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Date: Mon, 16 Dec 2013 18:09:00 -0800
From: Peter Grehan <grehan@freebsd.org>
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To: Neel Natu <neelnatu@gmail.com>
Subject: Re: break to debugger in bhyve
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> Works fine for me once I compile with the ALT_BREAK_TO_DEBUGGER config option.

  Also works without that, but the sysctl (or tunable) has to be set:

root@bhyve-b1:~ # sysctl debug.kdb.alt_break_to_debugger=1
debug.kdb.alt_break_to_debugger: 0 -> 1

  (issued the 3-char sequence CR ~ ctl-b)

root@bhyve-b1:~ # KDB: enter: Break to debugger
[ thread pid 11 tid 100003 ]
Stopped at      kdb_alt_break_internal+0x17f:   movq    $0,kdb_why
db>

later,

Peter.