From: Weihaw Chuang <weihaw@yahoo.com>
To: linux-ia64@vger.kernel.org
Subject: [Linux-ia64] ptrace behavior accessing ar.lc and ar.ec
Date: Fri, 25 Jan 2002 09:28:25 +0000 [thread overview]
Message-ID: <marc-linux-ia64-105590698805929@msgid-missing> (raw)
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
result.
Is there a known bug, or am I using ptrace
incorrectly?
Here's how its used:
lc = ptrace (PTRACE_PEEKUSER, state->pid, PT_AR_LC,
0);
The tracing program observes some sort of behavior
like:
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,
-Wei
==************************************************************
Weihaw Chuang
wchuang@cs.ucsd.edu
************************************************************
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next reply other threads:[~2002-01-25 9:28 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-01-25 9:28 Weihaw Chuang [this message]
2002-01-25 16:30 ` [Linux-ia64] ptrace behavior accessing ar.lc and ar.ec David Mosberger
2002-01-25 20:01 ` David Mosberger
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