symbol_ref constants

[Nathan Sidwell]

Sanjiv Kumar Gupta wrote:

> calculated by linker. 
> Now
>   add r1, foo
>   add r1, 10
>   add r1, -10
> are okay but 
>   add r1, foo + 10
>   add r1, -10 
> are not, since (foo + 10)  may  overflow during
> relocation, so the value (foo + 10) && 0xff inserted
> by linker is not correct.

What is stopping the value of 'foo' itself being > 255?

nathan

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