sysdeps/unix/arm/brk.S

   1 /* Copyright (C) 1991, 92, 93, 95, 97, 98 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 #include <sysdep.h>
  20
  21 #ifndef SYS_brk
  22 #define SYS_brk 17
  23 #endif
  24
  25 .data
  26 .globl C_SYMBOL_NAME(__curbrk)
  27 C_LABEL(__curbrk)
  28 #ifdef  HAVE_GNU_LD
  29         .long C_SYMBOL_NAME(_end)
  30 #else
  31         .long C_SYMBOL_NAME(end)
  32 #endif
  33
  34 .text
  35 SYSCALL__ (brk, 1)
  36 #ifdef PIC
  37         ldr r1, 1f
  38         ldr r2, _cb_addr
  39 2:      add r1, pc, r1
  40         add r1, r1, r2
  41 #else
  42         ldr r1, _cb_addr
  43 #endif
  44         str r0, [r1]
  45         mov r0, $0
  46         DO_RET (r14)
  47 #ifdef PIC
  48 1:      .long _GLOBAL_OFFSET_TABLE_ - 2b - 8
  49 _cb_addr:
  50         .long C_SYMBOL_NAME(__curbrk)(GOTOFF)
  51 #else
  52 _cb_addr:
  53         .long C_SYMBOL_NAME(__curbrk)
  54 #endif
  55
  56 weak_alias (__brk, brk)