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# 26# ident "%Z%%M% %I% %E% SMI" 27# 28 29include $(SRC)/Makefile.master 30 31FILES= \ 32 $(MACH)_cc_map.noexeglobs \ 33 $(MACH)_gcc_map.noexeglobs 34 35$(BUILD64)FILES += \ 36 $(MACH64)_cc_map.noexeglobs \ 37 $(MACH64)_gcc_map.noexeglobs 38 39SYMS1= syms.1 40SYMS2= syms.2 41MAIN1= main.1 42MAIN2= main.2 43 44TEMPLATE1= map.noexeglobs.1.template 45TEMPLATE2= map.noexeglobs.2.template 46 47all install: $(FILES) 48 49lint: 50 51clean: 52 $(RM) $(SYMS1) $(SYMS2) $(MAIN1) $(MAIN2) 53 54clobber: clean 55 $(RM) $(FILES) 56 57# A number of dynamic executables have their own definitions of interfaces that 58# exist in system libraries. To prevent name-space pollution it is desirable 59# to demote the interfaces within these executable to locals. However, various 60# symbols defined by the compiler drivers crt/values files need to remain 61# global in any dynamic object that includes these files. These symbols 62# interpose on symbols in libc, or provide call backs for other system 63# libraries. The various compiler drivers (cc and gcc), and the crt/values 64# files that these drivers are configured to include, differ between the 65# various compilations environments (platform, 32/64-bit). Therefore, the 66# only means of creating a mapfile to demote symbols is to dynamically generate 67# the mapfile for a specific compilation environment. 68# 69# Here, template mapfiles are used to generate a number of compilation specific 70# mapfiles. These mapfiles are referenced by components of the build through 71# the MAPFILE.NGB macro defined in Makefile.master. These dynamically created 72# mapfiles are not delivered into the $ROOT area, and therefore are not 73# delivered as packaged components of the OSNet. 74 75$(MACH)_cc_map.noexeglobs := LINK = $(LINK.c) 76$(MACH64)_cc_map.noexeglobs := LINK = $(LINK64.c) 77 78$(MACH)_gcc_map.noexeglobs := CC = $(ONBLD_TOOLS)/bin/$(MACH)/cw -_gcc 79$(MACH)_gcc_map.noexeglobs := LINK = $(LINK.c) 80$(MACH64)_gcc_map.noexeglobs := CC = $(ONBLD_TOOLS)/bin/$(MACH)/cw -_gcc 81$(MACH64)_gcc_map.noexeglobs := LINK = $(LINK64.c) 82 83# This generic target creates two dynamic executables from an empty "main" 84# program. These objects are not executed, but are analyzed to determine the 85# global symbols each provides. 86# 87# The first executable demotes a family of known interfaces to local and allows 88# all other symbol definitions to remain global. This executables provides the 89# base for discovering all symbol definitions provided by the various 90# compilation environments. The second executable demotes all symbols to 91# locals. Within both executables, some symbols remain globals (_end, _etext, 92# etc.) as the link-editor has special knowledge of these symbols and their 93# expected visibility requirements. By inspecting the deferences between the 94# global symbols within the two executables, a mapfile can be generated to 95# ensure the symbols defined by the compilation environments files remain 96# global. 97 98%map.noexeglobs:main.c $(TEMPLATE1) $(TEMPLATE2) 99 $(LINK) -o $(MAIN1) -M$(TEMPLATE1) main.c 100 $(ELFDUMP) -s -N.dynsym $(MAIN1) | $(EGREP) "WEAK|GLOB" | \ 101 $(GREP) -v UNDEF | $(NAWK) '{print $$9 }' | $(SORT) > $(SYMS1) 102 $(LINK) -o $(MAIN2) -M$(TEMPLATE2) main.c 103 $(ELFDUMP) -s -N.dynsym $(MAIN2) | $(EGREP) "WEAK|GLOB" | \ 104 $(GREP) -v UNDEF | $(NAWK) '{print $$9 }' | $(SORT) > $(SYMS2) 105 $(ECHO) "# GENERATED FILE - DO NOT EDIT" > $@ 106 $(GREP) MAP-HEAD $(TEMPLATE2) | \ 107 $(SED) -e "s/ *# MAP-HEAD//" >> $@ 108 $(DIFF) $(SYMS1) $(SYMS2) | $(GREP) "^<" | \ 109 $(SED) -e "s/^< \(.*\)/ \1;/" >> $@ 110 $(GREP) MAP-TAIL $(TEMPLATE2) | \ 111 $(SED) -e "s/ *# MAP-TAIL//" >> $@ 112 $(RM) $(SYMS1) $(SYMS2) $(MAIN1) $(MAIN2) 113