ld/genscripts.sh

   1 #!/bin/sh
   2 # genscripts.sh - generate the ld-emulation-target specific files
   3 # Copyright 2007, 2008 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 #          this_emulation \
  34 # optional:
  35 #          tool_dir \
  36 #          customizer_script
  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 EMULATION_NAME=$2
  93 TOOL_LIB=$3
  94 CUSTOMIZER_SCRIPT=$4
  95
  96 # Can't use ${TOOL_LIB:-$target_alias} here due to an Ultrix shell bug.
  97 if [ "x${TOOL_LIB}" = "x" ] ; then
  98   tool_lib=${exec_prefix}/${target_alias}/lib
  99 else
 100   tool_lib=${exec_prefix}/${TOOL_LIB}/lib
 101 fi
 102
 103 if [ "x${CUSTOMIZER_SCRIPT}" = "x" ] ; then
 104   CUSTOMIZER_SCRIPT=${EMULATION_NAME}
 105 fi
 106 CUSTOMIZER_SCRIPT="${srcdir}/emulparams/${CUSTOMIZER_SCRIPT}.sh"
 107
 108 # Include the emulation-specific parameters:
 109 . ${CUSTOMIZER_SCRIPT}
 110
 111 if test -d ldscripts; then
 112   true
 113 else
 114   mkdir ldscripts
 115 fi
 116
 117 # Set some flags for the emultempl scripts.  USE_LIBPATH will
 118 # be set for any libpath-using emulation; NATIVE will be set for a
 119 # libpath-using emulation where ${host} = ${target}.  NATIVE
 120 # may already have been set by the emulparams file, but that's OK
 121 # (it'll just get set to "yes" twice).
 122
 123 case " $EMULATION_LIBPATH " in
 124   *" ${EMULATION_NAME} "*)
 125     if [ "x${host}" = "x${target}" ] ; then
 126       NATIVE=yes
 127       USE_LIBPATH=yes
 128     elif [ "x${use_sysroot}" = "xyes" ] ; then
 129       USE_LIBPATH=yes
 130     fi
 131     ;;
 132 esac
 133
 134 # If the emulparams file sets NATIVE, make sure USE_LIBPATH is set also.
 135 if test "x$NATIVE" = "xyes" ; then
 136   USE_LIBPATH=yes
 137 fi
 138
 139 # Set the library search path, for libraries named by -lfoo.
 140 # If LIB_PATH is defined (e.g., by Makefile) and non-empty, it is used.
 141 # Otherwise, the default is set here.
 142 #
 143 # The format is the usual list of colon-separated directories.
 144 # To force a logically empty LIB_PATH, do LIBPATH=":".
 145 #
 146 # If we are using a sysroot, prefix library paths with "=" to indicate this.
 147 #
 148 # If the emulparams file set LIBPATH_SUFFIX, prepend an extra copy of
 149 # the library path with the suffix applied.
 150
 151 if [ "x${LIB_PATH}" = "x" ] && [ "x${USE_LIBPATH}" = xyes ] ; then
 152   LIB_PATH2=
 153
 154   libs=${NATIVE_LIB_DIRS}
 155   if [ "x${use_sysroot}" != "xyes" ] ; then
 156     case " ${libs} " in
 157       *" ${libdir} "*) ;;
 158       *) libs="${libdir} ${libs}" ;;
 159     esac
 160     case " ${libs} " in
 161       *" ${tool_lib} "*) ;;
 162       *) libs="${tool_lib} ${libs}" ;;
 163     esac
 164   fi
 165
 166   for lib in ${libs}; do
 167     # The "=" is harmless if we aren't using a sysroot, but also needless.
 168     if [ "x${use_sysroot}" = "xyes" ] ; then
 169       lib="=${lib}"
 170     fi
 171     addsuffix=
 172     case "${LIBPATH_SUFFIX}:${lib}" in
 173       :*) ;;
 174       *:*${LIBPATH_SUFFIX}) ;;
 175       *) addsuffix=yes ;;
 176     esac
 177     if test -n "$addsuffix"; then
 178       case :${LIB_PATH}: in
 179         *:${lib}${LIBPATH_SUFFIX}:*) ;;
 180         ::) LIB_PATH=${lib}${LIBPATH_SUFFIX} ;;
 181         *) LIB_PATH=${LIB_PATH}:${lib}${LIBPATH_SUFFIX} ;;
 182       esac
 183       case :${LIB_PATH}:${LIB_PATH2}: in
 184         *:${lib}:*) ;;
 185         *::) LIB_PATH2=${lib} ;;
 186         *) LIB_PATH2=${LIB_PATH2}:${lib} ;;
 187       esac
 188     else
 189       case :${LIB_PATH2}: in
 190         *:${lib}:*) ;;
 191         ::) LIB_PATH2=${lib} ;;
 192         *) LIB_PATH2=${LIB_PATH2}:${lib} ;;
 193       esac
 194     fi
 195   done
 196
 197   case :${LIB_PATH}:${LIB_PATH2}: in
 198     *:: | ::*) LIB_PATH=${LIB_PATH}${LIB_PATH2} ;;
 199     *) LIB_PATH=${LIB_PATH}:${LIB_PATH2} ;;
 200   esac
 201
 202   # For multilib'ed targets, ensure both ${target_alias}/lib${LIBPATH_SUFFIX}
 203   # and ${TOOL_LIB}/lib${LIBPATH_SUFFIX} are in the default search path, because
 204   # 64bit libraries may be in both places, depending on cross-development
 205   # setup method (e.g.: /usr/s390x-linux/lib64 vs /usr/s390-linux/lib64)
 206   case "${LIBPATH_SUFFIX}:${tool_lib}" in
 207     :*) ;;
 208     *:*${LIBPATH_SUFFIX}) ;;
 209     *)
 210       paths="${exec_prefix}/${target_alias}/lib${LIBPATH_SUFFIX}"
 211       if [ x"${TOOL_LIB}" != x ]; then
 212         paths="${paths} ${exec_prefix}/${TOOL_LIB}/lib${LIBPATH_SUFFIX}"
 213       fi
 214       for path in $paths; do
 215         case :${LIB_PATH}: in
 216           ::: | *:${path}:*) ;;
 217           *) LIB_PATH=${path}:${LIB_PATH} ;;
 218         esac
 219       done
 220     ;;
 221   esac
 222 fi
 223
 224 # Always search $(tooldir)/lib, aka /usr/local/TARGET/lib, except for
 225 # sysrooted configurations and when LIBPATH=":".
 226 if [ "x${use_sysroot}" != "xyes" ] ; then
 227   case :${LIB_PATH}: in
 228   ::: | *:${tool_lib}:*) ;;
 229   ::) LIB_PATH=${tool_lib} ;;
 230   *) LIB_PATH=${tool_lib}:${LIB_PATH} ;;
 231   esac
 232   # For multilib targets, search both $tool_lib dirs
 233   if [ "x${LIBPATH_SUFFIX}" != "x" ] ; then
 234     case :${LIB_PATH}: in
 235       ::: | *:${tool_lib}${LIBPATH_SUFFIX}:*) ;;
 236       ::) LIB_PATH=${tool_lib}${LIBPATH_SUFFIX} ;;
 237       *) LIB_PATH=${tool_lib}${LIBPATH_SUFFIX}:${LIB_PATH} ;;
 238     esac
 239   fi
 240 fi
 241
 242 LIB_SEARCH_DIRS=`echo ${LIB_PATH} | sed -e 's/:/ /g' -e 's/\([^ ][^ ]*\)/SEARCH_DIR(\\"\1\\");/g'`
 243
 244 # We need it for testsuite.
 245 set $EMULATION_LIBPATH
 246 if [ "x$1" = "x$EMULATION_NAME" ]; then
 247     test -d tmpdir || mkdir tmpdir
 248     rm -f tmpdir/libpath.exp
 249     echo "set libpath \"${LIB_PATH}\"" | sed -e 's/:/ /g' > tmpdir/libpath.exp
 250 fi
 251
 252 # Generate 5 or 6 script files from a master script template in
 253 # ${srcdir}/scripttempl/${SCRIPT_NAME}.sh.  Which one of the 5 or 6
 254 # script files is actually used depends on command line options given
 255 # to ld.  (SCRIPT_NAME was set in the emulparams_file.)
 256 #
 257 # A .x script file is the default script.
 258 # A .xr script is for linking without relocation (-r flag).
 259 # A .xu script is like .xr, but *do* create constructors (-Ur flag).
 260 # A .xn script is for linking with -n flag (mix text and data on same page).
 261 # A .xbn script is for linking with -N flag (mix text and data on same page).
 262 # A .xs script is for generating a shared library with the --shared
 263 #   flag; it is only generated if $GENERATE_SHLIB_SCRIPT is set by the
 264 #   emulation parameters.
 265 # A .xc script is for linking with -z combreloc; it is only generated if
 266 #   $GENERATE_COMBRELOC_SCRIPT is set by the emulation parameters or
 267 #   $SCRIPT_NAME is "elf".
 268 # A .xsc script is for linking with --shared -z combreloc; it is generated
 269 #   if $GENERATE_COMBRELOC_SCRIPT is set by the emulation parameters or
 270 #   $SCRIPT_NAME is "elf" and $GENERATE_SHLIB_SCRIPT is set by the emulation
 271 #   parameters too.
 272
 273 if [ "x$SCRIPT_NAME" = "xelf" ]; then
 274   GENERATE_COMBRELOC_SCRIPT=yes
 275 fi
 276
 277 SEGMENT_SIZE=${SEGMENT_SIZE-${MAXPAGESIZE-${TARGET_PAGE_SIZE}}}
 278
 279 # Determine DATA_ALIGNMENT for the 5 variants, using
 280 # values specified in the emulparams/<script_to_run>.sh file or default.
 281
 282 DATA_ALIGNMENT_="${DATA_ALIGNMENT_-${DATA_ALIGNMENT-ALIGN(${SEGMENT_SIZE})}}"
 283 DATA_ALIGNMENT_n="${DATA_ALIGNMENT_n-${DATA_ALIGNMENT_}}"
 284 DATA_ALIGNMENT_N="${DATA_ALIGNMENT_N-${DATA_ALIGNMENT-.}}"
 285 DATA_ALIGNMENT_r="${DATA_ALIGNMENT_r-${DATA_ALIGNMENT-}}"
 286 DATA_ALIGNMENT_u="${DATA_ALIGNMENT_u-${DATA_ALIGNMENT_r}}"
 287
 288 LD_FLAG=r
 289 DATA_ALIGNMENT=${DATA_ALIGNMENT_r}
 290 DEFAULT_DATA_ALIGNMENT="ALIGN(${SEGMENT_SIZE})"
 291 ( echo "/* Script for ld -r: link without relocation */"
 292   . ${CUSTOMIZER_SCRIPT}
 293   . ${srcdir}/scripttempl/${SCRIPT_NAME}.sc
 294 ) | sed -e '/^ *$/d;s/[         ]*$//' > ldscripts/${EMULATION_NAME}.xr
 295
 296 LD_FLAG=u
 297 DATA_ALIGNMENT=${DATA_ALIGNMENT_u}
 298 CONSTRUCTING=" "
 299 ( echo "/* Script for ld -Ur: link w/out relocation, do create constructors */"
 300   . ${CUSTOMIZER_SCRIPT}
 301   . ${srcdir}/scripttempl/${SCRIPT_NAME}.sc
 302 ) | sed -e '/^ *$/d;s/[         ]*$//' > ldscripts/${EMULATION_NAME}.xu
 303
 304 LD_FLAG=
 305 DATA_ALIGNMENT=${DATA_ALIGNMENT_}
 306 RELOCATING=" "
 307 ( echo "/* Default linker script, for normal executables */"
 308   . ${CUSTOMIZER_SCRIPT}
 309   . ${srcdir}/scripttempl/${SCRIPT_NAME}.sc
 310 ) | sed -e '/^ *$/d;s/[         ]*$//' > ldscripts/${EMULATION_NAME}.x
 311
 312 LD_FLAG=n
 313 DATA_ALIGNMENT=${DATA_ALIGNMENT_n}
 314 ( echo "/* Script for -n: mix text and data on same page */"
 315   . ${CUSTOMIZER_SCRIPT}
 316   . ${srcdir}/scripttempl/${SCRIPT_NAME}.sc
 317 ) | sed -e '/^ *$/d;s/[         ]*$//' > ldscripts/${EMULATION_NAME}.xn
 318
 319 LD_FLAG=N
 320 DATA_ALIGNMENT=${DATA_ALIGNMENT_N}
 321 ( echo "/* Script for -N: mix text and data on same page; don't align data */"
 322   . ${CUSTOMIZER_SCRIPT}
 323   . ${srcdir}/scripttempl/${SCRIPT_NAME}.sc
 324 ) | sed -e '/^ *$/d;s/[         ]*$//' > ldscripts/${EMULATION_NAME}.xbn
 325
 326 if test -n "$GENERATE_COMBRELOC_SCRIPT"; then
 327   DATA_ALIGNMENT=${DATA_ALIGNMENT_c-${DATA_ALIGNMENT_}}
 328   LD_FLAG=c
 329   COMBRELOC=ldscripts/${EMULATION_NAME}.xc.tmp
 330   ( echo "/* Script for -z combreloc: combine and sort reloc sections */"
 331     . ${CUSTOMIZER_SCRIPT}
 332     . ${srcdir}/scripttempl/${SCRIPT_NAME}.sc
 333   ) | sed -e '/^ *$/d;s/[       ]*$//' > ldscripts/${EMULATION_NAME}.xc
 334   rm -f ${COMBRELOC}
 335   LD_FLAG=w
 336   RELRO_NOW=" "
 337   COMBRELOC=ldscripts/${EMULATION_NAME}.xw.tmp
 338   ( echo "/* Script for -z combreloc -z now -z relro: combine and sort reloc sections */"
 339     . ${CUSTOMIZER_SCRIPT}
 340     . ${srcdir}/scripttempl/${SCRIPT_NAME}.sc
 341   ) | sed -e '/^ *$/d;s/[       ]*$//' > ldscripts/${EMULATION_NAME}.xw
 342   rm -f ${COMBRELOC}
 343   COMBRELOC=
 344   unset RELRO_NOW
 345 fi
 346
 347 if test -n "$GENERATE_SHLIB_SCRIPT"; then
 348   LD_FLAG=shared
 349   DATA_ALIGNMENT=${DATA_ALIGNMENT_s-${DATA_ALIGNMENT_}}
 350   CREATE_SHLIB=" "
 351   (
 352     echo "/* Script for ld --shared: link shared library */"
 353     . ${CUSTOMIZER_SCRIPT}
 354     . ${srcdir}/scripttempl/${SCRIPT_NAME}.sc
 355   ) | sed -e '/^ *$/d;s/[       ]*$//' > ldscripts/${EMULATION_NAME}.xs
 356   if test -n "$GENERATE_COMBRELOC_SCRIPT"; then
 357     LD_FLAG=cshared
 358     DATA_ALIGNMENT=${DATA_ALIGNMENT_sc-${DATA_ALIGNMENT}}
 359     COMBRELOC=ldscripts/${EMULATION_NAME}.xsc.tmp
 360     ( echo "/* Script for --shared -z combreloc: shared library, combine & sort relocs */"
 361       . ${CUSTOMIZER_SCRIPT}
 362       . ${srcdir}/scripttempl/${SCRIPT_NAME}.sc
 363     ) | sed -e '/^ *$/d;s/[     ]*$//' > ldscripts/${EMULATION_NAME}.xsc
 364     rm -f ${COMBRELOC}
 365     LD_FLAG=wshared
 366     RELRO_NOW=" "
 367     COMBRELOC=ldscripts/${EMULATION_NAME}.xsw.tmp
 368     ( echo "/* Script for --shared -z combreloc -z now -z relro: shared library, combine & sort relocs */"
 369       . ${CUSTOMIZER_SCRIPT}
 370       . ${srcdir}/scripttempl/${SCRIPT_NAME}.sc
 371     ) | sed -e '/^ *$/d;s/[     ]*$//' > ldscripts/${EMULATION_NAME}.xsw
 372     rm -f ${COMBRELOC}
 373     COMBRELOC=
 374     unset RELRO_NOW
 375   fi
 376   unset CREATE_SHLIB
 377 fi
 378
 379 if test -n "$GENERATE_PIE_SCRIPT"; then
 380   LD_FLAG=pie
 381   DATA_ALIGNMENT=${DATA_ALIGNMENT_s-${DATA_ALIGNMENT_}}
 382   CREATE_PIE=" "
 383   (
 384     echo "/* Script for ld -pie: link position independent executable */"
 385     . ${CUSTOMIZER_SCRIPT}
 386     . ${srcdir}/scripttempl/${SCRIPT_NAME}.sc
 387   ) | sed -e '/^ *$/d;s/[       ]*$//' > ldscripts/${EMULATION_NAME}.xd
 388   if test -n "$GENERATE_COMBRELOC_SCRIPT"; then
 389     LD_FLAG=cpie
 390     DATA_ALIGNMENT=${DATA_ALIGNMENT_sc-${DATA_ALIGNMENT}}
 391     COMBRELOC=ldscripts/${EMULATION_NAME}.xdc.tmp
 392     ( echo "/* Script for -pie -z combreloc: position independent executable, combine & sort relocs */"
 393       . ${CUSTOMIZER_SCRIPT}
 394       . ${srcdir}/scripttempl/${SCRIPT_NAME}.sc
 395     ) | sed -e '/^ *$/d;s/[     ]*$//' > ldscripts/${EMULATION_NAME}.xdc
 396     rm -f ${COMBRELOC}
 397     LD_FLAG=wpie
 398     RELRO_NOW=" "
 399     COMBRELOC=ldscripts/${EMULATION_NAME}.xdw.tmp
 400     ( echo "/* Script for -pie -z combreloc -z now -z relro: position independent executable, combine & sort relocs */"
 401       . ${CUSTOMIZER_SCRIPT}
 402       . ${srcdir}/scripttempl/${SCRIPT_NAME}.sc
 403     ) | sed -e '/^ *$/d;s/[     ]*$//' > ldscripts/${EMULATION_NAME}.xdw
 404     rm -f ${COMBRELOC}
 405     COMBRELOC=
 406     unset RELRO_NOW
 407   fi
 408   unset CREATE_PIE
 409 fi
 410
 411 if test -n "$GENERATE_AUTO_IMPORT_SCRIPT"; then
 412   LD_FLAG=auto_import
 413   DATA_ALIGNMENT=${DATA_ALIGNMENT_}
 414   (
 415     echo "/* Script for ld --enable-auto-import: Like the default script except read only data is placed into .data  */"
 416     . ${CUSTOMIZER_SCRIPT}
 417     . ${srcdir}/scripttempl/${SCRIPT_NAME}.sc
 418   ) | sed -e '/^ *$/d;s/[       ]*$//' > ldscripts/${EMULATION_NAME}.xa
 419 fi
 420
 421 case " $EMULATION_LIBPATH " in
 422     *" ${EMULATION_NAME} "*) COMPILE_IN=true;;
 423 esac
 424
 425 # PR ld/5652:
 426 # Determine if the shell has support for the variable BASH_LINENO.
 427 # When it is the case, it is only available inside functions.
 428 has_lineno()
 429 {
 430   test "x$BASH_LINENO" != "x"
 431 }
 432
 433 # Enable accruate error source in the compiler error messages, if possible.
 434 if has_lineno; then
 435   . ${srcdir}/genscrba.sh
 436 else
 437   source_em()
 438   {
 439     . $1
 440   }
 441   fragment()
 442   {
 443     cat >> e${EMULATION_NAME}.c
 444   }
 445 fi
 446
 447 # Generate e${EMULATION_NAME}.c.
 448 # Start with an empty file, then the sourced .em script
 449 # can use the "fragment" function to append.
 450 > e${EMULATION_NAME}.c
 451 source_em ${srcdir}/emultempl/${TEMPLATE_NAME-generic}.em