| # Symbols present in the vdso |
| vdso-syms = rt_sigreturn gettimeofday |
| |
| # Files to link into the vdso |
| obj-vdso = $(patsubst %, v%.o, $(vdso-syms)) |
| |
| # Build rules |
| targets := $(obj-vdso) vdso.so vdso.so.dbg vdso.lds |
| obj-vdso := $(addprefix $(obj)/, $(obj-vdso)) |
| |
| # vdso32 is only for tilegx -m32 compat task. |
| VDSO32-$(CONFIG_COMPAT) := y |
| |
| obj-y += vdso.o |
| obj-$(VDSO32-y) += vdso32.o |
| extra-y += vdso.lds |
| CPPFLAGS_vdso.lds += -P -C -U$(ARCH) |
| |
| # vDSO code runs in userspace and -pg doesn't help with profiling anyway. |
| CFLAGS_REMOVE_vdso.o = -pg |
| CFLAGS_REMOVE_vdso32.o = -pg |
| CFLAGS_REMOVE_vrt_sigreturn.o = -pg |
| CFLAGS_REMOVE_vrt_sigreturn32.o = -pg |
| CFLAGS_REMOVE_vgettimeofday.o = -pg |
| CFLAGS_REMOVE_vgettimeofday32.o = -pg |
| |
| ifdef CONFIG_FEEDBACK_COLLECT |
| # vDSO code runs in userspace, not collecting feedback data. |
| CFLAGS_REMOVE_vdso.o = -ffeedback-generate |
| CFLAGS_REMOVE_vdso32.o = -ffeedback-generate |
| CFLAGS_REMOVE_vrt_sigreturn.o = -ffeedback-generate |
| CFLAGS_REMOVE_vrt_sigreturn32.o = -ffeedback-generate |
| CFLAGS_REMOVE_vgettimeofday.o = -ffeedback-generate |
| CFLAGS_REMOVE_vgettimeofday32.o = -ffeedback-generate |
| endif |
| |
| # Disable gcov profiling for VDSO code |
| GCOV_PROFILE := n |
| |
| # Force dependency |
| $(obj)/vdso.o: $(obj)/vdso.so |
| |
| # link rule for the .so file, .lds has to be first |
| SYSCFLAGS_vdso.so.dbg = $(c_flags) |
| $(obj)/vdso.so.dbg: $(src)/vdso.lds $(obj-vdso) |
| $(call if_changed,vdsold) |
| |
| |
| # We also create a special relocatable object that should mirror the symbol |
| # table and layout of the linked DSO. With ld -R we can then refer to |
| # these symbols in the kernel code rather than hand-coded addresses. |
| extra-y += vdso-syms.o |
| $(obj)/built-in.o: $(obj)/vdso-syms.o |
| $(obj)/built-in.o: ld_flags += -R $(obj)/vdso-syms.o |
| |
| SYSCFLAGS_vdso.so.dbg = -shared -s -Wl,-soname=linux-vdso.so.1 \ |
| $(call cc-ldoption, -Wl$(comma)--hash-style=sysv) |
| SYSCFLAGS_vdso_syms.o = -r |
| $(obj)/vdso-syms.o: $(src)/vdso.lds $(obj)/vrt_sigreturn.o FORCE |
| $(call if_changed,vdsold) |
| |
| |
| # strip rule for the .so file |
| $(obj)/%.so: OBJCOPYFLAGS := -S |
| $(obj)/%.so: $(obj)/%.so.dbg FORCE |
| $(call if_changed,objcopy) |
| |
| # actual build commands |
| # The DSO images are built using a special linker script |
| # Add -lgcc so tilepro gets static muldi3 and lshrdi3 definitions. |
| # Make sure only to export the intended __vdso_xxx symbol offsets. |
| quiet_cmd_vdsold = VDSOLD $@ |
| cmd_vdsold = $(CC) $(KCFLAGS) -nostdlib $(SYSCFLAGS_$(@F)) \ |
| -Wl,-T,$(filter-out FORCE,$^) -o $@.tmp -lgcc && \ |
| $(CROSS_COMPILE)objcopy \ |
| $(patsubst %, -G __vdso_%, $(vdso-syms)) $@.tmp $@ |
| |
| # install commands for the unstripped file |
| quiet_cmd_vdso_install = INSTALL $@ |
| cmd_vdso_install = cp $(obj)/$@.dbg $(MODLIB)/vdso/$@ |
| |
| vdso.so: $(obj)/vdso.so.dbg |
| @mkdir -p $(MODLIB)/vdso |
| $(call cmd,vdso_install) |
| |
| vdso32.so: $(obj)/vdso32.so.dbg |
| $(call cmd,vdso_install) |
| |
| vdso_install: vdso.so |
| vdso32_install: vdso32.so |
| |
| |
| KBUILD_AFLAGS_32 := $(filter-out -m64,$(KBUILD_AFLAGS)) |
| KBUILD_AFLAGS_32 += -m32 -s |
| KBUILD_CFLAGS_32 := $(filter-out -m64,$(KBUILD_CFLAGS)) |
| KBUILD_CFLAGS_32 += -m32 -fPIC -shared |
| |
| obj-vdso32 = $(patsubst %, v%32.o, $(vdso-syms)) |
| obj-vdso32 := $(addprefix $(obj)/, $(obj-vdso32)) |
| |
| targets += $(obj-vdso32) vdso32.so vdso32.so.dbg |
| |
| $(obj-vdso32:%=%): KBUILD_AFLAGS = $(KBUILD_AFLAGS_32) |
| $(obj-vdso32:%=%): KBUILD_CFLAGS = $(KBUILD_CFLAGS_32) |
| |
| $(obj)/vgettimeofday32.o: $(obj)/vgettimeofday.c |
| $(call if_changed,cc_o_c) |
| |
| $(obj)/vrt_sigreturn32.o: $(obj)/vrt_sigreturn.S |
| $(call if_changed,as_o_S) |
| |
| # Force dependency |
| $(obj)/vdso32.o: $(obj)/vdso32.so |
| |
| SYSCFLAGS_vdso32.so.dbg = -m32 -shared -s -Wl,-soname=linux-vdso32.so.1 \ |
| $(call cc-ldoption, -Wl$(comma)--hash-style=sysv) |
| $(obj)/vdso32.so.dbg: $(src)/vdso.lds $(obj-vdso32) |
| $(call if_changed,vdsold) |