MODulo instruction

2 files changed, 8 insertions, 0 deletions

diff --git a/src/ops.h b/src/ops.h
index e42656f..47e4862 100644
--- a/src/ops.h
+++ b/src/ops.h
@@ -28,6 +28,7 @@ enum {
 	OP_SUB,
 	OP_MUL,
 	OP_DIV,
+	OP_MOD,
 	OP_AND,
 	OP_ORA,
 	OP_XOR,
@@ -67,6 +68,7 @@ static const char ops[][4] = {
 	[OP_SUB] = "SUB",
 	[OP_MUL] = "MUL",
 	[OP_DIV] = "DIV",
+	[OP_MOD] = "MOD",
 	[OP_AND] = "AND",
 	[OP_ORA] = "ORA",
 	[OP_XOR] = "XOR",
diff --git a/src/orgaemu.c b/src/orgaemu.c
index e08199b..e57601d 100644
--- a/src/orgaemu.c
+++ b/src/orgaemu.c
@@ -329,6 +329,12 @@ exec_op(uint16_t *mem, long pc)
 		push(a / b);
 		return pc + 1;
 	}
+	case OP_MOD: {
+		const uint16_t b = pop();
+		const uint16_t a = pop();
+		push(a % b);
+		return pc + 1;
+	}
 	case OP_AND:
 		push(pop() & pop());
 		return pc + 1;