问题描述
我试图用NASM汇编文件，但是它指向文件中的这一行:
I tried to assemble a file with NASM, but it pointed to this line in the file:
mov al, byte ptr es:[bx]
说:
error: comma, colon or end of line expected
我在此站点上找到了页面，说NASM没有不喜欢"ptr"这个词，如果我写的话会很高兴的:
I found a page on this site saying that NASM doesn't like the word "ptr" and it would be happy if I wrote:
mov al, byte es:[bx]
相反.所以我拿出"ptr"一词，NASM仍然不高兴.这是我遗漏"ptr"一词时NASM给我的:
instead. So I took out the word "ptr" and NASM is still not happy. Here is what NASM gives me when I leave out the word "ptr":
warning: register size specification ignored
和:
error: invalid combination of opcode and operands
这是一个陷阱22！不管我是否输入"ptr"一词，NASM都很生气.有人可以帮我吗?
It's a catch 22! NASM is angry whether or not I put in the word "ptr". Can anybody help me with this?
推荐答案
我明白了！如果我写的话，NASM很高兴:
I got it!NASM is happy if I write:
mov al,byte [es:bx]
就像盖伊·西顿(Guy Sirton)说的那样.如果我在指令中遗漏了字节"一词，将会发生这种情况.如果指令是这样的:
like Guy Sirton said. If I leave out the word "byte" from the instruction, here is what would happen. If the instruction is one like this:
mov al, [es:bx]
NASM可以看到我要移动一个字节，因为我将其存储在al中，所以不会抱怨.但是，如果指令是这样的:
where NASM can see that I want to move one byte, since I'm storing it in al, it won't complain. But, if the instruction is one like this:
mov [es:bx],0xff
NASM无法看到我要在其中存储0xff的内存的地方，它会给您这样的错误:
where NASM can't see how much memory I want to store 0xff in, it will give you such an error:
error: operation size not specified
重要的是要知道，尤其是如果您使用的是此教程，NASM不会使用常规方法.
It's important to know, especially if you are using this tutorial, that NASM won't except the regular way.
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