Re: [avr-gcc-list] C and AS programs - compiled together

[Ned Konz]

Grzegorz !Kubik wrote:
>  >> I would like to align 256B buffer at the RAM address 0xXX00 - to use
>  >> 8-bit buffer pointers.
>  >
>  > Well, IMHO there's an .align pseudo-op.  This is potentially wasting
>  > up to 255 bytes of RAM then.
>  >
> Agree. But my task is to reuse existing assembler program (that has 
> 8-bit pointers for simplicity and speed), so waisting some RAM is 
> acceptable.

How are you getting 8-bit pointers to work in avr-gcc?

> .align is from assembler side. C declarations look more convenient for 
> me. But I found in:
> http://gcc.gnu.org/onlinedocs/gcc-4.1.2/gcc/Attribute-Syntax.html#Attribute-Syntax
> that: "...for example, the usage of `aligned' and `noreturn' attributes 
> given above is not yet supported"
> What is and what is not supported?
> Anyway, reading linker manual may be necessary ;-(
> I would prefer simple example of aligning 256B buffer to 0xXX00 address 
> in RAM...

The linker manual is not large.

It's probably easiest to define a section starting on the appropriate 
boundary (using a custom linker file), and then tell the compiler to put 
the buffer into that section.

--
Ned Konz
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http://bike-nomad.com