/*
- * Copyright (c) 2010 Nicira Networks.
+ * Copyright (c) 2010, 2011, 2014 Nicira, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
#include <stdint.h>
#include "byte-order.h"
+#include "openvswitch/types.h"
+#include "type-props.h"
+#include "util.h"
/* Public API. */
static inline uint16_t get_unaligned_u16(const uint16_t *);
static inline uint32_t get_unaligned_u32(const uint32_t *);
-static inline uint64_t get_unaligned_u64(const uint64_t *);
static inline void put_unaligned_u16(uint16_t *, uint16_t);
static inline void put_unaligned_u32(uint32_t *, uint32_t);
static inline void put_unaligned_u64(uint64_t *, uint64_t);
+static inline ovs_be16 get_unaligned_be16(const ovs_be16 *);
+static inline ovs_be32 get_unaligned_be32(const ovs_be32 *);
+static inline ovs_be64 get_unaligned_be64(const ovs_be64 *);
+static inline void put_unaligned_be16(ovs_be16 *, ovs_be16);
+static inline void put_unaligned_be32(ovs_be32 *, ovs_be32);
+static inline void put_unaligned_be64(ovs_be64 *, ovs_be64);
+
+/* uint64_t get_unaligned_u64(uint64_t *p);
+ *
+ * Returns the value of the possibly misaligned uint64_t at 'p'. 'p' may
+ * actually be any type that points to a 64-bit integer. That is, on Unix-like
+ * 32-bit ABIs, it may point to an "unsigned long long int", and on Unix-like
+ * 64-bit ABIs, it may point to an "unsigned long int" or an "unsigned long
+ * long int".
+ *
+ * This is special-cased because on some Linux targets, the kernel __u64 is
+ * unsigned long long int and the userspace uint64_t is unsigned long int, so
+ * that any single function prototype would fail to accept one or the other.
+ *
+ * Below, "sizeof (*(P) % 1)" verifies that *P has an integer type, since
+ * operands to % must be integers.
+ */
+#define get_unaligned_u64(P) \
+ (BUILD_ASSERT(sizeof *(P) == 8), \
+ BUILD_ASSERT_GCCONLY(!TYPE_IS_SIGNED(typeof(*(P)))), \
+ (void) sizeof (*(P) % 1), \
+ get_unaligned_u64__((const uint64_t *) (P)))
+
#ifdef __GNUC__
/* GCC implementations. */
-#define GCC_UNALIGNED_ACCESSORS(SIZE) \
-struct unaligned_u##SIZE { \
- uint##SIZE##_t x __attribute__((__packed__)); \
-}; \
-static inline struct unaligned_u##SIZE * \
-unaligned_u##SIZE(const uint##SIZE##_t *p) \
-{ \
- return (struct unaligned_u##SIZE *) p; \
-} \
- \
-static inline uint##SIZE##_t \
-get_unaligned_u##SIZE(const uint##SIZE##_t *p) \
-{ \
- return unaligned_u##SIZE(p)->x; \
-} \
- \
-static inline void \
-put_unaligned_u##SIZE(uint##SIZE##_t *p, uint##SIZE##_t x) \
-{ \
- unaligned_u##SIZE(p)->x = x; \
-}
-
-GCC_UNALIGNED_ACCESSORS(16);
-GCC_UNALIGNED_ACCESSORS(32);
-GCC_UNALIGNED_ACCESSORS(64);
+#define GCC_UNALIGNED_ACCESSORS(TYPE, ABBREV) \
+struct unaligned_##ABBREV { \
+ TYPE x __attribute__((__packed__)); \
+}; \
+static inline struct unaligned_##ABBREV * \
+unaligned_##ABBREV(const TYPE *p) \
+{ \
+ return (struct unaligned_##ABBREV *) p; \
+} \
+ \
+static inline TYPE \
+get_unaligned_##ABBREV(const TYPE *p) \
+{ \
+ return unaligned_##ABBREV(p)->x; \
+} \
+ \
+static inline void \
+put_unaligned_##ABBREV(TYPE *p, TYPE x) \
+{ \
+ unaligned_##ABBREV(p)->x = x; \
+}
+
+GCC_UNALIGNED_ACCESSORS(uint16_t, u16);
+GCC_UNALIGNED_ACCESSORS(uint32_t, u32);
+GCC_UNALIGNED_ACCESSORS(uint64_t, u64__); /* Special case: see below. */
+
+GCC_UNALIGNED_ACCESSORS(ovs_be16, be16);
+GCC_UNALIGNED_ACCESSORS(ovs_be32, be32);
+GCC_UNALIGNED_ACCESSORS(ovs_be64, be64);
#else
/* Generic implementations. */
p[3] = x;
}
-static inline uint64_t get_unaligned_u64(const uint64_t *p_)
+static inline uint64_t get_unaligned_u64__(const uint64_t *p_)
{
const uint8_t *p = (const uint8_t *) p_;
return ntohll(((uint64_t) p[0] << 56)
| p[7]);
}
-static inline void put_unaligned_u64(uint64_t *p_, uint64_t x_)
+static inline void put_unaligned_u64__(uint64_t *p_, uint64_t x_)
{
uint8_t *p = (uint8_t *) p_;
uint64_t x = ntohll(x_);
p[6] = x >> 8;
p[7] = x;
}
+
+/* Only sparse cares about the difference between uint<N>_t and ovs_be<N>, and
+ * that takes the GCC branch, so there's no point in working too hard on these
+ * accessors. */
+#define get_unaligned_be16 get_unaligned_u16
+#define get_unaligned_be32 get_unaligned_u32
+#define put_unaligned_be16 put_unaligned_u16
+#define put_unaligned_be32 put_unaligned_u32
+#define put_unaligned_be64 put_unaligned_u64
+
+/* We do not #define get_unaligned_be64 as for the other be<N> functions above,
+ * because such a definition would mean that get_unaligned_be64() would have a
+ * different interface in each branch of the #if: with GCC it would take a
+ * "ovs_be64 *", with other compilers any pointer-to-64-bit-type (but not void
+ * *). The latter means code like "get_unaligned_be64(ofpbuf_data(b))" would
+ * work with GCC but not with other compilers, which is surprising and
+ * undesirable. Hence this wrapper function. */
+static inline ovs_be64
+get_unaligned_be64(const ovs_be64 *p)
+{
+ return get_unaligned_u64(p);
+}
+#endif
+
+/* Stores 'x' at possibly misaligned address 'p'.
+ *
+ * put_unaligned_u64() could be overloaded in the same way as
+ * get_unaligned_u64(), but so far it has not proven necessary.
+ */
+static inline void
+put_unaligned_u64(uint64_t *p, uint64_t x)
+{
+ put_unaligned_u64__(p, x);
+}
+\f
+/* Returns the value in 'x'. */
+static inline uint32_t
+get_16aligned_u32(const ovs_16aligned_u32 *x)
+{
+ return ((uint32_t) x->hi << 16) | x->lo;
+}
+
+/* Stores 'value' in 'x'. */
+static inline void
+put_16aligned_u32(ovs_16aligned_u32 *x, uint32_t value)
+{
+ x->hi = value >> 16;
+ x->lo = value;
+}
+
+/* Returns the value in 'x'. */
+static inline uint64_t
+get_32aligned_u64(const ovs_32aligned_u64 *x)
+{
+ return ((uint64_t) x->hi << 32) | x->lo;
+}
+
+/* Stores 'value' in 'x'. */
+static inline void
+put_32aligned_u64(ovs_32aligned_u64 *x, uint64_t value)
+{
+ x->hi = value >> 32;
+ x->lo = value;
+}
+
+#ifndef __CHECKER__
+/* Returns the value of 'x'. */
+static inline ovs_be32
+get_16aligned_be32(const ovs_16aligned_be32 *x)
+{
+#ifdef WORDS_BIGENDIAN
+ return ((ovs_be32) x->hi << 16) | x->lo;
+#else
+ return ((ovs_be32) x->lo << 16) | x->hi;
+#endif
+}
+
+/* Stores network byte order 'value' into 'x'. */
+static inline void
+put_16aligned_be32(ovs_16aligned_be32 *x, ovs_be32 value)
+{
+#if WORDS_BIGENDIAN
+ x->hi = value >> 16;
+ x->lo = value;
+#else
+ x->hi = value;
+ x->lo = value >> 16;
+#endif
+}
+
+/* Returns the value of 'x'. */
+static inline ovs_be64
+get_32aligned_be64(const ovs_32aligned_be64 *x)
+{
+#ifdef WORDS_BIGENDIAN
+ return ((ovs_be64) x->hi << 32) | x->lo;
+#else
+ return ((ovs_be64) x->lo << 32) | x->hi;
+#endif
+}
+
+/* Stores network byte order 'value' into 'x'. */
+static inline void
+put_32aligned_be64(ovs_32aligned_be64 *x, ovs_be64 value)
+{
+#if WORDS_BIGENDIAN
+ x->hi = value >> 32;
+ x->lo = value;
+#else
+ x->hi = value;
+ x->lo = value >> 32;
+#endif
+}
+#else /* __CHECKER__ */
+/* Making sparse happy with these functions also makes them unreadable, so
+ * don't bother to show it their implementations. */
+ovs_be32 get_16aligned_be32(const ovs_16aligned_be32 *);
+void put_16aligned_be32(ovs_16aligned_be32 *, ovs_be32);
+ovs_be64 get_32aligned_be64(const ovs_32aligned_be64 *);
+void put_32aligned_be64(ovs_32aligned_be64 *, ovs_be64);
#endif
#endif /* unaligned.h */
projects / cascardo / ovs.git / blobdiff