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From: Simon Wright <simon@pushface.org>
Newsgroups: comp.lang.ada
Subject: Re: How to emulate multiple exports
Date: Tue, 21 Apr 2020 08:58:21 +0100
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Date: 2020-04-21T08:58:21+01:00
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Jere <jhb.chat@gmail.com> writes:

> On Monday, April 20, 2020 at 5:57:06 AM UTC-4, Simon Wright wrote:
>> Jere  writes:
>> 
>> > I am working in a space constrained environment (256k flash)
>> > and I want to try and reuse the same exported function for
>> > all of my unused interrupt handlers.
>> 
>> I don't know if it'll help, but I handle a similar problem in Cortex
>> GNAT RTS starting here:
>> 
>> https://github.com/simonjwright/cortex-gnat-rts/blob/master/stm32f4/adainclude/startup.adb#L147
>
> That looks closer to what I was trying.  Out of curiosity, how
> does it handle someone wanting to later on assign a specific
> peripheral ISR (like a timer for example)?  It looks like
> all the remaining ISR slots use the same external 
> symbol (IRQ_Handler)

It doesn't. Of course it could (write to the interrupt vector & set the
hardware interrupt priority in NVIC), but you wouldn't then be able to
use a protected handler. I don't think you'd want to? the reason for
having a specific handler would be for performance, e.g. drone motor
electronic speed control.