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