brk.c 1.4 KB

123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051
  1. /* brk system call for Linux/MIPS.
  2. Copyright (C) 2000, 2005, 2006 Free Software Foundation, Inc.
  3. This file is part of the GNU C Library.
  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. The GNU C Library is distributed in the hope that it will be useful,
  9. but WITHOUT ANY WARRANTY; without even the implied warranty of
  10. MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  11. Lesser General Public License for more details.
  12. You should have received a copy of the GNU Lesser General Public
  13. License along with the GNU C Library; if not, write to the Free
  14. Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  15. 02111-1307 USA. */
  16. #include <errno.h>
  17. #include <unistd.h>
  18. #include <sys/syscall.h>
  19. void *__curbrk attribute_hidden = 0;
  20. int brk (void *addr)
  21. {
  22. void *newbrk;
  23. {
  24. register long int res __asm__ ("$2");
  25. __asm__ ("move\t$4,%2\n\t"
  26. "li\t%0,%1\n\t"
  27. "syscall" /* Perform the system call. */
  28. : "=r" (res)
  29. : "I" (__NR_brk), "r" (addr)
  30. : "$4", "$7", __SYSCALL_CLOBBERS);
  31. newbrk = (void *) res;
  32. }
  33. __curbrk = newbrk;
  34. if (newbrk < addr)
  35. {
  36. __set_errno (ENOMEM);
  37. return -1;
  38. }
  39. return 0;
  40. }
  41. libc_hidden_def(brk)