5.4 stack operation
5.4.2 POP and PUSH instruction
The 32-bit instruction PUSHFD content EFLAGS register onto the stack, the top location POPFD put the contents of the pop instructions to the EFLAGS register:
PUSHAD accordance with instructions EAX, ECX, EDX, EBX, ESP ( PUSHAD value before execution), EBP, ESI and EDI order, all 32-bit general registers onto the stack.
POPAD same instructions in reverse order to eject the stack register. Similarly, PUSHA sequential instruction (AX, CX, DX, BX , SP, BP, SI and DI) 16-bit general registers onto the stack.
POPA instructions in reverse order to eject the same register stack. In 16-bit mode, only PUSHA and POPA instructions.
5.8 Programming Exercises
1. Draw colored text
TITLE test project INCLUDE Irvine32.inc .data buffer BYTE 'Hk_Mayfly',13,10,0 color DWORD 1,2,3,4,6 .code main PROC mov esi,OFFSET color mov edx,OFFSET buffer mov ecx,4 S: mov eax,[esi] shl eax,4 add eax,[esi+TYPE color] call SetTextColor call WriteString add esi,TYPE color loop S call WaitMsg exit main ENDP END main
2. Fibonacci file
TITLE the Test Project the INCLUDE Irvine32. INC. Buf_size = 47 .data filename BYTE ' Fib.txt ' , 0 FileHandle DWORD? ; File handle the Num DWORD buf_size dup ( 0 ) .code main PROC ; handle for the file to build relationships mov edx, OFFSET filename Call CreateOutputFile MOV FILEHANDLE, EAX MOV ESI, 0 MOV [the Num], . 1 MOV [the Num the Num the TYPE +], . 1 MOV ECX, 45 ;Third calculation cycle to 47 Fibonacci numbers S: MOV EAX, [ESI + the Num] the Add EAX, [ESI + the Num the Num + the TYPE] the Add ESI, the Num the TYPE MOV [the Num the Num the TYPE + + ESI], EAX Loop S ; the data is written to a file Num MOV EAX, FILEHANDLE MOV EDX, the OFFSET Num MOV ECX, SIZE Num Call the WriteToFile ; the display data to the terminal in Num MOV ESI, the OFFSET Num MOV ECX, lengthof Num MOV EBX, the TYPE Num Call DumpMem Call WaitMsg Exit main ENDP the END main
3. The simple addition (1)
TITLE Test Project the INCLUDE Irvine32. Inc is Strl EQU < ' Please TWO INPUT NUM: ' , 13 is , 10 , 0 > .data Str2 in BYTE Strl .code main the PROC ; clear screen Call clrscr ; Position the cursor MOV DH, 12 is MOV DL, 39 Call gotoxy ; output prompt string MOV EDX, the OFFSET Str2 in Call WriteString ; reading a first number, to save EBX Call ReadInt MOV EBX, EAX Call ReadInt ; reads the second number, and added to the first number, and to obtain, in the screen display the Add EAX, EBX Call writeInt Call WaitMsg Exit main ENDP the END main
4. simple addition (2)
TITLE Test Project . Irvine32 the INCLUDE inc is Strl EQU < ' Please TWO INPUT NUM: ' , 13 is , 10 , 0 > .data Str2 in BYTE Strl .code main the PROC MOV ECX, . 3 S: ; clear screen Call clrscr ; Position the cursor MOV DH, 12 is MOV DL, 39 Call gotoxy ; output prompt string MOV EDX, the OFFSET Str2 in Call WriteString ; reading a first number, to save ebx Call ReadInt MOV EBX, EAX Call ReadInt ; reads the second number, and added to the first number, and to obtain, in the screen display the Add EAX, EBX Call writeInt Call WaitMsg Loop S Call WaitMsg Exit main ENDP the END main
5. random integer
TITLE test project INCLUDE Irvine32. Add .data randVal DWORD 50 dup (?) .code main PROC mov ECX, 50 mov esi, 0 S: mov EAX, 41 call Random Range mov [esi + randVal], EAX sub [randVal + esi], 20 add esi, TYPE randVal walk S mov esi, OFFSET randVal mov ECX, LENGTHOF randVal mov EBX, TYPE randVal call DumpMem call WaitMsg exit main ENDP END main
6. random string
TITLE test project INCLUDE Irvine32. Add .data randVal BYTE 13 dup ( 0 ) .code main PROC mov ECX, 20 S: push ECX mov esi, 0 mov ECX, 10 S2: mov EAX, 26 call Random Range mov [esi + randVal], all add [randVal + esi], 65 add esi, 1 walk S2 mov [esi + randVal] 10 add esi,1 mov [randVal + esi], 13 add esi, 1 mov [randVal + esi], 0 mov EDX, OFFSET randVal call WriteString pop ECX walk S mov esi, OFFSET randVal mov ECX, LENGTHOF randVal mov EBX, 1 call DumpMem call WaitMsg exit main ENDP END main
7. random screen position
TITLE Test Project . Irvine32 the INCLUDE inc is .code main the PROC MOV ECX, 100 S: MOV eax, 0 Call GetMaxXY ; return value dx, the DH line memory, memory columns DL MOV Al, DL Call RandomRange ; imported from the eax, the return value is stored in eax MOV DL, Al MOV Al, DH Call RandomRange MOV DH, Al Call gotoxy ; imported from the dx MOV Al, ' A ' Call WriteChar MOV eax,100 call Delay loop S call WaitMsg exit main ENDP END main
8. Color Matrix
TITLE test project INCLUDE Irvine32.inc .data Str1 BYTE 'CTF{It_is_easy}',13,10,0 .code main PROC mov eax,0 mov esi,0 mov ecx,15 S: push ecx mov ecx,15 S1: shl esi,4 add eax,esi call setTextColor mov edx,OFFSET Str1 call WriteString inc esi loop S1 pop ecx inc eax loop S call WaitMsg exit main ENDP END main
9. summation program
TITLE test project INCLUDE Irvine32.inc ARRAY_SIZE = 20 .data Info BYTE 'How many integers will be added?',13,10,0 Info1 BYTE "The array cannot be large than",0 LineFeed BYTE 13,10,0 .code main PROC ;输入数组大小 mov edx,OFFSET Info call WriteString call ReadInt ;比较是否越界 cmp eax,ARRAY_SIZE jbe success ;越界输出 mov edx,OFFSET Info1 call WriteString mov eax,ARRAY_SIZE call WriteInt mov edx,OFFSET LineFeed call WriteString success: call WaitMsg exit main ENDP END main
