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parser.y
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/* ----------------------------------------------------------------------
* FILE: as31.y
* PACKAGE: as31 - 8031/8051 Assembler.
*
* DESCRIPTION:
* This file contains the yacc parser for the assembler.
* Related to this are the following:
* error(), warn(), yyerror()
* genbyte(), genword(), genstr(), makeop()
*
*
* REVISION HISTORY:
* Jan. 19, 1990 - Created. (Ken Stauffer)
*
* AUTHOR:
* All code in this file written by Ken Stauffer (University of Calgary).
* January 1990.
*
*/
%{
#include <stdio.h>
#include <stdlib.h>
#define NOPE
#include "as31.h"
#undef NOPE
#define YYSTYPE union ystack
static unsigned char bytebuf[1024]; /* used by dumplist() */
static int bytecount;
void yyerror(const char *s);
int makeop(struct opcode * op, struct mode *m, int add);
void inclc(int i);
char *padline(char *line);
void dumplist(char *txt, int show);
void genbyte(int b);
void genstr(const char *s);
void genword(unsigned long w);
/* ------------------------ G R A M M E R ----------------------------- */
%}
%token STRING
%token D_ORG
%token D_BYTE
%token D_WORD
%token D_SKIP
%token D_EQU
%token D_FLAG
%token D_END
%token ACALL
%token ADD
%token ADDC
%token AJMP
%token ANL
%token CJNE
%token CLR
%token CPL
%token DA
%token DEC
%token DIV
%token DJNZ
%token INC
%token JB
%token JBC
%token JC
%token JMP
%token JNB
%token JNC
%token JNZ
%token JZ
%token LCALL
%token LJMP
%token MOV
%token MOVC
%token MOVX
%token NOP
%token MUL
%token ORL
%token POP
%token PUSH
%token RET
%token RETI
%token RL
%token RLC
%token RR
%token RRC
%token SETB
%token SJMP
%token SUBB
%token SWAP
%token XCH
%token XCHD
%token XRL
%token AB
%token A
%token C
%token PC
%token DPTR
%token BITPOS
%token R0
%token R1
%token R2
%token R3
%token R4
%token R5
%token R6
%token R7
%token VALUE
%token SYMBOL
%left '+' '-'
%left '*' '/' '%'
%left '|' '&'
%left '>' '<'
%start program
%%
program : linelist
{
}
;
linelist : linelist line
| line
;
line : undefsym ':' linerest
{
if (abort_asap) {YYABORT;}
if( pass1 ) {
$1.sym->type = LABEL;
$1.sym->value = lc;
}
inclc($3.value);
bytecount = 0;
}
| linerest { inclc($1.value); bytecount = 0; }
;
linerest : directive '\n' {
$$.value = $1.value;
if( dashl && pass2 )
dumplist($2.str,1);
}
| instr '\n' {
$$.value = $1.value;
if( dashl && pass2 )
dumplist($2.str,1);
}
| '\n' {
$$.value = 0;
if( dashl && pass2 )
dumplist($1.str,0);
}
| error {
seek_eol();
}
'\n' {
$$.value = 0;
if( dashl && pass2 )
dumplist($1.str,0);
}
;
/* --------------------
* DIRECTIVES:
*
*/
directive : '.' D_ORG defexpr
{
lc = $3.val.v;
if( pass2 ) emitaddr(lc);
bytecount = 0;
$$.value = 0;
}
| '.' D_BYTE blist { $$.value = $3.value; }
| '.' D_WORD wlist { $$.value = $3.value; }
| '.' D_SKIP defexpr { $$.value = $3.val.v;
if( pass2 )
emitaddr(lc+$$.value); }
| '.' D_EQU undefsym ',' expr
{
if( $5.val.d == 0 )
warn("Expression is undefined in pass 1");
$3.sym->type = LABEL;
$3.sym->value = $5.val.v;
$$.value = 0;
}
| '.' D_FLAG SYMBOL ',' flag
{
$3.sym->type = LABEL;
$3.sym->value = $5.value;
$$.value = 0;
}
| '.' D_END { $$.value = 0; }
;
defexpr : expr
{
if( $1.val.d == 0 )
warn("Expression is undefined in pass 1");
if( !(isbit16($1.val.v)) )
warn("Value greater than 16-bits");
$$.value = $1.val.v;
}
;
flag : flagv BITPOS
{
if( !isbit8($1.value) )
warn("Bit address exceeds 8-bits");
if( isbmram($1.value) )
$$.value = ($1.value-0x20)*8+ $2.value;
else if( isbmsfr($1.value) )
$$.value = $1.value + $2.value;
else
warn("Invalid bit addressable RAM location");
}
;
flagv : SYMBOL
{
if( $1.sym->type == UNDEF )
warn("Symbol %s must be defined in pass 1",$1.sym->name);
$$.value = $1.sym->value;
}
| VALUE { $$.value = $1.value; }
;
undefsym : SYMBOL
{
if( $1.sym->type != UNDEF && pass1)
warn("Attempt to redefine symbol: %s",$1.sym->name);
$$.sym = $1.sym;
}
;
blist : blist ',' data8
{
if( pass2 ) genbyte($3.value);
$$.value = $1.value + 1;
}
| blist ',' STRING
{
if( pass1 )
$$.value = $1.value + $3.value;
else {
$$.value = $1.value + strlen($3.str);
genstr($3.str);
free($3.str);
}
}
| data8
{
if( pass2 ) genbyte($1.value);
$$.value = 1;
}
| STRING
{
if( pass1 )
$$.value = $1.value;
else {
$$.value = strlen($1.str);
genstr($1.str);
free($1.str);
}
}
;
wlist : wlist ',' data16
{
if( pass2 ) genword($3.value);
$$.value = $1.value + 2;
}
| data16
{
if( pass2 ) genword($1.value);
$$.value = 2;
}
;
/* --------------------
* EXPRESSIONS:
*
*/
expr : '*' { $$.val.v = lc;
$$.val.d = 1; }
| '(' expr ')' { $$.val.v = $2.val.v;
$$.val.d = $2.val.d; }
| '-' expr %prec '*' { $$.val.v = -$2.val.v;
$$.val.d = $2.val.d; }
| expr '|' expr { $$.val.v = $1.val.v | $3.val.v;
$$.val.d = $1.val.d && $3.val.d; }
| expr '&' expr { $$.val.v = $1.val.v & $3.val.v;
$$.val.d = $1.val.d && $3.val.d; }
| expr '*' expr { $$.val.v = $1.val.v * $3.val.v;
$$.val.d = $1.val.d && $3.val.d; }
| expr '/' expr { $$.val.v = $1.val.v / $3.val.v;
$$.val.d = $1.val.d && $3.val.d; }
| expr '%' expr { $$.val.v = $1.val.v % $3.val.v;
$$.val.d = $1.val.d && $3.val.d; }
| expr '-' expr { $$.val.v = $1.val.v - $3.val.v;
$$.val.d = $1.val.d && $3.val.d; }
| expr '+' expr { $$.val.v = $1.val.v + $3.val.v;
$$.val.d = $1.val.d && $3.val.d; }
| expr '>' '>' expr { $$.val.v = $1.val.v >> $4.val.v;
$$.val.d = $1.val.d && $4.val.d; }
| expr '<' '<' expr { $$.val.v = $1.val.v << $4.val.v;
$$.val.d = $1.val.d && $4.val.d; }
| SYMBOL
{
if( pass1 ) {
$$.val.v = $1.sym->value;
$$.val.d = ($1.sym->type != UNDEF);
}
else {
if( $1.sym->type == UNDEF )
warn("Undefined symbol %s",$1.sym->name);
$$.val.v = $1.sym->value;
$$.val.d = 1;
}
}
| VALUE { $$.val.v = $1.val.v; $$.val.d=1; }
;
/* --------------------
* INSTRUCTIONS:
*
*/
instr : NOP
{ $$.value = makeop($1.op,NULL,0); }
| ACALL addr11
{ $$.value = makeop($1.op,&$2.mode,0); }
| AJMP addr11
{ $$.value = makeop($1.op,&$2.mode,0); }
| ADD two_op1
{ $$.value = makeop($1.op,&$2.mode,0); }
| ADDC two_op1
{ $$.value = makeop($1.op,&$2.mode,0); }
| SUBB two_op1
{ $$.value = makeop($1.op,&$2.mode,0); }
| XRL two_op1
{ $$.value = makeop($1.op,&$2.mode,0); }
| XRL two_op2
{ $$.value = makeop($1.op,&$2.mode,4); }
| ANL two_op1
{ $$.value = makeop($1.op,&$2.mode,0); }
| ANL two_op2
{ $$.value = makeop($1.op,&$2.mode,4); }
| ANL two_op3
{ $$.value = makeop($1.op,&$2.mode,6); }
| ORL two_op1
{ $$.value = makeop($1.op,&$2.mode,0); }
| ORL two_op2
{ $$.value = makeop($1.op,&$2.mode,4); }
| ORL two_op3
{ $$.value = makeop($1.op,&$2.mode,6); }
| XCH two_op1
{ if( get_md($2.mode) == 3 )
warn("Immediate mode is illegal");
$$.value = makeop($1.op,&$2.mode,0);
}
| INC single_op1
{ $$.value = makeop($1.op,&$2.mode,0); }
| INC DPTR
{ $$.value = makeop($1.op,NULL,4); }
| DEC single_op1
{ $$.value = makeop($1.op,&$2.mode,0); }
| DA A
{ $$.value = makeop($1.op,NULL,0); }
| DIV AB
{ $$.value = makeop($1.op,NULL,0); }
| JMP '@' A '+' DPTR
{ $$.value = makeop($1.op,NULL,0); }
| JMP '@' DPTR '+' A
{ $$.value = makeop($1.op,NULL,0); }
| MUL AB
{ $$.value = makeop($1.op,NULL,0); }
| RET
{ $$.value = makeop($1.op,NULL,0); }
| RETI
{ $$.value = makeop($1.op,NULL,0); }
| RL A
{ $$.value = makeop($1.op,NULL,0); }
| RLC A
{ $$.value = makeop($1.op,NULL,0); }
| RR A
{ $$.value = makeop($1.op,NULL,0); }
| RRC A
{ $$.value = makeop($1.op,NULL,0); }
| SWAP A
{ $$.value = makeop($1.op,NULL,0); }
| XCHD two_op1
{ if( get_md($2.mode) != 2 )
warn("Invalid addressing mode");
$$.value = makeop($1.op,&$2.mode,-2); }
| CLR single_op2
{ $$.value = makeop($1.op,&$2.mode,0); }
| CPL single_op2
{ $$.value = makeop($1.op,&$2.mode,0); }
| SETB single_op2
{ if( get_md($2.mode) == 0 )
warn("Invalid addressing mode");
$$.value = makeop($1.op,&$2.mode,-1); }
| PUSH data8
{
struct mode tmp;
set_md(tmp,0);
set_ov(tmp,0);
set_sz(tmp,1);
set_b1(tmp,$2.value);
$$.value = makeop($1.op,&tmp,0);
}
| POP data8
{
struct mode tmp;
set_md(tmp,0);
set_ov(tmp,0);
set_sz(tmp,1);
set_b1(tmp,$2.value);
$$.value = makeop($1.op,&tmp,0);
}
| LJMP addr16
{ $$.value = makeop($1.op,&$2.mode,0); }
| LCALL addr16
{ $$.value = makeop($1.op,&$2.mode,0); }
| JC relative
{ $$.value = makeop($1.op,&$2.mode,0); }
| JNC relative
{ $$.value = makeop($1.op,&$2.mode,0); }
| JNZ relative
{ $$.value = makeop($1.op,&$2.mode,0); }
| JZ relative
{ $$.value = makeop($1.op,&$2.mode,0); }
| SJMP relative
{ $$.value = makeop($1.op,&$2.mode,0); }
| CJNE three_op1
{ $$.value = makeop($1.op,&$2.mode,0); }
| JB two_op4
{ $$.value = makeop($1.op,&$2.mode,0); }
| JNB two_op4
{ $$.value = makeop($1.op,&$2.mode,0); }
| JBC two_op4
{ $$.value = makeop($1.op,&$2.mode,0); }
| DJNZ two_op5
{ $$.value = makeop($1.op,&$2.mode,0); }
| MOV two_op1
{ $$.value = makeop($1.op,&$2.mode,0); }
| MOV two_op2
{ $$.value = makeop($1.op,&$2.mode,4); }
| MOV two_op6
{ $$.value = makeop($1.op,&$2.mode,6); }
| MOVC A ',' '@' A '+' DPTR
{ $$.value = makeop($1.op,NULL,0); }
| MOVC A ',' '@' DPTR '+' A
{ $$.value = makeop($1.op,NULL,0); }
| MOVC A ',' '@' A '+' PC
{ $$.value = makeop($1.op,NULL,1); }
| MOVC A ',' '@' PC '+' A
{ $$.value = makeop($1.op,NULL,1); }
| MOVX A ',' '@' regi
{ $$.value = makeop($1.op,NULL,$5.value); }
| MOVX A ',' '@' DPTR
{ $$.value = makeop($1.op,NULL,2); }
| MOVX '@' regi ',' A
{ $$.value = makeop($1.op,NULL,$3.value+3); }
| MOVX '@' DPTR ',' A
{ $$.value = makeop($1.op,NULL,5); }
;
/* --------------------
* ADDRESSING MODES:
*
*/
two_op1 : A ',' reg
{
set_md($$.mode,0);
set_ov($$.mode, $3.value);
set_sz($$.mode, 0);
}
| A ',' data8
{
set_md($$.mode,1);
set_ov($$.mode,0);
set_sz($$.mode,1);
set_b1($$.mode,$3.value);
}
| A ',' '@' regi
{
set_md($$.mode,2);
set_ov($$.mode,$4.value);
set_sz($$.mode,0);
}
| A ',' '#' data8
{
set_md($$.mode,3);
set_ov($$.mode,0);
set_sz($$.mode,1);
set_b1($$.mode,$4.value);
}
;
two_op2 : data8 ',' A
{
set_md($$.mode,0);
set_ov($$.mode,0);
set_sz($$.mode,1);
set_b1($$.mode,$1.value);
}
| data8 ',' '#' data8
{
set_md($$.mode,1);
set_ov($$.mode,0);
set_sz($$.mode,2);
set_b1($$.mode,$1.value);
set_b2($$.mode,$4.value);
}
;
two_op3 : C ',' bit
{
set_md($$.mode,0);
set_ov($$.mode,0);
set_sz($$.mode,1);
set_b1($$.mode,$3.value);
}
| C ',' '/' bit
{
set_md($$.mode,1);
set_ov($$.mode,0);
set_sz($$.mode,1);
set_b1($$.mode,$4.value);
}
| C ',' '!' bit
{
set_md($$.mode,1);
set_ov($$.mode,0);
set_sz($$.mode,1);
set_b1($$.mode,$4.value);
}
;
two_op4 : bit ',' rel
{
set_md($$.mode,0);
set_ov($$.mode,0);
set_sz($$.mode,2);
set_b1($$.mode,$1.value);
set_b2($$.mode,$3.value);
}
;
two_op5 : reg ',' rel2
{
set_md($$.mode,0);
set_ov($$.mode,$1.value);
set_sz($$.mode,1);
set_b1($$.mode,$3.value);
}
| data8 ',' rel
{
set_md($$.mode,1);
set_ov($$.mode,0);
set_sz($$.mode,2);
set_b1($$.mode,$1.value);
set_b2($$.mode,$3.value);
}
;
two_op6 : reg ',' A
{
set_md($$.mode,0);
set_ov($$.mode,$1.value);
set_sz($$.mode,0);
}
| reg ',' data8
{
set_md($$.mode,1);
set_ov($$.mode,$1.value);
set_sz($$.mode,1);
set_b1($$.mode,$3.value);
}
| reg ',' '#' data8
{
set_md($$.mode,2);
set_ov($$.mode,$1.value);
set_sz($$.mode,1);
set_b1($$.mode,$4.value);
}
| data8 ',' reg
{
set_md($$.mode,3);
set_ov($$.mode,$3.value);
set_sz($$.mode,1);
set_b1($$.mode,$1.value);
}
| data8 ',' data8
{
set_md($$.mode,4);
set_ov($$.mode,0);
set_sz($$.mode,2);
set_b1($$.mode,$3.value);
set_b2($$.mode,$1.value);
}
| data8 ',' '@' regi
{
set_md($$.mode,5);
set_ov($$.mode,$4.value);
set_sz($$.mode,1);
set_b1($$.mode,$1.value);
}
| '@' regi ',' A
{
set_md($$.mode,6);
set_ov($$.mode,$2.value);
set_sz($$.mode,0);
}
| '@' regi ',' data8
{
set_md($$.mode,7);
set_ov($$.mode,$2.value);
set_sz($$.mode,1);
set_b1($$.mode,$4.value);
}
| '@' regi ',' '#' data8
{
set_md($$.mode,8);
set_ov($$.mode,$2.value);
set_sz($$.mode,1);
set_b1($$.mode,$5.value);
}
| DPTR ',' '#' data16
{
set_md($$.mode,9);
set_ov($$.mode,0);
set_sz($$.mode,2);
set_b1($$.mode, ($4.value & 0xff00) >> 8 );
set_b2($$.mode, ($4.value & 0x00ff) );
}
| C ',' bit
{
set_md($$.mode,10);
set_ov($$.mode,0);
set_sz($$.mode,1);
set_b1($$.mode,$3.value);
}
/*
* Following two productions cannot be represented by:
*
* bit ',' C
*
* Because yacc gives tons of reduce/reduce errors if
* that is attempted.
*
*/
| data8 ',' C
{
set_md($$.mode,11);
set_ov($$.mode,0);
set_sz($$.mode,1);
set_b1($$.mode,$1.value);
}
| data8 BITPOS ',' C
{
if( pass2 ) {
if( !isbit8($1.value) )
warn("Bit address exceeds 8-bits");
if( isbmram($1.value) )
set_b1($$.mode, ($1.value-0x20)*8+ $2.value );
else if( isbmsfr($1.value) )
set_b1($$.mode, $1.value + $2.value );
else
warn("Invalid bit addressable RAM location");
}
set_md($$.mode,11);
set_ov($$.mode,0);
set_sz($$.mode,1);
}
;
single_op1 : A
{
set_md($$.mode,0);
set_ov($$.mode,0);
set_sz($$.mode,0);
}
| reg
{
set_md($$.mode,1);
set_ov($$.mode,$1.value);
set_sz($$.mode,0);
}
| data8
{
set_md($$.mode,2);
set_ov($$.mode,0);
set_sz($$.mode,1);
set_b1($$.mode,$1.value);
}
| '@' regi
{
set_md($$.mode,3);
set_ov($$.mode,$2.value);
set_sz($$.mode,0);
}
;
single_op2 : A
{
set_md($$.mode,0);
set_ov($$.mode,0);
set_sz($$.mode,0);
}
| C
{
set_md($$.mode,1);
set_ov($$.mode,0);
set_sz($$.mode,0);
}
| bit
{
set_md($$.mode,2);
set_ov($$.mode,0);
set_sz($$.mode,1);
set_b1($$.mode,$1.value);
}
;
three_op1 : A ',' data8 ',' rel
{
set_md($$.mode,0);
set_ov($$.mode,0);
set_sz($$.mode,2);
set_b1($$.mode,$3.value);
set_b2($$.mode,$5.value);
}
| A ',' '#' data8 ',' rel
{
set_md($$.mode,1);
set_ov($$.mode,0);
set_sz($$.mode,2);
set_b1($$.mode,$4.value);
set_b2($$.mode,$6.value);
}
| reg ',' '#' data8 ',' rel
{
set_md($$.mode,2);
set_ov($$.mode,$1.value);
set_sz($$.mode,2);
set_b1($$.mode,$4.value);
set_b2($$.mode,$6.value);
}
| '@' regi ',' '#' data8 ',' rel
{
set_md($$.mode,3);
set_ov($$.mode,$2.value);
set_sz($$.mode,2);
set_b1($$.mode,$5.value);
set_b2($$.mode,$7.value);
}
;
rel : expr
{
long offset;
if( pass2 ) {
offset = $1.val.v - (lc+3);
if( offset > 127 || offset < -128 )
warn("Relative offset exceeds -128 / +127");
$$.value = offset;
}
}
;
/*
* This production differs from the above, by 1 number!
*
*/
rel2 : expr
{
long offset;
if( pass2 ) {
offset = $1.val.v - (lc+2); /* different! */
if( offset > 127 || offset < -128 )
warn("Relative offset exceeds -128 / +127");
$$.value = offset;
}
}
;
bit : bitv BITPOS
{
if( pass2 ) {
if( !isbit8($1.value) )
warn("Bit address exceeds 8-bits");
if( isbmram($1.value) )
$$.value = ($1.value-0x20)*8+$2.value;
else if( isbmsfr($1.value) )
$$.value = $1.value + $2.value;
else
warn("Invalid bit addressable RAM location");
}
}
| bitv
{
if( pass2 ) {
if( !isbit8($1.value) )
warn("Bit address exceeds 8-bits");
$$.value = $1.value;
}
}
;
bitv : SYMBOL
{
if( $1.sym->type == UNDEF && pass2 )
warn("Symbol %s undefined",$1.sym->name);
$$.value = $1.sym->value;
}
| VALUE { $$.value = $1.value; }
;
reg : R0 { $$.value = 0; }
| R1 { $$.value = 1; }
| R2 { $$.value = 2; }
| R3 { $$.value = 3; }
| R4 { $$.value = 4; }
| R5 { $$.value = 5; }
| R6 { $$.value = 6; }
| R7 { $$.value = 7; }
;
regi : R0 { $$.value = 0; }
| R1 { $$.value = 1; }
| R2
{ $$.value = 0;
warn("Illegal indirect register: @r2"); }
| R3
{ $$.value = 0;
warn("Illegal indirect register: @r3"); }
| R4
{ $$.value = 0;
warn("Illegal indirect register: @r4"); }
| R5
{ $$.value = 0;
warn("Illegal indirect register: @r5"); }
| R6
{ $$.value = 0;
warn("Illegal indirect register: @r6"); }
| R7
{ $$.value = 0;
warn("Illegal indirect register: @r7"); }
;
data8 : expr
{
if( pass2 ) {
if( !isbit8($1.val.v) )
warn("Expression greater than 8-bits");
}
$$.value = $1.val.v;
}
;
data16 : expr
{
if( pass2 ) {
if( !isbit16($1.val.v) )
warn("Expression greater than 16-bits");
}
$$.value = $1.val.v;
}
;
addr11 : expr
{
if( pass2 ) {
if( !isbit16($1.val.v) )
warn("Address greater than 16-bits");
if( ($1.val.v & size11) != ((lc+2) & size11) )
warn("Address outside current 2K page");
}
set_md($$.mode,0);
set_ov($$.mode, ($1.val.v&0x0700)>>3 );
set_sz($$.mode,1);
set_b1($$.mode,$1.val.v&0x00ff);
}
;
addr16 : expr
{
if( pass2 ) {
if( !isbit16($1.val.v) )
warn("Address greater than 16-bits");
}
set_md($$.mode,0);
set_ov($$.mode, 0 );
set_sz($$.mode,2);
set_b1($$.mode, ($1.val.v & 0xff00 ) >> 8 );
set_b2($$.mode, ($1.val.v & 0x00ff ) );
}
;
relative : expr
{
long offset=0;
if( pass2 ) {
offset = $1.val.v - (lc+2);
if( offset>127 || offset<-128 )
warn("Relative offset exceeds -128 / +127");
}
set_md($$.mode,0);
set_ov($$.mode,0);
set_sz($$.mode,1);
set_b1($$.mode,offset);
}
;
%%
/* ---------------------------------------------------------------------- */
void yyerror(const char *s)
{
warn("%s near \"%s\"", s, get_last_token());
}
/* ----------------------------------------------------------------------
* makeop:
* This function makes an opcode based on the instruction symbol table
* entry, and an addressing mode structure.
* This function is called from both passes, but
* only generates code in pass 2.
*
* Resultant opcode bytes are passed to genbyte().
*
* Returns the nuumber of bytes that the instruction
* occupies.
*
*/
int makeop(struct opcode * op, struct mode *m, int add)
{
register unsigned int newop;
if( m == NULL ) {
if(pass2) genbyte(op->bytes[0+add]);
return(1);
}
if( pass2 ) {