diff options
Diffstat (limited to 'libpthread/nptl/sysdeps/unix/sysv/linux/x86_64/vfork.S')
| -rw-r--r-- | libpthread/nptl/sysdeps/unix/sysv/linux/x86_64/vfork.S | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/libpthread/nptl/sysdeps/unix/sysv/linux/x86_64/vfork.S b/libpthread/nptl/sysdeps/unix/sysv/linux/x86_64/vfork.S new file mode 100644 index 000000000..9a9912ca8 --- /dev/null +++ b/libpthread/nptl/sysdeps/unix/sysv/linux/x86_64/vfork.S @@ -0,0 +1,43 @@ +/* Copyright (C) 2004 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +/* We want an #include_next, but we are the main source file. + So, #include ourselves and in that incarnation we can use #include_next. */ +#ifndef INCLUDED_SELF +# define INCLUDED_SELF +# include <vfork.S> +#else + +# include <tcb-offsets.h> + +# define SAVE_PID \ + movl %fs:PID, %esi; \ + movl $0x80000000, %ecx; \ + movl %esi, %edx; \ + negl %edx; \ + cmove %ecx, %edx; \ + movl %edx, %fs:PID + +# define RESTORE_PID \ + testq %rax, %rax; \ + je 1f; \ + movl %esi, %fs:PID; \ +1: + +# include_next <vfork.S> +#endif |