Merge remote-tracking branch 'origin/pr/1949' into development

ChangeLog

@@ -26,6 +26,11 @@ Changes
    * Provide an abstraction of vsnprintf to allow alternative implementations
      for platforms that don't provide it. Based on contributions by Joris Aerts
      and Nathaniel Wesley Filardo.
+   * Fix clobber list in MIPS assembly for large integer multiplication.
+     Previously, this could lead to functionally incorrect assembly being
+     produced by some optimizing compilers, showing up as failures in
+     e.g. RSA or ECC signature operations. Reported in #1722, fix suggested
+     by Aurelien Jarno and submitted by Jeffrey Martin.
 
 = mbed TLS 2.16.0 branch released 2018-12-21
 

include/mbedtls/bn_mul.h

@@ -756,7 +756,7 @@
         "sw     $10, %2         \n\t"   \
         : "=m" (c), "=m" (d), "=m" (s)                      \
         : "m" (s), "m" (d), "m" (c), "m" (b)                \
-        : "$9", "$10", "$11", "$12", "$13", "$14", "$15"    \
+        : "$9", "$10", "$11", "$12", "$13", "$14", "$15", "lo", "hi" \
     );
 
 #endif /* MIPS */