From: Andrew Cagney <cagney@gnu.org>
To: Orjan Friberg <orjan.friberg@axis.com>
Cc: gdb-patches@sources.redhat.com
Subject: Re: Z packet support in Gdbserver?
Date: Tue, 25 May 2004 18:03:00 -0000 [thread overview]
Message-ID: <40B38A5F.8050001@gnu.org> (raw)
In-Reply-To: <40B3650C.5090800@axis.com>
I noticed there's no support for z/Z packets for hardware watchpoints in the gdbserver. (I searched the archives for this, but came up empty-handed.) I'd guess that (from looking at ptrace.c for i386, where it accesses the DR_ registers) that the Gdbserver gets to configure the hardware breakpoint mechanism through ptrace (PTRACE_POKEUSR, ...). But how does it get there in the first place, if not as a result of a z/Z packet? Through direct register writes (G packet)?
Yep.
There are two ways to implement h/w watchpoints: in the target (as was
done for remote.c); or in the per-architecture code (as was done for
native i386). Both are correct. The missing bit is code to get the
per-architecture logic working with a remote target - this would involve
juggling things so that the h/w watchpoint registers are included in the
regcache and the target/arch to select either a local/remote mechanism.
More notes:
http://sources.redhat.com/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gdb&pr=735
Andrew
next prev parent reply other threads:[~2004-05-25 18:03 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <40B3650C.5090800@axis.com>
2004-05-25 15:27 ` Daniel Jacobowitz
2004-05-26 8:05 ` Orjan Friberg
2004-05-25 18:03 ` Andrew Cagney [this message]
2004-05-26 11:10 ` Orjan Friberg
2004-05-26 17:32 ` Andrew Cagney
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