Re: [Qemu-devel] proposal: drop linux-user unicore32 support from QEMU

[Xuetao Guan]

> On Thu, Sep 22, 2016 at 11:09:55PM +0800, MPRC wrote:
>> Hi, I'm fixing the syscall problem for linux-user/unicore32 in qemu.
>>
>> I write a "hello world" program to test linux-user/unicore32 in qemu 2.7
>> with toolchain of uc4-1.0.5(you can download it through
>> http://mprc.pku.edu.cn/~guanxuetao/linux/uc4-1.0.5-hard.tgz). And it's
>> just OK.
>> It goes well in the old version qemu that we using, also.
>>
>> Can you discribe the bug more detailed? Or how do you find that the
>> unicore32 don't use the real syscall numbers?
>> How should test this? By Linux Test Project? It's not necessary to do
>> all test in LTP.
>
> The problem we see is that the system call numbers in qemus
> unicore32/syscall_nr.h dont match what is linux mainline kernel. From the
> toolchain linked, you seem to have kernel headers and syscall numbers
> based on a custom 2.6.32 fork. If one builds unicore32 binaries based on
> Linux 4.4 kernel headers, they will not work qemu. OTOH the binary built
> with the toolchain you linked, would not work with linux 4.4. This
> disparity is what we'd like to get fixed.
>
> Riku
>
OK, I see.
I'd send kernel-patches merge request to linus, but the patches hadn't be
merged.
I'll work on it. Hopefully it'll be done before mid Oct.

Thanks Riku and Peter

Guan Xuetao