On Mon, 20 May 2019 11:28:30 +0300 Nikolay Borisov <nborisov@xxxxxxxx> wrote: > On 20.05.19 г. 11:24 ч., Honglei Wang wrote: > > Hi Nikolay, > > > > I don't think we can do the s390 analysis just use the x86_64 crash > > utility directly. I'm not familiar with cross build, but seems this > > linkage might help: > > > > https://developer.ibm.com/linuxonpower/2017/07/06/analyzing-openpower-kernel-dump-information-laptop/ > > This is exactly which got me started into trying to understand what it > takes to analyse s390 on x86_64. . Hence I've referenced the function > which is supposed to verify that a particular combination of host and > target is supported. I'm now interested in understanding why s390 on > x86_64 is not supported. Heh, been there already... ;-) That's for many reasons. Bernhard Walle tried to make a crosscrash package many years ago. The necessary changes were quite intrusive, and Dave wrote clearly that this was unlikely to get merged any time soon. I still thought it was a good idea, so as a Hackweek project I started writing a tool that can automatically convert the crash utility to a cross-platform variant. The (abandoned) sources can be found at GitHub[1]. IIRC this work was based on crash-6.0.5, it most likely fails miserably with any other version. ;-) Anyway, the main issue is that crash does not read individual data fields using gdb primitives. Instead, it often reads a whole structure and then accesses the fields directly. There are also too many global variables, sometimes their type depends on the target, etc. etc. But if you're willing to open this can of worms and clean it up, I will do my best to support you. ;-) Petr T > > Honglei > > > > > > On 2019/5/20 15:18, Nikolay Borisov wrote: > >> Hello Dave, > >> > >> I'd like to better understand why s390-on-x86_64 analysis is not > >> supported e.g. respective pair in get_current_configuration is > >> missing? Is it due to the endianness mismatch ? gdb does support > >> setting the endianness of a target? Or are there other problems? > >> > >> -- > >> Crash-utility mailing list > >> Crash-utility@xxxxxxxxxx > >> https://www.redhat.com/mailman/listinfo/crash-utility > > > > -- > Crash-utility mailing list > Crash-utility@xxxxxxxxxx > https://www.redhat.com/mailman/listinfo/crash-utility
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