Re: [Qemu-devel] Provide safe_syscall for s390x

[Christian Borntraeger]

On 10/17/2016 10:26 AM, Thomas Huth wrote:
> On 14.10.2016 20:58, Michael Tokarev wrote:
>> Hi.
>>
>> This commit: c9bc3437a905b660561a26cd4ecc64579843267b
>> Author: Richard Henderson <address@hidden>
>> Date:   Tue Jun 21 17:32:12 2016 -0700
>>
>>     linux-user: Provide safe_syscall for s390x
>>
>> does not build on debian unstable porterbox for s390x, with
>> the following error message:
>>
>> linux-user/host/s390x/safe-syscall.inc.S: Assembler messages:
>> linux-user/host/s390x/safe-syscall.inc.S:75: Error: Unrecognized opcode:
>> `lt'
>> rules.mak:72: recipe for target 'linux-user/safe-syscall.o' failed
>>
>> Since I know nothing about s390, I've no idea what's at fault
>> here... :)  Thought I'd report this :)
> 
> "lt" seems to be a newer s390x opcode which has been added to the
> architecture within the last ten years or so. So maybe you've got to add
> some "-march=xxx" flag when compiling this file?
> Could you maybe start with finding out the exact comand line that is
> used to compile this file?

Yes, lt was added with the extended immidiate facility. So either use 
-march=z9-109 (introduced in
2005) or replace the lt with an l + ltr to also run on older models.