALL NewGlobal
@@3: JNC @@6
@@4: MOV AX,HeapError.ofs
OR AX,HeapError.seg
JE @@5
PUSH AllocSize
CALL HeapError
@@5: CMP AX,1
MOV AX,AllocSize
JA @@1
JB @@6
@@7: XOR AX,AX
CWD
@@6: RET
; Allocate global block
; In AX = Block size
; Out DX:AX = Block pointer
; CF = 1 if error
NewGlobal:
IF WindowsVersion
PUSH HeapAllocFlags
XOR DX,DX
PUSH DX
PUSH AX
CALL GlobalAlloc
CMP AX,1
JB @@1
PUSH AX
CALL GlobalLock
CLC
ELSE
PUSH 0
MOV DX,SP
PUSH 0 ;heapHandle
PUSH AX ;size
PUSH 2 ;attributes
PUSH 0 ;eventProc
PUSH 0
PUSH SS ;selector
PUSH DX
CALL MemAllocateBlock
POP DX
OR AX,AX
JE @@1
STC
ENDIF
@@1: RET
; Allocate heap block
; In AX = Block size
; Out DX:AX = Block pointer
; CF = 1 if error
NewHeapMem:
ADD AX,3
AND AL,0FCH
MOV CX,HeapList
JCXZ @@2
@@1: MOV ES,CX
CALL NewBlock
JNC @@3
MOV CX,ES:hsNextHeap
CMP CX,HeapList
JNE @@1
@@2: CALL NewSegment
JC @@4
CALL NewBlock
@@3: MOV HeapList,ES
MOV AX,BX
MOV DX,ES
@@4: RET
; Allocate heap segment
; Out ES = Heap segment
; CF = 1 if error
NewSegment:
PUSH AX
MOV AX,HeapBlock
CALL NewGlobal
JC @@2
MOV ES,DX
XOR DI,DI
CLD
MOV AX,'PT' ;hsSignature
STOSW
XOR AX,AX ;hsReserved
STOSW
MOV AX,OFFSET hsHeapOrg
STOSW ;hsFreeList.hbNext
XOR AX,AX
STOSW ;hsFreeList.hbSize
MOV AX,HeapBlock
SUB AX,OFFSET hsHeapOrg
STOSW ;hsMemFree
PUSH AX
MOV AX,ES
MOV CX,HeapList
JCXZ @@1
PUSH DS
MOV DS,CX
XCHG AX,DS:hsNextHeap
POP DS
@@1: STOSW ;hsNextHeap
XOR AX,AX
STOSW ;hbNext
POP AX
STOSW ;hbSize
@@2: POP AX
RET
; Allocate block from heap segment
; In AX = Block size
; ES = Heap segment
; Out BX = Block offset
; CF = 1 if error
NewBlock:
MOV BX,OFFSET hsFreeList
@@1: MOV SI,BX
MOV BX,ES:[BX].hbNext
CMP BX,1
JB @@3
MOV DX,ES:[BX].hbSize
SUB DX,AX
JB @@1
MOV CX,ES:[BX].hbNext
JE @@2
MOV DI,BX
ADD DI,AX
MOV ES:[DI].hbNext,CX
MOV ES:[DI].hbSize,DX
MOV CX,DI
@@2: MOV ES:[SI].hbNext,CX
SUB ES:hsMemFree,AX
CLC
@@3: RET
; Dispose memory
; In AX = Block size
; BX:CX = Block pointer
; Out CF = 1 if error
DisMemory:
OR AX,AX
JE @@4
JCXZ @@6
ADD AX,3
AND AL,0FCH
MOV ES,BX
MOV BX,CX
CMP ES:hsSignature,'PT'
JNE @@5
TEST BL,3
JNE @@5
MOV SI,OFFSET hsFreeList
@@1: MOV DI,SI
MOV SI,ES:[SI].hbNext
OR SI,SI
JE @@2
CMP BX,SI
JA @@1
JE @@5
@@2: MOV ES:[BX].hbNext,SI
MOV ES:[BX].hbSize,AX
ADD AX,ES:hsMemFree
MOV ES:hsMemFree,AX
ADD AX,OFFSET hsHeapOrg
CMP AX,HeapBlock
JE @@7
CALL @@3
MOV ES:[DI].hbNext,BX
MOV BX,DI
@@3: MOV SI,BX
ADD SI,ES:[BX].hbSize
CMP SI,ES:[BX].hbNext
JNE @@4
MOV AX,ES:[SI].hbNext
MOV ES:[BX].hbNext,AX
MOV AX,ES:[SI].hbSize
ADD ES:[BX].hbSize,AX
@@4: CLC
RET
@@5: STC
RET
@@6: MOV AX,DS
CMP AX,BX
JE @@5
IF WindowsVersion
PUSH BX
CALL GlobalHandle
OR AX,AX
JE @@5
PUSH AX
PUSH AX
CALL GlobalUnlock
CALL GlobalFree
ELSE
PUSH BX
CALL MemFreeBlock
ENDIF
CLC
RET
@@7: XOR AX,AX
MOV BX,ES
MOV DX,ES:hsNextHeap
CMP BX,DX
JE @@9
MOV AX,HeapList
@@8: MOV ES,AX
MOV AX,ES:hsNextHeap
CMP AX,BX
JNE @@8
MOV ES:hsNextHeap,DX
MOV AX,ES
@@9: MOV HeapList,AX
JMP @@6
CODE ENDS
END