ld/genscripts.sh

   1 #!/bin/sh
   2 # genscripts.sh - generate the ld-emulation-target specific files
   3 # Copyright 2007 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 #
  67 # It also produced the C source file:
  68 #
  69 #   em_sun3.c
  70 #
  71 # which is then compiled into the linker.
  72 #
  73 # The linker scripts are created by running the shell script
  74 # /sources/ld/emulparams/sparc.sh to set the value of ${SCRIPT_NAME}
  75 # (and any other variables it wants to).  ${SCRIPT_NAME} is then
  76 # invoked with a variable called ${LD_FLAG} to tell it which version
  77 # of the linker script to create.
  78
  79
  80 srcdir=$1
  81 libdir=$2
  82 prefix=$3
  83 exec_prefix=$4
  84 host=$5
  85 target=$6
  86 target_alias=$7
  87 EMULATION_LIBPATH=$8
  88 NATIVE_LIB_DIRS=$9
  89 shift 9
  90 use_sysroot=$1
  91 EMULATION_NAME=$2
  92 TOOL_LIB=$3
  93 CUSTOMIZER_SCRIPT=$4
  94
  95 # Can't use ${TOOL_LIB:-$target_alias} here due to an Ultrix shell bug.
  96 if [ "x${TOOL_LIB}" = "x" ] ; then
  97   tool_lib=${exec_prefix}/${target_alias}/lib
  98 else
  99   tool_lib=${exec_prefix}/${TOOL_LIB}/lib
 100 fi
 101
 102 if [ "x${CUSTOMIZER_SCRIPT}" = "x" ] ; then
 103   CUSTOMIZER_SCRIPT=${EMULATION_NAME}
 104 fi
 105 CUSTOMIZER_SCRIPT="${srcdir}/emulparams/${CUSTOMIZER_SCRIPT}.sh"
 106
 107 # Include the emulation-specific parameters:
 108 . ${CUSTOMIZER_SCRIPT} ${EMULATION_NAME}
 109
 110 if test -d ldscripts; then
 111   true
 112 else
 113   mkdir ldscripts
 114 fi
 115
 116 # Set some flags for the emultempl scripts.  USE_LIBPATH will
 117 # be set for any libpath-using emulation; NATIVE will be set for a
 118 # libpath-using emulation where ${host} = ${target}.  NATIVE
 119 # may already have been set by the emulparams file, but that's OK
 120 # (it'll just get set to "yes" twice).
 121
 122 case " $EMULATION_LIBPATH " in
 123   *" ${EMULATION_NAME} "*)
 124     if [ "x${host}" = "x${target}" ] ; then
 125       NATIVE=yes
 126       USE_LIBPATH=yes
 127     elif [ "x${use_sysroot}" = "xyes" ] ; then
 128       USE_LIBPATH=yes
 129     fi
 130     ;;
 131 esac
 132
 133 # If the emulparams file sets NATIVE, make sure USE_LIBPATH is set also.
 134 if test "x$NATIVE" = "xyes" ; then
 135   USE_LIBPATH=yes
 136 fi
 137
 138 # Set the library search path, for libraries named by -lfoo.
 139 # If LIB_PATH is defined (e.g., by Makefile) and non-empty, it is used.
 140 # Otherwise, the default is set here.
 141 #
 142 # The format is the usual list of colon-separated directories.
 143 # To force a logically empty LIB_PATH, do LIBPATH=":".
 144 #
 145 # If we are using a sysroot, prefix library paths with "=" to indicate this.
 146 #
 147 # If the emulparams file set LIBPATH_SUFFIX, prepend an extra copy of
 148 # the library path with the suffix applied.
 149
 150 if [ "x${LIB_PATH}" = "x" ] && [ "x${USE_LIBPATH}" = xyes ] ; then
 151   LIB_PATH2=
 152
 153   libs=${NATIVE_LIB_DIRS}
 154   if [ "x${use_sysroot}" != "xyes" ] ; then
 155     case " ${libs} " in
 156       *" ${libdir} "*) ;;
 157       *) libs="${libdir} ${libs}" ;;
 158     esac
 159     case " ${libs} " in
 160       *" ${tool_lib} "*) ;;
 161       *) libs="${tool_lib} ${libs}" ;;
 162     esac
 163   fi
 164
 165   for lib in ${libs}; do
 166     # The "=" is harmless if we aren't using a sysroot, but also needless.
 167     if [ "x${use_sysroot}" = "xyes" ] ; then
 168       lib="=${lib}"
 169     fi
 170     addsuffix=
 171     case "${LIBPATH_SUFFIX}:${lib}" in
 172       :*) ;;
 173       *:*${LIBPATH_SUFFIX}) ;;
 174       *) addsuffix=yes ;;
 175     esac
 176     if test -n "$addsuffix"; then
 177       case :${LIB_PATH}: in
 178         *:${lib}${LIBPATH_SUFFIX}:*) ;;
 179         ::) LIB_PATH=${lib}${LIBPATH_SUFFIX} ;;
 180         *) LIB_PATH=${LIB_PATH}:${lib}${LIBPATH_SUFFIX} ;;
 181       esac
 182       case :${LIB_PATH}:${LIB_PATH2}: in
 183         *:${lib}:*) ;;
 184         *::) LIB_PATH2=${lib} ;;
 185         *) LIB_PATH2=${LIB_PATH2}:${lib} ;;
 186       esac
 187     else
 188       case :${LIB_PATH2}: in
 189         *:${lib}:*) ;;
 190         ::) LIB_PATH2=${lib} ;;
 191         *) LIB_PATH2=${LIB_PATH2}:${lib} ;;
 192       esac
 193     fi
 194   done
 195
 196   case :${LIB_PATH}:${LIB_PATH2}: in
 197     *:: | ::*) LIB_PATH=${LIB_PATH}${LIB_PATH2} ;;
 198     *) LIB_PATH=${LIB_PATH}:${LIB_PATH2} ;;
 199   esac
 200 fi
 201
 202 # Always search $(tooldir)/lib, aka /usr/local/TARGET/lib, except for
 203 # sysrooted configurations and when LIBPATH=":".
 204 if [ "x${use_sysroot}" != "xyes" ] ; then
 205   case :${LIB_PATH}: in
 206   ::: | *:${tool_lib}:*) ;;
 207   ::) LIB_PATH=${tool_lib} ;;
 208   *) LIB_PATH=${tool_lib}:${LIB_PATH} ;;
 209   esac
 210   # For multilib targets, search both $tool_lib dirs
 211   if [ "x${LIBPATH_SUFFIX}" != "x" ] ; then
 212     case :${LIB_PATH}: in
 213       ::: | *:${tool_lib}${LIBPATH_SUFFIX}:*) ;;
 214       ::) LIB_PATH=${tool_lib}${LIBPATH_SUFFIX} ;;
 215       *) LIB_PATH=${tool_lib}${LIBPATH_SUFFIX}:${LIB_PATH} ;;
 216     esac
 217   fi
 218 fi
 219
 220 LIB_SEARCH_DIRS=`echo ${LIB_PATH} | sed -e 's/:/ /g' -e 's/\([^ ][^ ]*\)/SEARCH_DIR(\\"\1\\");/g'`
 221
 222 # We need it for testsuite.
 223 set $EMULATION_LIBPATH
 224 if [ "x$1" = "x$EMULATION_NAME" ]; then
 225     test -d tmpdir || mkdir tmpdir
 226     rm -f tmpdir/libpath.exp
 227     echo "set libpath \"${LIB_PATH}\"" | sed -e 's/:/ /g' > tmpdir/libpath.exp
 228 fi
 229
 230 # Generate 5 or 6 script files from a master script template in
 231 # ${srcdir}/scripttempl/${SCRIPT_NAME}.sh.  Which one of the 5 or 6
 232 # script files is actually used depends on command line options given
 233 # to ld.  (SCRIPT_NAME was set in the emulparams_file.)
 234 #
 235 # A .x script file is the default script.
 236 # A .xr script is for linking without relocation (-r flag).
 237 # A .xu script is like .xr, but *do* create constructors (-Ur flag).
 238 # A .xn script is for linking with -n flag (mix text and data on same page).
 239 # A .xbn script is for linking with -N flag (mix text and data on same page).
 240 # A .xs script is for generating a shared library with the --shared
 241 #   flag; it is only generated if $GENERATE_SHLIB_SCRIPT is set by the
 242 #   emulation parameters.
 243 # A .xc script is for linking with -z combreloc; it is only generated if
 244 #   $GENERATE_COMBRELOC_SCRIPT is set by the emulation parameters or
 245 #   $SCRIPT_NAME is "elf".
 246 # A .xsc script is for linking with --shared -z combreloc; it is generated
 247 #   if $GENERATE_COMBRELOC_SCRIPT is set by the emulation parameters or
 248 #   $SCRIPT_NAME is "elf" and $GENERATE_SHLIB_SCRIPT is set by the emulation
 249 #   parameters too.
 250
 251 if [ "x$SCRIPT_NAME" = "xelf" ]; then
 252   GENERATE_COMBRELOC_SCRIPT=yes
 253 fi
 254
 255 SEGMENT_SIZE=${SEGMENT_SIZE-${MAXPAGESIZE-${TARGET_PAGE_SIZE}}}
 256
 257 # Determine DATA_ALIGNMENT for the 5 variants, using
 258 # values specified in the emulparams/<script_to_run>.sh file or default.
 259
 260 DATA_ALIGNMENT_="${DATA_ALIGNMENT_-${DATA_ALIGNMENT-ALIGN(${SEGMENT_SIZE})}}"
 261 DATA_ALIGNMENT_n="${DATA_ALIGNMENT_n-${DATA_ALIGNMENT_}}"
 262 DATA_ALIGNMENT_N="${DATA_ALIGNMENT_N-${DATA_ALIGNMENT-.}}"
 263 DATA_ALIGNMENT_r="${DATA_ALIGNMENT_r-${DATA_ALIGNMENT-}}"
 264 DATA_ALIGNMENT_u="${DATA_ALIGNMENT_u-${DATA_ALIGNMENT_r}}"
 265
 266 LD_FLAG=r
 267 DATA_ALIGNMENT=${DATA_ALIGNMENT_r}
 268 DEFAULT_DATA_ALIGNMENT="ALIGN(${SEGMENT_SIZE})"
 269 ( echo "/* Script for ld -r: link without relocation */"
 270   . ${CUSTOMIZER_SCRIPT} ${EMULATION_NAME}
 271   . ${srcdir}/scripttempl/${SCRIPT_NAME}.sc
 272 ) | sed -e '/^ *$/d;s/[         ]*$//' > ldscripts/${EMULATION_NAME}.xr
 273
 274 LD_FLAG=u
 275 DATA_ALIGNMENT=${DATA_ALIGNMENT_u}
 276 CONSTRUCTING=" "
 277 ( echo "/* Script for ld -Ur: link w/out relocation, do create constructors */"
 278   . ${CUSTOMIZER_SCRIPT} ${EMULATION_NAME}
 279   . ${srcdir}/scripttempl/${SCRIPT_NAME}.sc
 280 ) | sed -e '/^ *$/d;s/[         ]*$//' > ldscripts/${EMULATION_NAME}.xu
 281
 282 LD_FLAG=
 283 DATA_ALIGNMENT=${DATA_ALIGNMENT_}
 284 RELOCATING=" "
 285 ( echo "/* Default linker script, for normal executables */"
 286   . ${CUSTOMIZER_SCRIPT} ${EMULATION_NAME}
 287   . ${srcdir}/scripttempl/${SCRIPT_NAME}.sc
 288 ) | sed -e '/^ *$/d;s/[         ]*$//' > ldscripts/${EMULATION_NAME}.x
 289
 290 LD_FLAG=n
 291 DATA_ALIGNMENT=${DATA_ALIGNMENT_n}
 292 ( echo "/* Script for -n: mix text and data on same page */"
 293   . ${CUSTOMIZER_SCRIPT} ${EMULATION_NAME}
 294   . ${srcdir}/scripttempl/${SCRIPT_NAME}.sc
 295 ) | sed -e '/^ *$/d;s/[         ]*$//' > ldscripts/${EMULATION_NAME}.xn
 296
 297 LD_FLAG=N
 298 DATA_ALIGNMENT=${DATA_ALIGNMENT_N}
 299 ( echo "/* Script for -N: mix text and data on same page; don't align data */"
 300   . ${CUSTOMIZER_SCRIPT} ${EMULATION_NAME}
 301   . ${srcdir}/scripttempl/${SCRIPT_NAME}.sc
 302 ) | sed -e '/^ *$/d;s/[         ]*$//' > ldscripts/${EMULATION_NAME}.xbn
 303
 304 if test -n "$GENERATE_COMBRELOC_SCRIPT"; then
 305   DATA_ALIGNMENT=${DATA_ALIGNMENT_c-${DATA_ALIGNMENT_}}
 306   LD_FLAG=c
 307   COMBRELOC=ldscripts/${EMULATION_NAME}.xc.tmp
 308   ( echo "/* Script for -z combreloc: combine and sort reloc sections */"
 309     . ${CUSTOMIZER_SCRIPT} ${EMULATION_NAME}
 310     . ${srcdir}/scripttempl/${SCRIPT_NAME}.sc
 311   ) | sed -e '/^ *$/d;s/[       ]*$//' > ldscripts/${EMULATION_NAME}.xc
 312   rm -f ${COMBRELOC}
 313   LD_FLAG=w
 314   RELRO_NOW=" "
 315   COMBRELOC=ldscripts/${EMULATION_NAME}.xw.tmp
 316   ( echo "/* Script for -z combreloc -z now -z relro: combine and sort reloc sections */"
 317     . ${CUSTOMIZER_SCRIPT} ${EMULATION_NAME}
 318     . ${srcdir}/scripttempl/${SCRIPT_NAME}.sc
 319   ) | sed -e '/^ *$/d;s/[       ]*$//' > ldscripts/${EMULATION_NAME}.xw
 320   rm -f ${COMBRELOC}
 321   COMBRELOC=
 322   unset RELRO_NOW
 323 fi
 324
 325 if test -n "$GENERATE_SHLIB_SCRIPT"; then
 326   LD_FLAG=shared
 327   DATA_ALIGNMENT=${DATA_ALIGNMENT_s-${DATA_ALIGNMENT_}}
 328   CREATE_SHLIB=" "
 329   (
 330     echo "/* Script for ld --shared: link shared library */"
 331     . ${CUSTOMIZER_SCRIPT} ${EMULATION_NAME}
 332     . ${srcdir}/scripttempl/${SCRIPT_NAME}.sc
 333   ) | sed -e '/^ *$/d;s/[       ]*$//' > ldscripts/${EMULATION_NAME}.xs
 334   if test -n "$GENERATE_COMBRELOC_SCRIPT"; then
 335     LD_FLAG=cshared
 336     DATA_ALIGNMENT=${DATA_ALIGNMENT_sc-${DATA_ALIGNMENT}}
 337     COMBRELOC=ldscripts/${EMULATION_NAME}.xsc.tmp
 338     ( echo "/* Script for --shared -z combreloc: shared library, combine & sort relocs */"
 339       . ${CUSTOMIZER_SCRIPT} ${EMULATION_NAME}
 340       . ${srcdir}/scripttempl/${SCRIPT_NAME}.sc
 341     ) | sed -e '/^ *$/d;s/[     ]*$//' > ldscripts/${EMULATION_NAME}.xsc
 342     rm -f ${COMBRELOC}
 343     LD_FLAG=wshared
 344     RELRO_NOW=" "
 345     COMBRELOC=ldscripts/${EMULATION_NAME}.xsw.tmp
 346     ( echo "/* Script for --shared -z combreloc -z now -z relro: shared library, combine & sort relocs */"
 347       . ${CUSTOMIZER_SCRIPT} ${EMULATION_NAME}
 348       . ${srcdir}/scripttempl/${SCRIPT_NAME}.sc
 349     ) | sed -e '/^ *$/d;s/[     ]*$//' > ldscripts/${EMULATION_NAME}.xsw
 350     rm -f ${COMBRELOC}
 351     COMBRELOC=
 352     unset RELRO_NOW
 353   fi
 354   unset CREATE_SHLIB
 355 fi
 356
 357 if test -n "$GENERATE_PIE_SCRIPT"; then
 358   LD_FLAG=pie
 359   DATA_ALIGNMENT=${DATA_ALIGNMENT_s-${DATA_ALIGNMENT_}}
 360   CREATE_PIE=" "
 361   (
 362     echo "/* Script for ld -pie: link position independent executable */"
 363     . ${CUSTOMIZER_SCRIPT} ${EMULATION_NAME}
 364     . ${srcdir}/scripttempl/${SCRIPT_NAME}.sc
 365   ) | sed -e '/^ *$/d;s/[       ]*$//' > ldscripts/${EMULATION_NAME}.xd
 366   if test -n "$GENERATE_COMBRELOC_SCRIPT"; then
 367     LD_FLAG=cpie
 368     DATA_ALIGNMENT=${DATA_ALIGNMENT_sc-${DATA_ALIGNMENT}}
 369     COMBRELOC=ldscripts/${EMULATION_NAME}.xdc.tmp
 370     ( echo "/* Script for -pie -z combreloc: position independent executable, combine & sort relocs */"
 371       . ${CUSTOMIZER_SCRIPT} ${EMULATION_NAME}
 372       . ${srcdir}/scripttempl/${SCRIPT_NAME}.sc
 373     ) | sed -e '/^ *$/d;s/[     ]*$//' > ldscripts/${EMULATION_NAME}.xdc
 374     rm -f ${COMBRELOC}
 375     LD_FLAG=wpie
 376     RELRO_NOW=" "
 377     COMBRELOC=ldscripts/${EMULATION_NAME}.xdw.tmp
 378     ( echo "/* Script for -pie -z combreloc -z now -z relro: position independent executable, combine & sort relocs */"
 379       . ${CUSTOMIZER_SCRIPT} ${EMULATION_NAME}
 380       . ${srcdir}/scripttempl/${SCRIPT_NAME}.sc
 381     ) | sed -e '/^ *$/d;s/[     ]*$//' > ldscripts/${EMULATION_NAME}.xdw
 382     rm -f ${COMBRELOC}
 383     COMBRELOC=
 384     unset RELRO_NOW
 385   fi
 386   unset CREATE_PIE
 387 fi
 388
 389 case " $EMULATION_LIBPATH " in
 390     *" ${EMULATION_NAME} "*) COMPILE_IN=true;;
 391 esac
 392
 393 if test -n "${BASH+set}"; then
 394   source_em()
 395   {
 396     local current_script="$em_script"
 397     em_script=$1
 398     . $em_script
 399     em_script=$current_script
 400   }
 401   fragment()
 402   {
 403     local lineno=$[${BASH_LINENO[0]} + 1]
 404     echo >> e${EMULATION_NAME}.c "#line $lineno \"$em_script\""
 405     cat >> e${EMULATION_NAME}.c
 406   }
 407 else
 408   source_em()
 409   {
 410     . $1
 411   }
 412   fragment()
 413   {
 414     cat >> e${EMULATION_NAME}.c
 415   }
 416 fi
 417
 418 # Generate e${EMULATION_NAME}.c.
 419 # Start with an empty file, then the sourced .em script
 420 # can use the "fragment" function to append.
 421 > e${EMULATION_NAME}.c
 422 source_em ${srcdir}/emultempl/${TEMPLATE_NAME-generic}.em