diff options
Diffstat (limited to 'ports/sysdeps/unix/sysv/linux/aarch64/nptl/vfork.S')
| -rw-r--r-- | ports/sysdeps/unix/sysv/linux/aarch64/nptl/vfork.S | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/ports/sysdeps/unix/sysv/linux/aarch64/nptl/vfork.S b/ports/sysdeps/unix/sysv/linux/aarch64/nptl/vfork.S new file mode 100644 index 0000000000..7e9342a5fe --- /dev/null +++ b/ports/sysdeps/unix/sysv/linux/aarch64/nptl/vfork.S @@ -0,0 +1,37 @@ +/* Copyright (C) 2005-2012 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, see + <http://www.gnu.org/licenses/>. */ + +#include <tcb-offsets.h> + +/* Save the PID value. */ +#define SAVE_PID \ + mrs x2, tpidr_el0; \ + sub x2, x2, #PTHREAD_SIZEOF; \ + ldr w3, [x2, #PTHREAD_PID_OFFSET]; \ + cmp w3, #0; \ + mov w0, #0x80000000; \ + csneg w0, w0, w3, eq; \ + str w0, [x2, #PTHREAD_PID_OFFSET] + +/* Restore the old PID value in the parent. */ +#define RESTORE_PID \ + cbz x0, 1f; /* If we are the parent... */ \ + str w3, [x2, #PTHREAD_PID_OFFSET]; /* restore the saved PID. */ \ +1: + +#include "../vfork.S" |