499 lines
8.3 KiB
C
499 lines
8.3 KiB
C
/*
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* (c) copyright 1983 by the Vrije Universiteit, Amsterdam, The Netherlands.
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*
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* This product is part of the Amsterdam Compiler Kit.
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*
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* Permission to use, sell, duplicate or disclose this software must be
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* obtained in writing. Requests for such permissions may be sent to
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*
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* Dr. Andrew S. Tanenbaum
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* Wiskundig Seminarium
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* Vrije Universiteit
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* Postbox 7161
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* 1007 MC Amsterdam
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* The Netherlands
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*
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*/
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#ifndef NORCSID
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static char rcsid[] = "$Header$";
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#endif
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/*
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* Decode compact EM assembly language
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*
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* Author: Johan Stevenson, Vrije Universiteit, Amsterdam
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*/
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#include <stdio.h>
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#include <assert.h>
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#include <ctype.h>
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#include <em_spec.h>
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#include <em_pseu.h>
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#include <em_flag.h>
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#include <em_ptyp.h>
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#include <em_mes.h>
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#define get8() ((unsigned)getchar())
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#define check(x) if (!(x)) fail_check()
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#define MAXSTR 256
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/*
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* global variables
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*/
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int opcode;
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int offtyp;
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long argval;
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int dlbval;
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char string[MAXSTR];
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int strsiz;
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int wsize;
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int psize;
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int lineno;
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int argnum;
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int errors;
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char *progname;
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char *filename;
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long wordmask[] = { /* allowed bits in a word */
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0x00000000,
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0x000000FF,
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0x0000FFFF,
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0x00000000,
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0xFFFFFFFF
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};
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long sizemask[] = { /* allowed bits in multiples of 'wsize' */
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0x00000000,
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0x7FFFFFFF,
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0x7FFFFFFE,
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0x00000000,
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0x7FFFFFFC
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};
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/*
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* external tables
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*/
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extern char em_flag[];
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extern short em_ptyp[];
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extern char em_mnem[][4];
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extern char em_pseu[][4];
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/*
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* routines
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*/
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int get16();
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long get32();
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main(argc,argv) char **argv; {
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progname = argv[0];
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if (argc >= 2) {
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filename = argv[1];
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if (freopen(argv[1],"r",stdin) == NULL)
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fatal("can't open %s",argv[1]);
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}
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if (argc >= 3)
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if (freopen(argv[2],"w",stdout) == NULL)
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fatal("can't create %s",argv[2]);
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if (get16() != sp_magic)
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fatal("bad magic word");
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/* In System III the array is called _ctype[] without the trailing '_' */
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(_ctype_+1)['_'] = (_ctype_+1)['a'];
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while (nextline())
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;
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return(errors ? -1 : 0);
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}
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/* ----- copy ----- */
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int nextline() {
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register t;
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lineno++;
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argnum = 1;
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switch (t = table1()) {
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case EOF:
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return(0);
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case sp_fmnem:
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instr();
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break;
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case sp_fpseu:
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pseudo();
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break;
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case sp_ilb1:
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case sp_ilb2:
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argnum = 0;
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putarg(sp_cst2);
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break;
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case sp_dlb1:
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case sp_dlb2:
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case sp_dnam:
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argnum = 0;
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putarg(t);
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break;
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default:
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error("unknown opcode %d",t);
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}
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putchar('\n');
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return(1);
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}
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instr() {
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register i,j,t;
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register long l;
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i = opcode - sp_fmnem;
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printf(" %s",em_mnem[i]);
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j = em_flag[i] & EM_PAR;
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if (j == PAR_NO)
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return;
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t = em_ptyp[j];
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t = getarg(t);
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/*
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* range checking
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*/
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switch (j) {
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case PAR_N:
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check(argval >= 0);
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break;
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case PAR_G:
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if (t != sp_cst2 && t != sp_cst4)
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break;
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check(argval >= 0);
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/* fall through */
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case PAR_L:
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l = argval >= 0 ? argval : -argval;
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check((l & ~wordmask[psize]) == 0);
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break;
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case PAR_W:
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if (t == sp_cend)
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break;
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check((argval & ~wordmask[wsize]) == 0);
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/* fall through */
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case PAR_S:
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check(argval != 0);
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/* fall through */
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case PAR_Z:
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check((argval & ~sizemask[wsize]) == 0);
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break;
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case PAR_O:
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check(argval != 0);
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check((argval & ~sizemask[wsize])==0 || (wsize % argval)==0);
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break;
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case PAR_B:
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t = sp_ilb2;
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break;
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case PAR_R:
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check(argval >= 0 && argval <= 2);
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break;
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}
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putarg(t);
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}
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pseudo() {
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register i,t;
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i = opcode;
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printf(" %s",em_pseu[i - sp_fpseu]);
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switch (i) {
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case ps_bss:
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case ps_hol:
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putarg(getarg(cst_ptyp));
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putarg(getarg(val_ptyp));
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putarg(getarg(ptyp(sp_cst2)));
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check(argval==0 || argval==1);
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break;
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case ps_rom:
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case ps_con:
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putarg(getarg(val_ptyp));
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while ((t = getarg(any_ptyp)) != sp_cend)
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putarg(t);
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break;
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case ps_mes:
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putarg(getarg(ptyp(sp_cst2)));
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if (argval == ms_emx) {
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putarg(getarg(ptyp(sp_cst2)));
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check(argval > 0 && argval <= 4);
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wsize = (int) argval;
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putarg(getarg(ptyp(sp_cst2)));
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check(argval > 0 && argval <= 4);
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psize = (int) argval;
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}
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while ((t = getarg(any_ptyp)) != sp_cend)
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putarg(t);
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break;
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case ps_exa:
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case ps_ina:
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putarg(getarg(sym_ptyp));
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break;
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case ps_exp:
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case ps_inp:
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putarg(getarg(ptyp(sp_pnam)));
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break;
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case ps_exc:
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putarg(getarg(ptyp(sp_cst2)));
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putarg(getarg(ptyp(sp_cst2)));
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break;
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case ps_pro:
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putarg(getarg(ptyp(sp_pnam)));
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putarg(getarg(cst_ptyp|ptyp(sp_cend)));
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break;
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case ps_end:
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putarg(getarg(cst_ptyp|ptyp(sp_cend)));
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break;
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default:
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error("bad pseudo %d",i);
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}
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}
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/* ----- input ----- */
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int getarg(typset) {
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register t,argtyp;
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argtyp = t = table2();
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if (t == EOF)
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fatal("unexpected EOF");
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t -= sp_fspec;
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assert(t >= 0 && t < 16);
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t = 1 << t;
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if ((typset & t) == 0)
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error("bad argument type %d",argtyp);
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return(argtyp);
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}
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int table1() {
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register i;
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i = get8();
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if (i < sp_fmnem+sp_nmnem && i >= sp_fmnem) {
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opcode = i;
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return(sp_fmnem);
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}
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if (i < sp_fpseu+sp_npseu && i >= sp_fpseu) {
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opcode = i;
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return(sp_fpseu);
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}
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if (i < sp_filb0+sp_nilb0 && i >= sp_filb0) {
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argval = i - sp_filb0;
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return(sp_ilb2);
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}
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return(table3(i));
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}
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int table2() {
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register i;
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i = get8();
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if (i < sp_fcst0+sp_ncst0 && i >= sp_fcst0) {
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argval = i - sp_zcst0;
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return(sp_cst2);
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}
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return(table3(i));
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}
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int table3(i) {
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long consiz;
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switch(i) {
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case sp_ilb1:
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argval = get8();
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break;
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case sp_dlb1:
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dlbval = get8();
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break;
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case sp_dlb2:
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dlbval = get16();
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if ( dlbval<0 ) {
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error("illegal data label .%d",dlbval);
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dlbval=0 ;
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}
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break;
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case sp_cst2:
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argval = get16();
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break;
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case sp_ilb2:
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argval = get16();
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if ( argval<0 ) {
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error("illegal instruction label %ld",argval);
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argval=0 ;
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}
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break;
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case sp_cst4:
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argval = get32();
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break;
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case sp_dnam:
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case sp_pnam:
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getstring(1);
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break;
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case sp_scon:
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getstring(0);
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break;
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case sp_doff:
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offtyp = getarg(sym_ptyp);
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getarg(cst_ptyp);
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break;
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case sp_icon:
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case sp_ucon:
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case sp_fcon:
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getarg(cst_ptyp);
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consiz = (long) argval;
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getstring(0);
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argval = consiz;
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break;
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}
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return(i);
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}
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int get16() {
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register int l_byte, h_byte;
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l_byte = get8();
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h_byte = get8();
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if ( h_byte>=128 ) h_byte -= 256 ;
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return l_byte | (h_byte*256) ;
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}
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long get32() {
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register long l;
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register int h_byte;
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l = get8(); l |= (unsigned)get8()*256 ; l |= get8()*256L*256L ;
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h_byte = get8() ;
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if ( h_byte>=128 ) h_byte -= 256 ;
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return l | (h_byte*256L*256*256L) ;
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}
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getstring(ident) {
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register char *p;
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register n;
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getarg(cst_ptyp);
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if (argval < 0 || argval > MAXSTR)
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fatal("string/identifier too long");
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strsiz = n = argval;
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p = string;
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while (--n >= 0)
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*p++ = get8();
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if (ident) {
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if (!isascii(string[0]) || !isalpha(string[0])) {
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identerror();
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return;
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}
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for (n=strsiz,p=string+1;--n>0;p++)
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if (!isascii(*p) || !isalnum(*p)) {
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identerror();
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return;
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}
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}
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}
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/* ----- output ----- */
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putarg(t) {
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if (argnum != 0)
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putchar(argnum == 1 ? ' ' : ',');
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argnum++;
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puttyp(t);
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}
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puttyp(t) {
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switch (t) {
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case sp_ilb1:
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case sp_ilb2:
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printf("*%d",(int) argval);
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break;
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case sp_dlb1:
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case sp_dlb2:
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printf(".%d",dlbval);
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break;
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case sp_dnam:
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putstr(0,0);
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break;
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case sp_cst2:
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case sp_cst4:
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printf("%ld",argval);
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break;
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case sp_doff:
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puttyp(offtyp);
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if (argval >= 0) putchar('+');
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printf("%ld",argval);
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break;
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case sp_pnam:
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putstr('$',0);
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break;
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case sp_scon:
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putstr('\'','\'');
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break;
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case sp_icon:
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putstr(0,'I');
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printf("%ld",argval);
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break;
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case sp_ucon:
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putstr(0,'U');
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printf("%ld",argval);
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break;
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case sp_fcon:
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putstr(0,'F');
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printf("%ld",argval);
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break;
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case sp_cend:
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putchar('?');
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break;
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}
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}
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putstr(c,c2) register c; {
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register char *p;
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if (c)
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putchar(c);
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p = string;
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while (--strsiz >= 0) {
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c = *p++ & 0377;
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if (c >= 040 && c < 0177) {
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if (c == '\'' || c == '\\')
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putchar('\\');
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putchar(c);
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} else
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printf("\\%03o",c);
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}
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if (c2)
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putchar(c2);
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}
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/* ----- error handling ----- */
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fail_check() {
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error("argument range error");
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}
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identerror() {
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error("'%s' is not a correct identifier",string);
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}
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/* VARARGS */
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error(s,a1,a2,a3,a4) char *s; {
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fprintf(stderr,
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"%s: line %d: ",
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filename ? filename : progname,
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lineno);
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fprintf(stderr,s,a1,a2,a3,a4);
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fprintf(stderr,"\n");
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errors++;
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}
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/* VARARGS */
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fatal(s,a1,a2,a3,a4) char *s; {
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error(s,a1,a2,a3,a4);
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exit(-1);
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}
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