ios - osx 上的 ‘I Space’ 和 ‘D Space’ 是什么以及它们之间的区别

Question

在 sys/ptrace.h 中，我看到类似这样的内容:

@define PT_READ_I  1 /* read world in child's I space*/
@define PT_READ_D  2 /* read world in child's D space*/
@define PT_READ_U  3 /* read world in child's user structure*/

什么是“I Space”和“D Space”以及“用户结构”？

Answer 1

引用手册页:

Traditionally, ptrace() has allowed for machines with distinct address spaces for instruction and data, which is why there are two requests: conceptually, PT_READ_I reads from the instruction space and PT_READ_D reads from the data space. In the current NetBSD implementation, these two requests are completely identical.

现在关于 PT_READ_U:

This space contains the registers and other information about the process; its layout corresponds to the user structure in the system.