More bug fixes for overflow handling

git-svn-id: https://yap.svn.sf.net/svnroot/yap/trunk@1165 b08c6af1-5177-4d33-ba66-4b1c6b8b522a

C/sysbits.c

@@ -1040,7 +1040,7 @@ SearchForTrailFault(void)
     /*    my_signal_info(SIGSEGV, HandleSIGSEGV); */
   } else
 #endif /* OS_HANDLES_TR_OVERFLOW */
-    Yap_Error(OUT_OF_TRAIL_ERROR, TermNil,
+    Yap_Error(FATAL_ERROR, TermNil,
 	  "likely bug in YAP, segmentation violation");
 }
 
@@ -1048,8 +1048,7 @@ static RETSIGTYPE
 HandleSIGSEGV(int   sig)
 {
   if (Yap_PrologMode & ExtendStackMode) {
-    fprintf(stderr,  "%% YAP FATAL ERROR: OS memory allocation crashed: bailing out~n");
-    exit(1);
+    Yap_Error(FATAL_ERROR, TermNil, "OS memory allocation crashed at address %p, bailing out\n",Yap_TrailTop);
   }
   SearchForTrailFault();
 }