书p3的几行简单代码问题

[happy.xhx]

问大家一个问题：

p3代码1.1中，第6行，已经是jmp $，即无限循环了，那么第17行、18行的代码：times 510-($-$$)   db "hello, os world!"

                                                                                                                    dw 0xaa55

，为什么还能够执行到呢？

[Yang Sigong]

db和times是伪指令，是汇编阶段指导nasm用的。通俗地说就是给二进制文件内部占位置的，不参与运行阶段

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[李重斌]

就是这个理

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[happy.xhx]

多谢l了！请问你是在nasm manual中了解到这些的吗？

在 2013-08-29 17:52:19，"Yang Sigong" <sigon...@gmail.com> 写道：

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[Yang Sigong]

nasm手册没多少，应该看一下；同时8086汇编基础也应该先学习或复习一遍