将 BYTE 移动到 BYTE

Question

我在学习机器体系结构和汇编语言 class，我应该创建一个 MASM 程序来创建斐波那契数列直到用户定义的数字，该数字介于 1 和 46 之间。当我尝试将存储在标记为 buffer 的 BYTE 中的字符串传输到另一个标记为 user 的 BYTE 中，这是本书作者 ReadString 过程存储字符串的地方，我收到此构建输出：

1>------ Build started: Project: MASM2, Configuration: Debug Win32 ------
1>  Assembling fibonacci.asm...
1>fibonacci.asm(39): error A2070: invalid instruction operands
1>C:\Program Files (x86)\MSBuild\Microsoft.Cpp\v4.0\V140\BuildCustomizations\masm.targets(50,5): error MSB3721: The command "ml.exe /c /nologo /Sg /Zi /Fo"Debug\fibonacci.obj" /Fl"MASM2.lst" /I "c:\Irvine" /W3 /errorReport:prompt  /Tafibonacci.asm" exited with code 1.
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

我不确定为什么我不能将相同大小的对象移动到彼此中。我注释掉了用户部分并打印了缓冲区，它正确地将输入存储为字符串。非常感谢任何帮助。

***注意：我们使用的是 Assembly Language for the x86 Processor，第 7 版。由 Kip Irvine 编写，并使用他的 Irvine32 库。

; Calculate Fibonacci to the nth degree

INCLUDE Irvine32.inc

.data
buffer BYTE 21 DUP(0)
welcome BYTE "Welcome to Fibonacci! My name is Zach, I will be your programmer today!", 0
question BYTE "What is your name?: ", 0
greet BYTE "Hello, ", 0

user BYTE ?

prompt BYTE "Enter a number from 1 to 46: ", 0
debrief BYTE "GoodBye"

input SDWORD ?

fib DWORD ?

.code
main proc

     call Clrscr

     ;Print Welcome Screen
     mov edx,OFFSET welcome
     call WriteString
     call Crlf


     ;Get Username and Greet
     mov edx,OFFSET question
     call WriteString
     call Crlf

     mov edx,OFFSET buffer
     mov ecx,SIZEOF buffer
     call ReadString
     mov user, buffer

     mov edx,OFFSET greet
     call WriteString
     mov edx,OFFSET buffer
     call WriteString
     call Crlf


    ;Get Input-- 1 to 46

     mov edx,OFFSET prompt
     call WriteString

     call ReadInt
     mov input,eax


     ;Validate n

     ;Calculate-5 terms per line w/5 spaces between
     mov ecx,input
     mov al, ','
     mov eax,1
     call WriteDec

     start:
     call WriteChar
     call WriteDec
     mov fib, eax
     add eax,fib
     LOOP start

     ;Debrief
     call Crlf
     mov edx,OFFSET debrief
     call WriteString
    invoke ExitProcess,0
main endp
end main

有趣的新输出：

1>------ Build started: Project: MASM2, Configuration: Debug Win32 ------
1>  Assembling fibonacci.asm...
1>fibonacci.asm(44): error A2022: instruction operands must be the same size
1>fibonacci.asm(45): error A2022: instruction operands must be the same size
1>C:\Program Files (x86)\MSBuild\Microsoft.Cpp\v4.0\V140\BuildCustomizations\masm.targets(50,5): error MSB3721: The command "ml.exe /c /nologo /Sg /Zi /Fo"Debug\fibonacci.obj" /Fl"MASM2.lst" /I "c:\Irvine" /W3 /errorReport:prompt  /Tafibonacci.asm" exited with code 1.
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

Answer 1

我更改了代码，让 ReadString 直接进入 User，输出是正确的。

 ;Get Username and Greet
 mov edx,OFFSET question
 call WriteString
 call Crlf

 mov edx,OFFSET user
 mov ecx,SIZEOF user
 call ReadString

 mov edx,OFFSET greet
 call WriteString
 mov edx,OFFSET user
 call WriteString
 call Crlf

将 BYTE 移动到 BYTE

Moving a BYTE to a BYTE

assembly

masm

visual-studio

visual-studio-2015

irvine32