Move the core to core/

[fpgaboy.git] / core / insn_push_reg.v

diff --git a/core/insn_push_reg.v b/core/insn_push_reg.v
new file mode 100644 (file)
index 0000000..6b789e5
--- /dev/null
+++ b/core/insn_push_reg.v
@@ -0,0 +1,34 @@
+`ifdef EXECUTE
+       `INSN_PUSH_reg: begin   /* PUSH is 16 cycles! */
+               case (cycle)
+               0:      case (opcode[5:4])
+                       `INSN_stack_AF: `EXEC_WRITE(`_SP - 1, `_A)
+                       `INSN_stack_BC: `EXEC_WRITE(`_SP - 1, `_B)
+                       `INSN_stack_DE: `EXEC_WRITE(`_SP - 1, `_D)
+                       `INSN_stack_HL: `EXEC_WRITE(`_SP - 1, `_H)
+                       endcase
+               1:      case (opcode[5:4])
+                       `INSN_stack_AF: `EXEC_WRITE(`_SP - 2, `_F)
+                       `INSN_stack_BC: `EXEC_WRITE(`_SP - 2, `_C)
+                       `INSN_stack_DE: `EXEC_WRITE(`_SP - 2, `_E)
+                       `INSN_stack_HL: `EXEC_WRITE(`_SP - 2, `_L)
+                       endcase
+               2:      begin /* Twiddle thumbs. */ end
+               3:      begin
+                               `EXEC_NEWCYCLE
+                               `EXEC_INC_PC
+                       end
+               endcase
+       end
+`endif
+
+`ifdef WRITEBACK
+       `INSN_PUSH_reg: begin   /* PUSH is 16 cycles! */
+               case (cycle)
+               0:      begin /* type F */ end
+               1:      begin /* type F */ end
+               2:      begin /* type F */ end
+               3:      `_SP <= `_SP - 2;
+               endcase
+       end
+`endif