1# 2# CDDL HEADER START 3# 4# The contents of this file are subject to the terms of the 5# Common Development and Distribution License (the "License"). 6# You may not use this file except in compliance with the License. 7# 8# You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9# or http://www.opensolaris.org/os/licensing. 10# See the License for the specific language governing permissions 11# and limitations under the License. 12# 13# When distributing Covered Code, include this CDDL HEADER in each 14# file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15# If applicable, add the following below this CDDL HEADER, with the 16# fields enclosed by brackets "[]" replaced with your own identifying 17# information: Portions Copyright [yyyy] [name of copyright owner] 18# 19# CDDL HEADER END 20# 21 22# 23# Copyright 2007 Sun Microsystems, Inc. All rights reserved. 24# Use is subject to license terms. 25# Copyright 2015 Igor Kozhukhov <ikozhukhov@gmail.com> 26# 27 28include $(SRC)/Makefile.master 29 30 31FILES= $(MACH)_gcc_map.noexeglobs 32 33NATIVE_LIBS += libc.so 34LDFLAGS += $(BDIRECT) 35 36$(BUILD64)FILES += $(MACH64)_gcc_map.noexeglobs 37 38SYMS1= syms.1 39SYMS2= syms.2 40MAIN1= main.1 41MAIN2= main.2 42 43TEMPLATE1= map.noexeglobs.1.template 44TEMPLATE2= map.noexeglobs.2.template 45 46all install: $(FILES) 47 48clean: 49 $(RM) $(SYMS1) $(SYMS2) $(MAIN1) $(MAIN2) 50 51clobber: clean 52 $(RM) $(FILES) 53 54# A number of dynamic executables have their own definitions of interfaces that 55# exist in system libraries. To prevent name-space pollution it is desirable 56# to demote the interfaces within these executable to locals. However, various 57# symbols defined by the compiler drivers crt/values files need to remain 58# global in any dynamic object that includes these files. These symbols 59# interpose on symbols in libc, or provide call backs for other system 60# libraries. The various compiler drivers (cc and gcc), and the crt/values 61# files that these drivers are configured to include, differ between the 62# various compilations environments (platform, 32/64-bit). Therefore, the 63# only means of creating a mapfile to demote symbols is to dynamically generate 64# the mapfile for a specific compilation environment. 65# 66# Here, template mapfiles are used to generate a number of compilation specific 67# mapfiles. These mapfiles are referenced by components of the build through 68# the MAPFILE.NGB macro defined in Makefile.master. These dynamically created 69# mapfiles are not delivered into the $ROOT area, and therefore are not 70# delivered as packaged components of the OSNet. 71 72$(MACH)_cc_map.noexeglobs := LINK = $(LINK.c) 73$(MACH64)_cc_map.noexeglobs := LINK = $(LINK64.c) 74$(MACH)_gcc_map.noexeglobs := LINK = $(LINK.c) 75$(MACH64)_gcc_map.noexeglobs := LINK = $(LINK64.c) 76 77# This generic target creates two dynamic executables from an empty "main" 78# program. These objects are not executed, but are analyzed to determine the 79# global symbols each provides. 80# 81# The first executable demotes a family of known interfaces to local and allows 82# all other symbol definitions to remain global. This executables provides the 83# base for discovering all symbol definitions provided by the various 84# compilation environments. The second executable demotes all symbols to 85# locals. Within both executables, some symbols remain globals (_end, _etext, 86# etc.) as the link-editor has special knowledge of these symbols and their 87# expected visibility requirements. By inspecting the deferences between the 88# global symbols within the two executables, a mapfile can be generated to 89# ensure the symbols defined by the compilation environments files remain 90# global. 91 92%map.noexeglobs:main.c $(TEMPLATE1) $(TEMPLATE2) 93 $(LINK) -o $(MAIN1) -Wl,-M$(TEMPLATE1) main.c 94 $(ELFDUMP) -s -N.dynsym $(MAIN1) | $(EGREP) "WEAK|GLOB" | \ 95 $(GREP) -v UNDEF | $(AWK) '{print $$9 }' | $(SORT) > $(SYMS1) 96 $(LINK) -o $(MAIN2) -Wl,-M$(TEMPLATE2) main.c 97 $(ELFDUMP) -s -N.dynsym $(MAIN2) | $(EGREP) "WEAK|GLOB" | \ 98 $(GREP) -v UNDEF | $(AWK) '{print $$9 }' | $(SORT) > $(SYMS2) 99 $(ECHO) "# GENERATED FILE - DO NOT EDIT" > $@ 100 $(GREP) MAP-HEAD $(TEMPLATE2) | \ 101 $(SED) -e "s/ *# MAP-HEAD//" >> $@ 102 $(DIFF) $(SYMS1) $(SYMS2) | $(GREP) "^<" | \ 103 $(SED) -e "s/^< \(.*\)/ \1;/" >> $@ 104 $(GREP) MAP-TAIL $(TEMPLATE2) | \ 105 $(SED) -e "s/ *# MAP-TAIL//" >> $@ 106 $(RM) $(SYMS1) $(SYMS2) $(MAIN1) $(MAIN2) 107