Rob,

Am 23.09.2014 16:58, schrieb Rob Landley:
> As long as somebody's paying attention to UML again: what would be
> involved in adding support for arm/mips/sh4/sparc...
> 
> I've mostly wandered off to use qemu these days, and I package system
> images with native compilers you can boot up and compile software in:
> 
> http://landley.net/aboriginal/bin/
> 
> (Grab a system-image-$ARCH.tar.bz2 and ./run-emulator.sh in that, or
> ./dev-environment.sh if you want it to truncate and ext2 format a
> scratch space block device and and mount it on /home in the emulated
> system so you have persistent storage.)
> 
> I'm under the impression that user mode linux would need some glue code
> to run on powerpc, but dunno what it would actually be...

Supporting non-x86 archs needs more than just some glue code.
First the target arch would need support for changing syscall numbers with 
ptrace(),
or even better PTRACE_SYSEMU support. UML also depends on mcontext of SIGSEGV to
get the faulting address.
On ARM for example VIVT caches could be a problem too.
Al has all the glory details...

Thanks,
//richard

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