public function assemble()
{
#print 'jmp assemble'."\n";
$dst = $this->dst;
$isStrDst = is_string($dst);
if ($dst instanceof Instruction) {
#\Doctrine\Common\Util\Debug::dump($dst, 1);
#\Doctrine\Common\Util\Debug::dump($this, 1);
#print "\t".'dst offset: '.$dst->getOffset()."\n";
#print "\t".'this offset: '.$this->getOffset()."\n";
$offset = $dst->getOffset() - $this->getOffset();
#print "\t".'diff: '.$offset."\n";
$orgOffset = $offset;
$offset -= 2;
if ($orgOffset < 0) {
if ($offset < -0x80) {
$offset -= 3;
}
#print "\t".'<- '.$offset."\n";
}
$jmp = new Jmp($offset);
$this->setOpcode($jmp->assemble());
$this->setLen($jmp->getLen());
} elseif (is_numeric($dst)) {
#print "\t".'is numeric: '.$dst.' '.dechex($dst)."\n";
$base = 0;
#$absDst = abs($dst);
if ($dst >= -0x80 && $dst <= 0x7f) {
$base = 0xeb00;
$dst &= 0xff;
$dst |= $base;
#print "\t".'short label: '.dechex($dst)."\n";
} elseif ($dst >= -0x80000000 && $dst <= 0x7fffffff) {
$base = 0xe900000000;
$dst &= 0xffffffff;
$dst = Num::be2le($dst, 4);
$dst |= $base;
#print "\t".'long label: '.dechex($dst)."\n";
}
if ($base) {
$opcode = dechex($dst);
$opcodeLen = strlen($opcode);
$this->setOpcode(pack('H*', $opcode));
$this->setLen($opcodeLen / 2);
}
} elseif ($isStrDst) {
$strLenDst = strlen($dst);
if ($strLenDst == 2) {
$jmp = new X86Jmp($dst);
$this->setOpcode(pack('H*', '66') . $jmp->assemble());
$this->setLen($jmp->getLen() + 1);
} elseif ($strLenDst == 3) {
$base = 0xffe0;
switch ($dst[1]) {
/*case 'a':
$base += 0;
break;*/
case 'c':
$base++;
break;
case 'd':
$base += 2;
break;
case 'b':
$base += 3;
break;
}
$opcode = dechex($base);
$opcodeLen = strlen($opcode);
$this->setOpcode(pack('H*', $opcode));
$this->setLen($opcodeLen / 2);
}
}
return $this->getOpcode();
}
public function test8086Self()
{
$jmp1 = new X8086Jmp(0);
$jmp1->dst = $jmp1;
$jmp1->setOffset(10);
$opcode = unpack('H*', $jmp1->assemble());
$opcode = $opcode[1];
$this->assertEquals('ebfe', $opcode);
}