1#
2# Copyright (c) 2004, 2010, Oracle and/or its affiliates. All rights reserved.
3#
4# CDDL HEADER START
5#
6# The contents of this file are subject to the terms of the
7# Common Development and Distribution License (the "License").
8# You may not use this file except in compliance with the License.
9#
10# You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
11# or http://www.opensolaris.org/os/licensing.
12# See the License for the specific language governing permissions
13# and limitations under the License.
14#
15# When distributing Covered Code, include this CDDL HEADER in each
16# file and include the License file at usr/src/OPENSOLARIS.LICENSE.
17# If applicable, add the following below this CDDL HEADER, with the
18# fields enclosed by brackets "[]" replaced with your own identifying
19# information: Portions Copyright [yyyy] [name of copyright owner]
20#
21# CDDL HEADER END
22#
23# Link-editor mapfile to create a non-executable data segment definition
24# within an executable.  Note that this only functions properly on the
25# x86 architecture.  On SPARC, the data segment contains a Procedure Linkage
26# Table (PLT) that must remain executable.
27#
28# As the data segment is extended by sbrk(2) to enlarge the heap, a
29# non-executable data segment also results in a non-exutable heap.
30#
31# The link-editor does not use this file automatically, so one must use the
32# -M option to cc or ld:
33#
34#       cc -M /usr/lib/ld/map.noexdata myprogram.c
35#
36
37#
38# Executables can also create a separate non-executable bss segment.
39# This segment may use additional memory, but also results in a
40# non-executable heap.  See /usr/lib/ld/map.noexbss.
41#
42# See also /usr/lib/ld/map.execdata.
43
44$mapfile_version 2
45
46$if _sparc
47
48$error SPARC Procedure Linkage Table (PLT) must remain executable
49
50$elif _x86
51
52LOAD_SEGMENT data { FLAGS = READ WRITE };
53
54$else
55$error unknown platform
56$endif
57