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

   1 /*      $NetBSD: brk.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: brk.S,v 1.1 2014/09/03 19:34:26 matt Exp $")
   7 #endif /* LIBC_SCCS && !lint */
   8
   9         .hidden _C_LABEL(__curbrk)
  10         .hidden _C_LABEL(__minbrk)
  11         .globl  _C_LABEL(__curbrk)
  12         .globl  _C_LABEL(__minbrk)
  13         .globl  _C_LABEL(_end)
  14
  15 #ifdef WEAK_ALIAS
  16 WEAK_ALIAS(brk, _brk)
  17 #endif
  18         .data
  19         .p2align 2
  20 _C_LABEL(__minbrk):
  21         .long   _C_LABEL(_end)
  22 _C_LABEL(__curbrk):
  23         .long   _C_LABEL(_end)
  24
  25         .text
  26 ENTRY(_brk)
  27 #ifdef __PIC__
  28         l.or    r8,r9,r0
  29         PIC_GOTSETUP(r7)
  30         l.or    r9,r8,r0
  31         l.movhi r6,gotoffhi(_C_LABEL(__minbrk))
  32         l.ori   r6,r6,gotofflo(_C_LABEL(__minbrk))
  33         l.add   r6,r6,r7
  34 #else
  35         l.movhi r6,hi(_C_LABEL(__minbrk))
  36         l.ori   r6,r6,lo(_C_LABEL(__minbrk))
  37 #endif
  38         l.lwz   r5,0(r6)                # r5 = __minbrk
  39         l.sfgts r5,r3                   # if (__minbrk <= r3)
  40         l.cmov  r5,r5,r3                # choose larger
  41         l.or    r3,r5,r0                # new break value
  42         _DOSYSCALL(break)               # assume, that r5 is kept
  43         l.bf    _C_LABEL(__cerror)
  44         l.nop
  45         l.sw    __SIZEOF_POINTER__(r6),r5
  46         l.xor   r11, r11, r11           # return 0
  47         l.jr    lr                      # return 0
  48         l.nop
  49 END(_brk)