From 67cba5bf12d5e1be47e371f10cf0267a58cebb87 Mon Sep 17 00:00:00 2001
From: Donald Sebastian Leung <dl@m-labs.hk>
Date: Fri, 31 Jul 2020 14:06:55 +0800
Subject: [PATCH] Add JAL instruction

---
 insns/insn_jal.py | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)
 create mode 100644 insns/insn_jal.py

diff --git a/insns/insn_jal.py b/insns/insn_jal.py
new file mode 100644
index 0000000..c95cb14
--- /dev/null
+++ b/insns/insn_jal.py
@@ -0,0 +1,20 @@
+from insn_UJ import *
+
+class rvfi_insn_jal(rvfi_insn_UJ):
+    def __init__(self):
+        super(rvfi_insn_jal, self).__init__()
+    def ports(self):
+        return super(rvfi_insn_jal, self).ports()
+    def elaborate(self, platform):
+        m = super(rvfi_insn_jal, self).elaborate(platform)
+
+        # JAL instruction
+        next_pc = Signal(32)
+        m.d.comb += next_pc.eq(self.rvfi_pc_rdata + self.insn_imm)
+        m.d.comb += self.spec_valid.eq(self.rvfi_valid & (~self.insn_padding) & (self.insn_opcode == 0b1101111))
+        m.d.comb += self.spec_rd_addr.eq(self.insn_rd)
+        m.d.comb += self.spec_rd_wdata.eq(Mux(self.spec_rd_addr, self.rvfi_pc_rdata + 4, 0))
+        m.d.comb += self.spec_pc_wdata.eq(next_pc)
+        m.d.comb += self.spec_trap.eq(Mux(self.ialign16, next_pc[0] != 0, next_pc[:2] != 0) | ~self.misa_ok)
+
+        return m