msys: detects crc/cryptosupport on FreeBSD/arm

closes #1737

Reviewers: Marko Mäkelä, Krunal Bauskar

mysys/CMakeLists.txt

@@ -86,7 +86,14 @@ ELSEIF(CMAKE_SYSTEM_PROCESSOR MATCHES "aarch64|AARCH64")
       return ret;
     }
     #include <sys/auxv.h>
-    int main() { foo(0); getauxval(AT_HWCAP); }" HAVE_ARMV8_CRC)
+    int main() { foo(0);
+    #ifdef __linux__
+    getauxval(AT_HWCAP);
+    #else
+    unsigned long v;
+    elf_aux_info(AT_HWCAP, &v, sizeof(v));
+    #endif
+    }" HAVE_ARMV8_CRC)
 
     CHECK_CXX_SOURCE_COMPILES("
     asm(\".arch_extension crypto\");
@@ -95,7 +102,14 @@ ELSEIF(CMAKE_SYSTEM_PROCESSOR MATCHES "aarch64|AARCH64")
       return ret;
     }
     #include <sys/auxv.h>
-    int main() { foo(0); getauxval(AT_HWCAP); }" HAVE_ARMV8_CRYPTO)
+    int main() { foo(0);
+    #ifdef __linux__
+    getauxval(AT_HWCAP);
+    #else
+    unsigned long v;
+    elf_aux_info(AT_HWCAP, &v, sizeof(v));
+    #endif
+    }" HAVE_ARMV8_CRYPTO)
 
     CHECK_C_COMPILER_FLAG(-march=armv8-a+crc+crypto HAVE_ARMV8_CRC_CRYPTO_MARCH)
 

mysys/crc32/crc32_arm64.c

@@ -2,10 +2,20 @@
 #include <string.h>
 #include <stdint.h>
 
-#if defined(__GNUC__) && defined(HAVE_ARMV8_CRC)
+#if defined(HAVE_ARMV8_CRC)
 
 #include <sys/auxv.h>
-#include <asm/hwcap.h>
+#if defined(__FreeBSD__)
+static unsigned long getauxval(unsigned int key)
+{
+  unsigned long val;
+  if (elf_aux_info(key, (void *)&val, (int)sizeof(val) != 0)
+    return 0ul;
+  return val;
+}
+#else
+# include <asm/hwcap.h>
+#endif
 
 #ifndef HWCAP_CRC32
 # define HWCAP_CRC32 (1 << 7)
@@ -40,7 +50,7 @@ const char *crc32c_aarch64_available(void)
     return "Using ARMv8 crc32 instructions";
 }
 
-#endif /* __GNUC__ && HAVE_ARMV8_CRC */
+#endif /* HAVE_ARMV8_CRC */
 
 #ifndef HAVE_ARMV8_CRC_CRYPTO_INTRINSICS