112 lines
3.7 KiB
Makefile
112 lines
3.7 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0
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#
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# Building a vDSO image for AArch64.
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#
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# Author: Will Deacon <will.deacon@arm.com>
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# Heavily based on the vDSO Makefiles for other archs.
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#
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# Absolute relocation type $(ARCH_REL_TYPE_ABS) needs to be defined before
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# the inclusion of generic Makefile.
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ARCH_REL_TYPE_ABS := R_AARCH64_JUMP_SLOT|R_AARCH64_GLOB_DAT|R_AARCH64_ABS64
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include $(srctree)/lib/vdso/Makefile
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obj-ilp32-vdso := vgettimeofday-ilp32.o note-ilp32.o sigreturn-ilp32.o
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# Build rules
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targets := $(obj-ilp32-vdso) vdso-ilp32.so vdso-ilp32.so.dbg
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obj-ilp32-vdso := $(addprefix $(obj)/, $(obj-ilp32-vdso))
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btildflags-$(CONFIG_ARM64_BTI_KERNEL) += -z force-bti
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# -Bsymbolic has been added for consistency with arm, the compat vDSO and
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# potential future proofing if we end up with internal calls to the exported
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# routines, as x86 does (see 6f121e548f83 ("x86, vdso: Reimplement vdso.so
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# preparation in build-time C")).
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ldflags-y := -shared -nostdlib -soname=linux-ilp32-vdso.so.1 --hash-style=sysv \
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-Bsymbolic $(call ld-option, --no-eh-frame-hdr) --build-id -n \
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$(btildflags-y) -T
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ccflags-y := -fno-common -fno-builtin -fno-stack-protector -ffixed-x18
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ccflags-y += -DDISABLE_BRANCH_PROFILING
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#ccflags-y += -nostdlib
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ccflags-y += -nostdlib -Wl,-soname=linux-ilp32-vdso.so.1 \
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$(call cc-ldoption, -Wl$(comma)--hash-style=sysv)
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CFLAGS_REMOVE_vgettimeofday-ilp32.o = $(CC_FLAGS_FTRACE) -Os $(CC_FLAGS_SCS) $(GCC_PLUGINS_CFLAGS)
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KBUILD_CFLAGS += $(DISABLE_LTO)
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KASAN_SANITIZE := n
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UBSAN_SANITIZE := n
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OBJECT_FILES_NON_STANDARD := y
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KCOV_INSTRUMENT := n
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CFLAGS_vgettimeofday-ilp32.o = -O2 -mcmodel=tiny -fasynchronous-unwind-tables -mabi=ilp32
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ifneq ($(c-gettimeofday-y),)
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CFLAGS_vgettimeofday-ilp32.o += -include $(c-gettimeofday-y)
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endif
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# Clang versions less than 8 do not support -mcmodel=tiny
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ifeq ($(CONFIG_CC_IS_CLANG), y)
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ifeq ($(shell test $(CONFIG_CLANG_VERSION) -lt 80000; echo $$?),0)
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CFLAGS_REMOVE_vgettimeofday-ilp32.o += -mcmodel=tiny
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endif
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endif
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# Disable gcov profiling for VDSO code
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GCOV_PROFILE := n
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KASAN_SANITIZE := n
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UBSAN_SANITIZE := n
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KCOV_INSTRUMENT := n
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obj-y += vdso-ilp32.o
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extra-y += vdso-ilp32.lds
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CPPFLAGS_vdso-ilp32.lds += -P -C -U$(ARCH) -mabi=ilp32
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# Force dependency (incbin is bad)
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$(obj)/vdso-ilp32.o : $(obj)/vdso-ilp32.so
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# Link rule for the .so file, .lds has to be first
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$(obj)/vdso-ilp32.so.dbg: $(obj)/vdso-ilp32.lds $(obj-ilp32-vdso)
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$(call if_changed,vdso-ilp32ld_and_vdso_check)
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# Strip rule for the .so file
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$(obj)/%.so: OBJCOPYFLAGS := -S
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$(obj)/%.so: $(obj)/%.so.dbg FORCE
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$(call if_changed,objcopy)
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# Generate VDSO offsets using helper script
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gen-vdsosym := $(srctree)/$(src)/../vdso/gen_vdso_offsets.sh
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quiet_cmd_vdsosym = VDSOSYM $@
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cmd_vdsosym = $(NM) $< | $(gen-vdsosym) | LC_ALL=C sort > $@
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include/generated/vdso-ilp32-offsets.h: $(obj)/vdso-ilp32.so.dbg FORCE
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$(call if_changed,vdsosym)
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$(obj)/vgettimeofday-ilp32.o: $(src)/../vdso/vgettimeofday.c
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$(call if_changed_dep,vdso-ilp32cc)
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$(obj)/note-ilp32.o: $(src)/../vdso/note.S
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$(call if_changed_dep,vdso-ilp32as)
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$(obj)/sigreturn-ilp32.o: $(src)/../vdso/sigreturn.S
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$(call if_changed_dep,vdso-ilp32as)
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# Actual build commands
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quiet_cmd_vdso-ilp32ld_and_vdso_check = LD $@
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cmd_vdso-ilp32ld_and_vdso_check = $(CC) $(c_flags) -mabi=ilp32 -Wl,-n -Wl,-T $^ -o $@
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quiet_cmd_vdso-ilp32cc = VDSOILP32C $@
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cmd_vdso-ilp32cc= $(CC) $(c_flags) -mabi=ilp32 -c -o $@ $<
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quiet_cmd_vdso-ilp32as = VDSOILP32A $@
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cmd_vdso-ilp32as = $(CC) $(a_flags) -mabi=ilp32 -c -o $@ $<
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# Install commands for the unstripped file
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quiet_cmd_vdso_install = INSTALL $@
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cmd_vdso_install = cp $(obj)/$@.dbg $(MODLIB)/vdso/$@
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vdso-ilp32.so: $(obj)/vdso-ilp32.so.dbg
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@mkdir -p $(MODLIB)/vdso
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$(call cmd,vdso_install)
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vdso_install: vdso-ilp32.so
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