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

   1 /*      $NetBSD: brk.S,v 1.5 2014/08/23 02:24:22 matt Exp $     */
   2
   3 #include "SYS.h"
   4
   5
   6         .hidden _C_LABEL(__curbrk)
   7         .globl  _C_LABEL(__curbrk)
   8         .hidden _C_LABEL(__minbrk)
   9         .globl  _C_LABEL(__minbrk)
  10         .globl  _C_LABEL(_end)
  11
  12 #ifdef WEAK_ALIAS
  13 WEAK_ALIAS(brk, _brk)
  14 #endif
  15
  16         .data
  17         .p2align 3
  18 _C_LABEL(__minbrk):
  19         .quad   _C_LABEL(_end)
  20 _C_LABEL(__curbrk):
  21         .quad   _C_LABEL(_end)
  22
  23 ENTRY(_brk)
  24         addis   %r9,%r2,_C_LABEL(__minbrk)@toc@ha
  25         ldptru  %r5,_C_LABEL(__minbrk)@toc@l(%r9)
  26         cmpptrl %r5,%r3                 # if (__minbrk <= r3)
  27 #ifdef __PPC_ISEL__
  28         iselgt  %r3,%r5,%r3
  29 #else
  30         bgt     0f
  31         mr      %r5,%r3                 # r5 = r3
  32 0:
  33         mr      %r3,%r5                 # new break value
  34 #endif
  35         _DOSYSCALL(break)               # assume that r5 is preserved
  36         bso     1f
  37         stptr   %r5,__SIZEOF_POINTER__(%r9)
  38         blr                             # return 0
  39
  40 1:
  41         BRANCH_TO_CERROR()
  42 END(_brk)