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Re: [Qemu-devel] [Qemu-ppc] [PATCH for-3.1 0/7] target/ppc fp cleanups
From: |
Programmingkid |
Subject: |
Re: [Qemu-devel] [Qemu-ppc] [PATCH for-3.1 0/7] target/ppc fp cleanups |
Date: |
Thu, 5 Jul 2018 09:59:56 -0400 |
> Hi,
>
> qemu-system-ppc has an issue after building from the 3.1 branch. Mac
> OS 9 hangs at the grey boot screen, OSX 10.3 hangs after verbose boot,
> just before entering the graphical desktop.
>
> Command line to reproduce:
>
> qemu-system-ppc -L pc-bios -boot c -M mac99,via=pmu -m 512 -prom-env
> 'auto-boot?=true' -prom-env 'boot-args=-v' -prom-env 'vga-ndrv?=true'
> -drive file=MacOS9.2.img,format=raw,media=disk -netdev
> user,id=network01 -device sungem,netdev=network01
>
> I bisected to this commit:
>
> cdee6bed3e2ed60f039fb84f63c5dc5f4af4619c is the first bad commit
> commit cdee6bed3e2ed60f039fb84f63c5dc5f4af4619c
> Author: Richard Henderson <address@hidden>
> Date: Tue Jul 3 08:17:32 2018 -0700
>
> target/ppc: Use non-arithmetic conversions for fp load/store
>
> Memory operations have no side effects on fp state.
> The use of a "real" conversions between float64 and float32
> would raise exceptions for SNaN and out-of-range inputs.
>
> Signed-off-by: Richard Henderson <address@hidden>
> Signed-off-by: David Gibson <address@hidden>
>
> :040000 040000 d61b35b777c3ac2f28980a98fc83b8dfdce11bba
> ec7c15afcef93cc469c5ee0a2bfda293ba745dc3 M target
>
> Thanks for looking into it.
>
> Best regards,
> Howard
I also noticed that my Mac OS 10.4.3 VM stopped booting. When I reversed the
above patch the VM started booting again. I am CC'ing Richard Henderson on this
issue.