mipsfpu(2) — bsd — mips UMIPS RISC/os 4.52



MIPSFPU(2-BSD)      RISC/os Reference Manual       MIPSFPU(2-BSD)



NAME
     mipsfpu - enabling and dissabling the floating-point unit

SYNOPSIS
     int
     mipsfpu(x)
     int x;

DESCRIPTION
     This system call is used to enable and disable the
     floating-point unit. An non-zero argument enables and a zero
     argument disables the floating-point unit.  When disabled
     the system emulates all instructions in software.  This can
     only be executed by the super-user.

ERRORS
     mipsfpu fails when the following occurs:

     EPERM               The caller is not the super-user.

WARNING
     If you disable a floating-point unit which produces impre-
     cise exceptions (the R2360) just as a program using the
     floating-point unit is handling a signal which is trying to
     retrieve the floating-point instruction causing the signal
     based on the floating-point unit's implementation revision
     register that program will fail to get the floating-point
     instruction that caused the signal.  This is because the
     implementation revision register changed between the time
     the instruction causing the signal was executed and the time
     signal handler handled it.
























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