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-rw-r--r--openssl/crypto/armcap.c80
1 files changed, 80 insertions, 0 deletions
diff --git a/openssl/crypto/armcap.c b/openssl/crypto/armcap.c
new file mode 100644
index 000000000..5258d2fbd
--- /dev/null
+++ b/openssl/crypto/armcap.c
@@ -0,0 +1,80 @@
+#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;
+
+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);
+unsigned int _armv7_tick(void);
+
+unsigned int OPENSSL_rdtsc(void)
+ {
+ if (OPENSSL_armcap_P|ARMV7_TICK)
+ return _armv7_tick();
+ else
+ return 0;
+ }
+
+#if defined(__GNUC__) && __GNUC__>=2
+void OPENSSL_cpuid_setup(void) __attribute__((constructor));
+#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=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 (sigsetjmp(ill_jmp,1) == 0)
+ {
+ _armv7_neon_probe();
+ OPENSSL_armcap_P |= ARMV7_NEON;
+ }
+ if (sigsetjmp(ill_jmp,1) == 0)
+ {
+ _armv7_tick();
+ OPENSSL_armcap_P |= ARMV7_TICK;
+ }
+
+ sigaction (SIGILL,&ill_oact,NULL);
+ sigprocmask(SIG_SETMASK,&oset,NULL);
+ }