[src/trunk]: src/sys/arch/x68k/x68k Handle T_ILLINST in kernel mode.

[minoura <minoura%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/ba82951e9749
branches:  trunk
changeset: 472024:ba82951e9749
user:      minoura <minoura%NetBSD.org@localhost>
date:      Sun Apr 18 14:39:10 1999 +0000

description:
Handle T_ILLINST in kernel mode.
This occurs in fpu_probe() when the FPU is not installed on the system.
Because of this, FPU_EMULATE wouldn't work at all.

diffstat:

 sys/arch/x68k/x68k/trap.c |  26 ++++++++++++++++++++++++--
 1 files changed, 24 insertions(+), 2 deletions(-)

diffs (54 lines):

diff -r 57c4a3bd30d1 -r ba82951e9749 sys/arch/x68k/x68k/trap.c
--- a/sys/arch/x68k/x68k/trap.c Sun Apr 18 14:37:09 1999 +0000
+++ b/sys/arch/x68k/x68k/trap.c Sun Apr 18 14:39:10 1999 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: trap.c,v 1.31 1999/03/26 23:41:39 mycroft Exp $        */
+/*     $NetBSD: trap.c,v 1.32 1999/04/18 14:39:10 minoura Exp $        */
 
 /*
  * Copyright (c) 1988 University of Utah.
@@ -49,6 +49,7 @@
 #include "opt_compat_sunos.h"
 #include "opt_compat_hpux.h"
 #include "opt_compat_linux.h"
+#include "opt_fpuemulate.h"
 
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -404,6 +405,26 @@
                i = SIGFPE;
                break;
 
+       /*
+        * FPU faults in supervisor mode.
+        */
+       case T_ILLINST: /* fnop generates this, apparently. */
+       case T_FPEMULI:
+       case T_FPEMULD: {
+               extern label_t *nofault;
+
+               if (nofault)    /* If we're probing. */
+                       longjmp(nofault);
+               if (type == T_ILLINST)
+                       printf("Kernel Illegal Instruction trap.\n");
+               else
+                       printf("Kernel FPU trap.\n");
+               goto dopanic;
+       }
+
+       /*
+        * Unimplemented FPU instructions/datatypes.
+        */
        case T_FPEMULI|T_USER:  /* unimplemented FP instuction */
        case T_FPEMULD|T_USER:  /* unimplemented FP data type */
 #ifdef FPU_EMULATE
@@ -705,7 +726,8 @@
                break;
            }
        }
-       trapsignal(p, i, ucode);
+       if (i)
+               trapsignal(p, i, ucode);
        if ((type & T_USER) == 0)
                return;
 out: