Allow objdump to recognise the System.Runtime.dll files that get shipped with .NET Core 2.1.

include	* coff/i386.h (IMAGE_FILE_MACHINE_NATIVE_APPLE_OVERRIDE): Define.
	(IMAGE_FILE_MACHINE_NATIVE_FREEBSD_OVERRIDE): Define.
	(IMAGE_FILE_MACHINE_NATIVE_LINUX_OVERRIDE): Define.
	(IMAGE_FILE_MACHINE_NATIVE_NETBSD_OVERRIDE): Define.
	(I386_APPLE_MAGIC): Define.
	(I386_FREEBSD_MAGIC): Define.
	(I386_LINUX_MAGIC): Define.
	(I386_NETBSD_MAGIC): Define.
	(I386BADMAG): Extend macro to allow new magic numbers.
	* coff/x86_64.h (IMAGE_FILE_MACHINE_NATIVE_APPLE_OVERRIDE): Define.
	(IMAGE_FILE_MACHINE_NATIVE_FREEBSD_OVERRIDE): Define.
	(IMAGE_FILE_MACHINE_NATIVE_LINUX_OVERRIDE): Define.
	(IMAGE_FILE_MACHINE_NATIVE_NETBSD_OVERRIDE): Define.
	(AMD64_APPLE_MAGIC): Define.
	(AMD64_FREEBSD_MAGIC): Define.
	(AMD64_LINUX_MAGIC): Define.
	(AMD64_NETBSD_MAGIC): Define.
	(AMD64BADMAG): Extend macro to allow new magic numbers.

bfd	* coffcode.h (coff_set_arch_mach_hook): Handle I386_APPLE_MAGIC,
	I386_FREEBSD_MAGIC, I386_LINUX_MAGIC, I386_NETBSD_MAGIC,
	AMD64_APPLE_MAGIC, AMD64_FREEBSD_MAGIC, AMD64_LINUX_MAGIC,
	AMD64_NETBSD_MAGIC.
	* peXXigen.c: Add comment about source of .NET magic numbers.

binutils* Makefile.am (AUTOMAKE_OPTIONS): Add subdir-objects
	(GENTESTDLLSPROG): Define.
	(TEST_PROGS): Add GENTESTDLLSPROG.
	* Makefile.in: Regenerate.
	* testsuite/binutils-all/objdump.exp
	(test_objdump_dotnet_assemblies): New proc.
	Run the new proc.
	* testsuite/gentestdlls.c: New source file.

5 files changed, 251 insertions, 16 deletions

diff --git a/binutils/ChangeLog b/binutils/ChangeLog
index d723171..5238b47 100644
--- a/binutils/ChangeLog
+++ b/binutils/ChangeLog
@@ -1,3 +1,14 @@
+2019-07-23  Omar Majid  <omajid@redhat.com>
+
+	* Makefile.am (AUTOMAKE_OPTIONS): Add subdir-objects
+	(GENTESTDLLSPROG): Define.
+	(TEST_PROGS): Add GENTESTDLLSPROG.
+	* Makefile.in: Regenerate.
+	* testsuite/binutils-all/objdump.exp
+	(test_objdump_dotnet_assemblies): New proc.
+	Run the new proc.
+	* testsuite/gentestdlls.c: New source file.
+
 2019-06-28  Nick Clifton  <nickc@redhat.com>
 
 	PR 24707
diff --git a/binutils/Makefile.am b/binutils/Makefile.am
index 128494c..de93ffa 100644
--- a/binutils/Makefile.am
+++ b/binutils/Makefile.am
@@ -17,7 +17,7 @@
 # <http://www.gnu.org/licenses/>.
 #
 
-AUTOMAKE_OPTIONS = dejagnu no-dist foreign
+AUTOMAKE_OPTIONS = dejagnu no-dist foreign subdir-objects
 ACLOCAL_AMFLAGS = -I .. -I ../config -I ../bfd
 
 SUBDIRS = doc po
@@ -93,8 +93,9 @@ EXTRA_SCRIPTS = embedspu
 ## Test programs.
 BFDTEST1_PROG = bfdtest1
 BFDTEST2_PROG = bfdtest2
+GENTESTDLLS_PROG = testsuite/gentestdlls
 
-TEST_PROGS = $(BFDTEST1_PROG) $(BFDTEST2_PROG)
+TEST_PROGS = $(BFDTEST1_PROG) $(BFDTEST2_PROG) $(GENTESTDLLS_PROG)
 
 ## We need a special rule to install the programs which are built with
 ## -new, and to rename cxxfilt to c++filt.
diff --git a/binutils/Makefile.in b/binutils/Makefile.in
index 13b3b19..16c078f 100644
--- a/binutils/Makefile.in
+++ b/binutils/Makefile.in
@@ -113,7 +113,7 @@ bin_PROGRAMS = $(am__EXEEXT_5) $(am__EXEEXT_6) $(am__EXEEXT_7) \
 	@BUILD_SRCONV@ @BUILD_DLLTOOL@ @BUILD_WINDRES@ @BUILD_WINDMC@ \
 	$(am__EXEEXT_11) $(am__EXEEXT_12) $(am__EXEEXT_13) \
 	@BUILD_DLLWRAP@ $(am__empty)
-noinst_PROGRAMS = $(am__EXEEXT_17) $(am__EXEEXT_20) @BUILD_MISC@
+noinst_PROGRAMS = $(am__EXEEXT_17) $(am__EXEEXT_21) @BUILD_MISC@
 EXTRA_PROGRAMS = srconv$(EXEEXT) sysdump$(EXEEXT) coffdump$(EXEEXT) \
 	$(am__EXEEXT_1) $(am__EXEEXT_2) $(am__EXEEXT_3) \
 	$(am__EXEEXT_4)
@@ -169,7 +169,8 @@ am__EXEEXT_16 = cxxfilt$(EXEEXT)
 am__EXEEXT_17 = $(am__EXEEXT_14) $(am__EXEEXT_15) $(am__EXEEXT_16)
 am__EXEEXT_18 = bfdtest1$(EXEEXT)
 am__EXEEXT_19 = bfdtest2$(EXEEXT)
-am__EXEEXT_20 = $(am__EXEEXT_18) $(am__EXEEXT_19)
+am__EXEEXT_20 = testsuite/gentestdlls$(EXEEXT)
+am__EXEEXT_21 = $(am__EXEEXT_18) $(am__EXEEXT_19) $(am__EXEEXT_20)
 PROGRAMS = $(bin_PROGRAMS) $(noinst_PROGRAMS)
 am__objects_1 = bucomm.$(OBJEXT) version.$(OBJEXT) filemode.$(OBJEXT)
 am_addr2line_OBJECTS = addr2line.$(OBJEXT) $(am__objects_1)
@@ -243,6 +244,12 @@ strip_new_LDADD = $(LDADD)
 am_sysdump_OBJECTS = sysdump.$(OBJEXT) $(am__objects_1)
 sysdump_OBJECTS = $(am_sysdump_OBJECTS)
 sysdump_LDADD = $(LDADD)
+testsuite_gentestdlls_SOURCES = testsuite/gentestdlls.c
+am__dirstamp = $(am__leading_dot)dirstamp
+testsuite_gentestdlls_OBJECTS = testsuite/gentestdlls.$(OBJEXT)
+testsuite_gentestdlls_LDADD = $(LDADD)
+testsuite_gentestdlls_DEPENDENCIES = $(BFDLIB) $(LIBIBERTY) \
+	$(am__DEPENDENCIES_1)
 am_windmc_OBJECTS = windmc.$(OBJEXT) mcparse.$(OBJEXT) mclex.$(OBJEXT) \
 	winduni.$(OBJEXT) $(am__objects_1)
 windmc_OBJECTS = $(am_windmc_OBJECTS)
@@ -338,8 +345,8 @@ SOURCES = $(addr2line_SOURCES) $(ar_SOURCES) $(EXTRA_ar_SOURCES) \
 	$(nm_new_SOURCES) $(objcopy_SOURCES) $(objdump_SOURCES) \
 	$(EXTRA_objdump_SOURCES) $(ranlib_SOURCES) $(readelf_SOURCES) \
 	$(size_SOURCES) $(srconv_SOURCES) $(strings_SOURCES) \
-	$(strip_new_SOURCES) $(sysdump_SOURCES) $(windmc_SOURCES) \
-	$(windres_SOURCES)
+	$(strip_new_SOURCES) $(sysdump_SOURCES) \
+	testsuite/gentestdlls.c $(windmc_SOURCES) $(windres_SOURCES)
 RECURSIVE_TARGETS = all-recursive check-recursive cscopelist-recursive \
 	ctags-recursive dvi-recursive html-recursive info-recursive \
 	install-data-recursive install-dvi-recursive \
@@ -548,7 +555,7 @@ top_builddir = @top_builddir@
 top_srcdir = @top_srcdir@
 zlibdir = @zlibdir@
 zlibinc = @zlibinc@
-AUTOMAKE_OPTIONS = dejagnu no-dist foreign
+AUTOMAKE_OPTIONS = dejagnu no-dist foreign subdir-objects
 ACLOCAL_AMFLAGS = -I .. -I ../config -I ../bfd
 SUBDIRS = doc po
 tooldir = $(exec_prefix)/$(target_alias)
@@ -595,7 +602,8 @@ bin_SCRIPTS = @BUILD_INSTALL_MISC@
 EXTRA_SCRIPTS = embedspu
 BFDTEST1_PROG = bfdtest1
 BFDTEST2_PROG = bfdtest2
-TEST_PROGS = $(BFDTEST1_PROG) $(BFDTEST2_PROG)
+GENTESTDLLS_PROG = testsuite/gentestdlls
+TEST_PROGS = $(BFDTEST1_PROG) $(BFDTEST2_PROG) $(GENTESTDLLS_PROG)
 RENAMED_PROGS = $(NM_PROG) $(STRIP_PROG) $(DEMANGLER_PROG)
 
 # Stuff that goes in tooldir/ if appropriate.
@@ -940,6 +948,18 @@ strip-new$(EXEEXT): $(strip_new_OBJECTS) $(strip_new_DEPENDENCIES) $(EXTRA_strip
 sysdump$(EXEEXT): $(sysdump_OBJECTS) $(sysdump_DEPENDENCIES) $(EXTRA_sysdump_DEPENDENCIES) 
 	@rm -f sysdump$(EXEEXT)
 	$(AM_V_CCLD)$(LINK) $(sysdump_OBJECTS) $(sysdump_LDADD) $(LIBS)
+testsuite/$(am__dirstamp):
+	@$(MKDIR_P) testsuite
+	@: > testsuite/$(am__dirstamp)
+testsuite/$(DEPDIR)/$(am__dirstamp):
+	@$(MKDIR_P) testsuite/$(DEPDIR)
+	@: > testsuite/$(DEPDIR)/$(am__dirstamp)
+testsuite/gentestdlls.$(OBJEXT): testsuite/$(am__dirstamp) \
+	testsuite/$(DEPDIR)/$(am__dirstamp)
+
+testsuite/gentestdlls$(EXEEXT): $(testsuite_gentestdlls_OBJECTS) $(testsuite_gentestdlls_DEPENDENCIES) $(EXTRA_testsuite_gentestdlls_DEPENDENCIES) testsuite/$(am__dirstamp)
+	@rm -f testsuite/gentestdlls$(EXEEXT)
+	$(AM_V_CCLD)$(LINK) $(testsuite_gentestdlls_OBJECTS) $(testsuite_gentestdlls_LDADD) $(LIBS)
 mcparse.h: mcparse.c
 	@if test ! -f $@; then rm -f mcparse.c; else :; fi
 	@if test ! -f $@; then $(MAKE) $(AM_MAKEFLAGS) mcparse.c; else :; fi
@@ -992,6 +1012,7 @@ uninstall-binSCRIPTS:
 
 mostlyclean-compile:
 	-rm -f *.$(OBJEXT)
+	-rm -f testsuite/*.$(OBJEXT)
 
 distclean-compile:
 	-rm -f *.tab.c
@@ -1057,24 +1078,28 @@ distclean-compile:
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/windres.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/winduni.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/wrstabs.Po@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@testsuite/$(DEPDIR)/gentestdlls.Po@am__quote@
 
 .c.o:
-@am__fastdepCC_TRUE@	$(AM_V_CC)$(COMPILE) -MT $@ -MD -MP -MF $(DEPDIR)/$*.Tpo -c -o $@ $<
-@am__fastdepCC_TRUE@	$(AM_V_at)$(am__mv) $(DEPDIR)/$*.Tpo $(DEPDIR)/$*.Po
+@am__fastdepCC_TRUE@	$(AM_V_CC)depbase=`echo $@ | sed 's|[^/]*$$|$(DEPDIR)/&|;s|\.o$$||'`;\
+@am__fastdepCC_TRUE@	$(COMPILE) -MT $@ -MD -MP -MF $$depbase.Tpo -c -o $@ $< &&\
+@am__fastdepCC_TRUE@	$(am__mv) $$depbase.Tpo $$depbase.Po
 @AMDEP_TRUE@@am__fastdepCC_FALSE@	$(AM_V_CC)source='$<' object='$@' libtool=no @AMDEPBACKSLASH@
 @AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
 @am__fastdepCC_FALSE@	$(AM_V_CC@am__nodep@)$(COMPILE) -c -o $@ $<
 
 .c.obj:
-@am__fastdepCC_TRUE@	$(AM_V_CC)$(COMPILE) -MT $@ -MD -MP -MF $(DEPDIR)/$*.Tpo -c -o $@ `$(CYGPATH_W) '$<'`
-@am__fastdepCC_TRUE@	$(AM_V_at)$(am__mv) $(DEPDIR)/$*.Tpo $(DEPDIR)/$*.Po
+@am__fastdepCC_TRUE@	$(AM_V_CC)depbase=`echo $@ | sed 's|[^/]*$$|$(DEPDIR)/&|;s|\.obj$$||'`;\
+@am__fastdepCC_TRUE@	$(COMPILE) -MT $@ -MD -MP -MF $$depbase.Tpo -c -o $@ `$(CYGPATH_W) '$<'` &&\
+@am__fastdepCC_TRUE@	$(am__mv) $$depbase.Tpo $$depbase.Po
 @AMDEP_TRUE@@am__fastdepCC_FALSE@	$(AM_V_CC)source='$<' object='$@' libtool=no @AMDEPBACKSLASH@
 @AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
 @am__fastdepCC_FALSE@	$(AM_V_CC@am__nodep@)$(COMPILE) -c -o $@ `$(CYGPATH_W) '$<'`
 
 .c.lo:
-@am__fastdepCC_TRUE@	$(AM_V_CC)$(LTCOMPILE) -MT $@ -MD -MP -MF $(DEPDIR)/$*.Tpo -c -o $@ $<
-@am__fastdepCC_TRUE@	$(AM_V_at)$(am__mv) $(DEPDIR)/$*.Tpo $(DEPDIR)/$*.Plo
+@am__fastdepCC_TRUE@	$(AM_V_CC)depbase=`echo $@ | sed 's|[^/]*$$|$(DEPDIR)/&|;s|\.lo$$||'`;\
+@am__fastdepCC_TRUE@	$(LTCOMPILE) -MT $@ -MD -MP -MF $$depbase.Tpo -c -o $@ $< &&\
+@am__fastdepCC_TRUE@	$(am__mv) $$depbase.Tpo $$depbase.Plo
 @AMDEP_TRUE@@am__fastdepCC_FALSE@	$(AM_V_CC)source='$<' object='$@' libtool=yes @AMDEPBACKSLASH@
 @AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
 @am__fastdepCC_FALSE@	$(AM_V_CC@am__nodep@)$(LTCOMPILE) -c -o $@ $<
@@ -1090,6 +1115,7 @@ mostlyclean-libtool:
 
 clean-libtool:
 	-rm -rf .libs _libs
+	-rm -rf testsuite/.libs testsuite/_libs
 
 distclean-libtool:
 	-rm -f libtool config.lt
@@ -1269,6 +1295,8 @@ clean-generic:
 distclean-generic:
 	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
 	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
+	-rm -f testsuite/$(DEPDIR)/$(am__dirstamp)
+	-rm -f testsuite/$(am__dirstamp)
 	-test -z "$(DISTCLEANFILES)" || rm -f $(DISTCLEANFILES)
 
 maintainer-clean-generic:
@@ -1292,7 +1320,7 @@ clean-am: clean-binPROGRAMS clean-generic clean-libtool \
 
 distclean: distclean-recursive
 	-rm -f $(am__CONFIG_DISTCLEAN_FILES)
-	-rm -rf ./$(DEPDIR)
+	-rm -rf ./$(DEPDIR) testsuite/$(DEPDIR)
 	-rm -f Makefile
 distclean-am: clean-am distclean-DEJAGNU distclean-compile \
 	distclean-generic distclean-hdr distclean-libtool \
@@ -1342,7 +1370,7 @@ installcheck-am: installcheck-local
 maintainer-clean: maintainer-clean-recursive
 	-rm -f $(am__CONFIG_DISTCLEAN_FILES)
 	-rm -rf $(top_srcdir)/autom4te.cache
-	-rm -rf ./$(DEPDIR)
+	-rm -rf ./$(DEPDIR) testsuite/$(DEPDIR)
 	-rm -f Makefile
 maintainer-clean-am: distclean-am maintainer-clean-generic
 
diff --git a/binutils/testsuite/binutils-all/objdump.exp b/binutils/testsuite/binutils-all/objdump.exp
index beaf44f..b46fd0a 100644
--- a/binutils/testsuite/binutils-all/objdump.exp
+++ b/binutils/testsuite/binutils-all/objdump.exp
@@ -732,6 +732,49 @@ if {[is_elf_format]} then {
     remote_file host delete $testfile3
 }
 
+# Test objdump on .NET assemblies (PE files)
+
+proc test_objdump_dotnet_assemblies {} {
+    global OBJDUMP
+    global base_dir
+
+    set test "dotnet-assemblies"
+
+    set got [binutils_run "$base_dir/testsuite/gentestdlls" "tmpdir"]
+    set want "wrote dotnet-linux-x86-64.dll"
+    if ![regexp $want $got] then {
+	unsupported "$test"
+    }
+
+    set test "dotnet-assemblies (32-bit)"
+    set want "file format pei-i386"
+    set got [binutils_run $OBJDUMP "-x tmpdir/simple-i386.dll"]
+    if ![regexp $want $got] then {
+	if [regexp "file format not recognized" $got] then {
+	    unsupported $test
+	} else {
+	    fail "$test"
+	}
+    } else {
+	pass $test
+    }
+
+    set test "dotnet-assemblies (64-bit)"
+    set want "file format pei-x86-64"
+    set got [binutils_run $OBJDUMP "-x tmpdir/dotnet-linux-x86-64.dll"]
+    if ![regexp $want $got] then {
+	if [regexp "file format not recognized" $got] then {
+	    unsupported $test
+	} else {
+	    fail "$test"
+	}
+    } else {
+	pass $test
+    }
+}
+
+test_objdump_dotnet_assemblies
+
 # Options which are not tested: -a -D -R -T -x -l --stabs
 # I don't see any generic way to test any of these other than -a.
 # Tests could be written for specific targets, and that should be done
diff --git a/binutils/testsuite/gentestdlls.c b/binutils/testsuite/gentestdlls.c
new file mode 100644
index 0000000..b1463c0
--- /dev/null
+++ b/binutils/testsuite/gentestdlls.c
@@ -0,0 +1,152 @@
+/* Copyright (C) 2019 Free Software Foundation, Inc.
+
+   This file is part of GNU Binutils.
+
+   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.  */
+
+
+/* This file generates a number of DLL (PE/COFF binaries traditionally
+   used on Windows) that we can then utilize in various tests to
+   ensure objdump can parse these file correctly.
+
+   See:
+   https://www.ecma-international.org/publications/files/ECMA-ST/ECMA-335.pdf  */
+
+#include <memory.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+static void
+write_dos_header_and_stub (FILE* file)
+{
+  /* See ECMA-335 II.25.2.1.
+     Instead of lfanew, lets just hardcode the offset of the next byte
+     after this header (0x80).  */
+  char buffer[128] =
+    {
+     0x4d, 0x5a, 0x90, 0x00, 0x03, 0x00, 0x00, 0x00,
+     0x04, 0x00, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0x00,
+     0xb8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+     0x40, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+     0x00, 0x00, 0x00, 0x00, 0x80, 0x00, 0x00, 0x00, /* Last 4 bytes are precomputed lfanew.  */
+     0x0e, 0x1f, 0xba, 0x0e, 0x00, 0xb4, 0x09, 0xcd,
+     0x21, 0xb8, 0x01, 0x4c, 0xcd, 0x21, 0x54, 0x68,
+     0x69, 0x73, 0x20, 0x70, 0x72, 0x6f, 0x67, 0x72,
+     0x61, 0x6d, 0x20, 0x63, 0x61, 0x6e, 0x6e, 0x6f,
+     0x74, 0x20, 0x62, 0x65, 0x20, 0x72, 0x75, 0x6e,
+     0x20, 0x69, 0x6e, 0x20, 0x44, 0x4f, 0x53, 0x20,
+     0x6d, 0x6f, 0x64, 0x65, 0x2e, 0x0d, 0x0d, 0x0a,
+     0x24, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
+    };
+
+  fwrite (buffer, 1, 128, file);
+}
+
+static void
+write_pe_signature (FILE* file)
+{
+  char buffer[4];
+  buffer[0] = 'P';
+  buffer[1] = 'E';
+  buffer[2] = 0;
+  buffer[3] = 0;
+  fwrite (buffer, 1, 4, file);
+}
+
+static void
+write_coff_header (FILE* file, uint16_t machine)
+{
+  char buffer[128];
+
+  memset (buffer, 0, sizeof (buffer));
+
+  /* Machine.  ECMA-335 says this must be 0x14c but that's not true anymore.  */
+  buffer[0] = machine & 0xff;
+  buffer[1] = machine >> 0x8;
+  fwrite (buffer, 2, 1, file);
+  memset (buffer, 0, sizeof (buffer));
+  /* NumberOfSections = 0 */
+  fwrite (buffer, 2, 1, file);
+  /* TimeDateStamp = 0 */
+  fwrite (buffer, 4, 1, file);
+  /* PointerToSymbolTable = 0 */
+  fwrite (buffer, 4, 1, file);
+  /* NumberOfSymbols = 0 */
+  fwrite (buffer, 4, 1, file);
+  /* OptionalHeaderSize = 0 */
+  fwrite (buffer, 2, 1, file);
+  /* Characteristics = 0x2000 */
+  buffer[0] = 0x00;
+  buffer[1] = 0x20;
+  fwrite (buffer, 2, 1, file);
+  memset (buffer, 0 , sizeof (buffer));
+}
+
+int
+main (int argc, char** argv)
+{
+  FILE* file;
+
+  if (argc < 2)
+    {
+      fprintf (stderr, "usage: %s output-directory\n", argv[0]);
+      exit (2);
+    }
+  if (chdir (argv[1]) != 0)
+    {
+      fprintf (stderr, "error: unable to change directory to %s\n", argv[0]);
+      exit (2);
+    }
+
+  /* Generate a simple DLL file.  */
+  file = fopen ("simple-i386.dll", "w");
+  if (file == NULL)
+    {
+      fprintf (stderr, "error: unable to open file for writing\n");
+      exit (1);
+    }
+
+  write_dos_header_and_stub (file);
+  write_pe_signature (file);
+  write_coff_header (file, 0x14c);
+  fclose (file);
+  printf ("wrote simple-i386.dll\n");
+
+  /* Generate a sample .NET Core on Linux dll file.  As opposed to the
+     more common DLLs that contain bytecode (CIL/MSIL), many .NET Core
+     DLLs are pre-compiled for specific architectures and platforms.
+     See https://github.com/jbevain/cecil/issues/337 for an example of
+     this value being used in practice.  */
+  file = fopen ("dotnet-linux-x86-64.dll", "w");
+  if (file == NULL)
+    {
+      fprintf (stderr, "error: unable to open file for writing\n");
+      exit (1);
+    }
+
+  write_dos_header_and_stub (file);
+  write_pe_signature (file);
+  write_coff_header (file, 0xfd1d /* x86-64 + Linux */);
+  fclose (file);
+  printf ("wrote dotnet-linux-x86-64.dll\n");
+
+  return 0;
+}