When mor1kx receives 'jalr to link register (r9)'
illegal instruction exception should be asserted as in or1ksim, but it doesn't

You can reproduce by inserting 'insn: 0x48004800'

in mor1kx_decode.v, changing as below should fix this.

always @*
 case (opc_insn)
  `OR1K_OPCODE_JALR:
   if (decode_insn_i[`OR1K_RB_SELECT] == 9)
    decode_except_illegal_o = 1'b1;