Re: [avr-gcc-list] Text in .text areas (was AVR gcc port)

[J.C. Wren]

Theodore A. Roth wrote:

> > On Sun, 18 Jan 2004, J.C. Wren wrote:
> >
> >  
> >
> > >    Assuming one has the structure below, how does one declare the text
> > > in the structure to be placed in .text instead of .data?  I've figured
> > > out how to obtain .text placement for strings passed in functions, but
> > > that (as expected, based on the macro definition) gives errors for text
> > > in structures.
> > >
> > >    --jc
> > >
> > > typedef struct commandList_s
> > > {
> > >   PGM_P command;
> > >   void (*handler) (void);
> > >   PGM_P help;
> > > }
> > > commandList_t;
> > >
> > > //
> > > //
> > > //
> > > PROGMEM commandList_t commandList  [] =
> > > {
> > >   { "?",               cmd_help,         "This help list" },
> > >   { "version",         cmd_version,      "Display version" },
> > >   { NULL,              NULL,             NULL }
> > > };
> > >   
> >
> >
> > Here's a structure I use in one of my projects:
> >
> > struct menuitem
> > {
> >    FP_MenuItemHandler handler; /**< Function called to handler selected
> >                                     item. */
> >    const char * PROGMEM desc;  /**< Text description of menu item. 
> > Must point
> >                                     to a string in program space. */
> > };
> >
> > The struct lives in program space (.text) and when needed is copied to
> > sram.
> >
> > Hope that helps.
> >
> > Ted Roth
> >  
> Sorry, when I created the message I did it via a reply, so I've 
> corrected the topic.
>
> Unfortunately, this doesn't help :)  I want to keep the structure in 
> .text.  Basically, everything is a constant.  This all worked under 
> ICC, and I was trying to port it to GCC.
>
> I've tried a number of things, and keep running into problems with 
> pointers (seemingly) refusing to dereference correctly when items are 
> in .text.   In the example above, I want to keep the help text in 
> .text, and I can't determine how to declare it in the instantiation of 
> the structure.  In the disassembly, the structure is being placed in 
> .text, but the pointers are still to .data , inspite of the "PGM_P 
> help" or "const char * PROGMEM help"
>
>    --jc