2020-08-18 14:17:44 -05:00
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# libwolfssl Kbuild
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2020-08-28 10:32:30 -05:00
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SHELL=/bin/bash
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2020-08-18 14:17:44 -05:00
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ifeq "$(WOLFSSL_OBJ_FILES)" ""
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$(error $$WOLFSSL_OBJ_FILES is unset.)
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endif
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ifeq "$(WOLFSSL_CFLAGS)" ""
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$(error $$WOLFSSL_CFLAGS is unset.)
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endif
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2020-08-28 10:32:30 -05:00
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obj-m := libwolfssl.o
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WOLFSSL_OBJ_TARGETS=$(patsubst %, $(obj)/%, $(WOLFSSL_OBJ_FILES))
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$(obj)/linuxkm/module_exports.o: $(WOLFSSL_OBJ_TARGETS)
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2020-08-22 01:10:28 -05:00
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# this mechanism only works in kernel 5.x+ (fallback to hardcoded value)
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2020-08-22 00:32:32 -05:00
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hostprogs := linuxkm/get_thread_size
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always-y := $(hostprogs)
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HOST_EXTRACFLAGS += $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(KBUILD_CFLAGS) -static
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2020-08-22 01:10:28 -05:00
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# this rule is needed to get build to succeed in 4.x (get_thread_size still doesn't get built)
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$(obj)/linuxkm/get_thread_size: $(src)/linuxkm/get_thread_size.c
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2020-08-28 10:32:30 -05:00
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$(WOLFSSL_OBJ_TARGETS): | $(obj)/linuxkm/get_thread_size
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2020-08-22 01:10:28 -05:00
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KERNEL_THREAD_STACK_SIZE=$(shell test -x $(obj)/linuxkm/get_thread_size && $(obj)/linuxkm/get_thread_size || echo 16384)
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2020-08-22 00:32:32 -05:00
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MAX_STACK_FRAME_SIZE=$(shell echo $$(( $(KERNEL_THREAD_STACK_SIZE) / 4)))
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2020-08-28 10:32:30 -05:00
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libwolfssl-y := $(WOLFSSL_OBJ_FILES) linuxkm/module_hooks.o linuxkm/module_exports.o
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2020-08-18 14:17:44 -05:00
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2020-08-22 00:32:32 -05:00
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ccflags-y = $(WOLFSSL_CFLAGS) -Wframe-larger-than=$(MAX_STACK_FRAME_SIZE) -mpreferred-stack-boundary=4
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2020-08-19 13:39:54 -05:00
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%/libwolfssl.mod.o: ccflags-y :=
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2020-08-28 10:32:30 -05:00
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%/test.o: ccflags-y += -DNO_MAIN_DRIVER
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2020-08-18 14:17:44 -05:00
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asflags-y := $(WOLFSSL_ASFLAGS)
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2020-08-26 13:42:57 -05:00
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# these two _asms are kernel-compatible (they don't reference the pic-related _GLOBAL_OFFSET_TABLE_)
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# but they still irritate objtool: "unannotated intra-function call" and "BP used as a scratch register"
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%/aes_asm.o: OBJECT_FILES_NON_STANDARD := y
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%/aes_gcm_asm.o: OBJECT_FILES_NON_STANDARD := y
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2020-08-28 10:32:30 -05:00
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# auto-generate the exported symbol list, leveraging the WOLFSSL_API visibility tags.
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# exclude symbols that don't match wc_* or wolf*.
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$(src)/linuxkm/module_exports.c: $(src)/linuxkm/module_exports.c.template $(WOLFSSL_OBJ_TARGETS)
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@cp $< $@
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@readelf --symbols --wide $(WOLFSSL_OBJ_TARGETS) | awk '/^ *[0-9]+: /{if ($$8 !~ /^(wc_|wolf)/){next;} if (($$4 == "FUNC") && ($$5 == "GLOBAL") && ($$6 == "DEFAULT")) { print "EXPORT_SYMBOL(" $$8 ");"; }}' >> $@
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@echo 'EXPORT_SYMBOL(wolfcrypt_test);' >> $@
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clean-files := module_exports.c
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