dtrace discuss - Apr 2007 - writing a new trap handler

Hi,

I looked at the pid provider''s trap handler code
(usr/src/uts/sun4u/ml/trap_table.s and
usr/src/uts/sun4/os/dtrace_subr.c), and try to understand how it works.
Can someone point me some directions about trap handlers? I am interesed
in writing a new one (like dtrace does it in pid provider with the 0x38
trap id). At first, I would be pleased if I could write a trap handler
which just enters kernel mode, does nothing, than returns to userspace
(I would use some unused trap identifier, for example 0x39).

Peter

On Thu, Apr 12, 2007 at 03:36:05PM +0200, Peter Boros
wrote:
> I looked at the pid provider''s trap handler code
> (usr/src/uts/sun4u/ml/trap_table.s and
> usr/src/uts/sun4/os/dtrace_subr.c), and try to understand how it works.
> Can someone point me some directions about trap handlers? I am interesed
> in writing a new one (like dtrace does it in pid provider with the 0x38
> trap id). At first, I would be pleased if I could write a trap handler
> which just enters kernel mode, does nothing, than returns to userspace
> (I would use some unused trap identifier, for example 0x39).
Hey Peter,

There''s really not much by way of documentation beyond the code itself.
I suggest you take a look at some other traps that are doing what you
want. Out of curiosity, what are you planning on implementing?

Adam

-- 
Adam Leventhal, Solaris Kernel Development       http://blogs.sun.com/ahl