Re: [Qemu-devel] [Bug 1815024] [NEW] SIGILL on instruction "stck" under qemu-s390x in user mode

[Richard Henderson]

On 2/7/19 12:01 PM, Thomas Huth wrote:
> On 2019-02-07 12:46, Giovanni Mascellani wrote:
>> Hi,
>>
>> Il 07/02/19 12:26, Thomas Huth ha scritto:
>>> The problem is rather that the STCK instruction is fenced with
>>> "#ifndef CONFIG_USER_ONLY" ... quick-n-dirty hack to allow it:
>>
>> Thanks for the patch. Unfortunately on my system it failes with:
>>
>>   LINK    s390x-linux-user/qemu-s390x
>> /usr/bin/ld: ../libqemuutil.a(cpu-get-icount.o):(.bss+0x0): multiple
>> definition of `use_icount'; exec.o:(.bss+0x58): first defined here
>> collect2: error: ld returned 1 exit status
>> make[1]: *** [Makefile:207: qemu-s390x] Error 1
>> make: *** [Makefile:432: subdir-s390x-linux-user] Error 2
>>
>> The error does not appear when compiling from current master.
> 
> I just saw it, too. Seems like the stubs/cpu-get-icount.c file now gets
> pulled in for some reason. Try this on top:
> 
> diff --git a/stubs/cpu-get-icount.c b/stubs/cpu-get-icount.c
> index 35f0c1e..8da6646 100644
> --- a/stubs/cpu-get-icount.c
> +++ b/stubs/cpu-get-icount.c
> @@ -4,7 +4,7 @@
>  #include "sysemu/cpus.h"
>  #include "qemu/main-loop.h"
> 
> -int use_icount;
> +int use_icount __attribute__((weak));
> 
>  int64_t cpu_get_icount(void)
>  {
> 
> ... anyway, I'll ponder about that a little bit and will try to come up
> with a proper, mergable patch instead.

See also

  https://lists.gnu.org/archive/html/qemu-devel/2018-11/msg06734.html

which I never followed up on the review changes requested.


r~