Add JALR instruction

insns/insn_jalr.py

@@ -0,0 +1,20 @@
+from insn_I import *
+
+class rvfi_insn_jalr(rvfi_insn_I):
+    def __init__(self):
+        super(rvfi_insn_jalr, self).__init__()
+    def ports(self):
+        return super(rvfi_insn_jalr, self).ports()
+    def elaborate(self, platform):
+        m = super(rvfi_insn_jalr, self).elaborate(platform)
+
+        next_pc = Signal(32)
+        m.d.comb += next_pc.eq((self.rvfi_rs1_rdata + self.insn_imm) & ~1)
+        m.d.comb += self.spec_valid.eq(self.rvfi_valid & (~self.insn_padding) & (self.insn_funct3 == 0b000) & (self.insn_opcode == 0b1100111))
+        m.d.comb += self.spec_rs1_addr.eq(self.insn_rs1)
+        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