FIX fp_generic.c

Change-Id: Ic2498acd3f4f56a4d45c91c1d676a19297e42741

crypto/CMakeLists.txt

@@ -411,6 +411,7 @@ add_library(
   ../third_party/sike/isogeny.c
   ../third_party/sike/P503.c
   ../third_party/sike/sike.c
+  ../third_party/sike/asm/fp_generic.c
   $<TARGET_OBJECTS:fipsmodule>
 
   ${CRYPTO_ARCH_SOURCES}

third_party/sike/asm/fp-x86_64.pl

@@ -97,6 +97,7 @@ ___
 }
 
 # Compute z = x + y (mod p).
+# Operation: c [rdx] = a [rdi] + b [rsi]
 $code.=<<___;
 .globl  ${PREFIX}_fpadd
 .type   ${PREFIX}_fpadd,\@function,3
@@ -224,6 +225,7 @@ sub cswap_block16() {
 
 # Conditionally swaps bits in x and y in constant time.
 # mask indicates bits to be swapped (set bits are swapped)
+# Operation: [rdi] <-> [rsi] if rdx==1
 sub cswap {
   # P[0].X with Q[0].X
   foreach ( 0.. 3){$BLOCKS.=eval "&cswap_block16($_)";}

third_party/sike/asm/fp_generic.c

@@ -4,6 +4,8 @@
 * Abstract: portable modular arithmetic for P503
 *********************************************************************************************/
 
+#include <openssl/base.h>
+
 #if defined(OPENSSL_NO_ASM) || \
     (!defined(OPENSSL_X86_64) && !defined(OPENSSL_AARCH64))