--- bfd/config.bfd
+++ bfd/config.bfd
@@ -177,6 +177,11 @@
     targ_selvecs="aarch64_elf64_le_vec aarch64_elf32_le_vec aarch64_elf32_be_vec arm_elf32_be_vec arm_elf32_le_vec"
     want64=true
     ;;
+  aarch64-*-cloudabi*)
+    targ_defvec=aarch64_elf64_le_cloudabi_vec
+    targ_selvecs=aarch64_elf64_be_cloudabi_vec
+    want64=true
+    ;;
   aarch64-*-linux*)
     targ_defvec=aarch64_elf64_le_vec
     targ_selvecs="aarch64_elf64_be_vec aarch64_elf32_le_vec aarch64_elf32_be_vec arm_elf32_le_vec arm_elf32_be_vec"
--- bfd/configure
+++ bfd/configure
@@ -15288,7 +15288,9 @@
     aarch64_elf32_be_vec)	 tb="$tb elf32-aarch64.lo elfxx-aarch64.lo elf-ifunc.lo elf32.lo $elf"; target_size=64 ;;
     aarch64_elf32_le_vec)	 tb="$tb elf32-aarch64.lo elfxx-aarch64.lo elf-ifunc.lo elf32.lo $elf"; target_size=64 ;;
     aarch64_elf64_be_vec)	 tb="$tb elf64-aarch64.lo elfxx-aarch64.lo elf-ifunc.lo elf64.lo $elf"; target_size=64 ;;
+    aarch64_elf64_be_cloudabi_vec) tb="$tb elf64-aarch64.lo elfxx-aarch64.lo elf-ifunc.lo elf64.lo $elf"; target_size=64 ;;
     aarch64_elf64_le_vec)	 tb="$tb elf64-aarch64.lo elfxx-aarch64.lo elf-ifunc.lo elf64.lo $elf"; target_size=64 ;;
+    aarch64_elf64_le_cloudabi_vec) tb="$tb elf64-aarch64.lo elfxx-aarch64.lo elf-ifunc.lo elf64.lo $elf"; target_size=64 ;;
     alpha_ecoff_le_vec)		 tb="$tb coff-alpha.lo ecoff.lo ecofflink.lo"; target_size=64 ;;
     alpha_elf64_vec)		 tb="$tb elf64-alpha.lo elf64.lo $elf"; target_size=64 ;;
     alpha_elf64_fbsd_vec)	 tb="$tb elf64-alpha.lo elf64.lo $elf"; target_size=64 ;;
--- bfd/elfnn-aarch64.c
+++ bfd/elfnn-aarch64.c
@@ -8061,3 +8061,22 @@
 #define elf_backend_obj_attrs_section		".ARM.attributes"
 
 #include "elfNN-target.h"
+
+/* CloudABI support.  */
+
+#undef	TARGET_LITTLE_SYM
+#define	TARGET_LITTLE_SYM	aarch64_elfNN_le_cloudabi_vec
+#undef	TARGET_LITTLE_NAME
+#define	TARGET_LITTLE_NAME	"elfNN-littleaarch64-cloudabi"
+#undef	TARGET_BIG_SYM
+#define	TARGET_BIG_SYM		aarch64_elfNN_be_cloudabi_vec
+#undef	TARGET_BIG_NAME
+#define	TARGET_BIG_NAME		"elfNN-bigaarch64-cloudabi"
+
+#undef	ELF_OSABI
+#define	ELF_OSABI		ELFOSABI_CLOUDABI
+
+#undef	elfNN_bed
+#define	elfNN_bed		elfNN_aarch64_cloudabi_bed
+
+#include "elfNN-target.h"
--- bfd/targets.c
+++ bfd/targets.c
@@ -563,7 +563,9 @@
 extern const bfd_target aarch64_elf32_be_vec;
 extern const bfd_target aarch64_elf32_le_vec;
 extern const bfd_target aarch64_elf64_be_vec;
+extern const bfd_target aarch64_elf64_be_cloudabi_vec;
 extern const bfd_target aarch64_elf64_le_vec;
+extern const bfd_target aarch64_elf64_le_cloudabi_vec;
 extern const bfd_target alpha_ecoff_le_vec;
 extern const bfd_target alpha_elf64_vec;
 extern const bfd_target alpha_elf64_fbsd_vec;
@@ -938,7 +940,9 @@
 	&aarch64_elf32_be_vec,
 	&aarch64_elf32_le_vec,
 	&aarch64_elf64_be_vec,
+	&aarch64_elf64_be_cloudabi_vec,
 	&aarch64_elf64_le_vec,
+	&aarch64_elf64_le_cloudabi_vec,
 #endif
 
 #ifdef BFD64
--- gas/configure.tgt
+++ gas/configure.tgt
@@ -470,6 +470,7 @@ case ${generic_target} in
   z8k-*-coff | z8k-*-sim)		fmt=coff ;;
 
   *-*-aout | *-*-scout)			fmt=aout ;;
+  *-*-cloudabi*)			fmt=elf ;;
   *-*-dragonfly*)			fmt=elf em=dragonfly ;;
   *-*-freebsd* | *-*-kfreebsd*-gnu)	fmt=elf em=freebsd ;;
   *-*-bsd*)				fmt=aout em=sun3 ;;
--- include/elf/common.h
+++ include/elf/common.h
@@ -73,6 +73,8 @@
 #define ELFOSABI_NSK	     14	/* Hewlett-Packard Non-Stop Kernel */
 #define ELFOSABI_AROS	     15	/* AROS */
 #define ELFOSABI_FENIXOS     16 /* FenixOS */
+#define ELFOSABI_CLOUDABI    17 /* Nuxi CloudABI */
+#define ELFOSABI_BSDSUNIX    19 /* BSDSUniX */
 #define ELFOSABI_C6000_ELFABI 64 /* Bare-metal TMS320C6000 */
 #define ELFOSABI_C6000_LINUX 65 /* Linux TMS320C6000 */
 #define ELFOSABI_ARM	     97	/* ARM */
--- ld/Makefile.in
+++ ld/Makefile.in
@@ -727,6 +727,8 @@
 	eaarch64elf32.c \
 	eaarch64elfb.c \
 	eaarch64elf32b.c \
+	eaarch64cloudabi.c \
+	eaarch64cloudabib.c \
 	eaarch64linux.c \
 	eaarch64linuxb.c \
 	eaarch64linux32.c \
@@ -3001,6 +3003,14 @@
   $(ELF_DEPS) $(srcdir)/emultempl/aarch64elf.em \
   $(srcdir)/scripttempl/elf.sc ${GEN_DEPENDS}
 
+eaarch64cloudabi.c: $(srcdir)/emulparams/aarch64cloudabi.sh \
+  $(ELF_DEPS) $(srcdir)/emultempl/aarch64elf.em \
+  $(srcdir)/scripttempl/elf.sc ${GEN_DEPENDS}
+
+eaarch64cloudabib.c: $(srcdir)/emulparams/aarch64cloudabib.sh $(srcdir)/emulparams/aarch64cloudabi.sh \
+  $(ELF_DEPS) $(srcdir)/emultempl/aarch64elf.em \
+  $(srcdir)/scripttempl/elf.sc ${GEN_DEPENDS}
+
 eaarch64linux.c: $(srcdir)/emulparams/aarch64linux.sh \
   $(ELF_DEPS) $(srcdir)/emultempl/aarch64elf.em \
   $(srcdir)/scripttempl/elf.sc ${GEN_DEPENDS}
--- ld/configure.tgt
+++ ld/configure.tgt
@@ -49,6 +49,8 @@
 			targ_extra_emuls="aarch64elf aarch64elf32 aarch64elf32b armelfb armelf" ;;
 aarch64-*-elf)		targ_emul=aarch64elf
 			targ_extra_emuls="aarch64elf32 aarch64elf32b aarch64elfb armelf armelfb" ;;
+aarch64-*-cloudabi*)	targ_emul=aarch64cloudabi
+			targ_extra_emuls=aarch64cloudabib ;;
 aarch64_be-*-linux*)	targ_emul=aarch64linuxb
 			targ_extra_libpath="aarch64linux aarch64linux32 aarch64linux32b armelfb_linux_eabi armelf_linux_eabi"
 			targ_extra_emuls="aarch64elfb aarch64elf aarch64elf32 aarch64elf32b armelfb armelf $targ_extra_libpath" ;;
--- ld/emulparams/aarch64cloudabi.sh
+++ ld/emulparams/aarch64cloudabi.sh
@@ -0,0 +1,37 @@
+ARCH=aarch64
+MACHINE=
+NOP=0
+
+SCRIPT_NAME=elf
+ELFSIZE=64
+OUTPUT_FORMAT="elf64-littleaarch64-cloudabi"
+BIG_OUTPUT_FORMAT="elf64-bigaarch64-cloudabi"
+LITTLE_OUTPUT_FORMAT="elf64-littleaarch64-cloudabi"
+NO_REL_RELOCS=yes
+
+TEMPLATE_NAME=elf32
+EXTRA_EM_FILE=aarch64elf
+
+GENERATE_SHLIB_SCRIPT=yes
+GENERATE_PIE_SCRIPT=yes
+
+MAXPAGESIZE="CONSTANT (MAXPAGESIZE)"
+COMMONPAGESIZE="CONSTANT (COMMONPAGESIZE)"
+SEPARATE_GOTPLT=24
+IREL_IN_PLT=
+
+TEXT_START_ADDR=0x400000
+
+DATA_START_SYMBOLS='PROVIDE (__data_start = .);';
+
+# AArch64 does not support .s* sections.
+NO_SMALL_DATA=yes
+
+OTHER_BSS_SYMBOLS='__bss_start__ = .;'
+OTHER_BSS_END_SYMBOLS='_bss_end__ = . ; __bss_end__ = . ;'
+OTHER_END_SYMBOLS='__end__ = . ;'
+
+OTHER_SECTIONS='.note.gnu.arm.ident 0 : { KEEP (*(.note.gnu.arm.ident)) }'
+ATTRS_SECTIONS='.ARM.attributes 0 : { KEEP (*(.ARM.attributes)) KEEP (*(.gnu.attributes)) }'
+# Ensure each PLT entry is aligned to a cache line.
+PLT=".plt          ${RELOCATING-0} : ALIGN(16) { *(.plt)${IREL_IN_PLT+ *(.iplt)} }"
--- ld/emulparams/aarch64cloudabib.sh
+++ ld/emulparams/aarch64cloudabib.sh
@@ -0,0 +1,2 @@
+. ${srcdir}/emulparams/aarch64cloudabi.sh
+OUTPUT_FORMAT="elf64-bigaarch64-cloudabi"