#asahi-re on 2021-02-10 — irc logs at oftc.irclog.whitequark.org

2021-01-11 09:52 marcan changed the topic of #asahi-re to: Asahi Linux: porting Linux to Apple Silicon macs | Hardware / boot process / firmware interface reverse engineering | WARNING: this channel (only) may contain binary reverse engineering discussion | RE policy: https://alx.sh/re (MANDATORY READ) | GitHub: https://alx.sh/g | Wiki: https://alx.sh/w | Logs: https://alx.sh/l/asahi-re

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15:00 <marcan> https://github.com/AsahiLinux/docs/wiki/HW:ARM-System-Registers-Dumps full vendor-specific register dump

15:14 <davidrysk[m]> marcan: is it possible to dump them after macOS has booted, e.g. using a kext?

15:14 <marcan> sure

15:14 <marcan> I don't know how to write kexts though :-) (yet)

15:14 <davidrysk[m]> also I assume that iBoot uses some of the Apple features like PAC

15:15 <davidrysk[m]> if you want to avoid xcode projects you can use https://github.com/droe/example.kext

15:16 <davidrysk[m]> if all you're doing is logging crap to the kernel log, you don't need to do that much

15:16 <davidrysk[m]> if you're writing drivers that have to interact with userspace it's more work :p

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15:36 <marcan> good point, though the problem is if you just log you need to reboot to load a new kext

15:36 <marcan> ideally you want it to be interactive :)

15:38 <sven> time for m1n1.kext? :-P

15:40 <jn__> kextec :P

15:56 <marcan> pushed the tool to m1n1.git, and also a register database of all actually documented ARM regs

15:57 <marcan> I need to clean up proxyclient/ some day...

16:42 <modwizcode> heh the best part of proxyclient is it's lack of documentation

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18:10 <davidrysk[m]> marcan: hm do you think DirectHW.kext would be of any use? :P

18:11 <davidrysk[m]> lemme find upstream, it's kinda buried

18:13 <davidrysk[m]> I think flashrom's version is the most current, but the closest thing to upstream is coreboot's repo

18:15 <modwizcode> marcan: can I get the same dump on a firestorm core?

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18:35 <davidrysk[m]> directhw is probably a good place to start, just rip out all the x86-specific code and use your own asm :)

18:38 <marcan> davidrysk[m]: IIRC there was something like that elsewhere too

18:38 <marcan> modwizcode: feel free to write the docs!

18:39 <marcan> going to sleep now, I'll get the firestorm stuff tomorrow

18:39 <davidrysk[m]> marcan: yeah, I believe it all traces back to the same code

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