Add RTEMS support for GCC libatomic

Signed-off-by: Sebastian Huber <sebastian.huber@embedded-brains.de>

2 files changed, 54 insertions, 1 deletions

diff --git a/newlib/libc/sys/rtems/crt0.c b/newlib/libc/sys/rtems/crt0.c
index 8d87fd4cf..3bf70832c 100644
--- a/newlib/libc/sys/rtems/crt0.c
+++ b/newlib/libc/sys/rtems/crt0.c
@@ -16,6 +16,7 @@
 #include <time.h> /* struct timespec */
 #include <unistd.h> /* isatty */
 #include <sys/lock.h> /* _Mutex_recursive_Control */
+#include <machine/_libatomic.h>
 
 void rtems_provides_crt0( void ) {}  /* dummy symbol so file always has one */
 
@@ -58,7 +59,13 @@ RTEMS_STUB(int, _Sched_Count(void), { return -1; })
 RTEMS_STUB(int, _Sched_Index(void), { return -1; })
 RTEMS_STUB(int, _Sched_Name_to_index(const char *p, size_t s), { return -1; })
 RTEMS_STUB(int, _Sched_Processor_count(int i), { return 1; })
- 
+
+/* Stubs for routines from RTEMS <machine/_libatomic.h> */
+RTEMS_STUB(__uint32_t, _Libatomic_Protect_start(void *ptr), { return 0; });
+RTEMS_STUB(void, _Libatomic_Protect_end(void *ptr, __uint32_t isr_level), { });
+RTEMS_STUB(void, _Libatomic_Lock_n(void *ptr, __size_t n), { });
+RTEMS_STUB(void, _Libatomic_Unlock_n(void *ptr, __size_t n), { });
+
 #if defined(__GNUC__)
 /*
  * stubs for libstdc++ rtems-threads support functions from gcc/gthr-rtems.h
diff --git a/newlib/libc/sys/rtems/include/machine/_libatomic.h b/newlib/libc/sys/rtems/include/machine/_libatomic.h
new file mode 100644
index 000000000..3456440a2
--- /dev/null
+++ b/newlib/libc/sys/rtems/include/machine/_libatomic.h
@@ -0,0 +1,46 @@
+/*-
+ * Copyright (c) 2016 embedded brains GmbH
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+/*
+ * The libatomic is a part of GCC.  It provides library support for C11/C++11
+ * atomic operations.  This file defines the interface to the operating system
+ * for the RTEMS configuration of libatomic.
+ */
+
+#include <sys/cdefs.h>
+#include <sys/_types.h>
+
+__BEGIN_DECLS
+
+__uint32_t _Libatomic_Protect_start(void *);
+
+void _Libatomic_Protect_end(void *, __uint32_t);
+
+void _Libatomic_Lock_n(void *, __size_t);
+
+void _Libatomic_Unlock_n(void *, __size_t);
+
+__END_DECLS