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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