ChanServ changed the topic of #asahi-dev to: Asahi Linux: porting Linux to Apple Silicon macs | Non-development talk: #asahi | General development | GitHub: https://alx.sh/g | Wiki: https://alx.sh/w | Logs: https://alx.sh/l/asahi-dev
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<nickchan>
appearently apple cpu part 0xa is Marin core
<nickchan>
aka T8015's ANS2 CPU Core
<nickchan>
hopefully i could bring up ans2 on t8015 based on hacking iboot's data abort handler
<nickchan>
but hacking those pages in the data abort handler itself causes iboot to fail to init ans2 so fun
<nickchan>
need to see if its timeout related because the same method of hacking data abort handler worked fine to see what iboot did to the dart
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<nickchan>
patch pte to invalid in shellcode -> try to access certain mmio -> data abort handler in shellcode -> recover pte in shellcode and tlbi -> emulate load/store -> break the pte again and tlbi -> continue iboot's execution
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<nickchan>
trying my best to reduce binary reverse enginnering!
<nickchan>
and sart seems simple enough that blind probing should do
<nickchan>
But might as well patch sart's pte in iboot's pagetables
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<nickchan>
load store emulator is wrong
<nickchan>
it did not handle xzr/wzr correctly
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<maz>
nickchan: let me guess: it used SP instead...
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<nickchan>
maz: correct
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<maz>
nickchan: funny that. we had the same bug in KVM, fixed in 2015. Qualcomm had it in their SMMU emulation code, never fixed. this architecture makes a point in making things difficult.
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<sven>
https://github.com/AsahiLinux/linux/tree/sven/smc-v4 shutdown works again now as well except for a strange macsmc-reboot macsmc-reboot: Failed to issue MBSE = offw (0x6f666677) (reboot_prepare) message
<sven>
let's see how i broke that
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