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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

17
newlib/libc/machine/arm/machine/endian.h → newlib/libc/machine/arm/machine/_endian.h
View File

@ -24,17 +24,16 @@
NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
#ifndef _MACHINE_ENDIAN_H
#define _MACHINE_ENDIAN_H
#ifndef __MACHINE_ENDIAN_H__
#error "must be included via <machine/endian.h>"
#endif /* !__MACHINE_ENDIAN_H__ */
/* Code relocated from libc/sys/arm/sys/param.h. */
#define BIG_ENDIAN 4321
#define LITTLE_ENDIAN 1234
#define _LITTLE_ENDIAN 1234
#define _BIG_ENDIAN 4321
#define _PDP_ENDIAN 3412
#ifdef __ARMEB__
#define BYTE_ORDER BIG_ENDIAN
#define _BYTE_ORDER _BIG_ENDIAN
#else
#define BYTE_ORDER LITTLE_ENDIAN
#endif
#define _BYTE_ORDER _LITTLE_ENDIAN
#endif