libc/sysdeps/linux/m68k/brk.c

   1 /* consider this code LGPL - davidm */
   2 /*
   3  * Copyright (C) 2000-2006 Erik Andersen <andersen@uclibc.org>
   4  *
   5  * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
   6  */
   7
   8 #include <unistd.h>
   9 #include <sys/syscall.h>
  10 #include <errno.h>
  11
  12
  13 /* This must be initialized data because commons can't have aliases.  */
  14 void * __curbrk = 0;
  15
  16 int brk (void *addr)
  17 {
  18     void *newbrk;
  19
  20         __asm__ __volatile__ ("movel %2,%/d1\n\t"
  21                           "moveq %1,%/d0\n\t"
  22                           "trap  #0\n\t"
  23                           "movel %/d0,%0"
  24                 :"=g" (newbrk)
  25                 :"i" (__NR_brk),"g" (addr) : "%d0", "%d1");
  26
  27     __curbrk = newbrk;
  28
  29     if (newbrk < addr)
  30     {
  31         __set_errno (ENOMEM);
  32         return -1;
  33     }
  34
  35     return 0;
  36 }
  37 libc_hidden_def(brk)