/* z80_ops.jscpp: Process the next opcode
   Copyright (c) 1999-2008 Philip Kendall, Witold Filipczyk, Matthew Westcott

   $Id$

	This program 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/>.
	
	Contact details: <matthew@west.co.tt>
	Matthew Westcott, 14 Daisy Hill Drive, Adlington, Chorley, Lancs PR6 9NE UNITED KINGDOM
*/

#define HAVE_ENOUGH_MEMORY

#include "z80_macros.jscpp"

function sign_extend(v) {
  return v < 128 ? v : v-256;
}

/* Execute Z80 opcodes until the next event */
function z80_do_opcodes()
{

  while(tstates < event_next_event ) {

    var opcode;

    /* Do the instruction fetch; readbyte_internal used here to avoid
       triggering read breakpoints */
    contend( PC, 4 ); R = (R+1) & 0x7f;
    opcode = readbyte_internal( PC++ ); PC &= 0xffff;

    switch(opcode) {
#include "opcodes_base.jscpp"
    }

  }

}