Add minimal support for WebAssembly backend to the BFD library.

include * elf/wasm32.h: New file to support wasm32 architecture.

bfd * cpu-wasm32.c: New file to support wasm32 architecture.
    * elf32-wasm32.c: New file to support wasm32 architecture.
    * Makefile.am: Add wasm32 architecture.
    * archures.c: Likewise.
    * config.bfd: Likewise.
    * configure.ac: Likewise.
    * targets.c: Likewise.

11 files changed, 116 insertions, 0 deletions

diff --git a/bfd/Makefile.am b/bfd/Makefile.am
index 0b0226306f3..6fa83020200 100644
--- a/bfd/Makefile.am
+++ b/bfd/Makefile.am
@@ -169,6 +169,7 @@ ALL_MACHINES = \
 	cpu-vax.lo \
 	cpu-visium.lo \
 	cpu-w65.lo \
+	cpu-wasm32.lo \
 	cpu-we32k.lo \
 	cpu-xc16x.lo \
 	cpu-xgate.lo \
@@ -257,6 +258,7 @@ ALL_MACHINES_CFILES = \
 	cpu-v850_rh850.c \
 	cpu-vax.c \
 	cpu-visium.c \
+	cpu-wasm32.c \
 	cpu-w65.c \
 	cpu-we32k.c \
 	cpu-xc16x.c \
@@ -383,6 +385,7 @@ BFD32_BACKENDS = \
 	elf32-v850.lo \
 	elf32-vax.lo \
 	elf32-visium.lo \
+	elf32-wasm32.lo \
 	elf32-xc16x.lo \
 	elf32-xgate.lo \
 	elf32-xstormy16.lo \
@@ -576,6 +579,7 @@ BFD32_BACKENDS_CFILES = \
 	elf32-v850.c \
 	elf32-vax.c \
 	elf32-visium.c \
+	elf32-wasm32.c \
 	elf32-xc16x.c \
 	elf32-xgate.c \
 	elf32-xstormy16.c \
diff --git a/bfd/Makefile.in b/bfd/Makefile.in
index 096c7ef0438..76916b7d10f 100644
--- a/bfd/Makefile.in
+++ b/bfd/Makefile.in
@@ -502,6 +502,7 @@ ALL_MACHINES = \
 	cpu-vax.lo \
 	cpu-visium.lo \
 	cpu-w65.lo \
+	cpu-wasm32.lo \
 	cpu-we32k.lo \
 	cpu-xc16x.lo \
 	cpu-xgate.lo \
@@ -590,6 +591,7 @@ ALL_MACHINES_CFILES = \
 	cpu-v850_rh850.c \
 	cpu-vax.c \
 	cpu-visium.c \
+	cpu-wasm32.c \
 	cpu-w65.c \
 	cpu-we32k.c \
 	cpu-xc16x.c \
@@ -717,6 +719,7 @@ BFD32_BACKENDS = \
 	elf32-v850.lo \
 	elf32-vax.lo \
 	elf32-visium.lo \
+	elf32-wasm32.lo \
 	elf32-xc16x.lo \
 	elf32-xgate.lo \
 	elf32-xstormy16.lo \
@@ -910,6 +913,7 @@ BFD32_BACKENDS_CFILES = \
 	elf32-v850.c \
 	elf32-vax.c \
 	elf32-visium.c \
+	elf32-wasm32.c \
 	elf32-xc16x.c \
 	elf32-xgate.c \
 	elf32-xstormy16.c \
@@ -1446,6 +1450,7 @@ distclean-compile:
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/cpu-vax.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/cpu-visium.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/cpu-w65.Plo@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/cpu-wasm32.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/cpu-we32k.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/cpu-xc16x.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/cpu-xgate.Plo@am__quote@
@@ -1534,6 +1539,7 @@ distclean-compile:
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/elf32-v850.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/elf32-vax.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/elf32-visium.Plo@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/elf32-wasm32.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/elf32-xc16x.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/elf32-xgate.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/elf32-xstormy16.Plo@am__quote@
diff --git a/bfd/archures.c b/bfd/archures.c
index c909db012da..c6e71520574 100644
--- a/bfd/archures.c
+++ b/bfd/archures.c
@@ -528,6 +528,8 @@ DESCRIPTION
 .#define bfd_mach_nios2r2	2
 .  bfd_arch_visium,	{* Visium *}
 .#define bfd_mach_visium	1
+.  bfd_arch_wasm32,     {* WebAssembly *}
+.#define bfd_mach_wasm32        1
 .  bfd_arch_pru,	{* PRU *}
 .#define bfd_mach_pru	0
 .  bfd_arch_last
@@ -654,6 +656,7 @@ extern const bfd_arch_info_type bfd_v850_arch;
 extern const bfd_arch_info_type bfd_v850_rh850_arch;
 extern const bfd_arch_info_type bfd_vax_arch;
 extern const bfd_arch_info_type bfd_visium_arch;
+extern const bfd_arch_info_type bfd_wasm32_arch;
 extern const bfd_arch_info_type bfd_w65_arch;
 extern const bfd_arch_info_type bfd_we32k_arch;
 extern const bfd_arch_info_type bfd_xstormy16_arch;
@@ -746,6 +749,7 @@ static const bfd_arch_info_type * const bfd_archures_list[] =
     &bfd_vax_arch,
     &bfd_visium_arch,
     &bfd_w65_arch,
+    &bfd_wasm32_arch,
     &bfd_we32k_arch,
     &bfd_xstormy16_arch,
     &bfd_xtensa_arch,
diff --git a/bfd/bfd-in2.h b/bfd/bfd-in2.h
index 59403af6986..adfcefdcdc7 100644
--- a/bfd/bfd-in2.h
+++ b/bfd/bfd-in2.h
@@ -2372,6 +2372,8 @@ enum bfd_architecture
 #define bfd_mach_nios2r2       2
   bfd_arch_visium,     /* Visium */
 #define bfd_mach_visium        1
+  bfd_arch_wasm32,     /* WebAssembly */
+#define bfd_mach_wasm32        1
   bfd_arch_pru,        /* PRU */
 #define bfd_mach_pru   0
   bfd_arch_last
diff --git a/bfd/config.bfd b/bfd/config.bfd
index 52db9a47f10..abcb7ae210c 100644
--- a/bfd/config.bfd
+++ b/bfd/config.bfd
@@ -197,6 +197,7 @@ tilegx*)	 targ_archs=bfd_tilegx_arch ;;
 tilepro*)	 targ_archs=bfd_tilepro_arch ;;
 v850*)		 targ_archs="bfd_v850_arch bfd_v850_rh850_arch" ;;
 visium*)	 targ_archs=bfd_visium_arch ;;
+wasm32)		 targ_archs=bfd_wasm32_arch ;;
 x86_64*)	 targ_archs=bfd_i386_arch ;;
 xtensa*)	 targ_archs=bfd_xtensa_arch ;;
 xgate)		 targ_archs=bfd_xgate_arch ;;
@@ -1793,6 +1794,10 @@ case "${targ}" in
     targ_defvec=visium_elf32_vec
     ;;
 
+  wasm32-*-*)
+    targ_defvec=wasm32_elf32_vec
+    ;;
+
   we32k-*-*)
     targ_defvec=we32k_coff_vec
     ;;
diff --git a/bfd/configure b/bfd/configure
index 83256d25dfd..57beb64b3b1 100755
--- a/bfd/configure
+++ b/bfd/configure
@@ -14569,6 +14569,7 @@ do
     ft32_elf32_vec)		 tb="$tb elf32-ft32.lo elf32.lo $elf" ;;
     visium_elf32_vec)		 tb="$tb elf32-visium.lo elf32.lo $elf" ;;
     w65_coff_vec)		 tb="$tb coff-w65.lo reloc16.lo $coffgen" ;;
+    wasm32_elf32_vec)            tb="$tb elf32-wasm32.lo elf32.lo $elf" ;;
     we32k_coff_vec)		 tb="$tb coff-we32k.lo $coffgen" ;;
     x86_64_coff_vec)		 tb="$tb coff-x86_64.lo $coff"; target_size=64 ;;
     x86_64_elf32_vec)		 tb="$tb elf64-x86-64.lo elf-ifunc.lo elf-nacl.lo elf64.lo elf32.lo $elf"; target_size=64 ;;
diff --git a/bfd/configure.ac b/bfd/configure.ac
index ee0c537ea27..77961945d16 100644
--- a/bfd/configure.ac
+++ b/bfd/configure.ac
@@ -700,6 +700,7 @@ do
     ft32_elf32_vec)		 tb="$tb elf32-ft32.lo elf32.lo $elf" ;;
     visium_elf32_vec)		 tb="$tb elf32-visium.lo elf32.lo $elf" ;;
     w65_coff_vec)		 tb="$tb coff-w65.lo reloc16.lo $coffgen" ;;
+    wasm32_elf32_vec)            tb="$tb elf32-wasm32.lo elf32.lo $elf" ;;
     we32k_coff_vec)		 tb="$tb coff-we32k.lo $coffgen" ;;
     x86_64_coff_vec)		 tb="$tb coff-x86_64.lo $coff"; target_size=64 ;;
     x86_64_elf32_vec)		 tb="$tb elf64-x86-64.lo elf-ifunc.lo elf-nacl.lo elf64.lo elf32.lo $elf"; target_size=64 ;;
diff --git a/bfd/cpu-wasm32.c b/bfd/cpu-wasm32.c
new file mode 100644
index 00000000000..19d4cb92709
--- /dev/null
+++ b/bfd/cpu-wasm32.c
@@ -0,0 +1,36 @@
+/* BFD support for the WebAssembly target
+   Copyright (C) 2017 Free Software Foundation, Inc.
+
+   This file is part of BFD, the Binary File Descriptor library.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
+   MA 02110-1301, USA.  */
+
+#include "sysdep.h"
+#include "bfd.h"
+#include "libbfd.h"
+#include "libiberty.h"
+
+#define N(number, print, default, next)  \
+{  32, 32, 8, bfd_arch_wasm32, number, "wasm32", "wasm32", 4, default, bfd_default_compatible, \
+   bfd_default_scan, bfd_arch_default_fill, next }
+
+static const bfd_arch_info_type arch_info_struct[] =
+{
+  N (bfd_mach_wasm32, "wasm32", TRUE, NULL)
+};
+
+const bfd_arch_info_type bfd_wasm32_arch =
+  N (bfd_mach_wasm32, "wasm32", TRUE, & arch_info_struct[0]);
diff --git a/bfd/elf32-wasm32.c b/bfd/elf32-wasm32.c
new file mode 100644
index 00000000000..9b3827248fb
--- /dev/null
+++ b/bfd/elf32-wasm32.c
@@ -0,0 +1,52 @@
+/* 32-bit ELF for the WebAssembly target
+   Copyright (C) 2017 Free Software Foundation, Inc.
+
+   This file is part of BFD, the Binary File Descriptor library.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 51 Franklin Street - Fifth Floor,
+   Boston, MA 02110-1301, USA.  */
+
+#include "sysdep.h"
+#include "bfd.h"
+#include "libbfd.h"
+#include "elf-bfd.h"
+#include "bfd_stdint.h"
+#include "elf/wasm32.h"
+
+#define ELF_ARCH		bfd_arch_wasm32
+#define ELF_TARGET_ID		EM_WEBASSEMBLY
+#define ELF_MACHINE_CODE	EM_WEBASSEMBLY
+/* FIXME we don't have paged executables, see:
+   https://github.com/pipcet/binutils-gdb/issues/4  */
+#define ELF_MAXPAGESIZE		4096
+
+#define TARGET_LITTLE_SYM       wasm32_elf32_vec
+#define TARGET_LITTLE_NAME	"elf32-wasm32"
+
+#define elf_backend_can_gc_sections     1
+#define elf_backend_rela_normal         1
+/* For testing. */
+#define elf_backend_want_dynrelro       1
+
+#define bfd_elf32_bfd_reloc_type_lookup _bfd_norelocs_bfd_reloc_type_lookup
+#define bfd_elf32_bfd_reloc_name_lookup _bfd_norelocs_bfd_reloc_name_lookup
+
+#define ELF_DYNAMIC_INTERPRETER  "/sbin/elf-dynamic-interpreter.so"
+
+#define elf_backend_want_got_plt 	1
+#define elf_backend_plt_readonly 	1
+#define elf_backend_got_header_size 	0
+
+#include "elf32-target.h"
diff --git a/bfd/po/SRC-POTFILES.in b/bfd/po/SRC-POTFILES.in
index 7ecdb0a11f3..81f42ea3f94 100644
--- a/bfd/po/SRC-POTFILES.in
+++ b/bfd/po/SRC-POTFILES.in
@@ -141,6 +141,7 @@ cpu-v850_rh850.c
 cpu-vax.c
 cpu-visium.c
 cpu-w65.c
+cpu-wasm32.c
 cpu-we32k.c
 cpu-xc16x.c
 cpu-xgate.c
@@ -231,6 +232,7 @@ elf32-tilepro.c
 elf32-v850.c
 elf32-vax.c
 elf32-visium.c
+elf32-wasm32.c
 elf32-xc16x.c
 elf32-xgate.c
 elf32-xstormy16.c
diff --git a/bfd/targets.c b/bfd/targets.c
index 1a7c6b87d62..74559ac4c6e 100644
--- a/bfd/targets.c
+++ b/bfd/targets.c
@@ -893,6 +893,7 @@ extern const bfd_target vax_aout_nbsd_vec;
 extern const bfd_target vax_elf32_vec;
 extern const bfd_target visium_elf32_vec;
 extern const bfd_target w65_coff_vec;
+extern const bfd_target wasm32_elf32_vec;
 extern const bfd_target we32k_coff_vec;
 extern const bfd_target x86_64_coff_vec;
 extern const bfd_target x86_64_elf32_vec;
@@ -1421,6 +1422,8 @@ static const bfd_target * const _bfd_target_vector[] =
 
 	&w65_coff_vec,
 
+        &wasm32_elf32_vec,
+
 	&we32k_coff_vec,
 
 #ifdef BFD64