From 67faeb7d58e0d25a50d36788ed49ed383b92e090 Mon Sep 17 00:00:00 2001
From: Efraim Flashner <efraim@flashner.co.il>
Date: Mon, 26 Mar 2018 11:08:17 +0300
Subject: [PATCH] add ARMv7 support

---
 src/arch/arm.h                           |  75 +++++-
 src/os/linux/arm/Makefile.am             |   9 +-
 src/os/linux/arm/Makefile.in             | 166 ++++++++----
 src/os/linux/arm/callNative.S            |  12 +-
 src/os/linux/arm/callNativeEABI.S        |   8 +-
 src/os/linux/arm/callNativeEABIHard.S    | 315 +++++++++++++++++++++++
 src/os/linux/arm/callNativeEABIHardARM.S | 266 +++++++++++++++++++
 src/os/linux/arm/dll_md.c                |  61 ++++-
 8 files changed, 843 insertions(+), 69 deletions(-)
 create mode 100644 src/os/linux/arm/callNativeEABIHard.S
 create mode 100644 src/os/linux/arm/callNativeEABIHardARM.S

diff --git a/src/arch/arm.h b/src/arch/arm.h
index ccf68c4..d2c0318 100644
--- a/src/arch/arm.h
+++ b/src/arch/arm.h
@@ -1,6 +1,6 @@
 /*
- * Copyright (C) 2003, 2004, 2005, 2006, 2007
- * Robert Lougher <rob@lougher.org.uk>.
+ * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012,
+ * 2014 Robert Lougher <rob@jamvm.org.uk>.
  *
  * This file is part of JamVM.
  *
@@ -21,10 +21,16 @@
 
 #define OS_ARCH "arm"
 
-/* Override default min and max heap sizes.  ARM machines are
-   usually embedded, and the standard defaults are too large. */
-#define DEFAULT_MAX_HEAP 16*MB
+/* Override minimum min heap size.  The initial heap size is a ratio
+   of the physical memory, but it must be at least the minimum min
+   size.  The normal setting is too large for ARM machines as they
+   are usually embedded. */
+#define MIN_MIN_HEAP 1*MB
+
+/* Likewise, override the default min/max heap sizes used when the
+   size of physical memory is not available */
 #define DEFAULT_MIN_HEAP 1*MB
+#define DEFAULT_MAX_HEAP 64*MB
 
 #ifdef DIRECT
 #define HANDLER_TABLE_T static const void
@@ -51,6 +57,36 @@
 /* Needed for i386 -- empty here */
 #define FPU_HACK
 
+#if defined(__ARM_ARCH_6__) || defined(__ARM_ARCH_7A__)
+#define COMPARE_AND_SWAP_32(addr, old_val, new_val)       \
+({                                                        \
+    int result, read_val;                                 \
+    __asm__ __volatile__ ("                               \
+        1:      mov %0, #0;                               \
+                ldrex %1, [%2];                           \
+                cmp %3, %1;                               \
+                bne 2f;                                   \
+                strex %0, %4, [%2];                       \
+                cmp %0, #1;                               \
+                beq 1b;                                   \
+                mov %0, #1;                               \
+        2:"                                               \
+    : "=&r" (result), "=&r" (read_val)                    \
+    : "r" (addr), "r" (old_val), "r" (new_val)            \
+    : "cc", "memory");                                    \
+    result;                                               \
+})
+
+#define COMPARE_AND_SWAP(addr, old_val, new_val)          \
+        COMPARE_AND_SWAP_32(addr, old_val, new_val)
+
+#define LOCKWORD_READ(addr) *addr
+#define LOCKWORD_WRITE(addr, value) *addr = value
+#define LOCKWORD_COMPARE_AND_SWAP(addr, old_val, new_val) \
+        COMPARE_AND_SWAP(addr, old_val, new_val)
+
+#else
+
 #define LOCKWORD_COMPARE_AND_SWAP(addr, old_val, new_val) \
 ({                                                        \
     int result, read_val;                                 \
@@ -94,7 +130,7 @@ do {                                                      \
     : "r" (addr), "r" (new_val)                           \
     : "cc", "memory");                                    \
 } while(0)
-
+#endif
 
 #ifdef __ARM_EABI__
 #define FLUSH_CACHE(addr, length)                         \
@@ -124,8 +160,33 @@ do {                                                      \
 }
 #endif
 
+#define GEN_REL_JMP(target_addr, patch_addr, patch_size)  \
+({                                                        \
+    int patched = FALSE;                                  \
+                                                          \
+    if(patch_size >= 4) {                                 \
+        /* Guard against the pointer difference being     \
+           larger than the signed range */                \
+        long long offset = (uintptr_t)(target_addr) -     \
+                           (uintptr_t)(patch_addr) - 8;   \
+                                                          \
+        if(offset >= -1<<25 && offset < 1<<25) {          \
+            *(int*)(patch_addr) = offset>>2 & 0x00ffffff  \
+                                            | 0xea000000; \
+            patched = TRUE;                               \
+        }                                                 \
+    }                                                     \
+    patched;                                              \
+})
+
+#ifdef __ARM_ARCH_7A__
+#define MBARRIER() __asm__ __volatile__ ("dmb" ::: "memory")
+#define UNLOCK_MBARRIER() __asm__ __volatile__ ("dmb" ::: "memory")
+#define JMM_LOCK_MBARRIER() __asm__ __volatile__ ("dmb" ::: "memory")
+#define JMM_UNLOCK_MBARRIER() __asm__ __volatile__ ("dmb" ::: "memory")
+#else
 #define MBARRIER() __asm__ __volatile__ ("" ::: "memory")
 #define UNLOCK_MBARRIER() __asm__ __volatile__ ("" ::: "memory")
 #define JMM_LOCK_MBARRIER() __asm__ __volatile__ ("" ::: "memory")
 #define JMM_UNLOCK_MBARRIER() __asm__ __volatile__ ("" ::: "memory")
-
+#endif
diff --git a/src/os/linux/arm/Makefile.am b/src/os/linux/arm/Makefile.am
index d18ea5a..74e7786 100644
--- a/src/os/linux/arm/Makefile.am
+++ b/src/os/linux/arm/Makefile.am
@@ -1,6 +1,6 @@
 ##
-## Copyright (C) 2003, 2004, 2005, 2006, 2007
-## Robert Lougher <rob@lougher.org.uk>.
+## Copyright (C) 2003, 2004, 2005, 2006, 2007, 2010, 2011, 2012
+## Robert Lougher <rob@jamvm.org.uk>.
 ##
 ## This file is part of JamVM.
 ##
@@ -19,10 +19,11 @@
 ## Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 ##
 
-EXTRA_DIST = callNativeOABI.S callNativeEABI.S
+EXTRA_DIST = callNativeOABI.S callNativeEABI.S callNativeEABIHard.S \
+             callNativeEABIHardARM.S
 
 noinst_LTLIBRARIES = libnative.la
 libnative_la_SOURCES = init.c dll_md.c callNative.S
 
-AM_CPPFLAGS = -I$(top_builddir)/src
+AM_CPPFLAGS = -I$(top_builddir)/src -I$(top_srcdir)/src
 AM_CCASFLAGS = -I$(top_builddir)/src
diff --git a/src/os/linux/arm/Makefile.in b/src/os/linux/arm/Makefile.in
index 63b21ad..6d44ea9 100644
--- a/src/os/linux/arm/Makefile.in
+++ b/src/os/linux/arm/Makefile.in
@@ -1,8 +1,9 @@
-# Makefile.in generated by automake 1.10 from Makefile.am.
+# Makefile.in generated by automake 1.11.6 from Makefile.am.
 # @configure_input@
 
 # Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002,
-# 2003, 2004, 2005, 2006  Free Software Foundation, Inc.
+# 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Free Software
+# Foundation, Inc.
 # This Makefile.in is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
 # with or without modifications, as long as this notice is preserved.
@@ -15,9 +16,27 @@
 @SET_MAKE@
 
 VPATH = @srcdir@
+am__make_dryrun = \
+  { \
+    am__dry=no; \
+    case $$MAKEFLAGS in \
+      *\\[\ \	]*) \
+        echo 'am--echo: ; @echo "AM"  OK' | $(MAKE) -f - 2>/dev/null \
+          | grep '^AM OK$$' >/dev/null || am__dry=yes;; \
+      *) \
+        for am__flg in $$MAKEFLAGS; do \
+          case $$am__flg in \
+            *=*|--*) ;; \
+            *n*) am__dry=yes; break;; \
+          esac; \
+        done;; \
+    esac; \
+    test $$am__dry = yes; \
+  }
 pkgdatadir = $(datadir)/@PACKAGE@
-pkglibdir = $(libdir)/@PACKAGE@
 pkgincludedir = $(includedir)/@PACKAGE@
+pkglibdir = $(libdir)/@PACKAGE@
+pkglibexecdir = $(libexecdir)/@PACKAGE@
 am__cd = CDPATH="$${ZSH_VERSION+.}$(PATH_SEPARATOR)" && cd
 install_sh_DATA = $(install_sh) -c -m 644
 install_sh_PROGRAM = $(install_sh) -c
@@ -42,13 +61,15 @@ am__configure_deps = $(am__aclocal_m4_deps) $(CONFIGURE_DEPENDENCIES) \
 mkinstalldirs = $(SHELL) $(top_srcdir)/mkinstalldirs
 CONFIG_HEADER = $(top_builddir)/src/config.h
 CONFIG_CLEAN_FILES =
+CONFIG_CLEAN_VPATH_FILES =
 LTLIBRARIES = $(noinst_LTLIBRARIES)
 libnative_la_LIBADD =
 am_libnative_la_OBJECTS = init.lo dll_md.lo callNative.lo
 libnative_la_OBJECTS = $(am_libnative_la_OBJECTS)
-DEFAULT_INCLUDES = -I. -I$(top_builddir)/src@am__isrc@
+DEFAULT_INCLUDES = -I.@am__isrc@ -I$(top_builddir)/src
 depcomp = $(SHELL) $(top_srcdir)/depcomp
 am__depfiles_maybe = depfiles
+am__mv = mv -f
 CPPASCOMPILE = $(CCAS) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) \
 	$(AM_CPPFLAGS) $(CPPFLAGS) $(AM_CCASFLAGS) $(CCASFLAGS)
 LTCPPASCOMPILE = $(LIBTOOL) $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) \
@@ -65,6 +86,11 @@ LINK = $(LIBTOOL) --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) \
 	$(LDFLAGS) -o $@
 SOURCES = $(libnative_la_SOURCES)
 DIST_SOURCES = $(libnative_la_SOURCES)
+am__can_run_installinfo = \
+  case $$AM_UPDATE_INFO_DIR in \
+    n|no|NO) false;; \
+    *) (install-info --version) >/dev/null 2>&1;; \
+  esac
 ETAGS = etags
 CTAGS = ctags
 DISTFILES = $(DIST_COMMON) $(DIST_SOURCES) $(TEXINFOS) $(EXTRA_DIST)
@@ -84,21 +110,18 @@ CCDEPMODE = @CCDEPMODE@
 CFLAGS = @CFLAGS@
 CPP = @CPP@
 CPPFLAGS = @CPPFLAGS@
-CXX = @CXX@
-CXXCPP = @CXXCPP@
-CXXDEPMODE = @CXXDEPMODE@
-CXXFLAGS = @CXXFLAGS@
 CYGPATH_W = @CYGPATH_W@
 DEFS = @DEFS@
 DEPDIR = @DEPDIR@
-ECHO = @ECHO@
+DLLTOOL = @DLLTOOL@
+DSYMUTIL = @DSYMUTIL@
+DUMPBIN = @DUMPBIN@
 ECHO_C = @ECHO_C@
 ECHO_N = @ECHO_N@
 ECHO_T = @ECHO_T@
 EGREP = @EGREP@
 EXEEXT = @EXEEXT@
-F77 = @F77@
-FFLAGS = @FFLAGS@
+FGREP = @FGREP@
 GREP = @GREP@
 INSTALL = @INSTALL@
 INSTALL_DATA = @INSTALL_DATA@
@@ -106,21 +129,30 @@ INSTALL_PROGRAM = @INSTALL_PROGRAM@
 INSTALL_SCRIPT = @INSTALL_SCRIPT@
 INSTALL_STRIP_PROGRAM = @INSTALL_STRIP_PROGRAM@
 JAVAC = @JAVAC@
+LD = @LD@
 LDFLAGS = @LDFLAGS@
 LIBOBJS = @LIBOBJS@
 LIBS = @LIBS@
 LIBTOOL = @LIBTOOL@
+LIPO = @LIPO@
 LN_S = @LN_S@
 LTLIBOBJS = @LTLIBOBJS@
 MAINT = @MAINT@
 MAKEINFO = @MAKEINFO@
+MANIFEST_TOOL = @MANIFEST_TOOL@
 MKDIR_P = @MKDIR_P@
+NM = @NM@
+NMEDIT = @NMEDIT@
+OBJDUMP = @OBJDUMP@
 OBJEXT = @OBJEXT@
+OTOOL = @OTOOL@
+OTOOL64 = @OTOOL64@
 PACKAGE = @PACKAGE@
 PACKAGE_BUGREPORT = @PACKAGE_BUGREPORT@
 PACKAGE_NAME = @PACKAGE_NAME@
 PACKAGE_STRING = @PACKAGE_STRING@
 PACKAGE_TARNAME = @PACKAGE_TARNAME@
+PACKAGE_URL = @PACKAGE_URL@
 PACKAGE_VERSION = @PACKAGE_VERSION@
 PATH_SEPARATOR = @PATH_SEPARATOR@
 RANLIB = @RANLIB@
@@ -133,9 +165,9 @@ abs_builddir = @abs_builddir@
 abs_srcdir = @abs_srcdir@
 abs_top_builddir = @abs_top_builddir@
 abs_top_srcdir = @abs_top_srcdir@
+ac_ct_AR = @ac_ct_AR@
 ac_ct_CC = @ac_ct_CC@
-ac_ct_CXX = @ac_ct_CXX@
-ac_ct_F77 = @ac_ct_F77@
+ac_ct_DUMPBIN = @ac_ct_DUMPBIN@
 am__include = @am__include@
 am__leading_dot = @am__leading_dot@
 am__quote = @am__quote@
@@ -149,6 +181,7 @@ build_cpu = @build_cpu@
 build_os = @build_os@
 build_vendor = @build_vendor@
 builddir = @builddir@
+classlib = @classlib@
 datadir = @datadir@
 datarootdir = @datarootdir@
 docdir = @docdir@
@@ -181,15 +214,18 @@ sharedstatedir = @sharedstatedir@
 srcdir = @srcdir@
 sysconfdir = @sysconfdir@
 target_alias = @target_alias@
+top_build_prefix = @top_build_prefix@
 top_builddir = @top_builddir@
 top_srcdir = @top_srcdir@
 use_zip_no = @use_zip_no@
 use_zip_yes = @use_zip_yes@
 with_classpath_install_dir = @with_classpath_install_dir@
-EXTRA_DIST = callNativeOABI.S callNativeEABI.S
+EXTRA_DIST = callNativeOABI.S callNativeEABI.S callNativeEABIHard.S \
+             callNativeEABIHardARM.S
+
 noinst_LTLIBRARIES = libnative.la
 libnative_la_SOURCES = init.c dll_md.c callNative.S
-AM_CPPFLAGS = -I$(top_builddir)/src
+AM_CPPFLAGS = -I$(top_builddir)/src -I$(top_srcdir)/src
 AM_CCASFLAGS = -I$(top_builddir)/src
 all: all-am
 
@@ -199,14 +235,14 @@ $(srcdir)/Makefile.in: @MAINTAINER_MODE_TRUE@ $(srcdir)/Makefile.am  $(am__confi
 	@for dep in $?; do \
 	  case '$(am__configure_deps)' in \
 	    *$$dep*) \
-	      cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh \
-		&& exit 0; \
+	      ( cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh ) \
+	        && { if test -f $@; then exit 0; else break; fi; }; \
 	      exit 1;; \
 	  esac; \
 	done; \
-	echo ' cd $(top_srcdir) && $(AUTOMAKE) --gnu  src/os/linux/arm/Makefile'; \
-	cd $(top_srcdir) && \
-	  $(AUTOMAKE) --gnu  src/os/linux/arm/Makefile
+	echo ' cd $(top_srcdir) && $(AUTOMAKE) --gnu src/os/linux/arm/Makefile'; \
+	$(am__cd) $(top_srcdir) && \
+	  $(AUTOMAKE) --gnu src/os/linux/arm/Makefile
 .PRECIOUS: Makefile
 Makefile: $(srcdir)/Makefile.in $(top_builddir)/config.status
 	@case '$?' in \
@@ -224,6 +260,7 @@ $(top_srcdir)/configure: @MAINTAINER_MODE_TRUE@ $(am__configure_deps)
 	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
 $(ACLOCAL_M4): @MAINTAINER_MODE_TRUE@ $(am__aclocal_m4_deps)
 	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
+$(am__aclocal_m4_deps):
 
 clean-noinstLTLIBRARIES:
 	-test -z "$(noinst_LTLIBRARIES)" || rm -f $(noinst_LTLIBRARIES)
@@ -233,7 +270,7 @@ clean-noinstLTLIBRARIES:
 	  echo "rm -f \"$${dir}/so_locations\""; \
 	  rm -f "$${dir}/so_locations"; \
 	done
-libnative.la: $(libnative_la_OBJECTS) $(libnative_la_DEPENDENCIES) 
+libnative.la: $(libnative_la_OBJECTS) $(libnative_la_DEPENDENCIES) $(EXTRA_libnative_la_DEPENDENCIES) 
 	$(LINK)  $(libnative_la_OBJECTS) $(libnative_la_LIBADD) $(LIBS)
 
 mostlyclean-compile:
@@ -248,42 +285,42 @@ distclean-compile:
 
 .S.o:
 @am__fastdepCCAS_TRUE@	$(CPPASCOMPILE) -MT $@ -MD -MP -MF $(DEPDIR)/$*.Tpo -c -o $@ $<
-@am__fastdepCCAS_TRUE@	mv -f $(DEPDIR)/$*.Tpo $(DEPDIR)/$*.Po
+@am__fastdepCCAS_TRUE@	$(am__mv) $(DEPDIR)/$*.Tpo $(DEPDIR)/$*.Po
 @AMDEP_TRUE@@am__fastdepCCAS_FALSE@	source='$<' object='$@' libtool=no @AMDEPBACKSLASH@
 @AMDEP_TRUE@@am__fastdepCCAS_FALSE@	DEPDIR=$(DEPDIR) $(CCASDEPMODE) $(depcomp) @AMDEPBACKSLASH@
 @am__fastdepCCAS_FALSE@	$(CPPASCOMPILE) -c -o $@ $<
 
 .S.obj:
 @am__fastdepCCAS_TRUE@	$(CPPASCOMPILE) -MT $@ -MD -MP -MF $(DEPDIR)/$*.Tpo -c -o $@ `$(CYGPATH_W) '$<'`
-@am__fastdepCCAS_TRUE@	mv -f $(DEPDIR)/$*.Tpo $(DEPDIR)/$*.Po
+@am__fastdepCCAS_TRUE@	$(am__mv) $(DEPDIR)/$*.Tpo $(DEPDIR)/$*.Po
 @AMDEP_TRUE@@am__fastdepCCAS_FALSE@	source='$<' object='$@' libtool=no @AMDEPBACKSLASH@
 @AMDEP_TRUE@@am__fastdepCCAS_FALSE@	DEPDIR=$(DEPDIR) $(CCASDEPMODE) $(depcomp) @AMDEPBACKSLASH@
 @am__fastdepCCAS_FALSE@	$(CPPASCOMPILE) -c -o $@ `$(CYGPATH_W) '$<'`
 
 .S.lo:
 @am__fastdepCCAS_TRUE@	$(LTCPPASCOMPILE) -MT $@ -MD -MP -MF $(DEPDIR)/$*.Tpo -c -o $@ $<
-@am__fastdepCCAS_TRUE@	mv -f $(DEPDIR)/$*.Tpo $(DEPDIR)/$*.Plo
+@am__fastdepCCAS_TRUE@	$(am__mv) $(DEPDIR)/$*.Tpo $(DEPDIR)/$*.Plo
 @AMDEP_TRUE@@am__fastdepCCAS_FALSE@	source='$<' object='$@' libtool=yes @AMDEPBACKSLASH@
 @AMDEP_TRUE@@am__fastdepCCAS_FALSE@	DEPDIR=$(DEPDIR) $(CCASDEPMODE) $(depcomp) @AMDEPBACKSLASH@
 @am__fastdepCCAS_FALSE@	$(LTCPPASCOMPILE) -c -o $@ $<
 
 .c.o:
 @am__fastdepCC_TRUE@	$(COMPILE) -MT $@ -MD -MP -MF $(DEPDIR)/$*.Tpo -c -o $@ $<
-@am__fastdepCC_TRUE@	mv -f $(DEPDIR)/$*.Tpo $(DEPDIR)/$*.Po
+@am__fastdepCC_TRUE@	$(am__mv) $(DEPDIR)/$*.Tpo $(DEPDIR)/$*.Po
 @AMDEP_TRUE@@am__fastdepCC_FALSE@	source='$<' object='$@' libtool=no @AMDEPBACKSLASH@
 @AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
 @am__fastdepCC_FALSE@	$(COMPILE) -c $<
 
 .c.obj:
 @am__fastdepCC_TRUE@	$(COMPILE) -MT $@ -MD -MP -MF $(DEPDIR)/$*.Tpo -c -o $@ `$(CYGPATH_W) '$<'`
-@am__fastdepCC_TRUE@	mv -f $(DEPDIR)/$*.Tpo $(DEPDIR)/$*.Po
+@am__fastdepCC_TRUE@	$(am__mv) $(DEPDIR)/$*.Tpo $(DEPDIR)/$*.Po
 @AMDEP_TRUE@@am__fastdepCC_FALSE@	source='$<' object='$@' libtool=no @AMDEPBACKSLASH@
 @AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
 @am__fastdepCC_FALSE@	$(COMPILE) -c `$(CYGPATH_W) '$<'`
 
 .c.lo:
 @am__fastdepCC_TRUE@	$(LTCOMPILE) -MT $@ -MD -MP -MF $(DEPDIR)/$*.Tpo -c -o $@ $<
-@am__fastdepCC_TRUE@	mv -f $(DEPDIR)/$*.Tpo $(DEPDIR)/$*.Plo
+@am__fastdepCC_TRUE@	$(am__mv) $(DEPDIR)/$*.Tpo $(DEPDIR)/$*.Plo
 @AMDEP_TRUE@@am__fastdepCC_FALSE@	source='$<' object='$@' libtool=yes @AMDEPBACKSLASH@
 @AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
 @am__fastdepCC_FALSE@	$(LTCOMPILE) -c -o $@ $<
@@ -299,45 +336,49 @@ ID: $(HEADERS) $(SOURCES) $(LISP) $(TAGS_FILES)
 	unique=`for i in $$list; do \
 	    if test -f "$$i"; then echo $$i; else echo $(srcdir)/$$i; fi; \
 	  done | \
-	  $(AWK) '    { files[$$0] = 1; } \
-	       END { for (i in files) print i; }'`; \
+	  $(AWK) '{ files[$$0] = 1; nonempty = 1; } \
+	      END { if (nonempty) { for (i in files) print i; }; }'`; \
 	mkid -fID $$unique
 tags: TAGS
 
 TAGS:  $(HEADERS) $(SOURCES)  $(TAGS_DEPENDENCIES) \
 		$(TAGS_FILES) $(LISP)
-	tags=; \
+	set x; \
 	here=`pwd`; \
 	list='$(SOURCES) $(HEADERS)  $(LISP) $(TAGS_FILES)'; \
 	unique=`for i in $$list; do \
 	    if test -f "$$i"; then echo $$i; else echo $(srcdir)/$$i; fi; \
 	  done | \
-	  $(AWK) '    { files[$$0] = 1; } \
-	       END { for (i in files) print i; }'`; \
-	if test -z "$(ETAGS_ARGS)$$tags$$unique"; then :; else \
+	  $(AWK) '{ files[$$0] = 1; nonempty = 1; } \
+	      END { if (nonempty) { for (i in files) print i; }; }'`; \
+	shift; \
+	if test -z "$(ETAGS_ARGS)$$*$$unique"; then :; else \
 	  test -n "$$unique" || unique=$$empty_fix; \
-	  $(ETAGS) $(ETAGSFLAGS) $(AM_ETAGSFLAGS) $(ETAGS_ARGS) \
-	    $$tags $$unique; \
+	  if test $$# -gt 0; then \
+	    $(ETAGS) $(ETAGSFLAGS) $(AM_ETAGSFLAGS) $(ETAGS_ARGS) \
+	      "$$@" $$unique; \
+	  else \
+	    $(ETAGS) $(ETAGSFLAGS) $(AM_ETAGSFLAGS) $(ETAGS_ARGS) \
+	      $$unique; \
+	  fi; \
 	fi
 ctags: CTAGS
 CTAGS:  $(HEADERS) $(SOURCES)  $(TAGS_DEPENDENCIES) \
 		$(TAGS_FILES) $(LISP)
-	tags=; \
-	here=`pwd`; \
 	list='$(SOURCES) $(HEADERS)  $(LISP) $(TAGS_FILES)'; \
 	unique=`for i in $$list; do \
 	    if test -f "$$i"; then echo $$i; else echo $(srcdir)/$$i; fi; \
 	  done | \
-	  $(AWK) '    { files[$$0] = 1; } \
-	       END { for (i in files) print i; }'`; \
-	test -z "$(CTAGS_ARGS)$$tags$$unique" \
+	  $(AWK) '{ files[$$0] = 1; nonempty = 1; } \
+	      END { if (nonempty) { for (i in files) print i; }; }'`; \
+	test -z "$(CTAGS_ARGS)$$unique" \
 	  || $(CTAGS) $(CTAGSFLAGS) $(AM_CTAGSFLAGS) $(CTAGS_ARGS) \
-	     $$tags $$unique
+	     $$unique
 
 GTAGS:
 	here=`$(am__cd) $(top_builddir) && pwd` \
-	  && cd $(top_srcdir) \
-	  && gtags -i $(GTAGS_ARGS) $$here
+	  && $(am__cd) $(top_srcdir) \
+	  && gtags -i $(GTAGS_ARGS) "$$here"
 
 distclean-tags:
 	-rm -f TAGS ID GTAGS GRTAGS GSYMS GPATH tags
@@ -358,13 +399,17 @@ distdir: $(DISTFILES)
 	  if test -f $$file || test -d $$file; then d=.; else d=$(srcdir); fi; \
 	  if test -d $$d/$$file; then \
 	    dir=`echo "/$$file" | sed -e 's,/[^/]*$$,,'`; \
+	    if test -d "$(distdir)/$$file"; then \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
 	    if test -d $(srcdir)/$$file && test $$d != $(srcdir); then \
-	      cp -pR $(srcdir)/$$file $(distdir)$$dir || exit 1; \
+	      cp -fpR $(srcdir)/$$file "$(distdir)$$dir" || exit 1; \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
 	    fi; \
-	    cp -pR $$d/$$file $(distdir)$$dir || exit 1; \
+	    cp -fpR $$d/$$file "$(distdir)$$dir" || exit 1; \
 	  else \
-	    test -f $(distdir)/$$file \
-	    || cp -p $$d/$$file $(distdir)/$$file \
+	    test -f "$(distdir)/$$file" \
+	    || cp -p $$d/$$file "$(distdir)/$$file" \
 	    || exit 1; \
 	  fi; \
 	done
@@ -382,16 +427,22 @@ install-am: all-am
 
 installcheck: installcheck-am
 install-strip:
-	$(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
-	  install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
-	  `test -z '$(STRIP)' || \
-	    echo "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'"` install
+	if test -z '$(STRIP)'; then \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	      install; \
+	else \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	    "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'" install; \
+	fi
 mostlyclean-generic:
 
 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)
 
 maintainer-clean-generic:
 	@echo "This command is intended for maintainers to use"
@@ -413,6 +464,8 @@ dvi-am:
 
 html: html-am
 
+html-am:
+
 info: info-am
 
 info-am:
@@ -421,18 +474,28 @@ install-data-am:
 
 install-dvi: install-dvi-am
 
+install-dvi-am:
+
 install-exec-am:
 
 install-html: install-html-am
 
+install-html-am:
+
 install-info: install-info-am
 
+install-info-am:
+
 install-man:
 
 install-pdf: install-pdf-am
 
+install-pdf-am:
+
 install-ps: install-ps-am
 
+install-ps-am:
+
 installcheck-am:
 
 maintainer-clean: maintainer-clean-am
@@ -470,6 +533,7 @@ uninstall-am:
 	mostlyclean-compile mostlyclean-generic mostlyclean-libtool \
 	pdf pdf-am ps ps-am tags uninstall uninstall-am
 
+
 # Tell versions [3.59,3.63) of GNU make to not export all variables.
 # Otherwise a system limit (for SysV at least) may be exceeded.
 .NOEXPORT:
diff --git a/src/os/linux/arm/callNative.S b/src/os/linux/arm/callNative.S
index 39ab6d3..245afd1 100644
--- a/src/os/linux/arm/callNative.S
+++ b/src/os/linux/arm/callNative.S
@@ -1,6 +1,6 @@
 /*
- * Copyright (C) 2003, 2004, 2005, 2006, 2007
- * Robert Lougher <rob@lougher.org.uk>.
+ * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2011, 2012
+ * Robert Lougher <rob@jamvm.org.uk>.
  *
  * This file is part of JamVM.
  *
@@ -23,7 +23,15 @@
 
 #ifndef USE_FFI
 #ifdef __ARM_EABI__
+#ifdef __ARM_PCS_VFP
+#ifdef __ARM_ARCH_7A__
+#include "callNativeEABIHard.S"
+#else
+#include "callNativeEABIHardARM.S"
+#endif
+#else
 #include "callNativeEABI.S"
+#endif
 #else
 #include "callNativeOABI.S"
 #endif
diff --git a/src/os/linux/arm/callNativeEABI.S b/src/os/linux/arm/callNativeEABI.S
index 5effa57..3a7539e 100644
--- a/src/os/linux/arm/callNativeEABI.S
+++ b/src/os/linux/arm/callNativeEABI.S
@@ -1,6 +1,6 @@
 /*
- * Copyright (C) 2003, 2004, 2005, 2006, 2007
- * Robert Lougher <rob@lougher.org.uk>.
+ * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2011
+ * Robert Lougher <rob@jamvm.org.uk>.
  *
  * This file is part of JamVM.
  *
@@ -95,8 +95,12 @@ done:
         ldmfd   sp!, {r2, r3}
 
         /* Call the function */
+#if defined(__ARM_ARCH_4__) || defined(__ARM_ARCH_4T__)
         mov     lr, pc
         bx      ip
+#else
+        blx     ip
+#endif
 
         subs    r4, r4, #8              /* Pop argument area */
                                         /* (minus 8 for r2/r3) */
diff --git a/src/os/linux/arm/callNativeEABIHard.S b/src/os/linux/arm/callNativeEABIHard.S
new file mode 100644
index 0000000..5d5785b
--- /dev/null
+++ b/src/os/linux/arm/callNativeEABIHard.S
@@ -0,0 +1,315 @@
+/*
+ * Copyright (C) 2011, 2012 Robert Lougher <rob@jamvm.org.uk>.
+ *
+ * This file is part of JamVM.
+ *
+ * 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 2,
+ * 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, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+        .text
+        .syntax unified
+        .arch armv7-a
+        .thumb
+        .align  2
+        .global callJNIMethod
+        .type   callJNIMethod,function
+
+/*
+ * Arguments passed in:
+ *
+ * r0 JNIEnv
+ * r1 class or NULL
+ * r2 sig
+ * r3 extra arg
+ * sp + 0 ostack
+ * sp + 4 function pntr
+ * sp + 8 args count
+ */
+
+/* Register usage :
+ *
+ * r11 function pntr
+ * lr ostack pntr
+ * ip args pntr
+ * r8 sig pntr
+ * r10 extra stack
+ * r6 fp backfill 
+ * r4 fp reg
+ * r7 int reg
+ * r5 scratch
+ * r3, r2 outgoing int args
+ * r1 outgoing class or this pntr
+ * r0 outgoing JNIEnv (as passed in)
+ *
+ * s0 - s16 (d0 - d7) outgoing float args
+ */
+
+callJNIMethod:
+        stmfd   sp!, {r4, r5, r6, r7, r8, r10, r11, lr}
+        ldr     lr, [sp, #32]           /* get ostack pntr */
+        ldr     r11, [sp, #36]          /* get function pntr */
+
+        cmp     r1, #0                  /* is method non-static? */
+        it      eq
+        ldreq   r1, [lr], #4            /* yes, load r1 with "this" */
+
+        mov     r10, r3
+        subs    sp, sp, r3              /* allocate room for stacked */
+        add     r8, r2, #1              /* init sig pntr -- skipping '(' */
+
+        mov     ip, sp                  /* init loop pntr */
+
+        mov     r7, #2
+        mov     r4, #16
+        mov     r6, #0
+
+scan_sig:
+        ldrb    r5, [r8], #1
+
+        cmp     r5, #41                 /* ')' */
+        beq     done
+
+        cmp     r5, #70                 /* 'F' */
+        beq     float
+
+        cmp     r5, #68                 /* 'D' */
+        beq     double
+
+        cmp     r5, #74                 /* 'J' */
+        beq     long
+
+skip_brackets:
+        cmp     r5, #91                 /* '[' */
+        itt     eq
+        ldrbeq  r5, [r8], #1
+        beq     skip_brackets
+
+        cmp     r5, #76                 /* 'L' */
+        bne     int
+
+skip_ref:
+        ldrb    r5, [r8], #1
+        cmp     r5, #59                 /* ';' */
+        bne     skip_ref
+
+int:
+        cbz     r7, stack_int
+
+        subs    r7, r7, #1
+        ite     ne
+        ldrne   r2, [lr], #4
+        ldreq   r3, [lr], #4
+
+        b       scan_sig
+
+float:
+        cbz     r6, no_backfill
+
+        sub     r5, r6, #1
+        mov     r6, #0
+        b       load_float
+
+no_backfill:
+        cbz     r4, stack_int
+        
+        sub     r4, r4, #1
+        mov     r5, r4
+
+load_float:
+        add     lr, lr, #4
+        tbb     [pc, r5]
+
+float_table:
+        .byte (s15-float_table)/2
+        .byte (s14-float_table)/2
+        .byte (s13-float_table)/2
+        .byte (s12-float_table)/2
+        .byte (s11-float_table)/2
+        .byte (s10-float_table)/2
+        .byte (s9-float_table)/2
+        .byte (s8-float_table)/2
+        .byte (s7-float_table)/2
+        .byte (s6-float_table)/2
+        .byte (s5-float_table)/2
+        .byte (s4-float_table)/2
+        .byte (s3-float_table)/2
+        .byte (s2-float_table)/2
+        .byte (s1-float_table)/2
+        .byte (s0-float_table)/2
+
+stack_int:
+        ldr     r5, [lr], #4
+        str     r5, [ip], #4
+        b       scan_sig
+
+s0:
+        vldr    s0, [lr, #-4]
+        b       scan_sig
+s1:
+        vldr    s1, [lr, #-4]
+        b       scan_sig
+s2:
+        vldr    s2, [lr, #-4]
+        b       scan_sig
+s3:
+        vldr    s3, [lr, #-4]
+        b       scan_sig
+s4:
+        vldr    s4, [lr, #-4]
+        b       scan_sig
+s5:
+        vldr    s5, [lr, #-4]
+        b       scan_sig
+s6:
+        vldr    s6, [lr, #-4]
+        b       scan_sig
+s7:
+        vldr    s7, [lr, #-4]
+        b       scan_sig
+s8:
+        vldr    s8, [lr, #-4]
+        b       scan_sig
+s9:
+        vldr    s9, [lr, #-4]
+        b       scan_sig
+s10:
+        vldr    s10, [lr, #-4]
+        b       scan_sig
+s11:
+        vldr    s11, [lr, #-4]
+        b       scan_sig
+s12:
+        vldr    s12, [lr, #-4]
+        b       scan_sig
+s13:
+        vldr    s13, [lr, #-4]
+        b       scan_sig
+s14:
+        vldr    s14, [lr, #-4]
+        b       scan_sig
+s15:
+        vldr    s15, [lr, #-4]
+        b       scan_sig
+
+long:
+        cmp     r7, #2
+        mov     r7, #0
+        bne     stack_long
+
+        ldmia   lr!, {r2, r3}
+        b       scan_sig
+
+double:
+        lsrs    r5, r4, #1
+        it      cs
+        movcs   r6, r4
+
+        lsls    r4, r5, #1
+        beq     stack_double
+
+        sub     r4, r4, #2
+        add     lr, lr, #8
+        tbb     [pc, r5]
+
+double_table:
+        .byte 0
+        .byte (d7-double_table)/2
+        .byte (d6-double_table)/2
+        .byte (d5-double_table)/2
+        .byte (d4-double_table)/2
+        .byte (d3-double_table)/2
+        .byte (d2-double_table)/2
+        .byte (d1-double_table)/2
+        .byte (d0-double_table)/2
+        .align 2
+d0:
+        vldr    d0, [lr, #-8]
+        b       scan_sig
+d1:
+        vldr    d1, [lr, #-8]
+        b       scan_sig
+d2:
+        vldr    d2, [lr, #-8]
+        b       scan_sig
+d3:
+        vldr    d3, [lr, #-8]
+        b       scan_sig
+d4:
+        vldr    d4, [lr, #-8]
+        b       scan_sig
+d5:
+        vldr    d5, [lr, #-8]
+        b       scan_sig
+d6:
+        vldr    d6, [lr, #-8]
+        b       scan_sig
+d7:
+        vldr    d7, [lr, #-8]
+        b       scan_sig
+
+stack_double:
+        mov     r6, #0
+
+stack_long:
+        /* Ensure address is 8 byte aligned */
+        add     ip, ip, #7
+        bic     ip, ip, #7
+        
+        ldr     r5, [lr], #4
+        str     r5, [ip], #4
+        ldr     r5, [lr], #4
+        str     r5, [ip], #4
+        b       scan_sig
+
+done:
+        /* Call the function */
+        blx     r11
+
+        add     sp, sp, r10             /* Pop argument area */
+
+        ldr     r4, [sp, #32]           /* Reload ostack for */
+                                        /* address of return value */
+
+        ldrb    r5, [r8]                /* Return type */
+
+        cmp     r5, #86                 /* 'V' */
+        beq     return
+
+        cmp     r5, #68                 /* 'D' */
+        beq     return_double
+
+        cmp     r5, #70                 /* 'F' */
+        beq     return_float
+
+        str     r0, [r4], #4            /* Low word */
+
+        cmp     r5, #74                 /* 'J' */
+        it      eq
+        streq   r1, [r4], #4            /* High word */
+
+return:
+        mov     r0, r4                  /* return ostack */
+        ldmfd   sp!, {r4, r5, r6, r7, r8, r10, r11, lr}
+        bx      lr
+
+return_float:
+        vstr    s0, [r4]
+        add     r4, r4, #4
+        b       return
+
+return_double:
+        vstr    d0, [r4]
+        add     r4, r4, #8
+        b       return
diff --git a/src/os/linux/arm/callNativeEABIHardARM.S b/src/os/linux/arm/callNativeEABIHardARM.S
new file mode 100644
index 0000000..3a31acd
--- /dev/null
+++ b/src/os/linux/arm/callNativeEABIHardARM.S
@@ -0,0 +1,266 @@
+/*
+ * Copyright (C) 2011, 2012 Robert Lougher <rob@jamvm.org.uk>.
+ *
+ * This file is part of JamVM.
+ *
+ * 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 2,
+ * 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, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+        .text
+        .align  2
+        .global callJNIMethod
+        .type   callJNIMethod,function
+
+/*
+ * Arguments passed in:
+ *
+ * r0 JNIEnv
+ * r1 class or NULL
+ * r2 sig
+ * r3 extra arg
+ * sp + 0 ostack
+ * sp + 4 function pntr
+ * sp + 8 args count
+ */
+
+/* Register usage :
+ *
+ * lr ostack pntr
+ * ip scratch
+ * r11 function pntr
+ * r10 fp backfill 
+ * r8 fp reg
+ * r7 int reg
+ * r6 args pntr
+ * r5 sig pntr
+ * r4 extra stack
+ * r3, r2 outgoing int args
+ * r1 outgoing class or this pntr
+ * r0 outgoing JNIEnv (as passed in)
+ *
+ * s0 - s16 (d0 - d7) outgoing float args
+ */
+
+callJNIMethod:
+        stmfd   sp!, {r4, r5, r6, r7, r8, r10, r11, lr}
+        ldr     lr, [sp, #32]           /* get ostack pntr */
+        ldr     r11, [sp, #36]          /* get function pntr */
+
+        cmp     r1, #0                  /* is method non-static? */
+        ldreq   r1, [lr], #4            /* yes, load r1 with "this" */
+
+        mov     r4, r3
+        sub     sp, sp, r4              /* allocate room for stacked */
+        add     r5, r2, #1              /* init sig pntr -- skipping '(' */
+
+        mov     r6, sp                  /* init loop pntr */
+
+        mov     r7, #2
+        mov     r8, #16
+        mov     r10, #0
+
+scan_sig:
+        ldrb    ip, [r5], #1
+
+        cmp     ip, #41                 /* ')' */
+        beq     done
+
+        cmp     ip, #70                 /* 'F' */
+        beq     float
+
+        cmp     ip, #68                 /* 'D' */
+        beq     double
+
+        cmp     ip, #74                 /* 'J' */
+        beq     long
+
+skip_brackets:
+        cmp     ip, #91                 /* '[' */
+        ldreqb  ip, [r5], #1
+        beq     skip_brackets
+
+        cmp     ip, #76                 /* 'L' */
+        bne     int
+
+skip_ref:
+        ldrb    ip, [r5], #1
+        cmp     ip, #59                 /* ';' */
+        bne     skip_ref
+
+int:
+        cmp     r7, #0
+        beq     stack_int
+
+        subs    r7, r7, #1
+
+        ldrne   r2, [lr], #4
+        ldreq   r3, [lr], #4
+
+        b       scan_sig
+
+stack_int:
+        ldr     ip, [lr], #4
+        str     ip, [r6], #4
+        b       scan_sig
+
+float:
+        cmp     r10, #0
+        beq     no_backfill
+
+        sub     ip, r10, #1
+        mov     r10, #0
+        b       load_float
+
+no_backfill:
+        cmp     r8, #0
+        beq     stack_int
+        
+        sub     r8, r8, #1
+        mov     ip, r8
+
+load_float:
+        add     lr, lr, #4
+        add     pc, pc, ip, lsl #3
+        nop
+
+        flds    s15, [lr, #-4]
+        b       scan_sig
+        flds    s14, [lr, #-4]
+        b       scan_sig
+        flds    s13, [lr, #-4]
+        b       scan_sig
+        flds    s12, [lr, #-4]
+        b       scan_sig
+        flds    s11, [lr, #-4]
+        b       scan_sig
+        flds    s10, [lr, #-4]
+        b       scan_sig
+        flds    s9, [lr, #-4]
+        b       scan_sig
+        flds    s8, [lr, #-4]
+        b       scan_sig
+        flds    s7, [lr, #-4]
+        b       scan_sig
+        flds    s6, [lr, #-4]
+        b       scan_sig
+        flds    s5, [lr, #-4]
+        b       scan_sig
+        flds    s4, [lr, #-4]
+        b       scan_sig
+        flds    s3, [lr, #-4]
+        b       scan_sig
+        flds    s2, [lr, #-4]
+        b       scan_sig
+        flds    s1, [lr, #-4]
+        b       scan_sig
+        flds    s0, [lr, #-4]
+        b       scan_sig
+
+long:
+        cmp     r7, #2
+        mov     r7, #0
+        bne     stack_long
+
+        ldr     r2, [lr], #4
+        ldr     r3, [lr], #4
+        b       scan_sig
+
+double:
+        lsrs    ip, r8, #1
+        movcs   r10, r8
+
+        lsls    r8, ip, #1
+        beq     stack_double
+
+        sub     r8, r8, #2
+        add     lr, lr, #8
+        add     pc, pc, ip, lsl #3
+        nop
+        nop
+        nop
+
+        fldd    d7, [lr, #-8]
+        b       scan_sig
+        fldd    d6, [lr, #-8]
+        b       scan_sig
+        fldd    d5, [lr, #-8]
+        b       scan_sig
+        fldd    d4, [lr, #-8]
+        b       scan_sig
+        fldd    d3, [lr, #-8]
+        b       scan_sig
+        fldd    d2, [lr, #-8]
+        b       scan_sig
+        fldd    d1, [lr, #-8]
+        b       scan_sig
+        fldd    d0, [lr, #-8]
+        b       scan_sig
+
+stack_double:
+        mov     r10, #0
+
+stack_long:
+        /* Ensure address is 8 byte aligned */
+        add     r6, r6, #7
+        bic     r6, r6, #7
+        
+        ldr     ip, [lr], #4
+        str     ip, [r6], #4
+        ldr     ip, [lr], #4
+        str     ip, [r6], #4
+        b       scan_sig
+
+done:
+        /* Call the function */
+#if defined(__ARM_ARCH_4__) || defined(__ARM_ARCH_4T__)
+        mov     lr, pc
+        bx      r11
+#else
+        blx     r11
+#endif
+
+        add     sp, sp, r4              /* Pop argument area */
+        ldr     r4, [sp, #32]           /* Reload ostack for */
+                                        /* address of return value */
+        ldrb    ip, [r5]                /* Return type */
+
+        cmp     ip, #86                 /* 'V' */
+        beq     return
+
+        cmp     ip, #68                 /* 'D' */
+        beq     return_double
+
+        cmp     ip, #70                 /* 'F' */
+        beq     return_float
+
+        str     r0, [r4], #4            /* Low word */
+
+        cmp     ip, #74                 /* 'J' */
+        streq   r1, [r4], #4            /* High word */
+
+return:
+        mov     r0, r4                  /* return ostack */
+        ldmfd   sp!, {r4, r5, r6, r7, r8, r10, r11, lr}
+        bx      lr
+
+return_float:
+        add     r4, r4, #4
+        fsts    s0, [r4, #-4]
+        b       return
+
+return_double:
+        add     r4, r4, #8
+        fstd    d0, [r4, #-8]
+        b       return
diff --git a/src/os/linux/arm/dll_md.c b/src/os/linux/arm/dll_md.c
index f5df90e..39bdf7c 100644
--- a/src/os/linux/arm/dll_md.c
+++ b/src/os/linux/arm/dll_md.c
@@ -1,6 +1,6 @@
 /*
- * Copyright (C) 2003, 2004, 2005, 2006, 2007
- * Robert Lougher <rob@lougher.org.uk>.
+ * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2011
+ * Robert Lougher <rob@jamvm.org.uk>.
  *
  * This file is part of JamVM.
  *
@@ -31,6 +31,61 @@
  * out stack requirements and then to push arguments.  To
  * save the first scan at call time, the signature is pre-
  * scanned and stack requirement stored in the extra argument. */
+
+#ifdef __ARM_PCS_VFP
+int nativeExtraArg(MethodBlock *mb) {
+    char *sig = mb->type;
+    int fp_backfill = 0;
+    int stack_args = 0;
+    int int_args = 2;
+    int fp_args = 16;
+
+    while(*++sig != ')')
+        switch(*sig) {
+            case 'J':
+                if(int_args < 2)
+                    stack_args = (stack_args + 15) & ~7;
+                int_args = 0;
+                break;
+
+            case 'D':
+                fp_backfill |= fp_args & 1;
+                fp_args &= ~1;
+
+                if(fp_args == 0) {
+                    stack_args = (stack_args + 15) & ~7;
+                    fp_backfill = 0;
+                } else
+                    fp_args -= 2;
+                break;
+
+            case 'F':
+                if(fp_backfill)
+                    fp_backfill = 0;
+                else {
+                    if(fp_args == 0) 
+                        stack_args += 4;
+                    else
+                        fp_args--;
+                }
+                break;
+
+            default:
+                if(int_args == 0)
+                    stack_args += 4;
+                else
+                    int_args--;
+
+                if(*sig == '[')
+                    while(*++sig == '[');
+                if(*sig == 'L')
+                    while(*++sig != ';');
+                break;
+        }
+
+    return (stack_args + 7) & ~7;
+}
+#else
 int nativeExtraArg(MethodBlock *mb) {
     char *sig = mb->type;
     int args = 0;
@@ -57,7 +112,7 @@ int nativeExtraArg(MethodBlock *mb) {
        native method, so minimum stack requirement is 8 bytes. */
     return args < 8 ? 8 : args;
 }
-
+#endif
 #else
 
 /* Under OABI, arguments can be copied onto the stack "as is"
-- 
2.17.1