tile: add basic support for tilegx

This adds basic support for tile architecture.
Only static binaries, no ld.so or threading support.
Tested with qemu-tilegx only.

32 files changed, 2044 insertions, 1 deletions

diff --git a/libc/sysdeps/linux/common/fstat.c b/libc/sysdeps/linux/common/fstat.c
index 689259531..53fa82680 100644
--- a/libc/sysdeps/linux/common/fstat.c
+++ b/libc/sysdeps/linux/common/fstat.c
@@ -20,7 +20,7 @@ int fstat(int fd, struct stat *buf)
 }
 libc_hidden_def(fstat)
 
-#elif __WORDSIZE == 64 && defined __NR_newfstatat && __aarch64__
+#elif __WORDSIZE == 64 && defined __NR_newfstatat
 #include <fcntl.h>
 
 int fstat(int fd, struct stat *buf)
diff --git a/libc/sysdeps/linux/tile/Makefile b/libc/sysdeps/linux/tile/Makefile
new file mode 100644
index 000000000..43dc60a42
--- /dev/null
+++ b/libc/sysdeps/linux/tile/Makefile
@@ -0,0 +1,6 @@
+top_srcdir=../../../../
+top_builddir=../../../../
+all: objs
+include $(top_builddir)Rules.mak
+include Makefile.arch
+include $(top_srcdir)Makerules
diff --git a/libc/sysdeps/linux/tile/Makefile.arch b/libc/sysdeps/linux/tile/Makefile.arch
new file mode 100644
index 000000000..74c074852
--- /dev/null
+++ b/libc/sysdeps/linux/tile/Makefile.arch
@@ -0,0 +1,2 @@
+CSRC-y := __syscall_error.c
+SSRC-y := __longjmp.S setjmp.S vfork.S clone.S
diff --git a/libc/sysdeps/linux/tile/__longjmp.S b/libc/sysdeps/linux/tile/__longjmp.S
new file mode 100644
index 000000000..08724db0a
--- /dev/null
+++ b/libc/sysdeps/linux/tile/__longjmp.S
@@ -0,0 +1,54 @@
+/* Copyright (C) 2011-2018 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>
+#include <jmpbuf-offsets.h>
+#include <arch/spr_def.h>
+
+/* PL to return to via iret in longjmp */
+#define RETURN_PL 0
+
+	.text
+ENTRY (__longjmp)
+
+#define RESTORE(r) { ld r, r0 ; ADDI_PTR r0, r0, REGSIZE }
+	FOR_EACH_CALLEE_SAVED_REG(RESTORE)
+
+	/* Make longjmp(buf, 0) return "1" instead.
+	   At the same time, construct our iret context; we set ICS so
+	   we can validly load EX_CONTEXT for iret without being
+	   interrupted halfway through.  */
+	{
+	 ld r2, r0   /* retrieve ICS bit from jmp_buf */
+	 movei r3, 1
+	 cmpeqi r0, r1, 0
+	}
+	{
+	 mtspr INTERRUPT_CRITICAL_SECTION, r3
+	 shli r2, r2, SPR_EX_CONTEXT_0_1__ICS_SHIFT
+	}
+	{
+	 mtspr EX_CONTEXT_0_0, lr
+	 ori r2, r2, RETURN_PL
+	}
+	{
+	 or r0, r1, r0
+	 mtspr EX_CONTEXT_0_1, r2
+	}
+	iret
+	jrp lr   /* Keep the backtracer happy. */
+END (__longjmp)
+libc_hidden_def(__longjmp)
diff --git a/libc/sysdeps/linux/tile/__syscall_error.c b/libc/sysdeps/linux/tile/__syscall_error.c
new file mode 100644
index 000000000..a91fdff3a
--- /dev/null
+++ b/libc/sysdeps/linux/tile/__syscall_error.c
@@ -0,0 +1,14 @@
+/*
+ * Licensed under the LGPL v2.1 or later, see the file COPYING.LIB
+ * in this tarball.
+ */
+
+#include <errno.h>
+#include <features.h>
+
+int __syscall_error(int err_no)
+{
+	__set_errno(-err_no);
+	return -1;
+}
+
diff --git a/libc/sysdeps/linux/tile/bits/byteswap.h b/libc/sysdeps/linux/tile/bits/byteswap.h
new file mode 100644
index 000000000..524a35576
--- /dev/null
+++ b/libc/sysdeps/linux/tile/bits/byteswap.h
@@ -0,0 +1,35 @@
+/* Copyright (C) 2011-2018 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/>.  */
+
+#if !defined _BYTESWAP_H && !defined _NETINET_IN_H && !defined _ENDIAN_H
+# error "Never use <bits/byteswap.h> directly; include <byteswap.h> instead."
+#endif
+
+#ifndef _BITS_BYTESWAP_H
+#define _BITS_BYTESWAP_H 1
+
+#include <bits/types.h>
+
+/* gcc __builtin_bswap64() can constant-fold, etc, so always use it. */
+#define __bswap_16(x) ((unsigned short)(__builtin_bswap32(x) >> 16))
+#define __bswap_32(x) ((unsigned int)__builtin_bswap32(x))
+#define __bswap_64(x) ((__uint64_t)__builtin_bswap64(x))
+
+#define __bswap_constant_16(x) __bswap_16(x)
+#define __bswap_constant_32(x) __bswap_32(x)
+#define __bswap_constant_64(x) __bswap_64(x)
+
+#endif /* _BITS_BYTESWAP_H */
diff --git a/libc/sysdeps/linux/tile/bits/endian.h b/libc/sysdeps/linux/tile/bits/endian.h
new file mode 100644
index 000000000..835042a7a
--- /dev/null
+++ b/libc/sysdeps/linux/tile/bits/endian.h
@@ -0,0 +1,11 @@
+/* Set endianness for tile.  */
+
+#ifndef _ENDIAN_H
+# error "Never use <bits/endian.h> directly; include <endian.h> instead."
+#endif
+
+#if defined __BIG_ENDIAN__
+# define __BYTE_ORDER __BIG_ENDIAN
+#else
+# define __BYTE_ORDER __LITTLE_ENDIAN
+#endif
diff --git a/libc/sysdeps/linux/tile/bits/fcntl.h b/libc/sysdeps/linux/tile/bits/fcntl.h
new file mode 100644
index 000000000..3cb4d2caf
--- /dev/null
+++ b/libc/sysdeps/linux/tile/bits/fcntl.h
@@ -0,0 +1,228 @@
+/* O_*, F_*, FD_* bit values for Linux.
+ *
+ * Licensed under the LGPL v2.1 or later, see the file 
+ * COPYING.LIB in this tarball.
+ */
+
+#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 - O_SYNC is only implemented on blocks devices and on files
+   located on an ext2 file system */
+#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		010000
+#define O_FSYNC		O_SYNC
+#define O_ASYNC		020000
+
+#ifdef __USE_XOPEN2K8
+# define O_DIRECTORY   0200000	/* Must be a directory.	 */
+# define O_NOFOLLOW    0400000	/* Do not follow links.	 */
+# define O_CLOEXEC    02000000	/* Set close_on_exec.  */
+#endif
+
+#ifdef __USE_GNU
+# define O_DIRECT	040000	/* Direct disk access.	*/
+# define O_NOATIME    01000000	/* Do not set atime.  */
+# define O_PATH	     010000000  /* Resolve pathname but do not open file.  */
+#endif
+
+#ifdef __USE_LARGEFILE64
+# define O_LARGEFILE   0100000
+#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
+
+/* 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	12	/* Get record locking info.  */
+#define F_SETLK64	13	/* Set record locking info (non-blocking).  */
+#define F_SETLKW64	14	/* Set record locking info (blocking).	*/
+
+#if defined __USE_BSD || defined __USE_XOPEN2K
+# 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.  */
+#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 notfications on a directory.	 */
+# define F_DUPFD_CLOEXEC 1030	/* Duplicate file descriptor with
+				   close-on-exit set on new fd.  */
+# define F_SETPIPE_SZ	1031    /* Set pipe page size array.  */
+# define F_GETPIPE_SZ	1032    /* Get pipe page size array.  */
+#endif
+
+/* For F_[GET|SET]FL.  */
+#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 attibutes.  */
+# 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').  */
+#ifndef __USE_FILE_OFFSET64
+    __off_t l_start;	/* Offset where the lock begins.  */
+    __off_t l_len;	/* Size of the locked area; zero means until EOF.  */
+#else
+    __off64_t l_start;	/* Offset where the lock begins.  */
+    __off64_t l_len;	/* Size of the locked area; zero means until EOF.  */
+#endif
+    __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
+
+/* 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.  */
+#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.  */
+extern int sync_file_range (int __fd, __off64_t __from, __off64_t __to,
+			    unsigned int __flags);
+
+/* Splice address range into a pipe.  */
+extern ssize_t vmsplice (int __fdout, const struct iovec *__iov,
+			 size_t __count, unsigned int __flags);
+
+/* Splice two files together.  */
+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.  */
+extern ssize_t tee (int __fdin, int __fdout, size_t __len,
+		    unsigned int __flags);
+
+#endif
+__END_DECLS
diff --git a/libc/sysdeps/linux/tile/bits/kernel_types.h b/libc/sysdeps/linux/tile/bits/kernel_types.h
new file mode 100644
index 000000000..a17c03445
--- /dev/null
+++ b/libc/sysdeps/linux/tile/bits/kernel_types.h
@@ -0,0 +1,45 @@
+/*
+ * Licensed under the LGPL v2.1 or later, see the file COPYING.LIB
+ * in this tarball.
+ */
+
+#ifndef __ASM_GENERIC_POSIX_TYPES_H
+#define __ASM_GENERIC_POSIX_TYPES_H
+
+typedef unsigned short	__kernel_dev_t;
+typedef unsigned long	__kernel_ino_t;
+typedef unsigned short	__kernel_mode_t;
+typedef unsigned short	__kernel_nlink_t;
+typedef long		__kernel_off_t;
+typedef int		__kernel_pid_t;
+typedef unsigned short	__kernel_ipc_pid_t;
+typedef unsigned short	__kernel_uid_t;
+typedef unsigned short	__kernel_gid_t;
+typedef unsigned int	__kernel_size_t;
+typedef int		__kernel_ssize_t;
+typedef int		__kernel_ptrdiff_t;
+typedef long		__kernel_time_t;
+typedef long		__kernel_suseconds_t;
+typedef long		__kernel_clock_t;
+typedef int		__kernel_daddr_t;
+typedef char *		__kernel_caddr_t;
+typedef unsigned short	__kernel_uid16_t;
+typedef unsigned short	__kernel_gid16_t;
+typedef unsigned int	__kernel_uid32_t;
+typedef unsigned int	__kernel_gid32_t;
+typedef unsigned short	__kernel_old_uid_t;
+typedef unsigned short	__kernel_old_gid_t;
+typedef long long	__kernel_loff_t;
+typedef __kernel_dev_t  __kernel_old_dev_t;
+typedef long		__kernel_long_t;
+typedef unsigned long	__kernel_ulong_t;
+
+typedef struct {
+#ifdef __USE_ALL
+	int val[2];
+#else
+	int __val[2];
+#endif
+} __kernel_fsid_t;
+
+#endif
diff --git a/libc/sysdeps/linux/tile/bits/mman.h b/libc/sysdeps/linux/tile/bits/mman.h
new file mode 100644
index 000000000..9fe3b9849
--- /dev/null
+++ b/libc/sysdeps/linux/tile/bits/mman.h
@@ -0,0 +1,38 @@
+/* Copyright (C) 2011-2018 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/>.  */
+
+#ifndef _SYS_MMAN_H
+# error "Never use <bits/mman.h> directly; include <sys/mman.h> instead."
+#endif
+
+/* The following definitions basically come from the kernel headers.
+   But the kernel header is not namespace clean.  */
+
+#ifdef __USE_MISC
+/* These are Linux-specific.  */
+# define MAP_NONBLOCK	0x00080		/* Do not block on IO.  */
+# define MAP_GROWSDOWN	0x00100		/* Stack-like segment.  */
+# define MAP_STACK	MAP_GROWSDOWN	/* Provide convenience alias.  */
+# define MAP_LOCKED	0x00200		/* Lock the mapping.  */
+# define MAP_NORESERVE	0x00400		/* Don't check for reservations.  */
+# define MAP_DENYWRITE	0x00800		/* ETXTBSY */
+# define MAP_EXECUTABLE	0x01000		/* Mark it as an executable.  */
+# define MAP_POPULATE	0x00040		/* Populate (prefault) pagetables.  */
+# define MAP_HUGETLB	0x04000		/* Create huge page mapping.  */
+#endif
+
+/* Include generic Linux declarations.  */
+#include <bits/mman-linux.h>
diff --git a/libc/sysdeps/linux/tile/bits/setjmp.h b/libc/sysdeps/linux/tile/bits/setjmp.h
new file mode 100644
index 000000000..47b46db46
--- /dev/null
+++ b/libc/sysdeps/linux/tile/bits/setjmp.h
@@ -0,0 +1,34 @@
+/* Copyright (C) 2011-2018 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/>.  */
+
+/* Define the machine-dependent type `jmp_buf'.  TILE version.  */
+#ifndef _BITS_SETJMP_H
+#define _BITS_SETJMP_H	1
+
+#if !defined _SETJMP_H && !defined _PTHREAD_H
+# error "Never include <bits/setjmp.h> directly; use <setjmp.h> instead."
+#endif
+
+#ifndef _ASM
+
+#define __need_int_reg_t
+#include <arch/abi.h>
+
+typedef __uint_reg_t __jmp_buf[32];
+
+#endif
+
+#endif /* bits/setjmp.h */
diff --git a/libc/sysdeps/linux/tile/bits/shm.h b/libc/sysdeps/linux/tile/bits/shm.h
new file mode 100644
index 000000000..dbe4851f9
--- /dev/null
+++ b/libc/sysdeps/linux/tile/bits/shm.h
@@ -0,0 +1,90 @@
+/*
+ * Licensed under the LGPL v2.1 or later, see the file COPYING.LIB
+ * in this tarball.
+ */
+
+#ifndef _SYS_SHM_H
+# error "Never include <bits/shm.h> directly; use <sys/shm.h> instead."
+#endif
+
+#include <bits/types.h>
+
+/* Permission flag for shmget.  */
+#define SHM_R		0400		/* or S_IRUGO from <linux/stat.h> */
+#define SHM_W		0200		/* or S_IWUGO from <linux/stat.h> */
+
+/* Flags for `shmat'.  */
+#define SHM_RDONLY	010000		/* attach read-only else read-write */
+#define SHM_RND		020000		/* round attach address to SHMLBA */
+#define SHM_REMAP	040000		/* take-over region on attach */
+
+/* Commands for `shmctl'.  */
+#define SHM_LOCK	11		/* lock segment (root only) */
+#define SHM_UNLOCK	12		/* unlock segment (root only) */
+
+__BEGIN_DECLS
+
+/* Segment low boundary address multiple.  */
+#define SHMLBA		(__getpagesize () << 2)
+extern int __getpagesize (void) __THROW __attribute__ ((__const__));
+
+
+/* Type to count number of attaches.  */
+typedef unsigned long int shmatt_t;
+
+/* Data structure describing a set of semaphores.  */
+struct shmid_ds
+  {
+    struct ipc_perm shm_perm;		/* operation permission struct */
+    size_t shm_segsz;			/* size of segment in bytes */
+    __time_t shm_atime;			/* time of last shmat() */
+    unsigned long int __unused1;
+    __time_t shm_dtime;			/* time of last shmdt() */
+    unsigned long int __unused2;
+    __time_t shm_ctime;			/* time of last change by shmctl() */
+    unsigned long int __unused3;
+    __pid_t shm_cpid;			/* pid of creator */
+    __pid_t shm_lpid;			/* pid of last shmop */
+    shmatt_t shm_nattch;		/* number of current attaches */
+    unsigned long int __unused4;
+    unsigned long int __unused5;
+  };
+
+#ifdef __USE_MISC
+
+/* ipcs ctl commands */
+# define SHM_STAT 	13
+# define SHM_INFO 	14
+
+/* shm_mode upper byte flags */
+# define SHM_DEST	01000	/* segment will be destroyed on last detach */
+# define SHM_LOCKED	02000   /* segment will not be swapped */
+# define SHM_HUGETLB	04000	/* segment is mapped via hugetlb */
+# define SHM_NORESERVE	010000	/* don't check for reservations */
+
+struct	shminfo
+  {
+    unsigned long int shmmax;
+    unsigned long int shmmin;
+    unsigned long int shmmni;
+    unsigned long int shmseg;
+    unsigned long int shmall;
+    unsigned long int __unused1;
+    unsigned long int __unused2;
+    unsigned long int __unused3;
+    unsigned long int __unused4;
+  };
+
+struct shm_info
+  {
+    int used_ids;
+    unsigned long int shm_tot;	/* total allocated shm */
+    unsigned long int shm_rss;	/* total resident shm */
+    unsigned long int shm_swp;	/* total swapped shm */
+    unsigned long int swap_attempts;
+    unsigned long int swap_successes;
+  };
+
+#endif /* __USE_MISC */
+
+__END_DECLS
diff --git a/libc/sysdeps/linux/tile/bits/sigcontextinfo.h b/libc/sysdeps/linux/tile/bits/sigcontextinfo.h
new file mode 100644
index 000000000..b5a857d4f
--- /dev/null
+++ b/libc/sysdeps/linux/tile/bits/sigcontextinfo.h
@@ -0,0 +1,31 @@
+/*
+ * Licensed under the LGPL v2.1 or later, see the file COPYING.LIB
+ * in this tarball.
+ */
+
+/* Copyright (C) 1998, 1999, 2001 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Andreas Schwab <schwab@issan.informatik.uni-dortmund.de>, 1998.
+
+   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.  */
+
+#define SIGCONTEXT int _code, struct sigcontext *
+#define SIGCONTEXT_EXTRA_ARGS _code,
+#define GET_PC(ctx)	((void *) (ctx)->sc_pc)
+#define GET_FRAME(ctx)	((void *) __builtin_frame_address (1))
+#define GET_STACK(ctx)	((void *) (ctx)->sc_usp)
+#define CALL_SIGHANDLER(handler, signo, ctx) \
+  (handler)((signo), SIGCONTEXT_EXTRA_ARGS (ctx))
diff --git a/libc/sysdeps/linux/tile/bits/stackinfo.h b/libc/sysdeps/linux/tile/bits/stackinfo.h
new file mode 100644
index 000000000..a9fd8173b
--- /dev/null
+++ b/libc/sysdeps/linux/tile/bits/stackinfo.h
@@ -0,0 +1,11 @@
+/*
+ * Licensed under the LGPL v2.1 or later, see the file COPYING.LIB
+ * in this tarball.
+ */
+
+#ifndef _STACKINFO_H
+#define _STACKINFO_H	1
+
+#define _STACK_GROWS_DOWN	1
+
+#endif
diff --git a/libc/sysdeps/linux/tile/bits/syscalls.h b/libc/sysdeps/linux/tile/bits/syscalls.h
new file mode 100644
index 000000000..f4447a888
--- /dev/null
+++ b/libc/sysdeps/linux/tile/bits/syscalls.h
@@ -0,0 +1,151 @@
+/* Copyright (C) 2011-2018 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/>.  */
+
+#ifndef _BITS_SYSCALLS_H
+#define _BITS_SYSCALLS_H
+#ifndef _SYSCALL_H
+# error "Never use <bits/syscalls.h> directly; include <sys/syscall.h> instead."
+#endif
+
+/* Define a macro which expands inline into the wrapper code for a system
+   call.  */
+# undef INLINE_SYSCALL
+# define INLINE_SYSCALL(name, nr, args...)                              \
+  ({                                                                    \
+    INTERNAL_SYSCALL_DECL (_sc_err);                                    \
+    unsigned long _sc_val = INTERNAL_SYSCALL (name, _sc_err, nr, args); \
+    if (__builtin_expect (INTERNAL_SYSCALL_ERROR_P (_sc_val, _sc_err), 0)) \
+    {                                                                   \
+      __set_errno (INTERNAL_SYSCALL_ERRNO (_sc_val, _sc_err));          \
+      _sc_val = -1;                                                     \
+    }                                                                   \
+    (long) _sc_val;                                                     \
+  })
+
+#undef INTERNAL_SYSCALL
+#define INTERNAL_SYSCALL(name, err, nr, args...)        \
+  internal_syscall##nr (SYS_ify (name), err, args)
+
+#undef INTERNAL_SYSCALL_NCS
+#define INTERNAL_SYSCALL_NCS(number, err, nr, args...)  \
+  internal_syscall##nr (number, err, args)
+
+#undef INTERNAL_SYSCALL_DECL
+#define INTERNAL_SYSCALL_DECL(err) int err
+
+#undef INTERNAL_SYSCALL_ERROR_P
+#define INTERNAL_SYSCALL_ERROR_P(val, err) ({ (void) (val); (err) != 0; })
+
+#undef INTERNAL_SYSCALL_ERRNO
+#define INTERNAL_SYSCALL_ERRNO(val, err) ({ (void) (val); (err); })
+
+#define internal_syscall0(num, err, dummy...)                           \
+  ({                                                                    \
+    long _sys_result, __SYSCALL_CLOBBER_DECLS;                          \
+    __asm__ __volatile__ (                                              \
+      "swint1"                                                          \
+      : "=R00" (_sys_result), "=R01" (err), __SYSCALL_CLOBBER_OUTPUTS   \
+      : "R10" (num)                                                     \
+      : __SYSCALL_CLOBBERS);                                            \
+    _sys_result;                                                        \
+  })
+
+#define internal_syscall1(num, err, arg0)                               \
+  ({                                                                    \
+    long _sys_result, __SYSCALL_CLOBBER_DECLS;                          \
+    __asm__ __volatile__ (                                              \
+      "swint1"                                                          \
+      : "=R00" (_sys_result), "=R01" (err), __SYSCALL_CLOBBER_OUTPUTS   \
+      : "R10" (num), "R00" (arg0)                                       \
+      : __SYSCALL_CLOBBERS);                                            \
+    _sys_result;                                                        \
+  })
+
+#define internal_syscall2(num, err, arg0, arg1)                         \
+  ({                                                                    \
+    long _sys_result, __SYSCALL_CLOBBER_DECLS;                          \
+    __asm__ __volatile__ (                                              \
+      "swint1"                                                          \
+      : "=R00" (_sys_result), "=R01" (err), __SYSCALL_CLOBBER_OUTPUTS   \
+      : "R10" (num), "R00" (arg0), "R01" (arg1)                         \
+      : __SYSCALL_CLOBBERS);                                            \
+    _sys_result;                                                        \
+  })
+
+#define internal_syscall3(num, err, arg0, arg1, arg2)                   \
+  ({                                                                    \
+    long _sys_result, __SYSCALL_CLOBBER_DECLS;                          \
+    __asm__ __volatile__ (                                              \
+      "swint1"                                                          \
+      : "=R00" (_sys_result), "=R01" (err), __SYSCALL_CLOBBER_OUTPUTS   \
+      : "R10" (num), "R00" (arg0), "R01" (arg1), "R02" (arg2)           \
+      : __SYSCALL_CLOBBERS);                                            \
+    _sys_result;                                                        \
+  })
+
+#define internal_syscall4(num, err, arg0, arg1, arg2, arg3)             \
+  ({                                                                    \
+    long _sys_result, __SYSCALL_CLOBBER_DECLS;                          \
+    __asm__ __volatile__ (                                              \
+      "swint1"                                                          \
+      : "=R00" (_sys_result), "=R01" (err), __SYSCALL_CLOBBER_OUTPUTS   \
+      : "R10" (num), "R00" (arg0), "R01" (arg1), "R02" (arg2),          \
+        "R03" (arg3)                                                    \
+      : __SYSCALL_CLOBBERS);                                            \
+    _sys_result;                                                        \
+  })
+
+#define internal_syscall5(num, err, arg0, arg1, arg2, arg3, arg4)       \
+  ({                                                                    \
+    long _sys_result, __SYSCALL_CLOBBER_DECLS;                          \
+    __asm__ __volatile__ (                                              \
+      "swint1"                                                          \
+      : "=R00" (_sys_result), "=R01" (err), __SYSCALL_CLOBBER_OUTPUTS   \
+      : "R10" (num), "R00" (arg0), "R01" (arg1), "R02" (arg2),          \
+        "R03" (arg3), "R04" (arg4)                                      \
+      : __SYSCALL_CLOBBERS);                                            \
+    _sys_result;                                                        \
+  })
+
+#define internal_syscall6(num, err, arg0, arg1, arg2, arg3, arg4, arg5) \
+  ({                                                                    \
+    long _sys_result, __SYSCALL_CLOBBER_DECLS;                          \
+    __asm__ __volatile__ (                                              \
+      "swint1"                                                          \
+      : "=R00" (_sys_result), "=R01" (err), __SYSCALL_CLOBBER_OUTPUTS   \
+      : "R10" (num), "R00" (arg0), "R01" (arg1), "R02" (arg2),          \
+        "R03" (arg3), "R04" (arg4), "R05" (arg5)                        \
+      : __SYSCALL_CLOBBERS);                                            \
+    _sys_result;                                                        \
+  })
+
+#undef __SYSCALL_CLOBBERS
+#define __SYSCALL_CLOBBERS                                      \
+  "r6",  "r7",                                                  \
+    "r8",  "r9",        "r11", "r12", "r13", "r14", "r15",      \
+    "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23",     \
+    "r24", "r25", "r26", "r27", "r28", "r29", "memory"
+
+/* gcc doesn't seem to allow an input operand to be clobbered, so we
+   fake it with dummy outputs. */
+#define __SYSCALL_CLOBBER_DECLS                                         \
+  _clobber_r2, _clobber_r3, _clobber_r4, _clobber_r5, _clobber_r10
+
+#define __SYSCALL_CLOBBER_OUTPUTS                                       \
+  "=R02" (_clobber_r2), "=R03" (_clobber_r3), "=R04" (_clobber_r4),     \
+    "=R05" (_clobber_r5), "=R10" (_clobber_r10)
+
+#endif
diff --git a/libc/sysdeps/linux/tile/bits/uClibc_arch_features.h b/libc/sysdeps/linux/tile/bits/uClibc_arch_features.h
new file mode 100644
index 000000000..1472b18ab
--- /dev/null
+++ b/libc/sysdeps/linux/tile/bits/uClibc_arch_features.h
@@ -0,0 +1,39 @@
+/*
+ * Track misc arch-specific features that aren't config options
+ */
+
+#ifndef _BITS_UCLIBC_ARCH_FEATURES_H
+#define _BITS_UCLIBC_ARCH_FEATURES_H
+
+#define __UCLIBC_ABORT_INSTRUCTION__ "ill"
+
+/* can your target use syscall6() for mmap ? */
+#undef __UCLIBC_MMAP_HAS_6_ARGS__
+
+#define __UCLIBC_SYSCALL_ALIGN_64BIT__
+
+/* does your target have a broken create_module() ? */
+#define __UCLIBC_BROKEN_CREATE_MODULE__
+
+/* does your target have to worry about older [gs]etrlimit() ? */
+#define __UCLIBC_HANDLE_OLDER_RLIMIT__
+
+/* does your target have an asm .set ? */
+#define __UCLIBC_HAVE_ASM_SET_DIRECTIVE__
+
+/* define if target doesn't like .global */
+#undef __UCLIBC_ASM_GLOBAL_DIRECTIVE__
+
+/* define if target supports .weak */
+#define __UCLIBC_HAVE_ASM_WEAK_DIRECTIVE__
+
+/* define if target supports .weakext */
+#undef __UCLIBC_HAVE_ASM_WEAKEXT_DIRECTIVE__
+
+/* define if target supports IEEE signed zero floats */
+#define __UCLIBC_HAVE_SIGNED_ZERO__
+
+/* define if target supports CFI pseudo ops */
+#define __UCLIBC_HAVE_ASM_CFI_DIRECTIVES__
+
+#endif /* _BITS_UCLIBC_ARCH_FEATURES_H */
diff --git a/libc/sysdeps/linux/tile/bits/wordsize.h b/libc/sysdeps/linux/tile/bits/wordsize.h
new file mode 100644
index 000000000..9dc4da5de
--- /dev/null
+++ b/libc/sysdeps/linux/tile/bits/wordsize.h
@@ -0,0 +1,11 @@
+/* Determine the wordsize from the preprocessor defines.  */
+
+#ifdef __LP64__
+# define __WORDSIZE	64
+# define __WORDSIZE_TIME64_COMPAT32	1
+#else
+# define __WORDSIZE	32
+# define __WORDSIZE_TIME64_COMPAT32	0
+# define __WORDSIZE32_SIZE_ULONG	0
+# define __WORDSIZE32_PTRDIFF_LONG	0
+#endif
diff --git a/libc/sysdeps/linux/tile/clone.S b/libc/sysdeps/linux/tile/clone.S
new file mode 100644
index 000000000..17b9ab1cd
--- /dev/null
+++ b/libc/sysdeps/linux/tile/clone.S
@@ -0,0 +1,173 @@
+/* Copyright (C) 2011-2018 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/>.  */
+
+/* clone() is even more special than fork() as it mucks with stacks
+   and invokes a function in the right context after it's all over.  */
+
+#include <sysdep.h>
+#define _ERRNO_H 1
+#include <bits/errno.h>
+
+#include <asm/unistd.h>
+#include <arch/abi.h>
+#include <linux/sched.h>
+
+/* What we save where in the stack frame; must include all callee-saves. */
+#define FRAME_NEXT_LR   (0 * REGSIZE)  /* reserved by ABI; not used here */
+#define FRAME_SP        (1 * REGSIZE)
+#define FRAME_R30       (2 * REGSIZE)
+#define FRAME_R31       (3 * REGSIZE)
+#define FRAME_R32       (4 * REGSIZE)
+#define FRAME_SIZE      (5 * REGSIZE)
+
+/* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg,
+             pid_t *ptid, struct user_desc *tls, pid_t *ctid); */
+
+	.text
+ENTRY (__clone)
+	/* Create a stack frame so we can pass callee-saves to new task. */
+	{
+	 move r10, sp
+	 st sp, lr
+	 ADDI_PTR sp, sp, -FRAME_SIZE
+	}
+	cfi_offset (lr, 0)
+	cfi_def_cfa_offset (FRAME_SIZE)
+	ADDI_PTR r11, sp, FRAME_SP
+	{
+	 st r11, r10
+	 ADDI_PTR r11, sp, FRAME_R30
+	}
+	{
+	 st r11, r30
+	 ADDI_PTR r11, sp, FRAME_R31
+	}
+	cfi_offset (r30, FRAME_R30 - FRAME_SIZE)
+	{
+	 st r11, r31
+	 ADDI_PTR r11, sp, FRAME_R32
+	}
+	cfi_offset (r31, FRAME_R31 - FRAME_SIZE)
+	st r11, r32
+	cfi_offset (r32, FRAME_R32 - FRAME_SIZE)
+
+	/* sanity check arguments */
+	beqz r0, .Linvalid
+	beqz r1, .Linvalid
+
+	/* Make sure child stack is properly aligned, and set up the
+	   top frame so that we can call out of it immediately in the
+	   child.  Setting it up here means we fault in the parent if
+	   it's bogus, which is probably cleaner than faulting first
+	   thing in the child. */
+	ADDI_PTR r1, r1, -C_ABI_SAVE_AREA_SIZE
+	andi r1, r1, -C_ABI_SAVE_AREA_SIZE
+	ADDI_PTR r9, r1, REGSIZE /* sp of this frame on entry, i.e. zero */
+	st r9, zero
+
+	/* We need to switch the argument convention around from
+	   libc to kernel:
+
+	   libc:
+	    r0 fn
+	    r1 child_stack
+	    r2 flags
+	    r3 arg
+	    r4 ptid
+	    r5 tls
+	    r6 ctid
+
+	   kernel:
+	    r0 flags
+	    r1 child_stack [same as libc]
+	    r2 ptid
+	    r3 ctid
+	    r4 tls
+
+	   Plus the callee-saves as described at .Lthread_start, below.  */
+	{
+	 move r32, r0
+	 move r0, r2
+	}
+	{
+	 move r31, r3
+	 move r3, r6
+	}
+	{
+	 move r30, r2
+	 move r2, r4
+	}
+	{
+	 move r4, r5
+	 moveli TREG_SYSCALL_NR_NAME, __NR_clone
+	}
+	swint1
+	beqz r0, .Lthread_start  /* If in child task.  */
+
+.Ldone:
+	/* Restore the callee-saved registers and return. */
+	ADDLI_PTR lr, sp, FRAME_SIZE
+	{
+	 ld lr, lr
+	 ADDLI_PTR r30, sp, FRAME_R30
+	}
+	{
+	 ld r30, r30
+	 ADDLI_PTR r31, sp, FRAME_R31
+	}
+	{
+	 ld r31, r31
+	 ADDLI_PTR r32, sp, FRAME_R32
+	}
+	{
+	 ld r32, r32
+	 ADDI_PTR sp, sp, FRAME_SIZE
+	}
+	cfi_def_cfa_offset (0)
+
+	bnez r1, .Lerror
+	jrp lr
+
+.Lerror:
+	j SYSCALL_ERROR_NAME
+
+.Linvalid:
+	{
+	 movei r1, EINVAL
+	 j .Ldone
+	}
+
+/* This function expects to receive:
+
+   sp: the top of a valid stack area
+   r30: clone() flags
+   r31: the argument to pass to the user function
+   r32: the user function pointer  */
+
+.Lthread_start:
+	cfi_def_cfa_offset (FRAME_SIZE)
+	cfi_undefined (lr)
+	{
+	 /* Invoke user function with specified argument. */
+	 move r0, r31
+	 jalr r32
+	}
+	moveli TREG_SYSCALL_NR_NAME, __NR_exit
+	swint1
+PSEUDO_END (__clone)
+
+libc_hidden_def (clone)
+weak_alias (__clone, clone)
diff --git a/libc/sysdeps/linux/tile/crt1.S b/libc/sysdeps/linux/tile/crt1.S
new file mode 100644
index 000000000..4a7c1d76d
--- /dev/null
+++ b/libc/sysdeps/linux/tile/crt1.S
@@ -0,0 +1,182 @@
+/* Copyright (C) 2011-2018 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.
+
+   In addition to the permissions in the GNU Lesser General Public
+   License, the Free Software Foundation gives you unlimited
+   permission to link the compiled version of this file with other
+   programs, and to distribute those programs without any restriction
+   coming from the use of this file. (The GNU Lesser General Public
+   License restrictions do apply in other respects; for example, they
+   cover modification of the file, and distribution when not linked
+   into another program.)
+
+   Note that people who make modified versions of this file are not
+   obligated to grant this special exception for their modified
+   versions; it is their choice whether to do so. The GNU Lesser
+   General Public License gives permission to release a modified
+   version without this exception; this exception also makes it
+   possible to release a modified version which carries forward this
+   exception.
+
+   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/>.  */
+
+/* This is the canonical entry point, usually the first thing in the text
+   segment.  The ELF standard tells us that the stack is set up like this on
+   entry (the left side is the offset from "sp"), in units of
+   __SIZEOF_POINTER__ entries:
+
+		+0		argc
+		+1		argv[0]
+		...
+		+(argc+1)	NULL
+		+(argc+2)	envp[0]
+		...
+				NULL
+		...		ElfInfo
+
+   The ElfInfo is pairs of key/value long words following the envp
+   pointers and terminated by a zero-valued key.
+
+   Although not mandated by the standard, it happens to be the case
+   that we store the actual argv and envp strings immediately after
+   the ElfInfo data on the stack.
+
+   On entry r0 points to the shared library termination function, or 0
+   if there isn't one.
+*/
+
+#include <features.h>
+#include <sysdep.h>
+#include <arch/abi.h>
+
+/* Just create no-ops if we don't support PC-relative PLT relocations. */
+#ifdef NO_PLT_PCREL
+# define hw2_last_plt(x)	0
+# define hw1_plt(x)		0
+# define hw0_plt(x)		0
+#endif
+
+	.text
+	.global _start
+	.type   _start,@function
+	.align 8
+_start:
+	/* Linux starts us with sp pointing at the conventional Elf layout,
+	   but we need to allow two "caller" words for our ABI convention.  */
+	{
+	 /* Load argc (stored as a "long", equivalent to a pointer type). */
+	 LD_PTR r1, sp
+
+	 /* Save incoming 'sp', which points to the Elf argument block. */
+	 move r52, sp
+	}
+
+	{
+	 /* Allocate stack frame callee space for __libc_start_main. */
+	 ADDI_PTR r12, sp, -(2 * REGSIZE)
+	}
+
+	{
+	 /* Get our PC. */
+	 lnk r13
+
+	 /* sp is not necessarily properly aligned on startup because
+	    of the way ld.so pops off leading argv elements. So align it. */
+	 andi sp, r12, -8
+	}
+.Lmy_pc:
+
+	{
+	 /* Pass the address of the shared library termination function. */
+	 move r5, r0
+
+	 /* Compute location where __libc_start_main's caller is supposed to
+	    store its frame pointer. */
+	 ADDI_PTR r12, sp, REGSIZE
+
+	 /* Zero out callee space for return address. Unnecessary but free.
+	    This is just paranoia to help backtracing not go awry. */
+	 st sp, zero
+	}
+	{
+	 /* Zero out our frame pointer for __libc_start_main. */
+	 st r12, zero
+
+	 /* Zero out lr to make __libc_start_main the end of backtrace.  */
+	 move lr, zero
+
+	 /* Compute a pointer to argv. envp will be determined
+	    later in __libc_start_main.  We set up the first argument
+	    (the address of main) below. */
+	 ADDI_PTR r2, r52, __SIZEOF_POINTER__
+	}
+	{
+	 /* Pass the highest stack address to user code. */
+	 ADDI_PTR r6, sp, (2 * REGSIZE)
+
+	 /* Pass address of main() in r0, and of our own entry
+	    points to .fini and .init in r3 and r4.  */
+	 moveli r0, hw2_last(main - .Lmy_pc)
+	}
+	{
+	 shl16insli r0, r0, hw1(main - .Lmy_pc)
+	 moveli r3, hw2_last(_init - .Lmy_pc)
+	}
+	{
+	 shl16insli r0, r0, hw0(main - .Lmy_pc)
+	 shl16insli r3, r3, hw1(_init - .Lmy_pc)
+	}
+	{
+	 ADD_PTR r0, r0, r13
+	 shl16insli r3, r3, hw0(_init - .Lmy_pc)
+	}
+	{
+	 moveli r12, hw2_last_plt(__uClibc_main - .Lmy_pc)
+	 ADD_PTR r3, r3, r13
+	}
+	{
+	 shl16insli r12, r12, hw1_plt(__uClibc_main - .Lmy_pc)
+	 moveli r4, hw2_last(_fini - .Lmy_pc)
+	}
+	{
+	 shl16insli r12, r12, hw0_plt(__uClibc_main - .Lmy_pc)
+	 shl16insli r4, r4, hw1(_fini - .Lmy_pc)
+	}
+	{
+	 ADD_PTR r12, r12, r13
+	 shl16insli r4, r4, hw0(_fini - .Lmy_pc)
+	}
+	{
+	 ADD_PTR r4, r4, r13
+#ifdef NO_PLT_PCREL
+	 j plt(__uClibc_main)
+#else
+	 jr r12
+#endif
+	}
+
+	{
+	 /* Tell backtracer to give up (_start has no caller). */
+	 info INFO_OP_CANNOT_BACKTRACE
+	}
+.size _start, .-_start
+
+/* Define a symbol for the first piece of initialized data.  */
+	.data
+	.global __data_start
+	.align 8
+__data_start:
+	.long 0
+	.weak data_start
+	data_start = __data_start
diff --git a/libc/sysdeps/linux/tile/crti.S b/libc/sysdeps/linux/tile/crti.S
new file mode 100644
index 000000000..e355cca29
--- /dev/null
+++ b/libc/sysdeps/linux/tile/crti.S
@@ -0,0 +1,68 @@
+/* Special .init and .fini section support for tile.
+   Copyright (C) 2012-2018 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.
+
+   In addition to the permissions in the GNU Lesser General Public
+   License, the Free Software Foundation gives you unlimited
+   permission to link the compiled version of this file with other
+   programs, and to distribute those programs without any restriction
+   coming from the use of this file. (The GNU Lesser General Public
+   License restrictions do apply in other respects; for example, they
+   cover modification of the file, and distribution when not linked
+   into another program.)
+
+   Note that people who make modified versions of this file are not
+   obligated to grant this special exception for their modified
+   versions; it is their choice whether to do so. The GNU Lesser
+   General Public License gives permission to release a modified
+   version without this exception; this exception also makes it
+   possible to release a modified version which carries forward this
+   exception.
+
+   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/>.  */
+
+/* crti.S puts a function prologue at the beginning of the .init and
+   .fini sections and defines global symbols for those addresses, so
+   they can be called as functions.  The symbols _init and _fini are
+   magic and cause the linker to emit DT_INIT and DT_FINI.  */
+
+#include <sysdep.h>
+
+
+	.section .init,"ax",@progbits
+	.align 8
+	.globl _init
+	.type _init, @function
+_init:
+	{
+	 move r29, sp
+	 ADDI_PTR r28, sp, -REGSIZE
+	 st sp, lr
+	}
+	ADDI_PTR sp, sp, -(2 * REGSIZE)
+	st r28, r29
+.Lno_weak_fn:
+
+	.section .fini,"ax",@progbits
+	.align 8
+	.globl _fini
+	.type _fini, @function
+_fini:
+	{
+	 move r29, sp
+	 ADDI_PTR r28, sp, -REGSIZE
+	 st sp, lr
+	}
+	ADDI_PTR sp, sp, -(2 * REGSIZE)
+	st r28, r29
diff --git a/libc/sysdeps/linux/tile/crtn.S b/libc/sysdeps/linux/tile/crtn.S
new file mode 100644
index 000000000..a5e743977
--- /dev/null
+++ b/libc/sysdeps/linux/tile/crtn.S
@@ -0,0 +1,54 @@
+/* Special .init and .fini section support for tile.
+   Copyright (C) 2012-2018 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.
+
+   In addition to the permissions in the GNU Lesser General Public
+   License, the Free Software Foundation gives you unlimited
+   permission to link the compiled version of this file with other
+   programs, and to distribute those programs without any restriction
+   coming from the use of this file. (The GNU Lesser General Public
+   License restrictions do apply in other respects; for example, they
+   cover modification of the file, and distribution when not linked
+   into another program.)
+
+   Note that people who make modified versions of this file are not
+   obligated to grant this special exception for their modified
+   versions; it is their choice whether to do so. The GNU Lesser
+   General Public License gives permission to release a modified
+   version without this exception; this exception also makes it
+   possible to release a modified version which carries forward this
+   exception.
+
+   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/>.  */
+
+/* crtn.S puts function epilogues in the .init and .fini sections
+   corresponding to the prologues in crti.S. */
+
+#include <sysdep.h>
+
+	.section .init,"ax",@progbits
+	ADDI_PTR r29, sp, (2 * REGSIZE)
+	{
+	 ADDI_PTR sp, sp, (2 * REGSIZE)
+	 ld lr, r29
+	}
+	jrp lr
+
+	.section .fini,"ax",@progbits
+	ADDI_PTR r29, sp, (2 * REGSIZE)
+	{
+	 ADDI_PTR sp, sp, (2 * REGSIZE)
+	 ld lr, r29
+	}
+	jrp lr
diff --git a/libc/sysdeps/linux/tile/jmpbuf-offsets.h b/libc/sysdeps/linux/tile/jmpbuf-offsets.h
new file mode 100644
index 000000000..f0bf47058
--- /dev/null
+++ b/libc/sysdeps/linux/tile/jmpbuf-offsets.h
@@ -0,0 +1,60 @@
+/* Copyright (C) 2011-2018 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/>.  */
+
+/* We don't use most of these symbols; they are here for documentation. */
+#define JB_R30  0
+#define JB_R31  1
+#define JB_R32  2
+#define JB_R33  3
+#define JB_R34  4
+#define JB_R35  5
+#define JB_R36  6
+#define JB_R37  7
+#define JB_R38  8
+#define JB_R39  9
+#define JB_R40  10
+#define JB_R41  11
+#define JB_R42  12
+#define JB_R43  13
+#define JB_R44  14
+#define JB_R45  15
+#define JB_R46  16
+#define JB_R47  17
+#define JB_R48  18
+#define JB_R49  19
+#define JB_R50  20
+#define JB_R51  21
+#define JB_FP   22  /* r52 */
+#define JB_TP   23  /* r53 */
+#define JB_SP   24  /* r54 */
+#define JB_PC   25  /* normally LR, r55 */
+#define JB_ICS  26  /* interrupt critical section bit */
+
+/* We save space for some extra state to accommodate future changes.  */
+#define JB_LEN  32  /* number of words */
+
+#define JB_SIZE (JB_LEN * REGSIZE)
+
+/* Helper macro used by all the setjmp/longjmp assembly code. */
+#define FOR_EACH_CALLEE_SAVED_REG(f)                              \
+  .no_require_canonical_reg_names;                f(r30); f(r31); \
+  f(r32); f(r33); f(r34); f(r35); f(r36); f(r37); f(r38); f(r39); \
+  f(r40); f(r41); f(r42); f(r43); f(r44); f(r45); f(r46); f(r47); \
+  f(r48); f(r49); f(r50); f(r51); f(r52); f(r53); f(r54); f(r55)
+
+/* Helper for generic ____longjmp_chk(). */
+#define JB_FRAME_ADDRESS(buf) \
+  ((void *) (unsigned long) (buf[JB_SP]))
diff --git a/libc/sysdeps/linux/tile/jmpbuf-unwind.h b/libc/sysdeps/linux/tile/jmpbuf-unwind.h
new file mode 100644
index 000000000..2503c31ec
--- /dev/null
+++ b/libc/sysdeps/linux/tile/jmpbuf-unwind.h
@@ -0,0 +1,42 @@
+/* Copyright (C) 2011-2018 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 <setjmp.h>
+#include <jmpbuf-offsets.h>
+#include <stdint.h>
+#include <unwind.h>
+#include <sysdep.h>
+
+/* Test if longjmp to JMPBUF would unwind the frame
+   containing a local variable at ADDRESS.  */
+#define _JMPBUF_UNWINDS(jmpbuf, address, demangle) \
+  ((void *) (address) < (void *) demangle ((jmpbuf)[JB_SP]))
+
+#define _JMPBUF_CFA_UNWINDS_ADJ(_jmpbuf, _context, _adj) \
+  _JMPBUF_UNWINDS_ADJ (_jmpbuf, (void *) (long) _Unwind_GetCFA (_context), _adj)
+
+static inline uintptr_t __attribute__ ((unused))
+_jmpbuf_sp (__jmp_buf regs)
+{
+  uintptr_t sp = regs[JB_SP];
+  return sp;
+}
+
+#define _JMPBUF_UNWINDS_ADJ(_jmpbuf, _address, _adj) \
+  ((uintptr_t) (_address) - (_adj) < _jmpbuf_sp (_jmpbuf) - (_adj))
+
+/* We use the normal longjmp for unwinding.  */
+#define __libc_unwind_longjmp(buf, val) __libc_longjmp (buf, val)
diff --git a/libc/sysdeps/linux/tile/setjmp.S b/libc/sysdeps/linux/tile/setjmp.S
new file mode 100644
index 000000000..86bdacbdb
--- /dev/null
+++ b/libc/sysdeps/linux/tile/setjmp.S
@@ -0,0 +1,44 @@
+/* Copyright (C) 2011-2018 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>
+#include <jmpbuf-offsets.h>
+
+	.text
+
+	/* Keep traditional entry points in with sigsetjmp(). */
+ENTRY(setjmp)
+	{ movei r1, 1; j 1f }
+END(setjmp)
+
+ENTRY(_setjmp)
+	{ movei r1, 0; j 1f }
+END(_setjmp)
+libc_hidden_def (_setjmp)
+
+ENTRY(__sigsetjmp)
+1:
+	move r2, r0
+
+#define SAVE(r) { st r2, r ; ADDI_PTR r2, r2, REGSIZE }
+	FOR_EACH_CALLEE_SAVED_REG(SAVE)
+
+	mfspr r3, INTERRUPT_CRITICAL_SECTION
+	st r2, r3
+	j plt(__sigjmp_save)
+	jrp lr   /* Keep the backtracer happy. */
+END(__sigsetjmp)
+hidden_def (__sigsetjmp)
diff --git a/libc/sysdeps/linux/tile/sys/cachectl.h b/libc/sysdeps/linux/tile/sys/cachectl.h
new file mode 100644
index 000000000..14ce52f47
--- /dev/null
+++ b/libc/sysdeps/linux/tile/sys/cachectl.h
@@ -0,0 +1,34 @@
+/* Copyright (C) 2011-2018 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/>.  */
+
+#ifndef _SYS_CACHECTL_H
+#define _SYS_CACHECTL_H 1
+
+#include <features.h>
+
+/* Get the kernel definition for the op bits.  */
+#include <asm/cachectl.h>
+
+__BEGIN_DECLS
+
+#ifdef __USE_MISC
+extern int cacheflush (void *__addr, const int __nbytes, const int __op) __THROW;
+#endif
+extern int _flush_cache (char *__addr, const int __nbytes, const int __op) __THROW;
+
+__END_DECLS
+
+#endif /* sys/cachectl.h */
diff --git a/libc/sysdeps/linux/tile/sys/procfs.h b/libc/sysdeps/linux/tile/sys/procfs.h
new file mode 100644
index 000000000..8af94bab7
--- /dev/null
+++ b/libc/sysdeps/linux/tile/sys/procfs.h
@@ -0,0 +1,126 @@
+/* Copyright (C) 2011-2018 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/>.  */
+
+#ifndef _SYS_PROCFS_H
+#define _SYS_PROCFS_H	1
+
+/* This is somewhat modelled after the file of the same name on SVR4
+   systems.  It provides a definition of the core file format for ELF
+   used on Linux.  It doesn't have anything to do with the /proc file
+   system, even though Linux has one.
+
+   Anyway, the whole purpose of this file is for GDB and GDB only.
+   Don't read too much into it.  Don't use it for anything other than
+   GDB unless you know what you are doing.  */
+
+#include <features.h>
+#include <sys/time.h>
+#include <sys/types.h>
+
+#define __need_int_reg_t
+#include <arch/abi.h>
+
+__BEGIN_DECLS
+
+/* Type for a general-purpose register.  */
+typedef __uint_reg_t elf_greg_t;
+
+/* And the whole bunch of them.  We could have used `struct pt_regs'
+   from <asm/ptrace.h> directly in the typedef, but tradition says that
+   the register set is an array, which does have some peculiar
+   semantics, so leave it that way.  */
+#define ELF_NGREG  64
+#define ELF_NFPREG 0
+typedef elf_greg_t elf_gregset_t[ELF_NGREG];
+typedef elf_greg_t elf_fpregset_t[ELF_NFPREG];
+
+/* Signal info.  */
+struct elf_siginfo
+  {
+    int si_signo;			/* Signal number.  */
+    int si_code;			/* Extra code.  */
+    int si_errno;			/* Errno.  */
+  };
+
+
+/* Definitions to generate Intel SVR4-like core files.  These mostly
+   have the same names as the SVR4 types with "elf_" tacked on the
+   front to prevent clashes with Linux definitions, and the typedef
+   forms have been avoided.  This is mostly like the SVR4 structure,
+   but more Linuxy, with things that Linux does not support and which
+   GDB doesn't really use excluded.  */
+
+struct elf_prstatus
+  {
+    struct elf_siginfo pr_info;		/* Info associated with signal.  */
+    short int pr_cursig;		/* Current signal.  */
+    unsigned long int pr_sigpend;	/* Set of pending signals.  */
+    unsigned long int pr_sighold;	/* Set of held signals.  */
+    __pid_t pr_pid;
+    __pid_t pr_ppid;
+    __pid_t pr_pgrp;
+    __pid_t pr_sid;
+    struct timeval pr_utime;		/* User time.  */
+    struct timeval pr_stime;		/* System time.  */
+    struct timeval pr_cutime;		/* Cumulative user time.  */
+    struct timeval pr_cstime;		/* Cumulative system time.  */
+    elf_gregset_t pr_reg;		/* GP registers.  */
+    int pr_fpvalid;			/* True if math copro being used.  */
+  };
+
+
+#define ELF_PRARGSZ     (80)    /* Number of chars for args.  */
+
+struct elf_prpsinfo
+  {
+    char pr_state;			/* Numeric process state.  */
+    char pr_sname;			/* Char for pr_state.  */
+    char pr_zomb;			/* Zombie.  */
+    char pr_nice;			/* Nice val.  */
+    unsigned long int pr_flag;		/* Flags.  */
+    unsigned int pr_uid;
+    unsigned int pr_gid;
+    int pr_pid, pr_ppid, pr_pgrp, pr_sid;
+    /* Lots missing */
+    char pr_fname[16];			/* Filename of executable.  */
+    char pr_psargs[ELF_PRARGSZ];	/* Initial part of arg list.  */
+  };
+
+
+/* The rest of this file provides the types for emulation of the
+   Solaris <proc_service.h> interfaces that should be implemented by
+   users of libthread_db.  */
+
+/* Addresses.  */
+typedef void *psaddr_t;
+
+/* Register sets.  Linux has different names.  */
+typedef elf_gregset_t prgregset_t;
+
+/* Provide dummy declaration here; we don't have FP registers. */
+typedef elf_fpregset_t prfpregset_t;
+
+/* We don't have any differences between processes and threads,
+   therefore have only one PID type.  */
+typedef __pid_t lwpid_t;
+
+/* Process status and info.  In the end we do provide typedefs for them.  */
+typedef struct elf_prstatus prstatus_t;
+typedef struct elf_prpsinfo prpsinfo_t;
+
+__END_DECLS
+
+#endif	/* sys/procfs.h */
diff --git a/libc/sysdeps/linux/tile/sys/ptrace.h b/libc/sysdeps/linux/tile/sys/ptrace.h
new file mode 100644
index 000000000..94fe60f6f
--- /dev/null
+++ b/libc/sysdeps/linux/tile/sys/ptrace.h
@@ -0,0 +1,198 @@
+/* `ptrace' debugger support interface.  Linux/Tile version.
+   Copyright (C) 2011-2018 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/>.  */
+
+#ifndef _SYS_PTRACE_H
+#define _SYS_PTRACE_H	1
+
+#include <features.h>
+#include <bits/types.h>
+
+__BEGIN_DECLS
+
+/* Type of the REQUEST argument to `ptrace.'  */
+enum __ptrace_request
+{
+  /* Indicate that the process making this request should be traced.
+     All signals received by this process can be intercepted by its
+     parent, and its parent can use the other `ptrace' requests.  */
+  PTRACE_TRACEME = 0,
+#define PT_TRACE_ME PTRACE_TRACEME
+
+  /* Return the word in the process's text space at address ADDR.  */
+  PTRACE_PEEKTEXT = 1,
+#define PT_READ_I PTRACE_PEEKTEXT
+
+  /* Return the word in the process's data space at address ADDR.  */
+  PTRACE_PEEKDATA = 2,
+#define PT_READ_D PTRACE_PEEKDATA
+
+  /* Return the word in the process's user area at offset ADDR.  */
+  PTRACE_PEEKUSER = 3,
+#define PT_READ_U PTRACE_PEEKUSER
+
+  /* Write the word DATA into the process's text space at address ADDR.  */
+  PTRACE_POKETEXT = 4,
+#define PT_WRITE_I PTRACE_POKETEXT
+
+  /* Write the word DATA into the process's data space at address ADDR.  */
+  PTRACE_POKEDATA = 5,
+#define PT_WRITE_D PTRACE_POKEDATA
+
+  /* Write the word DATA into the process's user area at offset ADDR.  */
+  PTRACE_POKEUSER = 6,
+#define PT_WRITE_U PTRACE_POKEUSER
+
+  /* Continue the process.  */
+  PTRACE_CONT = 7,
+#define PT_CONTINUE PTRACE_CONT
+
+  /* Kill the process.  */
+  PTRACE_KILL = 8,
+#define PT_KILL PTRACE_KILL
+
+  /* Single step the process.  */
+  PTRACE_SINGLESTEP = 9,
+#define PT_STEP PTRACE_SINGLESTEP
+
+  /* Get all general purpose registers used by a processes. */
+   PTRACE_GETREGS = 12,
+#define PT_GETREGS PTRACE_GETREGS
+
+  /* Set all general purpose registers used by a processes. */
+   PTRACE_SETREGS = 13,
+#define PT_SETREGS PTRACE_SETREGS
+
+  /* Attach to a process that is already running. */
+  PTRACE_ATTACH = 16,
+#define PT_ATTACH PTRACE_ATTACH
+
+  /* Detach from a process attached to with PTRACE_ATTACH.  */
+  PTRACE_DETACH = 17,
+#define PT_DETACH PTRACE_DETACH
+
+  /* Continue and stop at the next entry to or return from syscall.  */
+  PTRACE_SYSCALL = 24,
+#define PT_SYSCALL PTRACE_SYSCALL
+
+  /* Set ptrace filter options.  */
+  PTRACE_SETOPTIONS = 0x4200,
+#define PT_SETOPTIONS PTRACE_SETOPTIONS
+
+  /* Get last ptrace message.  */
+  PTRACE_GETEVENTMSG = 0x4201,
+#define PT_GETEVENTMSG PTRACE_GETEVENTMSG
+
+  /* Get siginfo for process.  */
+  PTRACE_GETSIGINFO = 0x4202,
+#define PT_GETSIGINFO PTRACE_GETSIGINFO
+
+  /* Set new siginfo for process.  */
+  PTRACE_SETSIGINFO = 0x4203,
+#define PT_SETSIGINFO PTRACE_SETSIGINFO
+
+  /* Set register content.  */
+  PTRACE_SETREGSET = 0x4205,
+#define PTRACE_SETREGSET PTRACE_SETREGSET
+
+  /* Like PTRACE_ATTACH, but do not force tracee to trap and do not affect
+     signal or group stop state.  */
+  PTRACE_SEIZE = 0x4206,
+#define PTRACE_SEIZE PTRACE_SEIZE
+
+  /* Trap seized tracee.  */
+  PTRACE_INTERRUPT = 0x4207,
+#define PTRACE_INTERRUPT PTRACE_INTERRUPT
+
+  /* Wait for next group event.  */
+  PTRACE_LISTEN = 0x4208,
+#define PTRACE_LISTEN PTRACE_LISTEN
+
+  /* Retrieve siginfo_t structures without removing signals from a queue.  */
+  PTRACE_PEEKSIGINFO = 0x4209,
+#define PTRACE_PEEKSIGINFO PTRACE_PEEKSIGINFO
+
+  /* Get the mask of blocked signals.  */
+  PTRACE_GETSIGMASK = 0x420a,
+#define PTRACE_GETSIGMASK PTRACE_GETSIGMASK
+
+  /* Change the mask of blocked signals.  */
+  PTRACE_SETSIGMASK = 0x420b,
+#define PTRACE_SETSIGMASK PTRACE_SETSIGMASK
+
+  /* Get seccomp BPF filters.  */
+  PTRACE_SECCOMP_GET_FILTER = 0x420c
+#define PTRACE_SECCOMP_GET_FILTER PTRACE_SECCOMP_GET_FILTER
+};
+
+/* Options set using PTRACE_SETOPTIONS.  */
+enum __ptrace_setoptions
+{
+  PTRACE_O_TRACESYSGOOD	= 0x00000001,
+  PTRACE_O_TRACEFORK	= 0x00000002,
+  PTRACE_O_TRACEVFORK	= 0x00000004,
+  PTRACE_O_TRACECLONE	= 0x00000008,
+  PTRACE_O_TRACEEXEC	= 0x00000010,
+  PTRACE_O_TRACEVFORKDONE = 0x00000020,
+  PTRACE_O_TRACEEXIT	= 0x00000040,
+  PTRACE_O_TRACESECCOMP	= 0x00000080,
+  PTRACE_O_EXITKILL	= 0x00100000,
+  PTRACE_O_SUSPEND_SECCOMP = 0x00200000,
+  PTRACE_O_MASK		= 0x003000ff
+};
+
+enum __ptrace_eventcodes
+{
+/* Wait extended result codes for the above trace options.  */
+  PTRACE_EVENT_FORK	= 1,
+  PTRACE_EVENT_VFORK	= 2,
+  PTRACE_EVENT_CLONE	= 3,
+  PTRACE_EVENT_EXEC	= 4,
+  PTRACE_EVENT_VFORK_DONE = 5,
+  PTRACE_EVENT_EXIT	= 6,
+  PTRACE_EVENT_SECCOMP  = 7,
+/* Extended result codes enabled by means other than options.  */
+  PTRACE_EVENT_STOP	= 128
+};
+
+/* Arguments for PTRACE_PEEKSIGINFO.  */
+struct __ptrace_peeksiginfo_args
+{
+  __uint64_t off;	/* From which siginfo to start.  */
+  __uint32_t flags;	/* Flags for peeksiginfo.  */
+  __int32_t nr;		/* How many siginfos to take.  */
+};
+
+enum __ptrace_peeksiginfo_flags
+{
+  /* Read signals from a shared (process wide) queue.  */
+  PTRACE_PEEKSIGINFO_SHARED = (1 << 0)
+};
+
+/* Perform process tracing functions.  REQUEST is one of the values
+   above, and determines the action to be taken.
+   For all requests except PTRACE_TRACEME, PID specifies the process to be
+   traced.
+
+   PID and the other arguments described above for the various requests should
+   appear (those that are used for the particular request) as:
+     pid_t PID, void *ADDR, int DATA, void *ADDR2
+   after REQUEST.  */
+extern long int ptrace (enum __ptrace_request __request, ...) __THROW;
+
+__END_DECLS
+
+#endif /* _SYS_PTRACE_H */
diff --git a/libc/sysdeps/linux/tile/sys/reg.h b/libc/sysdeps/linux/tile/sys/reg.h
new file mode 100644
index 000000000..1ab17ce82
--- /dev/null
+++ b/libc/sysdeps/linux/tile/sys/reg.h
@@ -0,0 +1,2 @@
+/* The traditional purpose of "sys/reg.h" is satisfied by "arch/abi.h". */
+#include <arch/abi.h>
diff --git a/libc/sysdeps/linux/tile/sys/ucontext.h b/libc/sysdeps/linux/tile/sys/ucontext.h
new file mode 100644
index 000000000..ed2c27b58
--- /dev/null
+++ b/libc/sysdeps/linux/tile/sys/ucontext.h
@@ -0,0 +1,96 @@
+/* Copyright (C) 2011-2018 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/>.  */
+
+#ifndef _SYS_UCONTEXT_H
+#define _SYS_UCONTEXT_H	1
+
+#include <features.h>
+#include <signal.h>
+#include <bits/sigcontext.h>
+
+#ifdef __USE_MISC
+# define __ctx(fld) fld
+#else
+# define __ctx(fld) __ ## fld
+#endif
+
+#ifdef __USE_MISC
+/* Get register type and register names. */
+# include <arch/abi.h>
+
+
+/* Type for general register.  */
+typedef uint_reg_t greg_t;
+
+/* Number of general registers.  Must agree with <asm/ptrace.h>. */
+# define NGREG	64
+
+/* Container for all general registers.  */
+typedef greg_t gregset_t[NGREG];
+#endif
+
+#ifdef __USE_GNU
+/* Names for interesting registers in the `gregset_t' array.  */
+enum
+{
+  /* ... r0 through r51 are just 0 through 51 ... */
+  REG_FP = TREG_FP,
+# define REG_FP		REG_FP
+  REG_TP = TREG_TP,
+# define REG_TP		REG_TP
+  REG_SP = TREG_SP,
+# define REG_SP		REG_SP
+  REG_LR = TREG_LR,
+# define REG_LR		REG_LR
+};
+#endif
+
+#define __need_int_reg_t
+#include <arch/abi.h>
+
+/* A machine context is exactly a sigcontext.  */
+typedef struct
+  {
+    __extension__ union
+      {
+	__uint_reg_t __ctx(gregs)[56];
+	__extension__ struct
+	  {
+	    __uint_reg_t __ctx(__gregs)[53];
+	    __uint_reg_t __ctx(tp);
+	    __uint_reg_t __ctx(sp);
+	    __uint_reg_t __ctx(lr);
+	  };
+      };
+    __uint_reg_t __ctx(pc);
+    __uint_reg_t __ctx(ics);
+    __uint_reg_t __ctx(faultnum);
+    __uint_reg_t __glibc_reserved1[5];
+  } mcontext_t;
+
+/* Userlevel context.  */
+typedef struct ucontext_t
+  {
+    unsigned long int __ctx(uc_flags);
+    struct ucontext_t *uc_link;
+    stack_t uc_stack;
+    mcontext_t uc_mcontext;
+    sigset_t uc_sigmask;
+  } ucontext_t;
+
+#undef __ctx
+
+#endif /* sys/ucontext.h */
diff --git a/libc/sysdeps/linux/tile/sys/user.h b/libc/sysdeps/linux/tile/sys/user.h
new file mode 100644
index 000000000..c871f1a03
--- /dev/null
+++ b/libc/sysdeps/linux/tile/sys/user.h
@@ -0,0 +1 @@
+/* This file is not needed, but in practice gdb might try to include it.  */
diff --git a/libc/sysdeps/linux/tile/sysdep.h b/libc/sysdeps/linux/tile/sysdep.h
new file mode 100644
index 000000000..b9231d7ef
--- /dev/null
+++ b/libc/sysdeps/linux/tile/sysdep.h
@@ -0,0 +1,118 @@
+/* Copyright (C) 2011-2018 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 <common/sysdep.h>
+#include <bits/wordsize.h>
+#include <arch/abi.h>
+
+#undef SYS_ify
+#define SYS_ify(syscall_name)	__NR_##syscall_name
+
+#if defined __ASSEMBLER__
+
+/* Make use of .size directive.  */
+#define ASM_SIZE_DIRECTIVE(name) .size name,.-name;
+
+/* Define an entry point visible from C.  */
+#define	ENTRY(name)							      \
+  .globl C_SYMBOL_NAME(name);						      \
+  .type C_SYMBOL_NAME(name),@function;					      \
+  .align 8;								      \
+  C_LABEL(name)								      \
+  cfi_startproc;							      \
+
+#undef	END
+#define END(name)							      \
+  cfi_endproc;								      \
+  ASM_SIZE_DIRECTIVE(name)
+
+/* Since C identifiers are not normally prefixed with an underscore
+   on this system, the asm identifier `syscall_error' intrudes on the
+   C name space.  Make sure we use an innocuous name.  */
+#define	syscall_error	__syscall_error
+
+/* Local label name for asm code. */
+#define L(name)		.L##name
+
+/* Specify the size in bytes of a machine register.  */
+#define REGSIZE		8
+
+/* Provide "pointer-oriented" instruction variants.  These differ not
+   just for tilepro vs tilegx, but also for tilegx -m64 vs -m32.  */
+#if __WORDSIZE == 32
+#define ADD_PTR		addx
+#define ADDI_PTR	addxi
+#define ADDLI_PTR	addxli
+#define LD_PTR		ld4s
+#define ST_PTR		st4
+#define SHL_PTR_ADD	shl2add
+#else
+#define ADD_PTR		add
+#define ADDI_PTR	addi
+#define ADDLI_PTR	addli
+#define LD_PTR		LD
+#define ST_PTR		ST
+#define SHL_PTR_ADD	shl3add
+#endif
+
+/* The actual implementation of doing a syscall. */
+#define DO_CALL(syscall_name, args)                     \
+  moveli TREG_SYSCALL_NR_NAME, SYS_ify(syscall_name);	\
+  swint1
+
+/* TILE Linux returns the result in r0 (or a negative errno).
+   The kernel "owns" the code to decide if a given value is an error,
+   and puts errno in r1 if so, or otherwise zero.  */
+#define	PSEUDO(name, syscall_name, args)		\
+  ENTRY	(name);						\
+  DO_CALL(syscall_name, args);				\
+  BNEZ r1, 0f
+
+#define ret  jrp lr
+
+#ifndef SHARED
+/* For static code, on error jump to __syscall_error directly. */
+# define SYSCALL_ERROR_NAME __syscall_error
+#elif IS_IN_libc || IS_IN_libpthread
+/* Use the internal name for libc/libpthread shared objects. */
+# define SYSCALL_ERROR_NAME __GI___syscall_error
+#else
+/* Otherwise, on error do a full PLT jump. */
+# define SYSCALL_ERROR_NAME plt(__syscall_error)
+#endif
+
+#undef PSEUDO_END
+#define	PSEUDO_END(name)				\
+0:							\
+  j SYSCALL_ERROR_NAME;					\
+  END (name)
+
+#undef PSEUDO_NOERRNO
+#define	PSEUDO_NOERRNO(name, syscall_name, args)	\
+  ENTRY	(name);						\
+  DO_CALL(syscall_name, args)
+
+#define ret_NOERRNO  jrp lr
+
+#undef PSEUDO_END_NOERRNO
+#define	PSEUDO_END_NOERRNO(name) \
+  END (name)
+
+/* Convenience wrappers. */
+#define SYSCALL__(name, args)   PSEUDO (__##name, name, args)
+#define SYSCALL(name, args)   PSEUDO (name, name, args)
+
+#endif /* __ASSEMBLER__ */
diff --git a/libc/sysdeps/linux/tile/vfork.S b/libc/sysdeps/linux/tile/vfork.S
new file mode 100644
index 000000000..ab104a0c1
--- /dev/null
+++ b/libc/sysdeps/linux/tile/vfork.S
@@ -0,0 +1,45 @@
+/* Copyright (C) 2011-2018 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 __ASSEMBLY__  /* for kernel headers */
+#include <linux/sched.h>
+#include <asm/signal.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.  */
+
+	.text
+ENTRY (__vfork)
+	{
+	 moveli r0, CLONE_VFORK | CLONE_VM | SIGCHLD
+	 move r1, zero
+	}
+	{
+	 move r2, zero
+	 move r3, zero
+	}
+	moveli TREG_SYSCALL_NR_NAME, __NR_clone
+	swint1
+
+	bnez r1, 0f
+	jrp lr
+PSEUDO_END (__vfork)
+libc_hidden_def (vfork)
+
+weak_alias (__vfork, vfork)