First Commit

externals/cryptopp/ppc_simd.cpp

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+// ppc_simd.cpp - written and placed in the public domain by
+//                Jeffrey Walton, Uri Blumenthal and Marcel Raad.
+//
+//    This source file uses intrinsics to gain access to AltiVec,
+//    Power8 and in-core crypto 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"
+#include "stdcpp.h"
+
+#if defined(CRYPTOPP_ALTIVEC_AVAILABLE)
+# include "ppc_simd.h"
+#endif
+
+#ifdef CRYPTOPP_GNU_STYLE_INLINE_ASSEMBLY
+# include <signal.h>
+# include <setjmp.h>
+#endif
+
+#ifndef EXCEPTION_EXECUTE_HANDLER
+# define EXCEPTION_EXECUTE_HANDLER 1
+#endif
+
+// Squash MS LNK4221 and libtool warnings
+extern const char PPC_SIMD_FNAME[] = __FILE__;
+
+NAMESPACE_BEGIN(CryptoPP)
+
+#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  // Not CRYPTOPP_MS_STYLE_INLINE_ASSEMBLY
+
+#if (CRYPTOPP_BOOL_PPC32 || CRYPTOPP_BOOL_PPC64)
+bool CPU_ProbeAltivec()
+{
+#if defined(CRYPTOPP_NO_CPU_FEATURE_PROBES)
+    return false;
+#elif (_ARCH_PWR3) && (CRYPTOPP_ALTIVEC_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/7721854
+    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
+    {
+        CRYPTOPP_ALIGN_DATA(16)
+        const byte b1[16] = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
+        CRYPTOPP_ALIGN_DATA(16)
+        const byte b2[16] = {1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1};
+        CRYPTOPP_ALIGN_DATA(16) byte b3[16];
+
+        // Specifically call the Altivec loads and stores
+        const uint8x16_p v1 = (uint8x16_p)vec_ld(0, (byte*)b1);
+        const uint8x16_p v2 = (uint8x16_p)vec_ld(0, (byte*)b2);
+        const uint8x16_p v3 = (uint8x16_p)VecXor(v1, v2);
+        vec_st(v3, 0, b3);
+
+        result = (0 == std::memcmp(b2, b3, 16));
+    }
+
+    sigprocmask(SIG_SETMASK, (sigset_t*)&oldMask, NULLPTR);
+    signal(SIGILL, oldHandler);
+    return result;
+# endif
+#else
+    return false;
+#endif  // CRYPTOPP_ALTIVEC_AVAILABLE
+}
+
+# endif  // CRYPTOPP_BOOL_PPC32 || CRYPTOPP_BOOL_PPC64
+
+NAMESPACE_END