lib/libc/arch/or1k/sys/sbrk.S

   1 /*      $NetBSD: sbrk.S,v 1.1 2014/09/03 19:34:26 matt Exp $    */
   2
   3 #include "SYS.h"
   4
   5 #if defined(LIBC_SCCS) && !defined(lint)
   6 __RCSID("$NetBSD: sbrk.S,v 1.1 2014/09/03 19:34:26 matt Exp $")
   7 #endif /* LIBC_SCCS && !lint */
   8
   9         .hidden _C_LABEL(__curbrk)
  10         .globl  _C_LABEL(__curbrk)
  11
  12 #ifdef WEAK_ALIAS
  13 WEAK_ALIAS(sbrk, _sbrk)
  14 #endif
  15
  16 ENTRY(_sbrk)
  17 #ifdef __PIC__
  18         l.or    r8,r9,r0
  19         PIC_GOTSETUP(r6)
  20         l.or    r9,r8,r0
  21         l.movhi r5,gotoffhi(_C_LABEL(__curbrk))
  22         l.ori   r5,r5,gotofflo(_C_LABEL(__curbrk))
  23         l.add   r5,r5,r6
  24 #else
  25         l.movhi r5,hi(_C_LABEL(__curbrk))
  26         l.ori   r5,r5,lo(_C_LABEL(__curbrk))    # r5 = old break;
  27 #endif
  28         l.lwz   r6,0(r5)                        # r6 = old break, r5 = &curbrk
  29         l.add   r3,r3,r6
  30         _DOSYSCALL(break)                       # break(new_break)
  31         l.bf    _C_LABEL(__cerror)
  32         l.nop
  33         l.sw    0(r5),r3                        # record new break
  34         l.or    r11,r6,r0                       # set return value
  35         l.jr    lr
  36         l.nop
  37 END(_sbrk)