Date: Sat, 22 Dec 2001 22:37:55 -0800 (PST) From: Matthew Jacob <mjacob@feral.com> To: Bernd Walter <ticso@cicely9.cicely.de> Cc: Wilko Bulte <wkb@freebie.xs4all.nl>, freebsd-alpha@FreeBSD.ORG Subject: Re: FreeBSD 4.5 alpha buyglet Message-ID: <Pine.BSF.4.21.0112222233290.2338-100000@beppo> In-Reply-To: <20011223032201.GA61241@cicely9.cicely.de>
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On Sun, 23 Dec 2001, Bernd Walter wrote:
> On Sat, Dec 22, 2001 at 05:12:32PM -0800, Matthew Jacob wrote:
> >
> > >Yes, see Message-ID: <20011221175252.A25617@freebie.xs4all.nl>
> > >on -alpha.
> >
> > Ooops- so right you are. Anyway, I looked at this just a bit- seems a compiler
> > error to me- it shouldn't be generating ldq's for those tags because they
> > couldn't possibly be at 8 byte offsets given the structures involved. Oh well.
>
> The two variables it fails on are defined as beeing long but only 32 bit
> aligned. I'm more about beleaving the sysctl tranfer misaligns them. But I
> have currently no system where I see this problem so I can't be shure. The
> sysctl receive buffer is malloc'ed so it should be 64 bit aligned.
Hmm? I used gdb to find the misaligned reference to be, e.g.:
***> if (ifm->ifm_data.ifi_metric)
printf(" metric %ld", ifm->ifm_data.ifi_metric);
***> if (ifm->ifm_data.ifi_mtu)
printf(" mtu %ld", ifm->ifm_data.ifi_mtu);
putchar('\n');
struct if_msghdr {
u_short ifm_msglen; /* to skip over non-understood messages */
u_char ifm_version; /* future binary compatability */
u_char ifm_type; /* message type */
int ifm_addrs; /* like rtm_addrs */
int ifm_flags; /* value of if_flags */
u_short ifm_index; /* index for associated ifp */
offset: 14
struct if_data ifm_data;/* statistics and other data about if */
};
...
struct if_data {
/* generic interface information */
u_char ifi_type; /* ethernet, tokenring, etc */
u_char ifi_physical; /* e.g., AUI, Thinnet, 10base-T, etc
*/
u_char ifi_addrlen; /* media address length */
u_char ifi_hdrlen; /* media header length */
u_char ifi_recvquota; /* polling quota for receive intrs */
u_char ifi_xmitquota; /* polling quota for xmit intrs */
offset: 6
u_long ifi_mtu; /* maximum transmission unit */
u_long ifi_metric; /* routing metric (external only) */
u_long ifi_baudrate; /* linespeed */
So, if gdb was right and dereferencing ifi_mtu or ifi_metric is generating
a ldq, then the compiler seems to be broken.
-matt
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