Date: Tue, 15 Aug 2006 10:43:08 +0300 From: Kostik Belousov <kostikbel@gmail.com> To: Stanislav Sedov <ssedov@mbsd.msk.ru> Cc: freebsd-hackers@freebsd.org, John-Mark Gurney <gurney_j@resnet.uoregon.edu> Subject: Re: exception handling in kernel code Message-ID: <20060815074308.GN25753@deviant.kiev.zoral.com.ua> In-Reply-To: <20060814231223.3c7f1930@localhost> References: <20060814124658.1d416cbe@localhost> <200608140932.57875.jhb@freebsd.org> <20060814194729.436fc453@localhost> <20060814181521.GQ99774@funkthat.com> <20060814231223.3c7f1930@localhost>
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--3rMDlCEgcaHQQFB+ Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Mon, Aug 14, 2006 at 11:12:23PM +0600, Stanislav Sedov wrote: > On Mon, 14 Aug 2006 11:15:22 -0700 > John-Mark Gurney <gurney_j@resnet.uoregon.edu> mentioned: > >=20 > > You should make a MD API for reading these out (if one doesn't already > > exist) that handle the faulting for you, and then have your driver hook > > into this api... > >=20 > > I had to do something similar for accessing PCI config registers > > that don't exist and cause a fault... > > > =20 > Do you know some examples to look at? The problem is that i can't make > modifications in trap.c or anywhere else in src tree as such driver > isn't likely to become a part of FreeBSD kernel. Hmm, I think that jhb@ somewhat misguided your. For kernel-mode faults on i386, GPF and Segment not Present faults both results in calling of pcb_onfault handler. This is true for both STABLE and CURRENT. And this is true for amd64 as well. Look at the code at the <arch>/<arch>/trap.c, for arch in i386, amd64. --3rMDlCEgcaHQQFB+ Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.5 (FreeBSD) iD8DBQFE4XsLC3+MBN1Mb4gRAmWOAJ0fpyVyGPaOVIfh+Pa0BC0JoaieXwCgiOB1 5EOq4yCIeWhmYoydu5LgqeQ= =T3aO -----END PGP SIGNATURE----- --3rMDlCEgcaHQQFB+--
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