/*
* Executes a given instruction, or errors out
* ins - instruction to run
*/
void
execute (unsigned short int ins)
{
/* seperate instruction into parts */
short int a0 = (ins >> 12) % 16;
short int a1 = (ins >> 8) % 16;
short int a2 = (ins >> 4) % 16;
short int a3 = (ins >> 0) % 16;
/* Run associated instruction */
switch(a0) {
case 0x0:
_add (a1, a2, a3);
break;
case 0x1:
_sub (a1, a2, a3);
break;
case 0x2:
_mul (a1, a2, a3);
break;
case 0x3:
_div (a1, a2, a3);
break;
case 0x6:
_beq (a1, a2, a3);
break;
case 0x7:
_bgt (a1, a2, a3);
break;
case 0x8:
_ld (a1, a2, a3);
break;
case 0x9:
_st (a1, a2, a3);
break;
case 0xa:
_lc (a1, a3);
break;
case 0xb:
_jmp (a1, a3);
break;
case 0xc:
_inc (a1, a3);
break;
case 0xf:
_sys (a1, a3);
break;
default:
printf ("Error: invalid opcode %#x.\n", a0);
sys_dump (0x0);
sys_halt (0x0);
}
}
void VMDriver::execute(){
if( this->m_state == STATE_IDLE ){
printf( "Error: state is idle. \n");
return;
}
assert( this->currentAssembly() );
while( this->isActive() ){
if( this->isBreak() ){
break;
}
unsigned char content = this->getByte( m_funcAddr , m_pc );
m_pc++;
switch( content ){
case EMnemonic::MovPtr :
_mov_ptr();
break;
case EMnemonic::Mov :
_mov();
break;
case EMnemonic::Add :
_add();
break;
case EMnemonic::Sub :
_sub();
break;
case EMnemonic::Mul :
_mul();
break;
case EMnemonic::Div :
_div();
break;
case EMnemonic::Rem :
_rem();
break;
case EMnemonic::Inc :
_inc();
break;
case EMnemonic::Dec :
_dec();
break;
case EMnemonic::Push :
_push();
break;
case EMnemonic::PushPtr :
_push_ptr();
break;
case EMnemonic::Pop :
_pop();
break;
case EMnemonic::Call :
_call();
break;
case EMnemonic::ST :
_st();
break;
case EMnemonic::LD :
_ld();
break;
case EMnemonic::EndFunc :
_endFunc();
break;
case EMnemonic::CmpGeq :
case EMnemonic::CmpG :
case EMnemonic::CmpLeq :
case EMnemonic::CmpL :
case EMnemonic::CmpEq :
case EMnemonic::CmpNEq :
_cmp( content );
break;
case EMnemonic::Not :
_not();
break;
case EMnemonic::Minus :
_minus();
break;
case EMnemonic::LogOr :
case EMnemonic::LogAnd :
_log( content );
break;
case EMnemonic::Jmp :
_jmp();
break;
case EMnemonic::JumpZero :
_jumpzero();
break;
case EMnemonic::JumpNotZero :
_jumpnotzero();
break;
case EMnemonic::RET :
_ret();
break;
}
}
}