ld/genscripts.sh

   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
  81 srcdir=$1
  82 libdir=$2
  83 prefix=$3
  84 exec_prefix=$4
  85 host=$5
  86 target=$6
  87 target_alias=$7
  88 EMULATION_LIBPATH=$8
  89 NATIVE_LIB_DIRS=$9
  90 shift 9
  91 use_sysroot=$1
  92 ENABLE_INITFINI_ARRAY=$2
  93 EMULATION_NAME=$3
  94 TOOL_LIB=$4
  95
  96 # Include the emulation-specific parameters:
  97 CUSTOMIZER_SCRIPT="${srcdir}/emulparams/${EMULATION_NAME}.sh"
  98 . ${CUSTOMIZER_SCRIPT}
  99
 100 if test -d ldscripts; then
 101   true
 102 else
 103   mkdir ldscripts
 104 fi
 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
 112 case " $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     ;;
 121 esac
 122
 123 # If the emulparams file sets NATIVE, make sure USE_LIBPATH is set also.
 124 if test "x$NATIVE" = "xyes" ; then
 125   USE_LIBPATH=yes
 126 fi
 127
 128 # Set the library search path, for libraries named by -lfoo.
 129 # If LIB_PATH is defined (e.g., by Makefile) and non-empty, it is used.
 130 # Otherwise, the default is set here.
 131 #
 132 # The format is the usual list of colon-separated directories.
 133 # To force a logically empty LIB_PATH, do LIBPATH=":".
 134 #
 135 # If we are using a sysroot, prefix library paths with "=" to indicate this.
 136 #
 137 # If the emulparams file set LIBPATH_SUFFIX, prepend an extra copy of
 138 # the library path with the suffix applied.
 139
 140 # Paths with LIBPATH_SUFFIX
 141 lib_path1=
 142 # Paths without LIBPATH_SUFFIX
 143 lib_path2=
 144 if [ "${LIB_PATH}" != ":" ] ; then
 145   lib_path2=${LIB_PATH}
 146 fi
 147
 148 # Add args to lib_path1 and lib_path2, discarding any duplicates
 149 append_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 $(tooldir)/lib, aka /usr/local/TARGET/lib when native
 193 # except when LIBPATH=":".
 194 if [ "${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 ${libs}
 213 fi
 214
 215 if [ "x${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 ${libs}
 224 fi
 225
 226 case :${lib_path1}:${lib_path2}: in
 227   *:: | ::*) LIB_PATH=${lib_path1}${lib_path2} ;;
 228   *) LIB_PATH=${lib_path1}:${lib_path2} ;;
 229 esac
 230
 231 LIB_SEARCH_DIRS=`echo ${LIB_PATH} | sed -e 's/:/ /g' -e 's/\([^ ][^ ]*\)/SEARCH_DIR(\\"\1\\");/g'`
 232
 233 # We need it for testsuite.
 234 set $EMULATION_LIBPATH
 235 if [ "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
 239 fi
 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 $GENERATE_SHLIB_SCRIPT is set by the emulation
 260 #   parameters too.
 261
 262 if [ "x$SCRIPT_NAME" = "xelf" ]; then
 263   GENERATE_COMBRELOC_SCRIPT=yes
 264 fi
 265
 266 SEGMENT_SIZE=${SEGMENT_SIZE-${MAXPAGESIZE-${TARGET_PAGE_SIZE}}}
 267
 268 # Determine DATA_ALIGNMENT for the 5 variants, using
 269 # values specified in the emulparams/<script_to_run>.sh file or default.
 270
 271 DATA_ALIGNMENT_="${DATA_ALIGNMENT_-${DATA_ALIGNMENT-ALIGN(${SEGMENT_SIZE})}}"
 272 DATA_ALIGNMENT_n="${DATA_ALIGNMENT_n-${DATA_ALIGNMENT_}}"
 273 DATA_ALIGNMENT_N="${DATA_ALIGNMENT_N-${DATA_ALIGNMENT-.}}"
 274 DATA_ALIGNMENT_r="${DATA_ALIGNMENT_r-${DATA_ALIGNMENT-}}"
 275 DATA_ALIGNMENT_u="${DATA_ALIGNMENT_u-${DATA_ALIGNMENT_r}}"
 276
 277 LD_FLAG=r
 278 DATA_ALIGNMENT=${DATA_ALIGNMENT_r}
 279 DEFAULT_DATA_ALIGNMENT="ALIGN(${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/${EMULATION_NAME}.xr
 284
 285 LD_FLAG=u
 286 DATA_ALIGNMENT=${DATA_ALIGNMENT_u}
 287 CONSTRUCTING=" "
 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/${EMULATION_NAME}.xu
 292
 293 LD_FLAG=
 294 DATA_ALIGNMENT=${DATA_ALIGNMENT_}
 295 RELOCATING=" "
 296 ( echo "/* Default linker script, for normal executables */"
 297   . ${CUSTOMIZER_SCRIPT}
 298   . ${srcdir}/scripttempl/${SCRIPT_NAME}.sc
 299 ) | sed -e '/^ *$/d;s/[         ]*$//' > ldscripts/${EMULATION_NAME}.x
 300
 301 LD_FLAG=n
 302 DATA_ALIGNMENT=${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/${EMULATION_NAME}.xn
 307
 308 LD_FLAG=N
 309 DATA_ALIGNMENT=${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/${EMULATION_NAME}.xbn
 314
 315 if test -n "$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 ${COMBRELOC}
 332   COMBRELOC=
 333   unset RELRO_NOW
 334 fi
 335
 336 if test -n "$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 ${COMBRELOC}
 362     COMBRELOC=
 363     unset RELRO_NOW
 364   fi
 365   unset CREATE_SHLIB
 366 fi
 367
 368 if test -n "$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 ${COMBRELOC}
 394     COMBRELOC=
 395     unset RELRO_NOW
 396   fi
 397   unset CREATE_PIE
 398 fi
 399
 400 if test -n "$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/${EMULATION_NAME}.xa
 408 fi
 409
 410 case "$COMPILE_IN: $EMULATION_LIBPATH " in
 411     :*" ${EMULATION_NAME} "*) COMPILE_IN=yes;;
 412 esac
 413
 414 # PR ld/5652:
 415 # Determine if the shell has support for the variable BASH_LINENO.
 416 # When it is the case, it is only available inside functions.
 417 has_lineno()
 418 {
 419   test "x$BASH_LINENO" != "x"
 420 }
 421
 422 # Enable accruate error source in the compiler error messages, if possible.
 423 if has_lineno; then
 424   . ${srcdir}/genscrba.sh
 425 else
 426   source_em()
 427   {
 428     . $1
 429   }
 430   fragment()
 431   {
 432     cat >> e${EMULATION_NAME}.c
 433   }
 434 fi
 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
 440 source_em ${srcdir}/emultempl/${TEMPLATE_NAME-generic}.em