From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from smtp.tuxdriver.com (charlotte.tuxdriver.com [70.61.120.58]) by dpdk.org (Postfix) with ESMTP id D10047E18 for ; Mon, 29 Sep 2014 17:37:43 +0200 (CEST) Received: from hmsreliant.think-freely.org ([2001:470:8:a08:7aac:c0ff:fec2:933b] helo=localhost) by smtp.tuxdriver.com with esmtpsa (TLSv1:AES128-SHA:128) (Exim 4.63) (envelope-from ) id 1XYd7S-0004i8-4E; Mon, 29 Sep 2014 11:44:17 -0400 From: Neil Horman To: dev@dpdk.org Date: Mon, 29 Sep 2014 11:44:03 -0400 Message-Id: <1412005443-20000-1-git-send-email-nhorman@tuxdriver.com> X-Mailer: git-send-email 1.9.3 In-Reply-To: <1410809031-19114-2-git-send-email-nhorman@tuxdriver.com> References: <1410809031-19114-2-git-send-email-nhorman@tuxdriver.com> X-Spam-Score: -2.9 (--) X-Spam-Status: No Subject: [dpdk-dev] [PATCH 1/4 v3] compat: Add infrastructure to support symbol versioning X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: patches and discussions about DPDK List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 29 Sep 2014 15:37:44 -0000 Add initial pass header files to support symbol versioning. --- Change notes v2) * Fixed ifdef in rte_compat.h to test for RTE_BUILD_SHARED_LIB instead of the non-existant RTE_SYMBOL_VERSIONING * Fixed VERSION_SYMBOL macro to add the needed extra @ to make versioning work properly * Improved/Clarified documentation v3) * Added missing macros to fully export the symver directive specification Signed-off-by: Neil Horman CC: Thomas Monjalon CC: "Richardson, Bruce" CC: "Gonzalez Monroy, Sergio" --- lib/Makefile | 1 + lib/librte_compat/Makefile | 38 ++++++++++++++++++ lib/librte_compat/rte_compat.h | 90 ++++++++++++++++++++++++++++++++++++++++++ mk/rte.lib.mk | 6 +++ 4 files changed, 135 insertions(+) create mode 100644 lib/librte_compat/Makefile create mode 100644 lib/librte_compat/rte_compat.h diff --git a/lib/Makefile b/lib/Makefile index 10c5bb3..a85b55b 100644 --- a/lib/Makefile +++ b/lib/Makefile @@ -32,6 +32,7 @@ include $(RTE_SDK)/mk/rte.vars.mk DIRS-$(CONFIG_RTE_LIBC) += libc +DIRS-y += librte_compat DIRS-$(CONFIG_RTE_LIBRTE_EAL) += librte_eal DIRS-$(CONFIG_RTE_LIBRTE_MALLOC) += librte_malloc DIRS-$(CONFIG_RTE_LIBRTE_RING) += librte_ring diff --git a/lib/librte_compat/Makefile b/lib/librte_compat/Makefile new file mode 100644 index 0000000..3415c7b --- /dev/null +++ b/lib/librte_compat/Makefile @@ -0,0 +1,38 @@ +# BSD LICENSE +# +# Copyright(c) 2010-2014 Neil Horman +# All rights reserved. +# +# 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 Intel Corporation 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_SDK)/mk/rte.vars.mk + + +# install includes +SYMLINK-y-include := rte_compat.h + +include $(RTE_SDK)/mk/rte.lib.mk diff --git a/lib/librte_compat/rte_compat.h b/lib/librte_compat/rte_compat.h new file mode 100644 index 0000000..0b76771 --- /dev/null +++ b/lib/librte_compat/rte_compat.h @@ -0,0 +1,90 @@ +/*- + * BSD LICENSE + * + * Copyright(c) 2010-2014 Neil Horman . + * All rights reserved. + * + * 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 Intel Corporation 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. + */ + +#ifndef _RTE_COMPAT_H_ +#define _RTE_COMPAT_H_ + +/* + * This is just a stringification macro for use below. + */ +#define SA(x) #x + +#ifdef RTE_BUILD_SHARED_LIB + +/* + * Provides backwards compatibility when updating exported functions. + * When a symol is exported from a library to provide an API, it also provides a + * calling convention (ABI) that is embodied in its name, return type, + * arguments, etc. On occasion that function may need to change to accomodate + * new functionality, behavior, etc. When that occurs, it is desireable to + * allow for backwards compatibility for a time with older binaries that are + * dynamically linked to the dpdk. to support that the __vsym and + * VERSION_SYMBOL macros are created. They, in conjunction with the + * _version.map file for a given library allow for multiple versions of + * a symbol to exist in a shared library so that older binaries need not be + * immediately recompiled. Their use is outlined in the following example: + * Assumptions: DPDK 1.(X) contains a function int foo(char *string) + * DPDK 1.(X+1) needs to change foo to be int foo(int index) + * + * To accomplish this: + * 1) Edit lib//library_version.map to add a DPDK_1.(X+1) node, in which + * foo is exported as a global symbol. + * + * 2) rename the existing function int foo(char *string) to + * int __vsym foo_v18(char *string) + * + * 3) Add this macro immediately below the function + * VERSION_SYMBOL(foo, _v18, 1.8); + * + * 4) Implement a new version of foo. + * + */ +#define VERSION_SYMBOL(b, e, v) __asm__(".symver " SA(b) SA(e) ", "SA(b)"@DPDK_"SA(v)) +#define BASE_SYMBOL(b, n) __asm__(".symver " SA(n) ", "SA(b)"@") +#define BIND_DEFAULT_SYMBOL(b, v) __asm__(".symver " SA(b) ", "SA(b)"@@DPDK_"SA(v)) +#define __vsym __attribute__((used)) + +#else +/* + * No symbol versioning in use + */ +#define VERSION_SYMBOL(b, e, v) +#define __vsym + +/* + * RTE_BUILD_SHARED_LIB + */ +#endif + + +#endif /* _RTE_COMPAT_H_ */ diff --git a/mk/rte.lib.mk b/mk/rte.lib.mk index f458258..82ac309 100644 --- a/mk/rte.lib.mk +++ b/mk/rte.lib.mk @@ -40,8 +40,12 @@ VPATH += $(SRCDIR) ifeq ($(RTE_BUILD_SHARED_LIB),y) LIB := $(patsubst %.a,%.so,$(LIB)) + +CPU_LDFLAGS += --version-script=$(EXPORT_MAP) + endif + _BUILD = $(LIB) _INSTALL = $(INSTALL-FILES-y) $(SYMLINK-FILES-y) $(RTE_OUTPUT)/lib/$(LIB) _CLEAN = doclean @@ -160,7 +164,9 @@ endif $(RTE_OUTPUT)/lib/$(LIB): $(LIB) @echo " INSTALL-LIB $(LIB)" @[ -d $(RTE_OUTPUT)/lib ] || mkdir -p $(RTE_OUTPUT)/lib +ifneq ($(LIB),) $(Q)cp -f $(LIB) $(RTE_OUTPUT)/lib +endif # # Clean all generated files -- 1.9.3