Difficulty in compiling(unsupported relocation against csrr0.)

[Alan Modra]

On Tue, Sep 14, 2004 at 01:37:30PM -0700, Bradley Remedios wrote:
> The registers are say csrr0, csrr1, ccr0, dbcr0, etc...

gas does not have built-in support for these register names.  If you
want to use them in your code, I suggest defining the values yourself,
eg.

csrr0 = 58

      mtspr csrr0, r9

> I used to get the "unsupported relocation against rX" where X is a
> register number until I started to use the -mregnames switch.

Yes, because without -mregnames, identifiers such as "r9" I used above
are treated as undefined symbols.  You'd need a special 6 bit reloc
for a particular register field in the instruction if we wanted to
delay register choice until linking.

> I get Unrecognized opcode iccci and dccci, but no other errors.

This is a bug, I suppose.  You want -mbooke for the altivec support
on the 440EP, but as you've discovered..

> Also, using "-mbooke -m440" or "-m440 -mbooke" just causes the final
> one to be used.

We probably should have a -m440ep option.

-- 
Alan Modra
IBM OzLabs - Linux Technology Centre