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

   1 /* Copyright (C) 2005-2014 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   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
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library.  If not, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #include <tcb-offsets.h>
  19
  20 /* Save the PID value.  */
  21 #define SAVE_PID \
  22         GET_TLS (r2);                                                   \
  23         NEGOFF_ADJ_BASE2 (r2, r0, PID_OFFSET); /* Save the TLS addr in r2. */ \
  24         ldr     r3, NEGOFF_OFF1 (r2, PID_OFFSET); /* Load the saved PID.  */  \
  25         rsb     r0, r3, #0;             /* Negate it.  */                    \
  26         str     r0, NEGOFF_OFF1 (r2, PID_OFFSET); /* Store the temp PID.  */
  27
  28 /* Restore the old PID value in the parent.  */
  29 #define RESTORE_PID \
  30         cmp     r0, #0;                 /* If we are the parent... */   \
  31         it      ne;                                                     \
  32         strne   r3, NEGOFF_OFF1 (r2, PID_OFFSET); /* restore the saved PID.  */
  33
  34 #include "../vfork.S"