Re: [PATCH] Semihost SYS_READC implementation (v4)

[Peter Maydell]

On Thu, 14 Nov 2019 at 17:47, Peter Maydell <address@hidden> wrote:

> The ARM semihosting ABI also has a number of warts
> which are basically historical legacy. With a clean
> sheet you get to avoid some of them. (Notably you could
> skip the whole 'negotiate presence of extensions' business
> by just getting those parts right from the start

...better still, if you can define (a) a mandatory "return
version and feature bit info" call right from the start
and (b) the required behaviour for attempts to make
a semihosting call with an unknown/unimplemented
function number -- then you can avoid the nasty
kludge "magic behaviour by opening a magic filename"
we were stuck with specifying in arm semihosting 2.0.

thanks
-- PMM