kvx: add support for kvx arch to uClibc-ng

This commit adds support for Kalray VLIW family (kvx)

Kalray kv3 core is embedded in Kalray Coolidge SoC. This core which is the
third of the KV family has the following features:

    32/64 bits execution mode
    6-issue VLIW architecture
    64 x 64bits general purpose registers
    SIMD instructions
    little-endian

In order to build a usable toolchain, build scripts are provided at the
following address: https://github.com/kalray/build-scripts.

Kalray uses FOSS which is available at https://github.com/kalray
This includes Linux kernel, uClibc-ng, gcc, binutils, etc.

Signed-off-by: Clément Léger <cleger@kalray.eu>
Signed-off-by: Guillaume Thouvenin <gthouvenin@kalray.eu>
Signed-off-by: Laurent Thevenoux <lthevenoux@kalray.eu>
Signed-off-by: Marc Poulhies <mpoulhies@kalray.eu>
Signed-off-by: Marius Gligor <mgligor@kalray.eu>
Signed-off-by: Yann Sionneau <ysionneau@kalray.eu>

8 files changed, 368 insertions, 0 deletions

diff --git a/libpthread/nptl/sysdeps/unix/sysv/linux/kvx/Makefile b/libpthread/nptl/sysdeps/unix/sysv/linux/kvx/Makefile
new file mode 100644
index 000000000..0d6f2f45d
--- /dev/null
+++ b/libpthread/nptl/sysdeps/unix/sysv/linux/kvx/Makefile
@@ -0,0 +1,13 @@
+# Makefile for uClibc NPTL
+#
+# Copyright (C) 2019 Kalray
+#
+# Licensed under the LGPL v2.1 or later, 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/libpthread/nptl/sysdeps/unix/sysv/linux/kvx/Makefile.arch b/libpthread/nptl/sysdeps/unix/sysv/linux/kvx/Makefile.arch
new file mode 100644
index 000000000..8af56320c
--- /dev/null
+++ b/libpthread/nptl/sysdeps/unix/sysv/linux/kvx/Makefile.arch
@@ -0,0 +1,14 @@
+# Makefile for uClibc NPTL
+#
+# Copyright (C) 2019 Kalray
+#
+# Licensed under the LGPL v2.1 or later, see the file COPYING.LIB in this tarball.
+#
+
+libpthread_linux_arch_SSRC =
+libpthread_linux_arch_CSRC = pthread_once.c
+
+libc_linux_arch_CSRC = fork.c
+
+CFLAGS += $(SSP_ALL_CFLAGS)
+
diff --git a/libpthread/nptl/sysdeps/unix/sysv/linux/kvx/bits/pthreadtypes.h b/libpthread/nptl/sysdeps/unix/sysv/linux/kvx/bits/pthreadtypes.h
new file mode 100644
index 000000000..e1bfe51cf
--- /dev/null
+++ b/libpthread/nptl/sysdeps/unix/sysv/linux/kvx/bits/pthreadtypes.h
@@ -0,0 +1,166 @@
+/*
+ * This file is subject to the terms and conditions of the LGPL V2.1
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2019 Kalray Inc.
+ */
+
+#ifndef _BITS_PTHREADTYPES_H
+#define _BITS_PTHREADTYPES_H	1
+
+#include <endian.h>
+
+#define __SIZEOF_PTHREAD_ATTR_T        64
+#define __SIZEOF_PTHREAD_MUTEX_T       48
+#define __SIZEOF_PTHREAD_MUTEXATTR_T    8
+#define __SIZEOF_PTHREAD_COND_T        72
+#define __SIZEOF_PTHREAD_COND_COMPAT_T 48
+#define __SIZEOF_PTHREAD_CONDATTR_T     8
+#define __SIZEOF_PTHREAD_RWLOCK_T      80
+#define __SIZEOF_PTHREAD_RWLOCKATTR_T   16
+#define __SIZEOF_PTHREAD_BARRIER_T      32
+#define __SIZEOF_PTHREAD_BARRIERATTR_T  16
+
+#define __PTHREAD_RWLOCK_INT_FLAGS_SHARED 1
+
+/* Thread identifiers.  The structure of the attribute type is not
+   exposed on purpose.  */
+typedef unsigned long int pthread_t;
+
+
+union pthread_attr_t
+{
+  char __size[__SIZEOF_PTHREAD_ATTR_T];
+  long int __align;
+};
+#ifndef __have_pthread_attr_t
+typedef union pthread_attr_t pthread_attr_t;
+# define __have_pthread_attr_t1
+#endif
+
+typedef struct __pthread_internal_list
+{
+  struct __pthread_internal_list *__prev;
+  struct __pthread_internal_list *__next;
+} __pthread_list_t;
+
+
+/* Data structures for mutex handling.  The structure of the attribute
+   type is not exposed on purpose.  */
+typedef union
+{
+  struct __pthread_mutex_s
+  {
+    int __lock;
+    unsigned int __count;
+    int __owner;
+    unsigned int __nusers;
+    /* KIND must stay at this position in the structure to maintain
+       binary compatibility with static initializers.  */
+    int __kind;
+    int __spins;
+    __pthread_list_t __list;
+#define __PTHREAD_MUTEX_HAVE_PREV	1
+  } __data;
+  char __size[__SIZEOF_PTHREAD_MUTEX_T];
+  long int __align;
+} pthread_mutex_t;
+
+/* Mutex __spins initializer used by PTHREAD_MUTEX_INITIALIZER.  */
+#define __PTHREAD_SPINS 0
+
+typedef union
+{
+  char __size[__SIZEOF_PTHREAD_MUTEXATTR_T];
+  long int __align;
+} pthread_mutexattr_t;
+
+/* Data structure for conditional variable handling.  The structure of
+   the attribute type is not exposed on purpose.  */
+typedef union
+{
+  struct
+  {
+    int __lock;
+    unsigned int __futex;
+    __extension__ unsigned long long int __total_seq;
+    __extension__ unsigned long long int __wakeup_seq;
+    __extension__ unsigned long long int __woken_seq;
+    void *__mutex;
+    unsigned int __nwaiters;
+    unsigned int __broadcast_seq;
+  } __data;
+  char __size[__SIZEOF_PTHREAD_COND_T];
+  __extension__ long long int __align;
+} pthread_cond_t;
+
+typedef union
+{
+  char __size[__SIZEOF_PTHREAD_CONDATTR_T];
+  int __align;
+} pthread_condattr_t;
+
+
+/* Keys for thread-specific data */
+typedef unsigned int pthread_key_t;
+
+
+/* Once-only execution */
+typedef int pthread_once_t;
+
+
+#if defined __USE_UNIX98 || defined __USE_XOPEN2K
+/* Data structure for read-write lock variable handling.  The
+   structure of the attribute type is not exposed on purpose.  */
+typedef union
+{
+  struct
+  {
+    int __lock;
+    unsigned int __nr_readers;
+    unsigned int __readers_wakeup;
+    unsigned int __writer_wakeup;
+    unsigned int __nr_readers_queued;
+    unsigned int __nr_writers_queued;
+    int __writer;
+    int __shared;
+    unsigned long int __pad1;
+    unsigned long int __pad2;
+    unsigned int __flags;
+  } __data;
+  char __size[__SIZEOF_PTHREAD_RWLOCK_T];
+  long int __align;
+} pthread_rwlock_t;
+
+#define __PTHREAD_RWLOCK_ELISION_EXTRA 0
+
+typedef union
+{
+  char __size[__SIZEOF_PTHREAD_RWLOCKATTR_T];
+  long int __align;
+} pthread_rwlockattr_t;
+#endif
+
+
+#ifdef __USE_XOPEN2K
+/* POSIX spinlock data type.  */
+typedef volatile int pthread_spinlock_t;
+
+
+/* POSIX barriers data type.  The structure of the type is
+   deliberately not exposed.  */
+typedef union
+{
+  char __size[__SIZEOF_PTHREAD_BARRIER_T];
+  long int __align;
+} pthread_barrier_t;
+
+typedef union
+{
+  char __size[__SIZEOF_PTHREAD_BARRIERATTR_T];
+  int __align;
+} pthread_barrierattr_t;
+#endif
+
+#endif	/* bits/pthreadtypes.h */
diff --git a/libpthread/nptl/sysdeps/unix/sysv/linux/kvx/bits/semaphore.h b/libpthread/nptl/sysdeps/unix/sysv/linux/kvx/bits/semaphore.h
new file mode 100644
index 000000000..0acafdbb0
--- /dev/null
+++ b/libpthread/nptl/sysdeps/unix/sysv/linux/kvx/bits/semaphore.h
@@ -0,0 +1,30 @@
+/*
+ * This file is subject to the terms and conditions of the LGPL V2.1
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2019 Kalray Inc.
+ */
+
+#ifndef _SEMAPHORE_H
+# error "Never use <bits/semaphore.h> directly; include <semaphore.h> instead."
+#endif
+
+#include <bits/wordsize.h>
+
+#if __WORDSIZE == 64
+# define __SIZEOF_SEM_T	32
+#else
+# define __SIZEOF_SEM_T	16
+#endif
+
+
+/* Value returned if `sem_open' failed.  */
+#define SEM_FAILED      ((sem_t *) 0)
+
+
+typedef union
+{
+  char __size[__SIZEOF_SEM_T];
+  long int __align;
+} sem_t;
diff --git a/libpthread/nptl/sysdeps/unix/sysv/linux/kvx/createthread.c b/libpthread/nptl/sysdeps/unix/sysv/linux/kvx/createthread.c
new file mode 100644
index 000000000..1b82c9190
--- /dev/null
+++ b/libpthread/nptl/sysdeps/unix/sysv/linux/kvx/createthread.c
@@ -0,0 +1,14 @@
+/*
+ * This file is subject to the terms and conditions of the LGPL V2.1
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2019 Kalray Inc.
+ */
+
+/* Value passed to 'clone' for initialization of the thread register.  */
+#define TLS_VALUE ((void *) (pd) \
+		   + TLS_PRE_TCB_SIZE + TLS_INIT_TCB_SIZE)
+
+/* Get the real implementation.	 */
+#include <sysdeps/pthread/createthread.c>
diff --git a/libpthread/nptl/sysdeps/unix/sysv/linux/kvx/fork.c b/libpthread/nptl/sysdeps/unix/sysv/linux/kvx/fork.c
new file mode 100644
index 000000000..4f7044a0b
--- /dev/null
+++ b/libpthread/nptl/sysdeps/unix/sysv/linux/kvx/fork.c
@@ -0,0 +1,11 @@
+#include <sched.h>
+#include <signal.h>
+#include <sysdep.h>
+#include <tls.h>
+
+#define ARCH_FORK() \
+  INLINE_SYSCALL (clone, 5,                                                  \
+                 CLONE_CHILD_SETTID | CLONE_CHILD_CLEARTID | SIGCHLD, 0,     \
+                 NULL, &THREAD_SELF->tid, NULL)
+
+#include "../fork.c"
diff --git a/libpthread/nptl/sysdeps/unix/sysv/linux/kvx/pthread_once.c b/libpthread/nptl/sysdeps/unix/sysv/linux/kvx/pthread_once.c
new file mode 100644
index 000000000..0d2749edf
--- /dev/null
+++ b/libpthread/nptl/sysdeps/unix/sysv/linux/kvx/pthread_once.c
@@ -0,0 +1,77 @@
+/*
+ * This file is subject to the terms and conditions of the LGPL V2.1
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2019 Kalray Inc.
+ */
+
+#include "pthreadP.h"
+#include <lowlevellock.h>
+
+unsigned long int __fork_generation attribute_hidden;
+
+static void
+clear_once_control (void *arg)
+{
+	pthread_once_t *once_control = (pthread_once_t *) arg;
+
+	*once_control = 0;
+	lll_futex_wake (once_control, INT_MAX, LLL_PRIVATE);
+}
+
+
+int
+__pthread_once (once_control, init_routine)
+	pthread_once_t *once_control;
+	void (*init_routine) (void);
+{
+	while (1)
+	{
+		int oldval, val, newval;
+
+		val = *once_control;
+		do
+		{
+			/* Check if the initialized has already been done. */
+			if ((val & 2) != 0)
+				return 0;
+
+			oldval = val;
+			newval = (oldval & 3) | __fork_generation | 1;
+			val = atomic_compare_and_exchange_val_acq (once_control, newval, oldval);
+		} while (__builtin_expect (val != oldval, 0));
+
+		/* Check if another thread already runs the initializer. */
+		if ((oldval & 1) != 0)
+		{
+		/* Check whether the initializer execution was interrupted
+		 * by a fork. */
+			if (((oldval ^ newval) & -4) == 0)
+			{
+				/* Same generation, some other thread was faster. Wait. */
+				lll_futex_wait (once_control, newval, LLL_PRIVATE);
+				continue;
+			}
+		}
+		/* This thread is the first here.  Do the initialization.
+		 * Register a cleanup handler so that in case the thread gets
+		 * interrupted the initialization can be restarted. */
+		pthread_cleanup_push (clear_once_control, once_control);
+
+		init_routine ();
+
+		pthread_cleanup_pop (0);
+
+		/* Add one to *once_control. */
+		atomic_increment (once_control);
+
+		/* Wake up all other threads. */
+		lll_futex_wake (once_control, INT_MAX, LLL_PRIVATE);
+		break;
+	}
+
+	return 0;
+}
+weak_alias (__pthread_once, pthread_once)
+strong_alias (__pthread_once, __pthread_once_internal)
diff --git a/libpthread/nptl/sysdeps/unix/sysv/linux/kvx/sysdep-cancel.h b/libpthread/nptl/sysdeps/unix/sysv/linux/kvx/sysdep-cancel.h
new file mode 100644
index 000000000..09f538fc2
--- /dev/null
+++ b/libpthread/nptl/sysdeps/unix/sysv/linux/kvx/sysdep-cancel.h
@@ -0,0 +1,43 @@
+/*
+ * This file is subject to the terms and conditions of the LGPV V2.1
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2019 Kalray Inc.
+ */
+
+#include <sysdep.h>
+#include <tls.h>
+#ifndef __ASSEMBLER__
+# include <pthreadP.h>
+#endif
+
+#if !defined NOT_IN_libc || defined IS_IN_libpthread || defined IS_IN_librt
+
+# if defined IS_IN_libpthread
+#  define __local_multiple_threads __pthread_multiple_threads
+# elif !defined NOT_IN_libc
+#  define __local_multiple_threads __libc_multiple_threads
+# endif
+
+# if defined IS_IN_libpthread || !defined NOT_IN_libc
+extern int __local_multiple_threads attribute_hidden;
+#  define SINGLE_THREAD_P __builtin_expect (__local_multiple_threads == 0, 1)
+# else
+/*  There is no __local_multiple_threads for librt, so use the TCB.  */
+#  define SINGLE_THREAD_P						\
+  __builtin_expect (THREAD_GETMEM (THREAD_SELF,				\
+				   header.multiple_threads) == 0, 1)
+# endif
+
+#else
+
+/* For rtld, et cetera.  */
+# define SINGLE_THREAD_P 1
+# define NO_CANCELLATION 1
+
+#endif
+
+# define RTLD_SINGLE_THREAD_P \
+  __builtin_expect (THREAD_GETMEM (THREAD_SELF, \
+				   header.multiple_threads) == 0, 1)