mirror of
https://github.com/SEPPDROID/Digital-Research-Source-Code.git
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409 lines
11 KiB
C
409 lines
11 KiB
C
/*
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Copyright 1981
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Alcyon Corporation
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8716 Production Ave.
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San Diego, Ca. 92121
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*/
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#include <stdio.h>
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#include <klib.h>
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#include "machine.h"
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#include "ctype.h"
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#ifdef PDP11
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struct {
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char lobyte;
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char hibyte;
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};
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struct {
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char *ptrw1;
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char *ptrw2;
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};
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struct {
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int wd1;
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int wd2;
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};
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struct {
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int swd1;
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};
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#endif
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#ifdef MC68000
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struct {
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char hibyte;
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char lobyte;
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};
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struct {
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char *ptrw2;
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};
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struct {
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int wd1;
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int wd2;
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};
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struct {
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int swd1;
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};
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#endif
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#ifdef VAX
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struct {
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short wd2;
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short wd1;
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};
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struct {
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short swd1;
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};
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struct {
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char lobyte;
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char hibyte;
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};
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struct {
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char *ptrw2;
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};
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#endif
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/* format of a symbol entry in the main table*/
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# define NAMELEN 8 /*length of name in symbol table*/
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struct symtab {
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char name[NAMELEN]; /*symbol name*/
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short flags; /*bit flags*/
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char *tlnk; /*table link*/
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long vl1; /*symbol value*/
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};
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struct symtab *symtptr;
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# define STESIZE (sizeof *symtptr) /*byte length of symbol table entry*/
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/* flags for symbols*/
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# define SYDF 0100000 /*defined*/
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# define SYEQ 0040000 /*equated*/
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# define SYGL 0020000 /*global - entry or external*/
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# define SYER 0010000 /*equated register*/
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# define SYXR 0004000 /*external reference*/
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# define SYRA 0002000 /*DATA based relocatable*/
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# define SYRO 0001000 /*TEXT based relocatable*/
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# define SYBS 0000400 /*BSS based relocatable*/
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# define SYIN 0000200 /*internal symbol -- opcode, directive or equ*/
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# define SYPC 0000100 /*[vlh]equated using star '*' expression*/
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# define SYRM 0000040 /*[vlh]register mask equate*/
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/*flags for opcodes and directives*/
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# define OPDR 0100000 /*0=>opcode, 1=>directive*/
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# define OPFF 037 /*type of instruction (used as mask)*/
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struct irts {
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char *irle; /*ptr to last entry in chain*/
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char *irfe; /*ptr to first entry in chain*/
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};
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long stlen; /*length of symbol table*/
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/*
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* intermediate text file
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* format of the intermediate text for one statement:
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*
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* ******************************************************
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* * it type = ITBS * # it entries * 0
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* ******************************************************
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* * absolute line number (long) *
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* ******************************************************
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* * it type = ITSY * instr length * 1
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* ******************************************************
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* * symbol table pointer for stmt label (long) *
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* ******************************************************
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* * it type = ITSY * instr mode length * 2
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* ******************************************************
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* * opcode ptr (long) *
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* ******************************************************
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* * it type = ITCN * relocation base * 3
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* ******************************************************
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* * location counter (pass 1) *
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* ******************************************************
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* * it type * relocation flag * 4 - oprnds
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* ******************************************************
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* * value (long) *
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* ******************************************************
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* .
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*
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* .
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* ******************************************************
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* * it type * relocation flag * n - oprnds
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* ******************************************************
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* * value (long) *
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* ******************************************************
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*/
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#define ITOP1 4 /*first it entry for operands*/
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/*
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* it type meaning
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* 0 beginning of statement
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* 1 value is pointer to symbol table
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* 2 value is a constant
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* 3 value is a specal char
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*
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* relocation flag for opcode it entry is operand length:
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* 'b' => byte
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* 'w' => word
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* 'l' => long
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*/
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struct it {
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char itty; /*it type*/
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char itrl; /*relocation flag or # it entries*/
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long itop;
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};
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int mode; /*operand mode (byte, word, long)*/
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int modelen; /*operand length per mode*/
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#define BYTE 'b'
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#define WORD 'w'
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#define LONG 'l'
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/* parameters that define the main table*/
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#define SZMT 300 /*initial size of the main table */
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/*must be large enough to initialize*/
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#ifdef PDP11
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#define ICRSZMT 10 /*add to main table when run out*/
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#else
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#define ICRSZMT 50 /*add to main table when run out*/
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#endif
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int cszmt; /*current size of main table*/
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char *bmte; /*beginning of main table*/
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char *emte; /*end of main table*/
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/* intermediate text types*/
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#define ITBS 0 /*beginning of statement*/
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#define ITSY 1 /*pointer to symbol table*/
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#define ITCN 2 /*constant*/
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#define ITSP 3 /*special*/
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#define ITRM 4 /*[vlh]register mask!*/
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#define ITPC 5 /*[vlh]pc relative argument*/
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# define ITBSZ 256 /*size of the it buffer*/
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short itbuf[ITBSZ]; /*it buffer*/
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#define STMAX 200 /*size of intermediate text buffer*/
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struct it stbuf[STMAX]; /*holds it for one statement*/
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char sbuf[512]; /*holds one block of source*/
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/*initial reference table for symbols*/
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# define SZIRT 128
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char *sirt[SZIRT];
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/*initial reference table to opcodes*/
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char *oirt[SZIRT];
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/*external symbol table*/
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#define EXTSZ 512
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char *extbl[EXTSZ];
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int extindx; /*index to external symbol table*/
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char **pexti; /*ptr to external symbol table*/
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int absln; /*absolute line number*/
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int p2absln; /*pass 2 line number*/
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int fcflg; /*0=>passed an item. 1=>first char*/
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int fchr; /*first char in term*/
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int ifn; /*source file descriptor*/
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short *pitix; /*ptr to it buffer*/
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int itwc; /*number of words in it buffer*/
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struct it *pitw; /*ptr to it buffer next entry*/
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int itype; /*type of item*/
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long ival; /*value of item*/
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char *lblpt; /*label pointer*/
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char lbt[NAMELEN]; /*holds label name*/
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char *lmte; /*last entry in main table*/
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long loctr; /*location counter*/
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long savelc[4]; /*save relocation counters for 3 bases*/
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int nite; /*number of entries in stbuf*/
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struct it *pnite;
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int lfn; /*loader output file descriptor*/
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char *opcpt; /*pointer to opcode entry in main table*/
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int p2flg; /*0=>pass 1 1=>pass 2*/
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char **pirt; /*entry in initial reference table*/
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int reloc; /*relocation value returned by expression evaluator (expr)*/
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int rlflg; /*relocation value of current location counter*/
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/*relocation values*/
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# define ABS 0 /*absolute*/
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# define DATA 1
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# define TEXT 2
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# define BSS 3
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# define EXTRN 4 /*externally defined*/
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#define EOLC '\n' /*end of line character*/
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#define EOF 0 /*end of file indicator*/
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#define NULL 0 /* [vlh] character null '\0' */
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#define TRUE 1 /* [vlh] boolean values */
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#define FALSE 0 /* [vlh] boolean values */
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int format;
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int sbuflen; /*number of chars in sbuf*/
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char *psbuf; /*ptr into sbuf*/
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int itfn; /*it file number*/
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char itfnc; /*last char of it file name*/
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int trbfn; /*temp for text relocation bits*/
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char trbfnc; /*last char of text rb file*/
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int dafn; /*file for data stuff*/
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char dafnc; /*last char of data file*/
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int drbfn; /*file for data relocation bits*/
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char drbfnc; /*last char*/
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int prtflg; /*print output flag*/
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int undflg; /*make undefined symbols external flag*/
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int starmul; /* * is multiply operator*/
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char *endptr, *addptr;
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char *orgptr;
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char *subptr, *addiptr, *addqptr, *subiptr, *subqptr;
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char *cmpptr, *addaptr, *cmpaptr, *subaptr, *cmpmptr;
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char *equptr;
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char *andptr, *andiptr, *eorptr, *eoriptr, *orptr, *oriptr;
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char *cmpiptr;
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char *moveptr, *moveqptr;
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char *exgptr;
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char *evenptr;
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char *jsrptr, *bsrptr, *nopptr;
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char peekc;
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int numcon[2], numsym[2], indir[2], immed[2], numreg[2];
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int plevel; /*parenthesis level counter*/
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int opdix; /*operand index counter*/
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int p1inlen; /*pass 1 instr length*/
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int instrlen; /*pass 2 bytes in current instruction*/
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/* effective address mode bits*/
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#define DDIR 000
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#define ADIR 010
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#define INDIRECT 020
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#define INDINC 030
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#define DECIND 040
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#define INDDISP 050
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#define INDINX 060
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#define SADDR 070
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#define LADDR 071
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#define IMM 074
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#define AREGLO 8
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#define AREGHI 15
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/* relocation bit definitions:*/
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#define RBMASK 07 /*tells type of relocation*/
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#define INSABS 7 /*first word of instr -- absolute*/
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#define DABS 0 /*data word absolute*/
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#define TRELOC 2 /* TEXT relocatable*/
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#define DRELOC 1 /* DATA relocatable*/
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#define BRELOC 3 /* BSS relocatable*/
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#define EXTVAR 4 /* ref to external variable*/
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#define LUPPER 5 /* upper word of long*/
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#define EXTREL 6 /* external relative mode*/
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/* ptrs to ins[] and rlbits[]*/
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int *pins;
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int *prlb;
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int ins[5]; /*holds instruction words*/
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#define PRTCHLEN 128
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char prtchars[PRTCHLEN]; /*line buffer for putchar*/
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char *prtchidx; /*index for putchar*/
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int extflg, extref; /*external in expr*/
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#define CCR 16
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#define SR 17
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#define USP 18
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#define MOVECCR 042300
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#define MOVESR 043300
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#define SRMOVE 040300
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#define MOVEUSP 047140
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struct op {
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int ea; /* effective address bits*/
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int len; /* effective address length in bytes*/
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long con; /*constant or reloc part of operand*/
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int drlc; /*reloc of con*/
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int ext; /*external variable #*/
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int idx; /*index register if any*/
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int xmod; /*mode of index reg*/
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} opnd[2];
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#define OPSTLEN 10
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#define TREELEN 20
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struct buf{
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int fildes;
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int nunused;
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char *xfree;
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char buff[512];
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};
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struct buf lbuf;
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struct buf tbuf;
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struct buf dabuf;
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struct buf drbuf;
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int nerror; /*# of assembler errors*/
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int in_err; /*[vlh] don't generate instrlen err if already err state*/
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int shortadr; /*short addresses if set*/
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#define CLRFOR 24
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#define CLRVAL 041000
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long itoffset;
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#define LASTCHTFN *tfilptr
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char *tfilptr; /* -> Changed filename character */
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#define PC 22
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int equflg; /*doing an equate stmt*/
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#define ANDI 01000
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#define AND 0140000
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#define ORI 0
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#define OR 0100000
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#define EORI 05000
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#define EOR 0130000
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#define MOVE 0
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long lseek();
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char *sbrk();
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char *lemt();
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int refpc; /* * referenced in expr*/
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#define SOH 1
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/* Conditional Assembly variables and constants [vlh] */
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#define LOW_CA 21 /* [vlh] */
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#define HI_CA 30 /* [vlh] */
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int ca_true; /* true unless in a false CA*/
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int ca; /* depth of conditional assembly, none = 0*/
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int ca_level; /* at what CA depth did CA go false?*/
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/* pass 1 global variables */
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int numops; /*number of operands*/
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int inoffset; /*[vlh]offset directive*/
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int didorg;
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int initflg; /*initialize flag*/
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/* defines */
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#define igblk() while(fchr==' ') fchr=gchr()
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#define ckein() ((pitw >= pnite))
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/* is it an alterable operand */
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#define memalt(ap) (memea(ap) && altea(ap))
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#define dataalt(ap) (dataea(ap) && altea(ap))
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#define altea(ap) ((((ap)->ea&070)!=SADDR || ((ap)->ea&6)==0))
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/* is it the specific type of operand */
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#define memea(ap) (((ap)->ea&070) >= INDIRECT)
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#define dataea(ap) (((ap)->ea&070) != ADIR)
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#define pcea(ap) ((ap)->ea==072 || (ap)->ea==073)
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#define ckdreg(ap) ((ap)->ea>=0 && (ap)->ea<AREGLO)
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#define ckareg(ap) ((ap)->ea>=AREGLO && (ap)->ea<=AREGHI)
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/*
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* DRI Listing Hacks:
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*/
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char *sfname; /* -> Source file name */
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#define LPP 58 /* # lines / page */
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int xline; /* Present line # */
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int xpage; /* Present Page # */
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