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 $(SRC)/Makefile.master 29 30 31$(__GNUC)FILES= $(MACH)_gcc_map.noexeglobs 32$(__SUNC)FILES= $(MACH)_cc_map.noexeglobs 33 34NATIVE_LIBS += libc.so 35LDFLAGS += $(BDIRECT) 36 37$(__GNUC)$(BUILD64)FILES += $(MACH64)_gcc_map.noexeglobs 38$(__SUNC)$(BUILD64)FILES += $(MACH64)_cc_map.noexeglobs 39 40SYMS1= syms.1 41SYMS2= syms.2 42MAIN1= main.1 43MAIN2= main.2 44 45TEMPLATE1= map.noexeglobs.1.template 46TEMPLATE2= map.noexeglobs.2.template 47 48all install: $(FILES) 49 50clean: 51 $(RM) $(SYMS1) $(SYMS2) $(MAIN1) $(MAIN2) 52 53clobber: clean 54 $(RM) $(FILES) 55 56# A number of dynamic executables have their own definitions of interfaces that 57# exist in system libraries. To prevent name-space pollution it is desirable 58# to demote the interfaces within these executable to locals. However, various 59# symbols defined by the compiler drivers crt/values files need to remain 60# global in any dynamic object that includes these files. These symbols 61# interpose on symbols in libc, or provide call backs for other system 62# libraries. The various compiler drivers (cc and gcc), and the crt/values 63# files that these drivers are configured to include, differ between the 64# various compilations environments (platform, 32/64-bit). Therefore, the 65# only means of creating a mapfile to demote symbols is to dynamically generate 66# the mapfile for a specific compilation environment. 67# 68# Here, template mapfiles are used to generate a number of compilation specific 69# mapfiles. These mapfiles are referenced by components of the build through 70# the MAPFILE.NGB macro defined in Makefile.master. These dynamically created 71# mapfiles are not delivered into the $ROOT area, and therefore are not 72# delivered as packaged components of the OSNet. 73 74$(MACH)_cc_map.noexeglobs := LINK = $(LINK.c) 75$(MACH64)_cc_map.noexeglobs := LINK = $(LINK64.c) 76$(MACH)_gcc_map.noexeglobs := LINK = $(LINK.c) 77$(MACH64)_gcc_map.noexeglobs := LINK = $(LINK64.c) 78 79# This generic target creates two dynamic executables from an empty "main" 80# program. These objects are not executed, but are analyzed to determine the 81# global symbols each provides. 82# 83# The first executable demotes a family of known interfaces to local and allows 84# all other symbol definitions to remain global. This executables provides the 85# base for discovering all symbol definitions provided by the various 86# compilation environments. The second executable demotes all symbols to 87# locals. Within both executables, some symbols remain globals (_end, _etext, 88# etc.) as the link-editor has special knowledge of these symbols and their 89# expected visibility requirements. By inspecting the deferences between the 90# global symbols within the two executables, a mapfile can be generated to 91# ensure the symbols defined by the compilation environments files remain 92# global. 93 94%map.noexeglobs:main.c $(TEMPLATE1) $(TEMPLATE2) 95 $(LINK) -o $(MAIN1) -Wl,-M$(TEMPLATE1) main.c 96 $(ELFDUMP) -s -N.dynsym $(MAIN1) | $(EGREP) "WEAK|GLOB" | \ 97 $(GREP) -v UNDEF | $(AWK) '{print $$9 }' | $(SORT) > $(SYMS1) 98 $(LINK) -o $(MAIN2) -Wl,-M$(TEMPLATE2) main.c 99 $(ELFDUMP) -s -N.dynsym $(MAIN2) | $(EGREP) "WEAK|GLOB" | \ 100 $(GREP) -v UNDEF | $(AWK) '{print $$9 }' | $(SORT) > $(SYMS2) 101 $(ECHO) "# GENERATED FILE - DO NOT EDIT" > $@ 102 $(GREP) MAP-HEAD $(TEMPLATE2) | \ 103 $(SED) -e "s/ *# MAP-HEAD//" >> $@ 104 $(DIFF) $(SYMS1) $(SYMS2) | $(GREP) "^<" | \ 105 $(SED) -e "s/^< \(.*\)/ \1;/" >> $@ 106 $(GREP) MAP-TAIL $(TEMPLATE2) | \ 107 $(SED) -e "s/ *# MAP-TAIL//" >> $@ 108 $(RM) $(SYMS1) $(SYMS2) $(MAIN1) $(MAIN2) 109