From a91bfe2f55892f625d5a30171efa0fdfd2814abe Mon Sep 17 00:00:00 2001
From: Andy Polyakov <appro@openssl.org>
Date: Sun, 2 Apr 2017 22:00:15 +0200
Subject: [PATCH] crypto/ppccap.c: SIGILL-free processor capabilities detection
 on MacOS X.

It seems to be problematic to probe processor capabilities with SIGILL
on MacOS X. The problem should be limited to cases when application code
is debugged, but crashes were reported even during normal execution...

[backport of 0bd93bbe4ae60e5f318b298bfe617e468a7b71d0]

Reviewed-by: Rich Salz <rsalz@openssl.org>
---
 crypto/ppccap.c | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/crypto/ppccap.c b/crypto/ppccap.c
index 74af4732b5..60566b1a5f 100644
--- a/crypto/ppccap.c
+++ b/crypto/ppccap.c
@@ -7,6 +7,10 @@
 #if defined(__linux) || defined(_AIX)
 # include <sys/utsname.h>
 #endif
+#if defined(__APPLE__) && defined(__MACH__)
+# include <sys/types.h>
+# include <sys/sysctl.h>
+#endif
 #include <openssl/crypto.h>
 #include <openssl/bn.h>
 
@@ -123,6 +127,26 @@ void OPENSSL_cpuid_setup(void)
     }
 #endif
 
+#if defined(__APPLE__) && defined(__MACH__)
+    {
+        int val;
+        size_t len = sizeof(val);
+
+        if (sysctlbyname("hw.optional.64bitops", &val, &len, NULL, 0) == 0) {
+            if (val)
+                OPENSSL_ppccap_P |= PPC_FPU64;
+        }
+
+        len = sizeof(val);
+        if (sysctlbyname("hw.optional.altivec", &val, &len, NULL, 0) == 0) {
+            if (val)
+                OPENSSL_ppccap_P |= PPC_ALTIVEC;
+        }
+
+        return;
+    }
+#endif
+
     memset(&ill_act, 0, sizeof(ill_act));
     ill_act.sa_handler = ill_handler;
     ill_act.sa_mask = all_masked;
-- 
2.25.1