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From: Oliver Kleinke <oliver.kleinke@c-01a.de>
Newsgroups: comp.lang.ada
Subject: Re: Interrupt-driven Usart not working in Ada, but in C working,
 why?
Date: Mon, 17 Mar 2014 15:08:11 +0100
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Date: 2014-03-17T15:08:11+01:00
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Am Sun, 16 Mar 2014 17:21:58 -0700 (PDT)
schrieb "Rego, P." <pvrego@gmail.com>:

> I put the complete Ada objectdump part at http://is.gd/au08Fs. And
> the C part got from .lss in Atmel Studio I put in http://is.gd/qKpAuk.

The interrupt vector table in the disassembly is total garbage, the
vector for your ISR is not even generated.
The IV at 0x90 points to 0x2f46 <__bad_interrupt> which contains
this instruction:

00002f46 <__bad_interrupt>:
    2f46:	0c 94 00 00 	jmp	0 ; 0x0 <__vectors>

So there you have your reset. I guess you should follow Rolf's advice
and try a newer gcc.