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BSD compatibility for <machine/endian.h>

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Introduce <machine/_endian.h> to let target based customization of
<machine/endian.h> via

 * _LITTLE_ENDIAN,
 * _BIG_ENDIAN,
 * _PDP_ENDIAN, and
 * _BYTE_ORDER.

defines.  Add definitions expected by FreeBSD to
<machine/endian.h> like

 * _QUAD_HIGHWORD,
 * _QUAD_LOWWORD,
 * __bswap16(),
 * __bswap32(),
 * __bswap64(),
 * __htonl(),
 * __htons(),
 * __ntohl(), and
 * __ntohs().

Also, if __BSD_VISIBLE

 * LITTLE_ENDIAN,
 * BIG_ENDIAN,
 * PDP_ENDIAN, and
 * BYTE_ORDER.

Targets that define __machine_host_to_from_network_defined in
<machine/_endian.h> must provide their own implementation of

 * __htonl(),
 * __htons(),
 * __ntohl(), and
 * __ntohs(),

otherwise a default implementation is provided by <machine/endian.h>.
In case of GCC defines to builtins are used.

Signed-off-by: Sebastian Huber <sebastian.huber@embedded-brains.de>
This commit is contained in:
Sebastian Huber
2016-04-18 15:29:21 +02:00
committed by Corinna Vinschen
parent 7a5b452443
commit 76a2110b47
6 changed files with 163 additions and 50 deletions
Download Patch File Download Diff File Expand all files Collapse all files

45
winsup/cygwin/include/machine/_endian.h Normal file
View File

@ -0,0 +1,45 @@
/* machine/_endian.h
Copyright 2005, 2010, 2011 Red Hat, Inc.
This file is part of Cygwin.
This software is a copyrighted work licensed under the terms of the
Cygwin license. Please consult the file "CYGWIN_LICENSE" for
details. */
#ifndef __MACHINE_ENDIAN_H__
#error "must be included via <machine/endian.h>"
#endif /* !__MACHINE_ENDIAN_H__ */
#include <_ansi.h>
#include <bits/endian.h>
#define _LITTLE_ENDIAN __LITTLE_ENDIAN
#define _BIG_ENDIAN __BIG_ENDIAN
#define _PDP_ENDIAN __PDP_ENDIAN
#define _BYTE_ORDER __BYTE_ORDER
#define __machine_host_to_from_network_defined
_ELIDABLE_INLINE __uint32_t __ntohl(__uint32_t);
_ELIDABLE_INLINE __uint16_t __ntohs(__uint16_t);
_ELIDABLE_INLINE __uint32_t
__ntohl(__uint32_t _x)
{
__asm__("bswap %0" : "=r" (_x) : "0" (_x));
return _x;
}
_ELIDABLE_INLINE __uint16_t
__ntohs(__uint16_t _x)
{
__asm__("xchgb %b0,%h0" /* swap bytes */
: "=Q" (_x)
: "0" (_x));
return _x;
}
#define __htonl(_x) __ntohl(_x)
#define __htons(_x) __ntohs(_x)