First Commit

externals/cryptopp/power9_ppc.cpp

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+// ppc_power9.cpp - written and placed in the public domain by
+//                  Jeffrey Walton, Uri Blumenthal and Marcel Raad.
+//
+//    This source file uses intrinsics and built-ins to gain access to
+//    Power9 instructions. A separate source file is needed because
+//    additional CXXFLAGS are required to enable the appropriate
+//    instructions sets in some build configurations.
+
+#include "pch.h"
+#include "config.h"
+
+#ifdef CRYPTOPP_GNU_STYLE_INLINE_ASSEMBLY
+# include <signal.h>
+# include <setjmp.h>
+#endif
+
+#if defined(_ARCH_PWR9)
+# include "ppc_simd.h"
+#endif
+
+// Squash MS LNK4221 and libtool warnings
+extern const char PPC_POWER9_FNAME[] = __FILE__;
+
+NAMESPACE_BEGIN(CryptoPP)
+
+// ************************* Feature Probes ************************* //
+
+#ifdef CRYPTOPP_GNU_STYLE_INLINE_ASSEMBLY
+extern "C" {
+    typedef void (*SigHandler)(int);
+
+    static jmp_buf s_jmpSIGILL;
+    static void SigIllHandler(int)
+    {
+        longjmp(s_jmpSIGILL, 1);
+    }
+}
+#endif  // CRYPTOPP_MS_STYLE_INLINE_ASSEMBLY
+
+#if (CRYPTOPP_BOOL_PPC32 || CRYPTOPP_BOOL_PPC64)
+
+bool CPU_ProbePower9()
+{
+#if defined(CRYPTOPP_NO_CPU_FEATURE_PROBES)
+    return false;
+#elif defined(CRYPTOPP_POWER9_AVAILABLE)
+# if defined(CRYPTOPP_GNU_STYLE_INLINE_ASSEMBLY)
+    // longjmp and clobber warnings. Volatile is required.
+    // http://github.com/weidai11/cryptopp/issues/24 and http://stackoverflow.com/q/7721954
+    volatile int result = true;
+
+    volatile SigHandler oldHandler = signal(SIGILL, SigIllHandler);
+    if (oldHandler == SIG_ERR)
+        return false;
+
+    volatile sigset_t oldMask;
+    if (sigprocmask(0, NULLPTR, (sigset_t*)&oldMask))
+    {
+        signal(SIGILL, oldHandler);
+        return false;
+    }
+
+    if (setjmp(s_jmpSIGILL))
+        result = false;
+    else
+    {
+        // This is "darn r3, 0" from POWER9. We cannot use __builtin_darn
+        // and friends because Clang and IBM XL C/C++ does not offer them.
+#if CRYPTOPP_BIG_ENDIAN
+        __asm__ __volatile__ (".byte 0x7c, 0x60, 0x05, 0xe6  \n" : : : "r3");
+#else
+        __asm__ __volatile__ (".byte 0xe6, 0x05, 0x60, 0x7c  \n" : : : "r3");
+#endif
+        result = true;
+    }
+
+    sigprocmask(SIG_SETMASK, (sigset_t*)&oldMask, NULLPTR);
+    signal(SIGILL, oldHandler);
+    return result;
+# endif
+#else
+    return false;
+#endif  // _ARCH_PWR9
+}
+
+// The DARN probe is not guarded with a preprocessor macro at the moment. We
+// don't use CRYPTOPP_POWER9_AVAILABLE because old compilers, like GCC 4.8 on
+// CentOS 7, will report NO even though we can produce the random numbers.
+// Other Power9 implementations which use builtins will use the preprocessor
+// macro guard. This strategy also gets into a situation where Power9 is not
+// available but DARN is.
+bool CPU_ProbeDARN()
+{
+#if defined(CRYPTOPP_NO_CPU_FEATURE_PROBES)
+    return false;
+#else
+# if defined(CRYPTOPP_GNU_STYLE_INLINE_ASSEMBLY)
+    // longjmp and clobber warnings. Volatile is required.
+    // http://github.com/weidai11/cryptopp/issues/24 and http://stackoverflow.com/q/7721954
+    volatile int result = true;
+
+    volatile SigHandler oldHandler = signal(SIGILL, SigIllHandler);
+    if (oldHandler == SIG_ERR)
+        return false;
+
+    volatile sigset_t oldMask;
+    if (sigprocmask(0, NULLPTR, (sigset_t*)&oldMask))
+    {
+        signal(SIGILL, oldHandler);
+        return false;
+    }
+
+    if (setjmp(s_jmpSIGILL))
+        result = false;
+    else
+    {
+        // This is "darn r3, 0" from POWER9. We cannot use __builtin_darn
+        // and friends because Clang and IBM XL C/C++ does not offer them.
+#if CRYPTOPP_BIG_ENDIAN
+        __asm__ __volatile__ (".byte 0x7c, 0x60, 0x05, 0xe6  \n" : : : "r3");
+#else
+        __asm__ __volatile__ (".byte 0xe6, 0x05, 0x60, 0x7c  \n" : : : "r3");
+#endif
+        result = true;
+    }
+
+    sigprocmask(SIG_SETMASK, (sigset_t*)&oldMask, NULLPTR);
+    signal(SIGILL, oldHandler);
+    return result;
+# endif
+#endif  // DARN
+}
+
+#endif  // PPC32 or PPC64
+
+NAMESPACE_END