80 lines
2.0 KiB
Makefile
80 lines
2.0 KiB
Makefile
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# SPDX-License-Identifier: GPL-2.0-only
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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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obj-vdso := note.o datapage.o sigreturn.o gettimeofday.o
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# Build rules
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targets := $(obj-vdso) vdso.so vdso.so.dbg
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obj-vdso := $(addprefix $(obj)/, $(obj-vdso))
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ccflags-y := -shared -fno-common -fno-builtin -nostdlib -fPIC -Wl,-shared -g \
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-Wl,-soname=linux-vdso.so.1 -Wl,--hash-style=sysv
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# Disable gcov profiling for VDSO code
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GCOV_PROFILE := n
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obj-y += vdso.o
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extra-y += vdso.lds
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CPPFLAGS_vdso.lds += -P -C -U$(ARCH)
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# Force dependency
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$(obj)/vdso.o : $(obj)/vdso.so
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# Link rule for the .so file, .lds has to be first
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$(obj)/vdso.so.dbg: $(obj)/vdso.lds $(obj-vdso) FORCE
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$(call if_changed,vdsold)
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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)/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-offsets.h: $(obj)/vdso.so.dbg FORCE
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$(call if_changed,vdsosym)
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# Assembly rules for the .S files
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sigreturn.o : sigreturn.S
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$(call if_changed_dep,vdsoas)
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note.o : note.S
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$(call if_changed_dep,vdsoas)
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datapage.o : datapage.S
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$(call if_changed_dep,vdsoas)
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gettimeofday.o : gettimeofday.c FORCE
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$(call if_changed_dep,vdsocc)
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# Actual build commands
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quiet_cmd_vdsold = VDSOL $@
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cmd_vdsold = $(CC) $(c_flags) -Wl,-n -Wl,-T $(real-prereqs) -o $@
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quiet_cmd_vdsoas = VDSOA $@
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cmd_vdsoas = $(CC) $(a_flags) -c -o $@ $<
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quiet_cmd_vdsocc = VDSOA $@
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cmd_vdsocc = $(CC) $(c_flags) -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.so: $(obj)/vdso.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.so
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