/*
insn_misc.c
Copyright © 2008 William Astle

This file is part of LWASM.

LWASM is free software: you can redistribute it and/or modify it under the
terms of the GNU General Public License as published by the Free Software
Foundation, either version 3 of the License, or (at your option) any later
version.

This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
more details.

You should have received a copy of the GNU General Public License along with
this program. If not, see <http://www.gnu.org/licenses/>.

Contains code for parsing miscelaneous addressing modes
*/

#include <ctype.h>
#include <stdio.h>
#include <string.h>
#include "lwasm.h"
#include "instab.h"

extern void insn_gen_aux(asmstate_t *as, sourceline_t *cl, char **optr, int *b1, int *b2, int *b3, int *op);

// for aim, oim, eim, tim
void insn_logicmem(asmstate_t *as, sourceline_t *cl, char **optr)
{
	int rval, v1;
	int b1, b2, b3, op;
	
	if (**optr == '#')
		(*optr)++;
	
	rval = eval_expr(as, cl, optr, &v1);
	if (rval < 0)
		return;
	
	if (v1 < -128 || v1 > 255)
	{
		errorp2(ERR_OVERFLOW);
		v1 = 0;
	}
	
	if (**optr != ',' && **optr != ';')
	{
		errorp1(ERR_BADOPER);
		return;
	}
	
	(*optr)++;

	// now we have a general addressing mode - call for it
	insn_gen_aux(as, cl, optr, &b1, &b2, &b3, &op);
	
	emitop(op);
	emit(v1 & 0xff);
	if (b1 != -1)
	{
		emit(b1);
	}
	if (b2 != -1)
	{
		emit(b2);
	}
	if (b3 != -1)
	{
		emit(b3);
	}
}

void insn_bitbit(asmstate_t *as, sourceline_t *cl, char **optr)
{
	int r;
	int rval;
	int v1;
	int tv;
		
	emitop(instab[cl -> opcode].ops[0]);
	
	cl -> addrmode = OPER_BITBIT;

	r = toupper(*(*optr)++);
	if (r == 'A')
		r = 1;
	else if (r == 'B')
		r = 2;
	else if (r == 'C' && toupper(**optr) == 'C')
	{
		r = 0;
		(*optr)++;
	}
	else
	{
		errorp1(ERR_BADREG);
		return;
	}
	if (*(*optr)++ != ',')
	{
		errorp1(ERR_BADOPER);
		return;
	}
	rval = eval_expr(as, cl, optr, &v1);
	if (v1 < 0 || v1 > 7)
	{
		errorp2(ERR_OVERFLOW3);
		v1 = 0;
	}
	if (*(*optr)++ != ',')
	{
		errorp1(ERR_BADOPER);
		return;
	}
	r = (r << 6) | (v1 << 3);
	rval = eval_expr(as, cl, optr, &v1);
	if (v1 < 0 || v1 > 7)
	{
		errorp2(ERR_OVERFLOW3);
		v1 = 0;
	}
	if (*(*optr)++ != ',')
	{
		errorp1(ERR_BADOPER);
		return;
	}
	r |= v1;
	
	emit(r);
			
	// ignore base page address modifier
	if (**optr == '<')
		optr++;
			
	rval = eval_expr(as, cl, optr, &v1);
	v1 &= 0xFFFF;
	tv = v1 - ((cl -> dpval) << 8);
	if (tv > 0xFF || tv < 0)
		errorp2(ERR_OVERFLOW);
	emit(tv & 0xff);
}