353 lines
6.8 KiB
C
353 lines
6.8 KiB
C
#include <string.h>
|
|
#include <ctype.h>
|
|
#include <stdio.h>
|
|
#include "as.h"
|
|
#include "arg_type.h"
|
|
|
|
|
|
process_label() {}
|
|
|
|
|
|
process_mnemonic( m)
|
|
char *m;
|
|
{
|
|
for ( ; *m != '\0'; m++)
|
|
if ( *m == '.')
|
|
*m = '_';
|
|
}
|
|
|
|
|
|
process_operand( str, op)
|
|
register char *str;
|
|
register struct t_operand *op;
|
|
{
|
|
char *glob_lbl();
|
|
|
|
op->type = 0;
|
|
|
|
switch ( *str) {
|
|
case '#' : op->type = IS_IMMEDIATE;
|
|
op->expr = str+1;
|
|
|
|
if ( *(op->expr) != '$') { /* #1 */
|
|
op->val = atoi( str+1);
|
|
if ( 1 <= op->val && op->val <= 8 ) {
|
|
op->type = IS_QUICK;
|
|
op->lbl = NULL;
|
|
}
|
|
}
|
|
else
|
|
if ( arg_type( str+1) == STRING) { /* #$1+$2 */
|
|
op->lbl = op->expr;
|
|
*(op->lbl+2) = '\0';
|
|
op->expr = op->lbl+3;
|
|
}
|
|
else /* #$1 */
|
|
op->lbl = NULL;
|
|
break;
|
|
|
|
case '(' : if ( index( str+1, ',') == NULL)
|
|
if ( is_reg( str+1)) {
|
|
op->reg = reg_val( str+1);
|
|
|
|
if ( *(str+4) == '+') /* (sp)+ */
|
|
op->type = IS_INCR;
|
|
else /* (a0) */
|
|
op->type = IS_IND_REG;
|
|
}
|
|
else {
|
|
op->type = IS_IND_MEM;
|
|
op->expr = str+1;
|
|
for ( str++; *++str != ')';)
|
|
;
|
|
*str = '\0';
|
|
|
|
if ( *(op->expr) == '$')
|
|
if ( arg_type( op->expr) == STRING) {
|
|
/* ($1+$2) */
|
|
op->lbl = op->expr;
|
|
if ( strlen( op->lbl) == 2)
|
|
op->expr = "0";
|
|
else {
|
|
*(op->lbl+2) = '\0';
|
|
op->expr = op->lbl+3;
|
|
}
|
|
}
|
|
else /* ($1) */
|
|
op->lbl = NULL;
|
|
else if ( isdigit( *(op->expr))) /* (1) */
|
|
op->lbl = NULL;
|
|
else { /* (.trppc) */
|
|
op->lbl = glob_lbl( op->expr);
|
|
op->expr = "0";
|
|
}
|
|
}
|
|
else
|
|
if ( *(str+1) == '[') {
|
|
op->type = IS_IND_IND;
|
|
op->expr = str+2;
|
|
for ( str += 2; *++str != ',';)
|
|
;
|
|
*str++ = '\0';
|
|
for ( ; *str == ' '; str++)
|
|
;
|
|
op->reg = reg_val( str);
|
|
|
|
for ( ; *str++ != ']';)
|
|
;
|
|
if ( *str == ')') /* ([$1, a6]) */
|
|
op->expr2 = 0;
|
|
else { /* ([8,a6],8) */
|
|
for ( ; *str++ != ',';)
|
|
;
|
|
for ( ; *str == ' '; str++)
|
|
;
|
|
op->expr2 = atoi( str);
|
|
}
|
|
}
|
|
else {
|
|
op->expr = str+1;
|
|
for ( str++; *++str != ',';)
|
|
;
|
|
*str++ = '\0';
|
|
for ( ; *str == ' '; str++)
|
|
;
|
|
op->reg = reg_val( str);
|
|
if ( *(str+2) == ')') /* (4, a0) */
|
|
op->type = IS_IND_REG_DISPL;
|
|
else { /* (0, sp, d0.l*1) */
|
|
op->type = IS_3_OPS;
|
|
for ( str++; *++str != ',';)
|
|
;
|
|
for ( ; *str == ' '; str++)
|
|
;
|
|
op->reg2 = reg_val( str);
|
|
|
|
for ( ; *str++ != '*';)
|
|
;
|
|
op->scale = atoi( str);
|
|
}
|
|
}
|
|
break;
|
|
|
|
case '-' : op->type = IS_DECR; /* -(sp) */
|
|
op->reg = reg_val( str+2);
|
|
break;
|
|
|
|
case '$' : op->type = IS_GLOB_LBL; /* $1 */
|
|
op->lbl = str;
|
|
op->expr ="0";
|
|
break;
|
|
|
|
default : if ( is_reg( str)) {
|
|
op->reg = reg_val( str);
|
|
if ( *(str+2) == ':') { /* d2:d1 */
|
|
op->type = IS_REG_PAIR;
|
|
op->reg2 = reg_val( str+3);
|
|
}
|
|
else /* a6 */
|
|
op->type = ( *str == 'd' ? IS_D_REG : IS_A_REG);
|
|
}
|
|
else if ( isdigit( *str)) { /* 1f */
|
|
op->type = IS_LOC_LBL;
|
|
op->lbl = str;
|
|
op->expr = "0";
|
|
*(str+1) ='\0';
|
|
}
|
|
else { /* .strhp */
|
|
op->type = IS_GLOB_LBL;
|
|
op->lbl = glob_lbl( str);
|
|
*(str+1) ='\0';
|
|
op->expr = "0";
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
int reg_val( reg)
|
|
char *reg;
|
|
{
|
|
return( *reg == 's' ? 7 : atoi( reg+1));
|
|
}
|
|
|
|
int is_reg( str)
|
|
register char *str;
|
|
{
|
|
switch ( *str) {
|
|
case 'a' :
|
|
case 'd' : return( isdigit( *(str+1)));
|
|
|
|
case 's' : return( *(str+1) == 'p');
|
|
|
|
default : return( 0);
|
|
}
|
|
}
|
|
|
|
|
|
char *glob_lbl( lbl)
|
|
char *lbl;
|
|
{
|
|
char *gl, *Malloc();
|
|
|
|
gl = Malloc( strlen( lbl) + 3);
|
|
sprintf( gl, "\"%s\"", lbl);
|
|
return( gl);
|
|
}
|
|
|
|
|
|
/******************************************************************************/
|
|
|
|
|
|
int mode_reg( eaddr)
|
|
register struct t_operand *eaddr;
|
|
{
|
|
switch ( eaddr->type) {
|
|
case IS_A_REG : return( 0x08 | eaddr->reg);
|
|
|
|
case IS_D_REG : return( 0x00 | eaddr->reg);
|
|
|
|
case IS_IND_REG : return( 0x10 | eaddr->reg);
|
|
|
|
case IS_INCR : return( 0x18 | eaddr->reg);
|
|
|
|
case IS_DECR : return( 0x20 | eaddr->reg);
|
|
|
|
case IS_IND_MEM : return( 0x39);
|
|
|
|
case IS_IND_IND : return( 0x30 | eaddr->reg);
|
|
|
|
case IS_IND_REG_DISPL : return( 0x28 | eaddr->reg);
|
|
|
|
case IS_GLOB_LBL : return( 0x39);
|
|
|
|
case IS_3_OPS : if ( isdigit( *(eaddr->expr)) &&
|
|
atoi( eaddr->expr) < 128)
|
|
return( 0x30 | eaddr->reg);
|
|
else
|
|
fprintf( stderr, "FOUT in IS_3_OPS\n");
|
|
break;
|
|
|
|
case IS_QUICK :
|
|
case IS_IMMEDIATE : return( 0x3c);
|
|
|
|
default : fprintf( stderr,
|
|
"mode_reg(), verkeerde operand %d\n",
|
|
eaddr->type);
|
|
abort();
|
|
break;
|
|
}
|
|
}
|
|
|
|
|
|
code_extension( eaddr)
|
|
register struct t_operand *eaddr;
|
|
{
|
|
|
|
switch ( eaddr->type) {
|
|
case IS_IND_MEM : if ( eaddr->lbl == NULL)
|
|
@text4( %$( eaddr->expr));
|
|
else
|
|
@reloc4( %$( eaddr->lbl),
|
|
%$( eaddr->expr),
|
|
ABSOLUTE);
|
|
break;
|
|
|
|
case IS_IND_IND : if ( eaddr->expr2 == 0) {
|
|
@text2( 0x161);
|
|
@text2( %$(eaddr->expr));
|
|
}
|
|
else {
|
|
@text2( 0x162);
|
|
@text2( %$(eaddr->expr));
|
|
@text2( %d(eaddr->expr2));
|
|
}
|
|
break;
|
|
|
|
case IS_IND_REG_DISPL : @text2( %$( eaddr->expr));
|
|
break;
|
|
|
|
case IS_GLOB_LBL : @reloc4( %$(eaddr->lbl),
|
|
%$(eaddr->expr),
|
|
ABSOLUTE);
|
|
break;
|
|
|
|
case IS_3_OPS : if ( isdigit( *(eaddr->expr)) &&
|
|
atoi( eaddr->expr) < 128) {
|
|
|
|
@text2( %d( 0x0800 |
|
|
( eaddr->reg2 << 12) |
|
|
( two_log( eaddr->scale)<<9) |
|
|
atoi( eaddr->expr)));
|
|
}
|
|
else
|
|
fprintf( stderr, "FOUT in IS_3_OPS\n");
|
|
break;
|
|
|
|
case IS_QUICK :
|
|
case IS_IMMEDIATE : if ( eaddr->lbl != NULL)
|
|
@reloc4( %$(eaddr->lbl),
|
|
%$(eaddr->expr),
|
|
ABSOLUTE);
|
|
else
|
|
@text4( %$(eaddr->expr));
|
|
}
|
|
}
|
|
|
|
|
|
int reg_mode( eaddr)
|
|
struct t_operand *eaddr;
|
|
{
|
|
int mr;
|
|
|
|
mr = mode_reg( eaddr);
|
|
return( ((mr & 0x7) << 3) | ((mr & 0x38) >> 3));
|
|
}
|
|
|
|
|
|
code_opcode( opcode, field1, field2, eaddr)
|
|
int opcode, field1, field2;
|
|
struct t_operand *eaddr;
|
|
{
|
|
@text2( %d(((opcode & 0xf) << 12) | ((field1 & 0x7) << 9) |
|
|
((field2 & 0x7) << 6) | (mode_reg(eaddr) & 0x3f)));
|
|
}
|
|
|
|
|
|
code_instr( opcode, field1, field2, eaddr)
|
|
int opcode, field1, field2;
|
|
struct t_operand *eaddr;
|
|
{
|
|
code_opcode( opcode, field1, field2, eaddr);
|
|
code_extension( eaddr);
|
|
}
|
|
|
|
|
|
code_move( size, src, dst)
|
|
int size;
|
|
struct t_operand *src, *dst;
|
|
{
|
|
@text2( %d( ((size & 0x3) << 12) | ((reg_mode( dst) & 0x3f) << 6) |
|
|
(mode_reg( src) & 0x3f)));
|
|
code_extension( src);
|
|
code_extension( dst);
|
|
}
|
|
|
|
|
|
code_dist4( dst)
|
|
struct t_operand *dst;
|
|
{
|
|
@reloc4( %$(dst->lbl), %$(dst->expr) + 4, PC_REL);
|
|
}
|
|
|
|
|
|
int two_log( nr)
|
|
register int nr;
|
|
{
|
|
register int log;
|
|
|
|
for ( log = 0; nr >= 2; nr >>= 1)
|
|
log++;
|
|
|
|
return( log);
|
|
}
|