汇编代码程序发生分段错误

发布于 2024-10-24 03:09:14 字数 3003 浏览 5 评论 0原文

运行代码时,我不断收到分段错误错误。一切都编译得很好,但我似乎无法让它做我想做的事。该程序要求用户输入 3 个整数,然后询问用户他们认为这些数字的平均值是多少,考虑到这一点,然后返回用户是否猜对了

    segment .data
;
; Output strings
;
prompt1          db    "Enter a positive integer: ", 0
prompt2          db    "Enter a second positive integer: ", 0
prompt3          db    "Enter a third positive integer: ", 0
prompt4      db    "Enter a guess of their average: ", 0   
outmsg1          db    "You entered ", 0
outmsg2          db    " and ", 0
outmsg3          db    " and ", 0
outmsg4      db    "You guessed that the average is ", 0
outmsg5      db    "You did you guess correctly? (0 = no, 1 = yes)", 0
avermsg      db    "The average of the numbers is ", 0


segment .bss

input1   resd 1
input2   resd 1
input3   resd 1
input4   resd 1
guess    resd 1

segment .text
        Global  main
main:
        enter   0,0               ; setup routine
        pusha

        mov     eax, prompt1      ; print out prompt1
        call    print_string

        call    read_int          ; read integer    
        mov     [input1], eax     ; store integer into input1


        mov     eax, prompt2      ; print out prompt2
        call    print_string

    call    read_int      ; read integer
    mov [input2], eax     ; store integer into input2

    mov     eax, prompt3      ; print out prompt3
        call    print_string

    call    read_int      ; read integer
    mov     [input3], eax     ; store integer into input3

    mov eax, prompt4      ; print out prompt4
    call    print_string      

    call    read_int      ; read integer
    mov [guess], eax


    mov eax, [input1]     ; eax = dword at input1
    add eax, [input2]     ; eax += dword at input2
    add eax, [input3]     ; eax += dword at input3
    mov ebx, 3          
    div ebx       ; divides the sum by 3
    mov ecx, eax      ; freeing up eax, puts quotient into ecx

    dump_regs 1       ; print out register values

; next print out results    
    mov    eax, outmsg1
    call   print_string   ; print out first message
    mov    eax, [input1]
    call   print_int

    mov    eax, outmsg2   
    call   print_string   ; print out second message
    mov    eax, [input2]
    call   print_int

    mov    eax, outmsg3
    call   print_string       ; print out  thrid message
    mov    eax, [input3]
    call   print_int    

    mov eax, outmsg4
    call    print_string      ; print out fourth message
    mov eax, [input4]
    call    print_int   

    xor    ebx, ebx
    cmp    ecx, [guess]

    sete   bl
    neg    ebx
    mov    edx, ebx
    and    ecx, edx
    not    ebx
    and    ebx, [guess]
    or     edx, ebx

    mov    eax, outmsg5
    call   print_string
    mov    ecx, eax
    call   print_int

    mov    eax, [avermsg]
    call   print_string   ; print out final message
    mov    ecx, edx
    call   print_int      ; print out average of ebx
    call   print_nl       ; print new line

    popa
    mov eax, 0        ; return back to C
    leave
    ret

I keep getting a segmentation fault error when running my code. Everything has compiled well, but I can't seem to get it to do what I want. The program is to ask the user to enter 3 integers, then ask the user what they think the average of the numbers would be, take that into account and then come back with whether or not the user guessed correctly

    segment .data
;
; Output strings
;
prompt1          db    "Enter a positive integer: ", 0
prompt2          db    "Enter a second positive integer: ", 0
prompt3          db    "Enter a third positive integer: ", 0
prompt4      db    "Enter a guess of their average: ", 0   
outmsg1          db    "You entered ", 0
outmsg2          db    " and ", 0
outmsg3          db    " and ", 0
outmsg4      db    "You guessed that the average is ", 0
outmsg5      db    "You did you guess correctly? (0 = no, 1 = yes)", 0
avermsg      db    "The average of the numbers is ", 0


segment .bss

input1   resd 1
input2   resd 1
input3   resd 1
input4   resd 1
guess    resd 1

segment .text
        Global  main
main:
        enter   0,0               ; setup routine
        pusha

        mov     eax, prompt1      ; print out prompt1
        call    print_string

        call    read_int          ; read integer    
        mov     [input1], eax     ; store integer into input1


        mov     eax, prompt2      ; print out prompt2
        call    print_string

    call    read_int      ; read integer
    mov [input2], eax     ; store integer into input2

    mov     eax, prompt3      ; print out prompt3
        call    print_string

    call    read_int      ; read integer
    mov     [input3], eax     ; store integer into input3

    mov eax, prompt4      ; print out prompt4
    call    print_string      

    call    read_int      ; read integer
    mov [guess], eax


    mov eax, [input1]     ; eax = dword at input1
    add eax, [input2]     ; eax += dword at input2
    add eax, [input3]     ; eax += dword at input3
    mov ebx, 3          
    div ebx       ; divides the sum by 3
    mov ecx, eax      ; freeing up eax, puts quotient into ecx

    dump_regs 1       ; print out register values

; next print out results    
    mov    eax, outmsg1
    call   print_string   ; print out first message
    mov    eax, [input1]
    call   print_int

    mov    eax, outmsg2   
    call   print_string   ; print out second message
    mov    eax, [input2]
    call   print_int

    mov    eax, outmsg3
    call   print_string       ; print out  thrid message
    mov    eax, [input3]
    call   print_int    

    mov eax, outmsg4
    call    print_string      ; print out fourth message
    mov eax, [input4]
    call    print_int   

    xor    ebx, ebx
    cmp    ecx, [guess]

    sete   bl
    neg    ebx
    mov    edx, ebx
    and    ecx, edx
    not    ebx
    and    ebx, [guess]
    or     edx, ebx

    mov    eax, outmsg5
    call   print_string
    mov    ecx, eax
    call   print_int

    mov    eax, [avermsg]
    call   print_string   ; print out final message
    mov    ecx, edx
    call   print_int      ; print out average of ebx
    call   print_nl       ; print new line

    popa
    mov eax, 0        ; return back to C
    leave
    ret

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评论(2

老娘不死你永远是小三 2024-10-31 03:09:14

如果不知道您使用的编译器,则很难查明问题所在。

分段错误发生在保护模式下,当您尝试访问您无权访问的分段时。

您在此处声明 3 个不同的段。在调用 print_string 之前,您必须确保您的 ds 寄存器已初始化为 .data 段。

这似乎也是有问题的,在 read_int 之后,您将数据保存到 input1 变量中,该变量似乎与您用于打印消息的段位于不同的段中,但您不这样做更改ds

我不熟悉您的编译器如何准确处理这些段,因此请提供其文档的链接。

It is not easy to pinpoint the problem without knowing the compiler you use.

Segmentation fault hapens in protected mode, when you try to access a segment you have no permissions to access.

You declare 3 diferent segments here. You have to make sure your ds register is initialized to your .data segment, before calling print_string.

It also seems problematic that after read_int you save the data to the input1 variable which seems to be in a different segment than that you used for printing the message, but you do not change ds.

I'm not familiar how exactly your compiler handles these segments, so please give a link to its documentation.

昔梦 2024-10-31 03:09:14
div ebx

问题似乎就在这里。您必须将 edx 归零,因为 is 是除数的高位字,因此您可能会遇到类似除法溢出异常的情况。
如果情况并非如此,则问题可能出在您的某些 I/O 例程中

div ebx

the problem seems to be here. You have to zero out edx since is is the high order word of the divisor, so probably you're getting something like a division overflow exception.
If this isn't the case probably the problem is in some of your I/O routines

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