#!/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"
TOOLDIR="`dirname $0`"      # let gcc find the tools for us
LDSCRIPTPATH="${TOOLDIR}/../@target_alias@/lib"		# and the scripts
SHARED_ID=""
NEWLDSCRIPT=""

# check TOOLDIR from prefix/bin/ or prefix/target-alias/bin/
[ -d "${TOOLDIR}/../@target_alias@/lib" ] || LDSCRIPTPATH="${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
			 
		-shared-lib-id)
		          shift; SHARED_ID="$1";;      # Shared library ID

		-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)       ARG1="$ARG1 $1"
				  VERBOSE="y"
				  ;;

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

	if [ "$FINAL" = "yes" ]
	then
		[ "$VERBOSE" = "y" ] && set -x
		ARG1="$ARG1 $FINAL_ONLY"
		NEWLDSCRIPT=`mktemp /tmp/flt-XXXXXX`
		SEDOP=" -e s/^R_RODAT// -e /^W_RODAT/d"
		if [ "$MOVDAT" ]
		then
			$LINKER -r -d -o "$OFILE.elf2flt" $ARG1  || exit $?
			if [ "`@target_alias@-objdump -h "$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.\\)(_start)/\1(lib_main)/"
			fi

			# Provide the magic parameter that defines the library data segment pointer offset
			case "@target_cpu@" in
			    h8300) GOT_OFFSET="__current_shared_library_er5_offset_";;
			    *)     GOT_OFFSET="_current_shared_library_a5_offset_";;
			esac
			ARG1="$ARG1 -defsym $GOT_OFFSET=`expr ${SHARED_ID} '*' -4 - 4`"
		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 [ "@got_check@" = "no" ]
		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
		if grep _GLOBAL_OFFSET_TABLE_ "$OFILE.gdb" > /dev/null 
		then
			$ELF2FLT $FLTFLAGS -o "$OFILE" -p "$OFILE.gdb" "$OFILE.elf" || exit $?
		else
			$ELF2FLT $FLTFLAGS -o "$OFILE" -r "$OFILE.elf" || exit $?
		fi
		rm -f "$OFILE.elf"  # not needed for any reason
		rm -f "$NEWLDSCRIPT"
		exit 0
	fi

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

#
# otherwise pretend we aren't here
#

exec $LINKER "$@"