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- /*
- HEADER: CUG267;
- TITLE: S6 Cross-Assembler (Portable);
- FILENAME: AS6UTIL.C;
- VERSION: 0.2;
- DATE: 08/27/1988;
- SEE-ALSO: AS6.H;
- AUTHORS: William C. Colley III;
- */
-
- /*
- S6 Cross-Assembler in Portable C
-
- Copyright (c) 1986, 1987 William C. Colley, III
-
- Revision History:
-
- Ver Date Description
-
- 0.0 NOV 1987 Derived from my 6502 cross-assembler. WCC3.
-
- 0.1 JUNE 1988 Fixed glitches in the relative jumps and in the bit
- operations to make the assembler conform to the
- machine rather than to the machine's documentation.
- WCC3.
-
- 0.2 AUG 1988 Fixed a bug in the command line parser that puts it
- into a VERY long loop if the user types a command line
- like "AS6 FILE.ASM -L". WCC3 per Alex Cameron.
-
- This module contains the following utility packages:
-
- 1) symbol table building and searching
-
- 2) opcode and operator table searching
-
- 3) listing file output
-
- 4) hex file output
-
- 5) error flagging
- */
-
- /* Get global goodies: */
-
- #include "as6.h"
-
- /* Make sure that MSDOS compilers using the large memory model know */
- /* that calloc() returns pointer to char as an MSDOS far pointer is */
- /* NOT compatible with the int type as is usually the case. */
-
- char *calloc();
-
- /* Get access to global mailboxes defined in AS6.C: */
-
- extern char errcode, line[], title[];
- extern int eject, listhex;
- extern unsigned address, bytes, errors, listleft, obj[], pagelen;
-
- /* The symbol table is a binary tree of variable-length blocks drawn */
- /* from the heap with the calloc() function. The root pointer lives */
- /* here: */
-
- static SYMBOL *sroot = NULL;
-
- /* Add new symbol to symbol table. Returns pointer to symbol even if */
- /* the symbol already exists. If there's not enough memory to store */
- /* the new symbol, a fatal error occurs. */
-
- SYMBOL *new_symbol(nam)
- char *nam;
- {
- SCRATCH int i;
- SCRATCH SYMBOL **p, *q;
- void fatal_error();
-
- for (p = &sroot; (q = *p) && (i = strcmp(nam,q -> sname)); )
- p = i < 0 ? &(q -> left) : &(q -> right);
- if (!q) {
- if (!(*p = q = (SYMBOL *)calloc(1,sizeof(SYMBOL) + strlen(nam))))
- fatal_error(SYMBOLS);
- strcpy(q -> sname,nam);
- }
- return q;
- }
-
- /* Look up symbol in symbol table. Returns pointer to symbol or NULL */
- /* if symbol not found. */
-
- SYMBOL *find_symbol(nam)
- char *nam;
- {
- SCRATCH int i;
- SCRATCH SYMBOL *p;
-
- for (p = sroot; p && (i = strcmp(nam,p -> sname));
- p = i < 0 ? p -> left : p -> right);
- return p;
- }
-
- /* Opcode table search routine. This routine pats down the opcode */
- /* table for a given opcode and returns either a pointer to it or */
- /* NULL if the opcode doesn't exist. */
-
- OPCODE *find_code(nam)
- char *nam;
- {
- OPCODE *bsearch();
-
- static OPCODE opctbl[] = {
- { ADD_OP + 2, 0x005f, "ADD" },
- { ADDI_OP + 2, 0x0057, "ADDI" },
- { ADD_OP + 2, 0x00bf, "AND" },
- { ADDI_OP + 2, 0x00b7, "ANDI" },
- { JP + 2, 0x0001, "CALL" },
- { CLR + 2, 0x000d, "CLR" },
- { SHIFT_OP + 1, 0x002d, "COM" },
- { ADD_OP + 2, 0x003f, "CP" },
- { ADDI_OP + 2, 0x0037, "CPI" },
- { PSEUDO, DB, "DB" },
- { INC_DEC + 2, 0x1dff, "DEC" },
- { PSEUDO, DS, "DS" },
- { PSEUDO, DW, "DW" },
- { PSEUDO + ISIF, ELSE, "ELSE" },
- { PSEUDO, END, "END" },
- { PSEUDO + ISIF, ENDIF, "ENDIF" },
- { PSEUDO, EQU, "EQU" },
- { PSEUDO + ISIF, IF, "IF" },
- { INC_DEC + 2, 0x157f, "INC" },
- { PSEUDO, INCL, "INCL" },
- { JP + 2, 0x0009, "JP" },
- { JR + 1, 0x0006, "JRC" },
- { JR_SIGN + 3, 0x00f3, "JRN" },
- { JR + 1, 0x0002, "JRNC" },
- { JR + 1, 0x0000, "JRNZ" },
- { JR_SIGN + 3, 0x00e3, "JRP" },
- { JR_BIT + 3, 0x0003, "JRR" },
- { JR_BIT + 3, 0x0013, "JRS" },
- { JR + 1, 0x0004, "JRZ" },
- { LD + 2, 0x351f, "LD" },
- { LDI + 3, 0x000d, "LDI" },
- { NO_ARG + 1, 0x0004, "NOP" },
- { PSEUDO, ORG, "ORG" },
- { PSEUDO, PAGE, "PAGE" },
- { BIT_OP + 2, 0x000b, "RES" },
- { NO_ARG + 1, 0x00cd, "RET" },
- { NO_ARG + 1, 0x004d, "RETI" },
- { SHIFT_OP + 1, 0x00ad, "RLC" },
- { BIT_OP + 2, 0x001b, "SET" },
- { SHIFT_OP + 2, 0xff5f, "SLA" },
- { NO_ARG + 1, 0x006d, "STOP" },
- { ADD_OP + 2, 0x00df, "SUB" },
- { ADDI_OP + 2, 0x00d7, "SUBI" },
- { PSEUDO, TITLE, "TITLE" },
- { NO_ARG + 1, 0x00ed, "WAIT" },
- { PSEUDO, VAR, "VAR" }
- };
-
- return bsearch(opctbl,opctbl + (sizeof(opctbl) / sizeof(OPCODE)),nam);
- }
-
- /* Operator table search routine. This routine pats down the */
- /* operator table for a given operator and returns either a pointer */
- /* to it or NULL if the opcode doesn't exist. */
-
- OPCODE *find_operator(nam)
- char *nam;
- {
- OPCODE *bsearch();
-
- static OPCODE oprtbl[] = {
- { VAL, 0xff, "A" },
- { BINARY + LOG1 + OPR, AND, "AND" },
- { BINARY + RELAT + OPR, '=', "EQ" },
- { BINARY + RELAT + OPR, GE, "GE" },
- { BINARY + RELAT + OPR, '>', "GT" },
- { UNARY + UOP3 + OPR, HIGH, "HIGH" },
- { BINARY + RELAT + OPR, LE, "LE" },
- { UNARY + UOP3 + OPR, LOW, "LOW" },
- { BINARY + RELAT + OPR, '<', "LT" },
- { BINARY + MULT + OPR, MOD, "MOD" },
- { BINARY + RELAT + OPR, NE, "NE" },
- { UNARY + UOP2 + OPR, NOT, "NOT" },
- { BINARY + LOG2 + OPR, OR, "OR" },
- { BINARY + MULT + OPR, SHL, "SHL" },
- { BINARY + MULT + OPR, SHR, "SHR" },
- { VAL, 0x82, "V" },
- { VAL, 0x83, "W" },
- { VAL, 0x80, "X" },
- { BINARY + LOG2 + OPR, XOR, "XOR" },
- { VAL, 0x81, "Y" }
- };
-
- return bsearch(oprtbl,oprtbl + (sizeof(oprtbl) / sizeof(OPCODE)),nam);
- }
-
- static OPCODE *bsearch(lo,hi,nam)
- OPCODE *lo, *hi;
- char *nam;
- {
- SCRATCH int i;
- SCRATCH OPCODE *chk;
-
- for (;;) {
- chk = lo + (hi - lo) / 2;
- if (!(i = ustrcmp(chk -> oname,nam))) return chk;
- if (chk == lo) return NULL;
- if (i < 0) lo = chk;
- else hi = chk;
- }
- }
-
- static int ustrcmp(s,t)
- char *s, *t;
- {
- SCRATCH int i;
-
- while (!(i = toupper(*s++) - toupper(*t)) && *t++);
- return i;
- }
-
- /* Buffer storage for line listing routine. This allows the listing */
- /* output routines to do all operations without the main routine */
- /* having to fool with it. */
-
- static FILE *list = NULL;
-
- /* Listing file open routine. If a listing file is already open, a */
- /* warning occurs. If the listing file doesn't open correctly, a */
- /* fatal error occurs. If no listing file is open, all calls to */
- /* lputs() and lclose() have no effect. */
-
- void lopen(nam)
- char *nam;
- {
- FILE *fopen();
- void fatal_error(), warning();
-
- if (list) warning(TWOLST);
- else if (!(list = fopen(nam,"w"))) fatal_error(LSTOPEN);
- return;
- }
-
- /* Listing file line output routine. This routine processes the */
- /* source line saved by popc() and the output of the line assembler in */
- /* buffer obj into a line of the listing. If the disk fills up, a */
- /* fatal error occurs. */
-
- void lputs()
- {
- SCRATCH int i, j;
- SCRATCH unsigned *o;
- void check_page(), fatal_error();
-
- if (list) {
- i = bytes; o = obj;
- do {
- fprintf(list,"%c ",errcode);
- if (listhex) {
- fprintf(list,"%04x ",address);
- for (j = 4; j; --j) {
- if (i) { --i; ++address; fprintf(list," %02x",*o++); }
- else fprintf(list," ");
- }
- }
- else fprintf(list,"%18s","");
- fprintf(list," %s",line); strcpy(line,"\n");
- check_page();
- if (ferror(list)) fatal_error(DSKFULL);
- } while (listhex && i);
- }
- return;
- }
-
- /* Listing file close routine. The symbol table is appended to the */
- /* listing in alphabetic order by symbol name, and the listing file is */
- /* closed. If the disk fills up, a fatal error occurs. */
-
- static int col = 0;
-
- void lclose()
- {
- void fatal_error(), list_sym();
-
- if (list) {
- if (sroot) {
- list_sym(sroot);
- if (col) fprintf(list,"\n");
- }
- fprintf(list,"\f");
- if (ferror(list) || fclose(list) == EOF) fatal_error(DSKFULL);
- }
- return;
- }
-
- static void list_sym(sp)
- SYMBOL *sp;
- {
- void check_page();
-
- if (sp) {
- list_sym(sp -> left);
- fprintf(list,"%04x %-10s",sp -> valu,sp -> sname);
- if (col = ++col % SYMCOLS) fprintf(list," ");
- else {
- fprintf(list,"\n");
- if (sp -> right) check_page();
- }
- list_sym(sp -> right);
- }
- return;
- }
-
- static void check_page()
- {
- if (pagelen && !--listleft) eject = TRUE;
- if (eject) {
- eject = FALSE; listleft = pagelen; fprintf(list,"\f");
- if (title[0]) { listleft -= 2; fprintf(list,"%s\n\n",title); }
- }
- return;
- }
-
- /* Buffer storage for hex output file. This allows the hex file */
- /* output routines to do all of the required buffering and record */
- /* forming without the main routine having to fool with it. */
-
- static FILE *hex = NULL;
- static unsigned cnt = 0;
- static unsigned addr = 0;
- static unsigned sum = 0;
- static unsigned buf[HEXSIZE];
-
- /* Hex file open routine. If a hex file is already open, a warning */
- /* occurs. If the hex file doesn't open correctly, a fatal error */
- /* occurs. If no hex file is open, all calls to hputc(), hseek(), and */
- /* hclose() have no effect. */
-
- void hopen(nam)
- char *nam;
- {
- FILE *fopen();
- void fatal_error(), warning();
-
- if (hex) warning(TWOHEX);
- else if (!(hex = fopen(nam,"w"))) fatal_error(HEXOPEN);
- return;
- }
-
- /* Hex file write routine. The data byte is appended to the current */
- /* record. If the record fills up, it gets written to disk. If the */
- /* disk fills up, a fatal error occurs. */
-
- void hputc(c)
- unsigned c;
- {
- void record();
-
- if (hex) {
- buf[cnt++] = c;
- if (cnt == HEXSIZE) record(0);
- }
- return;
- }
-
- /* Hex file address set routine. The specified address becomes the */
- /* load address of the next record. If a record is currently open, */
- /* it gets written to disk. If the disk fills up, a fatal error */
- /* occurs. */
-
- void hseek(a)
- unsigned a;
- {
- void record();
-
- if (hex) {
- if (cnt) record(0);
- addr = a;
- }
- return;
- }
-
- /* Hex file close routine. Any open record is written to disk, the */
- /* EOF record is added, and file is closed. If the disk fills up, a */
- /* fatal error occurs. */
-
- void hclose()
- {
- void fatal_error(), record();
-
- if (hex) {
- if (cnt) record(0);
- record(1);
- if (fclose(hex) == EOF) fatal_error(DSKFULL);
- }
- return;
- }
-
- static void record(typ)
- unsigned typ;
- {
- SCRATCH unsigned i;
- void fatal_error(), putb();
-
- putc(':',hex); putb(cnt); putb(high(addr));
- putb(low(addr)); putb(typ);
- for (i = 0; i < cnt; ++i) putb(buf[i]);
- putb(low(-sum)); putc('\n',hex);
-
- addr += cnt; cnt = 0;
-
- if (ferror(hex)) fatal_error(DSKFULL);
- return;
- }
-
- static void putb(b)
- unsigned b;
- {
- static char digit[] = "0123456789ABCDEF";
-
- putc(digit[b >> 4],hex); putc(digit[b & 0x0f],hex);
- sum += b; return;
- }
-
- /* Error handler routine. If the current error code is non-blank, */
- /* the error code is filled in and the number of lines with errors */
- /* is adjusted. */
-
- void error(code)
- char code;
- {
- if (errcode == ' ') { errcode = code; ++errors; }
- return;
- }
-
- /* Fatal error handler routine. A message gets printed on the stderr */
- /* device, and the program bombs. */
-
- void fatal_error(msg)
- char *msg;
- {
- printf("Fatal Error -- %s\n",msg);
- exit(-1);
- }
-
- /* Non-fatal error handler routine. A message gets printed on the */
- /* stderr device, and the routine returns. */
-
- void warning(msg)
- char *msg;
- {
- printf("Warning -- %s\n",msg);
- return;
- }