# $Id: Makefile-wrapper.gmk $
## @file
# Makefile template for a wrapper module.
#

#
# Copyright (C) 2006-2022 Oracle and/or its affiliates.
#
# This file is part of VirtualBox base platform packages, as
# available from https://www.virtualbox.org.
#
# 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, in version 3 of the
# License.
#
# 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, see <https://www.gnu.org/licenses>.
#
# The contents of this file may alternatively be used under the terms
# of the Common Development and Distribution License Version 1.0
# (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
# in the VirtualBox distribution, in which case the provisions of the
# CDDL are applicable instead of those of the GPL.
#
# You may elect to license modified versions of this file under the
# terms and conditions of either the GPL or the CDDL or both.
#
# SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
#

# Check template parameters.
ifndef WRAPPED_MODULE_NAME
$(error WRAPPED_MODULE_NAME not defined)
endif
ifndef VBOXMOD_NAME
$(error VBOXMOD_NAME not defined)
endif


# Linux kbuild sets this to our source directory if we are called from there
ifndef VBOX_MODULE_SRC_DIR
 VBOX_MODULE_SRC_DIR := $(abspath $(dir $(lastword $(MAKEFILE_LIST))))/
endif
VBOXDRV_DIR          := $(abspath $(VBOX_MODULE_SRC_DIR)../vboxdrv/)/
VBOX_VMMR0_DIR       := $(abspath $(VBOX_MODULE_SRC_DIR)../vbox_vmmr0/)/
include $(VBOXDRV_DIR)Makefile-header.gmk

# All of these wrappers depend on
ifndef KBUILD_EXTRA_SYMBOLS
KBUILD_EXTRA_SYMBOLS := $(VBOXDRV_DIR)Module.symvers
 ifdef WRAPPER_NEED_VMMR0
KBUILD_EXTRA_SYMBOLS += $(VBOX_VMMR0_DIR)Module.symvers
 endif
endif

VBOXMOD_OBJS = \
	SUPWrapperMod-linux.o \
	$(WRAPPED_MODULE_NAME).o

VBOXMOD_INCL  = \
	$(VBOXDRV_DIR) \
	$(VBOXDRV_DIR)include \
	$(VBOXDRV_DIR)r0drv/linux

VBOXMOD_DEFS += \
	RT_OS_LINUX \
	IN_RING0 \
	IN_RT_R0 \
	IN_SUP_R0 \
	VBOX \
       \
	WRAPPED_MODULE_NAME=\"$(WRAPPED_MODULE_NAME).r0\" \
	WRAPPED_MODULE_SYMBOL_INCLUDE=\"$(WRAPPED_MODULE_NAME)-symbols.h\"
ifdef WRAPPED_MODULE_FLAGS
VBOXMOD_DEFS += WRAPPED_MODULE_FLAGS="$(WRAPPED_MODULE_FLAGS)"
endif
ifdef WRAPPED_MODULE_LINUX_EXPORTS
VBOXMOD_DEFS += WRAPPED_MODULE_LINUX_EXPORTS
endif
ifdef WRAPPED_MODULE_SRV_REQ_HANDLER
VBOXMOD_DEFS += WRAPPED_MODULE_SRV_REQ_HANDLER="$(WRAPPED_MODULE_SRV_REQ_HANDLER)"
endif
ifdef WRAPPED_MODULE_IS_VMMR0
VBOXMOD_DEFS += WRAPPED_MODULE_VMMR0_ENTRY_FAST=VMMR0EntryFast
VBOXMOD_DEFS += WRAPPED_MODULE_VMMR0_ENTRY_EX=VMMR0EntryEx
endif
ifdef WRAPPED_MODULE_NO_INIT
VBOXMOD_DEFS += WRAPPED_MODULE_INIT=NULL
endif
ifdef WRAPPED_MODULE_NO_TERM
VBOXMOD_DEFS += WRAPPED_MODULE_TERM=NULL
endif
ifdef WRAPPED_MODULE_LICENSE_PROPRIETARY
VBOXMOD_DEFS += WRAPPED_MODULE_LICENSE_PROPRIETARY
endif

VBOXMOD_CFLAGS = -include $(VBOXDRV_DIR)include/VBox/SUPDrvMangling.h \
	-fno-omit-frame-pointer -fno-pie -Wno-declaration-after-statement

## @todo cleanup

include $(VBOXDRV_DIR)Makefile-footer.gmk


#
# Custom rules (some of this could later be done before install).
#
SUPWrapperMod-linux.c \
$(VBOX_MODULE_SRC_DIR)SUPWrapperMod-linux.c \
$(VBOX_MODULE_SRC_DIR)SUPWrapperMod-linux.o \
: $(VBOX_MODULE_SRC_DIR)$(WRAPPED_MODULE_NAME)-symbols.h

$(VBOX_MODULE_SRC_DIR)$(WRAPPED_MODULE_NAME)-symbols.h: \
		$(VBOX_MODULE_SRC_DIR)$(WRAPPED_MODULE_NAME).r0 \
		$(VBOX_MODULE_SRC_DIR)Makefile-wrapper.gmk \
		$(VBOX_MODULE_SRC_DIR)Makefile
	rm -f -- "$@" "$@-tmp1" "$@-tmp2"
	objdump --syms "$<" > "$@-tmp1"
	sed 	-e '/[[:space:]].hidden[[:space:]]/d' \
		-e '/[[:space:]]\*UND\*[[:space:]]/d' \
		-e '/[[:space:]]vboxr0mod_/d' \
		-e '/^[[:xdigit:]][[:xdigit:]]*[[:space:]][gu]/!d' \
		-e 's/^\([[:xdigit:]]*\)[[:space:]].*000[[:xdigit:]]*[[:space:]]\([_a-zA-Z].*\)$$/SYMBOL_ENTRY(\2)/' \
		-e '/SYMBOL_ENTRY(ModuleInit)/d' \
		-e '/SYMBOL_ENTRY(ModuleTerm)/d' \
		"$@-tmp1" > "$@-tmp2"
	sort "$@-tmp2" > "$@"
	rm -f -- "$@-tmp1" "$@-tmp2"


$(VBOX_MODULE_SRC_DIR)$(WRAPPED_MODULE_NAME).mangle-symbols: \
		$(VBOXDRV_DIR)Module.symvers \
		$(VBOX_MODULE_SRC_DIR)$(WRAPPED_MODULE_NAME)-symbols.h \
		$(VBOX_MODULE_SRC_DIR)Makefile-wrapper.gmk \
		$(VBOX_MODULE_SRC_DIR)Makefile
	sed	-e 's/SYMBOL_ENTRY(\([^)]*\))/\/\1 VBoxHost_\1\/d/' \
		"$(VBOX_MODULE_SRC_DIR)$(WRAPPED_MODULE_NAME)-symbols.h" \
               > "$@-ignore.sed"
	sed	-e '/[[:space:]]VBoxHost_/!d' \
		-e 's/^0x[[:xdigit:]]*[[:space:]]VBoxHost_\([^[:space:]]*\)[[:space:]].*$$/\1 VBoxHost_\1/' \
		-f "$@-ignore.sed" \
		"$<" \
		> "$@"

$(VBOX_MODULE_SRC_DIR)$(WRAPPED_MODULE_NAME).o: \
		$(VBOX_MODULE_SRC_DIR)$(WRAPPED_MODULE_NAME).r0 \
		$(VBOX_MODULE_SRC_DIR)$(WRAPPED_MODULE_NAME).debug \
		$(VBOX_MODULE_SRC_DIR)$(WRAPPED_MODULE_NAME).mangle-symbols \
		$(VBOX_MODULE_SRC_DIR)Makefile-wrapper.gmk \
		$(VBOX_MODULE_SRC_DIR)Makefile \
               $(if $(CONFIG_UNWINDER_ORC),$(objtool_dep),)
	rm -f -- "$@" "$@-tmp"
	eu-unstrip -o "$@-tmp" $(VBOX_MODULE_SRC_DIR)$(WRAPPED_MODULE_NAME).r0 $(VBOX_MODULE_SRC_DIR)$(WRAPPED_MODULE_NAME).debug
	objcopy --redefine-syms=$(VBOX_MODULE_SRC_DIR)$(WRAPPED_MODULE_NAME).mangle-symbols "$@-tmp" "$@"
	rm -f -- "$@-tmp"
ifdef CONFIG_UNWINDER_ORC # Must generate the ORC sections.
	$(__objtool_obj) $(objtool_args)  $@
endif
	touch $(VBOX_MODULE_SRC_DIR).$(WRAPPED_MODULE_NAME).o.cmd