寄存器断点(Register Breakpoint) 这种断点往往需要CPU 能支持这功能。CPU 内部要有一个比较器，当所设定的CPU 的值 与之匹配时，仿真器就停下来。
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你也可以设置断点并检查特定内存地址或寄存器的内容。
You can also set breakpoints and examine the contents of specific memory locations and registers.
例如，每当遇到断点时，您可能希望能同时检查某个特殊变量、检查某些寄存器的内容并转储堆栈。
For example, whenever you hit a breakpoint, you might wish to simultaneously check a particular variable, check the contents of some registers, and dump the stack.
KDB是一个功能非常强大的工具，它允许进行几个操作，比如内存和寄存器修改、应用断点和堆栈跟踪。
KDB is a very powerful tool that allows several operations such as memory and register modification, applying breakpoints, and stack tracing.
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