package/libs/mbedtls/patches/300-bn_mul.h-Use-optimized-MULADDC-code-only-on-ARM-6.patch


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From 7aff5a70f3580426865b6c86437a3e47546d13f7 Mon Sep 17 00:00:00 2001
From: Hauke Mehrtens <hauke@hauke-m.de>
Date: Sun, 16 Dec 2018 13:02:49 +0100
Subject: [PATCH] bn_mul.h: Use optimized MULADDC code only on ARM >= 6

The optimized code uses umaal which was only introduced with ARMv6 and
is not available on older versions.
This broke compilation with arm926ej-s CPU for me.

Fixes: 16b1bd89326 ("bn_mul.h: add ARM DSP optimized MULADDC code")
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
---
 include/mbedtls/bn_mul.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/include/mbedtls/bn_mul.h
+++ b/include/mbedtls/bn_mul.h
@@ -644,7 +644,8 @@
            "r6", "r7", "r8", "r9", "cc"         \
          );
 
-#elif defined (__ARM_FEATURE_DSP) && (__ARM_FEATURE_DSP == 1)
+#elif defined (__ARM_FEATURE_DSP) && (__ARM_FEATURE_DSP == 1) && \
+      __TARGET_ARCH_ARM >= 6
 
 #define MULADDC_INIT                            \
     asm(