Initial Commit

openssl-1.0.2f/crypto/armcap.c

@@ -0,0 +1,164 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <setjmp.h>
+#include <signal.h>
+#include <crypto.h>
+
+#include "arm_arch.h"
+
+unsigned int OPENSSL_armcap_P = 0;
+
+#if __ARM_MAX_ARCH__<7
+void OPENSSL_cpuid_setup(void)
+{
+}
+
+unsigned long OPENSSL_rdtsc(void)
+{
+    return 0;
+}
+#else
+static sigset_t all_masked;
+
+static sigjmp_buf ill_jmp;
+static void ill_handler(int sig)
+{
+    siglongjmp(ill_jmp, sig);
+}
+
+/*
+ * Following subroutines could have been inlined, but it's not all
+ * ARM compilers support inline assembler...
+ */
+void _armv7_neon_probe(void);
+void _armv8_aes_probe(void);
+void _armv8_sha1_probe(void);
+void _armv8_sha256_probe(void);
+void _armv8_pmull_probe(void);
+unsigned long _armv7_tick(void);
+
+unsigned long OPENSSL_rdtsc(void)
+{
+    if (OPENSSL_armcap_P & ARMV7_TICK)
+        return _armv7_tick();
+    else
+        return 0;
+}
+
+/*
+ * Use a weak reference to getauxval() so we can use it if it is available but
+ * don't break the build if it is not.
+ */
+# if defined(__GNUC__) && __GNUC__>=2
+void OPENSSL_cpuid_setup(void) __attribute__ ((constructor));
+extern unsigned long getauxval(unsigned long type) __attribute__ ((weak));
+# else
+static unsigned long (*getauxval) (unsigned long) = NULL;
+# endif
+
+/*
+ * ARM puts the the feature bits for Crypto Extensions in AT_HWCAP2, whereas
+ * AArch64 used AT_HWCAP.
+ */
+# if defined(__arm__) || defined (__arm)
+#  define HWCAP                  16
+                                  /* AT_HWCAP */
+#  define HWCAP_NEON             (1 << 12)
+
+#  define HWCAP_CE               26
+                                  /* AT_HWCAP2 */
+#  define HWCAP_CE_AES           (1 << 0)
+#  define HWCAP_CE_PMULL         (1 << 1)
+#  define HWCAP_CE_SHA1          (1 << 2)
+#  define HWCAP_CE_SHA256        (1 << 3)
+# elif defined(__aarch64__)
+#  define HWCAP                  16
+                                  /* AT_HWCAP */
+#  define HWCAP_NEON             (1 << 1)
+
+#  define HWCAP_CE               HWCAP
+#  define HWCAP_CE_AES           (1 << 3)
+#  define HWCAP_CE_PMULL         (1 << 4)
+#  define HWCAP_CE_SHA1          (1 << 5)
+#  define HWCAP_CE_SHA256        (1 << 6)
+# endif
+
+void OPENSSL_cpuid_setup(void)
+{
+    char *e;
+    struct sigaction ill_oact, ill_act;
+    sigset_t oset;
+    static int trigger = 0;
+
+    if (trigger)
+        return;
+    trigger = 1;
+
+    if ((e = getenv("OPENSSL_armcap"))) {
+        OPENSSL_armcap_P = (unsigned int)strtoul(e, NULL, 0);
+        return;
+    }
+
+    sigfillset(&all_masked);
+    sigdelset(&all_masked, SIGILL);
+    sigdelset(&all_masked, SIGTRAP);
+    sigdelset(&all_masked, SIGFPE);
+    sigdelset(&all_masked, SIGBUS);
+    sigdelset(&all_masked, SIGSEGV);
+
+    OPENSSL_armcap_P = 0;
+
+    memset(&ill_act, 0, sizeof(ill_act));
+    ill_act.sa_handler = ill_handler;
+    ill_act.sa_mask = all_masked;
+
+    sigprocmask(SIG_SETMASK, &ill_act.sa_mask, &oset);
+    sigaction(SIGILL, &ill_act, &ill_oact);
+
+    if (getauxval != NULL) {
+        if (getauxval(HWCAP) & HWCAP_NEON) {
+            unsigned long hwcap = getauxval(HWCAP_CE);
+
+            OPENSSL_armcap_P |= ARMV7_NEON;
+
+            if (hwcap & HWCAP_CE_AES)
+                OPENSSL_armcap_P |= ARMV8_AES;
+
+            if (hwcap & HWCAP_CE_PMULL)
+                OPENSSL_armcap_P |= ARMV8_PMULL;
+
+            if (hwcap & HWCAP_CE_SHA1)
+                OPENSSL_armcap_P |= ARMV8_SHA1;
+
+            if (hwcap & HWCAP_CE_SHA256)
+                OPENSSL_armcap_P |= ARMV8_SHA256;
+        }
+    } else if (sigsetjmp(ill_jmp, 1) == 0) {
+        _armv7_neon_probe();
+        OPENSSL_armcap_P |= ARMV7_NEON;
+        if (sigsetjmp(ill_jmp, 1) == 0) {
+            _armv8_pmull_probe();
+            OPENSSL_armcap_P |= ARMV8_PMULL | ARMV8_AES;
+        } else if (sigsetjmp(ill_jmp, 1) == 0) {
+            _armv8_aes_probe();
+            OPENSSL_armcap_P |= ARMV8_AES;
+        }
+        if (sigsetjmp(ill_jmp, 1) == 0) {
+            _armv8_sha1_probe();
+            OPENSSL_armcap_P |= ARMV8_SHA1;
+        }
+        if (sigsetjmp(ill_jmp, 1) == 0) {
+            _armv8_sha256_probe();
+            OPENSSL_armcap_P |= ARMV8_SHA256;
+        }
+    }
+    if (sigsetjmp(ill_jmp, 1) == 0) {
+        _armv7_tick();
+        OPENSSL_armcap_P |= ARMV7_TICK;
+    }
+
+    sigaction(SIGILL, &ill_oact, NULL);
+    sigprocmask(SIG_SETMASK, &oset, NULL);
+}
+#endif