ports/sysdeps/unix/sysv/linux/aarch64/nptl/pt-vfork.S

   1 /* Copyright (C) 2009-2014 Free Software Foundation, Inc.
   2
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public License as
   7    published by the Free Software Foundation; either version 2.1 of the
   8    License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <tcb-offsets.h>
  20
  21 /* Save the PID value.  */
  22 #define SAVE_PID                                                        \
  23         mrs     x2, tpidr_el0;                                          \
  24         sub     x2, x2, #PTHREAD_SIZEOF;                                \
  25         ldr     w3, [x2, #PTHREAD_PID_OFFSET];                          \
  26         neg     w0, w3;                                                 \
  27         str     w0, [x2, #PTHREAD_PID_OFFSET]
  28
  29 /* Restore the old PID value in the parent.  */
  30 #define RESTORE_PID                                                     \
  31         cbz     x0, 1f;                                                 \
  32         str     w3, [x2, #PTHREAD_PID_OFFSET];                          \
  33 1:
  34
  35 #include "../vfork.S"