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Re: Commit 597ce1723 (MIPS: Support for 64-bit FP with O32 binaries) cau

To: Guenter Roeck <>
Subject: Re: Commit 597ce1723 (MIPS: Support for 64-bit FP with O32 binaries) causing qemu hang with mips64 kernels
From: Huacai Chen <>
Date: Sat, 8 Feb 2014 11:57:52 +0800
Cc: Linux MIPS Mailing List <>, Paul Burton <>, Ralf Baechle <>, "" <>
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Maybe you can try this:

On Sat, Feb 8, 2014 at 11:39 AM, Guenter Roeck <> wrote:
> Hi all,
> in 3.14-rc1, my mips64 qemu test fails. The image boots and then hangs.
> Bisect points to commit 597ce1723 (MIPS: Support for 64-bit FP with O32
> binaries).
> Reverting this commit fixes the problem. Disabling MIPS_O32_FP64_SUPPORT
> in my test image does _not_ solve the problem. The qemu version does not
> seem
> to make a difference; I tested with qemu 1.6.0 and 1.7.0.
> Console log output is available in
> When the problem is seen, the emulation hangs as can be seen in the log,
> and the qemu process consumes 100% CPU until it is killed.
> qemu command line is
> qemu-system-mips64 -kernel vmlinux -M malta -hda
> core-image-minimal-qemumips64.ext3 \
> -vga cirrus -usb -usbdevice wacom-tablet -no-reboot -m 128 --append
> "root=/dev/hda \
> rw mem=128M console=ttyS0 console=tty" -nographic
> The same configuration works fine with earlier kernels. I'll be happy to
> provide
> the detailed configuration as well as the root file system for testing if
> needed.
> Obviously I have no idea if this is a problem with the patch or with qemu.
> If there is anything I can do to help tracking down the problem further,
> please let me know.
> Thanks,
> Guenter

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