added code for parity table

tools/generate_z80_tables.cc

@@ -0,0 +1,148 @@
+//
+// Utility to generate various tables for the Z80 emulation
+//
+
+#include "common.h"
+
+#include <unistd.h>
+
+#include <cstdio>
+#include <fstream>
+#include <iomanip>
+
+//
+// Command line settings
+//
+
+std::string CMD_outFile = "out.s";
+
+//
+// Common helper functions
+//
+
+void printUsage()
+{
+    std::cout << "\n" <<
+        "usage: generate_z80_tables [-o <out file>]" << "\n\n";
+}
+
+void printBanner()
+{
+    printBannerLineTop();
+    std::cout << "// Generating Z80 emulation tables" << "\n";
+    printBannerLineBottom();
+}
+
+//
+// Top-level functions
+//
+
+void parseCommandLine(int argc, char **argv)
+{
+    int opt;
+
+    // Retrieve command line options
+
+    while ((opt = getopt(argc, argv, "o:")) != -1)
+    {
+        switch(opt)
+        {
+            case 'o': CMD_outFile   = optarg; break;
+            default: printUsage(); ERROR();
+        }
+    }
+}
+
+//
+// Constants generation
+//
+
+std::string generateParityTable(void)
+{
+	std::string outStr = "!macro PUT_Z80_TABLE_PARITY {\n";;
+
+	for (uint16_t idx = 0; idx < 0x100; idx++)
+	{
+		std::string idxInBin = "";
+
+		bool even = false;
+		for (uint16_t bit = 128; bit != 0; bit /= 2)
+		{
+			if ((idx & bit) != 0)
+			{
+				idxInBin += "1";
+                even = !even;
+			}
+			else
+			{
+				idxInBin += "0";			
+			}
+		}
+
+		if (even)
+		{
+			outStr += std::string("\t!byte %00000100 ; ") + idxInBin + "\n";
+		}
+		else
+		{
+			outStr += std::string("\t!byte %00000000 ; ") + idxInBin + "\n";
+		}
+	}
+
+	return outStr + "}\n\n\n";;
+} 
+
+std::string generateDaaTables()
+{
+	std::string outStr;
+
+	// iterate by SF, HF, CF flags
+
+	// XXX
+	// Check code by Rui Ribeiro, see https://stackoverflow.com/questions/8119577/z80-daa-instruction
+
+	return outStr;
+}
+
+void writeTables()
+{
+    // Remove old file
+
+    unlink(CMD_outFile.c_str());
+
+    // Open output file for writing
+
+    std::ofstream outFile(CMD_outFile, std::fstream::out | std::fstream::trunc);
+    if (!outFile.good()) ERROR(std::string("can't open oputput file '") + CMD_outFile + "'");
+
+    // Write header
+
+    outFile << "//\n// Generated file - do not edit\n//\n\n";
+
+    // Write tables
+
+	outFile << generateParityTable();
+	outFile << generateDaaTables();
+
+	// XXX
+
+    // Close the file
+   
+    outFile.close();
+
+    std::cout << std::string("Z80 emulation tables written to: ") + CMD_outFile + "\n\n";
+}
+
+//
+// Main function
+//
+
+int main(int argc, char **argv)
+{
+    parseCommandLine(argc, argv);
+
+    printBanner();
+    writeTables();
+
+    return 0;
+}