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# Linux kernel-native Makefile ("Kbuild") for libwolfssl.ko
#
# Copyright (C) 2006-2022 wolfSSL Inc.
#
# This file is part of wolfSSL.
#
# wolfSSL 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 of the License, or
# (at your option) any later version.
#
# wolfSSL 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 02110-1335, USA
SHELL=/bin/bash
ifeq "$(WOLFSSL_OBJ_FILES)" ""
$(error $$WOLFSSL_OBJ_FILES is unset.)
endif
ifeq "$(WOLFSSL_CFLAGS)" ""
$(error $$WOLFSSL_CFLAGS is unset.)
endif
WOLFSSL_CFLAGS += -ffreestanding -Wframe-larger-than=$(MAX_STACK_FRAME_SIZE) -isystem $(shell $(CC) -print-file-name=include)
ifeq "$(KERNEL_ARCH)" "x86"
WOLFSSL_CFLAGS += -mpreferred-stack-boundary=4
endif
obj-m := libwolfssl.o
WOLFSSL_OBJ_TARGETS := $(patsubst %, $(obj)/%, $(WOLFSSL_OBJ_FILES))
ifeq "$(ENABLED_LINUXKM_PIE)" "yes"
WOLFCRYPT_PIE_FILES := $(patsubst %, $(obj)/%, $(WOLFCRYPT_PIE_FILES))
endif
$(obj)/linuxkm/module_exports.o: $(WOLFSSL_OBJ_TARGETS)
# this mechanism only works in kernel 5.x+ (fallback to hardcoded value)
hostprogs := linuxkm/get_thread_size
always-y := $(hostprogs)
# "-mindirect-branch=keep -mfunction-return=keep" to avoid "undefined reference
# to `__x86_return_thunk'" on CONFIG_RETHUNK kernels (5.19.0-rc7)
HOST_EXTRACFLAGS += $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(KBUILD_CFLAGS) -static -fno-omit-frame-pointer -mindirect-branch=keep -mfunction-return=keep
# this rule is needed to get build to succeed in 4.x (get_thread_size still doesn't get built)
$(obj)/linuxkm/get_thread_size: $(src)/linuxkm/get_thread_size.c
$(WOLFSSL_OBJ_TARGETS): | $(obj)/linuxkm/get_thread_size
KERNEL_THREAD_STACK_SIZE=$(shell test -x $(obj)/linuxkm/get_thread_size && $(obj)/linuxkm/get_thread_size || echo 16384)
MAX_STACK_FRAME_SIZE=$(shell echo $$(( $(KERNEL_THREAD_STACK_SIZE) / 4)))
libwolfssl-y := $(WOLFSSL_OBJ_FILES) linuxkm/module_hooks.o linuxkm/module_exports.o
WOLFSSL_CFLAGS_NO_VECTOR_INSNS := $(CFLAGS_SIMD_DISABLE) $(CFLAGS_FPU_DISABLE)
ifeq "$(ENABLED_ASM)" "yes"
WOLFSSL_CFLAGS_YES_VECTOR_INSNS := $(CFLAGS_SIMD_ENABLE) $(CFLAGS_FPU_DISABLE) $(CFLAGS_AUTO_VECTORIZE_DISABLE)
else
WOLFSSL_CFLAGS_YES_VECTOR_INSNS := $(WOLFSSL_CFLAGS_NO_VECTOR_INSNS)
endif
ccflags-y := $(WOLFSSL_CFLAGS) $(WOLFSSL_CFLAGS_NO_VECTOR_INSNS)
$(obj)/libwolfssl.mod.o: ccflags-y :=
$(obj)/wolfcrypt/test/test.o: ccflags-y += -DNO_MAIN_DRIVER
$(obj)/wolfcrypt/src/aes.o: ccflags-y = $(WOLFSSL_CFLAGS) $(WOLFSSL_CFLAGS_YES_VECTOR_INSNS)
ifeq "$(ENABLED_LINUXKM_PIE)" "yes"
PIE_FLAGS := -fPIE -fno-stack-protector -fno-toplevel-reorder
PIE_SUPPORT_FLAGS := -DUSE_WOLFSSL_LINUXKM_PIE_REDIRECT_TABLE
ifeq "$(KERNEL_ARCH)" "x86"
PIE_FLAGS += -mcmodel=small -mindirect-branch=keep -mfunction-return=keep
endif
ifeq "$(KERNEL_ARCH)" "mips"
PIE_FLAGS += -mabicalls
endif
$(WOLFCRYPT_PIE_FILES): ccflags-y += $(PIE_SUPPORT_FLAGS) $(PIE_FLAGS)
$(WOLFCRYPT_PIE_FILES): ccflags-remove-y += -pg
# disabling retpoline generation leads to profuse warnings without this:
$(WOLFCRYPT_PIE_FILES): OBJECT_FILES_NON_STANDARD := y
$(obj)/linuxkm/module_hooks.o: ccflags-y += $(PIE_SUPPORT_FLAGS)
endif
asflags-y := $(WOLFSSL_ASFLAGS) $(ASFLAGS_FPUSIMD_DISABLE)
# vectorized implementations that are kernel-safe are listed here.
# these are known kernel-compatible, but they still irritate objtool.
$(obj)/wolfcrypt/src/aes_asm.o: asflags-y = $(WOLFSSL_ASFLAGS) $(ASFLAGS_FPU_DISABLE_SIMD_ENABLE)
$(obj)/wolfcrypt/src/aes_asm.o: OBJECT_FILES_NON_STANDARD := y
$(obj)/wolfcrypt/src/aes_gcm_asm.o: asflags-y = $(WOLFSSL_ASFLAGS) $(ASFLAGS_FPU_DISABLE_SIMD_ENABLE)
$(obj)/wolfcrypt/src/aes_gcm_asm.o: OBJECT_FILES_NON_STANDARD := y
$(obj)/wolfcrypt/src/sp_x86_64_asm.o: asflags-y = $(WOLFSSL_ASFLAGS) $(ASFLAGS_FPU_DISABLE_SIMD_ENABLE)
$(obj)/wolfcrypt/src/sp_x86_64_asm.o: OBJECT_FILES_NON_STANDARD := y
ifeq "$(ENABLED_LINUXKM_PIE)" "yes"
rename-pie-text-and-data-sections: $(WOLFSSL_OBJ_TARGETS)
ifndef NM
NM := nm
endif
ifndef READELF
READELF := readelf
endif
ifndef OBJCOPY
OBJCOPY := objcopy
endif
.PHONY: rename-pie-text-and-data-sections
rename-pie-text-and-data-sections:
ifneq "$(quiet)" "silent_"
@echo -n ' Checking wolfCrypt for unresolved symbols and forbidden relocations... '
endif
@cd "$(obj)" || exit $$?; \
$(LD) -relocatable -o wolfcrypt_test_link.o $(WOLFCRYPT_PIE_FILES) || exit $$?; \
undefined=$$($(NM) --undefined-only wolfcrypt_test_link.o) || exit $$?; \
GOT_relocs=$$($(READELF) --relocs --wide wolfcrypt_test_link.o | egrep '^[^ ]+ +[^ ]+ +[^ ]*GOT[^ ]* ') || [ $$? = 1 ] || exit 2; \
rm wolfcrypt_test_link.o; \
if [ -n "$$undefined" ]; then \
echo "wolfCrypt container has unresolved symbols:" 1>&2; \
echo "$$undefined" 1>&2; \
exit 1; \
fi; \
if [ -n "$$GOT_relocs" ]; then \
echo "wolfCrypt container has GOT relocations (non-local function address used as operand?):" 1>&2; \
echo "$$GOT_relocs" 1>&2; \
exit 1; \
fi
ifneq "$(quiet)" "silent_"
@echo 'OK.'
endif
@cd "$(obj)" || exit $$?; \
for file in $(WOLFCRYPT_PIE_FILES); do \
$(OBJCOPY) --rename-section .text=.text.wolfcrypt --rename-section .data=.data.wolfcrypt "$$file" || exit $$?; \
done
ifneq "$(quiet)" "silent_"
@echo ' wolfCrypt .{text,data} sections containerized to .{text,data}.wolfcrypt'
endif
$(src)/linuxkm/module_exports.c: rename-pie-text-and-data-sections
endif
# auto-generate the exported symbol list, leveraging the WOLFSSL_API visibility tags.
# exclude symbols that don't match wc_* or wolf*.
$(src)/linuxkm/module_exports.c: $(src)/linuxkm/module_exports.c.template $(WOLFSSL_OBJ_TARGETS)
@cp $< $@
@readelf --symbols --wide $(WOLFSSL_OBJ_TARGETS) | \
awk '/^ *[0-9]+: / { \
if ($$8 !~ /^(wc_|wolf|WOLF|TLSX_)/){next;} \
if (($$4 == "FUNC") && ($$5 == "GLOBAL") && ($$6 == "DEFAULT")) { \
print "EXPORT_SYMBOL_NS_GPL(" $$8 ", WOLFSSL);"; \
} \
}' >> $@
@echo -e '#ifndef NO_CRYPT_TEST\nEXPORT_SYMBOL_NS_GPL(wolfcrypt_test, WOLFSSL);\n#endif' >> $@
clean-files := module_exports.c linuxkm src wolfcrypt/src wolfcrypt/test wolfcrypt
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