1#!/bin/sh
2# genscripts.sh - generate the ld-emulation-target specific files
3# Copyright (C) 2004-2016 Free Software Foundation, Inc.
4#
5# This file is part of the Gnu Linker.
6#
7# This program is free software; you can redistribute it and/or modify
8# it under the terms of the GNU General Public License as published by
9# the Free Software Foundation; either version 3, or (at your option)
10# any later version.
11#
12# This program is distributed in the hope that it will be useful,
13# but WITHOUT ANY WARRANTY; without even the implied warranty of
14# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15# GNU General Public License for more details.
16#
17# You should have received a copy of the GNU General Public License
18# along with GLD; see the file COPYING.  If not, write to the Free
19# Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
20# 02110-1301, USA.
21#
22# Usage: genscripts_extra.sh \
23#          srcdir \
24#          libdir \
25#          prefix \
26#          exec_prefix \
27#          host \
28#          target \
29#          target_alias \
30#          default_emulation \
31#          native_lib_dirs \
32#          use_sysroot \
33#          enable_initfini_array \
34#          this_emulation \
35# optional:
36#          tool_dir
37#
38# Sample usage:
39#
40#   genscripts_extra.sh \
41#    /sources/ld \
42#    /usr/local/lib \
43#    /usr/local \
44#    /usr/local \
45#    sparc-sun-sunos4.1.3 \
46#    sparc-sun-sunos4.1.3 \
47#    sparc-sun-sunos4.1.3 \
48#    sun4 \
49#    "" \
50#    no \
51#    sun3 \
52#    sparc-sun-sunos4.1.3 \
53#    sparc.sh
54#
55# produces the linker scripts:
56#
57#   sun3.x       [default linker script]
58#   sun3.xbn     [used when the linker is invoked with "-N"]
59#   sun3.xn      [used when the linker is invoked with "-n"]
60#   sun3.xr      [used when the linker is invoked with "-r"]
61#   sun3.xu      [used when the linker is invoked with "-Ur"]
62# and maybe:
63#   sun3.xc      [used when the linker is invoked with "-z combreloc"]
64#   sun3.xsc     [used when the linker is invoked with "--shared"]
65#   sun3.xdc     [used when the linker is invoked with "-pie"]
66#   sun3.xa      [used when the linker is invoked with "--enable-auto-import"]
67#
68# It also produced the C source file:
69#
70#   em_sun3.c
71#
72# which is then compiled into the linker.
73#
74# The linker scripts are created by running the shell script
75# /sources/ld/emulparams/sparc.sh to set the value of ${SCRIPT_NAME}
76# (and any other variables it wants to).  ${SCRIPT_NAME} is then
77# invoked with a variable called ${LD_FLAG} to tell it which version
78# of the linker script to create.
79
80
81srcdir=$1
82libdir=$2
83prefix=$3
84exec_prefix=$4
85host=$5
86target=$6
87target_alias=$7
88EMULATION_LIBPATH=$8
89NATIVE_LIB_DIRS=$9
90shift 9
91use_sysroot=$1
92ENABLE_INITFINI_ARRAY=$2
93EMULATION_NAME=$3
94TOOL_LIB=$4
95
96# Include the emulation-specific parameters:
97CUSTOMIZER_SCRIPT="${srcdir}/emulparams/${EMULATION_NAME}.sh"
98. ${CUSTOMIZER_SCRIPT}
99
100if test -d ldscripts; then
101  true
102else
103  mkdir ldscripts
104fi
105
106# Set some flags for the emultempl scripts.  USE_LIBPATH will
107# be set for any libpath-using emulation; NATIVE will be set for a
108# libpath-using emulation where ${host} = ${target}.  NATIVE
109# may already have been set by the emulparams file, but that's OK
110# (it'll just get set to "yes" twice).
111
112case " $EMULATION_LIBPATH " in
113  *" ${EMULATION_NAME} "*)
114    if [ "x${host}" = "x${target}" ] ; then
115      NATIVE=yes
116      USE_LIBPATH=yes
117    elif [ "x${use_sysroot}" = "xyes" ] ; then
118      USE_LIBPATH=yes
119    fi
120    ;;
121esac
122
123# If the emulparams file sets NATIVE, make sure USE_LIBPATH is set also.
124if test "x$NATIVE" = "xyes" ; then
125  USE_LIBPATH=yes
126fi
127
128# Set the library search path, for libraries named by -lfoo.
129# If LIB_PATH is defined (e.g., by Makefile) and non-empty, it is used.
130# Otherwise, the default is set here.
131#
132# The format is the usual list of colon-separated directories.
133# To force a logically empty LIB_PATH, do LIBPATH=":".
134#
135# If we are using a sysroot, prefix library paths with "=" to indicate this.
136#
137# If the emulparams file set LIBPATH_SUFFIX, prepend an extra copy of
138# the library path with the suffix applied.
139
140# Paths with LIBPATH_SUFFIX
141lib_path1=
142# Paths without LIBPATH_SUFFIX
143lib_path2=
144if [ "${LIB_PATH}" != ":" ] ; then
145  lib_path2=${LIB_PATH}
146fi
147
148# Add args to lib_path1 and lib_path2, discarding any duplicates
149append_to_lib_path()
150{
151  if [ $# != 0 ]; then
152    for lib in "$@"; do
153      # The "=" is harmless if we aren't using a sysroot, but also needless.
154      if [ "x${use_sysroot}" = "xyes" ] ; then
155	lib="=${lib}"
156      fi
157      skip_lib=no
158      if test -n "${LIBPATH_SUFFIX}"; then
159	case "${lib}" in
160	  *${LIBPATH_SUFFIX})
161	    case :${lib_path1}: in
162	      *:${lib}:*) ;;
163	      ::) lib_path1=${lib} ;;
164	      *) lib_path1=${lib_path1}:${lib} ;;
165	    esac ;;
166	  *)
167	    if test -n "${LIBPATH_SUFFIX_SKIP}"; then
168	      case "${lib}" in
169		*${LIBPATH_SUFFIX_SKIP}) skip_lib=yes ;;
170	      esac
171	    fi
172	    if test "${skip_lib}" = "no"; then
173	      case :${lib_path1}: in
174		*:${lib}${LIBPATH_SUFFIX}:*) ;;
175		::) lib_path1=${lib}${LIBPATH_SUFFIX} ;;
176	        *) lib_path1=${lib_path1}:${lib}${LIBPATH_SUFFIX} ;;
177	      esac
178	    fi ;;
179	esac
180      fi
181      if test "${skip_lib}" = "no"; then
182	case :${lib_path1}:${lib_path2}: in
183	  *:${lib}:*) ;;
184	  *::) lib_path2=${lib} ;;
185	  *) lib_path2=${lib_path2}:${lib} ;;
186	esac
187      fi
188    done
189  fi
190}
191
192# Always search $(tooldir)/lib, aka /usr/local/TARGET/lib when native
193# except when LIBPATH=":".
194if [ "${LIB_PATH}" != ":" ] ; then
195  libs=
196  if [ "x${TOOL_LIB}" = "x" ] ; then
197    if [ "x${NATIVE}" = "xyes" ] ; then
198      libs="${exec_prefix}/${target_alias}/lib"
199    fi
200  else
201    # For multilib'ed targets, ensure both ${target_alias}/lib${LIBPATH_SUFFIX}
202    # and ${TOOL_LIB}/lib${LIBPATH_SUFFIX} are in the default search path,
203    # because 64bit libraries may be in both places, depending on
204    # cross-development setup method (e.g.: /usr/s390x-linux/lib64
205    # vs. /usr/s390-linux/lib64)
206    case "${NATIVE}:${LIBPATH_SUFFIX}:${TOOL_LIB}" in
207      :* | *::* | *:*:*${LIBPATH_SUFFIX}) ;;
208      *) libs="${exec_prefix}/${target_alias}/lib${LIBPATH_SUFFIX}" ;;
209    esac
210    libs="${exec_prefix}/${TOOL_LIB}/lib ${libs}"
211  fi
212  append_to_lib_path ${libs}
213fi
214
215if [ "x${LIB_PATH}" = "x" ] && [ "x${USE_LIBPATH}" = xyes ] ; then
216  libs=${NATIVE_LIB_DIRS}
217  if [ "x${NATIVE}" = "xyes" ] ; then
218    case " ${libs} " in
219      *" ${libdir} "*) ;;
220      *) libs="${libdir} ${libs}" ;;
221    esac
222  fi
223  append_to_lib_path ${libs}
224fi
225
226case :${lib_path1}:${lib_path2}: in
227  *:: | ::*) LIB_PATH=${lib_path1}${lib_path2} ;;
228  *) LIB_PATH=${lib_path1}:${lib_path2} ;;
229esac
230
231LIB_SEARCH_DIRS=`echo ${LIB_PATH} | sed -e 's/:/ /g' -e 's/\([^ ][^ ]*\)/SEARCH_DIR(\\"\1\\");/g'`
232
233# We need it for testsuite.
234set $EMULATION_LIBPATH
235if [ "x$1" = "x$EMULATION_NAME" ]; then
236    test -d tmpdir || mkdir tmpdir
237    rm -f tmpdir/libpath.exp
238    echo "set libpath \"${LIB_PATH}\"" | sed -e 's/:/ /g' > tmpdir/libpath.exp
239fi
240
241# Generate 5 or 6 script files from a master script template in
242# ${srcdir}/scripttempl/${SCRIPT_NAME}.sh.  Which one of the 5 or 6
243# script files is actually used depends on command line options given
244# to ld.  (SCRIPT_NAME was set in the emulparams_file.)
245#
246# A .x script file is the default script.
247# A .xr script is for linking without relocation (-r flag).
248# A .xu script is like .xr, but *do* create constructors (-Ur flag).
249# A .xn script is for linking with -n flag (mix text and data on same page).
250# A .xbn script is for linking with -N flag (mix text and data on same page).
251# A .xs script is for generating a shared library with the --shared
252#   flag; it is only generated if $GENERATE_SHLIB_SCRIPT is set by the
253#   emulation parameters.
254# A .xc script is for linking with -z combreloc; it is only generated if
255#   $GENERATE_COMBRELOC_SCRIPT is set by the emulation parameters or
256#   $SCRIPT_NAME is "elf".
257# A .xsc script is for linking with --shared -z combreloc; it is generated
258#   if $GENERATE_COMBRELOC_SCRIPT is set by the emulation parameters or
259#   $SCRIPT_NAME is "elf" and $GENERATE_SHLIB_SCRIPT is set by the emulation
260#   parameters too.
261
262if [ "x$SCRIPT_NAME" = "xelf" ]; then
263  GENERATE_COMBRELOC_SCRIPT=yes
264fi
265
266SEGMENT_SIZE=${SEGMENT_SIZE-${MAXPAGESIZE-${TARGET_PAGE_SIZE}}}
267
268# Determine DATA_ALIGNMENT for the 5 variants, using
269# values specified in the emulparams/<script_to_run>.sh file or default.
270
271DATA_ALIGNMENT_="${DATA_ALIGNMENT_-${DATA_ALIGNMENT-ALIGN(${SEGMENT_SIZE})}}"
272DATA_ALIGNMENT_n="${DATA_ALIGNMENT_n-${DATA_ALIGNMENT_}}"
273DATA_ALIGNMENT_N="${DATA_ALIGNMENT_N-${DATA_ALIGNMENT-.}}"
274DATA_ALIGNMENT_r="${DATA_ALIGNMENT_r-${DATA_ALIGNMENT-}}"
275DATA_ALIGNMENT_u="${DATA_ALIGNMENT_u-${DATA_ALIGNMENT_r}}"
276
277LD_FLAG=r
278DATA_ALIGNMENT=${DATA_ALIGNMENT_r}
279DEFAULT_DATA_ALIGNMENT="ALIGN(${SEGMENT_SIZE})"
280( echo "/* Script for ld -r: link without relocation */"
281  . ${CUSTOMIZER_SCRIPT}
282  . ${srcdir}/scripttempl/${SCRIPT_NAME}.sc
283) | sed -e '/^ *$/d;s/[ 	]*$//' > ldscripts/${EMULATION_NAME}.xr
284
285LD_FLAG=u
286DATA_ALIGNMENT=${DATA_ALIGNMENT_u}
287CONSTRUCTING=" "
288( echo "/* Script for ld -Ur: link w/out relocation, do create constructors */"
289  . ${CUSTOMIZER_SCRIPT}
290  . ${srcdir}/scripttempl/${SCRIPT_NAME}.sc
291) | sed -e '/^ *$/d;s/[ 	]*$//' > ldscripts/${EMULATION_NAME}.xu
292
293LD_FLAG=
294DATA_ALIGNMENT=${DATA_ALIGNMENT_}
295RELOCATING=" "
296( echo "/* Default linker script, for normal executables */"
297  . ${CUSTOMIZER_SCRIPT}
298  . ${srcdir}/scripttempl/${SCRIPT_NAME}.sc
299) | sed -e '/^ *$/d;s/[ 	]*$//' > ldscripts/${EMULATION_NAME}.x
300
301LD_FLAG=n
302DATA_ALIGNMENT=${DATA_ALIGNMENT_n}
303( echo "/* Script for -n: mix text and data on same page */"
304  . ${CUSTOMIZER_SCRIPT}
305  . ${srcdir}/scripttempl/${SCRIPT_NAME}.sc
306) | sed -e '/^ *$/d;s/[ 	]*$//' > ldscripts/${EMULATION_NAME}.xn
307
308LD_FLAG=N
309DATA_ALIGNMENT=${DATA_ALIGNMENT_N}
310( echo "/* Script for -N: mix text and data on same page; don't align data */"
311  . ${CUSTOMIZER_SCRIPT}
312  . ${srcdir}/scripttempl/${SCRIPT_NAME}.sc
313) | sed -e '/^ *$/d;s/[ 	]*$//' > ldscripts/${EMULATION_NAME}.xbn
314
315if test -n "$GENERATE_COMBRELOC_SCRIPT"; then
316  DATA_ALIGNMENT=${DATA_ALIGNMENT_c-${DATA_ALIGNMENT_}}
317  LD_FLAG=c
318  COMBRELOC=ldscripts/${EMULATION_NAME}.xc.tmp
319  ( echo "/* Script for -z combreloc: combine and sort reloc sections */"
320    . ${CUSTOMIZER_SCRIPT}
321    . ${srcdir}/scripttempl/${SCRIPT_NAME}.sc
322  ) | sed -e '/^ *$/d;s/[ 	]*$//' > ldscripts/${EMULATION_NAME}.xc
323  rm -f ${COMBRELOC}
324  LD_FLAG=w
325  RELRO_NOW=" "
326  COMBRELOC=ldscripts/${EMULATION_NAME}.xw.tmp
327  ( echo "/* Script for -z combreloc -z now -z relro: combine and sort reloc sections */"
328    . ${CUSTOMIZER_SCRIPT}
329    . ${srcdir}/scripttempl/${SCRIPT_NAME}.sc
330  ) | sed -e '/^ *$/d;s/[ 	]*$//' > ldscripts/${EMULATION_NAME}.xw
331  rm -f ${COMBRELOC}
332  COMBRELOC=
333  unset RELRO_NOW
334fi
335
336if test -n "$GENERATE_SHLIB_SCRIPT"; then
337  LD_FLAG=shared
338  DATA_ALIGNMENT=${DATA_ALIGNMENT_s-${DATA_ALIGNMENT_}}
339  CREATE_SHLIB=" "
340  (
341    echo "/* Script for ld --shared: link shared library */"
342    . ${CUSTOMIZER_SCRIPT}
343    . ${srcdir}/scripttempl/${SCRIPT_NAME}.sc
344  ) | sed -e '/^ *$/d;s/[ 	]*$//' > ldscripts/${EMULATION_NAME}.xs
345  if test -n "$GENERATE_COMBRELOC_SCRIPT"; then
346    LD_FLAG=cshared
347    DATA_ALIGNMENT=${DATA_ALIGNMENT_sc-${DATA_ALIGNMENT}}
348    COMBRELOC=ldscripts/${EMULATION_NAME}.xsc.tmp
349    ( echo "/* Script for --shared -z combreloc: shared library, combine & sort relocs */"
350      . ${CUSTOMIZER_SCRIPT}
351      . ${srcdir}/scripttempl/${SCRIPT_NAME}.sc
352    ) | sed -e '/^ *$/d;s/[ 	]*$//' > ldscripts/${EMULATION_NAME}.xsc
353    rm -f ${COMBRELOC}
354    LD_FLAG=wshared
355    RELRO_NOW=" "
356    COMBRELOC=ldscripts/${EMULATION_NAME}.xsw.tmp
357    ( echo "/* Script for --shared -z combreloc -z now -z relro: shared library, combine & sort relocs */"
358      . ${CUSTOMIZER_SCRIPT}
359      . ${srcdir}/scripttempl/${SCRIPT_NAME}.sc
360    ) | sed -e '/^ *$/d;s/[ 	]*$//' > ldscripts/${EMULATION_NAME}.xsw
361    rm -f ${COMBRELOC}
362    COMBRELOC=
363    unset RELRO_NOW
364  fi
365  unset CREATE_SHLIB
366fi
367
368if test -n "$GENERATE_PIE_SCRIPT"; then
369  LD_FLAG=pie
370  DATA_ALIGNMENT=${DATA_ALIGNMENT_s-${DATA_ALIGNMENT_}}
371  CREATE_PIE=" "
372  (
373    echo "/* Script for ld -pie: link position independent executable */"
374    . ${CUSTOMIZER_SCRIPT}
375    . ${srcdir}/scripttempl/${SCRIPT_NAME}.sc
376  ) | sed -e '/^ *$/d;s/[ 	]*$//' > ldscripts/${EMULATION_NAME}.xd
377  if test -n "$GENERATE_COMBRELOC_SCRIPT"; then
378    LD_FLAG=cpie
379    DATA_ALIGNMENT=${DATA_ALIGNMENT_sc-${DATA_ALIGNMENT}}
380    COMBRELOC=ldscripts/${EMULATION_NAME}.xdc.tmp
381    ( echo "/* Script for -pie -z combreloc: position independent executable, combine & sort relocs */"
382      . ${CUSTOMIZER_SCRIPT}
383      . ${srcdir}/scripttempl/${SCRIPT_NAME}.sc
384    ) | sed -e '/^ *$/d;s/[ 	]*$//' > ldscripts/${EMULATION_NAME}.xdc
385    rm -f ${COMBRELOC}
386    LD_FLAG=wpie
387    RELRO_NOW=" "
388    COMBRELOC=ldscripts/${EMULATION_NAME}.xdw.tmp
389    ( echo "/* Script for -pie -z combreloc -z now -z relro: position independent executable, combine & sort relocs */"
390      . ${CUSTOMIZER_SCRIPT}
391      . ${srcdir}/scripttempl/${SCRIPT_NAME}.sc
392    ) | sed -e '/^ *$/d;s/[ 	]*$//' > ldscripts/${EMULATION_NAME}.xdw
393    rm -f ${COMBRELOC}
394    COMBRELOC=
395    unset RELRO_NOW
396  fi
397  unset CREATE_PIE
398fi
399
400if test -n "$GENERATE_AUTO_IMPORT_SCRIPT"; then
401  LD_FLAG=auto_import
402  DATA_ALIGNMENT=${DATA_ALIGNMENT_}
403  (
404    echo "/* Script for ld --enable-auto-import: Like the default script except read only data is placed into .data  */"
405    . ${CUSTOMIZER_SCRIPT}
406    . ${srcdir}/scripttempl/${SCRIPT_NAME}.sc
407  ) | sed -e '/^ *$/d;s/[ 	]*$//' > ldscripts/${EMULATION_NAME}.xa
408fi
409
410case "$COMPILE_IN: $EMULATION_LIBPATH " in
411    :*" ${EMULATION_NAME} "*) COMPILE_IN=yes;;
412esac
413
414# PR ld/5652:
415# Determine if the shell has support for the variable BASH_LINENO.
416# When it is the case, it is only available inside functions.
417has_lineno()
418{
419  test "x$BASH_LINENO" != "x"
420}
421
422# Enable accruate error source in the compiler error messages, if possible.
423if has_lineno; then
424  . ${srcdir}/genscrba.sh
425else
426  source_em()
427  {
428    . $1
429  }
430  fragment()
431  {
432    cat >> e${EMULATION_NAME}.c
433  }
434fi
435
436# Generate e${EMULATION_NAME}.c.
437# Start with an empty file, then the sourced .em script
438# can use the "fragment" function to append.
439> e${EMULATION_NAME}.c
440source_em ${srcdir}/emultempl/${TEMPLATE_NAME-generic}.em
441