[Linux-ia64] ptrace behavior accessing ar.lc and ar.ec

From: Weihaw Chuang <weihaw_at_yahoo.com>
Date: 2002-01-25 20:28:25
Hi folks,
I'm using the ptrace interface to create a
"architectural" processor state tracing tool.  When I
access AR.LC and AR.EC, I *usually* get the expected
result, but every once and a while it returns a bogus

Is there a known bug, or am I using ptrace

Here's how its used:
lc = ptrace (PTRACE_PEEKUSER, state->pid, PT_AR_LC,

The tracing program observes some sort of behavior

mov.i ar.lc = r61    (I'm pretty sure r61 is 6), and  
                       ptrace returns 0 
sxt4  r22=r60        ptrace returns -1
.....                "
(swp kernel code)    "
.....                "
br.ctop.sptk.few .b9 ptrace returns -1, br taken 
(p17) st8 [r15]=r34  ptrace returns 5

Many thanks,


Weihaw Chuang


Do You Yahoo!?
Great stuff seeking new owners in Yahoo! Auctions! 
Received on Fri Jan 25 01:28:28 2002

This archive was generated by hypermail 2.1.8 : 2005-08-02 09:20:07 EST