Re: [PATCH/RFA] Fix C-referenceable sections with explicit LMAs

[Alan Modra <amodra at bigpond dot net dot au>]

On Sun, Dec 15, 2002 at 05:02:03PM -0800, Jason R Thorpe wrote:
> On Thu, Dec 12, 2002 at 10:29:23AM +0000, Nick Clifton wrote:
> 
>  > Maybe what we need here is a new keyword then.  Something like
>  > SIZEOF_INCLUDING_ORPHANS (or something less wordy) which would mean
>  > "the size of the section plus the size of any attached orphan
>  > sections".  Then in the documentation we could make it clear that
>  > SIZEOF is just the size of the basic section without any attachments,
>  > and provide an example of the difference.
>  > 
>  > What do you think ?
> 
> I guess that would be fine.  It's still annoying that existing linker
> scripts would not continue to work, but at least the recommended fix
> is much simpler.
> 
> I'll work on a SIZEOF_WITH_ORPHANS (*slightly* less wordy :-) patch
> tonight.

I really don't see why any of this is necessary.  You can set LMAs
using something like:

SECTIONS
{
  .text (0x00800000) : AT (0x10800000)
    { *(.text) }
  textpad = ALIGN (0x1000) - .;
  . = . + textpad;
  .rodata : AT (ADDR (.rodata) - textpad + LOADADDR (.text) - ADDR (.text))
    { *(.rodata) }
  rodatapad = ALIGN (0x1000) - .;
  . = . + rodatapad;
  .data : AT (ADDR (.data) - rodatapad + LOADADDR (.rodata) - ADDR (.rodata))
    { *(.data) }
etc.
}

or equivalently

SECTIONS
{
  .text (0x00800000) : AT (0x10800000)
    { *(.text) }
  end_of_text_plus_orphans = .;
  . = ALIGN (0x1000);
  .rodata : AT (end_of_text_plus_orphans + LOADADDR (.text) - ADDR (.text))
    { *(.rodata) }
etc.
}

This should have exactly the same effect as using the proposed new
keyword, except that it defines a few syms and is a little more wordy.

-- 
Alan Modra
IBM OzLabs - Linux Technology Centre