diff options
author | Dan Shumow <shumow@gmail.com> | 2017-06-28 02:09:04 +0300 |
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committer | GitHub <noreply@github.com> | 2017-06-28 02:09:04 +0300 |
commit | 3f14d1bbe2724610f25befff15c4899903182428 (patch) | |
tree | 6ec87206563d2c827455d7491c97320fd0ac1ccf | |
parent | e1399840b501a68ac6c8d7ed9a5cb1455480200e (diff) | |
parent | 9d3a0b3783afab335a1819543d039cf2980577bb (diff) |
Merge pull request #36 from avar/bigend-detect-solaris-again
Fix BigEndian detection in a more robust way.
-rw-r--r-- | lib/sha1.c | 73 |
1 files changed, 54 insertions, 19 deletions
@@ -23,6 +23,13 @@ #include "sha1.h" #include "ubc_check.h" +#if (defined(__amd64__) || defined(__amd64) || defined(__x86_64__) || defined(__x86_64) || \ + defined(i386) || defined(__i386) || defined(__i386__) || defined(__i486__) || \ + defined(__i586__) || defined(__i686__) || defined(_M_IX86) || defined(__X86__) || \ + defined(_X86_) || defined(__THW_INTEL__) || defined(__I86__) || defined(__INTEL__) || \ + defined(__386) || defined(_M_X64) || defined(_M_AMD64)) +#define SHA1DC_ON_INTEL_LIKE_PROCESSOR +#endif /* Because Little-Endian architectures are most common, @@ -32,28 +39,63 @@ If you are compiling on a big endian platform and your compiler does not define one of these, you will have to add whatever macros your tool chain defines to indicate Big-Endianness. */ -#ifdef SHA1DC_BIGENDIAN -#undef SHA1DC_BIGENDIAN + +#if defined(__BYTE_ORDER__) && defined(__ORDER_BIG_ENDIAN__) +/* + * Should detect Big Endian under GCC since at least 4.6.0 (gcc svn + * rev #165881). See + * https://gcc.gnu.org/onlinedocs/cpp/Common-Predefined-Macros.html + * + * This also works under clang since 3.2, it copied the GCC-ism. See + * clang.git's 3b198a97d2 ("Preprocessor: add __BYTE_ORDER__ + * predefined macro", 2012-07-27) + */ +#if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__ +#define SHA1DC_BIGENDIAN #endif -#if (defined(_BYTE_ORDER) || defined(__BYTE_ORDER) || defined(__BYTE_ORDER__)) +#else /* Not under GCC-alike */ -#if ((defined(_BYTE_ORDER) && (_BYTE_ORDER == _BIG_ENDIAN)) || \ - (defined(__BYTE_ORDER) && (__BYTE_ORDER == __BIG_ENDIAN)) || \ - (defined(__BYTE_ORDER__) && (__BYTE_ORDER__ == __BIG_ENDIAN__)) ) +#if defined(__BYTE_ORDER) && defined(__BIG_ENDIAN) +/* + * Should detect Big Endian under glibc.git since 14245eb70e ("entered + * into RCS", 1992-11-25). Defined in <endian.h> which will have been + * brought in by standard headers. See glibc.git and + * https://sourceforge.net/p/predef/wiki/Endianness/ + */ +#if __BYTE_ORDER == __BIG_ENDIAN #define SHA1DC_BIGENDIAN #endif -#else +#else /* Not under GCC-alike or glibc */ -#if (defined(_BIG_ENDIAN) || defined(__BIG_ENDIAN) || defined(__BIG_ENDIAN__) || \ - defined(__ARMEB__) || defined(__THUMBEB__) || defined(__AARCH64EB__) || \ +#if (defined(__ARMEB__) || defined(__THUMBEB__) || defined(__AARCH64EB__) || \ defined(__MIPSEB__) || defined(__MIPSEB) || defined(_MIPSEB) || \ defined(__sparc)) +/* + * Should define Big Endian for a whitelist of known processors. See + * https://sourceforge.net/p/predef/wiki/Endianness/ and + * http://www.oracle.com/technetwork/server-storage/solaris/portingtosolaris-138514.html + */ #define SHA1DC_BIGENDIAN -#endif -#endif +#else /* Not under GCC-alike or glibc or <processor whitelist> */ + +#if defined(SHA1DC_ON_INTEL_LIKE_PROCESSOR) +/* + * As a last resort before we do anything else we're not 100% sure + * about below, we blacklist specific processors here. We could add + * more, see e.g. https://wiki.debian.org/ArchitectureSpecificsMemo + */ +#else /* Not under GCC-alike or glibc or <processor whitelist> or <processor blacklist> */ + +/* We do nothing more here for now */ +/*#error "Uncomment this to see if you fall through all the detection"*/ + +#endif /* !SHA1DC_ON_INTEL_LIKE_PROCESSOR */ +#endif /* Big Endian under whitelist of processors */ +#endif /* Big Endian under glibc */ +#endif /* Big Endian under GCC-alike */ #if (defined(SHA1DC_FORCE_LITTLEENDIAN) && defined(SHA1DC_BIGENDIAN)) #undef SHA1DC_BIGENDIAN @@ -63,15 +105,8 @@ #endif /*ENDIANNESS SELECTION*/ -#if (defined SHA1DC_FORCE_UNALIGNED_ACCESS || \ - defined(__amd64__) || defined(__amd64) || defined(__x86_64__) || defined(__x86_64) || \ - defined(i386) || defined(__i386) || defined(__i386__) || defined(__i486__) || \ - defined(__i586__) || defined(__i686__) || defined(_M_IX86) || defined(__X86__) || \ - defined(_X86_) || defined(__THW_INTEL__) || defined(__I86__) || defined(__INTEL__) || \ - defined(__386) || defined(_M_X64) || defined(_M_AMD64)) - +#if defined(SHA1DC_FORCE_UNALIGNED_ACCESS) || defined(SHA1DC_ON_INTEL_LIKE_PROCESSOR) #define SHA1DC_ALLOW_UNALIGNED_ACCESS - #endif /*UNALIGNMENT DETECTION*/ |