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