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

[Richard Henderson]

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.


r~