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                 -s)       ;;                           # Ignore -s (strip)
  56
  57                 -shared-lib-id)
  58                           shift; SHARED_ID="$1";;      # Shared library ID
  59
  60                 -o)       shift; OFILE="$1";;          # the final outfile
  61                 -o*)      OFILE="`expr \"$1\" : '-o\(.*\)'`";;
  62
  63                 -T)       shift; LDSCRIPT="$1";;       # they have a linker script
  64                 -c)       shift; LDSCRIPT="$1";;
  65
  66                 -L)       ARG1="$ARG1 $1"              # remember search dirs
  67                           shift;
  68                                   ARG1="$ARG1 $1"
  69                                   SDIRS="$SDIRS -L$1"
  70                                   ;;
  71                 -L*)      ARG1="$ARG1 $1"; SDIRS="$SDIRS $1";;
  72
  73                 -EB)      ARG1="$ARG1 $1"; SDIRS="$SDIRS $1";; # arm big endian
  74
  75                 -relax)   ;;                           # eat this for microblaze
  76
  77                 -r|-Ur)   FINAL=""                     # this is not a final link
  78                           ARG1="$ARG1 $1"
  79                                   ;;
  80
  81                 -v)       ARG1="$ARG1 $1"
  82                                   VERBOSE="y"
  83                                   ;;
  84
  85                 -m)       shift; EMUL="-m $1";;        # ld emulations for h8300
  86                 -m*)      EMUL=$1;;
  87
  88                 *)        ARG1="$ARG1 $1"
  89                                   ;;
  90                 esac
  91                 shift
  92         done
  93
  94         if [ "$FINAL" = "yes" ]
  95         then
  96                 [ "$VERBOSE" = "y" ] && set -x
  97                 ARG1="$ARG1 $FINAL_ONLY"
  98                 NEWLDSCRIPT=`mktemp /tmp/flt-XXXXXX`
  99                 SEDOP=" -e s/^R_RODAT// -e /^W_RODAT/d"
 100                 OBJCOPYOP=""
 101                 if [ "$MOVDAT" ]
 102                 then
 103                         $LINKER -r -d -o "$OFILE.elf2flt" $ARG1  || exit $?
 104                         if [ "`$OBJDUMP -h "$OFILE.elf2flt" | \
 105                                         egrep -A1 '[.]rodata' | grep RELOC`" ]
 106                         then
 107                                 echo "warning: .rodata section contains relocations"
 108                         else
 109                                 SEDOP="-e /^R_RODAT/d -e s/^W_RODAT//"
 110                         fi
 111                 fi
 112                 if [ "$SHARED_ID" ]
 113                 then
 114                         # Massage the linker script into something useful.  These
 115                         # regexps are ugly due to some bizzare shell quoting rules.
 116                         #    SEDOP="$SEDOP -e \"s/ORIGIN = 0x0,/ORIGIN = 0x${SHARED_ID}000000,/\""
 117                         #    SEDOP="$SEDOP -e \"s/.text 0x0 :/.text 0x${SHARED_ID}000000 :/\""
 118                         SEDOP="$SEDOP -e s/\\(ORIGIN.=.0\\)x0,/\\1x${SHARED_ID}000000,/"
 119                         SEDOP="$SEDOP -e s/\\([.]text.0\\)x0[^0-9]:/\\1x${SHARED_ID}000000:/"
 120
 121                         if [ "$SHARED_ID" -gt 0 ]
 122                         then
 123                                 # Non application modules enter via main not _start
 124                                 #    SEDOP="$SEDOP -e 's/ENTRY (_start)/ENTRY (main)/'"
 125                                 SEDOP="$SEDOP -e s/\\(ENTRY.\\)(@SYMBOL_PREFIX@_start)/\1(lib_main)/"
 126                                 OBJCOPYOP="--localize-hidden --weaken"
 127                         fi
 128
 129                         # Provide the magic parameter that defines the library data segment pointer offset
 130                         GOT_ADJ=4
 131                         case "@target_cpu@" in
 132                             bfin)  GOT_OFFSET="_current_shared_library_p5_offset_" GOT_ADJ=1;;
 133                             h8300) GOT_OFFSET="__current_shared_library_er5_offset_";;
 134                             *)     GOT_OFFSET="_current_shared_library_a5_offset_";;
 135                         esac
 136                         ARG1="$ARG1 -defsym $GOT_OFFSET=`expr ${SHARED_ID} '*' -${GOT_ADJ} - ${GOT_ADJ}`"
 137                 fi
 138                 if [ "@emit_relocs@" = "yes" ]
 139                 then
 140                         SEDOP="$SEDOP -e s/^SINGLE_LINK://"
 141                 else
 142                         SEDOP="$SEDOP -e /^SINGLE_LINK:/d"
 143                 fi
 144
 145                 # provide a default linker script, we usually need one
 146                 [ -z "$LDSCRIPT" ] && LDSCRIPT="${LDSCRIPTPATH}/elf2flt.ld"
 147
 148                 # if we can find the linker script we preprocess it,  otherwise
 149                 # we assume the user knows what they are doing
 150                 if [ -f "$LDSCRIPT" ]; then
 151                         sed $SEDOP < "$LDSCRIPT" > "$NEWLDSCRIPT"
 152                         LDSCRIPT="$NEWLDSCRIPT"
 153                 elif [ -f "${LDSCRIPTPATH}/$LDSCRIPT" ]; then
 154                         sed $SEDOP < "${LDSCRIPTPATH}/$LDSCRIPT" > "$NEWLDSCRIPT"
 155                         LDSCRIPT="$NEWLDSCRIPT"
 156                 elif [ -f "${LDSCRIPTPATH}/ldscripts/$LDSCRIPT" ]; then
 157                         sed $SEDOP < "${LDSCRIPTPATH}/ldscripts/$LDSCRIPT" > "$NEWLDSCRIPT"
 158                         LDSCRIPT="$NEWLDSCRIPT"
 159                 fi
 160
 161                 if [ "@emit_relocs@" = "yes" ]
 162                 then
 163                  $LINKER $EMUL $SDIRS -T $LDSCRIPT -q -o "$OFILE.gdb" $ARG1             ||exit $?
 164                  RFILE="$OFILE.gdb"
 165                  FLTFLAGS="$FLTFLAGS -a"
 166                 else
 167                  if [ "@got_check@" = "no" ]
 168                  then
 169                   $LINKER $EMUL $SDIRS -T $LDSCRIPT -Ur -d -o "$OFILE.elf" $ARG1         ||exit $?
 170                   $LINKER $EMUL $SDIRS -T $LDSCRIPT -o "$OFILE.gdb" $ARG1                ||exit $?
 171                  else
 172                   $LINKER $EMUL -r -d -o "$OFILE.elf2flt" $ARG1                          ||exit $?
 173                   $LINKER $EMUL $SDIRS -T $LDSCRIPT -Ur -o "$OFILE.elf" "$OFILE.elf2flt" ||exit $?
 174                   $LINKER $EMUL $SDIRS -T $LDSCRIPT -o "$OFILE.gdb" "$OFILE.elf2flt"     ||exit $?
 175                   rm -f "$OFILE.elf2flt"
 176                  fi
 177                  RFILE="$OFILE.elf"
 178                 fi
 179                 if $NM "$OFILE.gdb" | grep _GLOBAL_OFFSET_TABLE_ > /dev/null
 180                 then
 181                         $ELF2FLT $FLTFLAGS -o "$OFILE" -p "$OFILE.gdb" "$RFILE" || exit $?
 182                 else
 183                         $ELF2FLT $FLTFLAGS -o "$OFILE" -r "$RFILE" || exit $?
 184                 fi
 185                 if [ "$OBJCOPYOP" ]
 186                 then
 187                  if $OBJCOPY $OBJCOPYOP --help > /dev/null 2>&1
 188                  then
 189                   $OBJCOPY $OBJCOPYOP "$OFILE.gdb" ||exit $?
 190                  else
 191                   case " $OBJCOPYOP " in
 192                   *" --localize-hidden "*)
 193                     SYMS=`mktemp /tmp/flt-XXXXXX`
 194                     $OBJDUMP --syms "$OFILE.gdb" > "$SYMS" ||exit $?
 195                     sed -n 's/.*\(\.hidden\|\.internal\) \(.*\)/-L \2/p' < "$SYMS" > "$SYMS.hidden" ||exit $?
 196                     if [ -s "$SYMS.hidden" ]
 197                     then
 198                      xargs ${VERBOSE:+-t} $OBJCOPY "$OFILE.gdb" < "$SYMS.hidden" ||exit $?
 199                     fi
 200                     rm -f "$SYMS" "$SYMS.hidden"
 201                     ;;
 202                   esac
 203                   case " $OBJCOPYOP " in
 204                   *" --weaken "*)
 205                     $OBJCOPY --weaken "$OFILE.gdb" ||exit $?
 206                     ;;
 207                   esac
 208                  fi
 209                 fi
 210                 [ "$RFILE" = "$OFILE.gdb" ] || rm -f "$RFILE"  # not needed for any reason
 211                 rm -f "$NEWLDSCRIPT"
 212                 exit 0
 213         fi
 214
 215         exec $LINKER -o "$OFILE" $ARG1
 216 fi
 217
 218 #
 219 # otherwise pretend we aren't here
 220 #
 221
 222 exec $LINKER "$@"