75 lines
2.4 KiB
Makefile
75 lines
2.4 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0
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# Symbols present in the vdso
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vdso-syms = rt_sigreturn gettimeofday
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# Files to link into the vdso
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obj-vdso = $(patsubst %, v%.o, $(vdso-syms))
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# Build rules
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targets := $(obj-vdso) vdso.so vdso.so.dbg vdso.lds vdso-syms.S
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obj-vdso := $(addprefix $(obj)/, $(obj-vdso))
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obj-y += vdso.o vdso-syms.o
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extra-y += vdso.lds
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CPPFLAGS_vdso.lds += -P -C -U$(ARCH)
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# vDSO code runs in userspace and -pg doesn't help with profiling anyway.
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CFLAGS_REMOVE_vdso.o = -pg
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CFLAGS_REMOVE_vrt_sigreturn.o = -pg
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CFLAGS_REMOVE_vgettimeofday.o = -pg
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ifdef CONFIG_FEEDBACK_COLLECT
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# vDSO code runs in userspace, not collecting feedback data.
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CFLAGS_REMOVE_vdso.o = -ffeedback-generate
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CFLAGS_REMOVE_vrt_sigreturn.o = -ffeedback-generate
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CFLAGS_REMOVE_vgettimeofday.o = -ffeedback-generate
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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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# 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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SYSCFLAGS_vdso.so.dbg = $(c_flags)
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$(obj)/vdso.so.dbg: $(src)/vdso.lds $(obj-vdso)
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$(call if_changed,vdsold)
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SYSCFLAGS_vdso.so.dbg = -shared -s -Wl,-soname=linux-vdso.so.1 \
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$(call cc-ldoption, -Wl$(comma)--hash-style=both)
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$(obj)/vdso-syms.S: $(obj)/vdso.so FORCE
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$(call if_changed,so2s)
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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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# actual build commands
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# The DSO images are built using a special linker script
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# Add -lgcc so tilepro gets static muldi3 and lshrdi3 definitions.
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# Make sure only to export the intended __vdso_xxx symbol offsets.
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quiet_cmd_vdsold = VDSOLD $@
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cmd_vdsold = $(CC) $(KCFLAGS) -nostdlib $(SYSCFLAGS_$(@F)) \
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-Wl,-T,$(filter-out FORCE,$^) -o $@.tmp -lgcc && \
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$(CROSS_COMPILE)objcopy \
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$(patsubst %, -G __vdso_%, $(vdso-syms)) $@.tmp $@ && \
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rm $@.tmp
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# Extracts symbol offsets from the VDSO, converting them into an assembly file
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# that contains the same symbols at the same offsets.
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quiet_cmd_so2s = SO2S $@
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cmd_so2s = $(NM) -D $< | $(srctree)/$(src)/so2s.sh > $@
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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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