From a3e95f99d2da1597feffe0fe1db8531197e86f59 Mon Sep 17 00:00:00 2001
From: "Anthony J. Bentley" <anthony@cathet.us>
Date: Tue, 27 Jan 2015 04:56:42 -0700
Subject: [PATCH] rgbasm: Fix a division by zero in section address specifiers.

---
 src/asm/asmy.y | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/src/asm/asmy.y b/src/asm/asmy.y
index d5816b5d..e34d0047 100644
--- a/src/asm/asmy.y
+++ b/src/asm/asmy.y
@@ -992,8 +992,16 @@ const			:	T_ID							{ $$ = sym_GetConstantValue($1); }
 				|	const T_OP_SHL const			{ $$ = $1 << $3; }
 				|	const T_OP_SHR const			{ $$ = $1 >> $3; }
 				|	const T_OP_MUL const			{ $$ = $1 * $3; }
-				|	const T_OP_DIV const			{ $$ = $1 / $3; }
-				|	const T_OP_MOD const			{ $$ = $1 % $3; }
+				|	const T_OP_DIV const			{
+	if ($3 == 0)
+		fatalerror("division by zero");
+	$$ = $1 / $3;
+	}
+				|	const T_OP_MOD const			{
+	if ($3 == 0)
+		fatalerror("division by zero");
+	$$ = $1 % 3;
+	}
 				|	T_OP_ADD const %prec NEG		{ $$ = +$2; }
 				|	T_OP_SUB const %prec NEG		{ $$ = -$2; }
 				|	T_OP_NOT const %prec NEG		{ $$ = 0xFFFFFFFF^$2; }