Raphael,
thanks for explanation. Would generating symbols instead of sections
including res instructions solve the problem? For example:
_foo EQU 0x0040
_bar EQU 0x0041
instead of
UD_abs_main_40 udata_ovr 0x0040
_foo
res 2
UD_abs_main_41 udata_ovr 0x0041
_bar
res 1
Borut
On 13. 01. 2013 23:59, Raphael Neider wrote:
> Hi Borut,
>
> On Sun, 13 Jan 2013 21:34:45 +0100, Borut Ražem <borut.ra...@gmail.com>
> wrote:
>
>> On 13. 01. 2013 19:26, Molnár Károly wrote:
>>> On Sun, 13 Jan 2013 17:37:00 +0100
>>> Raphael Neider <rnei...@web.de> wrote:
>>>
>>>> We end up with ADRESL and ADRESw
>>>> occupying 0xFC3 as well as ADRSH and ADRESw occupying 0xFC4. *Should*
>>>> the linker allow this?!?
>>>>
>>> But, unfortunately, I has just discovered that the gplink produce
>>> errors. :-((
>> What kind of errors? Aren't sfr definitions just mapped to EQUs in asm?
>> Can you please provide a short example so that I can analyze it from the
>> gplink perspective?
> sfr definitions are turned into udata / udata_ovr sections (see below) in
> order to properly allocate the memory for/to the register.
>
> neider@neider-virtual:/media/daten/neider/test/sfr16$ cat main.c
> __at(0x40) unsigned foo;
> __at(0x41) __sfr bar;
>
> void main () {}
> neider@neider-virtual:/media/daten/neider/test/sfr16$
> ../../sdcc.svn/build/bin/sdcc -mpic14 -p16f877a main.c --use-non-free
> message: using default linker script
> "/home/neider/local.svn/share/gputils/lkr/16f877a_g.lkr"
> error: multiple sections using address 0x41
>
> main.asm contains:
> UD_abs_main_40 udata_ovr 0x0040
> _foo
> res 2
> UD_abs_main_41 udata_ovr 0x0041
> _bar
> res 1
>
>
> From my point of view, this is exactly the right thing to do for the
> linker. If we want the overlap, we should use a union. Otherwise, the
> linker should ensure that apparently separate data objects are in fact
> separate, i.e., they reside in disjoint memory regions.
>
> Kind regards
> Raphael
>
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