summaryrefslogtreecommitdiff
path: root/libc/sysdeps/linux/aarch64/vfork.S
diff options
context:
space:
mode:
authorWaldemar Brodkorb <wbx@uclibc-ng.org>2016-10-04 06:51:35 +0200
committerWaldemar Brodkorb <wbx@openadk.org>2017-02-01 17:48:38 +0100
commitdba942c80dc2cfa5768a856fff98e22a755fdd27 (patch)
tree371e775cb6dfec085945f6834aeb9d3b6de36fbe /libc/sysdeps/linux/aarch64/vfork.S
parent9b457baf8d46329f7d7ee2aa084022bb0df88551 (diff)
add experimental aarch64 support
Ported over from GNU C Library and runtime tested in Qemu.
Diffstat (limited to 'libc/sysdeps/linux/aarch64/vfork.S')
-rw-r--r--libc/sysdeps/linux/aarch64/vfork.S37
1 files changed, 37 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/aarch64/vfork.S b/libc/sysdeps/linux/aarch64/vfork.S
new file mode 100644
index 000000000..9a8fd469a
--- /dev/null
+++ b/libc/sysdeps/linux/aarch64/vfork.S
@@ -0,0 +1,37 @@
+/* Copyright (C) 1999-2017 Free Software Foundation, Inc.
+
+ 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 <sysdep.h>
+#define _ERRNO_H 1
+#include <bits/errno.h>
+
+/* Clone the calling process, but without copying the whole address space.
+ The calling process is suspended until the new process exits or is
+ replaced by a call to `execve'. Return -1 for errors, 0 to the new process,
+ and the process ID of the new process to the old process. */
+
+ENTRY (vfork)
+
+ mov x0, #0x4111 /* CLONE_VM | CLONE_VFORK | SIGCHLD */
+ mov x1, sp
+ DO_CALL (clone, 2)
+
+ cmn x0, #4095
+ b.cs .Lsyscall_error
+ RET
+
+PSEUDO_END (vfork)
+libc_hidden_def (vfork)