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b020632e40
Add a vdso to speed up gettimeofday and clock_getres/clock_gettime for CLOCK_REALTIME/CLOCK_MONOTONIC. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
56 lines
1.6 KiB
Makefile
56 lines
1.6 KiB
Makefile
# List of files in the vdso, has to be asm only for now
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obj-vdso32 = gettimeofday.o clock_getres.o clock_gettime.o note.o
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# Build rules
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targets := $(obj-vdso32) vdso32.so vdso32.so.dbg
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obj-vdso32 := $(addprefix $(obj)/, $(obj-vdso32))
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KBUILD_AFLAGS_31 := $(filter-out -m64,$(KBUILD_AFLAGS))
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KBUILD_AFLAGS_31 += -m31 -s
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KBUILD_CFLAGS_31 := $(filter-out -m64,$(KBUILD_CFLAGS))
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KBUILD_CFLAGS_31 += -m31 -fPIC -shared -fno-common -fno-builtin
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KBUILD_CFLAGS_31 += -nostdlib -Wl,-soname=linux-vdso32.so.1 \
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$(call ld-option, -Wl$(comma)--hash-style=sysv)
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$(targets:%=$(obj)/%.dbg): KBUILD_CFLAGS = $(KBUILD_CFLAGS_31)
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$(targets:%=$(obj)/%.dbg): KBUILD_AFLAGS = $(KBUILD_AFLAGS_31)
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obj-y += vdso32_wrapper.o
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extra-y += vdso32.lds
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CPPFLAGS_vdso32.lds += -P -C -U$(ARCH)
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# Force dependency (incbin is bad)
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$(obj)/vdso32_wrapper.o : $(obj)/vdso32.so
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# link rule for the .so file, .lds has to be first
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$(obj)/vdso32.so.dbg: $(src)/vdso32.lds $(obj-vdso32)
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$(call if_changed,vdso32ld)
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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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# assembly rules for the .S files
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$(obj-vdso32): %.o: %.S
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$(call if_changed_dep,vdso32as)
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# actual build commands
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quiet_cmd_vdso32ld = VDSO32L $@
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cmd_vdso32ld = $(CC) $(c_flags) -Wl,-T $^ -o $@
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quiet_cmd_vdso32as = VDSO32A $@
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cmd_vdso32as = $(CC) $(a_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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vdso32.so: $(obj)/vdso32.so.dbg
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@mkdir -p $(MODLIB)/vdso
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$(call cmd,vdso_install)
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vdso_install: vdso32.so
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