genscripts.sh revision 130561 
1#!/bin/sh
2# genscripts.sh - generate the ld-emulation-target specific files
3#
4# Usage: genscripts_extra.sh \
5#          srcdir \
6#          libdir \
7#          exec_prefix \
8#          host \
9#          target \
10#          target_alias \
11#          default_emulation \
12#          native_lib_dirs \
13#          use_sysroot \
14#          this_emulation \
15# optional:
16#          tool_dir \
17#          customizer_script
18#
19# Sample usage:
20#
21#   genscripts_extra.sh \
22#    /sources/ld \
23#    /usr/local/lib \
24#    /usr/local \
25#    sparc-sun-sunos4.1.3 \
26#    sparc-sun-sunos4.1.3 \
27#    sparc-sun-sunos4.1.3 \
28#    sun4 \
29#    "" \
30#    no \
31#    sun3 \
32#    sparc-sun-sunos4.1.3 \
33#    sparc.sh
34#
35# produces the linker scripts:
36#
37#   sun3.x       [default linker script]
38#   sun3.xbn     [used when the linker is invoked with "-N"]
39#   sun3.xn      [used when the linker is invoked with "-n"]
40#   sun3.xr      [used when the linker is invoked with "-r"]
41#   sun3.xu      [used when the linker is invoked with "-Ur"]
42# and maybe:
43#   sun3.xc      [used when the linker is invoked with "-z combreloc"]
44#   sun3.xsc     [used when the linker is invoked with "--shared"]
45#   sun3.xdc     [used when the linker is invoked with "-pie"]
46#
47# It also produced the C source file:
48#
49#   em_sun3.c
50#
51# which is then compiled into the linker.
52#
53# The linker scripts are created by running the shell script
54# /sources/ld/emulparams/sparc.sh to set the value of ${SCRIPT_NAME}
55# (and any other variables it wants to).  ${SCRIPT_NAME} is then
56# invoked with a variable called ${LD_FLAG} to tell it which version
57# of the linker script to create.
58
59
60srcdir=$1
61libdir=$2
62exec_prefix=$3
63host=$4
64target=$5
65target_alias=$6
66EMULATION_LIBPATH=$7
67NATIVE_LIB_DIRS=$8
68use_sysroot=$9
69shift 9
70EMULATION_NAME=$1
71TOOL_LIB=$2
72CUSTOMIZER_SCRIPT=$3
73
74# Can't use ${TOOL_LIB:-$target_alias} here due to an Ultrix shell bug.
75if [ "x${TOOL_LIB}" = "x" ] ; then
76  tool_lib=${exec_prefix}/${target_alias}/lib
77else
78  tool_lib=${exec_prefix}/${TOOL_LIB}/lib
79fi
80
81if [ "x${CUSTOMIZER_SCRIPT}" = "x" ] ; then
82  CUSTOMIZER_SCRIPT=${EMULATION_NAME}
83fi
84CUSTOMIZER_SCRIPT="${srcdir}/emulparams/${CUSTOMIZER_SCRIPT}.sh"
85
86# Include the emulation-specific parameters:
87. ${CUSTOMIZER_SCRIPT} ${EMULATION_NAME}
88
89if test -d ldscripts; then
90  true
91else
92  mkdir ldscripts
93fi
94
95# Set some flags for the emultempl scripts.  USE_LIBPATH will
96# be set for any libpath-using emulation; NATIVE will be set for a
97# libpath-using emulation where ${host} = ${target}.  NATIVE
98# may already have been set by the emulparams file, but that's OK
99# (it'll just get set to "yes" twice).
100
101case " $EMULATION_LIBPATH " in
102  *" ${EMULATION_NAME} "*)
103    if [ "x${host}" = "x${target}" ] ; then
104      NATIVE=yes
105      USE_LIBPATH=yes
106    elif [ "x${use_sysroot}" = "xyes" ] ; then
107      USE_LIBPATH=yes
108    fi
109    ;;
110esac
111
112# If the emulparams file sets NATIVE, make sure USE_LIBPATH is set also.
113if test "x$NATIVE" = "xyes" ; then
114  USE_LIBPATH=yes
115fi
116
117# Set the library search path, for libraries named by -lfoo.
118# If LIB_PATH is defined (e.g., by Makefile) and non-empty, it is used.
119# Otherwise, the default is set here.
120#
121# The format is the usual list of colon-separated directories.
122# To force a logically empty LIB_PATH, do LIBPATH=":".
123#
124# If we are using a sysroot, prefix library paths with "=" to indicate this.
125#
126# If the emulparams file set LIBPATH_SUFFIX, prepend an extra copy of
127# the library path with the suffix applied.
128
129if [ "x${LIB_PATH}" = "x" ] && [ "x${USE_LIBPATH}" = xyes ] ; then
130  LIB_PATH2=
131
132  libs=${NATIVE_LIB_DIRS}
133  if [ "x${use_sysroot}" != "xyes" ] ; then
134    case " ${libs} " in
135      *" ${libdir} "*) ;;
136      *) libs="${libdir} ${libs}" ;;
137    esac
138    case " ${libs} " in
139      *" ${tool_lib} "*) ;;
140      *) libs="${tool_lib} ${libs}" ;;
141    esac
142  fi
143
144  for lib in ${libs}; do
145    # The "=" is harmless if we aren't using a sysroot, but also needless.
146    if [ "x${use_sysroot}" = "xyes" ] ; then
147      lib="=${lib}"
148    fi
149    addsuffix=
150    case "${LIBPATH_SUFFIX}:${lib}" in
151      :*) ;;
152      *:*${LIBPATH_SUFFIX}) ;;
153      *) addsuffix=yes ;;
154    esac
155    if test -n "$addsuffix"; then
156      case :${LIB_PATH}: in
157	*:${lib}${LIBPATH_SUFFIX}:*) ;;
158	::) LIB_PATH=${lib}${LIBPATH_SUFFIX} ;;
159	*) LIB_PATH=${LIB_PATH}:${lib}${LIBPATH_SUFFIX} ;;
160      esac
161      case :${LIB_PATH}:${LIB_PATH2}: in
162	*:${lib}:*) ;;
163	*::) LIB_PATH2=${lib} ;;
164	*) LIB_PATH2=${LIB_PATH2}:${lib} ;;
165      esac
166    else
167      case :${LIB_PATH2}: in
168	*:${lib}:*) ;;
169	::) LIB_PATH2=${lib} ;;
170	*) LIB_PATH2=${LIB_PATH2}:${lib} ;;
171      esac
172    fi
173  done
174
175  case :${LIB_PATH}:${LIB_PATH2}: in
176    *:: | ::*) LIB_PATH=${LIB_PATH}${LIB_PATH2} ;;
177    *) LIB_PATH=${LIB_PATH}:${LIB_PATH2} ;;
178  esac
179fi
180
181# Always search $(tooldir)/lib, aka /usr/local/TARGET/lib, except for
182# sysrooted configurations and when LIBPATH=":".
183if [ "x${use_sysroot}" != "xyes" ] ; then
184  case :${LIB_PATH}: in
185  ::: | *:${tool_lib}:*) ;;
186  ::) LIB_PATH=${tool_lib} ;;
187  *) LIB_PATH=${tool_lib}:${LIB_PATH} ;;
188  esac
189fi
190
191LIB_SEARCH_DIRS=`echo ${LIB_PATH} | sed -e 's/:/ /g' -e 's/\([^ ][^ ]*\)/SEARCH_DIR(\\"\1\\");/g'`
192
193# We need it for testsuite.
194case " $EMULATION_LIBPATH " in
195  *" ${EMULATION_NAME} "*)
196    test -d tmpdir || mkdir tmpdir
197    test -f tmpdir/libpath.exp || \
198    echo "set libpath \"${LIB_PATH}\"" | sed -e 's/:/ /g' > tmpdir/libpath.exp
199    ;;
200esac
201
202# Generate 5 or 6 script files from a master script template in
203# ${srcdir}/scripttempl/${SCRIPT_NAME}.sh.  Which one of the 5 or 6
204# script files is actually used depends on command line options given
205# to ld.  (SCRIPT_NAME was set in the emulparams_file.)
206#
207# A .x script file is the default script.
208# A .xr script is for linking without relocation (-r flag).
209# A .xu script is like .xr, but *do* create constructors (-Ur flag).
210# A .xn script is for linking with -n flag (mix text and data on same page).
211# A .xbn script is for linking with -N flag (mix text and data on same page).
212# A .xs script is for generating a shared library with the --shared
213#   flag; it is only generated if $GENERATE_SHLIB_SCRIPT is set by the
214#   emulation parameters.
215# A .xc script is for linking with -z combreloc; it is only generated if
216#   $GENERATE_COMBRELOC_SCRIPT is set by the emulation parameters or
217#   $SCRIPT_NAME is "elf".
218# A .xsc script is for linking with --shared -z combreloc; it is generated
219#   if $GENERATE_COMBRELOC_SCRIPT is set by the emulation parameters or
220#   $SCRIPT_NAME is "elf" and $GENERATE_SHLIB_SCRIPT is set by the emulation
221#   parameters too.
222
223if [ "x$SCRIPT_NAME" = "xelf" ]; then
224  GENERATE_COMBRELOC_SCRIPT=yes
225fi
226
227SEGMENT_SIZE=${SEGMENT_SIZE-${MAXPAGESIZE-${TARGET_PAGE_SIZE}}}
228
229# Determine DATA_ALIGNMENT for the 5 variants, using
230# values specified in the emulparams/<script_to_run>.sh file or default.
231
232DATA_ALIGNMENT_="${DATA_ALIGNMENT_-${DATA_ALIGNMENT-ALIGN(${SEGMENT_SIZE})}}"
233DATA_ALIGNMENT_n="${DATA_ALIGNMENT_n-${DATA_ALIGNMENT_}}"
234DATA_ALIGNMENT_N="${DATA_ALIGNMENT_N-${DATA_ALIGNMENT-.}}"
235DATA_ALIGNMENT_r="${DATA_ALIGNMENT_r-${DATA_ALIGNMENT-}}"
236DATA_ALIGNMENT_u="${DATA_ALIGNMENT_u-${DATA_ALIGNMENT_r}}"
237
238LD_FLAG=r
239DATA_ALIGNMENT=${DATA_ALIGNMENT_r}
240DEFAULT_DATA_ALIGNMENT="ALIGN(${SEGMENT_SIZE})"
241( echo "/* Script for ld -r: link without relocation */"
242  . ${CUSTOMIZER_SCRIPT} ${EMULATION_NAME}
243  . ${srcdir}/scripttempl/${SCRIPT_NAME}.sc
244) | sed -e '/^ *$/d;s/[ 	]*$//' > ldscripts/${EMULATION_NAME}.xr
245
246LD_FLAG=u
247DATA_ALIGNMENT=${DATA_ALIGNMENT_u}
248CONSTRUCTING=" "
249( echo "/* Script for ld -Ur: link w/out relocation, do create constructors */"
250  . ${CUSTOMIZER_SCRIPT} ${EMULATION_NAME}
251  . ${srcdir}/scripttempl/${SCRIPT_NAME}.sc
252) | sed -e '/^ *$/d;s/[ 	]*$//' > ldscripts/${EMULATION_NAME}.xu
253
254LD_FLAG=
255DATA_ALIGNMENT=${DATA_ALIGNMENT_}
256RELOCATING=" "
257( echo "/* Default linker script, for normal executables */"
258  . ${CUSTOMIZER_SCRIPT} ${EMULATION_NAME}
259  . ${srcdir}/scripttempl/${SCRIPT_NAME}.sc
260) | sed -e '/^ *$/d;s/[ 	]*$//' > ldscripts/${EMULATION_NAME}.x
261
262LD_FLAG=n
263DATA_ALIGNMENT=${DATA_ALIGNMENT_n}
264TEXT_START_ADDR=${NONPAGED_TEXT_START_ADDR-${TEXT_START_ADDR}}
265( echo "/* Script for -n: mix text and data on same page */"
266  . ${CUSTOMIZER_SCRIPT} ${EMULATION_NAME}
267  . ${srcdir}/scripttempl/${SCRIPT_NAME}.sc
268) | sed -e '/^ *$/d;s/[ 	]*$//' > ldscripts/${EMULATION_NAME}.xn
269
270LD_FLAG=N
271DATA_ALIGNMENT=${DATA_ALIGNMENT_N}
272( echo "/* Script for -N: mix text and data on same page; don't align data */"
273  . ${CUSTOMIZER_SCRIPT} ${EMULATION_NAME}
274  . ${srcdir}/scripttempl/${SCRIPT_NAME}.sc
275) | sed -e '/^ *$/d;s/[ 	]*$//' > ldscripts/${EMULATION_NAME}.xbn
276
277if test -n "$GENERATE_COMBRELOC_SCRIPT"; then
278  DATA_ALIGNMENT=${DATA_ALIGNMENT_c-${DATA_ALIGNMENT_}}
279  LD_FLAG=c
280  COMBRELOC=ldscripts/${EMULATION_NAME}.xc.tmp
281  ( echo "/* Script for -z combreloc: combine and sort reloc sections */"
282    . ${CUSTOMIZER_SCRIPT} ${EMULATION_NAME}
283    . ${srcdir}/scripttempl/${SCRIPT_NAME}.sc
284  ) | sed -e '/^ *$/d;s/[ 	]*$//' > ldscripts/${EMULATION_NAME}.xc
285  rm -f ${COMBRELOC}
286  COMBRELOC=
287fi
288
289if test -n "$GENERATE_SHLIB_SCRIPT"; then
290  LD_FLAG=shared
291  DATA_ALIGNMENT=${DATA_ALIGNMENT_s-${DATA_ALIGNMENT_}}
292  CREATE_SHLIB=" "
293  # Note that TEXT_START_ADDR is set to NONPAGED_TEXT_START_ADDR.
294  (
295    echo "/* Script for ld --shared: link shared library */"
296    . ${CUSTOMIZER_SCRIPT} ${EMULATION_NAME}
297    . ${srcdir}/scripttempl/${SCRIPT_NAME}.sc
298  ) | sed -e '/^ *$/d;s/[ 	]*$//' > ldscripts/${EMULATION_NAME}.xs
299  if test -n "$GENERATE_COMBRELOC_SCRIPT"; then
300    LD_FLAG=cshared
301    DATA_ALIGNMENT=${DATA_ALIGNMENT_sc-${DATA_ALIGNMENT}}
302    COMBRELOC=ldscripts/${EMULATION_NAME}.xc.tmp
303    ( echo "/* Script for --shared -z combreloc: shared library, combine & sort relocs */"
304      . ${CUSTOMIZER_SCRIPT} ${EMULATION_NAME}
305      . ${srcdir}/scripttempl/${SCRIPT_NAME}.sc
306    ) | sed -e '/^ *$/d;s/[ 	]*$//' > ldscripts/${EMULATION_NAME}.xsc
307    rm -f ${COMBRELOC}
308    COMBRELOC=
309  fi
310  unset CREATE_SHLIB
311fi
312
313if test -n "$GENERATE_PIE_SCRIPT"; then
314  LD_FLAG=pie
315  DATA_ALIGNMENT=${DATA_ALIGNMENT_s-${DATA_ALIGNMENT_}}
316  CREATE_PIE=" "
317  # Note that TEXT_START_ADDR is set to NONPAGED_TEXT_START_ADDR.
318  (
319    echo "/* Script for ld -pie: link position independent executable */"
320    . ${CUSTOMIZER_SCRIPT} ${EMULATION_NAME}
321    . ${srcdir}/scripttempl/${SCRIPT_NAME}.sc
322  ) | sed -e '/^ *$/d;s/[ 	]*$//' > ldscripts/${EMULATION_NAME}.xd
323  if test -n "$GENERATE_COMBRELOC_SCRIPT"; then
324    LD_FLAG=cpie
325    DATA_ALIGNMENT=${DATA_ALIGNMENT_sc-${DATA_ALIGNMENT}}
326    COMBRELOC=ldscripts/${EMULATION_NAME}.xc.tmp
327    ( echo "/* Script for -pie -z combreloc: position independent executable, combine & sort relocs */"
328      . ${CUSTOMIZER_SCRIPT} ${EMULATION_NAME}
329      . ${srcdir}/scripttempl/${SCRIPT_NAME}.sc
330    ) | sed -e '/^ *$/d;s/[ 	]*$//' > ldscripts/${EMULATION_NAME}.xdc
331    rm -f ${COMBRELOC}
332    COMBRELOC=
333  fi
334  unset CREATE_PIE
335fi
336
337case " $EMULATION_LIBPATH " in
338    *" ${EMULATION_NAME} "*) COMPILE_IN=true;;
339esac
340
341# Generate e${EMULATION_NAME}.c.
342. ${srcdir}/emultempl/${TEMPLATE_NAME-generic}.em
343