ld-elf2flt.in

   1 #!/bin/sh
   2 #
   3 # allow us to do flat processing if the flag -Wl,-elf2flt or -elf2flt to
   4 # the 'C' compiler or linker respectively
   5 #
   6 # uses the env. var FLTFLAGS as extra parameters to pass to elf2flt
   7 # arguments given like -Wl,-elf2flt="-b 10000 -v" are given before FLTFLAGS
   8 #
   9 # Copyright (C) 2002,2003 David McCullough <davidm@snapgear.com>
  10 # Copyright (C) 2000, Lineo. davidm@lineo.com
  11 #
  12 # This is Free Software, under the GNU Public Licence v2 or greater.
  13 #
  14
  15 LINKER="$0.real"            # the original renamed-linker
  16 ELF2FLT="`expr $0 : '\(.*\)ld'`elf2flt"
  17 NM="`expr $0 : '\(.*\)ld'`nm"
  18 TOOLDIR="`dirname $0`"      # let gcc find the tools for us
  19 OBJCOPY="`expr $0 : '\(.*\)ld'`objcopy"
  20 [ -f "$OBJCOPY" ] || OBJCOPY="$TOOLDIR/../../bin/@target_alias@-objcopy"
  21 OBJDUMP="`expr $OBJCOPY : '\(.*\)objcopy'`objdump"
  22 LDSCRIPTPATH="@binutils_ldscript_dir@"  # and the scripts
  23 SHARED_ID=""
  24 NEWLDSCRIPT=""
  25 WANT_SHARED=""
  26
  27 # check TOOLDIR from prefix/bin/ or prefix/target-alias/bin/
  28 [ -d "${LDSCRIPTPATH}" ] || LDSCRIPTPATH="${TOOLDIR}/../lib"
  29
  30 #
  31 # if we have the elf2flt options, run it
  32 #
  33
  34 if expr "$*" : ".*-elf2flt.*" > /dev/null
  35 then
  36         ARG1=
  37         ARG2=
  38         OFILE="a.out"
  39         PIC=
  40         SDIRS=
  41         LDSCRIPT=
  42         FINAL="yes"
  43         FINAL_ONLY=
  44         MOVDAT=
  45         VERBOSE=
  46
  47         while [ $# -ne 0 ]
  48         do
  49                 case "$1" in
  50
  51                 -elf2flt) ;;                           # we already know this
  52                 -elf2flt*)FLTFLAGS="`expr \"$1\" : '-elf2flt=\(.*\)'` $FLTFLAGS";;
  53
  54                 -move-rodata)
  55                           MOVDAT="y";;                 # Put rodata in ROM if possible
  56                 -s)       ;;                           # Ignore -s (strip)
  57
  58                 -shared-lib-id)
  59                           shift; SHARED_ID="$1";;      # Shared library ID
  60                 -shared|-G)
  61                           WANT_SHARED="y";;            # Shared library
  62
  63                 -o)       shift; OFILE="$1";;          # the final outfile
  64                 -o*)      OFILE="`expr \"$1\" : '-o\(.*\)'`";;
  65
  66                 -T)       shift; LDSCRIPT="$1";;       # they have a linker script
  67                 -c)       shift; LDSCRIPT="$1";;
  68
  69                 -L)       ARG1="$ARG1 $1"              # remember search dirs
  70                           shift;
  71                                   ARG1="$ARG1 $1"
  72                                   SDIRS="$SDIRS -L$1"
  73                                   ;;
  74                 -L*)      ARG1="$ARG1 $1"; SDIRS="$SDIRS $1";;
  75
  76                 -EB)      ARG1="$ARG1 $1"; SDIRS="$SDIRS $1";; # arm big endian
  77
  78                 -relax)   ;;                           # eat this for microblaze
  79
  80                 -r|-Ur)   FINAL=""                     # this is not a final link
  81                           ARG1="$ARG1 $1"
  82                                   ;;
  83
  84                 -v)       ARG1="$ARG1 $1"
  85                                   VERBOSE="y"
  86                                   ;;
  87
  88                 -m)       shift; EMUL="-m $1";;        # ld emulations for h8300
  89                 -m*)      EMUL=$1;;
  90
  91                 *)        ARG1="$ARG1 $1"
  92                                   ;;
  93                 esac
  94                 shift
  95         done
  96
  97         if [ "$WANT_SHARED" = "y" ]
  98         then
  99                 if [ -z "$SHARED_ID" ]
 100                 then
 101                         echo "-shared used without passing a shared library ID"
 102                         exit 1
 103                 fi
 104         fi
 105         if [ "$FINAL" = "yes" ]
 106         then
 107                 [ "$VERBOSE" = "y" ] && set -x
 108                 ARG1="$ARG1 $FINAL_ONLY"
 109                 NEWLDSCRIPT=`mktemp /tmp/flt-XXXXXX`
 110                 SEDOP=" -e s/^R_RODAT// -e /^W_RODAT/d"
 111                 OBJCOPYOP=""
 112                 if [ "$MOVDAT" ]
 113                 then
 114                         $LINKER -r -d -o "$OFILE.elf2flt" $ARG1  || exit $?
 115                         if [ "`$OBJDUMP -h "$OFILE.elf2flt" | \
 116                                         egrep -A1 '[.]rodata' | grep RELOC`" ]
 117                         then
 118                                 echo "warning: .rodata section contains relocations"
 119                         else
 120                                 SEDOP="-e /^R_RODAT/d -e s/^W_RODAT//"
 121                         fi
 122                 fi
 123                 if [ "$SHARED_ID" ]
 124                 then
 125                         # Massage the linker script into something useful.  These
 126                         # regexps are ugly due to some bizzare shell quoting rules.
 127                         #    SEDOP="$SEDOP -e \"s/ORIGIN = 0x0,/ORIGIN = 0x${SHARED_ID}000000,/\""
 128                         #    SEDOP="$SEDOP -e \"s/.text 0x0 :/.text 0x${SHARED_ID}000000 :/\""
 129                         SEDOP="$SEDOP -e s/\\(ORIGIN.=.0\\)x0,/\\1x${SHARED_ID}000000,/"
 130                         SEDOP="$SEDOP -e s/\\([.]text.0\\)x0[^0-9]:/\\1x${SHARED_ID}000000:/"
 131
 132                         if [ "$SHARED_ID" -gt 0 ]
 133                         then
 134                                 # Non application modules enter via main not _start
 135                                 #    SEDOP="$SEDOP -e 's/ENTRY (_start)/ENTRY (main)/'"
 136                                 SEDOP="$SEDOP -e s/\\(ENTRY.\\)(@SYMBOL_PREFIX@_start)/\1(lib_main)/"
 137                                 OBJCOPYOP="--localize-hidden --weaken"
 138                         fi
 139
 140                         # Provide the magic parameter that defines the library data segment pointer offset
 141                         GOT_ADJ=4
 142                         case "@target_cpu@" in
 143                             bfin)  GOT_OFFSET="_current_shared_library_p5_offset_" GOT_ADJ=1;;
 144                             h8300) GOT_OFFSET="__current_shared_library_er5_offset_";;
 145                             *)     GOT_OFFSET="_current_shared_library_a5_offset_";;
 146                         esac
 147                         ARG1="$ARG1 -defsym $GOT_OFFSET=`expr ${SHARED_ID} '*' -${GOT_ADJ} - ${GOT_ADJ}`"
 148                 fi
 149                 if [ "@emit_relocs@" = "yes" ]
 150                 then
 151                         SEDOP="$SEDOP -e s/^SINGLE_LINK://"
 152                 else
 153                         SEDOP="$SEDOP -e /^SINGLE_LINK:/d"
 154                 fi
 155                 if [ "@emit_ctor_dtor@" = "yes" ]
 156                 then
 157                         SEDOP="$SEDOP -e s/^TOR://"
 158                 else
 159                         SEDOP="$SEDOP -e /^TOR:/d"
 160                 fi
 161
 162                 # provide a default linker script, we usually need one
 163                 [ -z "$LDSCRIPT" ] && LDSCRIPT="${LDSCRIPTPATH}/elf2flt.ld"
 164
 165                 # if we can find the linker script we preprocess it,  otherwise
 166                 # we assume the user knows what they are doing
 167                 if [ -f "$LDSCRIPT" ]; then
 168                         sed $SEDOP < "$LDSCRIPT" > "$NEWLDSCRIPT"
 169                         LDSCRIPT="$NEWLDSCRIPT"
 170                 elif [ -f "${LDSCRIPTPATH}/$LDSCRIPT" ]; then
 171                         sed $SEDOP < "${LDSCRIPTPATH}/$LDSCRIPT" > "$NEWLDSCRIPT"
 172                         LDSCRIPT="$NEWLDSCRIPT"
 173                 elif [ -f "${LDSCRIPTPATH}/ldscripts/$LDSCRIPT" ]; then
 174                         sed $SEDOP < "${LDSCRIPTPATH}/ldscripts/$LDSCRIPT" > "$NEWLDSCRIPT"
 175                         LDSCRIPT="$NEWLDSCRIPT"
 176                 fi
 177
 178                 if [ "@emit_relocs@" = "yes" ]
 179                 then
 180                  $LINKER $EMUL $SDIRS -T $LDSCRIPT -q -o "$OFILE.gdb" $ARG1             ||exit $?
 181                  RFILE="$OFILE.gdb"
 182                  FLTFLAGS="$FLTFLAGS -a"
 183                 else
 184                  if [ "@got_check@" = "no" ]
 185                  then
 186                   $LINKER $EMUL $SDIRS -T $LDSCRIPT -Ur -d -o "$OFILE.elf" $ARG1         ||exit $?
 187                   $LINKER $EMUL $SDIRS -T $LDSCRIPT -o "$OFILE.gdb" $ARG1                ||exit $?
 188                  else
 189                   $LINKER $EMUL -r -d -o "$OFILE.elf2flt" $ARG1                          ||exit $?
 190                   $LINKER $EMUL $SDIRS -T $LDSCRIPT -Ur -o "$OFILE.elf" "$OFILE.elf2flt" ||exit $?
 191                   $LINKER $EMUL $SDIRS -T $LDSCRIPT -o "$OFILE.gdb" "$OFILE.elf2flt"     ||exit $?
 192                   rm -f "$OFILE.elf2flt"
 193                  fi
 194                  RFILE="$OFILE.elf"
 195                 fi
 196                 if $NM "$OFILE.gdb" | grep _GLOBAL_OFFSET_TABLE_ > /dev/null
 197                 then
 198                         $ELF2FLT $FLTFLAGS -o "$OFILE" -p "$OFILE.gdb" "$RFILE" || exit $?
 199                 else
 200                         $ELF2FLT $FLTFLAGS -o "$OFILE" -r "$RFILE" || exit $?
 201                 fi
 202                 if [ "$OBJCOPYOP" ]
 203                 then
 204                  if $OBJCOPY $OBJCOPYOP --help > /dev/null 2>&1
 205                  then
 206                   $OBJCOPY $OBJCOPYOP "$OFILE.gdb" ||exit $?
 207                  else
 208                   case " $OBJCOPYOP " in
 209                   *" --localize-hidden "*)
 210                     SYMS=`mktemp /tmp/flt-XXXXXX`
 211                     $OBJDUMP --syms "$OFILE.gdb" > "$SYMS" ||exit $?
 212                     sed -n 's/.*\(\.hidden\|\.internal\) \(.*\)/-L \2/p' < "$SYMS" > "$SYMS.hidden" ||exit $?
 213                     if [ -s "$SYMS.hidden" ]
 214                     then
 215                      xargs ${VERBOSE:+-t} $OBJCOPY "$OFILE.gdb" < "$SYMS.hidden" ||exit $?
 216                     fi
 217                     rm -f "$SYMS" "$SYMS.hidden"
 218                     ;;
 219                   esac
 220                   case " $OBJCOPYOP " in
 221                   *" --weaken "*)
 222                     $OBJCOPY --weaken "$OFILE.gdb" ||exit $?
 223                     ;;
 224                   esac
 225                  fi
 226                 fi
 227                 [ "$RFILE" = "$OFILE.gdb" ] || rm -f "$RFILE"  # not needed for any reason
 228                 rm -f "$NEWLDSCRIPT"
 229                 exit 0
 230         fi
 231
 232         exec $LINKER -o "$OFILE" $ARG1
 233 fi
 234
 235 #
 236 # otherwise pretend we aren't here
 237 #
 238
 239 exec $LINKER "$@"