*
* (C) Copyright 2010-2011 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
*
- * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
- * OR IMPLIED. ANY USE IS AT YOUR OWN RISK.
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
*
- * Permission is hereby granted to use or copy this program
- * for any purpose, provided the above notices are retained on all copies.
- * Permission to modify the code and to distribute modified code is granted,
- * provided the above notices are retained, and a notice that the code was
- * modified is included with the above copyright notice.
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
*/
#include <lttng/bug.h>
+#include <unistd.h>
+#include <limits.h>
-/*
- * Align pointer on natural object alignment.
- */
-#define object_align(obj) PTR_ALIGN(obj, __alignof__(*(obj)))
-#define object_align_floor(obj) PTR_ALIGN_FLOOR(obj, __alignof__(*(obj)))
+#ifdef __FreeBSD__
+#include <machine/param.h>
+#endif
+
+#ifdef _SC_PAGE_SIZE
+#define LTTNG_UST_PAGE_SIZE sysconf(_SC_PAGE_SIZE)
+#elif defined(PAGE_SIZE)
+#define LTTNG_UST_PAGE_SIZE PAGE_SIZE
+#else
+#error "Please add page size detection for your OS."
+#endif
+
+#define LTTNG_UST_PAGE_MASK (~(LTTNG_UST_PAGE_SIZE - 1))
+
+#define __LTTNG_UST_ALIGN_MASK(v, mask) (((v) + (mask)) & ~(mask))
+#define LTTNG_UST_ALIGN(v, align) __LTTNG_UST_ALIGN_MASK(v, (__typeof__(v)) (align) - 1)
+#define LTTNG_UST_PAGE_ALIGN(addr) LTTNG_UST_ALIGN(addr, LTTNG_UST_PAGE_SIZE)
/**
- * offset_align - Calculate the offset needed to align an object on its natural
- * alignment towards higher addresses.
+ * lttng_ust_offset_align - Calculate the offset needed to align an object on
+ * its natural alignment towards higher addresses.
* @align_drift: object offset from an "alignment"-aligned address.
* @alignment: natural object alignment. Must be non-zero, power of 2.
*
* Returns the offset that must be added to align towards higher
* addresses.
*/
-#define offset_align(align_drift, alignment) \
+#define lttng_ust_offset_align(align_drift, alignment) \
({ \
- BUILD_RUNTIME_BUG_ON((alignment) == 0 \
+ LTTNG_BUILD_RUNTIME_BUG_ON((alignment) == 0 \
|| ((alignment) & ((alignment) - 1))); \
(((alignment) - (align_drift)) & ((alignment) - 1)); \
})
/**
- * offset_align_floor - Calculate the offset needed to align an object
- * on its natural alignment towards lower addresses.
+ * lttng_ust_offset_align_floor - Calculate the offset needed to align an
+ * object on its natural alignment towards lower addresses.
* @align_drift: object offset from an "alignment"-aligned address.
* @alignment: natural object alignment. Must be non-zero, power of 2.
*
* Returns the offset that must be substracted to align towards lower addresses.
*/
-#define offset_align_floor(align_drift, alignment) \
+#define lttng_ust_offset_align_floor(align_drift, alignment) \
({ \
- BUILD_RUNTIME_BUG_ON((alignment) == 0 \
+ LTTNG_BUILD_RUNTIME_BUG_ON((alignment) == 0 \
|| ((alignment) & ((alignment) - 1))); \
- (((align_drift) - (alignment)) & ((alignment) - 1); \
+ (((align_drift) - (alignment)) & ((alignment) - 1)); \
})
+/*
+ * Non-namespaced defines for backwards compatibility,
+ * introduced in 2.13, should be removed in the future.
+ */
+
+/* Cygwin limits.h defines its own PAGE_SIZE */
+#ifndef PAGE_SIZE
+#define PAGE_SIZE LTTNG_UST_PAGE_SIZE
+#endif
+
+/* FreeBSD and macOS defines their own PAGE_MASK. */
+#ifndef PAGE_MASK
+#define PAGE_MASK LTTNG_UST_PAGE_MASK
+#endif
+
+/* FreeBSD machine/param.h defines its own ALIGN */
+#ifndef ALIGN
+#define ALIGN LTTNG_UST_ALIGN
+#endif
+
+#ifndef PAGE_ALIGN
+#define PAGE_ALIGN LTTNG_UST_PAGE_ALIGN
+#endif
+
+#ifndef offset_align
+#define offset_align lttng_ust_offset_align
+#endif
+
+#ifndef offset_align_floor
+#define offset_align_floor lttng_ust_offset_align_floor
+#endif
+
#endif /* _UST_ALIGN_H */