xref: /illumos-gate/usr/src/common/mapfiles/common/map.noexdata (revision cd3e9333)

#
# Copyright (c) 2004, 2010, Oracle and/or its affiliates. All rights reserved.
#
# CDDL HEADER START
#
# The contents of this file are subject to the terms of the
# Common Development and Distribution License (the "License").
# You may not use this file except in compliance with the License.
#
# You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
# or http://www.opensolaris.org/os/licensing.
# See the License for the specific language governing permissions
# and limitations under the License.
#
# When distributing Covered Code, include this CDDL HEADER in each
# file and include the License file at usr/src/OPENSOLARIS.LICENSE.
# If applicable, add the following below this CDDL HEADER, with the
# fields enclosed by brackets "[]" replaced with your own identifying
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#
# Link-editor mapfile to create a non-executable data segment definition
# within an executable.  Note that this only functions properly on the
# x86 architecture.  On SPARC, the data segment contains a Procedure Linkage
# Table (PLT) that must remain executable.
#
# As the data segment is extended by sbrk(2) to enlarge the heap, a
# non-executable data segment also results in a non-exutable heap.
#
# The link-editor does not use this file automatically, so one must use the
# -M option to cc or ld:
#
#       cc -M /usr/lib/ld/map.noexdata myprogram.c
#

#
# Executables can also create a separate non-executable bss segment.
# This segment may use additional memory, but also results in a
# non-executable heap.  See /usr/lib/ld/map.noexbss.
#
# See also /usr/lib/ld/map.execdata.

$mapfile_version 2

$if _sparc

$error SPARC Procedure Linkage Table (PLT) must remain executable

$elif _x86

LOAD_SEGMENT data { FLAGS = READ WRITE };

$else
$error unknown platform
$endif