ports/sysdeps/unix/sysv/linux/mips/nptl/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 <tls.h>
  19
  20 /* Save the PID value.  */
  21 #define SAVE_PID \
  22         READ_THREAD_POINTER(v1);        /* Get the thread pointer.  */  \
  23         lw      a2, PID_OFFSET(v1);     /* Load the saved PID.  */      \
  24         subu    a2, $0, a2;             /* Negate it.  */               \
  25         bnez    a2, 1f;                 /* If it was zero... */         \
  26         lui     a2, 0x8000;             /* use 0x80000000 instead.  */  \
  27 1:      sw      a2, PID_OFFSET(v1);     /* Store the temporary PID.  */
  28
  29 /* Restore the old PID value in the parent.  */
  30 #define RESTORE_PID \
  31         beqz    v0, 1f;                 /* If we are the parent... */   \
  32         READ_THREAD_POINTER(v1);        /* Get the thread pointer.  */  \
  33         lw      a2, PID_OFFSET(v1);     /* Load the saved PID.  */      \
  34         subu    a2, $0, a2;             /* Re-negate it.  */            \
  35         lui     a0, 0x8000;             /* Load 0x80000000... */        \
  36         bne     a2, a0, 2f;             /* ... compare against it... */ \
  37         li      a2, 0;                  /* ... use 0 instead.  */       \
  38 2:      sw      a2, PID_OFFSET(v1);     /* Restore the PID.  */         \
  39 1:
  40
  41 #include <sysdeps/unix/sysv/linux/mips/vfork.S>