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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
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24
winsup/cygwin/include/asm/byteorder.h
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@ -11,9 +11,8 @@ details. */
#ifndef _I386_BYTEORDER_H
#define _I386_BYTEORDER_H
#include <_ansi.h>
#include <stdint.h>
#include <bits/endian.h>
#include <machine/endian.h>
#ifdef __cplusplus
extern "C" {
@ -28,37 +27,16 @@ extern uint16_t ntohs(uint16_t);
extern uint32_t htonl(uint32_t);
extern uint16_t htons(uint16_t);
_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;
}
#define __constant_ntohl(x) \
((uint32_t)((((uint32_t)(x) & 0x000000ffU) << 24) | \
(((uint32_t)(x) & 0x0000ff00U) << 8) | \
(((uint32_t)(x) & 0x00ff0000U) >> 8) | \
(((uint32_t)(x) & 0xff000000U) >> 24)))
_ELIDABLE_INLINE uint16_t
__ntohs(uint16_t x)
{
__asm__("xchgb %b0,%h0" /* swap bytes */
: "=Q" (x)
: "0" (x));
return x;
}
#define __constant_ntohs(x) \
((uint16_t)((((uint16_t)(x) & 0x00ff) << 8) | \
(((uint16_t)(x) & 0xff00) >> 8))) \
#define __htonl(x) __ntohl(x)
#define __htons(x) __ntohs(x)
#define __constant_htonl(x) __constant_ntohl(x)
#define __constant_htons(x) __constant_ntohs(x)