[fpc-devel] arm embedded cortexm3 procedure address

[Jonas Maebe]

Geoffrey Barton wrote on Wed, 14 Jul 2010:

> the resulting constant disassembles as:-
>
> 1bc:	000001a5 	.word	0x000001a5
>
> which seems to be one greater than the address of the procedure.
> Is this right?

Yes.

> If so, why?

To identify the code as Thumb code.

> also, why does the compiler sometimes add a 'nop' to the end of a  
> procedure (as above)?

The default alignment of routines is 4 bytes. And it's most likely the  
assembler or linker that adds the nop, rather than the compiler.


Jonas

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