1 files changed, 46 insertions, 0 deletions
diff --git a/j_type_handler.c b/j_type_handler.c
new file mode 100644
index 0000000..648e882
--- /dev/null
+++ b/j_type_handler.c
@@ -0,0 +1,46 @@
+/*
+    Nios-sim - one simple NIOSII simulator only for personal interest and fun.
+    Copyright (C) 2010  chysun2000@gmail.com
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License along
+    with this program; if not, write to the Free Software Foundation, Inc.,
+    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
+#include <stdio.h>
+#include "public.h"
+#include "niosii.h"
+#include "instruction.h"
+
+static uint32_t call(struct NIOS_CPU * cpu, uint32_t code)
+{
+	def_j_type_code;
+	uint32_t imm26 = (uint32_t)instr->imm26;
+
+	cpu->gp_regs[ra] = cpu->pc + 4;
+	cpu->pc = (imm26 * 4) | (cpu->pc & 0xF0000000);
+	return PC_INC_BY_INSTR;
+}
+
+static uint32_t jmpi(struct NIOS_CPU * cpu, uint32_t code)
+{
+	def_j_type_code;
+	cpu->pc = (((uint32_t)(instr->imm26) * 4) & 0xFFFFFFF)| (cpu->pc & 0xF0000000);
+	return PC_INC_BY_INSTR;
+}
+
+#define J_TYPE_HANDLER_COUNT (0x40)
+struct j_type_handler j_type_handlers[J_TYPE_HANDLER_COUNT] = {
+	[CALL] = handler_item(call),
+	[JMPI] = handler_item(jmpi)
+};