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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<kettenis>
Seems I have a workable way to build m1n1 with rust code enabled using "-Z build-std=alloc,core"
<kettenis>
would that be a useful feature for other OSes or distros?
<kettenis>
I'd still like to verify that the binaries work before we commit to having rust in the stage 2 m1n1
<kettenis>
will do so later this week
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<chadmed>
kettenis: m1n1 with softfloat rust works fine without extra flags on gentoo so im not certain
<chadmed>
would it help if we taught the hv how to save/restore fp regs and got rid of the softfloat thing?
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<jannau>
I'd say using "-Z build-std" is kind of justified for our use case if we can't rely on a prebuilt softfloat toolchain. stabilization is a goal for 2025H1 to support Rust for Linux: https://github.com/rust-lang/rust-project-goals/issues/116
<jannau>
I don't think we want to touch the FP/SIMD registers on HV context switches
<kettenis>
chadmed: I'm not changing RUSTARCH; that's still aarch64-unknown-none-softfloat
<kettenis>
the -Z build-std is purely to work around the lack of rustup support for OpenBSD
<chadmed>
kettenis: yeah, my question was more assessing whether or not us just not using softfloat at all would help, but if we dont want to touch the fp regs at all on context switches then its not an option
<kettenis>
it turns out that the OpenBSD rustc already supports aarch64-unknown-none-softfloat
<chadmed>
this will also be a bit annoying for gentoo tbh since everyones going to need the softfloat target built/installed
<kettenis>
so the only missing bit really is just std lib support
<kettenis>
you don't really need the full rustup toolchain
<kettenis>
but of course -Z build-std does need the rust-src component
<kettenis>
but we already package that for OpenBSD
<chadmed>
so do we, that might be enough then
<chadmed>
if build-std is stabilised then we should be all clear
<kettenis>
so sounds that this way of building is potentially useful for others too
<kettenis>
I'll see if I can prepare a pull request
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<nickchan>
I think I will send i2c, spmi noeds and continue to resend cpu pmu support for the older socs in during the next cycle https://github.com/HoolockLinux/linux b4/apple-cpmu b4/i2c-no-t2 b4/t8015-spmi
<nickchan>
downstream patch load is now 96 (111 for 6.14)
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<nickchan>
nothing compared to the amount of patches in asahi linux though
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<sven>
getting some tested-bys,etc. for the pmu support might be more helpful than trying to resend it again and again
<sven>
would show that there’s interest in that series
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<jannau>
shall we plan for a m1n1 release? I think a release before the chickens refactoring and the agx initdata would be good idea
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<jannau>
right, I wanted to try if that happens with clang on linux
<sven>
I still have no clue how that happens. I looked for all instrs that follow a register load of 0x20.. and could write it but none made sense
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<jannau>
the crash did not reproduce on t6020
<jannau>
linux clang-built m1n1 crashes as well
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<sven>
the difference between gcc and clang was that clang had that additional function call inside mmu_setup_secondary while gcc inline that function instead iirc
<sven>
so we may still corrupt the stack but just not notice
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<jannau>
`__asm__ volatile("ldr x11, [sp, #8]" : : : "r11");` after `msr(PAN, 0);` fixes it for me. only difference in the binary is that that meaning instruction is inserted
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