Question

我在数据部分中定义了一个2d数组和两个1d数组（一个用于列和，一个用于行和），我写了一个函数，将2d数组加到1d数组中。我正在使用eax和ebx作为2d数组的索引，但是当eax或ebx因为1并尝试访问内存中的未知地址时，我的程序失败。如何修复此行中对内存的访问：

mov edx,[ebp+columnsSumArray+type dword*ebx]

这是我的计划：

    .386
.MODEL flat,stdcall
.STACK 4096
extern ExitProcess@4:Near

.data                  ;Data area 
array2D     Dword 1,2,3,4           ; 3 Rows by 4 Columns
            Dword 5,6,7,8
            Dword 9,10,11,12

rowSumArray Dword 1,1,1             ; two sum init array's
columnSumArray Dword 1,1,1,1

.code                 ;Code area
_main:

    mov eax,offset columnSumArray
    push offset columnSumArray
    push offset rowSumArray
    push 4
    push 3
    push offset array2D

    call Sum2DimArray


    push    0                       ;Black box. Always terminate
    call    ExitProcess@4          ;program with this sequence


;----------------------------------------------------------------   
; Name: Sum2DimArray
; Input: 2d array pointer, rows, columns, rowSumArray, columnSumArray, 
; Description: this function sum the rows item in the 2d array and put it in the rowSumArray,
;              and sum the columns and put it in the columnSumArray
;----------------------------------------------------------------
Sum2DimArray PROC

    ParamSize = 5*4
    matrixAddress = 8
    rowsNumPlace = matrixAddress + 4
    columnsNumPlace = rowsNumPlace + 4
    rowsSumArray = columnsNumPlace + 4
    columnsSumArray = rowsSumArray + 4

    push ebp                            ; using the ebp as function variables pointer
    mov ebp,esp

    push ecx
    push eax
    push ebx
    push esi                            ; 2d array item pointer 
    push edx                    

    mov eax,0                           ; rows counter
    mov ebx,0                           ; columns counter

    mov esi,[ebp+matrixAddress]         ; esi points on the first 2d array value

    RowsLoop:                           ; rows loop
        mov ebx,0
        ColumnsLoop:                    ; columns loop

            mov ecx,[esi]               ; ecx is the current value

            mov edx,[ebp+rowsSumArray+type dword*eax]
            add [edx],ecx
            mov edx,[ebp+columnsSumArray+type dword*ebx]
            add [edx],ecx

            inc ebx
            add esi,sizeof Dword
            cmp ebx,[ebp+columnsNumPlace]
            jne ColumnsLoop

        inc eax
        cmp eax,[ebp+rowsNumPlace]
        jne RowsLoop

    pop edx
    pop esi
    pop ebx
    pop eax
    pop ecx
    pop ebp
    ret ParamSize

Sum2DimArray ENDP

end   _main              ;End of program. Label is the entry point.

Answer 1

您正在将sum数组的偏移量添加到错误的位置。

mov edx,[ebp+rowsSumArray+type dword*eax]
add [edx],ecx
mov edx,[ebp+columnsSumArray+type dword*ebx]
add [edx],ecx

应阅读：

mov edx,[ebp+rowsSumArray]
add [edx+type dword*eax],ecx
mov edx,[ebp+columnsSumArray]
add [edx+type dword*ebx],ecx

那就是你应该首先从ebp的已知偏移量加载堆栈中的指针，然后为所需元素添加偏移量。

装配中的2D阵列

1 个答案: