[test] Add self-tests for byte-order swapping functions

Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/tests/byteswap_test.c

@@ -0,0 +1,91 @@
+/*
+ * Copyright (C) 2012 Michael Brown <mbrown@fensystems.co.uk>.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER );
+
+/** @file
+ *
+ * Byte-order swapping test functions
+ *
+ */
+
+/* Forcibly enable assertions */
+#undef NDEBUG
+
+#include <stdint.h>
+#include <assert.h>
+#include <byteswap.h>
+#include <ipxe/test.h>
+
+/* Provide global functions to allow inspection of generated assembly code */
+
+uint16_t test_bswap16 ( uint16_t x ) {
+	return __bswap_16 ( x );
+}
+
+uint32_t test_bswap32 ( uint32_t x ) {
+	return __bswap_32 ( x );
+}
+
+uint64_t test_bswap64 ( uint64_t x ) {
+	return __bswap_64 ( x );
+}
+
+void test_bswap16s ( uint16_t *x ) {
+	__bswap_16s ( x );
+}
+
+void test_bswap32s ( uint32_t *x ) {
+	__bswap_32s ( x );
+}
+
+void test_bswap64s ( uint64_t *x ) {
+	__bswap_64s ( x );
+}
+
+/**
+ * Perform byte-order swapping
+ *
+ */
+static void byteswap_test_exec ( void ) {
+	uint16_t test16;
+	uint32_t test32;
+	uint64_t test64;
+
+	ok ( test_bswap16 ( 0x1234 ) == 0x3412 );
+	ok ( test_bswap32 ( 0x12345678UL ) == 0x78563412UL );
+	ok ( test_bswap64 ( 0x123456789abcdef0ULL ) == 0xf0debc9a78563412ULL );
+
+	test16 = 0xabcd;
+	test_bswap16s ( &test16 );
+	ok ( test16 == 0xcdab );
+
+	test32 = 0xabcdef01UL;
+	test_bswap32s ( &test32 );
+	ok ( test32 == 0x01efcdabUL );
+
+	test64 = 0xabcdef0123456789ULL;
+	test_bswap64s ( &test64 );
+	ok ( test64 == 0x8967452301efcdabULL );
+}
+
+/** Byte-order swapping self-test */
+struct self_test byteswap_test __self_test = {
+	.name = "byteswap",
+	.exec = byteswap_test_exec,
+};

src/tests/tests.c

@@ -26,6 +26,7 @@ FILE_LICENCE ( GPL2_OR_LATER );
 
 /* Drag in all applicable self-tests */
 REQUIRE_OBJECT ( list_test );
+REQUIRE_OBJECT ( byteswap_test );
 REQUIRE_OBJECT ( sha1_test );
 REQUIRE_OBJECT ( hmac_drbg_test );
 REQUIRE_OBJECT ( hash_df_test );