Esempio n. 1
0
 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();
 }
Esempio n. 2
0
 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);
 }