1*c54f35caSApple OSS DistributionsThis directory contains a universal DEBUG kernel, built for 32-bit and 2*c54f35caSApple OSS Distributions64-bit Intel. It includes a dSYM bundle for remote kernel debugging 3*c54f35caSApple OSS Distributionsand live kernel debugging. 4*c54f35caSApple OSS Distributions 5*c54f35caSApple OSS DistributionsINSTALLATION 6*c54f35caSApple OSS Distributions 7*c54f35caSApple OSS Distributions!!!WARNING!!! These steps will overwrite the default kernel and 8*c54f35caSApple OSS DistributionsSystem.kext. Backup all files before attempting these steps. 9*c54f35caSApple OSS Distributions 10*c54f35caSApple OSS DistributionsTo install the DEBUG kernel, do: 11*c54f35caSApple OSS Distributionsbash-3.2$ sudo -s 12*c54f35caSApple OSS Distributionsbash-3.2# cd / 13*c54f35caSApple OSS Distributionsbash-3.2# ditto /AppleInternal/Developer/Extras/Kernel\ Debugging/System.kext /System/Library/Extensions/System.kext 14*c54f35caSApple OSS Distributionsbash-3.2# cp -r /AppleInternal/Developer/Extras/Kernel\ Debugging/mach_kernel* / 15*c54f35caSApple OSS Distributionsbash-3.2# chown -R root:wheel /System/Library/Extensions/System.kext /mach_kernel* 16*c54f35caSApple OSS Distributionsbash-3.2# chmod -R g-w /System/Library/Extensions/System.kext /mach_kernel* 17*c54f35caSApple OSS Distributionsbash-3.2# touch /System/Library/Extensions 18*c54f35caSApple OSS Distributionsbash-3.2# shutdown -r now 19*c54f35caSApple OSS Distributions 20*c54f35caSApple OSS DistributionsREMOTE KERNEL DEBUGGING 21*c54f35caSApple OSS Distributions 22*c54f35caSApple OSS DistributionsSee the documentation that accompanies the Kernel Debug Kit 23*c54f35caSApple OSS Distributions 24*c54f35caSApple OSS DistributionsLIVE KERNEL DEBUGGING 25*c54f35caSApple OSS Distributions 26*c54f35caSApple OSS DistributionsWith the DEBUG kernel installed, set "kmem=1" in your "boot-args" 27*c54f35caSApple OSS DistributionsNVRAM variable, reboot, and do: 28*c54f35caSApple OSS Distributions 29*c54f35caSApple OSS Distributionsbash-3.2$ sudo gdb -a <arch> --quiet /mach_kernel 30*c54f35caSApple OSS Distributions(gdb) target darwin-kernel 31*c54f35caSApple OSS Distributions(gdb) source /AppleInternal/Developer/Extras/Kernel\ Debugging/kgmacros 32*c54f35caSApple OSS DistributionsLoading Kernel GDB Macros package. Type "help kgm" for more info. 33*c54f35caSApple OSS Distributions(gdb) attach 34*c54f35caSApple OSS DistributionsConnected. 35*c54f35caSApple OSS Distributions 36*c54f35caSApple OSS Distributions<arch> should reflect the currently booted kernel architecture, either 37*c54f35caSApple OSS Distributions"i386" or "x86_64" 38*c54f35caSApple OSS Distributions 39*c54f35caSApple OSS Distributions 40