ld/genscripts.sh

   1 #!/bin/sh
   2 # genscripts.sh - generate the ld-emulation-target specific files
   3 # Copyright 2004, 2006, 2007, 2008, 2009 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 #          customizer_script
  38 #
  39 # Sample usage:
  40 #
  41 #   genscripts_extra.sh \
  42 #    /sources/ld \
  43 #    /usr/local/lib \
  44 #    /usr/local \
  45 #    /usr/local \
  46 #    sparc-sun-sunos4.1.3 \
  47 #    sparc-sun-sunos4.1.3 \
  48 #    sparc-sun-sunos4.1.3 \
  49 #    sun4 \
  50 #    "" \
  51 #    no \
  52 #    sun3 \
  53 #    sparc-sun-sunos4.1.3 \
  54 #    sparc.sh
  55 #
  56 # produces the linker scripts:
  57 #
  58 #   sun3.x       [default linker script]
  59 #   sun3.xbn     [used when the linker is invoked with "-N"]
  60 #   sun3.xn      [used when the linker is invoked with "-n"]
  61 #   sun3.xr      [used when the linker is invoked with "-r"]
  62 #   sun3.xu      [used when the linker is invoked with "-Ur"]
  63 # and maybe:
  64 #   sun3.xc      [used when the linker is invoked with "-z combreloc"]
  65 #   sun3.xsc     [used when the linker is invoked with "--shared"]
  66 #   sun3.xdc     [used when the linker is invoked with "-pie"]
  67 #   sun3.xa      [used when the linker is invoked with "--enable-auto-import"]
  68 #
  69 # It also produced the C source file:
  70 #
  71 #   em_sun3.c
  72 #
  73 # which is then compiled into the linker.
  74 #
  75 # The linker scripts are created by running the shell script
  76 # /sources/ld/emulparams/sparc.sh to set the value of ${SCRIPT_NAME}
  77 # (and any other variables it wants to).  ${SCRIPT_NAME} is then
  78 # invoked with a variable called ${LD_FLAG} to tell it which version
  79 # of the linker script to create.
  80
  81
  82 srcdir=$1
  83 libdir=$2
  84 prefix=$3
  85 exec_prefix=$4
  86 host=$5
  87 target=$6
  88 target_alias=$7
  89 EMULATION_LIBPATH=$8
  90 NATIVE_LIB_DIRS=$9
  91 shift 9
  92 use_sysroot=$1
  93 ENABLE_INITFINI_ARRAY=$2
  94 EMULATION_NAME=$3
  95 TOOL_LIB=$4
  96 CUSTOMIZER_SCRIPT=$5
  97
  98 if [ "x${CUSTOMIZER_SCRIPT}" = "x" ] ; then
  99   CUSTOMIZER_SCRIPT=${EMULATION_NAME}
 100 fi
 101 CUSTOMIZER_SCRIPT="${srcdir}/emulparams/${CUSTOMIZER_SCRIPT}.sh"
 102
 103 # Include the emulation-specific parameters:
 104 . ${CUSTOMIZER_SCRIPT}
 105
 106 if test -d ldscripts; then
 107   true
 108 else
 109   mkdir ldscripts
 110 fi
 111
 112 # Set some flags for the emultempl scripts.  USE_LIBPATH will
 113 # be set for any libpath-using emulation; NATIVE will be set for a
 114 # libpath-using emulation where ${host} = ${target}.  NATIVE
 115 # may already have been set by the emulparams file, but that's OK
 116 # (it'll just get set to "yes" twice).
 117
 118 case " $EMULATION_LIBPATH " in
 119   *" ${EMULATION_NAME} "*)
 120     if [ "x${host}" = "x${target}" ] ; then
 121       NATIVE=yes
 122       USE_LIBPATH=yes
 123     elif [ "x${use_sysroot}" = "xyes" ] ; then
 124       USE_LIBPATH=yes
 125     fi
 126     ;;
 127 esac
 128
 129 # If the emulparams file sets NATIVE, make sure USE_LIBPATH is set also.
 130 if test "x$NATIVE" = "xyes" ; then
 131   USE_LIBPATH=yes
 132 fi
 133
 134 # Set the library search path, for libraries named by -lfoo.
 135 # If LIB_PATH is defined (e.g., by Makefile) and non-empty, it is used.
 136 # Otherwise, the default is set here.
 137 #
 138 # The format is the usual list of colon-separated directories.
 139 # To force a logically empty LIB_PATH, do LIBPATH=":".
 140 #
 141 # If we are using a sysroot, prefix library paths with "=" to indicate this.
 142 #
 143 # If the emulparams file set LIBPATH_SUFFIX, prepend an extra copy of
 144 # the library path with the suffix applied.
 145
 146 # Paths with LIBPATH_SUFFIX
 147 lib_path1=
 148 # Paths without LIBPATH_SUFFIX
 149 lib_path2=
 150 if [ "${LIB_PATH}" != ":" ] ; then
 151   lib_path2=${LIB_PATH}
 152 fi
 153
 154 # Add args to lib_path1 and lib_path2, discarding any duplicates
 155 append_to_lib_path()
 156 {
 157   if [ $# != 0 ]; then
 158     for lib in "$@"; do
 159       # The "=" is harmless if we aren't using a sysroot, but also needless.
 160       if [ "x${use_sysroot}" = "xyes" ] ; then
 161         lib="=${lib}"
 162       fi
 163       if test -n "${LIBPATH_SUFFIX}"; then
 164         case "${lib}" in
 165           *${LIBPATH_SUFFIX})
 166             case :${lib_path1}: in
 167               *:${lib}:*) ;;
 168               ::) lib_path1=${lib} ;;
 169               *) lib_path1=${lib_path1}:${lib} ;;
 170             esac ;;
 171           *)
 172             case :${lib_path1}: in
 173               *:${lib}${LIBPATH_SUFFIX}:*) ;;
 174               ::) lib_path1=${lib}${LIBPATH_SUFFIX} ;;
 175               *) lib_path1=${lib_path1}:${lib}${LIBPATH_SUFFIX} ;;
 176             esac ;;
 177         esac
 178       fi
 179       case :${lib_path1}:${lib_path2}: in
 180         *:${lib}:*) ;;
 181         *::) lib_path2=${lib} ;;
 182         *) lib_path2=${lib_path2}:${lib} ;;
 183       esac
 184     done
 185   fi
 186 }
 187
 188 # Always search $(tooldir)/lib, aka /usr/local/TARGET/lib when native
 189 # except when LIBPATH=":".
 190 if [ "${LIB_PATH}" != ":" ] ; then
 191   libs=
 192   if [ "x${TOOL_LIB}" = "x" ] ; then
 193     if [ "x${NATIVE}" = "xyes" ] ; then
 194       libs="${exec_prefix}/${target_alias}/lib"
 195     fi
 196   else
 197     # For multilib'ed targets, ensure both ${target_alias}/lib${LIBPATH_SUFFIX}
 198     # and ${TOOL_LIB}/lib${LIBPATH_SUFFIX} are in the default search path,
 199     # because 64bit libraries may be in both places, depending on
 200     # cross-development setup method (e.g.: /usr/s390x-linux/lib64
 201     # vs. /usr/s390-linux/lib64)
 202     case "${NATIVE}:${LIBPATH_SUFFIX}:${TOOL_LIB}" in
 203       :* | *::* | *:*:*${LIBPATH_SUFFIX}) ;;
 204       *) libs="${exec_prefix}/${target_alias}/lib${LIBPATH_SUFFIX}" ;;
 205     esac
 206     libs="${exec_prefix}/${TOOL_LIB}/lib ${libs}"
 207   fi
 208   append_to_lib_path ${libs}
 209 fi
 210
 211 if [ "x${LIB_PATH}" = "x" ] && [ "x${USE_LIBPATH}" = xyes ] ; then
 212   libs=${NATIVE_LIB_DIRS}
 213   if [ "x${NATIVE}" = "xyes" ] ; then
 214     case " ${libs} " in
 215       *" ${libdir} "*) ;;
 216       *) libs="${libdir} ${libs}" ;;
 217     esac
 218   fi
 219   append_to_lib_path ${libs}
 220 fi
 221
 222 case :${lib_path1}:${lib_path2}: in
 223   *:: | ::*) LIB_PATH=${lib_path1}${lib_path2} ;;
 224   *) LIB_PATH=${lib_path1}:${lib_path2} ;;
 225 esac
 226
 227 LIB_SEARCH_DIRS=`echo ${LIB_PATH} | sed -e 's/:/ /g' -e 's/\([^ ][^ ]*\)/SEARCH_DIR(\\"\1\\");/g'`
 228
 229 # We need it for testsuite.
 230 set $EMULATION_LIBPATH
 231 if [ "x$1" = "x$EMULATION_NAME" ]; then
 232     test -d tmpdir || mkdir tmpdir
 233     rm -f tmpdir/libpath.exp
 234     echo "set libpath \"${LIB_PATH}\"" | sed -e 's/:/ /g' > tmpdir/libpath.exp
 235 fi
 236
 237 # Generate 5 or 6 script files from a master script template in
 238 # ${srcdir}/scripttempl/${SCRIPT_NAME}.sh.  Which one of the 5 or 6
 239 # script files is actually used depends on command line options given
 240 # to ld.  (SCRIPT_NAME was set in the emulparams_file.)
 241 #
 242 # A .x script file is the default script.
 243 # A .xr script is for linking without relocation (-r flag).
 244 # A .xu script is like .xr, but *do* create constructors (-Ur flag).
 245 # A .xn script is for linking with -n flag (mix text and data on same page).
 246 # A .xbn script is for linking with -N flag (mix text and data on same page).
 247 # A .xs script is for generating a shared library with the --shared
 248 #   flag; it is only generated if $GENERATE_SHLIB_SCRIPT is set by the
 249 #   emulation parameters.
 250 # A .xc script is for linking with -z combreloc; it is only generated if
 251 #   $GENERATE_COMBRELOC_SCRIPT is set by the emulation parameters or
 252 #   $SCRIPT_NAME is "elf".
 253 # A .xsc script is for linking with --shared -z combreloc; it is generated
 254 #   if $GENERATE_COMBRELOC_SCRIPT is set by the emulation parameters or
 255 #   $SCRIPT_NAME is "elf" and $GENERATE_SHLIB_SCRIPT is set by the emulation
 256 #   parameters too.
 257
 258 if [ "x$SCRIPT_NAME" = "xelf" ]; then
 259   GENERATE_COMBRELOC_SCRIPT=yes
 260 fi
 261
 262 SEGMENT_SIZE=${SEGMENT_SIZE-${MAXPAGESIZE-${TARGET_PAGE_SIZE}}}
 263
 264 # Determine DATA_ALIGNMENT for the 5 variants, using
 265 # values specified in the emulparams/<script_to_run>.sh file or default.
 266
 267 DATA_ALIGNMENT_="${DATA_ALIGNMENT_-${DATA_ALIGNMENT-ALIGN(${SEGMENT_SIZE})}}"
 268 DATA_ALIGNMENT_n="${DATA_ALIGNMENT_n-${DATA_ALIGNMENT_}}"
 269 DATA_ALIGNMENT_N="${DATA_ALIGNMENT_N-${DATA_ALIGNMENT-.}}"
 270 DATA_ALIGNMENT_r="${DATA_ALIGNMENT_r-${DATA_ALIGNMENT-}}"
 271 DATA_ALIGNMENT_u="${DATA_ALIGNMENT_u-${DATA_ALIGNMENT_r}}"
 272
 273 LD_FLAG=r
 274 DATA_ALIGNMENT=${DATA_ALIGNMENT_r}
 275 DEFAULT_DATA_ALIGNMENT="ALIGN(${SEGMENT_SIZE})"
 276 ( echo "/* Script for ld -r: link without relocation */"
 277   . ${CUSTOMIZER_SCRIPT}
 278   . ${srcdir}/scripttempl/${SCRIPT_NAME}.sc
 279 ) | sed -e '/^ *$/d;s/[         ]*$//' > ldscripts/${EMULATION_NAME}.xr
 280
 281 LD_FLAG=u
 282 DATA_ALIGNMENT=${DATA_ALIGNMENT_u}
 283 CONSTRUCTING=" "
 284 ( echo "/* Script for ld -Ur: link w/out relocation, do create constructors */"
 285   . ${CUSTOMIZER_SCRIPT}
 286   . ${srcdir}/scripttempl/${SCRIPT_NAME}.sc
 287 ) | sed -e '/^ *$/d;s/[         ]*$//' > ldscripts/${EMULATION_NAME}.xu
 288
 289 LD_FLAG=
 290 DATA_ALIGNMENT=${DATA_ALIGNMENT_}
 291 RELOCATING=" "
 292 ( echo "/* Default linker script, for normal executables */"
 293   . ${CUSTOMIZER_SCRIPT}
 294   . ${srcdir}/scripttempl/${SCRIPT_NAME}.sc
 295 ) | sed -e '/^ *$/d;s/[         ]*$//' > ldscripts/${EMULATION_NAME}.x
 296
 297 LD_FLAG=n
 298 DATA_ALIGNMENT=${DATA_ALIGNMENT_n}
 299 ( echo "/* Script for -n: mix text and data on same page */"
 300   . ${CUSTOMIZER_SCRIPT}
 301   . ${srcdir}/scripttempl/${SCRIPT_NAME}.sc
 302 ) | sed -e '/^ *$/d;s/[         ]*$//' > ldscripts/${EMULATION_NAME}.xn
 303
 304 LD_FLAG=N
 305 DATA_ALIGNMENT=${DATA_ALIGNMENT_N}
 306 ( echo "/* Script for -N: mix text and data on same page; don't align data */"
 307   . ${CUSTOMIZER_SCRIPT}
 308   . ${srcdir}/scripttempl/${SCRIPT_NAME}.sc
 309 ) | sed -e '/^ *$/d;s/[         ]*$//' > ldscripts/${EMULATION_NAME}.xbn
 310
 311 if test -n "$GENERATE_COMBRELOC_SCRIPT"; then
 312   DATA_ALIGNMENT=${DATA_ALIGNMENT_c-${DATA_ALIGNMENT_}}
 313   LD_FLAG=c
 314   COMBRELOC=ldscripts/${EMULATION_NAME}.xc.tmp
 315   ( echo "/* Script for -z combreloc: combine and sort reloc sections */"
 316     . ${CUSTOMIZER_SCRIPT}
 317     . ${srcdir}/scripttempl/${SCRIPT_NAME}.sc
 318   ) | sed -e '/^ *$/d;s/[       ]*$//' > ldscripts/${EMULATION_NAME}.xc
 319   rm -f ${COMBRELOC}
 320   LD_FLAG=w
 321   RELRO_NOW=" "
 322   COMBRELOC=ldscripts/${EMULATION_NAME}.xw.tmp
 323   ( echo "/* Script for -z combreloc -z now -z relro: combine and sort reloc sections */"
 324     . ${CUSTOMIZER_SCRIPT}
 325     . ${srcdir}/scripttempl/${SCRIPT_NAME}.sc
 326   ) | sed -e '/^ *$/d;s/[       ]*$//' > ldscripts/${EMULATION_NAME}.xw
 327   rm -f ${COMBRELOC}
 328   COMBRELOC=
 329   unset RELRO_NOW
 330 fi
 331
 332 if test -n "$GENERATE_SHLIB_SCRIPT"; then
 333   LD_FLAG=shared
 334   DATA_ALIGNMENT=${DATA_ALIGNMENT_s-${DATA_ALIGNMENT_}}
 335   CREATE_SHLIB=" "
 336   (
 337     echo "/* Script for ld --shared: link shared library */"
 338     . ${CUSTOMIZER_SCRIPT}
 339     . ${srcdir}/scripttempl/${SCRIPT_NAME}.sc
 340   ) | sed -e '/^ *$/d;s/[       ]*$//' > ldscripts/${EMULATION_NAME}.xs
 341   if test -n "$GENERATE_COMBRELOC_SCRIPT"; then
 342     LD_FLAG=cshared
 343     DATA_ALIGNMENT=${DATA_ALIGNMENT_sc-${DATA_ALIGNMENT}}
 344     COMBRELOC=ldscripts/${EMULATION_NAME}.xsc.tmp
 345     ( echo "/* Script for --shared -z combreloc: shared library, combine & sort relocs */"
 346       . ${CUSTOMIZER_SCRIPT}
 347       . ${srcdir}/scripttempl/${SCRIPT_NAME}.sc
 348     ) | sed -e '/^ *$/d;s/[     ]*$//' > ldscripts/${EMULATION_NAME}.xsc
 349     rm -f ${COMBRELOC}
 350     LD_FLAG=wshared
 351     RELRO_NOW=" "
 352     COMBRELOC=ldscripts/${EMULATION_NAME}.xsw.tmp
 353     ( echo "/* Script for --shared -z combreloc -z now -z relro: shared library, combine & sort relocs */"
 354       . ${CUSTOMIZER_SCRIPT}
 355       . ${srcdir}/scripttempl/${SCRIPT_NAME}.sc
 356     ) | sed -e '/^ *$/d;s/[     ]*$//' > ldscripts/${EMULATION_NAME}.xsw
 357     rm -f ${COMBRELOC}
 358     COMBRELOC=
 359     unset RELRO_NOW
 360   fi
 361   unset CREATE_SHLIB
 362 fi
 363
 364 if test -n "$GENERATE_PIE_SCRIPT"; then
 365   LD_FLAG=pie
 366   DATA_ALIGNMENT=${DATA_ALIGNMENT_s-${DATA_ALIGNMENT_}}
 367   CREATE_PIE=" "
 368   (
 369     echo "/* Script for ld -pie: link position independent executable */"
 370     . ${CUSTOMIZER_SCRIPT}
 371     . ${srcdir}/scripttempl/${SCRIPT_NAME}.sc
 372   ) | sed -e '/^ *$/d;s/[       ]*$//' > ldscripts/${EMULATION_NAME}.xd
 373   if test -n "$GENERATE_COMBRELOC_SCRIPT"; then
 374     LD_FLAG=cpie
 375     DATA_ALIGNMENT=${DATA_ALIGNMENT_sc-${DATA_ALIGNMENT}}
 376     COMBRELOC=ldscripts/${EMULATION_NAME}.xdc.tmp
 377     ( echo "/* Script for -pie -z combreloc: position independent executable, combine & sort relocs */"
 378       . ${CUSTOMIZER_SCRIPT}
 379       . ${srcdir}/scripttempl/${SCRIPT_NAME}.sc
 380     ) | sed -e '/^ *$/d;s/[     ]*$//' > ldscripts/${EMULATION_NAME}.xdc
 381     rm -f ${COMBRELOC}
 382     LD_FLAG=wpie
 383     RELRO_NOW=" "
 384     COMBRELOC=ldscripts/${EMULATION_NAME}.xdw.tmp
 385     ( echo "/* Script for -pie -z combreloc -z now -z relro: position independent executable, combine & sort relocs */"
 386       . ${CUSTOMIZER_SCRIPT}
 387       . ${srcdir}/scripttempl/${SCRIPT_NAME}.sc
 388     ) | sed -e '/^ *$/d;s/[     ]*$//' > ldscripts/${EMULATION_NAME}.xdw
 389     rm -f ${COMBRELOC}
 390     COMBRELOC=
 391     unset RELRO_NOW
 392   fi
 393   unset CREATE_PIE
 394 fi
 395
 396 if test -n "$GENERATE_AUTO_IMPORT_SCRIPT"; then
 397   LD_FLAG=auto_import
 398   DATA_ALIGNMENT=${DATA_ALIGNMENT_}
 399   (
 400     echo "/* Script for ld --enable-auto-import: Like the default script except read only data is placed into .data  */"
 401     . ${CUSTOMIZER_SCRIPT}
 402     . ${srcdir}/scripttempl/${SCRIPT_NAME}.sc
 403   ) | sed -e '/^ *$/d;s/[       ]*$//' > ldscripts/${EMULATION_NAME}.xa
 404 fi
 405
 406 case " $EMULATION_LIBPATH " in
 407     *" ${EMULATION_NAME} "*) COMPILE_IN=true;;
 408 esac
 409
 410 # PR ld/5652:
 411 # Determine if the shell has support for the variable BASH_LINENO.
 412 # When it is the case, it is only available inside functions.
 413 has_lineno()
 414 {
 415   test "x$BASH_LINENO" != "x"
 416 }
 417
 418 # Enable accruate error source in the compiler error messages, if possible.
 419 if has_lineno; then
 420   . ${srcdir}/genscrba.sh
 421 else
 422   source_em()
 423   {
 424     . $1
 425   }
 426   fragment()
 427   {
 428     cat >> e${EMULATION_NAME}.c
 429   }
 430 fi
 431
 432 # Generate e${EMULATION_NAME}.c.
 433 # Start with an empty file, then the sourced .em script
 434 # can use the "fragment" function to append.
 435 > e${EMULATION_NAME}.c
 436 source_em ${srcdir}/emultempl/${TEMPLATE_NAME-generic}.em