Re: Assembler in C

[Michael Svetlik <m dot svetlik at ssi-schaefer-peem dot com>]

Daniel,

it seems your gcc command line is missing a 'compile only' - or 
'assemble only'- switch. That '-s', for your assembler file, would let 
gcc just call cpp and 'as', and then stop. The linker won't be engaged 
in that game.
BTW, the GNU gcc is a very smart guy: when I want to have some 
executable from him - native or cross, it's the same - I just throw all 
the source code, libraries and switches into it, and it spits a file. 
Have a look at http://gcc.gnu.org/onlinedocs/, they have  a lot of 
pretty docs there.

HTH
Michael

Daniel Lidsten wrote:

> Hi again,
>
> > The example you provide for AnyFunction() won't work with 
> > gcc.  The syntax just doesn't work like that.  If you're 
> > trying to do that much in assembly, it probably belongs in a 
> > .S file anyway--- with a few lines of inline assembly code to 
> > glue it to the C environment (again, using operand constraints).
> I followed your advice and created a new .S file where i put my new
> function. I have attached a small portion of the code below:
>
> 	.type MyFnc,@function; 
>      .globl MyFnc;           
> MyFnc:   
> 		//Set the MSR to zero. It is the reset configuration. 
> 		lwi	r0,0
> 		mtmsr   r0
>
> 		// Mask interrupt sources in the SIU
> 		lis	r2,0
> 		lwi	r3,CYGARC_REG_IMM_SIMASK
> 		stw	r2,0(r3)
>
>
> But when i tried to assemble the file i got the following error:
>
> --------------- Standard ERROR from assembling various_asm_fnc.S.
> ---------------
> /tools/powerpc-eabi/bin/ld: warning: cannot find entry symbol _start;
> defaulting to 01800074
>
> Since _start is located within another .S file i tried to fix it by
> adding a .extern _start but it didn't help.
>
> I don't get it, why do i get an error from ld when assembling? Why do
> the file need to know where _start is, all that stuff should be done
> later on while linking.
>
> Regards, Daniel
>
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