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

   1 /*      $NetBSD: sbrk.S,v 1.12 2013/09/12 15:36:15 joerg Exp $  */
   2
   3 #include "SYS.h"
   4
   5 #if defined(LIBC_SCCS) && !defined(lint)
   6 __RCSID("$NetBSD: sbrk.S,v 1.12 2013/09/12 15:36:15 joerg Exp $")
   7 #endif /* LIBC_SCCS && !lint */
   8
   9         .globl  _C_LABEL(__curbrk)
  10         .globl  _C_LABEL(_end)
  11
  12 #ifdef WEAK_ALIAS
  13 WEAK_ALIAS(sbrk, _sbrk)
  14 #endif
  15
  16         .data
  17 _C_LABEL(__curbrk):
  18         .long   _C_LABEL(_end)
  19         .text
  20
  21 ENTRY(_sbrk)
  22 #ifdef __PIC__
  23         mflr    %r10
  24         PIC_GOTSETUP(%r5)
  25         mtlr    %r10
  26         lwz     %r5,_C_LABEL(__curbrk)@got(%r5)
  27         lwz     %r6,0(%r5)
  28 #else
  29         lis     %r5,_C_LABEL(__curbrk)@ha
  30         lwzu    %r6,_C_LABEL(__curbrk)@l(%r5)   # r6 = old break, r5 = &curbrk
  31 #endif
  32         add     %r3,%r3,%r6
  33         mr      %r7,%r3                         # r7 = new break
  34         _DOSYSCALL(break)                       # break(new_break)
  35         bso     1f
  36         mr      %r3,%r6                         # set return value
  37         stw     %r7,0(%r5)                      # record new break
  38         blr
  39 1:
  40         b       _C_LABEL(__cerror)
  41 END(_sbrk)