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