X-Git-Url: http://git.joshuawise.com/fpgaboy.git/blobdiff_plain/77ab69d7bb0902e6ebf0994159ed2205f8413e34..b057a5d6e6db6db06ae33703ca72cd235eec91d6:/core/insn_push_reg.v

diff --git a/core/insn_push_reg.v b/core/insn_push_reg.v
new file mode 100644
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