PowerPC EABI segment alignment

Daniel Jacobowitz drow@false.org
Tue Mar 4 03:12:00 GMT 2008


On Mon, Mar 03, 2008 at 06:56:49PM -0800, Michael Eager wrote:
>>> Binutils follows the SVR4 specification, even when built with
>>> --target=powerpc-eabi and sets segment alignment as 0x10000.
>>> (Except for QNX, where the alignment is 0x1000).  This causes problems
>>> with non-hosted PPC boards with limited memory: the desired alignment
>>> is 8 bytes, to avoid memory holes.

> -N makes read-only sections writable which leads them to
> being merged with writable sections.  That's undesirable
> when you want to put R/O data in ROM and R/W in RAM.
> Text segment is still aligned on a 64K boundary, IIRC.

I don't understand.  How can you both want to avoid padding
to a page boundary, and want to put ROM and RAM in different
devices?  If you want the segments in different devices you
need to align between them.

-- 
Daniel Jacobowitz
CodeSourcery



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