xref: /titanic_41/usr/src/common/mapfiles/gen/Makefile (revision f998c95e3b7029fe5f7542e115f7474ddb8024d7)
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