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# include <stdio.h>
/*
Copyright ( c ) 2021 Devine Lu Linvega
Permission to use , copy , modify , and distribute this software for any
purpose with or without fee is hereby granted , provided that the above
copyright notice and this permission notice appear in all copies .
THE SOFTWARE IS PROVIDED " AS IS " AND THE AUTHOR DISCLAIMS ALL WARRANTIES
WITH REGARD TO THIS SOFTWARE .
*/
typedef unsigned char Uint8 ;
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typedef signed char Sint8 ;
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typedef unsigned short Uint16 ;
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typedef signed short Sint16 ;
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typedef struct {
char name [ 64 ] , items [ 16 ] [ 64 ] ;
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Uint8 len , refs ;
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} Macro ;
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typedef struct {
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char name [ 64 ] ;
unsigned int size ;
} Map ;
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typedef struct {
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char name [ 64 ] ;
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Uint8 refs , maps ;
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Uint16 addr ;
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Map map [ 16 ] ;
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} Label ;
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typedef struct {
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Uint8 data [ 256 * 256 ] , llen , mlen ;
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Uint16 ptr ;
Label labels [ 256 ] ;
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Macro macros [ 256 ] ;
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} Program ;
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Program p ;
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/* clang-format off */
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char ops [ ] [ 4 ] = {
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" BRK " , " NOP " , " LIT " , " LDR " , " STR " , " --- " , " JMP " , " JSR " ,
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" EQU " , " NEQ " , " GTH " , " LTH " , " AND " , " XOR " , " SHL " , " SHR " ,
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" POP " , " DUP " , " SWP " , " OVR " , " ROT " , " --- " , " CLN " , " STH " ,
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" ADD " , " SUB " , " MUL " , " DIV " , " --- " , " --- " , " --- " , " --- "
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} ;
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int scin ( char * s , char c ) { int i = 0 ; while ( s [ i ] ) if ( s [ i + + ] = = c ) return i - 1 ; return - 1 ; } /* string char index */
int scmp ( char * a , char * b , int len ) { int i = 0 ; while ( a [ i ] = = b [ i ] & & i < len ) if ( ! a [ i + + ] ) return 1 ; return 0 ; } /* string compare */
int slen ( char * s ) { int i = 0 ; while ( s [ i ] & & s [ + + i ] ) ; return i ; } /* string length */
int sihx ( char * s ) { int i = 0 ; char c ; while ( ( c = s [ i + + ] ) ) if ( ! ( c > = ' 0 ' & & c < = ' 9 ' ) & & ! ( c > = ' a ' & & c < = ' f ' ) & & ! ( c > = ' A ' & & c < = ' F ' ) ) return 0 ; return 1 ; } /* string is hexadecimal */
int shex ( char * s ) { int n = 0 , i = 0 ; char c ; while ( ( c = s [ i + + ] ) ) if ( c > = ' 0 ' & & c < = ' 9 ' ) n = n * 16 + ( c - ' 0 ' ) ; else if ( c > = ' A ' & & c < = ' F ' ) n = n * 16 + 10 + ( c - ' A ' ) ; else if ( c > = ' a ' & & c < = ' f ' ) n = n * 16 + 10 + ( c - ' a ' ) ; return n ; } /* string to num */
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char * scpy ( char * src , char * dst , int len ) { int i = 0 ; while ( ( dst [ i ] = src [ i ] ) & & i < len - 2 ) i + + ; dst [ i + 1 ] = ' \0 ' ; return dst ; } /* string copy */
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# pragma mark - Helpers
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/* clang-format on */
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# pragma mark - I / O
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void
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pushbyte ( Uint8 b , int lit )
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{
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if ( lit ) pushbyte ( 0x02 , 0 ) ;
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p . data [ p . ptr + + ] = b ;
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}
void
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pushshort ( Uint16 s , int lit )
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{
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if ( lit ) pushbyte ( 0x22 , 0 ) ;
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pushbyte ( ( s > > 8 ) & 0xff , 0 ) ;
pushbyte ( s & 0xff , 0 ) ;
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}
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void
pushtext ( char * s , int lit )
{
int i = 0 ;
char c ;
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if ( lit ) pushbyte ( 0x22 , 0 ) ;
while ( ( c = s [ i + + ] ) ) pushbyte ( c , 0 ) ;
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}
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Macro *
findmacro ( char * name )
{
int i ;
for ( i = 0 ; i < p . mlen ; + + i )
if ( scmp ( p . macros [ i ] . name , name , 64 ) )
return & p . macros [ i ] ;
return NULL ;
}
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Label *
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findlabel ( char * s )
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{
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int i , rng = scin ( s , ' . ' ) ;
char name [ 64 ] ;
scpy ( s , name , rng > 0 ? rng + 1 : 64 ) ;
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for ( i = 0 ; i < p . llen ; + + i )
if ( scmp ( p . labels [ i ] . name , name , 64 ) )
return & p . labels [ i ] ;
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return NULL ;
}
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Uint16
findlabeladdr ( char * s )
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{
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int i , o = 0 ;
char * param ;
Label * l = findlabel ( s ) ;
if ( scin ( s , ' . ' ) < 1 )
return l - > addr ;
param = s + scin ( s , ' . ' ) + 1 ;
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for ( i = 0 ; i < l - > maps ; + + i ) {
if ( scmp ( l - > map [ i ] . name , param , 64 ) )
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return l - > addr + o ;
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o + = l - > map [ i ] . size ;
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}
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printf ( " !!! Warning %s.%s \n " , l - > name , param ) ;
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return 0 ;
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}
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Uint8
findlabellen ( char * s )
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{
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int i ;
char * param ;
Label * l = findlabel ( s ) ;
if ( scin ( s , ' . ' ) < 1 )
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return l - > map [ 0 ] . size ;
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param = s + scin ( s , ' . ' ) + 1 ;
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for ( i = 0 ; i < l - > maps ; + + i )
if ( scmp ( l - > map [ i ] . name , param , 64 ) )
return l - > map [ i ] . size ;
printf ( " !!! Warning %s.%s \n " , l - > name , param ) ;
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return 0 ;
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}
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Uint8
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findopcode ( char * s )
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{
int i ;
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for ( i = 0 ; i < 0x20 ; + + i ) {
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int m = 0 ;
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char * o = ops [ i ] ;
if ( o [ 0 ] ! = s [ 0 ] | | o [ 1 ] ! = s [ 1 ] | | o [ 2 ] ! = s [ 2 ] )
continue ;
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while ( s [ 3 + m ] ) {
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if ( s [ 3 + m ] = = ' 2 ' ) i | = ( 1 < < 5 ) ; /* mode: short */
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if ( s [ 3 + m ] = = ' r ' ) i | = ( 1 < < 6 ) ; /* mode: return */
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if ( s [ 3 + m ] = = ' ? ' ) i | = ( 1 < < 7 ) ; /* mode: conditional */
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m + + ;
}
return i ;
}
return 0 ;
}
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char *
sublabel ( char * src , char * scope , char * name )
{
scpy ( scope , src , 64 ) ;
scpy ( " - " , src + slen ( src ) , 64 ) ;
scpy ( name , src + slen ( src ) , 64 ) ;
return src ;
}
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# pragma mark - Parser
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int
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error ( char * name , char * id )
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{
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printf ( " Error: %s[%s] \n " , name , id ) ;
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return 0 ;
}
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int
makemacro ( char * name , FILE * f )
{
Macro * m ;
char word [ 64 ] ;
if ( findmacro ( name ) )
return error ( " Macro duplicate " , name ) ;
if ( sihx ( name ) & & slen ( name ) % 2 = = 0 )
return error ( " Macro name is hex number " , name ) ;
if ( findopcode ( name ) )
return error ( " Macro name is invalid " , name ) ;
m = & p . macros [ p . mlen + + ] ;
scpy ( name , m - > name , 64 ) ;
while ( fscanf ( f , " %s " , word ) ) {
if ( word [ 0 ] = = ' { ' ) continue ;
if ( word [ 0 ] = = ' } ' ) break ;
scpy ( word , m - > items [ m - > len + + ] , 64 ) ;
}
printf ( " New macro: %s(%d items) \n " , m - > name , m - > len ) ;
return 1 ;
}
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int
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makelabel ( char * name , Uint16 addr )
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{
Label * l ;
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if ( findlabel ( name ) )
return error ( " Label duplicate " , name ) ;
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if ( sihx ( name ) & & slen ( name ) % 2 = = 0 )
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return error ( " Label name is hex number " , name ) ;
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if ( findopcode ( name ) )
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return error ( " Label name is invalid " , name ) ;
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l = & p . labels [ p . llen + + ] ;
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l - > addr = addr ;
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l - > refs = 0 ;
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scpy ( name , l - > name , 64 ) ;
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printf ( " New label: %s, at 0x%04x \n " , l - > name , l - > addr ) ;
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return 1 ;
}
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int
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makevariable ( char * name , Uint16 * addr , FILE * f )
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{
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Label * l ;
char word [ 64 ] ;
if ( ! makelabel ( name , * addr ) )
return error ( " Could not create variable " , name ) ;
l = findlabel ( name ) ;
while ( fscanf ( f , " %s " , word ) ) {
if ( word [ 0 ] = = ' { ' ) continue ;
if ( word [ 0 ] = = ' } ' ) break ;
scpy ( word , l - > map [ l - > maps ] . name , 64 ) ;
fscanf ( f , " %u " , & l - > map [ l - > maps ] . size ) ;
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* addr + = l - > map [ l - > maps + + ] . size ;
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}
return 1 ;
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}
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int
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skipblock ( char * w , int * cap , char a , char b )
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{
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if ( w [ 0 ] = = b ) {
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* cap = 0 ;
return 1 ;
}
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if ( w [ 0 ] = = a ) * cap = 1 ;
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if ( * cap ) return 1 ;
return 0 ;
}
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int
walktoken ( char * w )
{
Macro * m ;
if ( findopcode ( w ) | | scmp ( w , " BRK " , 4 ) )
return 1 ;
switch ( w [ 0 ] ) {
case ' = ' : return 4 ; /* STR helper (lit addr-hb addr-lb str) */
case ' ~ ' : return 4 ; /* LDR helper (lit addr-hb addr-lb ldr) */
case ' , ' : return 3 ; /* lit2 addr-hb addr-lb */
case ' . ' : return 2 ; /* addr-hb addr-lb */
case ' ^ ' : return 2 ; /* Relative jump: lit addr-offset */
case ' # ' : return ( slen ( w + 1 ) = = 2 ? 2 : 3 ) ;
}
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if ( ( m = findmacro ( w ) ) ) {
int i , res = 0 ;
for ( i = 0 ; i < m - > len ; + + i )
res + = walktoken ( m - > items [ i ] ) ;
return res ;
}
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return error ( " Unknown label in first pass " , w ) ;
}
int
parsetoken ( char * w )
{
Uint8 op = 0 ;
Label * l ;
Macro * m ;
if ( w [ 0 ] = = ' ^ ' & & ( l = findlabel ( w + 1 ) ) ) {
int off = l - > addr - p . ptr - 3 ;
if ( off < - 126 | | off > 126 ) {
printf ( " Address %s is too far(%d). \n " , w , off ) ;
return 0 ;
}
pushbyte ( ( Sint8 ) ( l - > addr - p . ptr - 3 ) , 1 ) ;
l - > refs + + ;
return 1 ;
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} else if ( w [ 0 ] = = ' = ' & & ( l = findlabel ( w + 1 ) ) ) {
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if ( ! findlabellen ( w + 1 ) | | findlabellen ( w + 1 ) > 2 )
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return error ( " Invalid store helper " , w ) ;
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pushshort ( findlabeladdr ( w + 1 ) , 1 ) ;
pushbyte ( findopcode ( findlabellen ( w + 1 ) = = 2 ? " STR2 " : " STR " ) , 0 ) ;
l - > refs + + ;
return 1 ;
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} else if ( w [ 0 ] = = ' ~ ' & & ( l = findlabel ( w + 1 ) ) ) {
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if ( ! findlabellen ( w + 1 ) | | findlabellen ( w + 1 ) > 2 )
return error ( " Invalid load helper " , w ) ;
pushshort ( findlabeladdr ( w + 1 ) , 1 ) ;
pushbyte ( findopcode ( findlabellen ( w + 1 ) = = 2 ? " LDR2 " : " LDR " ) , 0 ) ;
l - > refs + + ;
return 1 ;
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} else if ( ( op = findopcode ( w ) ) | | scmp ( w , " BRK " , 4 ) ) {
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pushbyte ( op , 0 ) ;
return 1 ;
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} else if ( w [ 0 ] = = ' . ' & & ( l = findlabel ( w + 1 ) ) ) {
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pushshort ( findlabeladdr ( w + 1 ) , 0 ) ;
l - > refs + + ;
return 1 ;
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} else if ( w [ 0 ] = = ' , ' & & ( l = findlabel ( w + 1 ) ) ) {
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pushshort ( findlabeladdr ( w + 1 ) , 1 ) ;
l - > refs + + ;
return 1 ;
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} else if ( w [ 0 ] = = ' # ' & & sihx ( w + 1 ) ) {
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if ( slen ( w + 1 ) = = 2 )
pushbyte ( shex ( w + 1 ) , 1 ) ;
else if ( slen ( w + 1 ) = = 4 )
pushshort ( shex ( w + 1 ) , 1 ) ;
else
return 0 ;
return 1 ;
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} else if ( ( m = findmacro ( w ) ) ) {
int i ;
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m - > refs + + ;
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for ( i = 0 ; i < m - > len ; + + i )
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if ( ! parsetoken ( m - > items [ i ] ) )
return 0 ;
return 1 ;
}
return 0 ;
}
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int
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pass1 ( FILE * f )
{
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int ccmnt = 0 , cbits = 0 ;
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Uint16 addr = 0 ;
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char w [ 64 ] , scope [ 64 ] , subw [ 64 ] ;
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printf ( " Pass 1 \n " ) ;
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while ( fscanf ( f , " %s " , w ) = = 1 ) {
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if ( skipblock ( w , & ccmnt , ' ( ' , ' ) ' ) ) continue ;
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if ( skipblock ( w , & cbits , ' [ ' , ' ] ' ) ) {
if ( w [ 0 ] = = ' [ ' | | w [ 0 ] = = ' ] ' )
continue ;
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if ( sihx ( w ) )
addr + = slen ( w ) = = 4 ? 2 : 1 ;
else
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addr + = slen ( w ) ;
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} else if ( w [ 0 ] = = ' % ' ) {
if ( ! makemacro ( w + 1 , f ) )
return error ( " Pass1 failed " , w ) ;
scpy ( w + 1 , scope , 64 ) ;
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} else if ( w [ 0 ] = = ' @ ' ) {
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if ( ! makelabel ( w + 1 , addr ) )
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return error ( " Pass1 failed " , w ) ;
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scpy ( w + 1 , scope , 64 ) ;
} else if ( w [ 0 ] = = ' $ ' ) {
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if ( ! makelabel ( sublabel ( subw , scope , w + 1 ) , addr ) )
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return error ( " Pass1 failed " , w ) ;
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} else if ( w [ 0 ] = = ' ; ' ) {
if ( ! makevariable ( w + 1 , & addr , f ) )
return error ( " Pass1 failed " , w ) ;
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} else if ( w [ 0 ] = = ' | ' ) {
if ( shex ( w + 1 ) < addr )
return error ( " Memory Overwrite " , w ) ;
addr = shex ( w + 1 ) ;
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} else
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addr + = walktoken ( w ) ;
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}
rewind ( f ) ;
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return 1 ;
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}
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int
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pass2 ( FILE * f )
{
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int ccmnt = 0 , cbits = 0 , ctemplate = 0 ;
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char w [ 64 ] , scope [ 64 ] , subw [ 64 ] ;
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printf ( " Pass 2 \n " ) ;
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while ( fscanf ( f , " %s " , w ) = = 1 ) {
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if ( w [ 0 ] = = ' ; ' ) continue ;
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if ( w [ 0 ] = = ' $ ' ) continue ;
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if ( w [ 0 ] = = ' % ' ) continue ;
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if ( skipblock ( w , & ccmnt , ' ( ' , ' ) ' ) ) continue ;
if ( skipblock ( w , & ctemplate , ' { ' , ' } ' ) ) continue ;
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if ( w [ 0 ] = = ' | ' ) {
p . ptr = shex ( w + 1 ) ;
continue ;
}
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if ( w [ 0 ] = = ' @ ' ) {
scpy ( w + 1 , scope , 64 ) ;
continue ;
}
if ( w [ 1 ] = = ' $ ' ) {
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scpy ( sublabel ( subw , scope , w + 2 ) , w + 1 , 64 ) ;
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}
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if ( skipblock ( w , & cbits , ' [ ' , ' ] ' ) ) {
if ( w [ 0 ] = = ' [ ' | | w [ 0 ] = = ' ] ' ) { continue ; }
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if ( slen ( w ) = = 4 & & sihx ( w ) )
pushshort ( shex ( w ) , 0 ) ;
else if ( slen ( w ) = = 2 & & sihx ( w ) )
pushbyte ( shex ( w ) , 0 ) ;
else
pushtext ( w , 0 ) ;
} else if ( ! parsetoken ( w ) ) {
return error ( " Unknown label in second pass " , w ) ;
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}
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}
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return 1 ;
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}
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void
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cleanup ( char * filename )
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{
int i ;
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printf ( " Assembled %s, %d labels, %d macros. \n \n " , filename , p . llen , p . mlen ) ;
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for ( i = 0 ; i < p . llen ; + + i )
if ( ! p . labels [ i ] . refs )
printf ( " --- Unused label: %s \n " , p . labels [ i ] . name ) ;
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for ( i = 0 ; i < p . mlen ; + + i )
if ( ! p . macros [ i ] . refs )
printf ( " --- Unused macro: %s \n " , p . macros [ i ] . name ) ;
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}
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int
main ( int argc , char * argv [ ] )
{
FILE * f ;
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if ( argc < 3 ) {
error ( " Input " , " Missing " ) ;
return 1 ;
}
if ( ! ( f = fopen ( argv [ 1 ] , " r " ) ) ) {
error ( " Open " , " Failed " ) ;
return 1 ;
}
if ( ! pass1 ( f ) | | ! pass2 ( f ) ) {
error ( " Assembly " , " Failed " ) ;
return 1 ;
}
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fwrite ( p . data , sizeof ( p . data ) , 1 , fopen ( argv [ 2 ] , " wb " ) ) ;
fclose ( f ) ;
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cleanup ( argv [ 2 ] ) ;
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return 0 ;
}