Removes usage of AsmFull which required an optimization pass to remove the map parameter passed into it. This caused issues when compiling with -opt=0 where memory for the map was being allocated as an unintended side-effect of using AsmFull with no optimizations enabled.
We have an optimization for this specific pattern, but it's really just
a hack. With the addition of unsafe.Add in Go 1.17 we can directly
specify the intent instead and eventually remove this special case.
The code is also easier to read.
machine/stm32, nrf: implement machine.Flash
Implements the machine.Flash interface using the same definition as the tinyfs BlockDevice.
This implementation covers the stm32f4, stm32l4, stm32wlx, nrf51, nrf52, and nrf528xx processors.
Blocking inside an interrupt is always unsafe and will lead to all kinds
of bad behavior (even if it might appear to work sometimes). So disallow
it, just like allocating heap memory inside an interrupt is not allowed.
I suspect this will usually be caused by channel sends, like this:
ch <- someValue
The easy workaround is to make it a non-blocking send instead:
select {
case ch <- someValue:
default:
}
This does mean the application might become a bit more complex to be
able to deal with this case, but the alternative (undefined behavior) is
IMHO much worse.
Some vector registers must be preserved across calls, but this wasn't
happening on Linux and MacOS. When I added support for windows/arm64, I
saw that it required these vector registers to be preserved and assumed
this was Windows deviating from the standard calling convention. But
actually, Windows was just implementing the standard calling convention
and the bug was on Linux and MacOS.
This commit fixes the bug on Linux and MacOS and at the same time merges
the Go and assembly files as they no longer need to be separate.
