ld-elf2flt.in

#!/bin/sh
#
# allow us to do flat processing if the flag -Wl,-elf2flt or -elf2flt to
# the 'C' compiler or linker respectively
#
# uses the env. var FLTFLAGS as extra parameters to pass to elf2flt
# arguments given like -Wl,-elf2flt="-b 10000 -v" are given before FLTFLAGS
#
# Copyright (C) 2002,2003 David McCullough <davidm@snapgear.com>
# Copyright (C) 2000, Lineo. davidm@lineo.com
#
# This is Free Software, under the GNU Public Licence v2 or greater.
#

LINKER="$0.real"            # the original renamed-linker
ELF2FLT="`expr $0 : '\(.*\)ld'`elf2flt"
NM="`expr $0 : '\(.*\)ld'`nm"
TOOLDIR="`dirname $0`"      # let gcc find the tools for us
OBJCOPY="`expr $0 : '\(.*\)ld'`objcopy"
[ -f "$OBJCOPY" ] || OBJCOPY="$TOOLDIR/../../bin/@target_alias@-objcopy"
OBJDUMP="`expr $OBJCOPY : '\(.*\)objcopy'`objdump"
LDSCRIPTPATH="@binutils_ldscript_dir@"	# and the scripts
SHARED_ID=""
NEWLDSCRIPT=""
WANT_SHARED=""

# check TOOLDIR from prefix/bin/ or prefix/target-alias/bin/
[ -d "${LDSCRIPTPATH}" ] || LDSCRIPTPATH="${TOOLDIR}/../lib"

#
# if we have the elf2flt options, run it
#

if expr "$*" : ".*-elf2flt.*" > /dev/null
then
	ARG1=
	ARG2=
	OFILE="a.out"
	PIC=
	SDIRS=
	LDSCRIPT=
	FINAL="yes"
	FINAL_ONLY=
	MOVDAT=
	VERBOSE=

	while [ $# -ne 0 ]
	do
		case "$1" in

		-elf2flt) ;;                           # we already know this
		-elf2flt*)FLTFLAGS="`expr \"$1\" : '-elf2flt=\(.*\)'` $FLTFLAGS";; 

		-move-rodata)
		          MOVDAT="y";;                 # Put rodata in ROM if possible
		-s|-S|--strip-all|--strip-debug)
		          ;;                           # Ignore strip flags

		-shared-lib-id)
		          shift; SHARED_ID="$1";;      # Shared library ID
		-shared|-G)
		          WANT_SHARED="y";;            # Shared library

		-o)       shift; OFILE="$1";;          # the final outfile
		-o*)      OFILE="`expr \"$1\" : '-o\(.*\)'`";;

		-T)       shift; LDSCRIPT="$1";;       # they have a linker script
		-c)       shift; LDSCRIPT="$1";;

		-L)       ARG1="$ARG1 $1"              # remember search dirs
		          shift;
				  ARG1="$ARG1 $1"
				  SDIRS="$SDIRS -L$1"
				  ;;
		-L*)      ARG1="$ARG1 $1"; SDIRS="$SDIRS $1";;

		-EB)      ARG1="$ARG1 $1"; SDIRS="$SDIRS $1";; # arm big endian

		-relax)   ;;                           # eat this for microblaze

		-r|-Ur)   FINAL=""                     # this is not a final link
		          ARG1="$ARG1 $1"
				  ;;

		-v|--verbose)
				  ARG1="$ARG1 $1"
				  VERBOSE="y"
				  ;;

		-m)       shift; EMUL="-m $1";;        # ld emulations for h8300
		-m*)      EMUL=$1;;
 
		*)        ARG1="$ARG1 $1"
				  ;;
		esac
		shift
	done

	if [ "$WANT_SHARED" = "y" ]
	then
		if [ -z "$SHARED_ID" ]
		then
			echo "-shared used without passing a shared library ID"
			exit 1
		fi
	fi
	if [ "$FINAL" = "yes" ]
	then
		[ "$VERBOSE" = "y" ] && set -x
		ARG1="$ARG1 $FINAL_ONLY"
		NEWLDSCRIPT=`mktemp /tmp/flt-XXXXXX`
		trap 'rm -f "$NEWLDSCRIPT"' EXIT
		SEDOP=" -e s/^R_RODAT// -e /^W_RODAT/d"
		OBJCOPYOP=""
		if [ "$MOVDAT" ]
		then
			$LINKER -r -d -o "$OFILE.elf2flt" $ARG1  || exit $?
			if [ "`$OBJDUMP -h "$OFILE.elf2flt" | \
					egrep -A1 '[.]rodata' | grep RELOC`" ]
			then
				echo "warning: .rodata section contains relocations"
			else
				SEDOP="-e /^R_RODAT/d -e s/^W_RODAT//"
			fi
		fi
		if [ "$SHARED_ID" ]
		then
			# Massage the linker script into something useful.  These
			# regexps are ugly due to some bizzare shell quoting rules.
			#    SEDOP="$SEDOP -e \"s/ORIGIN = 0x0,/ORIGIN = 0x${SHARED_ID}000000,/\""
			#    SEDOP="$SEDOP -e \"s/.text 0x0 :/.text 0x${SHARED_ID}000000 :/\""			
			SEDOP="$SEDOP -e s/\\(ORIGIN.=.0\\)x0,/\\1x${SHARED_ID}000000,/"
			SEDOP="$SEDOP -e s/\\([.]text.0\\)x0[^0-9]:/\\1x${SHARED_ID}000000:/"
			
			if [ "$SHARED_ID" -gt 0 ]
			then
				# Non application modules enter via main not _start
				#    SEDOP="$SEDOP -e 's/ENTRY (_start)/ENTRY (main)/'"
				SEDOP="$SEDOP -e s/\\(ENTRY.\\)(@SYMBOL_PREFIX@_start)/\1(lib_main)/"
				OBJCOPYOP="--localize-hidden --weaken"
			fi

			# Provide the magic parameter that defines the library data segment pointer offset
			GOT_ADJ=4
			case "@target_cpu@" in
			    bfin)  GOT_OFFSET="_current_shared_library_p5_offset_" GOT_ADJ=1;;
			    h8300) GOT_OFFSET="__current_shared_library_er5_offset_";;
			    *)     GOT_OFFSET="_current_shared_library_a5_offset_";;
			esac
			ARG1="$ARG1 -defsym $GOT_OFFSET=`expr ${SHARED_ID} '*' -${GOT_ADJ} - ${GOT_ADJ}`"
		fi
		if [ "@emit_relocs@" = "1" ]
		then
			SEDOP="$SEDOP -e s/^SINGLE_LINK://"
		else
			SEDOP="$SEDOP -e /^SINGLE_LINK:/d"
		fi
		if [ "@emit_ctor_dtor@" = "1" ]
		then
			SEDOP="$SEDOP -e s/^TOR://"
		else
			SEDOP="$SEDOP -e /^TOR:/d"
		fi
		
		# provide a default linker script, we usually need one
		[ -z "$LDSCRIPT" ] && LDSCRIPT="${LDSCRIPTPATH}/elf2flt.ld"

		# if we can find the linker script we preprocess it,  otherwise
		# we assume the user knows what they are doing
		if [ -f "$LDSCRIPT" ]; then
			sed $SEDOP < "$LDSCRIPT" > "$NEWLDSCRIPT"
			LDSCRIPT="$NEWLDSCRIPT"
		elif [ -f "${LDSCRIPTPATH}/$LDSCRIPT" ]; then
			sed $SEDOP < "${LDSCRIPTPATH}/$LDSCRIPT" > "$NEWLDSCRIPT"
			LDSCRIPT="$NEWLDSCRIPT"
		elif [ -f "${LDSCRIPTPATH}/ldscripts/$LDSCRIPT" ]; then
			sed $SEDOP < "${LDSCRIPTPATH}/ldscripts/$LDSCRIPT" > "$NEWLDSCRIPT"
			LDSCRIPT="$NEWLDSCRIPT"
		fi

		if [ "@emit_relocs@" = "1" ]
		then
		 $LINKER $EMUL $SDIRS -T $LDSCRIPT -q -o "$OFILE.gdb" $ARG1             ||exit $?
		 RFILE="$OFILE.gdb"
		 FLTFLAGS="$FLTFLAGS -a"
		else
		 if [ "@got_check@" = "0" ]
		 then
		  $LINKER $EMUL $SDIRS -T $LDSCRIPT -Ur -d -o "$OFILE.elf" $ARG1         ||exit $?
		  $LINKER $EMUL $SDIRS -T $LDSCRIPT -o "$OFILE.gdb" $ARG1                ||exit $?
		 else
		  $LINKER $EMUL -r -d -o "$OFILE.elf2flt" $ARG1                          ||exit $?
		  $LINKER $EMUL $SDIRS -T $LDSCRIPT -Ur -o "$OFILE.elf" "$OFILE.elf2flt" ||exit $?
		  $LINKER $EMUL $SDIRS -T $LDSCRIPT -o "$OFILE.gdb" "$OFILE.elf2flt"     ||exit $?
		  rm -f "$OFILE.elf2flt"
		 fi
		 RFILE="$OFILE.elf"
		fi
		if $NM "$OFILE.gdb" | grep _GLOBAL_OFFSET_TABLE_ > /dev/null 
		then
			$ELF2FLT $FLTFLAGS -o "$OFILE" -p "$OFILE.gdb" "$RFILE" || exit $?
		else
			$ELF2FLT $FLTFLAGS -o "$OFILE" -r "$RFILE" || exit $?
		fi
		if [ "$OBJCOPYOP" ]
		then
		 if $OBJCOPY $OBJCOPYOP --help > /dev/null 2>&1
		 then
		  $OBJCOPY $OBJCOPYOP "$OFILE.gdb" ||exit $?
		 else
		  case " $OBJCOPYOP " in
		  *" --localize-hidden "*)
		    SYMS=`mktemp /tmp/flt-XXXXXX`
		    $OBJDUMP --syms "$OFILE.gdb" > "$SYMS" ||exit $?
		    sed -n 's/.*\(\.hidden\|\.internal\) \(.*\)/-L \2/p' < "$SYMS" > "$SYMS.hidden" ||exit $?
		    if [ -s "$SYMS.hidden" ]
		    then
		     xargs ${VERBOSE:+-t} $OBJCOPY "$OFILE.gdb" < "$SYMS.hidden" ||exit $?
		    fi
		    rm -f "$SYMS" "$SYMS.hidden"
		    ;;
		  esac
		  case " $OBJCOPYOP " in
		  *" --weaken "*)
		    $OBJCOPY --weaken "$OFILE.gdb" ||exit $?
		    ;;
		  esac
		 fi
		fi
		[ "$RFILE" = "$OFILE.gdb" ] || rm -f "$RFILE"  # not needed for any reason
		exit 0
	fi

	exec $LINKER -o "$OFILE" $ARG1
fi

#
# otherwise pretend we aren't here
#

exec $LINKER "$@"