[dpdk-dev] [PATCH v2 07/12] crypto/armv8: generate ASM symbols automatically

[<zbigniew.bodek@caviumnetworks.com>]

From: Zbigniew Bodek <zbigniew.bodek@caviumnetworks.com>

In order to acquire crypto_arg structure fields
from the assembly code it is necessary to generate
macros that will define offsets to those fields
during app build. This will allow for free
crypto_arg structure modifications in the future
without the necessity to make similar changes
for the assembly code.

Introduce genassym.c file that will be used
to generate phony assembly code containing pattern
followed by field offset value. Use awk to create
"define NAME value" sequence in the newly created
assym.s file.

Signed-off-by: Zbigniew Bodek <zbigniew.bodek@caviumnetworks.com>
---
 drivers/crypto/armv8/Makefile   | 12 +++++++++
 drivers/crypto/armv8/genassym.c | 55 +++++++++++++++++++++++++++++++++++++++++
 2 files changed, 67 insertions(+)
 create mode 100644 drivers/crypto/armv8/genassym.c

diff --git a/drivers/crypto/armv8/Makefile b/drivers/crypto/armv8/Makefile
index 2d053a4..8fdd374 100644
--- a/drivers/crypto/armv8/Makefile
+++ b/drivers/crypto/armv8/Makefile
@@ -69,4 +69,16 @@ DEPDIRS-$(CONFIG_RTE_LIBRTE_PMD_ARMV8_CRYPTO) += lib/librte_mempool
 DEPDIRS-$(CONFIG_RTE_LIBRTE_PMD_ARMV8_CRYPTO) += lib/librte_ring
 DEPDIRS-$(CONFIG_RTE_LIBRTE_PMD_ARMV8_CRYPTO) += lib/librte_cryptodev
 
+# runtime generated assembly symbols
+all: clean assym.s
+
+assym.s: genassym.c
+	@$(CC) $(CFLAGS) -O0 -S $< -o - | \
+		awk '($$1 == "<genassym>") { print "#define " $$2 "\t" $$3 }' > \
+		$(SRCDIR)/asm/$@
+
+.PHONY:	clean
+clean:
+	@rm -f $(SRCDIR)/asm/assym.s
+
 include $(RTE_SDK)/mk/rte.lib.mk
diff --git a/drivers/crypto/armv8/genassym.c b/drivers/crypto/armv8/genassym.c
new file mode 100644
index 0000000..44604ce
--- /dev/null
+++ b/drivers/crypto/armv8/genassym.c
@@ -0,0 +1,55 @@
+/*
+ *   BSD LICENSE
+ *
+ *   Copyright (C) Cavium networks Ltd. 2016.
+ *
+ *   Redistribution and use in source and binary forms, with or without
+ *   modification, are permitted provided that the following conditions
+ *   are met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in
+ *       the documentation and/or other materials provided with the
+ *       distribution.
+ *     * Neither the name of Cavium networks nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <rte_common.h>
+
+#include "rte_armv8_defs.h"
+
+#define	ASSYM(name, offset)						\
+do {									\
+	asm volatile("----------\n");					\
+	/* Place pattern, name + value in the assembly code */		\
+	asm volatile("\n<genassym> " #name " %0\n" :: "i" (offset));	\
+} while (0)
+
+
+static void __rte_unused
+generate_as_symbols(void)
+{
+
+	ASSYM(CIPHER_KEY, offsetof(struct crypto_arg, cipher.key));
+	ASSYM(CIPHER_IV, offsetof(struct crypto_arg, cipher.iv));
+
+	ASSYM(HMAC_KEY, offsetof(struct crypto_arg, digest.hmac.key));
+	ASSYM(HMAC_IKEYPAD, offsetof(struct crypto_arg, digest.hmac.i_key_pad));
+	ASSYM(HMAC_OKEYPAD, offsetof(struct crypto_arg, digest.hmac.o_key_pad));
+}
-- 
1.9.1