Announce: kdb v4.4 for x86-64 architecture

[Jim Houston]

Hi Jack,

I was very pleased to see your announcement of kdb for 
x86-64.

I found a bug in the debug trap handling used for single
step. In particular, in do_debug() when kdb has handled the
single step, it needs a "return regs;" rather than "return 0;". 
The debug entry in entry.S sets %rsp to this returned value
and uses it to restore the registers.  Since %rsp is zero,
you get a double fault.

Jim Houston - Concurrent Computer Corp.


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