我的程序可以很好地进行汇编和链接，但是我从来没有摆脱过最初的getPointsLoop。我以为问题是我没有在结构中初始化我的size变量（按照给出的示例代码），但是即使当我将ecx设置为5而不是ArrCount时，（也应该是相同的值）我的循环永远不会结束。我没有在我看到的循环中修改ecx，因此看来它应该在5次迭代后退出，但它只会不断获取int。可以看到我要去哪里了吗？
STRUC Point ;define a point structure
.x RESD 1 ;reserve 4 bytes for x coordinate
.y RESD 1 ;reserve 4 bytes for y coordinate
.size:
ENDSTRUC
section .data ;data section
msgPt: db "What are the x and y values for the points?", 10, 0
msgPtL: equ $-msgPt
msg2: db"The point coardinates are ", 10 ,0
msgL2: equ $-msg2
formatPointScan: dd "%d", 0
xVal: dd 0
yVal: dd 0
section .bss ;bss section
PtArr: RESB Point.size*5 ;reserver place for 5 structures
;PtArr points to teh start of array
ArrCount: EQU($ - PtArr)/Point.size ;should be 5
section .text
extern scanf
global main
main:
push ebp
mov ebp, esp
mov ecx, msgPt
mov edx, msgPtL
call PString
mov ecx, ArrCount ;ecx has the number of array elements
mov esi, PtArr ;esi contains address of first struct in array
getPointsLoop:
push xVal
push formatPointScan
call scanf
mov dword[esi + Point.x], xVal
push yVal
push formatPointScan
call scanf
mov dword[esi + Point.y], yVal
add esi, Point.size
loop getPointsLoop ;loop until ecx is zero
mov ecx, msg2
mov edx, msgL2
call PString
mov ecx, ArrCount ;set ecx to num of array elements
mov esi, PtArr ;pont esi to 1st element of array
printPointsLoop:
mov eax, [esi + Point.x] ;indirect access to x value
call PrintDec
call println
mov eax, [esi + Point.y] ;indirect access to y value
call PrintDec
call println
add esi, Point.size
loop printPointsLoop
;exit program and cleaning
mov esp, ebp
pop ebp
ret
PString:; save register values of the called function
pusha
mov eax,4 ; use 'write' system call = 4
mov ebx,1 ; file descriptor 1 = STDOUT
int 80h ; call the kernel
; restore the old register values of the called function
popa
ret
println:
;will call PString func
;will change content of ecx and edx
;need to save registers used by the main program
section .data
nl db 10
section .text
pusha
mov ecx, nl
mov edx, 1
call PString
;return original register values
popa
ret
PrintDec:
;saves all registers so they return unmodified
;build the function to handle dword size
section .bss
decstr resb 10 ; 10 32-bit digits
ct1 resd 1 ;keep track of dec-string size
section .text
pusha; save registers
mov dword[ct1],0 ;initially assume 0
mov edi, decstr ; edi points to dec-string
add edi, 9 ; moved to the last element of string
xor edx, edx ; clear edx for 64-bit div
whileNotZero:
mov ebx, 10 ; get ready to divide by 10
div ebx ; divide by 10
add edx, '0' ; convert to ascii
mov byte[edi], dl ; put it in string
dec edi ; move to next char in str
inc dword[ct1] ; inc char counter
xor edx, edx ; clear edx
cmp eax, 0 ;is remainder 0?
jne whileNotZero ;if no, keep on looping
inc edi ; conversion finished, bring edi
mov ecx, edi ; back to start of string. make ecx
mov edx, [ct1] ; point to counterm edx gets # chars
mov eax, 4 ; print to stdout
mov ebx, 1
int 0x80 ; call kernel
popa ; restore registers
ret