On Tue, 11 Dec 2007, �ս� TaoJie wrote:
Dear all:
In DTrace, when a fbt probe is activated, its related point (instruction)
would be replaced with "int $3"(opcode: cc).
I refer to "Intel Architecuture Manual" and "Solaris Internals (2nd)", and
find out that "int $3" is used for breakpoint.
Then, when "int $3" is executed, what would happen? I mean, how does the
kernel handle it?
Try:
idt0::array | ::gate_desc
from within "mdb -k" and follow up the flow of code from there, starting
at entry number three.
And... any recommended related articles?
There's that one:
http://www.opensolaris.org/os/project/czosug/events_archive/czosug2_dtrace_x86.pdf
Check that as a starting point, gives you some ideas how to look into
this.
Caveat: That's two years old. The implementation details (how the trap
dispatches into dtrace) might've changed a bit. The strategy for "how to
dtrace dtrace" has not.
In the source code, what are the related functions and what are the
related source files?
See above.
FrankH.
TIA!
Kind Regards,
TJ
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