/*
* Copyright (c) 1992, 1993, 1994, 1995, 1996
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that: (1) source code distributions
* retain the above copyright notice and this paragraph in its entirety, (2)
* distributions including binary code include the above copyright notice and
* this paragraph in its entirety in the documentation or other materials
* provided with the distribution, and (3) all advertising materials mentioning
* features or use of this software display the following acknowledgement:
* ``This product includes software developed by the University of California,
* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
* the University nor the names of its contributors may be used to endorse
* or promote products derived from this software without specific prior
* written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
/*
* If we have versions of GCC or Clang that support an __attribute__
* to say "if we're building with unsigned behavior sanitization,
* don't complain about undefined behavior in this function", we
* label these functions with that attribute - we *know* it's undefined
* in the C standard, but we *also* know it does what we want with
* the ISA we're targeting and the compiler we're using.
*
* For GCC 4.9.0 and later, we use __attribute__((no_sanitize_undefined));
* pre-5.0 GCC doesn't have __has_attribute, and I'm not sure whether
* GCC or Clang first had __attribute__((no_sanitize(XXX)).
*
* For Clang, we check for __attribute__((no_sanitize(XXX)) with
* __has_attribute, as there are versions of Clang that support
* __attribute__((no_sanitize("undefined")) but don't support
* __attribute__((no_sanitize_undefined)).
*
* We define this here, rather than in funcattrs.h, because we
* only want it used here, we don't want it to be broadly used.
* (Any printer will get this defined, but this should at least
* make it harder for people to find.)
*/
#if defined(__GNUC__) && ((__GNUC__ * 100 + __GNUC_MINOR__) >= 409)
#define UNALIGNED_OK __attribute__((no_sanitize_undefined))
#elif __has_attribute(no_sanitize)
#define UNALIGNED_OK __attribute__((no_sanitize("undefined")))
#else
#define UNALIGNED_OK
#endif
#ifdef __NetBSD__
#include <string.h>
/*
* Do it the portable way and let the compiler optimize the code
*/
static inline uint16_t EXTRACT_16BITS(const void *p)
{
uint16_t t;
memcpy(&t, p, sizeof(t));
return ntohs(t);
}
static inline uint32_t EXTRACT_24BITS(const void *p)
{
uint8_t t[3];
memcpy(t, p, sizeof(t));
return
((uint32_t)t[0] << 16) |
((uint32_t)t[1] << 8) |
t[2];
}
static inline uint32_t EXTRACT_32BITS(const void *p)
{
uint32_t t;
memcpy(&t, p, sizeof(t));
return ntohl(t);
}
static inline uint64_t EXTRACT_48BITS(const void *p)
{
uint8_t t[6];
memcpy(t, p, sizeof(t));
return
((uint64_t)t[0] << 40) |
((uint64_t)t[1] << 32) |
((uint64_t)t[2] << 24) |
((uint64_t)t[3] << 16) |
((uint64_t)t[4] << 8) |
t[5];
}
static inline uint64_t EXTRACT_64BITS(const void *p)
{
uint32_t t[2];
memcpy(&t[0], p, sizeof(t[0]));
memcpy(&t[1], (const uint8_t *)p + sizeof(t[0]), sizeof(t[1]));
return ((uint64_t)ntohl(t[0]) << 32) | ntohl(t[1]);
}
static inline uint8_t EXTRACT_LE_8BITS(const void *p)
{
uint8_t t[1];
memcpy(t, p, sizeof(t));
return t[0];
}
static inline uint16_t EXTRACT_LE_16BITS(const void *p)
{
uint8_t t[2];
memcpy(t, p, sizeof(t));
return
((uint16_t)t[1] << 8) |
t[0];
}
static inline uint32_t EXTRACT_LE_24BITS(const void *p)
{
uint8_t t[3];
memcpy(t, p, sizeof(t));
return
((uint32_t)t[2] << 16) |
((uint32_t)t[1] << 8) |
t[0];
}
static inline uint32_t EXTRACT_LE_32BITS(const void *p)
{
uint8_t t[4];
memcpy(t, p, sizeof(t));
return
((uint32_t)t[3] << 24) |
((uint32_t)t[2] << 16) |
((uint32_t)t[1] << 8) |
t[0];
}
static inline uint64_t EXTRACT_LE_64BITS(const void *p)
{
uint8_t t[8];
memcpy(&t, p, sizeof(t));
return
((uint64_t)t[7] << 56) |
((uint64_t)t[6] << 48) |
((uint64_t)t[5] << 40) |
((uint64_t)t[4] << 32) |
((uint64_t)t[3] << 24) |
((uint64_t)t[2] << 16) |
((uint64_t)t[1] << 8) |
t[0];
}
#define EXTRACT_8BITS(p) EXTRACT_LE_8BITS(p)
#else /* Fast & Loose */
/*
* For 8-bit values; provided for the sake of completeness. Byte order
* isn't relevant, and alignment isn't an issue.
*/
#define EXTRACT_8BITS(p) (*(p))
#define EXTRACT_LE_8BITS(p) (*(p))
/*
* Inline functions or macros to extract possibly-unaligned big-endian
* integral values.
*/
#include "funcattrs.h"
#ifdef LBL_ALIGN
/*
* The processor doesn't natively handle unaligned loads.
*/
#if defined(__GNUC__) && defined(HAVE___ATTRIBUTE__) && \
(defined(__alpha) || defined(__alpha__) || \
defined(__mips) || defined(__mips__))
/*
* This is a GCC-compatible compiler and we have __attribute__, which
* we assume that mean we have __attribute__((packed)), and this is
* MIPS or Alpha, which has instructions that can help when doing
* unaligned loads.
*
* Declare packed structures containing a uint16_t and a uint32_t,
* cast the pointer to point to one of those, and fetch through it;
* the GCC manual doesn't appear to explicitly say that
* __attribute__((packed)) causes the compiler to generate unaligned-safe
* code, but it apppears to do so.
*
* We do this in case the compiler can generate code using those
* instructions to do an unaligned load and pass stuff to "ntohs()" or
* "ntohl()", which might be better than than the code to fetch the
* bytes one at a time and assemble them. (That might not be the
* case on a little-endian platform, such as DEC's MIPS machines and
* Alpha machines, where "ntohs()" and "ntohl()" might not be done
* inline.)
*
* We do this only for specific architectures because, for example,
* at least some versions of GCC, when compiling for 64-bit SPARC,
* generate code that assumes alignment if we do this.
*
* XXX - add other architectures and compilers as possible and
* appropriate.
*
* HP's C compiler, indicated by __HP_cc being defined, supports
* "#pragma unaligned N" in version A.05.50 and later, where "N"
* specifies a number of bytes at which the typedef on the next
* line is aligned, e.g.
*
* #pragma unalign 1
* typedef uint16_t unaligned_uint16_t;
*
* to define unaligned_uint16_t as a 16-bit unaligned data type.
* This could be presumably used, in sufficiently recent versions of
* the compiler, with macros similar to those below. This would be
* useful only if that compiler could generate better code for PA-RISC
* or Itanium than would be generated by a bunch of shifts-and-ORs.
*
* DEC C, indicated by __DECC being defined, has, at least on Alpha,
* an __unaligned qualifier that can be applied to pointers to get the
* compiler to generate code that does unaligned loads and stores when
* dereferencing the pointer in question.
*
* XXX - what if the native C compiler doesn't support
* __attribute__((packed))? How can we get it to generate unaligned
* accesses for *specific* items?
*/
typedef struct {
uint16_t val;
} __attribute__((packed)) unaligned_uint16_t;
typedef struct {
uint32_t val;
} __attribute__((packed)) unaligned_uint32_t;
UNALIGNED_OK static inline uint16_t
EXTRACT_16BITS(const void *p)
{
return ((uint16_t)ntohs(((const unaligned_uint16_t *)(p))->val));
}
UNALIGNED_OK static inline uint32_t
EXTRACT_32BITS(const void *p)
{
return ((uint32_t)ntohl(((const unaligned_uint32_t *)(p))->val));
}
UNALIGNED_OK static inline uint64_t
EXTRACT_64BITS(const void *p)
{
return ((uint64_t)(((uint64_t)ntohl(((const unaligned_uint32_t *)(p) + 0)->val)) << 32 |
((uint64_t)ntohl(((const unaligned_uint32_t *)(p) + 1)->val)) << 0));
}
#else /* have to do it a byte at a time */
/*
* This isn't a GCC-compatible compiler, we don't have __attribute__,
* or we do but we don't know of any better way with this instruction
* set to do unaligned loads, so do unaligned loads of big-endian
* quantities the hard way - fetch the bytes one at a time and
* assemble them.
*/
#define EXTRACT_16BITS(p) \
((uint16_t)(((uint16_t)(*((const uint8_t *)(p) + 0)) << 8) | \
((uint16_t)(*((const uint8_t *)(p) + 1)) << 0)))
#define EXTRACT_32BITS(p) \
((uint32_t)(((uint32_t)(*((const uint8_t *)(p) + 0)) << 24) | \
((uint32_t)(*((const uint8_t *)(p) + 1)) << 16) | \
((uint32_t)(*((const uint8_t *)(p) + 2)) << 8) | \
((uint32_t)(*((const uint8_t *)(p) + 3)) << 0)))
#define EXTRACT_64BITS(p) \
((uint64_t)(((uint64_t)(*((const uint8_t *)(p) + 0)) << 56) | \
((uint64_t)(*((const uint8_t *)(p) + 1)) << 48) | \
((uint64_t)(*((const uint8_t *)(p) + 2)) << 40) | \
((uint64_t)(*((const uint8_t *)(p) + 3)) << 32) | \
((uint64_t)(*((const uint8_t *)(p) + 4)) << 24) | \
((uint64_t)(*((const uint8_t *)(p) + 5)) << 16) | \
((uint64_t)(*((const uint8_t *)(p) + 6)) << 8) | \
((uint64_t)(*((const uint8_t *)(p) + 7)) << 0)))
#endif /* must special-case unaligned accesses */
#else /* LBL_ALIGN */
/*
* The processor natively handles unaligned loads, so we can just
* cast the pointer and fetch through it.
*/
static inline uint16_t UNALIGNED_OK
EXTRACT_16BITS(const void *p)
{
return ((uint16_t)ntohs(*(const uint16_t *)(p)));
}
static inline uint32_t UNALIGNED_OK
EXTRACT_32BITS(const void *p)
{
return ((uint32_t)ntohl(*(const uint32_t *)(p)));
}
static inline uint64_t UNALIGNED_OK
EXTRACT_64BITS(const void *p)
{
return ((uint64_t)(((uint64_t)ntohl(*((const uint32_t *)(p) + 0))) << 32 |
((uint64_t)ntohl(*((const uint32_t *)(p) + 1))) << 0));
}
#endif /* LBL_ALIGN */
#define EXTRACT_24BITS(p) \
((uint32_t)(((uint32_t)(*((const uint8_t *)(p) + 0)) << 16) | \
((uint32_t)(*((const uint8_t *)(p) + 1)) << 8) | \
((uint32_t)(*((const uint8_t *)(p) + 2)) << 0)))
#define EXTRACT_40BITS(p) \
((uint64_t)(((uint64_t)(*((const uint8_t *)(p) + 0)) << 32) | \
((uint64_t)(*((const uint8_t *)(p) + 1)) << 24) | \
((uint64_t)(*((const uint8_t *)(p) + 2)) << 16) | \
((uint64_t)(*((const uint8_t *)(p) + 3)) << 8) | \
((uint64_t)(*((const uint8_t *)(p) + 4)) << 0)))
#define EXTRACT_48BITS(p) \
((uint64_t)(((uint64_t)(*((const uint8_t *)(p) + 0)) << 40) | \
((uint64_t)(*((const uint8_t *)(p) + 1)) << 32) | \
((uint64_t)(*((const uint8_t *)(p) + 2)) << 24) | \
((uint64_t)(*((const uint8_t *)(p) + 3)) << 16) | \
((uint64_t)(*((const uint8_t *)(p) + 4)) << 8) | \
((uint64_t)(*((const uint8_t *)(p) + 5)) << 0)))
#define EXTRACT_56BITS(p) \
((uint64_t)(((uint64_t)(*((const uint8_t *)(p) + 0)) << 48) | \
((uint64_t)(*((const uint8_t *)(p) + 1)) << 40) | \
((uint64_t)(*((const uint8_t *)(p) + 2)) << 32) | \
((uint64_t)(*((const uint8_t *)(p) + 3)) << 24) | \
((uint64_t)(*((const uint8_t *)(p) + 4)) << 16) | \
((uint64_t)(*((const uint8_t *)(p) + 5)) << 8) | \
((uint64_t)(*((const uint8_t *)(p) + 6)) << 0)))
/*
* Macros to extract possibly-unaligned little-endian integral values.
* XXX - do loads on little-endian machines that support unaligned loads?
*/
#define EXTRACT_LE_16BITS(p) \
((uint16_t)(((uint16_t)(*((const uint8_t *)(p) + 1)) << 8) | \
((uint16_t)(*((const uint8_t *)(p) + 0)) << 0)))
#define EXTRACT_LE_32BITS(p) \
((uint32_t)(((uint32_t)(*((const uint8_t *)(p) + 3)) << 24) | \
((uint32_t)(*((const uint8_t *)(p) + 2)) << 16) | \
((uint32_t)(*((const uint8_t *)(p) + 1)) << 8) | \
((uint32_t)(*((const uint8_t *)(p) + 0)) << 0)))
#define EXTRACT_LE_24BITS(p) \
((uint32_t)(((uint32_t)(*((const uint8_t *)(p) + 2)) << 16) | \
((uint32_t)(*((const uint8_t *)(p) + 1)) << 8) | \
((uint32_t)(*((const uint8_t *)(p) + 0)) << 0)))
#define EXTRACT_LE_64BITS(p) \
((uint64_t)(((uint64_t)(*((const uint8_t *)(p) + 7)) << 56) | \
((uint64_t)(*((const uint8_t *)(p) + 6)) << 48) | \
((uint64_t)(*((const uint8_t *)(p) + 5)) << 40) | \
((uint64_t)(*((const uint8_t *)(p) + 4)) << 32) | \
((uint64_t)(*((const uint8_t *)(p) + 3)) << 24) | \
((uint64_t)(*((const uint8_t *)(p) + 2)) << 16) | \
((uint64_t)(*((const uint8_t *)(p) + 1)) << 8) | \
((uint64_t)(*((const uint8_t *)(p) + 0)) << 0)))
#endif /* __NetBSD__ */
/*
* Macros to check the presence of the values in question.
*/
#define ND_TTEST_8BITS(p) ND_TTEST2(*(p), 1)
#define ND_TCHECK_8BITS(p) ND_TCHECK2(*(p), 1)
#define ND_TTEST_16BITS(p) ND_TTEST2(*(p), 2)
#define ND_TCHECK_16BITS(p) ND_TCHECK2(*(p), 2)
#define ND_TTEST_24BITS(p) ND_TTEST2(*(p), 3)
#define ND_TCHECK_24BITS(p) ND_TCHECK2(*(p), 3)
#define ND_TTEST_32BITS(p) ND_TTEST2(*(p), 4)
#define ND_TCHECK_32BITS(p) ND_TCHECK2(*(p), 4)
#define ND_TTEST_40BITS(p) ND_TTEST2(*(p), 5)
#define ND_TCHECK_40BITS(p) ND_TCHECK2(*(p), 5)
#define ND_TTEST_48BITS(p) ND_TTEST2(*(p), 6)
#define ND_TCHECK_48BITS(p) ND_TCHECK2(*(p), 6)
#define ND_TTEST_56BITS(p) ND_TTEST2(*(p), 7)
#define ND_TCHECK_56BITS(p) ND_TCHECK2(*(p), 7)
#define ND_TTEST_64BITS(p) ND_TTEST2(*(p), 8)
#define ND_TCHECK_64BITS(p) ND_TCHECK2(*(p), 8)
#define ND_TTEST_128BITS(p) ND_TTEST2(*(p), 16)
#define ND_TCHECK_128BITS(p) ND_TCHECK2(*(p), 16)