newlib on powerpc-eabi with soft-float
Joel Sherrill
joel.sherrill@OARcorp.com
Thu May 2 08:57:00 GMT 2002
Christopher Jenkins wrote:
>
> Hi,
>
> I'm trying to build a toolchain for a powerpc-eabi target on an RS/6000 AIX
> host. I can successfully build and use the following:
>
> binutils-2.12
> gcc-2.95.3
> newlib-1.10.0
>
> However, the target processor (MC8260) has no floating point unit
Are you sure about that? According to this:
http://e-www.motorola.com/brdata/PDFDB/docs/MPC8260TS.pdf
and my paper copy of a Motorola PowerPC selector guide
it has an FPU. Sounds more like the startup code is
not enabling the FPU to me.
> and I'm
> not sure whether Newlib is aware of this. Specifically, in setjmp.S, there
> are a few lines of code to save the floating point registers (which the
> MC8260 does not have) wrapped in an #ifndef _SOFT_FLOAT. I'm guessing that
> _SOFT_FLOAT should be being defined somewhere, but I'm not sure where. Is
> there any option that I can give to the configuration script such that this
> macro will be defined? I'm not too keen on hacking the code since I'm sue
> that there must be another way...
>
> Incidentally, I already give the --nfp switch to the configuration scripts
> of binutils, gcc and newlib, but this doesn't seem to have much of an
> effect.
>
> Cheers,
>
> Chris
>
> Chris Jenkins
> IBM UK Laboratories
> Chris.Jenkins@uk.ibm.com
>
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--
Joel Sherrill, Ph.D. Director of Research & Development
joel@OARcorp.com On-Line Applications Research
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