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

   1 /*      $NetBSD: brk.S,v 1.2 2006/07/06 17:05:04 ross Exp $     */
   2
   3 #include "SYS.h"
   4
   5         .globl  _C_LABEL(__curbrk)
   6         .globl  _C_LABEL(__minbrk)
   7         .globl  _C_LABEL(_end)
   8
   9 #ifdef WEAK_ALIAS
  10 WEAK_ALIAS(brk, _brk)
  11 #endif
  12
  13         .macro  LdAddr  r,sym
  14         .pushsection    ".toc","aw"
  15 100:    .tc \sym[TC],\sym
  16         .popsection
  17         ld      \r,100b@toc(2)
  18         .endm
  19
  20         .data
  21 _C_LABEL(__minbrk):
  22         .long   _C_LABEL(_end)
  23         .text
  24
  25 ENTRY(_brk)
  26         LdAddr  %r5,_end
  27         cmpld   %r5,%r3                 # if (&_end <= r3)
  28         bgt     0f
  29         mr      %r5,%r3                 # r5 = r3
  30 0:
  31         mr      %r3,%r5                 # new break value
  32         li      %r0,SYS_break
  33         sc                              # assume, that r5 is kept
  34         bso     1f
  35         LdAddr  %r6,__curbrk
  36         std     %r5,0(%r6)
  37         blr                             # return 0
  38
  39 1:
  40         b       .__cerror