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
  26 # check TOOLDIR from prefix/bin/ or prefix/target-alias/bin/
  27 [ -d "${LDSCRIPTPATH}" ] || LDSCRIPTPATH="${TOOLDIR}/../lib"
  28
  29 #
  30 # if we have the elf2flt options, run it
  31 #
  32
  33 if expr "$*" : ".*-elf2flt.*" > /dev/null
  34 then
  35         ARG1=
  36         ARG2=
  37         OFILE="a.out"
  38         PIC=
  39         SDIRS=
  40         LDSCRIPT=
  41         FINAL="yes"
  42         FINAL_ONLY=
  43         MOVDAT=
  44         VERBOSE=
  45
  46         while [ $# -ne 0 ]
  47         do
  48                 case "$1" in
  49
  50                 -elf2flt) ;;                           # we already know this
  51                 -elf2flt*)FLTFLAGS="`expr \"$1\" : '-elf2flt=\(.*\)'` $FLTFLAGS";;
  52
  53                 -move-rodata)
  54                           MOVDAT="y";;                 # Put rodata in ROM if possible
  55
  56                 -shared-lib-id)
  57                           shift; SHARED_ID="$1";;      # Shared library ID
  58
  59                 -o)       shift; OFILE="$1";;          # the final outfile
  60                 -o*)      OFILE="`expr \"$1\" : '-o\(.*\)'`";;
  61
  62                 -T)       shift; LDSCRIPT="$1";;       # they have a linker script
  63                 -c)       shift; LDSCRIPT="$1";;
  64
  65                 -L)       ARG1="$ARG1 $1"              # remember search dirs
  66                           shift;
  67                                   ARG1="$ARG1 $1"
  68                                   SDIRS="$SDIRS -L$1"
  69                                   ;;
  70                 -L*)      ARG1="$ARG1 $1"; SDIRS="$SDIRS $1";;
  71
  72                 -EB)      ARG1="$ARG1 $1"; SDIRS="$SDIRS $1";; # arm big endian
  73
  74                 -relax)   ;;                           # eat this for microblaze
  75
  76                 -r|-Ur)   FINAL=""                     # this is not a final link
  77                           ARG1="$ARG1 $1"
  78                                   ;;
  79
  80                 -v)       ARG1="$ARG1 $1"
  81                                   VERBOSE="y"
  82                                   ;;
  83
  84                 -m)       shift; EMUL="-m $1";;        # ld emulations for h8300
  85                 -m*)      EMUL=$1;;
  86
  87                 *)        ARG1="$ARG1 $1"
  88                                   ;;
  89                 esac
  90                 shift
  91         done
  92
  93         if [ "$FINAL" = "yes" ]
  94         then
  95                 [ "$VERBOSE" = "y" ] && set -x
  96                 ARG1="$ARG1 $FINAL_ONLY"
  97                 NEWLDSCRIPT=`mktemp /tmp/flt-XXXXXX`
  98                 SEDOP=" -e s/^R_RODAT// -e /^W_RODAT/d"
  99                 OBJCOPYOP=""
 100                 if [ "$MOVDAT" ]
 101                 then
 102                         $LINKER -r -d -o "$OFILE.elf2flt" $ARG1  || exit $?
 103                         if [ "`$OBJDUMP -h "$OFILE.elf2flt" | \
 104                                         egrep -A1 '[.]rodata' | grep RELOC`" ]
 105                         then
 106                                 echo "warning: .rodata section contains relocations"
 107                         else
 108                                 SEDOP="-e /^R_RODAT/d -e s/^W_RODAT//"
 109                         fi
 110                 fi
 111                 if [ "$SHARED_ID" ]
 112                 then
 113                         # Massage the linker script into something useful.  These
 114                         # regexps are ugly due to some bizzare shell quoting rules.
 115                         #    SEDOP="$SEDOP -e \"s/ORIGIN = 0x0,/ORIGIN = 0x${SHARED_ID}000000,/\""
 116                         #    SEDOP="$SEDOP -e \"s/.text 0x0 :/.text 0x${SHARED_ID}000000 :/\""
 117                         SEDOP="$SEDOP -e s/\\(ORIGIN.=.0\\)x0,/\\1x${SHARED_ID}000000,/"
 118                         SEDOP="$SEDOP -e s/\\([.]text.0\\)x0[^0-9]:/\\1x${SHARED_ID}000000:/"
 119
 120                         if [ "$SHARED_ID" -gt 0 ]
 121                         then
 122                                 # Non application modules enter via main not _start
 123                                 #    SEDOP="$SEDOP -e 's/ENTRY (_start)/ENTRY (main)/'"
 124                                 SEDOP="$SEDOP -e s/\\(ENTRY.\\)(_start)/\1(lib_main)/"
 125                                 OBJCOPYOP="--localize-hidden --weaken"
 126                         fi
 127
 128                         # Provide the magic parameter that defines the library data segment pointer offset
 129                         case "@target_cpu@" in
 130                             h8300) GOT_OFFSET="__current_shared_library_er5_offset_";;
 131                             *)     GOT_OFFSET="_current_shared_library_a5_offset_";;
 132                         esac
 133                         ARG1="$ARG1 -defsym $GOT_OFFSET=`expr ${SHARED_ID} '*' -4 - 4`"
 134                 fi
 135                 if [ "@emit_relocs@" = "yes" ]
 136                 then
 137                         SEDOP="$SEDOP -e s/^SINGLE_LINK://"
 138                 else
 139                         SEDOP="$SEDOP -e /^SINGLE_LINK:/d"
 140                 fi
 141
 142                 # provide a default linker script, we usually need one
 143                 [ -z "$LDSCRIPT" ] && LDSCRIPT="${LDSCRIPTPATH}/elf2flt.ld"
 144
 145                 # if we can find the linker script we preprocess it,  otherwise
 146                 # we assume the user knows what they are doing
 147                 if [ -f "$LDSCRIPT" ]; then
 148                         sed $SEDOP < "$LDSCRIPT" > "$NEWLDSCRIPT"
 149                         LDSCRIPT="$NEWLDSCRIPT"
 150                 elif [ -f "${LDSCRIPTPATH}/$LDSCRIPT" ]; then
 151                         sed $SEDOP < "${LDSCRIPTPATH}/$LDSCRIPT" > "$NEWLDSCRIPT"
 152                         LDSCRIPT="$NEWLDSCRIPT"
 153                 elif [ -f "${LDSCRIPTPATH}/ldscripts/$LDSCRIPT" ]; then
 154                         sed $SEDOP < "${LDSCRIPTPATH}/ldscripts/$LDSCRIPT" > "$NEWLDSCRIPT"
 155                         LDSCRIPT="$NEWLDSCRIPT"
 156                 fi
 157
 158                 if [ "@emit_relocs@" = "yes" ]
 159                 then
 160                  $LINKER $EMUL $SDIRS -T $LDSCRIPT -q -o "$OFILE.gdb" $ARG1             ||exit $?
 161                  RFILE="$OFILE.gdb"
 162                  FLTFLAGS="$FLTFLAGS -a"
 163                 else
 164                  if [ "@got_check@" = "no" ]
 165                  then
 166                   $LINKER $EMUL $SDIRS -T $LDSCRIPT -Ur -d -o "$OFILE.elf" $ARG1         ||exit $?
 167                   $LINKER $EMUL $SDIRS -T $LDSCRIPT -o "$OFILE.gdb" $ARG1                ||exit $?
 168                  else
 169                   $LINKER $EMUL -r -d -o "$OFILE.elf2flt" $ARG1                          ||exit $?
 170                   $LINKER $EMUL $SDIRS -T $LDSCRIPT -Ur -o "$OFILE.elf" "$OFILE.elf2flt" ||exit $?
 171                   $LINKER $EMUL $SDIRS -T $LDSCRIPT -o "$OFILE.gdb" "$OFILE.elf2flt"     ||exit $?
 172                   rm -f "$OFILE.elf2flt"
 173                  fi
 174                  RFILE="$OFILE.elf"
 175                 fi
 176                 if $NM "$OFILE.gdb" | grep _GLOBAL_OFFSET_TABLE_ > /dev/null
 177                 then
 178                         $ELF2FLT $FLTFLAGS -o "$OFILE" -p "$OFILE.gdb" "$RFILE" || exit $?
 179                 else
 180                         $ELF2FLT $FLTFLAGS -o "$OFILE" -r "$RFILE" || exit $?
 181                 fi
 182                 if [ "$OBJCOPYOP" ]
 183                 then
 184                  if $OBJCOPY $OBJCOPYOP --help > /dev/null 2>&1
 185                  then
 186                   $OBJCOPY $OBJCOPYOP "$OFILE.gdb" ||exit $?
 187                  else
 188                   case " $OBJCOPYOP " in
 189                   *" --localize-hidden "*)
 190                     SYMS=`mktemp /tmp/flt-XXXXXX`
 191                     $OBJDUMP --syms "$OFILE.gdb" > "$SYMS" ||exit $?
 192                     sed -n 's/.*\(\.hidden\|\.internal\) \(.*\)/-L \2/p' < "$SYMS" > "$SYMS.hidden" ||exit $?
 193                     if [ -s "$SYMS.hidden" ]
 194                     then
 195                      xargs ${VERBOSE:+-t} $OBJCOPY "$OFILE.gdb" < "$SYMS.hidden" ||exit $?
 196                     fi
 197                     rm -f "$SYMS" "$SYMS.hidden"
 198                     ;;
 199                   esac
 200                   case " $OBJCOPYOP " in
 201                   *" --weaken "*)
 202                     $OBJCOPY --weaken "$OFILE.gdb" ||exit $?
 203                     ;;
 204                   esac
 205                  fi
 206                 fi
 207                 [ "$RFILE" = "$OFILE.gdb" ] || rm -f "$RFILE"  # not needed for any reason
 208                 rm -f "$NEWLDSCRIPT"
 209                 exit 0
 210         fi
 211
 212         exec $LINKER -o "$OFILE" $ARG1
 213 fi
 214
 215 #
 216 # otherwise pretend we aren't here
 217 #
 218
 219 exec $LINKER "$@"