Add libatomic as a target library.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@187018 138bc75d-0d04-0410-961f-82ee72b054a4

4 files changed, 310 insertions, 0 deletions

diff --git a/libatomic/config/linux/arm/host-config.h b/libatomic/config/linux/arm/host-config.h
new file mode 100644
index 00000000000..5d87835da7f
--- /dev/null
+++ b/libatomic/config/linux/arm/host-config.h
@@ -0,0 +1,179 @@
+/* Copyright (C) 2012 Free Software Foundation, Inc.
+   Contributed by Richard Henderson <rth@redhat.com>.
+
+   This file is part of the GNU Atomic Library (libatomic).
+
+   Libatomic is free software; you can redistribute it and/or modify it
+   under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   Libatomic 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 General Public License for
+   more details.
+
+   Under Section 7 of GPL version 3, you are granted additional
+   permissions described in the GCC Runtime Library Exception, version
+   3.1, as published by the Free Software Foundation.
+
+   You should have received a copy of the GNU General Public License and
+   a copy of the GCC Runtime Library Exception along with this program;
+   see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <config/arm/arm-config.h>
+
+
+/* Kernel helper for 32-bit compare-and-exchange.  */
+typedef int (__kernel_cmpxchg_t) (UWORD oldval, UWORD newval, UWORD *ptr);
+#define __kernel_cmpxchg (*(__kernel_cmpxchg_t *) 0xffff0fc0)
+
+/* Kernel helper for 64-bit compare-and-exchange.  */
+typedef int (__kernel_cmpxchg64_t) (const U_8 * oldval, const U_8 * newval,
+				    U_8 *ptr);
+#define __kernel_cmpxchg64 (*(__kernel_cmpxchg64_t *) 0xffff0f60)
+
+/* Kernel helper for memory barrier.  */
+typedef void (__kernel_dmb_t) (void);
+#define __kernel_dmb (*(__kernel_dmb_t *) 0xffff0fa0)
+
+/* Kernel helper page version number.  */
+#define __kernel_helper_version (*(unsigned int *)0xffff0ffc)
+
+
+#ifndef HAVE_STREX
+static inline bool
+atomic_compare_exchange_w (UWORD *mptr, UWORD *eptr, UWORD newval,
+			   bool weak_p UNUSED, int sm UNUSED, int fm UNUSED)
+{
+  bool ret = true;
+  UWORD oldval;
+
+  oldval = *eptr;
+  if (__builtin_expect (__kernel_cmpxchg (oldval, newval, mptr) != 0, 0))
+    {
+      oldval = *mptr;
+      ret = false;
+    }
+  *eptr = oldval;
+
+  return ret;
+}
+# define atomic_compare_exchange_w atomic_compare_exchange_w
+# if N == WORDSIZE
+#  define atomic_compare_exchange_n atomic_compare_exchange_w
+# endif
+#endif /* HAVE_STREX */
+
+#if !defined(HAVE_STREXBHD) && defined(HAVE_KERNEL64) && N == 8
+static inline bool
+atomic_compare_exchange_n (UTYPE *mptr, UTYPE *eptr, UTYPE newval,
+			   bool weak_p UNUSED, int sm UNUSED, int fm UNUSED)
+{
+  if (__kernel_cmpxchg64 (eptr, &newval, mptr) == 0)
+    return true;
+  else
+    {
+      *eptr = *mptr;
+      return false;
+    }
+}
+#define atomic_compare_exchange_n atomic_compare_exchange_n
+#endif
+
+#if !defined(HAVE_DMB) && !defined(HAVE_DMB_MCR)
+static inline void
+pre_barrier(int model UNUSED)
+{
+  __kernel_dmb ();
+}
+
+static inline void
+post_barrier(int model UNUSED)
+{
+  __kernel_dmb ();
+}
+# define pre_post_barrier 1
+#endif /* !HAVE_DMB */
+
+#if HAVE_IFUNC
+extern bool libat_have_strexbhd HIDDEN;
+
+# define IFUNC_COND_1	libat_have_strexbhd
+# define IFUNC_COND_2	(__kernel_helper_version >= 5)
+
+/* Alternative 1 is -march=armv7-a -- we have everything native.  */
+# if IFUNC_ALT == 1
+#  undef  HAVE_ATOMIC_CAS_1
+#  undef  HAVE_ATOMIC_CAS_2
+#  undef  HAVE_ATOMIC_CAS_4
+#  undef  HAVE_ATOMIC_CAS_8
+#  undef  HAVE_ATOMIC_EXCHANGE_1
+#  undef  HAVE_ATOMIC_EXCHANGE_2
+#  undef  HAVE_ATOMIC_EXCHANGE_4
+#  undef  HAVE_ATOMIC_EXCHANGE_8
+#  undef  HAVE_ATOMIC_LDST_1
+#  undef  HAVE_ATOMIC_LDST_2
+#  undef  HAVE_ATOMIC_LDST_4
+#  undef  HAVE_ATOMIC_LDST_8
+#  undef  HAVE_ATOMIC_FETCH_OP_1
+#  undef  HAVE_ATOMIC_FETCH_OP_2
+#  undef  HAVE_ATOMIC_FETCH_OP_4
+#  undef  HAVE_ATOMIC_FETCH_OP_8
+#  undef  HAVE_ATOMIC_TAS_1
+#  undef  HAVE_ATOMIC_TAS_2
+#  undef  HAVE_ATOMIC_TAS_4
+#  undef  HAVE_ATOMIC_TAS_8
+#  define HAVE_ATOMIC_CAS_1		1
+#  define HAVE_ATOMIC_CAS_2		1
+#  define HAVE_ATOMIC_CAS_4		1
+#  define HAVE_ATOMIC_CAS_8		1
+#  define HAVE_ATOMIC_EXCHANGE_1	1
+#  define HAVE_ATOMIC_EXCHANGE_2	1
+#  define HAVE_ATOMIC_EXCHANGE_4	1
+#  define HAVE_ATOMIC_EXCHANGE_8	1
+#  define HAVE_ATOMIC_LDST_1		1
+#  define HAVE_ATOMIC_LDST_2		1
+#  define HAVE_ATOMIC_LDST_4		1
+#  define HAVE_ATOMIC_LDST_8		1
+#  define HAVE_ATOMIC_FETCH_OP_1	1
+#  define HAVE_ATOMIC_FETCH_OP_2	1
+#  define HAVE_ATOMIC_FETCH_OP_4	1
+#  define HAVE_ATOMIC_FETCH_OP_8	1
+#  define HAVE_ATOMIC_TAS_1		1
+#  define HAVE_ATOMIC_TAS_2		1
+#  define HAVE_ATOMIC_TAS_4		1
+#  define HAVE_ATOMIC_TAS_8		1
+# endif /* IFUNC_ALT == 1 */
+
+# undef  MAYBE_HAVE_ATOMIC_CAS_1
+# define MAYBE_HAVE_ATOMIC_CAS_1	IFUNC_COND_1
+# undef  MAYBE_HAVE_ATOMIC_EXCHANGE_1
+# define MAYBE_HAVE_ATOMIC_EXCHANGE_1	MAYBE_HAVE_ATOMIC_CAS_1
+# undef  MAYBE_HAVE_ATOMIC_LDST_1
+# define MAYBE_HAVE_ATOMIC_LDST_1	MAYBE_HAVE_ATOMIC_CAS_1
+# undef  MAYBE_HAVE_ATOMIC_CAS_2
+# define MAYBE_HAVE_ATOMIC_CAS_2	IFUNC_COND_1
+# undef  MAYBE_HAVE_ATOMIC_EXCHANGE_2
+# define MAYBE_HAVE_ATOMIC_EXCHANGE_2	MAYBE_HAVE_ATOMIC_CAS_2
+# undef  MAYBE_HAVE_ATOMIC_LDST_2
+# define MAYBE_HAVE_ATOMIC_LDST_2	MAYBE_HAVE_ATOMIC_CAS_2
+# undef  MAYBE_HAVE_ATOMIC_CAS_4
+# define MAYBE_HAVE_ATOMIC_CAS_4	IFUNC_COND_1
+# undef  MAYBE_HAVE_ATOMIC_EXCHANGE_4
+# define MAYBE_HAVE_ATOMIC_EXCHANGE_4	MAYBE_HAVE_ATOMIC_CAS_4
+# undef  MAYBE_HAVE_ATOMIC_LDST_4
+# define MAYBE_HAVE_ATOMIC_LDST_4	MAYBE_HAVE_ATOMIC_CAS_4
+# undef  MAYBE_HAVE_ATOMIC_CAS_8
+# define MAYBE_HAVE_ATOMIC_CAS_8	(IFUNC_COND_1 | IFUNC_COND_2)
+# undef  MAYBE_HAVE_ATOMIC_EXCHANGE_8
+# define MAYBE_HAVE_ATOMIC_EXCHANGE_8	MAYBE_HAVE_ATOMIC_CAS_8
+# undef  MAYBE_HAVE_ATOMIC_LDST_8
+# define MAYBE_HAVE_ATOMIC_LDST_8	MAYBE_HAVE_ATOMIC_CAS_8
+
+# define IFUNC_NCOND(N)			(N == 8 ? 2 : 1)
+
+#endif /* HAVE_IFUNC */
+
+#include_next <host-config.h>
diff --git a/libatomic/config/linux/arm/init.c b/libatomic/config/linux/arm/init.c
new file mode 100644
index 00000000000..532160b4520
--- /dev/null
+++ b/libatomic/config/linux/arm/init.c
@@ -0,0 +1,36 @@
+/* Copyright (C) 2012 Free Software Foundation, Inc.
+   Contributed by Richard Henderson <rth@redhat.com>.
+
+   This file is part of the GNU Atomic Library (libatomic).
+
+   Libatomic is free software; you can redistribute it and/or modify it
+   under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   Libatomic 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 General Public License for
+   more details.
+
+   Under Section 7 of GPL version 3, you are granted additional
+   permissions described in the GCC Runtime Library Exception, version
+   3.1, as published by the Free Software Foundation.
+
+   You should have received a copy of the GNU General Public License and
+   a copy of the GCC Runtime Library Exception along with this program;
+   see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include "libatomic_i.h"
+
+#if HAVE_IFUNC
+
+bool libat_have_strexbhd;
+
+static void __attribute__((constructor))
+init_cpu_revision (void)
+{
+}
+
+#endif /* HAVE_IFUNC */
diff --git a/libatomic/config/linux/arm/load_n.c b/libatomic/config/linux/arm/load_n.c
new file mode 100644
index 00000000000..94e427813ae
--- /dev/null
+++ b/libatomic/config/linux/arm/load_n.c
@@ -0,0 +1,49 @@
+/* Copyright (C) 2012 Free Software Foundation, Inc.
+   Contributed by Richard Henderson <rth@redhat.com>.
+
+   This file is part of the GNU Atomic Library (libatomic).
+
+   Libatomic is free software; you can redistribute it and/or modify it
+   under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   Libatomic 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 General Public License for
+   more details.
+
+   Under Section 7 of GPL version 3, you are granted additional
+   permissions described in the GCC Runtime Library Exception, version
+   3.1, as published by the Free Software Foundation.
+
+   You should have received a copy of the GNU General Public License and
+   a copy of the GCC Runtime Library Exception along with this program;
+   see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include "libatomic_i.h"
+
+
+/* If we use the builtin we'll get __sync_synchronize, not __kernel_dmb.  */
+#if !DONE && N <= WORDSIZE && !defined(HAVE_DMB) && !defined(HAVE_DMB_MCR)
+UTYPE
+SIZE(libat_load) (UTYPE *mptr, int smodel)
+{
+  UTYPE ret;
+
+  if (maybe_specialcase_relaxed(smodel))
+    ret = *mptr;
+  else
+    {
+      __kernel_dmb ();
+      ret = *mptr;
+      __kernel_dmb ();
+    }
+  return ret;
+}
+
+#define DONE 1
+#endif /* !HAVE_DMB */
+
+#include "../../../load_n.c"
diff --git a/libatomic/config/linux/arm/store_n.c b/libatomic/config/linux/arm/store_n.c
new file mode 100644
index 00000000000..4ab44c3014f
--- /dev/null
+++ b/libatomic/config/linux/arm/store_n.c
@@ -0,0 +1,46 @@
+/* Copyright (C) 2012 Free Software Foundation, Inc.
+   Contributed by Richard Henderson <rth@redhat.com>.
+
+   This file is part of the GNU Atomic Library (libatomic).
+
+   Libatomic is free software; you can redistribute it and/or modify it
+   under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   Libatomic 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 General Public License for
+   more details.
+
+   Under Section 7 of GPL version 3, you are granted additional
+   permissions described in the GCC Runtime Library Exception, version
+   3.1, as published by the Free Software Foundation.
+
+   You should have received a copy of the GNU General Public License and
+   a copy of the GCC Runtime Library Exception along with this program;
+   see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include "libatomic_i.h"
+
+
+/* If we use the builtin we'll get __sync_synchronize, not __kernel_dmb.  */
+#if !DONE && N <= WORDSIZE && !defined(HAVE_DMB) && !defined(HAVE_DMB_MCR)
+void
+SIZE(libat_store) (UTYPE *mptr, UTYPE val, int smodel)
+{
+  if (maybe_specialcase_relaxed(smodel))
+    *mptr = val;
+  else
+    {
+      __kernel_dmb ();
+      *mptr = val;
+      __kernel_dmb ();
+    }
+}
+
+#define DONE 1
+#endif /* !HAVE_DMB */
+
+#include "../../../store_n.c"