Add logic to generate headers reflecting the compatibility mode layout

of hypercall arguments. Provide infrastructure for accessing handles
passed from compatibility mode guests. Vector those hypercalls not
needing any translation to their native implementations.

Signed-off-by: Jan Beulich <jbeulich@novell.com>

1 files changed, 57 insertions, 0 deletions

diff --git a/xen/include/Makefile b/xen/include/Makefile
new file mode 100644
index 0000000000..1cc0d79baf
--- /dev/null
+++ b/xen/include/Makefile
@@ -0,0 +1,57 @@
+ifneq ($(CONFIG_COMPAT),)
+
+compat-arch-$(CONFIG_X86) := x86_32
+
+headers-y                 := $(shell echo public/*.h | sed -e 's,[^[:space:]]*-[^[:space:]]*,,g' -e 's,public/,compat/,g')
+headers-y                 := $(filter-out %/dom0_ops.h,$(headers-y))
+headers-y                 += compat/arch-$(compat-arch-y).h
+
+cppflags-y                := -include public/xen-compat.h
+cppflags-$(CONFIG_X86)    += -m32
+
+# 8-byte types are 4-byte aligned on x86_32 ...
+prefix-$(CONFIG_X86)      := \#pragma pack(push, 4)
+suffix-$(CONFIG_X86)      := \#pragma pack(pop)
+
+endif
+
+.PHONY: all
+all: $(headers-y)
+
+compat/%.h: compat/%.i Makefile
+	id=_$$(echo $@ | sed 'y,abcdefghijklmnopqrstuvwxyz-/.,ABCDEFGHIJKLMNOPQRSTUVWXYZ___,'); \
+	echo "#ifndef $$id" >$@.new; \
+	echo "#define $$id" >>$@.new; \
+	echo "#include <xen/compat.h>" >>$@.new; \
+	$(if $(filter-out compat/arch-%.h,$@),echo "#include <$(patsubst compat/%,public/%,$@)>" >>$@.new;) \
+	$(if $(prefix-y),echo "$(prefix-y)" >>$@.new;) \
+	grep -v '^# [[:digit:]]' $< | \
+	sed -e 's,__InClUdE__,#include,' \
+	    -e 's,"xen-compat.h",<public/xen-compat.h>,' \
+	    -e 's,\(struct\|union\|enum\)[[:space:]]\+\(xen_\?\)\?\([[:alpha:]_]\),\1 compat_\3,g' \
+	    -e 's,_t\([^[:alnum:]_]\|$$\),_compat_t\1,g' \
+	    -e 's,\(8\|16\|32\|64\)_compat_t\([^[:alnum:]_]\|$$\),\1_t\2,g' \
+	    -e 's,\(^\|[^[:alnum:]_]\)xen_\?\([[:alnum:]_]*\)_compat_t\([^[:alnum:]_]\|$$\),\1compat_\2_t\3,g' \
+	    -e 's,\(^\|[^[:alnum:]_]\)XEN_\?,\1COMPAT_,' \
+	    -e 's,\(^\|[^[:alnum:]_]\)Xen_\?,\1Compat_,' \
+	    -e 's,\(^\|[^[:alnum:]]\)long\([^[:alnum:]]\|$$\),\1int\2,g' | \
+	uniq >>$@.new; \
+	$(if $(suffix-y),echo "$(suffix-y)" >>$@.new;) \
+	echo "#endif /* $$id */" >>$@.new
+	mv -f $@.new $@
+
+compat/%.i: compat/%.c Makefile
+	$(CPP) $(CFLAGS) $(cppflags-y) -o $@ $<
+
+compat/%.c: public/%.h Makefile
+	mkdir -p $(@D)
+	grep -v 'DEFINE_XEN_GUEST_HANDLE(long)' $< | \
+	sed -e 's,^[[:space:]]*#[[:space:]]*include[[:space:]]\+,__InClUdE__ ,' \
+	    -e 's,^[[:space:]]*#[[:space:]]*define[[:space:]]\+\([[:upper:]_]*_GUEST_HANDLE\),#define HIDE_\1,' \
+	    -e 's,^[[:space:]]*#[[:space:]]*define[[:space:]]\+\([[:lower:]_]*_guest_handle\),#define hide_\1,' \
+	    -e 's,XEN_GUEST_HANDLE\(_[[:xdigit:]]\+\)\?,COMPAT_HANDLE,g' \
+	    >$@.new
+	mv -f $@.new $@
+
+clean::
+	rm -rf compat