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Re: Problem with ld for PDP-11
On Wed, Feb 12, 2020 at 11:18:50PM -0800, Stephen Casner wrote:
> On Thu, 13 Feb 2020, Alan Modra wrote:
>
> > On Wed, Feb 12, 2020 at 10:02:02PM -0800, Stephen Casner wrote:
> > > So now I went digging my way back through the code sequence using
> > > printfs to find where the original data size gets rounded up. It
> > > turns out that the size of the data section is always even because the
> > > assembler "as" or "gas" always pads the data section with a zero byte
> > > if the size is odd, so the object file header always contains an even
> > > size for the .data section. That's because there is always relocation
> > > and symbol information following it.
> > >
> > > Therefore the size of the .data section in ld is always even
> >
> > No, a linker script might contribute to .data output.
>
> Oh, that's something I don't know about. Can you point me to an
> example so I can try it?
You could use ld/ldscripts/pdp11.x (which is the default script you'll
be using for normal executables), and add the line
BYTE (0)
after CONSTRUCTORS. Then link using -T.
--
Alan Modra
Australia Development Lab, IBM