2.11BSD#431 - /usr/src/lib/libc/pdp/gen/remque.s

   1: /*
   2:  * Copyright (c) 1987 Regents of the University of California.
   3:  * All rights reserved.  The Berkeley software License Agreement
   4:  * specifies the terms and conditions for redistribution.
   5:  */
   6: 
   7: #ifdef LIBC_SCCS
   8:         <@(#)remque.s	1.2 (Berkeley) 1/20/87\0>
   9:         .even
  10: #endif LIBC_SCCS
  11: 
  12: /*
  13:  * struct qelem
  14:  * {
  15:  *	struct qelem	*q_forw;
  16:  *	struct qelem	*q_back;
  17:  *	char		q_data[];
  18:  * }
  19:  *
  20:  * remque (elem)
  21:  *	struct qelem  *elem
  22:  *
  23:  * Remove elem from queue.
  24:  */
  25: #include "DEFS.h"
  26: 
  27: ENTRY(remque)
  28:         mov     2(sp),r0        / r0 = elem
  29:         mov     (r0),r1         / r1 = elem->q_forw
  30: 
  31:         mov     2(r0),r0        / r0 = elem->q_back
  32:         mov     r1,(r0)         / elem->q_back->q_forw = elem->forw
  33:         mov     r0,2(r1)        / elem->q_forw->q_back = elem->back
  34: 
  35:         rts     pc

Defined functions