RE: Assembler in C

["Daniel Lidsten" <Daniel dot Lidsten at combitechsystems dot com>]

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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