barcode code 39 c# // C code: pSt->iVal = 0x33 ; MOV DWORD PTR [EAX + 0104h] , 0x33 in Visual C#.NET

Generator ANSI/AIM Code 39 in Visual C#.NET // C code: pSt->iVal = 0x33 ; MOV DWORD PTR [EAX + 0104h] , 0x33

// C code: pSt->iVal = 0x33 ; MOV DWORD PTR [EAX + 0104h] , 0x33
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// C code: strcpy ( pSt->szBuff , szName ) ; LEA ECX , szName // Push szName on the stack. PUSH ECX LEA ECX , [EAX + 4] // Get to the szBuff field.
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PUSH ECX CALL strcpy ADD ESP , 8 // strcpy is a __cdecl function.
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// C code: pSt->szBuff[ 1 ] = 'A' ; MOV BYTE PTR [EAX + 5] , 41h
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// C code: printf ( pSt->szBuff ) ; MOV LEA EAX , pSt ECX , [EAX + 4] // Get pSt back. EAX was destroyed // on the call to strcpy. PUSH ECX CALL DWORD PTR [printf] ADD ESP , 4 } } 304 // printf is a __cdecl function.
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A Complete Example Now that I've covered all the important parts of Intel assembly language, I want to show a complete example of a Win32 API function before turning to the Disassembly window. Listing 7-4 shows the completely commented disassembly of the lstrcpyA function from the Windows 2000 Service Pack 2 KERNEL32.DLL. The lstrcpyA function copies one string into another string. I chose this function because it shows a little bit of everything that I've discussed so far in this chapter and because the purpose of the function is easily understood. I made the comments, delineated by semicolons, as detailed as possible.
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Listing 7-4: lstrcpyA, a complete assembly language example ; Function prototype: ; LPTSTR __stdcall lstrcpy ( LPTSTR lpString1 , LPCTSTR lpString2 ) _lstrcpyA@8: ; Set up the standard stack frame prolog. PUSH MOV EBP EBP , ESP of setting up the SEH __try block. The address
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; Take care 0x77E88000
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; points to -1. This is the default setup to indicate an __except block ; with EXCEPTION_EXECUTE_HANDLER. PUSH PUSH PUSH MOV PUSH MOV 0FFFFFFFFh 77E88000h OFFSET __except_handler3 (77E8615Bh) EAX , DWORD PTR FS:[00000000h] EAX DWORD PTR FS:[0] , ESP
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; Instead of doing a "SUB ESP , 8" to reserve space for some more items ; on the stack related to SEH, the code generator chose to simply do ; two PUSH instructions. "PUSH ECX" is a single opcode (0x51) so this ; is the fastest way to go. PUSH PUSH ECX ECX
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; Save off registers that may be stepped on by the function. EBX is not ; used. However, it might be pushed for pipelining purposes. PUSH PUSH PUSH EBX ESI EDI
; The last little bit of SEH setup to record where the try block starts ; on the stack and the code is entering the try block. MOV AND DWORD PTR [EBP-18h] , ESP DWORD PTR [EBP-4] , 0
; The first step after setting up is to get the length of the string to ; copy. The string to copy is the second parameter. ; Move the second parameter, the string to be copied, into EDI. MOV EDI , DWORD PTR [EBP+0Ch] look through 4,294,967,295 bytes for the NULL
; lstrcpy will terminator. OR
; Remember that ECX is what REPNE SCAS uses to count the loop. ECX , 0FFFFFFFFH
; Zero out EAX to indicate what value to look for when scanning. XOR EAX , EAX
; Use the SCAS string instruction to rip through the string for NULL. REPNE SCAS BYTE PTR [EDI]
; Because ECX is counted down, switch all the bits so that the length of ; the string character. NOT ECX is in ECX. The length here includes the NULL
; Because the REPNE SCAS also incremented EDI, subtract the length of the ; string from EDI so that EDI points back to the start of the string. SUB EDI , ECX 306
; Hold the length of the string in EDX. EDX is not saved in this ; function as it is not required to be saved across C/C++ function ; calls. MOV ; Move the operand for MOV EDX , ECX second parameter into ESI since ESI is the source
; the string instructions. ESI , EDI
; Move the first parameter, the destination string, into EDI. MOV EDI , DWORD PTR [EBP+8]
; Save the second parameter into EAX. Again, EAX does not have to be ; saved across function calls. MOV EAX , EDI
; The string length was counted in bytes. Divide the string length by ; 4 to get the number of DWORDs. If the number of characters is odd, ; the REPE MOVS won't copy them all. Any remaining bytes are copied ; right after the REPE MOVS. SHR ECX , 2
; Copy the second parameter string into the first parameter string. REP MOVS DWORD PTR [EDI] , DWORD PTR [ESI]
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