MIPS: support mips*64 as CPU and gnuabi64 as ABI

For MIPS64r6 ports, Debian as an example, `mipsisa64r6el` is
used as the cpu name in triple.
Let's recognize them by `mips*64*(el)`.

For 64bit Ports, like Debian's mips64el and mips64r6el ports,
`gnuabi64` is used as the abi section.
Let's use N64 abi by default for the triple with gnuabi64.

bfd/config.bfd

@@ -941,11 +941,21 @@ case "${targ}" in
     targ_defvec=mips_elf32_be_vec
     targ_selvecs="mips_elf32_le_vec mips_elf64_be_vec mips_elf64_le_vec mips_ecoff_be_vec mips_ecoff_le_vec"
     ;;
-  mips64*el-*-linux*)
+  mips*64*el-*-linux*-gnuabi64)
+    targ_defvec=mips_elf64_trad_le_vec
+    targ_selvecs="mips_elf32_ntrad_be_vec mips_elf32_ntrad_le_vec mips_elf32_trad_be_vec mips_elf32_trad_le_vec mips_elf64_trad_be_vec"
+    want64=true
+    ;;
+  mips*64*-*-linux*-gnuabi64)
+    targ_defvec=mips_elf64_trad_be_vec
+    targ_selvecs="mips_elf32_ntrad_be_vec mips_elf32_ntrad_le_vec mips_elf32_trad_be_vec mips_elf32_trad_le_vec mips_elf64_trad_le_vec"
+    want64=true
+    ;;
+  mips*64*el-*-linux*)
     targ_defvec=mips_elf32_ntrad_le_vec
     targ_selvecs="mips_elf32_ntrad_be_vec mips_elf32_trad_le_vec mips_elf32_trad_be_vec mips_elf64_trad_le_vec mips_elf64_trad_be_vec"
     ;;
-  mips64*-*-linux*)
+  mips*64*-*-linux*)
     targ_defvec=mips_elf32_ntrad_be_vec
     targ_selvecs="mips_elf32_ntrad_le_vec mips_elf32_trad_be_vec mips_elf32_trad_le_vec mips_elf64_trad_be_vec mips_elf64_trad_le_vec"
     ;;

binutils/testsuite/binutils-all/mips/mips-note-2-n32.d

@@ -1,4 +1,5 @@
 #PROG: objcopy
+#as: -n32
 #readelf: --notes --wide
 #objcopy: --merge-notes
 #name: MIPS merge notes section (n32)

gas/configure

@@ -12223,7 +12223,10 @@ _ACEOF
 	esac
 	# Decide which ABI to target by default.
 	case ${target} in
-	  mips64*-linux* | mips-sgi-irix6* | mips64*-freebsd* \
+	  mips*64*-linux-gnuabi64)
+	    mips_default_abi=N64_ABI
+	    ;;
+	  mips*64*-linux* | mips-sgi-irix6* | mips64*-freebsd* \
 	  | mips64*-kfreebsd*-gnu | mips64*-ps2-elf*)
 	    mips_default_abi=N32_ABI
 	    ;;

gas/configure.ac

@@ -392,7 +392,10 @@ changequote([,])dnl
 	esac
 	# Decide which ABI to target by default.
 	case ${target} in
-	  mips64*-linux* | mips-sgi-irix6* | mips64*-freebsd* \
+	  mips*64*-linux-gnuabi64)
+	    mips_default_abi=N64_ABI
+	    ;;
+	  mips*64*-linux* | mips-sgi-irix6* | mips64*-freebsd* \
 	  | mips64*-kfreebsd*-gnu | mips64*-ps2-elf*)
 	    mips_default_abi=N32_ABI
 	    ;;

gold/configure.tgt

@@ -153,6 +153,13 @@ aarch64*-*)
  targ_big_endian=false
  targ_extra_big_endian=true
  ;;
+mips*64*el*-*-*|mips*64*le*-*-*)
+ targ_obj=mips
+ targ_machine=EM_MIPS_RS3_LE
+ targ_size=64
+ targ_big_endian=false
+ targ_extra_big_endian=true
+ ;;
 mips*el*-*-*|mips*le*-*-*)
  targ_obj=mips
  targ_machine=EM_MIPS_RS3_LE
@@ -160,6 +167,13 @@ mips*el*-*-*|mips*le*-*-*)
  targ_big_endian=false
  targ_extra_big_endian=true
  ;;
+mips*64*-*-*)
+ targ_obj=mips
+ targ_machine=EM_MIPS
+ targ_size=64
+ targ_big_endian=true
+ targ_extra_big_endian=false
+ ;;
 mips*-*-*)
  targ_obj=mips
  targ_machine=EM_MIPS

ld/configure.tgt

@@ -580,11 +580,19 @@ mips*-*-vxworks*)	targ_emul=elf32ebmipvxworks
 			;;
 mips*-*-windiss)	targ_emul=elf32mipswindiss
 			;;
-mips64*el-*-linux-*)	targ_emul=elf32ltsmipn32
+mips*64*el-*-linux-gnuabi64)	targ_emul=elf64ltsmip
+			targ_extra_emuls="elf32btsmipn32 elf32ltsmipn32 elf32ltsmip elf32btsmip elf64btsmip"
+			targ_extra_libpath=$targ_extra_emuls
+			;;
+mips*64*el-*-linux-*)	targ_emul=elf32ltsmipn32
 			targ_extra_emuls="elf32btsmipn32 elf32ltsmip elf32btsmip elf64ltsmip elf64btsmip"
 			targ_extra_libpath=$targ_extra_emuls
 			;;
-mips64*-*-linux-*)	targ_emul=elf32btsmipn32
+mips*64*-*-linux-gnuabi64)	targ_emul=elf64btsmip
+			targ_extra_emuls="elf32btsmipn32 elf32ltsmipn32 elf32btsmip elf32ltsmip elf64ltsmip"
+			targ_extra_libpath=$targ_extra_emuls
+			;;
+mips*64*-*-linux-*)	targ_emul=elf32btsmipn32
 			targ_extra_emuls="elf32ltsmipn32 elf32btsmip elf32ltsmip elf64btsmip elf64ltsmip"
 			targ_extra_libpath=$targ_extra_emuls
 			;;