mirror of
https://github.com/RevCurtisP/C02.git
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Updated and Debugged A02 Assembler
This commit is contained in:
Curtis F Kaylor
parent
f94ddd63fc
commit
18088691d7
158
a02.c
158
a02.c
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@ -18,9 +18,9 @@ int orgadr; //Origin Address
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int curadr; //Current Address
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int lstadr; //List Address
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struct sym {int block; char name[MAXSYM]; int bytes, value;};
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struct sym {int block; char name[MAXLBL+1]; int bytes, value;};
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struct sym symbol; //Current Symbol
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struct sym symtbl[MAXGLB]; //Global Symbol Table
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struct sym symtbl[MAXSYM]; //Global Symbol Table
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int symcnt; //Number of Global Labels
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int blknum; //Local Label Block Number (0 = Global)
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@ -43,14 +43,17 @@ char *linptr; //Pointer into Input Buffer
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int lineno; //Input File Line Number
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int opridx; //Index into Operand
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int passno; //Assembler Pass Number (1 or 2)
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int savlno; //Line Number (Saved)
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char prgnam[256]; //Assembler Path and Name (from Command Line)
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char inpnam[256]; //Input File Name
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char outnam[256]; //Output File Name
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char lstnam[256]; //List File Name
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char incnam[256]; //Include File Name
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FILE *inpfil; //Input File Pointer
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FILE *outfil; //Output File Pointer
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FILE *lstfil; //List File Pointer
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FILE *incfil; //Include File Pointer
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/* Print Error Message and Exit */
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void xerror(char* format, char *s) {
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@ -59,6 +62,14 @@ void xerror(char* format, char *s) {
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exit(EXIT_FAILURE);
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}
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/* Open File with Error Checking */
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FILE * opnfil(char* name, char* mode) {
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if (DEBUG) printf("Opening file '%s' with mode '%s'\n", name, mode);
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FILE *fp = fopen(name, mode);
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if (!fp) xerror("Error Opening File '%s'\n", name);
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return fp;
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}
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/* Skip Character in Input Line *
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* Args: c - Character to Skip *
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* Updates: linptr */
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@ -81,7 +92,7 @@ void skpspc(void) {
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int pword(int skip, char* word) {
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int wrdlen = 0;
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if (skip) skpspc();
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while (isalnum(*linptr)) {
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while (isalnum(*linptr) || *linptr == '_') {
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word[wrdlen++] = toupper(*linptr);
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linptr++;
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}
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@ -122,6 +133,7 @@ int plabel(void) {
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if (label[0] && fndsym(block, label)) xerror("Duplicate Label %s Encountered\n", label);
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if (DEBUG) printf("Initializing Symbol %s\n", label);
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symbol.block = block;
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if (strlen(label) > MAXLBL) xerror("Label %s Too Long\n", label);
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strcpy(symbol.name, label);
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setsym(curadr, 0);
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}
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@ -135,7 +147,8 @@ int plabel(void) {
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/* Copy Character to Operand and Increment */
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int cpychr(int c) {
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if (c && toupper(*linptr) != c) return FALSE;
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oprnd[opridx++] = toupper(*linptr++);
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if (opridx < MAXSTR) oprnd[opridx++] = toupper(*linptr);
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linptr++;
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return TRUE;
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}
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@ -189,7 +202,7 @@ struct sym *evlsym() {
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char name[MAXSTR];
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int block = (cpychr('.')) ? blknum : 0;
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pword(TRUE, name);
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for (int i=0; name[i]; i++) oprnd[opridx++] = name[i];
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for (int i=0; name[i]; i++) if (opridx<MAXSTR) oprnd[opridx++] = name[i];
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struct sym *result = fndsym(block, name);
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if (passno == 2 && result == NULL) xerror("Undefined Symbol %s\n", name);
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return result;
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@ -252,7 +265,7 @@ void outbyt(int b) {
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if (passno != 2) return;
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fputc(b & 0xFF, outfil);
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sprintf(bytstr, "%02X ", b);
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strcat(mcode, bytstr);
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if (strlen(mcode) < 9) strcat(mcode, bytstr);
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}
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/* Write Word to Output File */
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@ -263,6 +276,7 @@ void outwrd(int w) {
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/* Assemble BYTE Pseudo-Op */
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void asmbyt(void) {
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if (DEBUG) puts("Assembling BYTE Pseudo-Op");
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do {
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if (cpychr('"')) { //String Operand
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while (!cpychr('"')) {outbyt(*linptr); cpychr(0); }
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@ -279,6 +293,14 @@ void asmwrd(void) {
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} while (cpychr(','));
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}
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/* Assemble FILL Pseudo-Op */
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void asmfll(void) {
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if (DEBUG) puts("Assembling FILL Pseudo-Op");
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int size = evlopd(0xFFFF);
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if (DEBUG) printf("Filling %d Bytes\n", size);
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for (int i=0; i<size; i++) outbyt(0);
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}
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/* Assemble EQU Pseudo-Op */
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void asmequ(void) {
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if (label[0] == 0) xerror("EQUate without Label", 0);
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@ -288,14 +310,14 @@ void asmequ(void) {
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/* Assemble ORG Pseudo-Op */
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void asmorg(void) {
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orgadr = evlopd(0xFFFF);
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curadr = orgadr;
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lstadr = orgadr;
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if (passno == 1 && symbol.name[0]) {
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symbol.value = orgadr;
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symbol.bytes = 2;
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}
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if (passno == 2 && objtyp == PRGFIL)
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outwrd(orgadr);
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curadr = orgadr;
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lstadr = orgadr;
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}
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/* Assemble PROCESSOR Pseudo-Op */
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@ -312,39 +334,50 @@ void asmsub(void) {
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if (DEBUG) printf("Block Number set to %s\n", oprnd);
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}
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/* Assemble FILL Pseudo-Op */
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void asmfll(void) {
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int size = evlopd(0xFFFF);
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for (int i=0; i<size; i++) {
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if (passno == 2) outbyt(0);
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curadr++;
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/* Assemble INCLUDE Pseudo-Op */
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void asminf(void) {
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int incidx = 0;
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if (DEBUG) puts("Assembling INCLUDE Pseudo-Op");
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if (incfil) xerror("Nested INCLUDE not Allowed", "");
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if (!cpychr('"')) xerror("File Name Must be Quoted", "");
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printf("%d: '%c'\n", linptr, *linptr);
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while (*linptr && !cpychr('"')) {
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char c = *linptr; if (c == '/') c = '\\'; //Reverse Slashes for DOS/Windows
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incnam[incidx++] = c;
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cpychr(0);
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}
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incnam[incidx] = 0; //Terminate Include Name
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if (incidx == 0) xerror("INCLUDE requires file name\n", "");
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if (DEBUG) printf("Include File Set to Name to ''\n", incnam);
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}
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/* Assemble Pseudo-Op */
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int asmpso(void) {
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if (DEBUG) printf("Assembling Pseudo-Op Token '%c'\n", token);
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if (lkpopc(psolst) == FALSE) return FALSE;
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skpspc();
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if (DEBUG) printf("Assembling Pseudo-Op %s, Token '%c'\n", mnmnc, token);
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switch (token) {
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case '=': asmequ(); break; //EQU
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case 'B': asmbyt(); break; //BYTE
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case 'W': asmwrd(); break; //WORD
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case 'F': asmfll(); break; //FILL
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case 'S': asmsub(); break; //SUBROUTINE
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case 'S': asmsub(); break; //SUBRoutine
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case 'I': asminf(); break; //INCLude
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case '*': asmorg(); break; //ORG
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case 'P': asmprc(); break; //PROCESSOR
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case 'P': asmprc(); break; //PROCessor
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default: xerror("Undefined Pseudo-Op %s\n", mnmnc);
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}
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return TRUE;
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}
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/* Lookup Opcode */
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int lkpopc(struct opc opclst[]) {
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if (DEBUG) printf("Looking for OpCode %s\n", mnmnc);
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char mne[4]; strncpy(mne, mnmnc, 3); //Truncate Mnemonic to Three Characters
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for (int i=0; opclst[i].name[0]; i++) {
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if (strcmp(opclst[i].name, mne)) continue;
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token = opclst[i].token;
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amode = opclst[i].amode;
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int lkpopc(struct opc opl[]) {
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if (DEBUG) printf("Looking up Mnemonic %s\n", mnmnc);
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char mne[5]; strncpy(mne, mnmnc, 4); mne[4] = 0; //Truncate Mnemonic to Four Characters
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for (int i=0; opl[i].name[0]; i++) {
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if (strcmp(opl[i].name, mne)) continue;
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token = opl[i].token;
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amode = opl[i].amode;
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if (DEBUG) printf("Found token %02X, amode %04X\n", token, amode);
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return TRUE;
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}
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@ -353,8 +386,12 @@ int lkpopc(struct opc opclst[]) {
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/* Check for Valid Addressing Mode */
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int chkmod(int mode) {
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char* s = NULL; //Pointer to Addressing Mode Description
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for (int i=0; amdesc[i].amode; i++)
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if (amdesc[i].amode == mode) {s = amdesc[i].desc; break;}
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if (DEBUG) printf("Checking Addressing Mode %s, %04X against %04X\n", s, mode, amode);
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if (mode & amode) return TRUE;
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xerror("Invalid Addressing Mode", "");
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xerror("Invalid Addressing Mode %s", s);
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}
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/* Assemble Branch Opcode */
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@ -377,6 +414,7 @@ void asmbrn(void) {
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/* Assemble Immediate Mode Instruction */
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void asmimd(void) {
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if (DEBUG) printf("Assembling Immediate Opcode Token 0x%02X\n", token);
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opval = evlopd(0xFF);
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zpage = TRUE;
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opmod = 0x08; //Immediate
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@ -404,6 +442,7 @@ void asmiaz(void) {
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if (chkmod(ACMLT)) opmod = 0x08; //Accumulator
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return;
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}
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if (DEBUG) printf("Assembling Absolute/ZeroPage 0x%02X\n", token);
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zpage = (opval <= 0xff) ? TRUE : FALSE;
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if (zpage && chkmod(ZPAGE)) opmod = 0x04; //ZeroPage
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else if (chkmod(ABSLT)) opmod = 0x0C; //Absolute
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@ -428,18 +467,42 @@ unsigned char fixopc(void) {
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return token + opmod;
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}
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/* Ouput Opcode Debug Info */
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void dbgopc(void) {
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if (DEBUG) printf("token=$%02X, opmod=$%02X, Address Mode: ", token, opmod);
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switch (opmod) {
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case 0x00: if (amode == IMPLD) puts("Implied"); else puts("(Indirect,X)"); break;
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case 0x08: if (opval < 0) puts("Accumulator"); else puts("#Immediate"); break;
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case 0x10: puts("(Indirect),Y"); break;
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case 0x11: puts("(Indirect)"); break;
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case 0x04: puts("ZeroPage"); break;
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case 0x0C: puts("Absolute"); break;
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case 0x14: puts("ZeroPage,X"); break;
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case 0x1C: puts("Absolute,X"); break;
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case 0x14: puts("ZeroPage,Y"); break;
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case 0x18: puts("Absolute,Y"); break;
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default: puts("UNKOWN");
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}
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if (opval < 0) puts("No Operand");
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else {
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printf("Operand Value %d, ", opval);
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if (zpage) puts("Zero Page"); else puts("Absolute");
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}
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}
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/* Assemble Opcode */
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int asmopc(void) {
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opmod = 0;
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if (asmpso()) return TRUE; //Check For/Assemble Pseudo-Op
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if (lkpopc(opclst) == FALSE) xerror("Invalid Mnemonic %s\n", mnmnc);
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if (DEBUG) printf("Assembling Opcode Token 0x%02X\n", token);
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if (DEBUG) printf("Assembling Opcode Token 0x%02X, ", token);
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if (DEBUG) printf("Addressing Mode Mask 0x%04X\n", amode);
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skpspc();
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if (amode == 0) return asmpso(); //Pseudo-Op
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else if (amode == RELTV) asmbrn(); //Branch (Relative) Instruction
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if (amode == RELTV) asmbrn(); //Branch (Relative) Instruction
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else if (cpychr('#')) asmimd(); //Assemble Implied Instruction
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else if (cpychr('(')) asmind(); //Assemble Indirect Instruction
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else asmiaz(); //Assemble Implied/Accumulator/Absolute/ZeroPage Instruction
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if (DEBUG) dbgopc();
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int opcode = fixopc();
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if (DEBUG) printf("Writing OpCode $%02X\n", opcode);
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outbyt(opcode);
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@ -480,6 +543,26 @@ void addsym() {
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memcpy(&symtbl[symcnt++], &symbol, sizeof(symbol));
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}
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/* Open Include File */
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void opninc(void) {
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if (DEBUG) printf("Opening Include File %s\n", incnam);
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if (lstfil) fputs("\n", lstfil);
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incfil = opnfil(incnam, "r");
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savlno = lineno;
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lineno = 1;
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}
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/* Close Include File */
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void clsinc(void) {
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if (DEBUG) printf("Closing Include File %s\n", incnam);
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if (lstfil) fputs("\n", lstfil);
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fclose(incfil);
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incfil = NULL;
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incnam[0] = 0;
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lineno = savlno;
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}
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/* Assemble Input File (Two Pass) *
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* Args: pass - Assembly Pass (1 or 2) *
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* Requires: inpfil - Input File Pointer *
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@ -493,9 +576,10 @@ void asmfil(int pass) {
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orgadr = -1; //Origin Address Not Set
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curadr = orgadr; //Set Current Address to Origin
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rewind(inpfil); //Start at Beginning of Input File
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while (!feof(inpfil)) {
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linptr = fgets(inplin, MAXSTR, inpfil);
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if (linptr == NULL) break;
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while (TRUE) {
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if (incfil) linptr = fgets(inplin, MAXSTR, incfil);
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else linptr = fgets(inplin, MAXSTR, inpfil);
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if (linptr == NULL) {if (incfil) {clsinc(); continue;} else break;}
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if (DEBUG) printf("%05d %04X: %s", lineno, curadr, inplin);
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lstadr = curadr; //Set List Address
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mcode[0] = 0; //Clear Generated Macbine Code
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@ -506,8 +590,10 @@ void asmfil(int pass) {
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if (passno == 2) {
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if (lstadr < 0) hexadr[0] = 0; else sprintf(hexadr, "%04X", lstadr);
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fprintf(lstfil, "%05d %-4s %-9s%-7s %-5s %-16s %s\n", lineno, hexadr, mcode, label, mnmnc, oprnd, cmmnt );
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fflush(lstfil); //Flush Output Buffer in case of Segmentation Fault
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}
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lineno++;
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if (incnam[0] && incfil == NULL) opninc(); //Open Include File
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}
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}
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@ -548,16 +634,9 @@ void pcargs(int argc, char *argv[]) {
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///if (argnum<2) usage();
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}
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/* Open File with Error Checking */
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FILE * opnfil(char* name, char* mode) {
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if (DEBUG) printf("Opening file '%s' with mode '%s'\n", name, mode);
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FILE *fp = fopen(name, mode);
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if (!fp) xerror("Error Opening File '%s'\n", name);
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return fp;
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}
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int main(int argc, char *argv[]) {
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lstnam[0] = 0; lstfil = NULL; //Default to No List File
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incnam[0] = 0; incfil = NULL; //Include File Not Opened
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lineno = 0; //No Line Number (yet)
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objtyp = BINFIL; //Default Object File Type to Binary
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pcargs(argc, argv); //Parse Command Line Arguments
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@ -568,5 +647,6 @@ int main(int argc, char *argv[]) {
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asmfil(1); //Assemble Input File (First Pass)
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asmfil(2); //Assemble Input File (First Pass)
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if (lstfil) prtsym(); //Print Symbol Table
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exit(0); //Exit with No Errors
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}
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123
a02.h
123
a02.h
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@ -1,8 +1,8 @@
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/* Definitions for A02 Assembler */
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#define MAXSTR 128 //Maximum String Length
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#define MAXSYM 8 //Maximum Symbol Length
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#define MAXGLB 1024 //Maximum Number of Global Labels
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#define MAXLBL 8 //Maximum Symbol Length
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#define MAXSYM 1024 //Maximum Number of Global Labels
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#define FALSE 0
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#define TRUE -1
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@ -22,83 +22,60 @@
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#define INDCY 0x0800 //(Indirect),Y
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#define RELTV 0x1000 //Relative
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struct opc {char name[4], token; int amode;};
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struct amd {int amode; char desc[12];};
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struct amd amdesc[] = {
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{ACMLT, "Accumulator"},
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{IMMDT, "Immediate"},
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{ZPAGE, "Zero Page"},
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{ZPAGX, "Zero Page,X"},
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{ABSLT, "Absolute"},
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{ABSLX, "Absolute,X"},
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{ABSLY, "Absolute,Y"},
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{IMPLD, "Implied"},
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{INDCT, "(Indirect)"},
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{INDCX, "(Indirect,X)"},
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{INDCY, "(Indirect),Y"},
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{RELTV, "Relative"},
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{0, ""}
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};
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struct opc {char name[5], token; int amode;};
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struct opc psolst[] = {
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{"BYTE", 'B', 0}, {"WORD", 'W', 0}, {"EQU", '=', 0}, {"FILL", 'F', 0}, {"INCL", 'I', 0},
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{"SUBR", 'S', 0}, {"ORG", '*', 0}, {"PROC", 'P', 0}, {"DC", 'B', 0}, {"DS", 'F', 0},
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{"", 0, 0}
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};
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struct opc opclst[] = {
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{"EQU", '=', 0},
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{"BYT", 'B', 0},
|
||||
{"WOR", 'W', 0},
|
||||
{"FIL", 'F', 0},
|
||||
{"SUB", 'S', 0},
|
||||
{"ORG", '*', 0},
|
||||
{"PRO", 'P', 0},
|
||||
{"BRK", 0x00, 0x0100},
|
||||
{"CLC", 0x18, 0x0100},
|
||||
{"CLD", 0xD8, 0x0100},
|
||||
{"CLI", 0x58, 0x0100},
|
||||
{"CLV", 0xB8, 0x0100},
|
||||
{"DEX", 0xCA, 0x0100},
|
||||
{"DEY", 0x88, 0x0100},
|
||||
{"INX", 0xE8, 0x0100},
|
||||
{"INY", 0xC8, 0x0100},
|
||||
{"NOP", 0xEA, 0x0100},
|
||||
{"PHA", 0x48, 0x0100},
|
||||
{"PHP", 0x08, 0x0100},
|
||||
{"PHX", 0xDA, 0x0100},
|
||||
{"PHY", 0x5A, 0x0100},
|
||||
{"PLA", 0x68, 0x0100},
|
||||
{"PLP", 0x28, 0x0100},
|
||||
{"PLX", 0xFA, 0x0100},
|
||||
{"PLY", 0x7A, 0x0100},
|
||||
{"RTI", 0x40, 0x0100},
|
||||
{"RTS", 0x60, 0x0100},
|
||||
{"SEC", 0x38, 0x0100},
|
||||
{"SED", 0xF8, 0x0100},
|
||||
{"SEI", 0x78, 0x0100},
|
||||
{"STP", 0xDB, 0x0100},
|
||||
{"TAX", 0xAA, 0x0100},
|
||||
{"TAY", 0xA8, 0x0100},
|
||||
{"TSX", 0xBA, 0x0100},
|
||||
{"TXA", 0x8A, 0x0100},
|
||||
{"TXS", 0x9A, 0x0100},
|
||||
{"TYA", 0x98, 0x0100},
|
||||
{"WAI", 0xCB, 0x0100},
|
||||
{"ADC", 0x61, 0x0EFE},
|
||||
{"AND", 0x21, 0x0EFE},
|
||||
{"CMP", 0xC1, 0x0EFE},
|
||||
{"EOR", 0x41, 0x0EFE},
|
||||
{"LDA", 0xA1, 0x0EFE},
|
||||
{"ORA", 0x01, 0x0EFE},
|
||||
{"SBC", 0xE1, 0x0EFE},
|
||||
{"STA", 0x81, 0x0EFE},
|
||||
{"ASL", 0x02, 0x007D},
|
||||
{"DEC", 0xC2, 0x007D},
|
||||
{"INC", 0xE2, 0x007D},
|
||||
{"LSR", 0x42, 0x007D},
|
||||
{"ROL", 0x22, 0x007D},
|
||||
{"ROR", 0x62, 0x007D},
|
||||
{"BRK", 0x00, 0x0100}, {"NOP", 0xEA, 0x0100}, {"STP", 0xDB, 0x0100}, {"WAI", 0xCB, 0x0100},
|
||||
{"DEX", 0xCA, 0x0100}, {"DEY", 0x88, 0x0100}, {"INX", 0xE8, 0x0100}, {"INY", 0xC8, 0x0100},
|
||||
{"PHA", 0x48, 0x0100}, {"PHP", 0x08, 0x0100}, {"PHX", 0xDA, 0x0100}, {"PHY", 0x5A, 0x0100},
|
||||
{"PLA", 0x68, 0x0100}, {"PLP", 0x28, 0x0100}, {"PLX", 0xFA, 0x0100}, {"PLY", 0x7A, 0x0100},
|
||||
{"CLC", 0x18, 0x0100}, {"CLD", 0xD8, 0x0100}, {"CLI", 0x58, 0x0100}, {"CLV", 0xB8, 0x0100},
|
||||
{"SEC", 0x38, 0x0100}, {"SED", 0xF8, 0x0100}, {"SEI", 0x78, 0x0100},
|
||||
{"TAX", 0xAA, 0x0100}, {"TAY", 0xA8, 0x0100}, {"TSX", 0xBA, 0x0100},
|
||||
{"TXA", 0x8A, 0x0100}, {"TYA", 0x98, 0x0100}, {"TXS", 0x9A, 0x0100},
|
||||
{"RTI", 0x40, 0x0100}, {"RTS", 0x60, 0x0100},
|
||||
|
||||
{"BCS", 0xB0, 0x1000}, {"BEQ", 0xF0, 0x1000}, {"BMI", 0x30, 0x1000}, {"BVS", 0x70, 0x1000},
|
||||
{"BCC", 0x90, 0x1000}, {"BNE", 0xD0, 0x1000}, {"BPL", 0x10, 0x1000}, {"BVC", 0x50, 0x1000},
|
||||
{"BRA", 0x80, 0x1000},
|
||||
|
||||
{"LDA", 0xA1, 0x0EFE}, {"ADC", 0x61, 0x0EFE}, {"AND", 0x21, 0x0EFE}, {"CMP", 0xC1, 0x0EFE},
|
||||
{"STA", 0x81, 0x0EFE}, {"SBC", 0xE1, 0x0EFE}, {"ORA", 0x01, 0x0EFE}, {"EOR", 0x41, 0x0EFE},
|
||||
|
||||
{"ASL", 0x02, 0x007D}, {"ROL", 0x22, 0x007D}, {"INC", 0xE2, 0x007D}, {"LSR", 0x42, 0x007D},
|
||||
{"ROR", 0x62, 0x007D}, {"DEC", 0xC2, 0x007D},
|
||||
|
||||
{"TRB", 0x10, 0x0024}, {"TSB", 0x00, 0x0024},
|
||||
{"CPX", 0xE0, 0x0026}, {"CPY", 0xC0, 0x0026},
|
||||
{"LDX", 0xA2, 0x00A6}, {"STX", 0x82, 0x00A6},
|
||||
{"BIT", 0x20, 0x006E},
|
||||
{"CPX", 0xE0, 0x0026},
|
||||
{"CPY", 0xC0, 0x0026},
|
||||
{"LDY", 0xA0, 0x006E},
|
||||
{"BIT", 0x20, 0x006C},
|
||||
{"STY", 0x80, 0x002C},
|
||||
{"STZ", 0x60, 0x006C},
|
||||
{"TRB", 0x10, 0x0024},
|
||||
{"TSB", 0x00, 0x0024},
|
||||
{"LDX", 0xA2, 0x00A6},
|
||||
{"STX", 0x82, 0x00A6},
|
||||
{"JMP", 0x4C, 0x0620},
|
||||
{"JSR", 0x14, 0x0020},
|
||||
{"BCC", 0x90, 0x1000},
|
||||
{"BCS", 0xB0, 0x1000},
|
||||
{"BEQ", 0xF0, 0x1000},
|
||||
{"BMI", 0x30, 0x1000},
|
||||
{"BNE", 0xD0, 0x1000},
|
||||
{"BPL", 0x10, 0x1000},
|
||||
{"BRA", 0x80, 0x1000},
|
||||
{"BVC", 0x50, 0x1000},
|
||||
{"BVS", 0x70, 0x1000},
|
||||
{"LDY", 0xA0, 0x002E},
|
||||
{"STY", 0x80, 0x002C},
|
||||
{"", 0, 0}
|
||||
};
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue
Block a user