dtrace discuss - Aug 2008 - 64-bit return values with fbt provider on 32-bit kernel

Is there any way to access the full 64-bit "long long" return value
from the return probe of the fbt provider, when running on the 32-bit
Solaris x86 kernel?

E.g. how do I get access at the full 64-bit hrtime_t result
from the kernel''s gethrtime() function?

# isainfo -kv
32-bit i386 kernel modules
# dtrace -n ''fbt::gethrtime:return { printf("%llx", args[1]);
}''
... prints lots of 32-bit values; the high order 32-bits from hrtime_t are lost
...


And it seems that a similar problem exists for 64-bit arguments
and the entry probe; but in this case I can work around the problem
by assembling the full 64-bit argument from two raw argN  argN+1
values:

This works:
# dtrace -n ''fbt::new_cpu_mstate:entry { printf("%llx", (arg2
<< 32) | arg1); }''

But this doesn''t:
# dtrace -n ''fbt::new_cpu_mstate:entry { printf("%llx",
args[1]); }''


--
This message posted from opensolaris.org

> 
> But this doesn''t:
> # dtrace -n ''fbt::new_cpu_mstate:entry { printf("%llx",
args[1]); }''
> 
void new_cpu_mstate(int cmstate, hrtime_t curtime)

Try ((arg1 << 32) | arg2), the way this function would
receive curtime in the parameter. Sorry, I didn''t verify it.

-- Bhaskar