x86汇编程序中的分段错误

Question

我制作了一个汇编程序来计算斐波那契数。它有很多问题，但是现在最紧迫的是，当我尝试使用预定义的输入（1、2、3）时，它会在打印正确的预定义值后出现段错误。这是我第一次尝试这样的跳跃，但我不确定自己做错了什么。任何帮助将非常感激！我在Linux Mint上编写，此代码仅适用于IA32。另外，asm_io来自我正在使用的教程。

; This(fibonacci):
; it(computes the kth fibonacci number)

; Set up io
%include "asm_io.inc"

; This puts initialized data into the .data segment
segment .data
; Let's get some data:
prompt1 db "Enter kth fibonacci you want to see: ", 0

outmsg1 db "The ", 0
outmsg2 db "th fibonacci number is: ", 0

f0: dd 0x1
f1: dd 0x2
f2: dd 0x2
f3: dd 0x3

; We will put uninitialized stuff in .bss
segment .bss

; Store the input
input1 resd 1


; Code gets put into .text
segment .text
    global asm_main
asm_main:
    ; i need to learn what these do
    enter 0,0
    ; it turns out this puts everything into the stack
    ; that exists before we begin
    pusha

    mov eax, prompt1
    call print_string
    call read_int
    mov [input1], eax


start:
    mov ecx, [input1]
    mov edx, [f0]
    mov ebx, [f1]
    mov eax, [f2]
    push eax
    mov eax, 0x1
    cmp ecx, eax
    je inputisone
    mov eax, 0x2
    cmp ecx, eax
    je inputistwo
    mov eax, 0x3
    cmp ecx, eax
    je inputisthree
    pop eax

fibloop:
    add ebx, edx
    mov edx, eax
    mov eax, ebx

    dec ecx
    cmp ecx, 3
    jne fibloop
quit:
    push eax
    jmp finish


inputisone:
    mov eax, [f0]
    push eax
    jmp finish

inputistwo:
    mov eax, [f0]
    push eax
    jmp finish

inputisthree:
    mov eax, [f2]
    push eax
    jmp finish


finish:
    ; Register dump
    dump_regs 1            ; Print register values
    dump_mem 2, outmsg1, 1 ; Print memory
    ; Now we can print the results.
    mov eax, outmsg1
    call print_string
    mov eax, [input1]
    call print_int
    mov eax, outmsg2
    call print_string
    pop eax
    call print_int
    call print_nl

    ; this returns everything from the stack that we placed there
    ; for safekeeping before we ran our program
    popa
    mov eax, 0
    leave
    ret               ; back to C!

谢谢您的帮助！