/* Copyright (c) 1980 Regents of the University of California */
-static char sccsid[] = "@(#)ascode.c 4.4 %G%";
+static char sccsid[] = "@(#)ascode.c 4.7 %G%";
#include <stdio.h>
#include "as.h"
#include "assyms.h"
+/*
+ * Loader reference types (plust PCREL) to bytes and lg bytes
+ */
+/* LEN1 LEN1+PC LEN2 LEN2+PC LEN4 LEN4+PC LEN8 LEN8+PC*/
+int reflen[] = /* {LEN*+PCREL} ==> number of bytes */
+{0, 0, 1, 1, 2, 2, 4, 4, 8, 8};
+int lgreflen[] = /* {LEN*+PCREL} ==> lg number of bytes */
+{-1, -1, 0, 0, 1, 1, 2, 2, 3, 3};
+
+/*
+ * Sizes to Loader reference types and type flags
+ */
+/*0 1 2 3 4 5 6 7 8*/
+int len124[] = /* {1,2,4,8} ==> {LEN1, LEN2, LEN4, LEN8} */
+{0, LEN1, LEN2, 0, LEN4, 0, 0, 0, LEN8};
+char mod124[] = /* {1,2,4,8} ==> {bits to construct operands */
+{0, 0x00, 0x20, 0, 0x40, 0, 0, 0, 0};
+int type_124[] = /* {1,2,4,8} ==> {TYPB, TYPW, TYPL, TYPQ} */
+{0, TYPB, TYPW, 0, TYPL, 0, 0, 0, TYPQ};
+
+/*
+ * type flags to Loader reference and byte lengths
+ */
+/*TYPB TYPW TYPL TYPQ TYPF TYPD*/
+int ty_NORELOC[] = /* {TYPB..TYPD} ==> {1 if relocation not OK */
+{0, 0, 0, 1, 1, 1};
+int ty_LEN[] = /* {TYPB..TYPD} ==> {LEN1..LEN8} */
+{LEN1, LEN2, LEN4, LEN8, LEN4, LEN8};
+int ty_nbyte[] = /* {TYPB..TYPD} ==> {1,2,4,8} */
+{1, 2, 4, 8, 4, 8};
+int ty_nlg[] = /* {TYPB..TYPD} ==> lg{1,2,4,8} */
+{0, 1, 2, 3, 2, 3};
+
insout(op, ap, nact)
struct arg *ap;
{
* Check argument compatability with instruction template
*/
for (ap_walk = ap, i = 1; i <= nact; ap_walk++, i++){
- ap_type = ap_walk->a_type;
+ ap_type = ap_walk->a_atype;
ap_type_mask = ap_type & AMASK;
- switch( (fetcharg(ip, i-1)) & AMASK){ /* type of fp */
- case ACCB:
+ /*
+ * The switch value is >> by 3 so that the switch
+ * code is dense, not implemented as a sequence
+ * of branches but implemented as a casel.
+ * In addition, cases ACCI and ACCR are added to force
+ * dense switch code.
+ */
+ switch( ((fetcharg(ip, i-1)) & ACCESSMASK)>>3){ /* type of fp */
+ case ACCI >> 3:
+ case ACCR >> 3:
+ break;
+ case ACCB >> 3:
if ( !((ap_type_mask == AEXP) || (ap_type_mask == AIMM)) ){
yyerror("arg %d, branch displacement must be an expression",i);
return;
}
break;
- case ACCA:
+ case ACCA >> 3:
switch(ap_type_mask){
case AREG: yyerror("arg %d, addressing a register",i);
return;
}
}
break;
- case ACCM:
- case ACCW:
+ case ACCM >> 3:
+ case ACCW >> 3:
switch(ap_type_mask){
case AIMM: if (!(ap_type&ASTAR)) {
yyerror("arg %d, modifying a constant",i);
return;
case AIMM: yyerror("arg %d, indexing a constant",i);
return;
- case DECR:
- case INCR: if (ap_walk->a_areg1==ap_walk->a_areg2) {
+ case ADECR:
+ case AINCR: if (ap_walk->a_areg1==ap_walk->a_areg2) {
yyerror("arg %d, indexing with modified register",i);
return;
}
}
extern int d124;
- int len124[] = {0,LEN1,LEN2,0,LEN4};
- char mod124[] = {0,0x00,0x20,0,0x40};
putins(op, ap, n)
/*
register struct arg *ap;
{
register struct exp *xp;
- register int a;
- int i,xtrab;
+ register int argtype;
+ int i;
+ int reloc_how;
#ifdef DEBUG
fflush(stdout);
dotp->e_xvalue += n+1; /* 1 for the opcode, at least 1 per arg */
for (i=0; i<n; i++,ap++) { /* some args take more than 1 byte */
- a = ap->a_atype;
- if (a & AINDX)
+ argtype = ap->a_atype;
+ if (argtype & AINDX)
dotp->e_xvalue++;
- switch (a&~(AINDX|ASTAR)) {
+ /*
+ * This switch has been fixed by enumerating the no action
+ * alternatives (those that have 1 one byte of code)
+ * so that a casel instruction is emitted.
+ */
+ switch (argtype&~(AINDX|ASTAR)) {
+ case AREG:
+ case ABASE:
+ case ADECR:
+ case AINCR:
+ break;
case AEXP:
- a = fetcharg(itab[op], i);
- if (a == ACCB+TYPB)
+ argtype = fetcharg(itab[op], i);
+ if (argtype == ACCB+TYPB)
break;
- if (a==ACCB+TYPW){
+ if (argtype==ACCB+TYPW){
dotp->e_xvalue++;
break;
}
dotp->e_xvalue += ap->a_dispsize;
break;
}
- if (xp->e_xvalue==0 && !(a&ASTAR))
+ if (xp->e_xvalue==0 && !(argtype&ASTAR))
break;
dotp->e_xvalue++;
if ((xp->e_xvalue<MINBYTE) || (xp->e_xvalue>MAXBYTE))
break;
case AIMM:
- if (ap->a_atype&ASTAR) a=TYPL;
+ if (ap->a_atype&ASTAR) argtype=TYPL;
else {
- a = fetcharg(itab[op], i);
- if (a&ACCA)
- a = TYPL;
+ argtype = fetcharg(itab[op], i);
+ if (argtype&ACCA)
+ argtype = TYPL;
else
- a &= TYPMASK;
+ argtype &= TYPMASK;
xp = ap->a_xp;
if ( ((xp->e_xtype&XTYPE)==XABS)
&& (!(xp->e_xtype&XFORW))
&& (xp->e_xvalue>=0)
&& (xp->e_xvalue<=63)
&& (xp->e_yvalue == 0)
- && (a != TYPD)
- && (a != TYPF)
+ && (argtype != TYPD)
+ && (argtype != TYPF)
)
break;
}
- switch (a) {
+ switch (argtype) {
case TYPD:
case TYPF:
if ( !(((xp->e_xtype&XTYPE)==XABS)
&& (slitflt(xp)))
){
/* it is NOT short */
- dotp->e_xvalue += ((a==TYPF)?
+ dotp->e_xvalue += ((argtype==TYPF)?
4 : 8);
}
break;
dotp->e_xvalue += 2;break;
case TYPB:
dotp->e_xvalue += 1;break;
- } /*end of the switch on a*/
+ } /*end of the switch on argtype*/
} /*end of the switch on the type*/
} /*end of looping for all arguments*/
return;
#endif VMS
for (i=0; i<n; i++,ap++) {/* now for the arguments */
- a=ap->a_atype;
+ argtype=ap->a_atype;
xp=ap->a_xp;
- xtrab=0;
- if (a&AINDX) {
+ reloc_how = TYPNONE;
+ if (argtype&AINDX) {
#ifdef UNIX
{ outb(0x40 | ap->a_areg2); }
#endif UNIX
*vms_obj_ptr++ = (0x40 | ap->a_areg2);
dotp->e_xvalue += 1; }
#endif VMS
- a &= ~AINDX;
+ argtype &= ~AINDX;
}
- if (a&ASTAR) {
+ if (argtype&ASTAR) {
ap->a_areg1 |= 0x10;
- a &= ~ASTAR;
+ argtype &= ~ASTAR;
}
- switch (a) {
+ switch (argtype) {
case AREG: /* %r */
ap->a_areg1 |= 0x50;
break;
ap->a_areg1 |= 0x80;
break;
case AEXP: /* expr */
- a = fetcharg(itab[op], i);
- if (a == ACCB+TYPB) {
- ap->a_areg1 = a =
+ argtype = fetcharg(itab[op], i);
+ if (argtype == ACCB+TYPB) {
+ ap->a_areg1 = argtype =
xp->e_xvalue - (dotp->e_xvalue + 1);
- if (a<MINBYTE || a>MAXBYTE)
+ if (argtype<MINBYTE || argtype>MAXBYTE)
yyerror("Branch too far"); break;
}
- if (a == ACCB+TYPW) {
- ap->a_areg1 = a = xp->e_xvalue
+ if (argtype == ACCB+TYPW) {
+ ap->a_areg1 = argtype = xp->e_xvalue
-= dotp->e_xvalue + 2;
xp->e_xtype = XABS;
- if (a<MINWORD || a>MAXWORD)
+ if (argtype<MINWORD || argtype>MAXWORD)
yyerror("Branch too far");
- xp->e_xvalue = a>>8;
- xtrab = LEN1;
+ xp->e_xvalue = argtype>>8;
+ reloc_how = TYPB;
break;
}
/* reduces to expr(pc) mode */
ap->a_areg1 |= (0xAF + mod124[ap->a_dispsize]);
- xtrab = len124[ap->a_dispsize]+PCREL;
+ reloc_how = type_124[ap->a_dispsize] + RELOC_PCREL;
break;
case ADISP: /* expr(%r) */
ap->a_areg1 |= 0xA0;
if ((xp->e_xtype&XTYPE)!=XABS || xp->e_xtype&XFORW){
ap->a_areg1 += mod124[ap->a_dispsize];
- xtrab=len124[ap->a_dispsize];
+ reloc_how = type_124[ap->a_dispsize];
break;
}
if (xp->e_xvalue==0 && !(ap->a_areg1&0x10)) {
ap->a_areg1 ^= 0xC0;
break;
}
- xtrab=LEN1;
+ reloc_how = TYPB;
if ((xp->e_xvalue<MINBYTE) || (xp->e_xvalue>MAXBYTE)){
ap->a_areg1 += 0x20;
- xtrab=LEN2;
+ reloc_how = TYPW;
}
if ((xp->e_xvalue<MINWORD) || (xp->e_xvalue>MAXWORD)){
ap->a_areg1 += 0x20;
- xtrab=LEN4;
+ reloc_how = TYPL;
}
break;
case AIMM: /* $expr */
if (ap->a_atype&ASTAR)
- a=TYPL;
+ argtype=TYPL;
else {
- a = fetcharg(itab[op], i);
- if (a&ACCA)
- a=TYPL;
+ argtype = fetcharg(itab[op], i);
+ if (argtype&ACCA)
+ argtype=TYPL;
else
- a &= TYPMASK;
+ argtype &= TYPMASK;
if ( ( (xp->e_xtype&XTYPE) == XABS)
&& !(xp->e_xtype&XFORW)
&& (xp->e_xvalue >= 0)
&& (xp->e_xvalue <= 63)
&& (xp->e_yvalue == 0)
- && (a != TYPF)
- && (a != TYPD) ) {
+ && (argtype != TYPF)
+ && (argtype != TYPD) ) {
ap->a_areg1 = xp->e_xvalue;
break;
}
}
ap->a_areg1 |= 0x8F;
- switch (a) {
- case TYPD:
- case TYPF:
+ reloc_how = argtype;
+ if (reloc_how == TYPD || reloc_how == TYPF){
if ( ((xp->e_xtype&XTYPE)==XABS)
&& (!(xp->e_xtype&XFORW))
&& (slitflt(xp))
){
+ reloc_how = TYPNONE;
ap->a_areg1=extlitflt(xp);
- } else {
- xtrab = (a==TYPF) ? LEN4: LEN8;
}
- break;
- case TYPQ: xtrab = LEN8; break;
- case TYPL: xtrab = LEN4; break;
- case TYPW: xtrab = LEN2; break;
- case TYPB: xtrab = LEN1; break;
}
break;
- } /*end of the switch on a*/
+ } /*end of the switch on argtype*/
/*
* use the first byte to describe the argument
*/
vms_obj_ptr=sobuf+1;
}
#endif VMS
- if (xtrab)
- /*
- * Floating point numbers are written to a.out
- * by outrel; they require that the least significant
- * 4 bytes of an 8 byte double precision number
- * immediately follow the field xvalue, which
- * they do.
- */
- outrel(&xp->e_xvalue, xtrab, xp->e_xtype, xp->e_xname);
+ if (reloc_how != TYPNONE)
+ outrel(xp, reloc_how);
} /*end of the for to pick up all arguments*/
}