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Re: Weird issue loading kernel extension.

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Re: Weird issue loading kernel extension.

Subject: Re: Weird issue loading kernel extension.
From: Alexander Klyuev <email@hidden>
Date: Sat, 03 Sep 2011 23:39:54 -0400

Hi B.J.,

I suspected something like that but never thought this is because of LC_UUID. Will give it a try. This should definitely work. Thank you a lot.

Best regards,
Alex

----- Original Message ----- From: "B.J. Buchalter" <email@hidden> To: <email@hidden> Cc: "Alexander Klyuev" <email@hidden> Sent: Wednesday, August 31, 2011 10:09 PM Subject: Re: Weird issue loading kernel extension.

On Aug 31, 2011, at 8:06 PM, Alexander Klyuev wrote:

Hi ALL,
I got unexpected issue: my kernel extension doesn't get loaded on Mac OS X 10.4.11 PPC. kextload utility outputs the following:

sudo kextload -t -v 6 /System/Library/Extensions/MyDriver.kext > kextload.log
Password:
kld(): /System/Library/Extensions/MyDriver.kext/Contents/MacOS/MyDriver load command 2 unknown cmd field

kextload: kld_load_from_memory() failed for module /System/Library/Extensions/MyDriver.kext/Contents/MacOS/MyDriver

kextload: a link/load error occured for kernel extension /System/Library/Extensions/MyDriver.kext
load failed for extension /System/Library/Extensions/MyDriver.kext
(run kextload with -t for diagnostic output)
This is the error message (I don't include kextload.log file content because it doesn't shed light on the problem).

MyDriver.kext contains executables for 3 architectures: ppc, i386 and x86_64, however the issue occurs with PPC arch only.

It's built with Xcode 3.2.4 (or so) on SL 10.6.7 using SDK 10.4u (SDK 10.6 is for x86_64 arch only).

This is because the Mach-o file has the UUID field in and the PPC kernel on 10.4.x doesn't understand it. This is a result of using the linker included with the newer Xcodes.

You have to add the following build setting to the project for the ppc build:

OTHER_LDFLAGS = -Xlinker -no_uuid

That one stumped me for a while when I ran into it.

Best regards,

B.J. Buchalter
Metric Halo
http://www.mhlabs.com

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