libc/sysdeps/linux/h8300/brk.c

   1 /* brk on H8/300 by ysato */
   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 <errno.h>
   9 #include <unistd.h>
  10 #include <sys/syscall.h>
  11
  12 /* This must be initialized data because commons can't have aliases.  */
  13 void *__curbrk attribute_hidden = 0;
  14
  15 int brk (void *addr)
  16 {
  17     void *newbrk;
  18
  19     __asm__ ("mov.l %2,er1\n\t"
  20          "mov.l %1,er0\n\t"
  21          "trapa #0\n\t"
  22          "mov.l er0,%0"
  23          : "=r" (newbrk)
  24          : "0" (__NR_brk), "g" (addr)
  25          : "er0","er1");
  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)