Date: Mon, 11 Oct 1999 13:28:15 +0200 (IST)
From: Eli Zaretskii <eliz AT is DOT elta DOT co DOT il>
X-Sender: eliz AT is
To: djgpp-workers AT delorie DOT com
Subject: Masking FP exceptions under emulator
Message-ID: <Pine.SUN.3.91.991011132443.28578I-100000@is>
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
Reply-To: djgpp-workers AT delorie DOT com

It turns out that the startup code only masks all numeric exceptions when 
an FPU is detected.  If we use emulation, the emulator is left with 
whatever default it was built (which, not surprisingly, leaves the 
Invalid Operation unmasked).

Is there any reason not to mask all the exceptions, like we do with a 
real FPU?  If nobody can think of a reason, I will check in the following 
change:

*** src/libc/emu387/npxsetup.c~1	Fri Oct  1 15:12:52 1999
--- src/libc/emu387/npxsetup.c	Fri Oct  8 13:28:52 1999
*************** void _npxsetup(char *argv0)
*** 127,132 ****
--- 127,134 ----
  	}
  #endif
        signal(SIGNOFP, nofpsig);
+       /* mask all exceptions for the emulation case, too */
+       _control87(0x033f, 0xffff);
      }
    }
  }