4454:  0412           push  r4
4456:  0441           mov   sp, r4
4458:  2453           incd  r4
445a:  2183           decd  sp
445c:  c443 fcff      mov.b #0x0, -0x4(r4)
4460:  3e40 fcff      mov   #0xfffc, r14
4464:  0e54           add   r4, r14
4466:  0e12           push  r14
4468:  0f12           push  r15
446a:  3012 7d00      push  #0x7d
446e:  b012 7a45      call  #0x457a <INT>
4472:  5f44 fcff      mov.b -0x4(r4), r15
4476:  8f11           sxt   r15
4478:  3152           add   #0x8, sp
447a:  3441           pop   r4
447c:  3041           ret