lib/libc/arch/powerpc64/sys/sbrk.S

   1 /*      $NetBSD: sbrk.S,v 1.2 2006/07/05 18:28:43 ross Exp $    */
   2
   3 #include "SYS.h"
   4
   5         .globl  _C_LABEL(__curbrk)
   6         .globl  _C_LABEL(_end)
   7
   8 #ifdef WEAK_ALIAS
   9 WEAK_ALIAS(sbrk, _sbrk)
  10 #endif
  11
  12
  13         .data
  14 _C_LABEL(__curbrk):
  15         .long   _C_LABEL(_end)
  16         .text
  17
  18         .macro  LdAddr  r,sym
  19         .pushsection    ".toc","aw"
  20 100:    .tc \sym[TC],\sym
  21         .popsection
  22         ld      \r,100b@toc(2)
  23         .endm
  24
  25 ENTRY(_sbrk)
  26         ldAddr  %r6,__curbrk
  27         add     %r3,%r3,%r6
  28         mr      %r7,%r3                         # r7 = new break
  29         li      %r0,SYS_break
  30         sc                                      # break(new_break)
  31         bso     1f
  32         mr      %r3,%r6                         # set return value
  33         LdAddr  %r6,__curbrk
  34         std     %r7,0(%r6)
  35         blr
  36 1:
  37         b       PIC_PLT(_C_LABEL(__cerror))