libc/sysdeps/linux/metag/brk.c

   1 /*
   2  * Copyright (C) 2013 Imagination Technologies Ltd.
   3  *
   4  * Licensed under the LGPL v2.1 or later, see the file COPYING.LIB in this tarball.
   5  */
   6
   7 #include <errno.h>
   8 #include <unistd.h>
   9 #include <sys/syscall.h>
  10
  11 libc_hidden_proto(brk)
  12
  13 /* This must be initialized data because commons can't have aliases.  */
  14 void * __curbrk attribute_hidden = 0;
  15
  16 int brk (void *addr)
  17 {
  18     void *newbrk;
  19
  20     __asm__ __volatile__ ("MOV D1Re0,%2\n\t"
  21                           "MOV D1Ar1,%1\n\t"
  22                           "SWITCH #0x440001\n\t"
  23                           "MOV %0,D0Re0"
  24                           : "=r" (newbrk)
  25                           : "r" (addr), "K" (__NR_brk)
  26                           : "D0Re0", "D1Re0", "D1Ar1");
  27
  28     __curbrk = newbrk;
  29
  30     if (newbrk < addr)
  31     {
  32         __set_errno (ENOMEM);
  33         return -1;
  34     }
  35
  36     return 0;
  37 }
  38 libc_hidden_def(brk)