1 files changed, 18 insertions(+), 11 deletions(-)

M pc/main.c

@@ 423,14 423,12 @@ confinit(void)
 
 static char* mathmsg[] =
 {
-	"invalid",
-	"denormalized",
-	"div-by-zero",
-	"overflow",
-	"underflow",
-	"precision",
-	"stack",
-	"error",
+	nil,	/* handled below */
+	"denormalized operand",
+	"division by zero",
+	"numeric overflow",
+	"numeric underflow",
+	"precision loss",
 };
 
 static void


@@ 446,14 444,23 @@ mathnote(void)
 	 * Some attention should probably be paid here to the
 	 * exception masks and error summary.
 	 */
-	msg = "unknown";
-	for(i = 0; i < 8; i++){
+	msg = "unknown exception";
+	for(i = 1; i <= 5; i++){
 		if(!((1<<i) & status))
 			continue;
 		msg = mathmsg[i];
 		break;
 	}
-	sprint(note, "sys: fp: %s fppc=0x%lux", msg, up->fpsave.pc);
+	if(status & 0x01){
+		if(status & 0x30){
+			if(status & 0x200)
+				msg = "stack overflow";
+			else
+				msg = "stack underflow";
+		}else
+			msg = "invalid operation";
+	}
+	sprint(note, "sys: fp: %s fppc=0x%lux status=0x%lux", msg, up->fpsave.pc, status);
 	postnote(up, 1, note, NDebug);
 }