511 lines
27 KiB
Plaintext
511 lines
27 KiB
Plaintext
1 ; asmfuncs.asm
|
|
2 ; Josh Holtrop
|
|
3 ; Created: 10/23/03
|
|
4 ; Modified: 02/26/04
|
|
5
|
|
6 [extern _putc]
|
|
7 [extern _console_memory]
|
|
8 [extern _cursorPosition]
|
|
9 [extern _video_drawConsole]
|
|
10 [extern _videoMode]
|
|
11
|
|
12 %macro jzfar 1
|
|
13 jnz %%skip
|
|
14 jmp %1
|
|
15 %%skip:
|
|
16
|
|
17 %endmacro
|
|
18
|
|
19 ;stores the parameter to the CR0 register
|
|
20 ;extern dword write_cr0(dword cr0);
|
|
21 [global _write_cr0]
|
|
22 _write_cr0:
|
|
23 00000000 55 push ebp
|
|
24 00000001 89E5 mov ebp, esp
|
|
25 00000003 8B4508 mov eax, [ebp+8]
|
|
26 00000006 0F22C0 mov cr0, eax
|
|
27 00000009 5D pop ebp
|
|
28 0000000A C3 ret
|
|
29
|
|
30 ;returns the value in the CR0 register
|
|
31 ;extern dword read_cr0();
|
|
32 [global _read_cr0]
|
|
33 _read_cr0:
|
|
34 0000000B 0F20C0 mov eax, cr0;
|
|
35 0000000E C3 ret
|
|
36
|
|
37 ;stores the parameter to the CR3 register
|
|
38 ;extern dword write_cr3(dword cr3);
|
|
39 [global _write_cr3]
|
|
40 _write_cr3:
|
|
41 0000000F 55 push ebp
|
|
42 00000010 89E5 mov ebp, esp
|
|
43 00000012 8B4508 mov eax, [ebp+8]
|
|
44 00000015 0F22D8 mov cr3, eax
|
|
45 00000018 5D pop ebp
|
|
46 00000019 C3 ret
|
|
47
|
|
48
|
|
49 ;returns the value in the CR2 register
|
|
50 ;extern dword read_cr2();
|
|
51 [global _read_cr2]
|
|
52 _read_cr2:
|
|
53 0000001A 0F20D0 mov eax, cr2;
|
|
54 0000001D C3 ret
|
|
55
|
|
56
|
|
57
|
|
58 ;returns the value in the CR3 register
|
|
59 ;extern dword read_cr3();
|
|
60 [global _read_cr3]
|
|
61 _read_cr3:
|
|
62 0000001E 0F20D8 mov eax, cr3;
|
|
63 00000021 C3 ret
|
|
64
|
|
65
|
|
66 ;compares one string to another
|
|
67 ;returns 0 if the strings are different
|
|
68 ;extern dword strcmp(char *str1, char *str2);
|
|
69 [global _strcmp]
|
|
70 _strcmp:
|
|
71 00000022 55 push ebp
|
|
72 00000023 89E5 mov ebp, esp
|
|
73 00000025 56 push esi
|
|
74 00000026 57 push edi
|
|
75
|
|
76 00000027 8B7508 mov esi, [ebp+8]
|
|
77 0000002A 8B7D0C mov edi, [ebp+12]
|
|
78 strcmp_loop1:
|
|
79 0000002D AC lodsb
|
|
80 0000002E 8A27 mov ah, [edi]
|
|
81 00000030 47 inc edi
|
|
82 00000031 38C4 cmp ah, al
|
|
83 00000033 750D jnz strcmp_ne
|
|
84 00000035 08C0 or al, al
|
|
85 00000037 7402 jz strcmp_e
|
|
86 00000039 EBF2 jmp strcmp_loop1
|
|
87 strcmp_e:
|
|
88 0000003B B801000000 mov eax, 1
|
|
89 00000040 EB02 jmp short strcmp_done
|
|
90 strcmp_ne:
|
|
91 00000042 31C0 xor eax, eax
|
|
92 strcmp_done:
|
|
93
|
|
94 00000044 5F pop edi
|
|
95 00000045 5E pop esi
|
|
96 00000046 5D pop ebp
|
|
97 00000047 C3 ret
|
|
98
|
|
99 ;copies a string from the source to the destination parameter
|
|
100 ;extern void strcpy(char *dest, char *src);
|
|
101 [global _strcpy]
|
|
102 _strcpy:
|
|
103 00000048 55 push ebp
|
|
104 00000049 89E5 mov ebp, esp
|
|
105 0000004B 56 push esi
|
|
106 0000004C 57 push edi
|
|
107 0000004D 8B7D08 mov edi, [ebp+8]
|
|
108 00000050 8B750C mov esi, [ebp+12]
|
|
109 strcpyloop:
|
|
110 00000053 AC lodsb
|
|
111 00000054 AA stosb
|
|
112 00000055 08C0 or al, al
|
|
113 00000057 75FA jnz strcpyloop
|
|
114 00000059 5F pop edi
|
|
115 0000005A 5E pop esi
|
|
116 0000005B 5D pop ebp
|
|
117 0000005C C3 ret
|
|
118
|
|
119 ;copies memory of n bytes from src to destination
|
|
120 ;void memcpy(void *dest, void *src, dword n);
|
|
121 [global _memcpy]
|
|
122 _memcpy:
|
|
123 0000005D 55 push ebp
|
|
124 0000005E 89E5 mov ebp, esp
|
|
125 00000060 56 push esi
|
|
126 00000061 57 push edi
|
|
127 00000062 51 push ecx
|
|
128 00000063 8B7D08 mov edi, [ebp+8]
|
|
129 00000066 8B750C mov esi, [ebp+12]
|
|
130 00000069 8B4D10 mov ecx, [ebp+16]
|
|
131
|
|
132 0000006C FC cld
|
|
133 0000006D F3A4 rep movsb
|
|
134
|
|
135 0000006F 59 pop ecx
|
|
136 00000070 5F pop edi
|
|
137 00000071 5E pop esi
|
|
138 00000072 5D pop ebp
|
|
139 00000073 C3 ret
|
|
140
|
|
141
|
|
142 ;copies memory of n dwords (n*4 bytes) from src to destination
|
|
143 ;void memcpyd(void *dest, void *src, dword n);
|
|
144 [global _memcpyd]
|
|
145 _memcpyd:
|
|
146 00000074 55 push ebp
|
|
147 00000075 89E5 mov ebp, esp
|
|
148 00000077 56 push esi
|
|
149 00000078 57 push edi
|
|
150 00000079 51 push ecx
|
|
151 0000007A 8B7D08 mov edi, [ebp+8]
|
|
152 0000007D 8B750C mov esi, [ebp+12]
|
|
153 00000080 8B4D10 mov ecx, [ebp+16]
|
|
154
|
|
155 00000083 FC cld
|
|
156 00000084 F3A5 rep movsd
|
|
157
|
|
158 00000086 59 pop ecx
|
|
159 00000087 5F pop edi
|
|
160 00000088 5E pop esi
|
|
161 00000089 5D pop ebp
|
|
162 0000008A C3 ret
|
|
163
|
|
164
|
|
165 ;sets num bytes at buffer to the value of c
|
|
166 ;void *memset(void *buffer, int c, int num);
|
|
167 [global _memset]
|
|
168 _memset:
|
|
169 0000008B 55 push ebp
|
|
170 0000008C 89E5 mov ebp, esp
|
|
171 0000008E 57 push edi
|
|
172 0000008F 51 push ecx
|
|
173 00000090 8B7D08 mov edi, [ebp+8]
|
|
174 00000093 57 push edi ;save for return address
|
|
175 00000094 8B450C mov eax, [ebp+12]
|
|
176 00000097 8B4D10 mov ecx, [ebp+16]
|
|
177
|
|
178 0000009A F3AA rep stosb
|
|
179
|
|
180 0000009C 58 pop eax
|
|
181 0000009D 59 pop ecx
|
|
182 0000009E 5F pop edi
|
|
183 0000009F 5D pop ebp
|
|
184 000000A0 C3 ret
|
|
185
|
|
186
|
|
187 ;sets num words at buffer to the value of c
|
|
188 ;void *memsetw(void *buffer, int c, int num);
|
|
189 [global _memsetw]
|
|
190 _memsetw:
|
|
191 000000A1 55 push ebp
|
|
192 000000A2 89E5 mov ebp, esp
|
|
193 000000A4 57 push edi
|
|
194 000000A5 51 push ecx
|
|
195 000000A6 8B7D08 mov edi, [ebp+8]
|
|
196 000000A9 57 push edi ;save for return address
|
|
197 000000AA 8B450C mov eax, [ebp+12]
|
|
198 000000AD 8B4D10 mov ecx, [ebp+16]
|
|
199
|
|
200 000000B0 F366AB rep stosw
|
|
201
|
|
202 000000B3 58 pop eax
|
|
203 000000B4 59 pop ecx
|
|
204 000000B5 5F pop edi
|
|
205 000000B6 5D pop ebp
|
|
206 000000B7 C3 ret
|
|
207
|
|
208
|
|
209 ;sets num dwords at buffer to the value of c
|
|
210 ;void *memsetd(void *buffer, int c, int num);
|
|
211 [global _memsetd]
|
|
212 _memsetd:
|
|
213 000000B8 55 push ebp
|
|
214 000000B9 89E5 mov ebp, esp
|
|
215 000000BB 57 push edi
|
|
216 000000BC 51 push ecx
|
|
217 000000BD 8B7D08 mov edi, [ebp+8]
|
|
218 000000C0 57 push edi ;save for return address
|
|
219 000000C1 8B450C mov eax, [ebp+12]
|
|
220 000000C4 8B4D10 mov ecx, [ebp+16]
|
|
221
|
|
222 000000C7 F3AB rep stosd
|
|
223
|
|
224 000000C9 58 pop eax
|
|
225 000000CA 59 pop ecx
|
|
226 000000CB 5F pop edi
|
|
227 000000CC 5D pop ebp
|
|
228 000000CD C3 ret
|
|
229
|
|
230
|
|
231 ;returns the number of characters in a string
|
|
232 ;extern dword strlen(char *str);
|
|
233 [global _strlen]
|
|
234 _strlen:
|
|
235 000000CE 55 push ebp
|
|
236 000000CF 89E5 mov ebp, esp
|
|
237 000000D1 56 push esi
|
|
238 000000D2 53 push ebx
|
|
239 000000D3 8B7508 mov esi, [ebp+8]
|
|
240 000000D6 31DB xor ebx, ebx
|
|
241 strlenloop:
|
|
242 000000D8 AC lodsb
|
|
243 000000D9 08C0 or al, al
|
|
244 000000DB 7403 jz strlendone
|
|
245 000000DD 43 inc ebx
|
|
246 000000DE EBF8 jmp strlenloop
|
|
247 strlendone:
|
|
248 000000E0 89D8 mov eax, ebx
|
|
249 000000E2 5B pop ebx
|
|
250 000000E3 5E pop esi
|
|
251 000000E4 5D pop ebp
|
|
252 000000E5 C3 ret
|
|
253
|
|
254 ;this function invalidates the page directory/table entry that
|
|
255 ; would be used to access the memory address given in the parameter
|
|
256 ;extern void invlpg_(dword addr);
|
|
257 [global _invlpg_]
|
|
258 _invlpg_:
|
|
259 000000E6 8B442404 mov eax, [esp+4]
|
|
260 000000EA 0F0138 invlpg [eax]
|
|
261 000000ED C3 ret
|
|
262
|
|
263
|
|
264 ;
|
|
265 ;void writeCursorPosition(word pos)
|
|
266 ;
|
|
267 [global _writeCursorPosition]
|
|
268 _writeCursorPosition:
|
|
269 000000EE 55 push ebp
|
|
270 000000EF 89E5 mov ebp, esp
|
|
271
|
|
272 000000F1 50 push eax
|
|
273 000000F2 53 push ebx
|
|
274 000000F3 52 push edx
|
|
275
|
|
276 000000F4 8B4508 mov eax, [ebp+8] ;cursor position in ax
|
|
277
|
|
278 000000F7 88C3 mov bl, al
|
|
279 000000F9 66BAD403 mov dx, 0x03D4
|
|
280 000000FD B00E mov al, 0x0E
|
|
281 000000FF EE out dx, al
|
|
282
|
|
283 00000100 6642 inc dx
|
|
284 00000102 88E0 mov al, ah
|
|
285 00000104 EE out dx, al
|
|
286
|
|
287 00000105 664A dec dx
|
|
288 00000107 B00F mov al, 0x0F
|
|
289 00000109 EE out dx, al
|
|
290
|
|
291 0000010A 6642 inc dx
|
|
292 0000010C 88D8 mov al, bl
|
|
293 0000010E EE out dx, al
|
|
294
|
|
295 0000010F 5A pop edx
|
|
296 00000110 5B pop ebx
|
|
297 00000111 58 pop eax
|
|
298 00000112 5D pop ebp
|
|
299
|
|
300 00000113 C3 ret
|
|
301
|
|
302
|
|
303 ;
|
|
304 ;word getCursorPosition()
|
|
305 ;
|
|
306 [global _getCursorPosition]
|
|
307 _getCursorPosition:
|
|
308 00000114 53 push ebx
|
|
309 00000115 52 push edx
|
|
310
|
|
311 00000116 31C0 xor eax, eax
|
|
312 00000118 66BAD403 mov dx, 0x03D4
|
|
313 0000011C B00E mov al, 0x0E
|
|
314 0000011E EE out dx, al
|
|
315
|
|
316 0000011F 6642 inc dx
|
|
317 00000121 EC in al, dx
|
|
318 00000122 88C3 mov bl, al
|
|
319
|
|
320 00000124 664A dec dx
|
|
321 00000126 B00F mov al, 0x0F
|
|
322 00000128 EE out dx, al
|
|
323
|
|
324 00000129 6642 inc dx
|
|
325 0000012B EC in al, dx
|
|
326 0000012C 88DC mov ah, bl
|
|
327
|
|
328 0000012E 5A pop edx
|
|
329 0000012F 5B pop ebx
|
|
330
|
|
331 00000130 C3 ret
|
|
332
|
|
333
|
|
334 ;
|
|
335 ;int puts(char *str)
|
|
336 ;
|
|
337 [global _puts]
|
|
338 _puts:
|
|
339 00000131 55 push ebp
|
|
340 00000132 89E5 mov ebp, esp
|
|
341 00000134 56 push esi
|
|
342 00000135 50 push eax
|
|
343 00000136 8B7508 mov esi, [ebp+8] ;esi = to string
|
|
344 puts_loop:
|
|
345 00000139 AC lodsb
|
|
346 0000013A 3C00 cmp al, 0
|
|
347 0000013C 740E jz puts_done
|
|
348 0000013E 50 push eax
|
|
349 0000013F E8(00000000) call _putc
|
|
350 00000144 81C404000000 add esp, 4
|
|
351 0000014A EBED jmp puts_loop
|
|
352
|
|
353 puts_done:
|
|
354 0000014C 58 pop eax
|
|
355 0000014D 5E pop esi
|
|
356 0000014E 5D pop ebp
|
|
357 0000014F C3 ret
|
|
358
|
|
359
|
|
360
|
|
361
|
|
362 [global _putDecu]
|
|
363 _putDecu:
|
|
364 00000150 55 push ebp
|
|
365 00000151 89E5 mov ebp, esp
|
|
366 00000153 81EC18000000 sub esp, 24
|
|
367 00000159 C745FC01000000 mov DWORD [ebp-4], 1
|
|
368 00000160 C645FB00 mov BYTE [ebp-5], 0
|
|
369 L2:
|
|
370 00000164 8B5508 mov edx, DWORD [ebp+8]
|
|
371 00000167 B8CDCCCCCC mov eax, -858993459
|
|
372 0000016C F7E2 mul edx
|
|
373 0000016E 89D0 mov eax, edx
|
|
374 00000170 C1E803 shr eax, 3
|
|
375 00000173 3B45FC cmp eax, DWORD [ebp-4]
|
|
376 00000176 7305 jae L4
|
|
377 00000178 E912000000 jmp L3
|
|
378 L4:
|
|
379 0000017D 8B45FC mov eax, DWORD [ebp-4]
|
|
380 00000180 89C2 mov edx, eax
|
|
381 00000182 C1E202 sal edx, 2
|
|
382 00000185 01C2 add edx, eax
|
|
383 00000187 8D0412 lea eax, [edx+edx]
|
|
384 0000018A 8945FC mov DWORD [ebp-4], eax
|
|
385 0000018D EBD5 jmp L2
|
|
386 L3:
|
|
387 0000018F 90 nop
|
|
388 L5:
|
|
389 00000190 817DFC01000000 cmp DWORD [ebp-4], 1
|
|
390 00000197 7705 ja L7
|
|
391 00000199 E959000000 jmp L6
|
|
392 L7:
|
|
393 0000019E 8B5508 mov edx, DWORD [ebp+8]
|
|
394 000001A1 89D0 mov eax, edx
|
|
395 000001A3 BA00000000 mov edx, 0
|
|
396 000001A8 F775FC div DWORD [ebp-4]
|
|
397 000001AB 8945F4 mov DWORD [ebp-12], eax
|
|
398 000001AE 8A45F4 mov al, BYTE [ebp-12]
|
|
399 000001B1 8845FB mov BYTE [ebp-5], al
|
|
400 000001B4 B800000000 mov eax, 0
|
|
401 000001B9 8A45FB mov al, BYTE [ebp-5]
|
|
402 000001BC 0FAF45FC imul eax, DWORD [ebp-4]
|
|
403 000001C0 294508 sub DWORD [ebp+8], eax
|
|
404 000001C3 8B55FC mov edx, DWORD [ebp-4]
|
|
405 000001C6 B8CDCCCCCC mov eax, -858993459
|
|
406 000001CB F7E2 mul edx
|
|
407 000001CD 89D0 mov eax, edx
|
|
408 000001CF C1E803 shr eax, 3
|
|
409 000001D2 8945FC mov DWORD [ebp-4], eax
|
|
410 000001D5 8D45FB lea eax, [ebp-5]
|
|
411 000001D8 800030 add BYTE [eax], 48
|
|
412 000001DB 81EC0C000000 sub esp, 12
|
|
413 000001E1 B800000000 mov eax, 0
|
|
414 000001E6 8A45FB mov al, BYTE [ebp-5]
|
|
415 000001E9 50 push eax
|
|
416 000001EA E8(00000000) call _putc
|
|
417 000001EF 81C410000000 add esp, 16
|
|
418 000001F5 EB99 jmp L5
|
|
419 L6:
|
|
420 000001F7 81EC0C000000 sub esp, 12
|
|
421 000001FD 8A4508 mov al, BYTE [ebp+8]
|
|
422 00000200 0530000000 add eax, 48
|
|
423 00000205 25FF000000 and eax, 255
|
|
424 0000020A 50 push eax
|
|
425 0000020B E8(00000000) call _putc
|
|
426 00000210 81C410000000 add esp, 16
|
|
427 00000216 C9 leave
|
|
428 00000217 C3 ret
|
|
429
|
|
430
|
|
431
|
|
432
|
|
433 [global _putDec]
|
|
434 _putDec:
|
|
435 00000218 55 push ebp
|
|
436 00000219 89E5 mov ebp, esp
|
|
437 0000021B 81EC18000000 sub esp, 24
|
|
438 00000221 817D0800000000 cmp DWORD [ebp+8], 0
|
|
439 00000228 7919 jns L9
|
|
440 0000022A 81EC0C000000 sub esp, 12
|
|
441 00000230 682D000000 push 45
|
|
442 00000235 E8(00000000) call _putc
|
|
443 0000023A 81C410000000 add esp, 16
|
|
444 00000240 F75D08 neg DWORD [ebp+8]
|
|
445 L9:
|
|
446 00000243 C745FC01000000 mov DWORD [ebp-4], 1
|
|
447 0000024A C645FB00 mov BYTE [ebp-5], 0
|
|
448 L10:
|
|
449 0000024E 8B4508 mov eax, DWORD [ebp+8]
|
|
450 00000251 3B45FC cmp eax, DWORD [ebp-4]
|
|
451 00000254 7305 jae L12
|
|
452 00000256 E912000000 jmp L11
|
|
453 L12:
|
|
454 0000025B 8B45FC mov eax, DWORD [ebp-4]
|
|
455 0000025E 89C2 mov edx, eax
|
|
456 00000260 C1E202 sal edx, 2
|
|
457 00000263 01C2 add edx, eax
|
|
458 00000265 8D0412 lea eax, [edx+edx]
|
|
459 00000268 8945FC mov DWORD [ebp-4], eax
|
|
460 0000026B EBE1 jmp L10
|
|
461 L11:
|
|
462 0000026D 8B55FC mov edx, DWORD [ebp-4]
|
|
463 00000270 B8CDCCCCCC mov eax, -858993459
|
|
464 00000275 F7E2 mul edx
|
|
465 00000277 89D0 mov eax, edx
|
|
466 00000279 C1E803 shr eax, 3
|
|
467 0000027C 8945FC mov DWORD [ebp-4], eax
|
|
468 L13:
|
|
469 0000027F 817DFC01000000 cmp DWORD [ebp-4], 1
|
|
470 00000286 7705 ja L15
|
|
471 00000288 E959000000 jmp L14
|
|
472 L15:
|
|
473 0000028D 8B5508 mov edx, DWORD [ebp+8]
|
|
474 00000290 89D0 mov eax, edx
|
|
475 00000292 BA00000000 mov edx, 0
|
|
476 00000297 F775FC div DWORD [ebp-4]
|
|
477 0000029A 8945F4 mov DWORD [ebp-12], eax
|
|
478 0000029D 8A45F4 mov al, BYTE [ebp-12]
|
|
479 000002A0 8845FB mov BYTE [ebp-5], al
|
|
480 000002A3 B800000000 mov eax, 0
|
|
481 000002A8 8A45FB mov al, BYTE [ebp-5]
|
|
482 000002AB 0FAF45FC imul eax, DWORD [ebp-4]
|
|
483 000002AF 294508 sub DWORD [ebp+8], eax
|
|
484 000002B2 8B55FC mov edx, DWORD [ebp-4]
|
|
485 000002B5 B8CDCCCCCC mov eax, -858993459
|
|
486 000002BA F7E2 mul edx
|
|
487 000002BC 89D0 mov eax, edx
|
|
488 000002BE C1E803 shr eax, 3
|
|
489 000002C1 8945FC mov DWORD [ebp-4], eax
|
|
490 000002C4 8D45FB lea eax, [ebp-5]
|
|
491 000002C7 800030 add BYTE [eax], 48
|
|
492 000002CA 81EC0C000000 sub esp, 12
|
|
493 000002D0 B800000000 mov eax, 0
|
|
494 000002D5 8A45FB mov al, BYTE [ebp-5]
|
|
495 000002D8 50 push eax
|
|
496 000002D9 E8(00000000) call _putc
|
|
497 000002DE 81C410000000 add esp, 16
|
|
498 000002E4 EB99 jmp L13
|
|
499 L14:
|
|
500 000002E6 81EC0C000000 sub esp, 12
|
|
501 000002EC 8A4508 mov al, BYTE [ebp+8]
|
|
502 000002EF 0530000000 add eax, 48
|
|
503 000002F4 25FF000000 and eax, 255
|
|
504 000002F9 50 push eax
|
|
505 000002FA E8(00000000) call _putc
|
|
506 000002FF 81C410000000 add esp, 16
|
|
507 00000305 C9 leave
|
|
508 00000306 C3 ret
|
|
509
|
|
510
|