insn_call-callcc.v

   1 `ifdef EXECUTE
   2         `INSN_CALL,`INSN_CALLCC: begin
   3                 case (cycle)
   4                 0:      begin
   5                                 `EXEC_INC_PC;
   6                                 `EXEC_NEXTADDR_PCINC;
   7                                 rd <= 1;
   8                         end
   9                 1:      begin
  10                                 `EXEC_INC_PC;
  11                                 `EXEC_NEXTADDR_PCINC;
  12                                 rd <= 1;
  13                         end
  14                 2:      begin
  15                                 `EXEC_INC_PC;
  16                                 if (!opcode[0]) // i.e., is callcc
  17                                         /* We need to check the condition code to bail out. */
  18                                         case (opcode[4:3])
  19                                         `INSN_cc_NZ:    if (registers[`REG_F][7]) begin `EXEC_NEWCYCLE; end
  20                                         `INSN_cc_Z:     if (~registers[`REG_F][7]) begin `EXEC_NEWCYCLE; end
  21                                         `INSN_cc_NC:    if (registers[`REG_F][4]) begin `EXEC_NEWCYCLE; end
  22                                         `INSN_cc_C:     if (~registers[`REG_F][4]) begin `EXEC_NEWCYCLE; end
  23                                         endcase
  24                         end
  25                 3:      begin
  26                                 address <= {registers[`REG_SPH],registers[`REG_SPL]} - 1;
  27                                 wdata <= registers[`REG_PCH];
  28                                 wr <= 1;
  29                         end
  30                 4:      begin
  31                                 address <= {registers[`REG_SPH],registers[`REG_SPL]} - 2;
  32                                 wdata <= registers[`REG_PCL];
  33                                 wr <= 1;
  34                         end
  35                 5:      begin
  36                                 `EXEC_NEWCYCLE; /* do NOT increment the PC */
  37                         end
  38                 endcase
  39         end
  40 `endif
  41
  42 `ifdef WRITEBACK
  43         `INSN_CALL,`INSN_CALLCC: begin
  44                 case (cycle)
  45                 0:      begin /* type F */ end
  46                 1:      tmp <= rdata;   // tmp contains newpcl
  47                 2:      tmp2 <= rdata;  // tmp2 contains newpch
  48                 3:      begin /* type F */ end
  49                 4:      registers[`REG_PCH] <= tmp2;
  50                 5: begin
  51                                 {registers[`REG_SPH],registers[`REG_SPL]} <=
  52                                         {registers[`REG_SPH],registers[`REG_SPL]} - 2;
  53                                 registers[`REG_PCL] <= tmp;
  54                         end
  55                 endcase
  56         end
  57 `endif