Guo Ren <ren_guo@xxxxxxxxx> writes: > --- /dev/null > +++ b/arch/csky/abiv2/fpu.c > +void fpu_fpe(struct pt_regs * regs) > +{ > + int sig; > + unsigned int fesr; > + siginfo_t info; > + > + fesr = mfcr("cr<2, 2>"); > + > + if(fesr & FPE_ILLE){ > + info.si_code = ILL_ILLOPC; > + sig = SIGILL; > + } > + else if(fesr & FPE_IDC){ > + info.si_code = ILL_ILLOPN; > + sig = SIGILL; > + } > + else if(fesr & FPE_FEC){ > + sig = SIGFPE; > + if(fesr & FPE_IOC){ > + info.si_code = FPE_FLTINV; > + } > + else if(fesr & FPE_DZC){ > + info.si_code = FPE_FLTDIV; > + } > + else if(fesr & FPE_UFC){ > + info.si_code = FPE_FLTUND; > + } > + else if(fesr & FPE_OFC){ > + info.si_code = FPE_FLTOVF; > + } > + else if(fesr & FPE_IXC){ > + info.si_code = FPE_FLTRES; > + } > + else { > + info.si_code = NSIGFPE; > + } > + } > + else { > + info.si_code = NSIGFPE; > + sig = SIGFPE; > + } > + info.si_signo = SIGFPE; > + info.si_errno = 0; > + info.si_addr = (void *)regs->pc; > + force_sig_info(sig, &info, current); > +} This use of sending a signal is buggy. It results in undefined values being copied to userspace. Userspace should never be sent NSIGXXX as a si_code. You can use FPE_FLTUNK for this default case. In new code please use force_sig_fault instead of force_sig_info in new code. That saves you the trouble of messing with struct siginfo. Thank you very much, Eric Biederman