Get MASM output working on Win32.

We were building the NASM flavor with MASM which is why it didn't work. Get the
MASM output working: cpuid and cmove are not available in MASM unless the file
declares .686. Also work around MASM rejecting a very long line in SHA-256.

The follow-up change will get the NASM flavor working. We should probably use
that one as it's documented as supported upstream. But let's make this one
functional too.

Change-Id: Ica69cc042a7250c7bc9ba9325caab597cd4ce616
Reviewed-on: https://boringssl-review.googlesource.com/2091
Reviewed-by: Adam Langley <agl@google.com>

crypto/CMakeLists.txt

@@ -13,8 +13,8 @@ else()
 		message("Using masm")
 		set(PERLASM_STYLE masm)
 	else()
-		message("Using win32n")
-		set(PERLASM_STYLE win32n)
+		message("Using win32")
+		set(PERLASM_STYLE win32)
 	endif()
 	set(ASM_EXT asm)
 	enable_language(ASM_MASM)
@@ -27,9 +27,10 @@ function(perlasm dest src)
 		DEPENDS
 		${src}
 		${PROJECT_SOURCE_DIR}/crypto/perlasm/x86_64-xlate.pl
-		${PROJECT_SOURCE_DIR}/crypto/perlasm/x86gas.pl
-		${PROJECT_SOURCE_DIR}/crypto/perlasm/x86asm.pl
 		${PROJECT_SOURCE_DIR}/crypto/perlasm/x86asm.pl
+		${PROJECT_SOURCE_DIR}/crypto/perlasm/x86gas.pl
+		${PROJECT_SOURCE_DIR}/crypto/perlasm/x86masm.pl
+		${PROJECT_SOURCE_DIR}/crypto/perlasm/x86nasm.pl
 		WORKING_DIRECTORY .
 	)
 endfunction()

crypto/bn/generic.c

@@ -61,7 +61,7 @@
 #include "internal.h"
 
 
-#if defined(OPENSSL_WINDOWS) || defined(OPENSSL_NO_ASM) || \
+#if defined(OPENSSL_NO_ASM) || \
     (!defined(OPENSSL_X86_64) && !defined(OPENSSL_X86))
 
 #if defined(OPENSSL_WINDOWS)

crypto/perlasm/x86asm.pl

@@ -235,9 +235,9 @@ sub ::asciz
 
 sub ::asm_finish
 {   &file_end();
-    print "#if defined(__i386__)\n";
+    print "#if defined(__i386__)\n" unless $win32;
     print @out;
-    print "#endif\n";
+    print "#endif\n" unless $win32;
 }
 
 sub ::asm_init

crypto/perlasm/x86masm.pl

@@ -82,7 +82,7 @@ TITLE	$_[0].asm
 IF \@Version LT 800
 ECHO MASM version 8.00 or later is strongly recommended.
 ENDIF
-.486
+.686
 .MODEL	FLAT
 OPTION	DOTNAME
 IF \@Version LT 800
@@ -166,7 +166,10 @@ sub ::data_short
 {   push(@out,("DW\t").join(',',@_)."\n");	}
 
 sub ::data_word
-{   push(@out,("DD\t").join(',',@_)."\n");	}
+{   # MASM can't handle long lines, so emit one word at a time.
+    foreach(@_)
+    {	push(@out,"DD\t$_\n");	}
+}
 
 sub ::align
 {   push(@out,"ALIGN\t$_[0]\n");	}