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From: ebiederm@xmission.com (Eric W. Biederman)
To: <fastboot@osdl.org>
Cc: Jan Kratochvil <lace@jankratochvil.net>,
	Magnus Damm <magnus.damm@gmail.com>, Horms <horms@verge.net.au>,
	Vivek Goyal <vgoyal@in.ibm.com>, Linda Wang <lwang@redhat.com>,
	<linux-kernel@vger.kernel.org>, "H. Peter Anvin" <hpa@zytor.com>
Subject: [CFT] ELF Relocatable x86 and x86_64 bzImages
Date: Mon, 31 Jul 2006 10:19:04 -0600	[thread overview]
Message-ID: <m1u04x4uiv.fsf_-_@ebiederm.dsl.xmission.com> (raw)
In-Reply-To: <m1d5c92yv4.fsf@ebiederm.dsl.xmission.com> (Eric W. Biederman's message of "Thu, 13 Jul 2006 11:33:51 -0600")


I have spent some time and have gotten my relocatable kernel patches
working against the latest kernels.  I intend to push this upstream
shortly.

Could all of the people who care take a look and test this out
to make certain that it doesn't just work on my test box?

My approach is to extend bzImage so that it is an ET_DYN ELF executable
(we have what used to be a bootsector where we can put the header).
Boot loaders are explicitly not expected to process relocations.

The x86_64 kernel is simply built to live at a fixed virtual address
and the boot page tables are relocated.  The i386 kernel is built
to process relocates generated with --embedded-relocs (after vmlinux.lds.S)
has been fixed up to sort out static and dynamic relocations.

Currently there are 33 patches in my tree to do this.

The weirdest symptom I have had so far is that page faults did not
trigger the early exception handler on x86_64 (instead I got a reboot).

The code should be available shortly at:
git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/linux-2.6-reloc.git#reloc-v2.6.18-rc3

If all goes well with the testing I will push the patches to Andrew in the next couple 
of days.

Eric

       reply	other threads:[~2006-07-31 16:20 UTC|newest]

Thread overview: 46+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <aec7e5c30606300145p441d8d0xd89fab5e87de5a22@mail.gmail.com>
     [not found] ` <20060705222448.GC992@in.ibm.com>
     [not found]   ` <aec7e5c30607051932r49bbcc7eh2c190daa06859dcc@mail.gmail.com>
     [not found]     ` <20060706081520.GB28225@host0.dyn.jankratochvil.net>
     [not found]       ` <aec7e5c30607070147g657d2624qa93a145dd4515484@mail.gmail.com>
     [not found]         ` <20060707133518.GA15810@in.ibm.com>
     [not found]           ` <20060707143519.GB13097@host0.dyn.jankratochvil.net>
     [not found]             ` <20060710233219.GF16215@in.ibm.com>
     [not found]               ` <20060711010815.GB1021@host0.dyn.jankratochvil.net>
     [not found]                 ` <m1d5c92yv4.fsf@ebiederm.dsl.xmission.com>
2006-07-31 16:19                   ` Eric W. Biederman [this message]
2006-07-31 20:25                     ` [CFT] ELF Relocatable x86 and x86_64 bzImages Vivek Goyal
2006-07-31 21:00                       ` [Fastboot] " Vivek Goyal
2006-08-01  2:31                         ` Eric W. Biederman
2006-08-01  2:34                           ` H. Peter Anvin
2006-08-01  3:44                             ` Eric W. Biederman
2006-08-01  4:25                           ` Jan Kratochvil
2006-08-01  9:09                             ` Eric W. Biederman
2006-08-01  9:43                               ` Jan Kratochvil
2006-08-01 11:28                                 ` Eric W. Biederman
2006-08-04 21:08                     ` Don Zickus
2006-08-04 21:25                       ` Eric W. Biederman
2006-08-04 23:43                         ` Don Zickus
2006-08-05  7:49                           ` Eric W. Biederman
2006-08-05 16:07                           ` Eric W. Biederman
2006-08-07 17:44                             ` Don Zickus
2006-08-07 18:08                               ` Eric W. Biederman
2006-08-07 23:57                                 ` Don Zickus
2006-08-08  5:01                                   ` Eric W. Biederman
2006-08-08 19:36                                     ` Don Zickus
2006-08-09 20:06                                     ` Don Zickus
2006-08-10  6:09                                       ` Eric W. Biederman
2006-08-10 13:13                                         ` Vivek Goyal
2006-08-10 17:05                                           ` Eric W. Biederman
2006-08-10 18:18                                             ` Vivek Goyal
2006-08-10 20:09                                               ` Eric W. Biederman
2006-08-11 21:25                                                 ` Don Zickus
2006-08-12  7:20                                                   ` Eric W. Biederman
2006-08-12 15:25                                                     ` Don Zickus
2006-08-12 19:41                                                       ` Eric W. Biederman
2006-08-13 20:06                                                     ` Andi Kleen
2006-08-13 21:44                                                       ` Eric W. Biederman
2006-08-14 16:51                                                 ` [Fastboot] " Vivek Goyal
2006-08-14 17:04                                                   ` H. Peter Anvin
2006-08-14 18:11                                                     ` Vivek Goyal
2006-08-14 19:32                                                       ` H. Peter Anvin
2006-08-14 19:42                                                         ` Vivek Goyal
2006-08-14 19:45                                                           ` H. Peter Anvin
2006-08-14 19:57                                                             ` Vivek Goyal
2006-08-14 20:10                                                             ` Eric W. Biederman
2006-08-14 20:59                                                               ` Vivek Goyal
2006-08-14 21:15                                                                 ` Eric W. Biederman
2006-08-14 20:00                                                     ` Eric W. Biederman
2006-08-08 23:36                                   ` Andi Kleen
2006-08-25 20:16                     ` Vivek Goyal
2006-08-25 20:16                       ` Vivek Goyal

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