Re: [RFC PATCH 0/6] Port PPC64/PowerNV MMU tests to QEMU

[Cédric Le Goater]

On 3/26/22 14:13, Richard Henderson wrote:
> On 3/24/22 13:08, Leandro Lupori wrote:
> > To be able to finish the test and return an exit code to the
> > calling process, the Processor Attention instruction is used.
> > As its behavior is implementation dependent, in QEMU PowerNV
> > it just calls exit with GPR[3] value, truncated to an uint8_t.
>
> I think you're simply thinking too small here, and should consider using the 
> attn instruction to implement a full -semihosting interface.  You might as well 
> join arm and riscv with CONFIG_ARM_COMPATIBLE_SEMIHOSTING.

yes. This looks like a good interface. We need an instruction
to generate the semihosting calls.

Thanks,

C.