Re: [PATCH v1 3/3] semihosting/arg-compat: fix up handling of SYS_HEAPINFO

[Peter Maydell]

On Fri, 5 Mar 2021 at 20:22, Keith Packard <keithp@keithp.com> wrote:
>
> Peter Maydell <peter.maydell@linaro.org> writes:
>
> > Also, you don't seem to have the correct "is the CPU in
> > 32-bit or 64-bit mode" test here: you cannot rely on target_ulong
> > being the right size, you must make a runtime check.
>
> Do you mean whether a dual aarch64/arm core is in arm or aarch64 mode,
> or whether an aarch64 is running a 32-bit ABI?

For semihosting for Arm what matters is "what state is the core
in at the point where it makes the semihosting SVC/HLT/etc insn?".

How does RISCV specify it?

thanks
-- PMM