Messages in this thread | | | Date | Tue, 15 Jan 2002 09:46:54 -0500 (EST) | From | "Richard B. Johnson" <> | Subject | Re: floating point exception |
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On Tue, 15 Jan 2002, Zwane Mwaikambo wrote:
> On 14 Jan 2002, Christian Thalinger wrote: > > > It seems the floating point exception is only raised with a new data > > package. Is there a simple way to raise such a exception? > > New data package? And does the same behaviour re-occur after the fpu > exception? ie programs start segfaulting etc. Can you try doing a "dmesg" > after the segfaults and fpu exception and see if there is anything in the > kernel ring buffer too. > > Regards, > Zwane Mwaikambo
This will allow you to generate some math-errors and see if everything works okay. By default, upon process creation, math errors like /0 are masked.
/* * Note FPU control only exists per process. Therefore, you have * to set up the FPU before you use it in any program. */ #include <i386/fpu_control.h>
#define FPU_MASK (_FPU_MASK_IM |\ _FPU_MASK_DM |\ _FPU_MASK_ZM |\ _FPU_MASK_OM |\ _FPU_MASK_UM |\ _FPU_MASK_PM)
void fpu() { __setfpucw(_FPU_DEFAULT & ~FPU_MASK); }
main() { double zero=0.0; double one=1.0; fpu();
one /=zero; }
Cheers, Dick Johnson
Penguin : Linux version 2.4.1 on an i686 machine (797.90 BogoMips).
I was going to compile a list of innovations that could be attributed to Microsoft. Once I realized that Ctrl-Alt-Del was handled in the BIOS, I found that there aren't any.
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