MIPS: Support `-gnuabi64' target triplet suffix for 64-bit Linux targets

Make the n64 ABI the default for 64-bit Linux targets specified with
`-gnuabi64' suffix included in the target triplet, for configurations
such as the Debian mips64el and mips64r6el ports.  Adjust testsuite
configuration accordingly.

There are the following regressions with the new target triplet:

mips64-linux-gnuabi64  +FAIL: readelf -S bintest
mips64-linux-gnuabi64  +FAIL: MIPS reloc estimation 1
mips64el-linux-gnuabi64  +FAIL: readelf -S bintest
mips64el-linux-gnuabi64  +FAIL: MIPS reloc estimation 1

The `readelf' issue comes from a difference in section headers produced
that the `binutils/testsuite/binutils-all/readelf.s-64' pattern template
does not match.  While there has been a precedent it does not appear to
me that there is a clear advantage from adding more and more variations
to the template rather than forking the existing template into multiple
ones for a more exact match.  So this is best deferred to a separate
discussion.

The MIPS reloc estimation issue is an actual bug in `objdump', which
discards a number of trailing entries from output here for n64 composed
relocations:

DYNAMIC RELOCATION RECORDS
OFFSET           TYPE              VALUE
0000000000000000 R_MIPS_NONE       *ABS*
0000000000000000 R_MIPS_NONE       *ABS*

and consequently `ld/testsuite/ld-mips-elf/reloc-estimate-1.d' does not
match even though ELF output produced is correct according to `readelf':

Relocation section '.rel.dyn' at offset 0x10400 contains 2 entries:
  Offset          Info           Type           Sym. Value    Sym. Name
000000000000  000000000000 R_MIPS_NONE
                    Type2: R_MIPS_NONE
                    Type3: R_MIPS_NONE
000000010000  000300001203 R_MIPS_REL32      0000000000010010 foo@@V2
                    Type2: R_MIPS_64
                    Type3: R_MIPS_NONE

As a genuine bug this has to be handled separately.

Co-Authored by: Maciej W. Rozycki <macro@orcam.me.uk>

	bfd/
	* config.bfd: Add `mips64*el-*-linux*-gnuabi64' and
	`mips64*-*-linux*-gnuabi64' targets.

	binutils/
	* testsuite/binutils-all/mips/mips.exp: Handle `*-*-*-gnuabi64'
	targets.
	* testsuite/binutils-all/objcopy.exp: Handle
	`mips64*-*-*-gnuabi64' targets.
	* testsuite/binutils-all/remove-relocs-01.d: Likewise.
	* testsuite/binutils-all/remove-relocs-04.d: Likewise.
	* testsuite/binutils-all/remove-relocs-05.d: Likewise.
	* testsuite/binutils-all/remove-relocs-06.d: Likewise.

	gas/
	* configure.ac: Handle `mips64*-linux-gnuabi64' targets.
	* configure: Regenerate.
	* testsuite/gas/mips/compact-eh-eb-7.d: Handle
	`mips64*-*-*-gnuabi64' targets.
	* testsuite/gas/mips/compact-eh-el-7.d: Likewise.

	ld/
	* configure.tgt: Add `mips64*el-*-linux-gnuabi64' and
	`mips64*-*-linux-gnuabi64' targets.
	* testsuite/ld-undefined/undefined.exp: Handle
	`mips64*-*-*-gnuabi64' targets.
	* testsuite/ld-mips-elf/attr-gnu-4-10.d: Likewise.
	* testsuite/ld-mips-elf/compact-eh6.d: Likewise.
	* testsuite/ld-mips-elf/mips-elf.exp: Handle `*-*-*-gnuabi64'
	targets.

16 files changed, 68 insertions, 25 deletions

diff --git a/bfd/config.bfd b/bfd/config.bfd
index 54a30ef..3b39ff3 100644
--- a/bfd/config.bfd
+++ b/bfd/config.bfd
@@ -941,10 +941,20 @@ 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*-gnuabi64)
+    targ_defvec=mips_elf64_trad_le_vec
+    targ_selvecs="mips_elf64_trad_be_vec mips_elf32_ntrad_le_vec mips_elf32_ntrad_be_vec mips_elf32_trad_le_vec mips_elf32_trad_be_vec"
+    want64=true
+    ;;
   mips64*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*-gnuabi64)
+    targ_defvec=mips_elf64_trad_be_vec
+    targ_selvecs="mips_elf64_trad_le_vec mips_elf32_ntrad_be_vec mips_elf32_ntrad_le_vec mips_elf32_trad_be_vec mips_elf32_trad_le_vec"
+    want64=true
+    ;;
   mips64*-*-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"
diff --git a/binutils/testsuite/binutils-all/mips/mips.exp b/binutils/testsuite/binutils-all/mips/mips.exp
index 91bf327..fdab971 100644
--- a/binutils/testsuite/binutils-all/mips/mips.exp
+++ b/binutils/testsuite/binutils-all/mips/mips.exp
@@ -125,13 +125,23 @@ if {[istarget *-*-openbsd*] } {
     if [istarget *el-*-*] {
 	set abi_asflags(o32) -32
 	set abi_ldflags(o32) -melf32ltsmip
-	set abi_asflags(n64) "-march=from-abi -64"
-	set abi_ldflags(n64) -melf64ltsmip
+	if [istarget *-*-*-gnuabi64] {
+	    set abi_asflags(n32) "-march=from-abi -n32"
+	    set abi_ldflags(n32) -melf32ltsmipn32
+	} else {
+	    set abi_asflags(n64) "-march=from-abi -64"
+	    set abi_ldflags(n64) -melf64ltsmip
+	}
     } else {
 	set abi_asflags(o32) -32
 	set abi_ldflags(o32) -melf32btsmip
-	set abi_asflags(n64) "-march=from-abi -64"
-	set abi_ldflags(n64) -melf64btsmip
+	if [istarget *-*-*-gnuabi64] {
+	    set abi_asflags(n32) "-march=from-abi -n32"
+	    set abi_ldflags(n32) -melf32btsmipn32
+	} else {
+	    set abi_asflags(n64) "-march=from-abi -64"
+	    set abi_ldflags(n64) -melf64btsmip
+	}
     }
     set irixemul 0
 } elseif {[istarget *-*-linux*] } {
diff --git a/binutils/testsuite/binutils-all/objcopy.exp b/binutils/testsuite/binutils-all/objcopy.exp
index 41add0f..1145835 100644
--- a/binutils/testsuite/binutils-all/objcopy.exp
+++ b/binutils/testsuite/binutils-all/objcopy.exp
@@ -1269,7 +1269,8 @@ if [is_elf_format] {
     run_dump_test "strip-9"
     run_dump_test "strip-12"
 
-    if { [istarget "mips64*-*-openbsd*"] } {
+    if { [istarget "mips64*-*-openbsd*"] \
+	 || [istarget "mips64*-*-*-gnuabi64"] } {
 	set reloc_format mips64
     }
     # A relocation type not supported by any target
diff --git a/binutils/testsuite/binutils-all/remove-relocs-01.d b/binutils/testsuite/binutils-all/remove-relocs-01.d
index 702747b..aeceba1 100644
--- a/binutils/testsuite/binutils-all/remove-relocs-01.d
+++ b/binutils/testsuite/binutils-all/remove-relocs-01.d
@@ -2,7 +2,7 @@
 #source: remove-relocs-01.s
 #objcopy: --remove-relocations=.data.relocs.01
 #readelf: -r
-#notarget: "mips64*-*-openbsd*"
+#notarget: mips64*-*-openbsd* mips64*-*-*-gnuabi64
 
 Relocation section '\.rela?\.data\.relocs\.02' at offset 0x[0-9a-f]+ contains 3 entries:
 .*
diff --git a/binutils/testsuite/binutils-all/remove-relocs-04.d b/binutils/testsuite/binutils-all/remove-relocs-04.d
index 1b8eab3..4ae7a90 100644
--- a/binutils/testsuite/binutils-all/remove-relocs-04.d
+++ b/binutils/testsuite/binutils-all/remove-relocs-04.d
@@ -2,7 +2,7 @@
 #source: remove-relocs-01.s
 #objcopy: --remove-relocations=.data.relocs.0\[12\]
 #readelf: -r
-#notarget: "mips64*-*-openbsd*"
+#notarget: mips64*-*-openbsd* mips64*-*-*-gnuabi64
 
 Relocation section '\.rela?\.data\.relocs\.03' at offset 0x[0-9a-f]+ contains 3 entries:
 .*
diff --git a/binutils/testsuite/binutils-all/remove-relocs-05.d b/binutils/testsuite/binutils-all/remove-relocs-05.d
index a429182..0f35917 100644
--- a/binutils/testsuite/binutils-all/remove-relocs-05.d
+++ b/binutils/testsuite/binutils-all/remove-relocs-05.d
@@ -2,7 +2,7 @@
 #source: remove-relocs-01.s
 #objcopy: --remove-section=.rela.data.relocs.01 --remove-section=.rel.data.relocs.01
 #readelf: -r
-#notarget: "mips64*-*-openbsd*"
+#notarget: mips64*-*-openbsd* mips64*-*-*-gnuabi64
 
 Relocation section '\.rela?\.data\.relocs\.02' at offset 0x[0-9a-f]+ contains 3 entries:
 .*
diff --git a/binutils/testsuite/binutils-all/remove-relocs-06.d b/binutils/testsuite/binutils-all/remove-relocs-06.d
index 5214bc7..f530d30 100644
--- a/binutils/testsuite/binutils-all/remove-relocs-06.d
+++ b/binutils/testsuite/binutils-all/remove-relocs-06.d
@@ -2,7 +2,7 @@
 #source: remove-relocs-01.s
 #objcopy: --remove-relocations=.data.relocs.* --remove-relocations=!.data.relocs.02
 #readelf: -r
-#notarget: "mips64*-*-openbsd*"
+#notarget: mips64*-*-openbsd* mips64*-*-*-gnuabi64
 
 Relocation section '\.rela?\.data\.relocs\.02' at offset 0x[0-9a-f]+ contains 3 entries:
 .*
diff --git a/gas/configure b/gas/configure
index e5023ff..aff5aec 100755
--- a/gas/configure
+++ b/gas/configure
@@ -12225,6 +12225,9 @@ _ACEOF
 	esac
 	# Decide which ABI to target by default.
 	case ${target} in
+	  mips64*-openbsd* | mips64*-linux-gnuabi64)
+	    mips_default_abi=N64_ABI
+	    ;;
 	  mips64*-linux* | mips-sgi-irix6* | mips64*-freebsd* \
 	  | mips64*-kfreebsd*-gnu | mips64*-ps2-elf*)
 	    mips_default_abi=N32_ABI
@@ -12232,9 +12235,6 @@ _ACEOF
 	  mips*-linux* | mips*-freebsd* | mips*-kfreebsd*-gnu)
 	    mips_default_abi=O32_ABI
 	    ;;
-	  mips64*-openbsd*)
-	    mips_default_abi=N64_ABI
-	    ;;
 	  *)
 	    mips_default_abi=NO_ABI
 	    ;;
diff --git a/gas/configure.ac b/gas/configure.ac
index e8e8f31..c3bd117 100644
--- a/gas/configure.ac
+++ b/gas/configure.ac
@@ -394,6 +394,9 @@ changequote([,])dnl
 	esac
 	# Decide which ABI to target by default.
 	case ${target} in
+	  mips64*-openbsd* | mips64*-linux-gnuabi64)
+	    mips_default_abi=N64_ABI
+	    ;;
 	  mips64*-linux* | mips-sgi-irix6* | mips64*-freebsd* \
 	  | mips64*-kfreebsd*-gnu | mips64*-ps2-elf*)
 	    mips_default_abi=N32_ABI
@@ -401,9 +404,6 @@ changequote([,])dnl
 	  mips*-linux* | mips*-freebsd* | mips*-kfreebsd*-gnu)
 	    mips_default_abi=O32_ABI
 	    ;;
-	  mips64*-openbsd*)
-	    mips_default_abi=N64_ABI
-	    ;;
 	  *)
 	    mips_default_abi=NO_ABI
 	    ;;
diff --git a/gas/testsuite/gas/mips/compact-eh-eb-7.d b/gas/testsuite/gas/mips/compact-eh-eb-7.d
index 6576e43..973e69f 100644
--- a/gas/testsuite/gas/mips/compact-eh-eb-7.d
+++ b/gas/testsuite/gas/mips/compact-eh-eb-7.d
@@ -2,7 +2,7 @@
 #name: Compact EH EB #7 with personality id and fallback FDE
 #source: compact-eh-7.s
 #as: -EB -mno-pdr
-#notarget: mips64*-*-openbsd*
+#notarget: mips64*-*-openbsd* mips64*-*-*-gnuabi64
 
 .*:     file format.*
 
diff --git a/gas/testsuite/gas/mips/compact-eh-el-7.d b/gas/testsuite/gas/mips/compact-eh-el-7.d
index 9a12da7..fb7dde9 100644
--- a/gas/testsuite/gas/mips/compact-eh-el-7.d
+++ b/gas/testsuite/gas/mips/compact-eh-el-7.d
@@ -2,7 +2,7 @@
 #name: Compact EH EL #7 with personality id and fallback FDE
 #source: compact-eh-7.s
 #as: -EL -mno-pdr
-#notarget: mips64*-*-openbsd*
+#notarget: mips64*-*-openbsd* mips64*-*-*-gnuabi64
 
 .*:     file format.*
 
diff --git a/ld/configure.tgt b/ld/configure.tgt
index 34c9d67..c62b958 100644
--- a/ld/configure.tgt
+++ b/ld/configure.tgt
@@ -580,10 +580,20 @@ mips*-*-vxworks*)	targ_emul=elf32ebmipvxworks
 			;;
 mips*-*-windiss)	targ_emul=elf32mipswindiss
 			;;
+mips64*el-*-linux-gnuabi64)
+			targ_emul=elf64ltsmip
+			targ_extra_emuls="elf64btsmip elf32ltsmipn32 elf32btsmipn32 elf32ltsmip elf32btsmip"
+			targ_extra_libpath=$targ_extra_emuls
+			;;
 mips64*el-*-linux-*)	targ_emul=elf32ltsmipn32
 			targ_extra_emuls="elf32btsmipn32 elf32ltsmip elf32btsmip elf64ltsmip elf64btsmip"
 			targ_extra_libpath=$targ_extra_emuls
 			;;
+mips64*-*-linux-gnuabi64)
+			targ_emul=elf64btsmip
+			targ_extra_emuls="elf64ltsmip elf32btsmipn32 elf32ltsmipn32 elf32btsmip elf32ltsmip"
+			targ_extra_libpath=$targ_extra_emuls
+			;;
 mips64*-*-linux-*)	targ_emul=elf32btsmipn32
 			targ_extra_emuls="elf32ltsmipn32 elf32btsmip elf32ltsmip elf64btsmip elf64ltsmip"
 			targ_extra_libpath=$targ_extra_emuls
diff --git a/ld/testsuite/ld-mips-elf/attr-gnu-4-10.d b/ld/testsuite/ld-mips-elf/attr-gnu-4-10.d
index 2ddb3d3..fe39ece 100644
--- a/ld/testsuite/ld-mips-elf/attr-gnu-4-10.d
+++ b/ld/testsuite/ld-mips-elf/attr-gnu-4-10.d
@@ -3,7 +3,7 @@
 #as: -mpdr
 #ld: -r
 #readelf: -hA
-#notarget: mips64*-*-openbsd*
+#notarget: mips64*-*-openbsd* mips64*-*-*-gnuabi64
 
 ELF Header:
   Magic:   .*
diff --git a/ld/testsuite/ld-mips-elf/compact-eh6.d b/ld/testsuite/ld-mips-elf/compact-eh6.d
index e81285a..a4a6978 100644
--- a/ld/testsuite/ld-mips-elf/compact-eh6.d
+++ b/ld/testsuite/ld-mips-elf/compact-eh6.d
@@ -4,7 +4,7 @@
 #as: -EB
 #readelf: -x .eh_frame_hdr
 #ld: -EB -e main
-#
+#notarget: mips64*-*-*-gnuabi64
 
 Hex dump of section \'\.eh_frame_hdr\':
 
diff --git a/ld/testsuite/ld-mips-elf/mips-elf.exp b/ld/testsuite/ld-mips-elf/mips-elf.exp
index 8be2bfc..e123ef5 100644
--- a/ld/testsuite/ld-mips-elf/mips-elf.exp
+++ b/ld/testsuite/ld-mips-elf/mips-elf.exp
@@ -155,13 +155,23 @@ if {[istarget *-*-openbsd*] } {
     if [istarget *el-*-*] {
 	set abi_asflags(o32) -32
 	set abi_ldflags(o32) -melf32ltsmip
-	set abi_asflags(n64) "-march=from-abi -64"
-	set abi_ldflags(n64) -melf64ltsmip
+	if [istarget *-*-*-gnuabi64] {
+	    set abi_asflags(n32) "-march=from-abi -n32"
+	    set abi_ldflags(n32) -melf32ltsmipn32
+	} else {
+	    set abi_asflags(n64) "-march=from-abi -64"
+	    set abi_ldflags(n64) -melf64ltsmip
+	}
     } else {
 	set abi_asflags(o32) -32
 	set abi_ldflags(o32) -melf32btsmip
-	set abi_asflags(n64) "-march=from-abi -64"
-	set abi_ldflags(n64) -melf64btsmip
+	if [istarget *-*-*-gnuabi64] {
+	    set abi_asflags(n32) "-march=from-abi -n32"
+	    set abi_ldflags(n32) -melf32btsmipn32
+	} else {
+	    set abi_asflags(n64) "-march=from-abi -64"
+	    set abi_ldflags(n64) -melf64btsmip
+	}
     }
     set irixemul 0
 } elseif {[istarget *-*-linux*] } {
@@ -811,7 +821,8 @@ if { $linux_gnu } {
     run_dump_test "got-page-1"
     run_dump_test_n32 "got-page-2"
     run_dump_test_n64 "dyn-sec64" noarch
-    run_dump_test "got-page-3"
+    run_dump_test_o32 "got-page-3"
+    run_dump_test_n32 "got-page-3" [list [list name (n32)]]
     if $has_abi(o32) {
 	run_ld_link_tests [subst {
 	    {"GOT page 4 (one file)"
diff --git a/ld/testsuite/ld-undefined/undefined.exp b/ld/testsuite/ld-undefined/undefined.exp
index 05b1131..c0479a2 100644
--- a/ld/testsuite/ld-undefined/undefined.exp
+++ b/ld/testsuite/ld-undefined/undefined.exp
@@ -206,7 +206,8 @@ if { ![is_elf_format] || ![check_shared_lib_support]} then {
     # triplets, and S+core targets using an extra R_SCORE_NONE
     # relocation, so adjust for that.
     switch -glob $target_triplet {
-	"mips64*-*-openbsd*" {
+	"mips64*-*-openbsd*" -
+	"mips64*-*-*-gnuabi64" {
 	    set none_count 6
 	    set reloc_count 4
 	}