On Fri, 20 Aug 1999, Greg Lehey wrote: > You can't control the execution of the kernel, you can just look at > the way things are. With the core dump, you at least have the > advantage that things won't change while you look at them; you can't > even do that with /dev/mem. The other alternative is remote serial > debugging, where you *can* influence the execution of the kernel, for > example by setting breakpoints. But remember that the kernel is > already running when you attach to it, so you don't say 'run', you say > 'c[ontinue]'.
Thanks for your response. I can not think of those points myself. However, on page 7 of the book "Panic! Unix system crash dump analysis", it says that a debugger named kadb in SunOS can load the real kernel during boot and treat the latter like a great, big, user program, stepping through its execution, examining and modifying values on the fly. It seems to me that FreeBSD does not have such a debugger. Maybe ddb can do so, but it works with assembly. -Zhihui To Unsubscribe: send mail to majord...@freebsd.org with "unsubscribe freebsd-hackers" in the body of the message
