add experimental aarch64 support

Ported over from GNU C Library and runtime tested in Qemu.

35 files changed, 1880 insertions, 75 deletions

diff --git a/libc/sysdeps/linux/aarch64/Makefile b/libc/sysdeps/linux/aarch64/Makefile
new file mode 100644
index 000000000..86a32a613
--- /dev/null
+++ b/libc/sysdeps/linux/aarch64/Makefile
@@ -0,0 +1,9 @@
+# Makefile for uClibc-ng
+# Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+
+top_srcdir=../../../../
+top_builddir=../../../../
+all: objs
+include $(top_builddir)Rules.mak
+include Makefile.arch
+include $(top_srcdir)Makerules
diff --git a/libc/sysdeps/linux/aarch64/Makefile.arch b/libc/sysdeps/linux/aarch64/Makefile.arch
new file mode 100644
index 000000000..b38f760a8
--- /dev/null
+++ b/libc/sysdeps/linux/aarch64/Makefile.arch
@@ -0,0 +1,5 @@
+# Makefile for uClibc-ng
+# Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+
+CSRC-y := __syscall_error.c
+SSRC-y := clone.S setjmp.S syscall.S __longjmp.S bsd-setjmp.S bsd-_setjmp.S vfork.S
diff --git a/libc/sysdeps/linux/aarch64/__longjmp.S b/libc/sysdeps/linux/aarch64/__longjmp.S
new file mode 100644
index 000000000..e4d11b165
--- /dev/null
+++ b/libc/sysdeps/linux/aarch64/__longjmp.S
@@ -0,0 +1,107 @@
+/* Copyright (C) 1997-2016 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 <sysdep.h>
+#include <jmpbuf-offsets.h>
+
+/* __longjmp(jmpbuf, val) */
+
+ENTRY (__longjmp)
+	cfi_def_cfa(x0, 0)
+	cfi_offset(x19, JB_X19<<3)
+	cfi_offset(x20, JB_X20<<3)
+	cfi_offset(x21, JB_X21<<3)
+	cfi_offset(x22, JB_X22<<3)
+	cfi_offset(x23, JB_X23<<3)
+	cfi_offset(x24, JB_X24<<3)
+	cfi_offset(x25, JB_X25<<3)
+	cfi_offset(x26, JB_X26<<3)
+	cfi_offset(x27, JB_X27<<3)
+	cfi_offset(x28, JB_X28<<3)
+	cfi_offset(x29, JB_X29<<3)
+	cfi_offset(x30, JB_LR<<3)
+
+	cfi_offset( d8, JB_D8<<3)
+	cfi_offset( d9, JB_D9<<3)
+	cfi_offset(d10, JB_D10<<3)
+	cfi_offset(d11, JB_D11<<3)
+	cfi_offset(d12, JB_D12<<3)
+	cfi_offset(d13, JB_D13<<3)
+	cfi_offset(d14, JB_D14<<3)
+	cfi_offset(d15, JB_D15<<3)
+
+	ldp	x19, x20, [x0, #JB_X19<<3]
+	ldp	x21, x22, [x0, #JB_X21<<3]
+	ldp	x23, x24, [x0, #JB_X23<<3]
+	ldp	x25, x26, [x0, #JB_X25<<3]
+	ldp	x27, x28, [x0, #JB_X27<<3]
+	ldp	x29, x30, [x0, #JB_X29<<3]
+
+	/* longjmp probe takes 3 arguments, address of jump buffer as
+	   first argument (8@x0), return value as second argument (-4@x1),
+	   and target address (8@x30), respectively.  */
+	//LIBC_PROBE (longjmp, 3, 8@x0, -4@x1, 8@x30)
+	ldp	 d8,  d9, [x0, #JB_D8<<3]
+	ldp	d10, d11, [x0, #JB_D10<<3]
+	ldp	d12, d13, [x0, #JB_D12<<3]
+	ldp	d14, d15, [x0, #JB_D14<<3]
+
+        /* Originally this was implemented with a series of
+	   .cfi_restore() directives.
+
+           The theory was that cfi_restore should revert to previous
+           frame value is the same as the current value.  In practice
+           this doesn't work, even after cfi_restore() gdb continues
+           to try to recover a previous frame value offset from x0,
+           which gets stuffed after a few more instructions.  The
+           cfi_same_value() mechanism appears to work fine.  */
+
+	cfi_same_value(x19)
+	cfi_same_value(x20)
+	cfi_same_value(x21)
+	cfi_same_value(x22)
+	cfi_same_value(x23)
+	cfi_same_value(x24)
+	cfi_same_value(x25)
+	cfi_same_value(x26)
+	cfi_same_value(x27)
+	cfi_same_value(x28)
+	cfi_same_value(x29)
+	cfi_same_value(x30)
+	cfi_same_value(d8)
+	cfi_same_value(d9)
+	cfi_same_value(d10)
+	cfi_same_value(d11)
+	cfi_same_value(d12)
+	cfi_same_value(d13)
+	cfi_same_value(d14)
+	cfi_same_value(d15)
+	ldr	x5, [x0, #JB_SP<<3]
+	mov	sp, x5
+
+	/* longjmp_target probe takes 3 arguments, address of jump buffer
+	   as first argument (8@x0), return value as second argument (-4@x1),
+	   and target address (8@x30), respectively.  */
+	//LIBC_PROBE (longjmp_target, 3, 8@x0, -4@x1, 8@x30)
+	cmp	x1, #0
+	mov	x0, #1
+	csel	x0, x1, x0, ne
+	/* Use br instead of ret because ret is guaranteed to mispredict */
+	br	x30
+END (__longjmp)
+libc_hidden_def(__longjmp)
diff --git a/libc/sysdeps/linux/aarch64/__syscall_error.c b/libc/sysdeps/linux/aarch64/__syscall_error.c
new file mode 100644
index 000000000..2b642e816
--- /dev/null
+++ b/libc/sysdeps/linux/aarch64/__syscall_error.c
@@ -0,0 +1,18 @@
+/* Wrapper for setting errno.
+ *
+ * Copyright (C) 2000-2006 Erik Andersen <andersen@uclibc.org>
+ *
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+#include <errno.h>
+#include <features.h>
+
+/* This routine is jumped to by all the syscall handlers, to stash
+ * an error number into errno.  */
+int __syscall_error(int err_no) attribute_hidden;
+int __syscall_error(int err_no)
+{
+	__set_errno(-err_no);
+	return -1;
+}
diff --git a/libc/sysdeps/linux/aarch64/bits/atomic.h b/libc/sysdeps/linux/aarch64/bits/atomic.h
new file mode 100644
index 000000000..66e2f57d6
--- /dev/null
+++ b/libc/sysdeps/linux/aarch64/bits/atomic.h
@@ -0,0 +1,172 @@
+/* Copyright (C) 2003-2017 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/>.  */
+
+#ifndef _AARCH64_ATOMIC_MACHINE_H
+#define _AARCH64_ATOMIC_MACHINE_H	1
+
+#define typeof __typeof__
+
+#include <stdint.h>
+#include <sysdep.h>
+
+typedef int8_t  atomic8_t;
+typedef int16_t atomic16_t;
+typedef int32_t atomic32_t;
+typedef int64_t atomic64_t;
+
+typedef uint8_t  uatomic8_t;
+typedef uint16_t uatomic16_t;
+typedef uint32_t uatomic32_t;
+typedef uint64_t uatomic64_t;
+
+typedef intptr_t atomicptr_t;
+typedef uintptr_t uatomicptr_t;
+typedef intmax_t atomic_max_t;
+typedef uintmax_t uatomic_max_t;
+
+#define __HAVE_64B_ATOMICS 1
+#define USE_ATOMIC_COMPILER_BUILTINS 1
+
+/* Compare and exchange.
+   For all "bool" routines, we return FALSE if exchange succesful.  */
+
+# define __arch_compare_and_exchange_bool_8_int(mem, newval, oldval, model) \
+  ({									\
+    typeof (*mem) __oldval = (oldval);					\
+    !__atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0,	\
+				  model, __ATOMIC_RELAXED);		\
+  })
+
+# define __arch_compare_and_exchange_bool_16_int(mem, newval, oldval, model) \
+  ({									\
+    typeof (*mem) __oldval = (oldval);					\
+    !__atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0,	\
+				  model, __ATOMIC_RELAXED);		\
+  })
+
+# define __arch_compare_and_exchange_bool_32_int(mem, newval, oldval, model) \
+  ({									\
+    typeof (*mem) __oldval = (oldval);					\
+    !__atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0,	\
+				  model, __ATOMIC_RELAXED);		\
+  })
+
+#  define __arch_compare_and_exchange_bool_64_int(mem, newval, oldval, model) \
+  ({									\
+    typeof (*mem) __oldval = (oldval);					\
+    !__atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0,	\
+				  model, __ATOMIC_RELAXED);		\
+  })
+
+# define __arch_compare_and_exchange_val_8_int(mem, newval, oldval, model) \
+  ({									\
+    typeof (*mem) __oldval = (oldval);					\
+    __atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0,	\
+				 model, __ATOMIC_RELAXED);		\
+    __oldval;								\
+  })
+
+# define __arch_compare_and_exchange_val_16_int(mem, newval, oldval, model) \
+  ({									\
+    typeof (*mem) __oldval = (oldval);					\
+    __atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0,	\
+				 model, __ATOMIC_RELAXED);		\
+    __oldval;								\
+  })
+
+# define __arch_compare_and_exchange_val_32_int(mem, newval, oldval, model) \
+  ({									\
+    typeof (*mem) __oldval = (oldval);					\
+    __atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0,	\
+				 model, __ATOMIC_RELAXED);		\
+    __oldval;								\
+  })
+
+#  define __arch_compare_and_exchange_val_64_int(mem, newval, oldval, model) \
+  ({									\
+    typeof (*mem) __oldval = (oldval);					\
+    __atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0,	\
+				 model, __ATOMIC_RELAXED);		\
+    __oldval;								\
+  })
+
+
+/* Compare and exchange with "acquire" semantics, ie barrier after.  */
+
+# define atomic_compare_and_exchange_bool_acq(mem, new, old)	\
+  __atomic_bool_bysize (__arch_compare_and_exchange_bool, int,	\
+			mem, new, old, __ATOMIC_ACQUIRE)
+
+# define atomic_compare_and_exchange_val_acq(mem, new, old)	\
+  __atomic_val_bysize (__arch_compare_and_exchange_val, int,	\
+		       mem, new, old, __ATOMIC_ACQUIRE)
+
+/* Compare and exchange with "release" semantics, ie barrier before.  */
+
+# define atomic_compare_and_exchange_val_rel(mem, new, old)	 \
+  __atomic_val_bysize (__arch_compare_and_exchange_val, int,    \
+                       mem, new, old, __ATOMIC_RELEASE)
+
+
+/* Atomic exchange (without compare).  */
+
+# define __arch_exchange_8_int(mem, newval, model)	\
+  __atomic_exchange_n (mem, newval, model)
+
+# define __arch_exchange_16_int(mem, newval, model)	\
+  __atomic_exchange_n (mem, newval, model)
+
+# define __arch_exchange_32_int(mem, newval, model)	\
+  __atomic_exchange_n (mem, newval, model)
+
+#  define __arch_exchange_64_int(mem, newval, model)	\
+  __atomic_exchange_n (mem, newval, model)
+
+# define atomic_exchange_acq(mem, value)				\
+  __atomic_val_bysize (__arch_exchange, int, mem, value, __ATOMIC_ACQUIRE)
+
+# define atomic_exchange_rel(mem, value)				\
+  __atomic_val_bysize (__arch_exchange, int, mem, value, __ATOMIC_RELEASE)
+
+
+/* Atomically add value and return the previous (unincremented) value.  */
+
+# define __arch_exchange_and_add_8_int(mem, value, model)	\
+  __atomic_fetch_add (mem, value, model)
+
+# define __arch_exchange_and_add_16_int(mem, value, model)	\
+  __atomic_fetch_add (mem, value, model)
+
+# define __arch_exchange_and_add_32_int(mem, value, model)	\
+  __atomic_fetch_add (mem, value, model)
+
+#  define __arch_exchange_and_add_64_int(mem, value, model)	\
+  __atomic_fetch_add (mem, value, model)
+
+# define atomic_exchange_and_add_acq(mem, value)			\
+  __atomic_val_bysize (__arch_exchange_and_add, int, mem, value,	\
+		       __ATOMIC_ACQUIRE)
+
+# define atomic_exchange_and_add_rel(mem, value)			\
+  __atomic_val_bysize (__arch_exchange_and_add, int, mem, value,	\
+		       __ATOMIC_RELEASE)
+
+/* Barrier macro. */
+#define atomic_full_barrier() __sync_synchronize()
+
+#endif
diff --git a/libc/sysdeps/linux/aarch64/bits/endian.h b/libc/sysdeps/linux/aarch64/bits/endian.h
new file mode 100644
index 000000000..a32ebc0d8
--- /dev/null
+++ b/libc/sysdeps/linux/aarch64/bits/endian.h
@@ -0,0 +1,30 @@
+/* Copyright (C) 1997-2016 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/>.  */
+
+#ifndef _ENDIAN_H
+# error "Never use <bits/endian.h> directly; include <endian.h> instead."
+#endif
+
+/* AArch64 can be either big or little endian.  */
+#ifdef __AARCH64EB__
+# define __BYTE_ORDER __BIG_ENDIAN
+#else
+# define __BYTE_ORDER __LITTLE_ENDIAN
+#endif
+
+#define __FLOAT_WORD_ORDER __BYTE_ORDER
diff --git a/libc/sysdeps/linux/aarch64/bits/fcntl.h b/libc/sysdeps/linux/aarch64/bits/fcntl.h
new file mode 100644
index 000000000..d05798f31
--- /dev/null
+++ b/libc/sysdeps/linux/aarch64/bits/fcntl.h
@@ -0,0 +1,329 @@
+/* O_*, F_*, FD_* bit values for the AArch64 Linux ABI.
+   Copyright (C) 2011-2016 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/>.  */
+
+#ifndef	_FCNTL_H
+# error "Never use <bits/fcntl.h> directly; include <fcntl.h> instead."
+#endif
+
+#include <sys/types.h>
+#ifdef __USE_GNU
+# include <bits/uio.h>
+#endif
+
+/* open/fcntl.  */
+#define O_ACCMODE	   0003
+#define O_RDONLY	     00
+#define O_WRONLY	     01
+#define O_RDWR		     02
+#define O_CREAT		   0100	/* Not fcntl.  */
+#define O_EXCL		   0200	/* Not fcntl.  */
+#define O_NOCTTY	   0400	/* Not fcntl.  */
+#define O_TRUNC		  01000	/* Not fcntl.  */
+#define O_APPEND	  02000
+#define O_NONBLOCK	  04000
+#define O_NDELAY	O_NONBLOCK
+#define O_SYNC	       04010000
+#define O_FSYNC		 O_SYNC
+#define O_ASYNC		 020000
+
+#ifdef __USE_GNU
+# define O_DIRECTORY	 040000
+# define O_NOFOLLOW	0100000
+# define O_DIRECT	0200000
+# define O_NOATIME     01000000
+# define O_CLOEXEC     02000000
+# define O_PATH       010000000
+#endif
+
+/* For now Linux has synchronisity options for data and read operations.
+   We define the symbols here but let them do the same as O_SYNC since
+   this is a superset.	*/
+#if defined __USE_POSIX199309 || defined __USE_UNIX98
+# define O_DSYNC	O_SYNC	/* Synchronize data.  */
+# define O_RSYNC	O_SYNC	/* Synchronize read operations.	 */
+#endif
+
+#ifdef __USE_LARGEFILE64
+# define O_LARGEFILE	0
+#endif
+
+/* Values for the second argument to `fcntl'.  */
+#define F_DUPFD		0	/* Duplicate file descriptor.  */
+#define F_GETFD		1	/* Get file descriptor flags.  */
+#define F_SETFD		2	/* Set file descriptor flags.  */
+#define F_GETFL		3	/* Get file status flags.  */
+#define F_SETFL		4	/* Set file status flags.  */
+#ifndef __USE_FILE_OFFSET64
+# define F_GETLK	5	/* Get record locking info.  */
+# define F_SETLK	6	/* Set record locking info (non-blocking).  */
+# define F_SETLKW	7	/* Set record locking info (blocking).	*/
+#else
+# define F_GETLK	F_GETLK64  /* Get record locking info.	*/
+# define F_SETLK	F_SETLK64  /* Set record locking info (non-blocking).*/
+# define F_SETLKW	F_SETLKW64 /* Set record locking info (blocking).  */
+#endif
+#define F_GETLK64	5	/* Get record locking info.  */
+#define F_SETLK64	6	/* Set record locking info (non-blocking).  */
+#define F_SETLKW64	7	/* Set record locking info (blocking).	*/
+
+#if defined __USE_BSD || defined __USE_UNIX98
+# define F_SETOWN	8	/* Get owner of socket (receiver of SIGIO).  */
+# define F_GETOWN	9	/* Set owner of socket (receiver of SIGIO).  */
+#endif
+
+#ifdef __USE_GNU
+# define F_SETSIG	10	/* Set number of signal to be sent.  */
+# define F_GETSIG	11	/* Get number of signal to be sent.  */
+# define F_SETOWN_EX	15	/* Get owner (thread receiving SIGIO).  */
+# define F_GETOWN_EX	16	/* Set owner (thread receiving SIGIO).  */
+#endif
+
+
+#ifdef __USE_GNU
+# define F_SETLEASE	1024	/* Set a lease.	 */
+# define F_GETLEASE	1025	/* Enquire what lease is active.  */
+# define F_NOTIFY	1026	/* Request notifications on a directory.  */
+# define F_SETPIPE_SZ	1031	/* Set pipe page size array.  */
+# define F_GETPIPE_SZ	1032	/* Set pipe page size array.  */
+#endif
+#ifdef __USE_XOPEN2K8
+# define F_DUPFD_CLOEXEC 1030	/* Duplicate file descriptor with
+				   close-on-exit set.  */
+#endif
+
+/* For F_[GET|SET]FD.  */
+#define FD_CLOEXEC	1	/* Actually anything with low bit set goes */
+
+/* For posix fcntl() and `l_type' field of a `struct flock' for lockf().  */
+# define F_RDLCK		0	/* Read lock.  */
+# define F_WRLCK		1	/* Write lock.	*/
+# define F_UNLCK		2	/* Remove lock.	 */
+
+/* For old implementation of BSD flock.  */
+#define F_EXLCK		4	/* or 3 */
+#define F_SHLCK		8	/* or 4 */
+
+#ifdef __USE_BSD
+/* Operations for BSD flock, also used by the kernel implementation.  */
+# define LOCK_SH	1	/* Shared lock.  */
+# define LOCK_EX	2	/* Exclusive lock.  */
+# define LOCK_NB	4	/* Or'd with one of the above to prevent
+				   blocking.  */
+# define LOCK_UN	8	/* Remove lock.  */
+#endif
+
+#ifdef __USE_GNU
+# define LOCK_MAND	32	/* This is a mandatory flock:	*/
+# define LOCK_READ	64	/* ... which allows concurrent read operations.	 */
+# define LOCK_WRITE	128	/* ... which allows concurrent write operations.  */
+# define LOCK_RW	192	/* ... Which allows concurrent read & write operations.	 */
+#endif
+
+#ifdef __USE_GNU
+/* Types of directory notifications that may be requested with F_NOTIFY.  */
+# define DN_ACCESS	0x00000001	/* File accessed.  */
+# define DN_MODIFY	0x00000002	/* File modified.  */
+# define DN_CREATE	0x00000004	/* File created.  */
+# define DN_DELETE	0x00000008	/* File removed.  */
+# define DN_RENAME	0x00000010	/* File renamed.  */
+# define DN_ATTRIB	0x00000020	/* File changed attributes.  */
+# define DN_MULTISHOT	0x80000000	/* Don't remove notifier.  */
+#endif
+
+struct flock
+  {
+    short int l_type;	/* Type of lock: F_RDLCK, F_WRLCK, or F_UNLCK.	*/
+    short int l_whence;	/* Where `l_start' is relative to (like `lseek').  */
+    __off_t l_start;	/* Offset where the lock begins.  */
+    __off_t l_len;	/* Size of the locked area; zero means until EOF.  */
+    __pid_t l_pid;	/* Process holding the lock.  */
+  };
+
+#ifdef __USE_LARGEFILE64
+struct flock64
+  {
+    short int l_type;	/* Type of lock: F_RDLCK, F_WRLCK, or F_UNLCK.	*/
+    short int l_whence;	/* Where `l_start' is relative to (like `lseek').  */
+    __off64_t l_start;	/* Offset where the lock begins.  */
+    __off64_t l_len;	/* Size of the locked area; zero means until EOF.  */
+    __pid_t l_pid;	/* Process holding the lock.  */
+  };
+#endif
+
+
+#ifdef __USE_GNU
+/* Owner types.  */
+enum __pid_type
+  {
+    F_OWNER_TID = 0,		/* Kernel thread.  */
+    F_OWNER_PID,		/* Process.  */
+    F_OWNER_PGRP,		/* Process group.  */
+    F_OWNER_GID = F_OWNER_PGRP	/* Alternative, obsolete name.  */
+  };
+
+/* Structure to use with F_GETOWN_EX and F_SETOWN_EX.  */
+struct f_owner_ex
+  {
+    enum __pid_type type;	/* Owner type of ID.  */
+    __pid_t pid;		/* ID of owner.  */
+  };
+#endif
+
+/* Define some more compatibility macros to be backward compatible with
+   BSD systems which did not managed to hide these kernel macros.  */
+#ifdef	__USE_BSD
+# define FAPPEND	O_APPEND
+# define FFSYNC		O_FSYNC
+# define FASYNC		O_ASYNC
+# define FNONBLOCK	O_NONBLOCK
+# define FNDELAY	O_NDELAY
+#endif /* Use BSD.  */
+
+/* Advise to `posix_fadvise'.  */
+#ifdef __USE_XOPEN2K
+# define POSIX_FADV_NORMAL	0 /* No further special treatment.  */
+# define POSIX_FADV_RANDOM	1 /* Expect random page references.  */
+# define POSIX_FADV_SEQUENTIAL	2 /* Expect sequential page references.	 */
+# define POSIX_FADV_WILLNEED	3 /* Will need these pages.  */
+# define POSIX_FADV_DONTNEED	4 /* Don't need these pages.  */
+# define POSIX_FADV_NOREUSE	5 /* Data will be accessed once.  */
+#endif
+
+
+#if defined __USE_GNU && defined __UCLIBC_LINUX_SPECIFIC__
+/* Flags for SYNC_FILE_RANGE.  */
+# define SYNC_FILE_RANGE_WAIT_BEFORE	1 /* Wait upon writeout of all pages
+					     in the range before performing the
+					     write.  */
+# define SYNC_FILE_RANGE_WRITE		2 /* Initiate writeout of all those
+					     dirty pages in the range which are
+					     not presently under writeback.  */
+# define SYNC_FILE_RANGE_WAIT_AFTER	4 /* Wait upon writeout of all pages in
+					     the range after performing the
+					     write.  */
+
+/* Flags for SPLICE and VMSPLICE.  */
+# define SPLICE_F_MOVE		1	/* Move pages instead of copying.  */
+# define SPLICE_F_NONBLOCK	2	/* Don't block on the pipe splicing
+					   (but we may still block on the fd
+					   we splice from/to).  */
+# define SPLICE_F_MORE		4	/* Expect more data.  */
+# define SPLICE_F_GIFT		8	/* Pages passed in are a gift.  */
+
+
+/* Flags for fallocate.  */
+# define FALLOC_FL_KEEP_SIZE		1 /* Don't extend size of file
+					     even if offset + len is
+					     greater than file size.  */
+# define FALLOC_FL_PUNCH_HOLE		2 /* Create a hole in the file.  */
+# define FALLOC_FL_COLLAPSE_RANGE	8 /* Remove a range of a file
+					     without leaving a
+					     hole.  */
+# define FALLOC_FL_ZERO_RANGE		16 /* Convert a range of a
+					      file to zeros.  */
+
+
+/* File handle structure.  */
+struct file_handle
+{
+  unsigned int handle_bytes;
+  int handle_type;
+  /* File identifier.  */
+  unsigned char f_handle[0];
+};
+
+/* Maximum handle size (for now).  */
+# define MAX_HANDLE_SZ	128
+#endif
+
+__BEGIN_DECLS
+
+#if defined __USE_GNU && defined __UCLIBC_LINUX_SPECIFIC__
+
+/* Provide kernel hint to read ahead.  */
+extern ssize_t readahead (int __fd, __off64_t __offset, size_t __count)
+    __THROW;
+
+
+/* Selective file content synch'ing.
+
+   This function is a possible cancellation point and therefore not
+   marked with __THROW.  */
+extern int sync_file_range (int __fd, __off64_t __offset, __off64_t __count,
+			    unsigned int __flags);
+
+
+/* Splice address range into a pipe.
+
+   This function is a possible cancellation point and therefore not
+   marked with __THROW.  */
+extern ssize_t vmsplice (int __fdout, const struct iovec *__iov,
+			 size_t __count, unsigned int __flags);
+
+/* Splice two files together.
+
+   This function is a possible cancellation point and therefore not
+   marked with __THROW.  */
+extern ssize_t splice (int __fdin, __off64_t *__offin, int __fdout,
+		       __off64_t *__offout, size_t __len,
+		       unsigned int __flags);
+
+/* In-kernel implementation of tee for pipe buffers.
+
+   This function is a possible cancellation point and therefore not
+   marked with __THROW.  */
+extern ssize_t tee (int __fdin, int __fdout, size_t __len,
+		    unsigned int __flags);
+
+/* Reserve storage for the data of the file associated with FD.
+
+   This function is a possible cancellation point and therefore not
+   marked with __THROW.  */
+# ifndef __USE_FILE_OFFSET64
+extern int fallocate (int __fd, int __mode, __off_t __offset, __off_t __len);
+# else
+#  ifdef __REDIRECT
+extern int __REDIRECT (fallocate, (int __fd, int __mode, __off64_t __offset,
+				   __off64_t __len),
+		       fallocate64);
+#  else
+#   define fallocate fallocate64
+#  endif
+# endif
+# ifdef __USE_LARGEFILE64
+extern int fallocate64 (int __fd, int __mode, __off64_t __offset,
+			__off64_t __len);
+# endif
+
+
+/* Map file name to file handle.  */
+extern int name_to_handle_at (int __dfd, const char *__name,
+			      struct file_handle *__handle, int *__mnt_id,
+			      int __flags) __THROW;
+
+/* Open file using the file handle.
+
+   This function is a possible cancellation point and therefore not
+   marked with __THROW.  */
+extern int open_by_handle_at (int __mountdirfd, struct file_handle *__handle,
+			      int __flags);
+
+#endif	/* use GNU */
+
+__END_DECLS
diff --git a/libc/sysdeps/linux/aarch64/bits/kernel_types.h b/libc/sysdeps/linux/aarch64/bits/kernel_types.h
new file mode 100644
index 000000000..832b17674
--- /dev/null
+++ b/libc/sysdeps/linux/aarch64/bits/kernel_types.h
@@ -0,0 +1,42 @@
+/* Note that we use the exact same include guard #define names
+ * as asm/posix_types.h.  This will avoid gratuitous conflicts
+ * with the posix_types.h kernel header, and will ensure that
+ * our private content, and not the kernel header, will win.
+ *  -Erik
+ */
+#ifndef __ASM_GENERIC_POSIX_TYPES_H
+#define __ASM_GENERIC_POSIX_TYPES_H
+
+typedef unsigned long		__kernel_dev_t;
+typedef unsigned long		__kernel_ino_t;
+typedef unsigned int		__kernel_mode_t;
+typedef unsigned int		__kernel_nlink_t;
+typedef long			__kernel_off_t;
+typedef int			__kernel_pid_t;
+typedef int 			__kernel_ipc_pid_t;
+typedef unsigned int		__kernel_uid_t;
+typedef unsigned int		__kernel_gid_t;
+typedef unsigned long		__kernel_size_t;
+typedef long			__kernel_ssize_t;
+typedef long			__kernel_ptrdiff_t;
+typedef long			__kernel_time_t;
+typedef long			__kernel_suseconds_t;
+typedef long			__kernel_clock_t;
+typedef int			__kernel_daddr_t;