gnupic: Re: sdcc feature request
Subject:
re: sdcc feature request
From:
Peter ####@####.####
Date:
29 Apr 2005 21:22:31 +0100
Message-Id: <mlg.xhvh@qeti.cetb.aa>
I have a feature request:
I would like code like:
code char at 0x1234 foo[] = "abcd";
to generate initialised data at the indicated absolute address. Assume
that the absolute address chosen will not collide with anything
generated by the compiler for a start. This does not happen currently,
and no error is raised. For example, compiling something like:
--snip--
code char at 0x2000 foo = '0';
void main(void)
{
char x;
x = foo;
}
--snap--
yields in .rst:
--snip--
162 .area CSEG (CODE)
1000 163 _foo = 0x1000
--snap--
and the relevant binary output shows no trace of the initialisation. It
does not make any difference if the symbol is invoked in any function.
The feature would be useful for embedding signature and mark bytes in
object files. These must often be located at well known absolute
addresses to work as intended.
I would like to know if such a feature would be welcome, if someone
could implement it in sdcc (I am currently linking an externally
generated assembly .rel file to implement this), and if not, helpful
hints as to where approximately the code generator should be changed to
make it happen. The parser obviously accepts the statement so that is
not a problem.
thanks,
Peter
