Re: Semihosting, arm, riscv, ppc and common code

[Richard Henderson]

On 1/15/20 2:01 AM, Alex Bennée wrote:
> Hmm, I'm not so sure. QEMU tries to emulate real HW although I
> appreciate that is a somewhat loose definition once you get to things
> like -M virt and other such SW like abstractions. Is semihosting even
> going to be a thing on real RiscV/Power silicon?

For risc-v, the odd nop-full semi-hosting call sequence was chosen to work with
jtag debuggers on real silicon.

As for the rest of the abi, the stuff after the debugger/emulator has gotten
control, they did have the opportunity to do better, and did not.


r~