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79 lines
2.0 KiB
79 lines
2.0 KiB
# 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 <[email protected]> |
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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)/, $(obj-vdso)) |
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ccflags-y := -shared -fno-common -fno-builtin -nostdlib -fPIC -Wl,-shared -g \ |
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-Wl,-soname=linux-vdso.so.1 -Wl,--hash-style=sysv |
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# Disable gcov profiling for VDSO code |
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GCOV_PROFILE := n |
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obj-y += vdso.o |
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targets += vdso.lds |
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CPPFLAGS_vdso.lds += -P -C -U$(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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