Re: powerpc-linux-gnuspe MPC8540/e500 float error

[Dan Kegel <dank at kegel dot com>]

Clemens Koller wrote:
> I am new to this list - so this is maybe a newbie question:
> I have a PowerMac running Linux 2.6.10 and I want to
> cross-compile for a Freescale MPC8540 PPC (Book E, e500, SPE)
> machine.
> Well, I finally need a compiler suite for this e500 architecture
> which generates code for the e500...
>
> Therefore I used Kumar Gala's patches
>
> http://gate.crashing.org/~galak/crosstool-0.28-rc37-e500.patch.bz2
> http://gate.crashing.org/~galak/crosstool-0.28-extra-patches.patch.bz2
>
> for the latest crosstool-0.28-rc37
> and did a demo-e500-ck.sh:
> -----8<---------------------------------------------------------
> eval `cat powerpc-e500.dat gcc-3.4.3-e500-glibc-2.3.3-spe.dat`  sh all.sh -nounpack --builduserland --testlinux --notest

(For the curious, Kumar's powerpc-e500.dat is:

TARGET=powerpc-linux-gnuspe
TARGET_CFLAGS="-O"
GLIBC_ADDON_OPTIONS="=linuxthreads,spe"
KERNELCONFIG=`pwd`/powerpc-e500.config
)

> -----8<---------------------------------------------------------
>
> But I got the following result (beside an error due to a missing
> add-on directory 'spe' I had to create manually):
> ../sysdeps/powerpc/fpu/s_isnan.c: In function `__isnan':
> ../sysdeps/powerpc/fpu/s_isnan.c:44: error: can't find a register in 
> class `FLOAT_REGS' while reloading `asm'
> ../sysdeps/powerpc/fpu/s_isnan.c:47: error: can't find a register in 
> class `FLOAT_REGS' while reloading `asm'
> make[2]: *** 
> [/home/clemens/cross/crosstool-0.28-rc37/build/powerpc-linux-gnuspe/
> gcc-3.4.3-glibc-2.3.3/build-glibc/math/s_isnan.o] Error 1
> -----8<---------------------------------------------------------

http://www.freescale.com/files/32bit/doc/app_note/AN2490.pdf
says that processor doesn't support the floading point registers
fp0-fp31.  Evidently Kumar handled that by patching glibc-2.3.2.

I bet the problem was that you were trying to build glibc-2.3.3, but
you don't have that patched for your processor.  Try building
glibc-2.3.2 instead, or finding glibc-2.3.3 patches for the e500,
or forward-porting them yourself.
- Dan

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