119 lines
3.7 KiB
Makefile
119 lines
3.7 KiB
Makefile
# 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
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obj-vdso := $(addprefix $(obj)/, $(obj-vdso))
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# vdso32 is only for tilegx -m32 compat task.
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VDSO32-$(CONFIG_COMPAT) := y
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obj-y += vdso.o
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obj-$(VDSO32-y) += vdso32.o
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extra-y += vdso.lds
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CPPFLAGS_vdso.lds += -P -C -U$(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_vdso32.o = -pg
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CFLAGS_REMOVE_vrt_sigreturn.o = -pg
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CFLAGS_REMOVE_vrt_sigreturn32.o = -pg
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CFLAGS_REMOVE_vgettimeofday.o = -pg
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CFLAGS_REMOVE_vgettimeofday32.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_vdso32.o = -ffeedback-generate
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CFLAGS_REMOVE_vrt_sigreturn.o = -ffeedback-generate
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CFLAGS_REMOVE_vrt_sigreturn32.o = -ffeedback-generate
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CFLAGS_REMOVE_vgettimeofday.o = -ffeedback-generate
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CFLAGS_REMOVE_vgettimeofday32.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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# We also create a special relocatable object that should mirror the symbol
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# table and layout of the linked DSO. With ld -R we can then refer to
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# these symbols in the kernel code rather than hand-coded addresses.
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extra-y += vdso-syms.o
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$(obj)/built-in.o: $(obj)/vdso-syms.o
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$(obj)/built-in.o: ld_flags += -R $(obj)/vdso-syms.o
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SYSCFLAGS_vdso.so.dbg = -shared -s -Wl,-soname=linux-vdso.so.1 \
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$(call cc-ldoption, -Wl$(comma)--hash-style=sysv)
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SYSCFLAGS_vdso_syms.o = -r
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$(obj)/vdso-syms.o: $(src)/vdso.lds $(obj)/vrt_sigreturn.o FORCE
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$(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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# 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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# 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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vdso32.so: $(obj)/vdso32.so.dbg
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$(call cmd,vdso_install)
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vdso_install: vdso.so
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vdso32_install: vdso32.so
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KBUILD_AFLAGS_32 := $(filter-out -m64,$(KBUILD_AFLAGS))
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KBUILD_AFLAGS_32 += -m32 -s
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KBUILD_CFLAGS_32 := $(filter-out -m64,$(KBUILD_CFLAGS))
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KBUILD_CFLAGS_32 += -m32 -fPIC -shared
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obj-vdso32 = $(patsubst %, v%32.o, $(vdso-syms))
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obj-vdso32 := $(addprefix $(obj)/, $(obj-vdso32))
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targets += $(obj-vdso32) vdso32.so vdso32.so.dbg
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$(obj-vdso32:%=%): KBUILD_AFLAGS = $(KBUILD_AFLAGS_32)
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$(obj-vdso32:%=%): KBUILD_CFLAGS = $(KBUILD_CFLAGS_32)
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$(obj)/vgettimeofday32.o: $(obj)/vgettimeofday.c
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$(call if_changed,cc_o_c)
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$(obj)/vrt_sigreturn32.o: $(obj)/vrt_sigreturn.S
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$(call if_changed,as_o_S)
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# Force dependency
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$(obj)/vdso32.o: $(obj)/vdso32.so
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SYSCFLAGS_vdso32.so.dbg = -m32 -shared -s -Wl,-soname=linux-vdso32.so.1 \
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$(call cc-ldoption, -Wl$(comma)--hash-style=sysv)
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$(obj)/vdso32.so.dbg: $(src)/vdso.lds $(obj-vdso32)
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$(call if_changed,vdsold)
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