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maketables.c
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/* maketables.c
* Instructions and flags tables generator.
*
* Copyright (c) 2012 Lin Ke-Fong
*
* This program is free, do whatever you want with it.
*/
#include <stdio.h>
#include <stdlib.h>
#include "z80emu.h"
/* Encoding for indirect or indexed 8-bit memory operands. */
#define INDIRECT_HL 0x06
static void make_instruction_table (void);
static void make_cb_instruction_table (void);
static void make_ed_instruction_table (void);
static void make_szyx_flags_table (void);
static void make_szyxp_flags_table (void);
int main (void)
{
printf("/* Generated file, see maketables.c. */\n\n");
make_instruction_table();
putchar('\n');
make_cb_instruction_table();
putchar('\n');
make_ed_instruction_table();
putchar('\n');
make_szyx_flags_table();
putchar('\n');
make_szyxp_flags_table();
return EXIT_SUCCESS;
}
/* Make single opcodes instruction table. */
static void make_instruction_table (void)
{
int i, j, k;
char *s, *t;
static char *accumulator_operations[8] = {
"ADD",
"ADC",
"SUB",
"SBC",
"AND",
"XOR",
"OR",
"CP",
};
printf("static const unsigned char INSTRUCTION_TABLE[256] = {\n\n");
for (k = 0; k < (1 << 6); k++) {
putchar('\t');
i = k >> 3;
j = k & 0x07;
switch (j) {
/* Various opcodes. */
case 0x00: {
static char *strings[8] = {
"NOP",
"EX_AF_AF_PRIME",
"DJNZ_E",
"JR_E",
"JR_DD_E",
"JR_DD_E",
"JR_DD_E",
"JR_DD_E",
};
s = strings[i];
break;
}
/* LD_RR_NN and ADD_HL_RR. */
case 0x01: {
s = i & 1 ? "ADD_HL_RR" : "LD_RR_NN";
break;
}
/* Indirect loading. */
case 0x02: {
static char *strings[8] = {
"LD_INDIRECT_BC_A",
"LD_A_INDIRECT_BC",
"LD_INDIRECT_DE_A",
"LD_A_INDIRECT_DE",
"LD_INDIRECT_NN_HL",
"LD_HL_INDIRECT_NN",
"LD_INDIRECT_NN_A",
"LD_A_INDIRECT_NN",
};
s = strings[i];
break;
}
/* 16-bit INC and DEC. */
case 0x03: {
s = i & 1 ? "DEC_RR" : "INC_RR";
break;
}
/* 8-bit INC and DEC. */
case 0x04:
case 0x05: {
if (j == 0x04)
printf("INC_");
else
printf("DEC_");
if (i == INDIRECT_HL)
s = "INDIRECT_HL";
else
s = "R";
break;
}
/* Immediate 8-bit loading. */
case 0x06: {
if (i == INDIRECT_HL)
s = "LD_INDIRECT_HL_N";
else
s = "LD_R_N";
break;
}
/* RLCA, RRCA, RLA, RRA, DAA, CPL, SCF, and CCF. */
case 0x07:
default: {
static char *strings[8] = {
"RLCA",
"RRCA",
"RLA",
"RRA",
"DAA",
"CPL",
"SCF",
"CCF",
};
s = strings[i];
break;
}
}
printf("%s,\n", s);
if (j == 0x07)
putchar('\n');
}
/* 8-bit loading and HALT. */
for (k = 0; k < (1 << 6); k++) {
i = k >> 3;
j = k & 0x07;
if (i == j) {
if (i == INDIRECT_HL)
s = "HALT";
else
s = "NOP";
printf("\t%s,\n", s);
} else {
if (i == INDIRECT_HL)
s = "LD_INDIRECT_HL_";
else
s = "LD_R_";
if (j == INDIRECT_HL)
t = "INDIRECT_HL";
else
t = "R";
printf("\t%s%s,\n", s, t);
}
if (j == 0x07)
putchar('\n');
}
/* Operation on accumulator and register/memory. */
for (i = 0; i < (1 << 3); i++) {
s = accumulator_operations[i];
for (j = 0; j < (1 << 3); j++) {
printf("\t%s_", s);
if (j == INDIRECT_HL)
t = "INDIRECT_HL";
else
t = "R";
printf("%s,\n", t);
}
putchar('\n');
}
for (k = 0; k < (1 << 6); k++) {
putchar('\t');
i = k >> 3;
j = k & 0x07;
switch (j) {
/* RET CC. */
case 0x00: s = "RET_CC"; break;
/* POP_SS, RET, EXX, JP_HL, and LD_SP_HL. */
case 0x01: {
if (i & 1) {
static char *strings[4] = {
"RET",
"EXX",
"JP_HL",
"LD_SP_HL",
};
s = strings[i >> 1];
} else
s = "POP_SS";
break;
}
/* JP CC, NN. */
case 0x02: s = "JP_CC_NN"; break;
/* Various opcodes. */
case 0x03: {
static char *strings[8] = {
"JP_NN",
"CB_PREFIX",
"OUT_N_A",
"IN_A_N",
"EX_INDIRECT_SP_HL",
"EX_DE_HL",
"DI",
"EI",
};
s = strings[i];
break;
}
/* CALL_CC_NN. */
case 0x04: s = "CALL_CC_NN"; break;
/* PUSH_SS, CALL_NN, and prefixes. */
case 0x05: {
if (i & 1) {
static char *strings[4] = {
"CALL_NN",
"DD_PREFIX",
"ED_PREFIX",
"FD_PREFIX",
};
s = strings[i >> 1];
} else
s = "PUSH_SS";
break;
}
/* Operation on accumulator and immediate. */
case 0x06: {
printf("%s", accumulator_operations[i]);
s = "_N";
break;
}
/* RST_P. */
case 0x07:
default: s = "RST_P"; break;
}
printf("%s,\n", s);
if (j == 0x07)
putchar('\n');
}
printf("};\n");
}
/* Make 0xcb prefixed opcodes instruction table. */
static void make_cb_instruction_table (void)
{
int i;
char *s;
printf("static const unsigned char CB_INSTRUCTION_TABLE[256] = {\n\n");
/* Rotation/shift operations. */
for (i = 0; i < (1 << 6); i++) {
static char *rotation_shift_operations[8] = {
"RLC",
"RRC",
"RL",
"RR",
"SLA",
"SRA",
"SLL",
"SRL",
};
printf("\t%s_", rotation_shift_operations[i >> 3]);
if ((i & 0x07) == INDIRECT_HL)
s = "INDIRECT_HL";
else
s = "R";
printf("%s,\n", s);
if ((i & 0x07) == 0x07)
putchar('\n');
}
/* BIT_B_R and BIT_B_INDIRECT_HL. */
for (i = 0; i < (1 << 6); i++) {
if ((i & 0x07) == INDIRECT_HL)
s = "BIT_B_INDIRECT_HL";
else
s = "BIT_B_R";
printf("\t%s,\n", s);
if ((i & 0x07) == 0x07)
putchar('\n');
}
/* RES_B_R and RES_B_INDIRECT_HL. */
for (i = 0; i < (1 << 6); i++) {
if ((i & 0x07) == INDIRECT_HL)
s = "RES_B_INDIRECT_HL";
else
s = "RES_B_R";
printf("\t%s,\n", s);
if ((i & 0x07) == 0x07)
putchar('\n');
}
/* SET_B_R and SET_B_INDIRECT_HL. */
for (i = 0; i < (1 << 6); i++) {
if ((i & 0x07) == INDIRECT_HL)
s = "SET_B_INDIRECT_HL";
else
s = "SET_B_R";
printf("\t%s,\n", s);
if ((i & 0x07) == 0x07)
putchar('\n');
}
printf("};\n");
}
/* Make 0xed prefixed opcodes instruction table. */
static void make_ed_instruction_table (void)
{
int i, j, k;
char *s, *t;
printf("static const unsigned char ED_INSTRUCTION_TABLE[256] = {\n\n");
/* Undefined opcodes are catched and will execute as NOPs. */
for (i = 0; i < (1 << 6); i++) {
printf("\tED_UNDEFINED,\n");
if ((i & 0x07) == 0x07)
putchar('\n');
}
/* 0xed prefixed opcodes. */
for (k = 0; k < (1 << 6); k++) {
i = k >> 3;
j = k & 0x07;
switch (j) {
case 0x00:
case 0x01: {
s = j ? "OUT_C_R" : "IN_R_C";
t = "";
break;
}
/* SBC_HL_RR and ADC_HL_RR. */
case 0x02: {
s = i & 1 ? "ADC" : "SBC";
t = "_HL_RR";
break;
}
/* LD_INDIRECT_NN_RR and LD_RR_INDIRECT_NN. */
case 0x03: {
s = "LD_";
t = i & 1
? "RR_INDIRECT_NN"
: "INDIRECT_NN_RR";
break;
}
/* NEG and IM_N. */
case 0x04:
case 0x06: {
s = j == 0x04 ? "NEG" : "IM_N";
t = "";
break;
}
/* RETN and RETI. */
case 0x05: {
s = "RETI_RETN";
t = "";
break;
}
/* Various opcodes. */
case 0x07:
default: {
static char *strings[8] = {
"LD_I_A_LD_R_A",
"LD_I_A_LD_R_A",
"LD_A_I_LD_A_R",
"LD_A_I_LD_A_R",
"RLD_RRD",
"RLD_RRD",
"ED_UNDEFINED",
"ED_UNDEFINED",
};
s = strings[i];
t = "";
break;
}
}
printf("\t%s%s,\n", s, t);
if ((j & 0x07) == 0x07)
putchar('\n');
}
/* Block instructions opcodes. */
for (k = 0; k < (1 << 6); k++) {
static char *strings[4][4] = {
{
"LDI_LDD",
"CPI_CPD",
"INI_IND",
"OUTI_OUTD",
},
{
"LDI_LDD",
"CPI_CPD",
"INI_IND",
"OUTI_OUTD",
},
{
"LDIR_LDDR",
"CPIR_CPDR",
"INIR_INDR",
"OTIR_OTDR",
},
{
"LDIR_LDDR",
"CPIR_CPDR",
"INIR_INDR",
"OTIR_OTDR",
},
};
i = k >> 3;
j = k & 0x07;
if (i < 4 || j > 3)
s = "ED_UNDEFINED";
else
s = strings[i - 4][j];
printf("\t%s, \n", s);
if ((j & 0x07) == 0x07)
putchar('\n');
}
for (i = 0; i < (1 << 6); i++) {
printf("\tED_UNDEFINED,\n");
if ((i & 0x07) == 0x07)
putchar('\n');
}
printf("};\n");
}
/* Make S, Z, Y, and X flags table. */
static void make_szyx_flags_table (void)
{
int i;
printf("static const unsigned char SZYX_FLAGS_TABLE[256] = {\n");
for (i = 0; i < 256; i++) {
int r;
r = i & (Z80_S_FLAG | Z80_Y_FLAG | Z80_X_FLAG);
r |= !i ? Z80_Z_FLAG : 0;
if (!(i & 7))
printf("\n\t0x%02x, ", r);
else
printf("0x%02x, ", r);
}
printf("\n\n};\n");
}
/* Make S, Z, Y, X, and P flags table. */
static void make_szyxp_flags_table (void)
{
int i;
printf("static const unsigned char SZYXP_FLAGS_TABLE[256] = {\n");
for (i = 0; i < 256; i++) {
int j, p, r;
j = i;
p = !0;
while (j) {
if (j & 1)
p = !p;
j >>= 1;
}
r = i & (Z80_S_FLAG | Z80_Y_FLAG | Z80_X_FLAG);
r |= !i ? Z80_Z_FLAG : 0;
r |= p ? Z80_PV_FLAG : 0;
if (!(i & 7))
printf("\n\t0x%02x, ", r);
else
printf("0x%02x, ", r);
}
printf("\n\n};\n");
}