libffi & powerpc

[Patrick Olinet]

Running with gdb, it looks like the problem comes from the
ppc_closure.S file of the libffi/src/powerpc directory, at line 32 :

stfd %f1, 48(%r1)

I don't understand anything to powerpc assembly, but after a google
search, "stfd" means "store floating-point double". But the PPC405
doesn't have any FPU, so I guess that's why it throws an "illegal
instruction".

I've compiled again my cross toolchain with the "--with-float=soft"
option, hoping that it would emulate FPU instruction, but this
unfortunately doesn't help... I'm nevertheless not sure that this
option is the right one...

Any thoughts ? Is there a bug in libffi in that it doesn't support
powerpc CPU without FPU ?

Regards,
Patrick






On 5/8/07, Andrew Haley <aph-gcc@littlepinkcloud.com> wrote:
> Patrick Olinet writes:
>  > Hi there,
>  >
>  > I'm running an embedded platform based on a powerpc 405EP CPU and a
>  > gcc 4.1.0 cross-toolchain. My initial problem was that gcj compiled
>  > binaries crash at runtime when interpreting java bytecode ("Illegal
>  > instruction" message).
>  >
>  > After many investigations, it looks like the problem comes from the
>  > libffi library : I've run the libffi testsuite on my embedded paltform
>  > and many of the tests show the same "Illegal instruction" message. For
>  > instance, the "cls_uint" test crashes at the following line (from the
>  > cls_uint.c file) :
>  >
>  > res = (*((cls_ret_uint)pcl))(2147483647);
>  >
>  > My knowledge about the powerpc architectures is very limited, but I've
>  > seen mailing lists threads talking about "EABI" that I don't quite
>  > understand but my intuition is that it could be related. For instance,
>  > could it be that my cross toolchain is not compiled with the right
>  > EABI (does this question make sense??) ?
>  >
>  > Any ideas or thoughts about this problem ?
>
> Run it in gdb.  When gdb stops with SIGILL, do
>
> x/i $pc
>
> Andrew.
>