Re: Assembler message: "unsupported relocation type" with MPC555 crosscompiler

[Frank <frannk_m1 at yahoo dot com>]

Most of the time, this error occurs when you use a #define that
can't be found. (ie. defined in a header file you're not
including)...

--- Carl Miller <chaz@energoncube.net> wrote:
> On Wed, Jul 24, 2002 at 04:25:26PM +0200, Matthias Fertig
> wrote:
> > i ran powerpc-eabi-gcc
> > 
> > 	powerpc-eabi-gcc -g -S -mcpu=555 -I../../mpc555/include
> main.c
> > 
> > and looked into main.s
> > 
> > 
> > #231:	.LM18:
> > #232:		 mtspr EIE, r3 
> > #233:	.stabn 68,0,44,.LM19-main
> > 
> > the "move to special purpose register" looks good, for my
> opinion.
> 
> What is EIE defined as?  I don't do much PPC assembly these
> days, but I
> seem to remember that PPC SPR numbers are of a small and
> oddball bit
> width (was it ten bits wide?).  It's possible this error could
> arise if
> EIE were defined to be a quantity too large to fit in this
> field.  If
> my ten bits guess is correct, then double-check that EIE <=
> 0x3ff, for
> example.
> 
> > i don't understand the reason of the error? what does it
> mean, if there
> > is a problem with an allocaion type?
> 
> It's an error generally given with branch/jump instructions. 
> In that
> scenario, it means that the address you're trying to jump to
> cannot be
> represented in the instruction you're trying to jump with from
> the address
> you're trying to jump from.  Example: perhaps you're trying to
> use a
> PC-relative branch with only 8 bits of offset and your branch
> target is
> more than +/- 128 away.
> 
> It might also mean that the particular flavor of branch
> instruction that
> either you've asked for, or that is required to reach the
> branch target,
> is not supported by the particular revision of CPU gcc thinks
> you're
> compiling for.  Example: say you're using a CPU architecture
> called FARM
> (yes, I'm making this up) that has PC-relative branches. 
> FARM3 only had
> PCrel branches with 8 bit offsets, but FARM4 added a version
> with a 12-bit
> offset.  If GCC sees that the 12-bit variant is required to
> reach your
> branch target, but you've told it (-mcpu= option to either
> configure or
> GCC itself) that you're compiling specifically for FARM3, it
> may throw an
> error complaining about the relocation type.
> 
> I've never seen this type of error thrown for a PPC mtspr
> instruction,
> but based on what it means for branches, I've gotta guess it's
> complaining
> that whatever EIE is, it will not fit in the SPRN field of the
> mtspr
> instruction.
> 
> Good luck!
> 
> 
>                          Carl Miller
> 
> 
> > "William A. Gatliff" schrieb:
> > > 
> > > Matthias:
> > > 
> > > >       powerpc-eabi-gcc -g -c -mcpu=555 -I$(INCLUDES) -o
> main.o main.c
> > > >       /tmp/cckZyIqV.s: Assembler messages:
> > > >       /tmp/cckZyIqV.s:232: Error: unsupported relocation
> type
> > > >       /tmp/cckZyIqV.s:232: Error: unsupported relocation
> type
> > > >       make: *** [main.o] Fehler 1
> > > 
> > > Run the source file through gcc with -g -S, and have a
> look at line
> > > 232.  This could be a gcc or assembler problem, knowing
> what the
> > > offending instruction is would help.
> 
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