Change the load address from offset 0 in region 1 to offset 4G in region 0.

This (almost) gives us the address space back (at the bottom) that we lost
at the top.

Region 0 has traditionally been reserved for IA-32 emulation, which has not
been of great interest. By starting 64-bit processes at the 4G boundary we
at least preserve some of the advantages:
1.  Any invalid pointer cast (from int to pointer and back) will still
    always fail and not only when more than 4GB of memory is in use.
2.  Memory sharing between 64-bit and 32-bit processes is still possibly
    by using addresses < 4G.

gnu/usr.bin/binutils/ld/Makefile.ia64

@@ -4,12 +4,13 @@ NATIVE_EMULATION= elf64_ia64_fbsd
 
 SRCS+=		e${NATIVE_EMULATION}.c
 CLEANFILES+=	e${NATIVE_EMULATION}.c
-e${NATIVE_EMULATION}.c: emulparams/${NATIVE_EMULATION}.sh emultempl/elf32.em \
+e${NATIVE_EMULATION}.c: ${.CURDIR}/${NATIVE_EMULATION}.sh emultempl/elf32.em \
     scripttempl/elf.sc genscripts.sh stringify.sed
 	sh ${.CURDIR}/genscripts.sh ${SRCDIR}/ld ${LIBSEARCHPATH} \
 	    ${TOOLS_PREFIX}/usr \
 	    ${HOST} ${TARGET_TUPLE} ${TARGET_TUPLE} \
-	    ${NATIVE_EMULATION} "" no ${NATIVE_EMULATION} ${TARGET_TUPLE}
+	    ${NATIVE_EMULATION} "" no ${NATIVE_EMULATION} ${TARGET_TUPLE} \
+	    ${.CURDIR}/${NATIVE_EMULATION}.sh
 
 #XXX	EMS+=	eelf64_ia64
 

gnu/usr.bin/binutils/ld/elf64_ia64_fbsd.sh

@@ -1,5 +1,6 @@
+# $FreeBSD$
 . ${srcdir}/emulparams/elf64_ia64.sh
-TEXT_START_ADDR="0x2000000000000000"
+TEXT_START_ADDR="0x0000000100000000"
 unset DATA_ADDR
 unset SMALL_DATA_CTOR
 unset SMALL_DATA_DTOR