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 $0`"      # let gcc find the tools for us
  19 LDSCRIPTPATH="@binutils_ldscript_dir@"  # and the scripts
  20 SHARED_ID=""
  21 NEWLDSCRIPT=""
  22
  23 # check TOOLDIR from prefix/bin/ or prefix/target-alias/bin/
  24 [ -d "${LDSCRIPTPATH}" ] || LDSCRIPTPATH="${TOOLDIR}/../lib"
  25
  26 #
  27 # if we have the elf2flt options, run it
  28 #
  29
  30 if expr "$*" : ".*-elf2flt.*" > /dev/null
  31 then
  32         ARG1=
  33         ARG2=
  34         OFILE="a.out"
  35         PIC=
  36         SDIRS=
  37         LDSCRIPT=
  38         FINAL="yes"
  39         FINAL_ONLY=
  40         MOVDAT=
  41         VERBOSE=
  42
  43         while [ $# -ne 0 ]
  44         do
  45                 case "$1" in
  46
  47                 -elf2flt) ;;                           # we already know this
  48                 -elf2flt*)FLTFLAGS="`expr \"$1\" : '-elf2flt=\(.*\)'` $FLTFLAGS";;
  49
  50                 -move-rodata)
  51                           MOVDAT="y";;                 # Put rodata in ROM if possible
  52
  53                 -shared-lib-id)
  54                           shift; SHARED_ID="$1";;      # Shared library ID
  55
  56                 -o)       shift; OFILE="$1";;          # the final outfile
  57                 -o*)      OFILE="`expr \"$1\" : '-o\(.*\)'`";;
  58
  59                 -T)       shift; LDSCRIPT="$1";;       # they have a linker script
  60                 -c)       shift; LDSCRIPT="$1";;
  61
  62                 -L)       ARG1="$ARG1 $1"              # remember search dirs
  63                           shift;
  64                                   ARG1="$ARG1 $1"
  65                                   SDIRS="$SDIRS -L$1"
  66                                   ;;
  67                 -L*)      ARG1="$ARG1 $1"; SDIRS="$SDIRS $1";;
  68
  69                 -EB)      ARG1="$ARG1 $1"; SDIRS="$SDIRS $1";; # arm big endian
  70
  71                 -relax)   ;;                           # eat this for microblaze
  72
  73                 -r|-Ur)   FINAL=""                     # this is not a final link
  74                           ARG1="$ARG1 $1"
  75                                   ;;
  76
  77                 -v)       ARG1="$ARG1 $1"
  78                                   VERBOSE="y"
  79                                   ;;
  80
  81                 -m)       shift; EMUL="-m $1";;        # ld emulations for h8300
  82                 -m*)      EMUL=$1;;
  83
  84                 *)        ARG1="$ARG1 $1"
  85                                   ;;
  86                 esac
  87                 shift
  88         done
  89
  90         if [ "$FINAL" = "yes" ]
  91         then
  92                 [ "$VERBOSE" = "y" ] && set -x
  93                 ARG1="$ARG1 $FINAL_ONLY"
  94                 NEWLDSCRIPT=`mktemp /tmp/flt-XXXXXX`
  95                 SEDOP=" -e s/^R_RODAT// -e /^W_RODAT/d"
  96                 if [ "$MOVDAT" ]
  97                 then
  98                         $LINKER -r -d -o "$OFILE.elf2flt" $ARG1  || exit $?
  99                         if [ "`@target_alias@-objdump -h "$OFILE.elf2flt" | \
 100                                         egrep -A1 '[.]rodata' | grep RELOC`" ]
 101                         then
 102                                 echo "warning: .rodata section contains relocations"
 103                         else
 104                                 SEDOP="-e /^R_RODAT/d -e s/^W_RODAT//"
 105                         fi
 106                 fi
 107                 if [ "$SHARED_ID" ]
 108                 then
 109                         # Massage the linker script into something useful.  These
 110                         # regexps are ugly due to some bizzare shell quoting rules.
 111                         #    SEDOP="$SEDOP -e \"s/ORIGIN = 0x0,/ORIGIN = 0x${SHARED_ID}000000,/\""
 112                         #    SEDOP="$SEDOP -e \"s/.text 0x0 :/.text 0x${SHARED_ID}000000 :/\""
 113                         SEDOP="$SEDOP -e s/\\(ORIGIN.=.0\\)x0,/\\1x${SHARED_ID}000000,/"
 114                         SEDOP="$SEDOP -e s/\\([.]text.0\\)x0[^0-9]:/\\1x${SHARED_ID}000000:/"
 115
 116                         if [ "$SHARED_ID" -gt 0 ]
 117                         then
 118                                 # Non application modules enter via main not _start
 119                                 #    SEDOP="$SEDOP -e 's/ENTRY (_start)/ENTRY (main)/'"
 120                                 SEDOP="$SEDOP -e s/\\(ENTRY.\\)(_start)/\1(lib_main)/"
 121                         fi
 122
 123                         # Provide the magic parameter that defines the library data segment pointer offset
 124                         case "@target_cpu@" in
 125                             h8300) GOT_OFFSET="__current_shared_library_er5_offset_";;
 126                             *)     GOT_OFFSET="_current_shared_library_a5_offset_";;
 127                         esac
 128                         ARG1="$ARG1 -defsym $GOT_OFFSET=`expr ${SHARED_ID} '*' -4 - 4`"
 129                 fi
 130
 131                 # provide a default linker script, we usually need one
 132                 [ -z "$LDSCRIPT" ] && LDSCRIPT="${LDSCRIPTPATH}/elf2flt.ld"
 133
 134                 # if we can find the linker script we preprocess it,  otherwise
 135                 # we assume the user knows what they are doing
 136                 if [ -f "$LDSCRIPT" ]; then
 137                         sed $SEDOP < "$LDSCRIPT" > "$NEWLDSCRIPT"
 138                         LDSCRIPT="$NEWLDSCRIPT"
 139                 elif [ -f "${LDSCRIPTPATH}/$LDSCRIPT" ]; then
 140                         sed $SEDOP < "${LDSCRIPTPATH}/$LDSCRIPT" > "$NEWLDSCRIPT"
 141                         LDSCRIPT="$NEWLDSCRIPT"
 142                 elif [ -f "${LDSCRIPTPATH}/ldscripts/$LDSCRIPT" ]; then
 143                         sed $SEDOP < "${LDSCRIPTPATH}/ldscripts/$LDSCRIPT" > "$NEWLDSCRIPT"
 144                         LDSCRIPT="$NEWLDSCRIPT"
 145                 fi
 146
 147                 if [ "@got_check@" = "no" ]
 148                 then
 149                  $LINKER $EMUL $SDIRS -T $LDSCRIPT -Ur -d -o "$OFILE.elf" $ARG1         ||exit $?
 150                  $LINKER $EMUL $SDIRS -T $LDSCRIPT -o "$OFILE.gdb" $ARG1                ||exit $?
 151                 else
 152                  $LINKER $EMUL -r -d -o "$OFILE.elf2flt" $ARG1                          ||exit $?
 153                  $LINKER $EMUL $SDIRS -T $LDSCRIPT -Ur -o "$OFILE.elf" "$OFILE.elf2flt" ||exit $?
 154                  $LINKER $EMUL $SDIRS -T $LDSCRIPT -o "$OFILE.gdb" "$OFILE.elf2flt"     ||exit $?
 155                  rm -f "$OFILE.elf2flt"
 156                 fi
 157                 if $NM "$OFILE.gdb" | grep _GLOBAL_OFFSET_TABLE_ > /dev/null
 158                 then
 159                         $ELF2FLT $FLTFLAGS -o "$OFILE" -p "$OFILE.gdb" "$OFILE.elf" || exit $?
 160                 else
 161                         $ELF2FLT $FLTFLAGS -o "$OFILE" -r "$OFILE.elf" || exit $?
 162                 fi
 163                 rm -f "$OFILE.elf"  # not needed for any reason
 164                 rm -f "$NEWLDSCRIPT"
 165                 exit 0
 166         fi
 167
 168         exec $LINKER -o "$OFILE" $ARG1
 169 fi
 170
 171 #
 172 # otherwise pretend we aren't here
 173 #
 174
 175 exec $LINKER "$@"