diff options
| author | David Disseldorp <ddiss@samba.org> | 2014-05-05 13:42:36 +0200 |
|---|---|---|
| committer | David Disseldorp <ddiss@samba.org> | 2014-05-06 18:14:13 +0200 |
| commit | 5bf6ed5ebd0dc5ecdc5bcfb1d4720e9251849adc (patch) | |
| tree | 4a106cb3089b1112b27211e80de8de360fc7627e /lib/util/byteorder.h | |
| parent | 401f555c28aee861385b75c371b5f44cded1d391 (diff) | |
| download | samba-5bf6ed5ebd0dc5ecdc5bcfb1d4720e9251849adc.tar.gz | |
byteorder: do not assume PowerPC is big-endian
byteorder.h currently uses reverse-indexing ASM instructions for little
endian multi-byte storage/retrieval on PowerPC. With Power8 this is an
incorrect assumption, as it can be big or little endian.
Bug: https://bugzilla.samba.org/show_bug.cgi?id=10590
Signed-off-by: David Disseldorp <ddiss@samba.org>
Reviewed-by: Christof Schmitt <cs@samba.org>
Diffstat (limited to 'lib/util/byteorder.h')
| -rw-r--r-- | lib/util/byteorder.h | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/lib/util/byteorder.h b/lib/util/byteorder.h index 58cd68abf90..297be52ec3b 100644 --- a/lib/util/byteorder.h +++ b/lib/util/byteorder.h @@ -89,10 +89,12 @@ it also defines lots of intermediate macros, just ignore those :-) /* - on powerpc we can use the magic instructions to load/store - in little endian -*/ -#if (defined(__powerpc__) && defined(__GNUC__)) + * On powerpc we can use the magic instructions to load/store in little endian. + * The instructions are reverse-indexing, so assume a big endian Power + * processor. Power8 can be big or little endian, so we need to explicitly + * check. + */ +#if (defined(__powerpc__) && defined(__GNUC__) && HAVE_BIG_ENDIAN) static __inline__ uint16_t ld_le16(const uint16_t *addr) { uint16_t val; |