build68k.cpp

/*
 * UAE - The Un*x Amiga Emulator
 *
 * Read 68000 CPU specs from file "table68k" and build table68k.c
 *
 * Copyright 1995,1996 Bernd Schmidt
 */

#include "sysconfig.h"
#include "sysdeps.h"

#include <stdlib.h>
#include <tchar.h>
#include <assert.h>
#include <ctype.h>

#define TCHAR char

#include "readcpu.h"

static FILE *tablef;
static int nextch = 0;

static void getnextch(void)
{
    do {
	nextch = fgetc(tablef);
	if (nextch == '%') {
	    do {
		nextch = fgetc(tablef);
	    } while (nextch != EOF && nextch != '\n');
	}
    } while (nextch != EOF && isspace(nextch));
}

static int nextchtohex(void)
{
    switch (isupper (nextch) ? tolower (nextch) : nextch) {
     case '0': return 0;
     case '1': return 1;
     case '2': return 2;
     case '3': return 3;
     case '4': return 4;
     case '5': return 5;
     case '6': return 6;
     case '7': return 7;
     case '8': return 8;
     case '9': return 9;
     case 'a': return 10;
     case 'b': return 11;
     case 'c': return 12;
     case 'd': return 13;
     case 'e': return 14;
     case 'f': return 15;
     default: abort();
    }
}

int main(int argc, char **argv)
{
    int no_insns = 0;

    printf ("#include \"sysconfig.h\"\n");
    printf ("#include \"sysdeps.h\"\n");
    printf ("#include \"readcpu.h\"\n");
    printf ("struct instr_def defs68k[] = {\n");
#if 0
    tablef = fopen("table68k","r");
    if (tablef == NULL) {
	fprintf(stderr, "table68k not found\n");
	exit(1);
    }
#else
    tablef = stdin;
#endif
    getnextch();
    while (nextch != EOF) {
		int cpulevel, uncpulevel, plevel, sduse;
		int i;

		char opcstr[256];
		int bitpos[16];
		int flagset[5], flaguse[5];
		char cflow;

		unsigned int bitmask,bitpattern;
		int n_variable;

		int head = 0, tail = 0, clocks = 0, fetchmode = 0;

		n_variable = 0;
		bitmask = bitpattern = 0;
		memset (bitpos, 0, sizeof(bitpos));
		for(i=0; i<16; i++) {
			int currbit;
			bitmask <<= 1;
			bitpattern <<= 1;

			switch (nextch) {
			 case '0': currbit = bit0; bitmask |= 1; break;
			 case '1': currbit = bit1; bitmask |= 1; bitpattern |= 1; break;
			 case 'c': currbit = bitc; break;
			 case 'C': currbit = bitC; break;
			 case 'f': currbit = bitf; break;
			 case 'i': currbit = biti; break;
			 case 'I': currbit = bitI; break;
			 case 'j': currbit = bitj; break;
			 case 'J': currbit = bitJ; break;
			 case 'k': currbit = bitk; break;
			 case 'K': currbit = bitK; break;
			 case 's': currbit = bits; break;
			 case 'S': currbit = bitS; break;
			 case 'd': currbit = bitd; break;
			 case 'D': currbit = bitD; break;
			 case 'r': currbit = bitr; break;
			 case 'R': currbit = bitR; break;
			 case 'z': currbit = bitz; break;
			 case 'p': currbit = bitp; break;
			 default: abort();
			}
			if (!(bitmask & 1)) {
			bitpos[n_variable] = currbit;
			n_variable++;
			}

			if (nextch == '0' || nextch == '1')
			bitmask |= 1;
			if (nextch == '1')
			bitpattern |= 1;
			getnextch();
		}

		while (isspace(nextch) || nextch == ':') /* Get CPU level, unimplemented level, and privilege level */
			getnextch();

		switch (nextch) {
		 case '0': cpulevel = 0; break;
		 case '1': cpulevel = 1; break;
		 case '2': cpulevel = 2; break;
		 case '3': cpulevel = 3; break;
		 case '4': cpulevel = 4; break;
		 case '5': cpulevel = 5; break;
		 case '6': cpulevel = 6; break;
		 case '7': cpulevel = 7; break;
		 default: abort();
		}
		getnextch();

		switch (nextch) {
		 case '0': uncpulevel = 0; break;
		 case '1': uncpulevel = 1; break;
		 case '2': uncpulevel = 2; break;
		 case '3': uncpulevel = 3; break;
		 case '4': uncpulevel = 4; break;
		 case '5': uncpulevel = 5; break;
		 case '6': uncpulevel = 6; break;
		 case '7': uncpulevel = 7; break;
		 default: abort();
		}
		getnextch();

		switch (nextch) {
		 case '0': plevel = 0; break;
		 case '1': plevel = 1; break;
		 case '2': plevel = 2; break;
		 case '3': plevel = 3; break;
		 default: abort();
		}
		getnextch();

		while (isspace(nextch))                   /* Get flag set information */
			getnextch();

		if (nextch != ':')
			abort();

		for(i = 0; i < 5; i++) {
			getnextch();
			switch(nextch){
			 case '-': flagset[i] = fa_unset; break;
			 case '/': flagset[i] = fa_isjmp; break;
			 case '+': flagset[i] = fa_isbranch; break;
			 case '0': flagset[i] = fa_zero; break;
			 case '1': flagset[i] = fa_one; break;
			 case 'x': flagset[i] = fa_dontcare; break;
			 case '?': flagset[i] = fa_unknown; break;
			 default: flagset[i] = fa_set; break;
			}
		}

		getnextch();
		while (isspace(nextch))
			getnextch();

		if (nextch != ':')                        /* Get flag used information */
			abort();

		for(i = 0; i < 5; i++) {
			getnextch();
			switch(nextch){
			 case '-': flaguse[i] = fu_unused; break;
			 case '/': flaguse[i] = fu_isjmp; break;
			 case '+': flaguse[i] = fu_maybecc; break;
			 case '?': flaguse[i] = fu_unknown; break;
			 default: flaguse[i] = fu_used; break;
			}
		}

		getnextch();
		while (isspace(nextch))
			getnextch();

		if (nextch != ':')                        /* Get control flow information */
			abort();

		cflow = 0;
		for (i = 0; i < 2; i++) {
			getnextch();
			switch (nextch) {
			case '-': break;
			case 'R': cflow |= fl_return; break;
			case 'B': cflow |= fl_branch; break;
			case 'J': cflow |= fl_jump; break;
			case 'T': cflow |= fl_trap; break;
			default: abort();
			}
		}

		getnextch();
		while (isspace(nextch))
			getnextch();

		if (nextch != ':')                        /* Get source/dest usage information */
			abort();

		getnextch();
		sduse = nextchtohex() << 4;
		getnextch();
		sduse |= nextchtohex();

		getnextch();
		while (isspace(nextch))
			getnextch();

		if (nextch != ':')
			abort();

		if (fgets(opcstr, 250, tablef) != opcstr) {
			abort();
		}
		getnextch();

		if (nextch == '-') {
			int neg;
			char fm[20];
			getnextch();
			while (isspace(nextch))
				getnextch();
			neg = 1;
			if (nextch == '-') {
				neg = -1;
				getnextch();
			}
			for (;;) {
				if (nextch < '0' || nextch > '9')
					break;
				head *= 10;
				head += nextch - '0';
				nextch = fgetc (tablef);
			}
			head *= neg;
			while (isspace(nextch))
				getnextch();
			for (;;) {
				if (nextch < '0' || nextch > '9')
					break;
				tail *= 10;
				tail += nextch - '0';
				nextch = fgetc (tablef);
			}
			while (isspace(nextch))
				getnextch();
			for (;;) {
				if (nextch < '0' || nextch > '9')
					break;
				clocks *= 10;
				clocks += nextch - '0';
				nextch = fgetc (tablef);
			}
			if (nextch == ' ') {
				if (fgets(fm, sizeof fm, tablef) != fm) {
					abort();
				}
				if (!strnicmp(fm, "fea", 3))
					fetchmode = 1;
				if (!strnicmp(fm, "cea", 3))
					fetchmode = 2;
				if (!strnicmp(fm, "fiea", 4))
					fetchmode = 3;
				if (!strnicmp(fm, "ciea", 4))
					fetchmode = 4;
				if (!strnicmp(fm, "jea", 3))
					fetchmode = 5;
			}
			getnextch();
		}

		int j;
		/* Remove superfluous spaces from the string */
		char *opstrp = opcstr, *osendp;
		char tmp[100], *p;
		int slen = 0;

		while (isspace((unsigned char)*opstrp))
			opstrp++;

		osendp = opstrp;
		while (*osendp) {
			if (!isspace ((unsigned char)*osendp))
				slen = osendp - opstrp + 1;
			osendp++;
		}
		opstrp[slen] = 0;

		if (no_insns > 0)
			printf(",\n");
		no_insns++;
		strcpy (tmp, opstrp);
		strcat (tmp, " ");
		p = tmp;
		while (!isspace((unsigned char)*p++));
		*p = 0;
		printf("/* %s */\n", tmp);
		printf("{0x%04X,%2d,{", bitpattern, n_variable);
		for (j = 0; j < 16; j++) {
			printf("%2d", bitpos[j]);
			if (j < 15)
				printf(",");
		}
		printf ("},0x%04X,%d,%d,%d,{", bitmask, cpulevel, uncpulevel, plevel);
		for(i = 0; i < 5; i++) {
			printf("{%d,%d}%s", flaguse[i], flagset[i], i == 4 ? "" : ",");
		}
		printf("},0x%02x,0x%02x,_T(\"%s\"),%2d,%2d,%2d,%2d}", cflow, sduse, opstrp, head, tail, clocks, fetchmode);
    }
    printf("};\nint n_defs68k = %d;\n", no_insns);
    return 0;
}