1# SPDX-License-Identifier: GPL-2.0 2# Symbols present in the vdso 3vdso-syms = rt_sigreturn gettimeofday 4 5# Files to link into the vdso 6obj-vdso = $(patsubst %, v%.o, $(vdso-syms)) 7 8# Build rules 9targets := $(obj-vdso) vdso.so vdso.so.dbg vdso.lds vdso-dummy.o 10obj-vdso := $(addprefix $(obj)/, $(obj-vdso)) 11 12# vdso32 is only for tilegx -m32 compat task. 13VDSO32-$(CONFIG_COMPAT) := y 14 15obj-y += vdso.o vdso-syms.o 16obj-$(VDSO32-y) += vdso32.o 17CPPFLAGS_vdso.lds += -P -C -U$(ARCH) 18 19# vDSO code runs in userspace and -pg doesn't help with profiling anyway. 20CFLAGS_REMOVE_vdso.o = -pg 21CFLAGS_REMOVE_vdso32.o = -pg 22CFLAGS_REMOVE_vrt_sigreturn.o = -pg 23CFLAGS_REMOVE_vrt_sigreturn32.o = -pg 24CFLAGS_REMOVE_vgettimeofday.o = -pg 25CFLAGS_REMOVE_vgettimeofday32.o = -pg 26 27ifdef CONFIG_FEEDBACK_COLLECT 28# vDSO code runs in userspace, not collecting feedback data. 29CFLAGS_REMOVE_vdso.o = -ffeedback-generate 30CFLAGS_REMOVE_vdso32.o = -ffeedback-generate 31CFLAGS_REMOVE_vrt_sigreturn.o = -ffeedback-generate 32CFLAGS_REMOVE_vrt_sigreturn32.o = -ffeedback-generate 33CFLAGS_REMOVE_vgettimeofday.o = -ffeedback-generate 34CFLAGS_REMOVE_vgettimeofday32.o = -ffeedback-generate 35endif 36 37# Disable gcov profiling for VDSO code 38GCOV_PROFILE := n 39 40# Force dependency 41$(obj)/vdso.o: $(obj)/vdso.so 42 43# link rule for the .so file, .lds has to be first 44SYSCFLAGS_vdso.so.dbg = $(c_flags) 45$(obj)/vdso.so.dbg: $(src)/vdso.lds $(obj-vdso) FORCE 46 $(call if_changed,vdsold) 47 48# We also create a special relocatable object that should mirror the symbol 49# table and layout of the linked DSO. With ld -R we can then refer to 50# these symbols in the kernel code rather than hand-coded addresses. 51 52SYSCFLAGS_vdso.so.dbg = -shared -s -Wl,-soname=linux-vdso.so.1 \ 53 $(call cc-ldoption, -Wl$(comma)--hash-style=both) 54SYSCFLAGS_vdso_dummy.o = -r 55$(obj)/vdso-dummy.o: $(src)/vdso.lds $(obj)/vrt_sigreturn.o FORCE 56 $(call if_changed,vdsold) 57 58LDFLAGS_vdso-syms.o := -r -R 59$(obj)/vdso-syms.o: $(obj)/vdso-dummy.o FORCE 60 $(call if_changed,ld) 61 62# strip rule for the .so file 63$(obj)/%.so: OBJCOPYFLAGS := -S 64$(obj)/%.so: $(obj)/%.so.dbg FORCE 65 $(call if_changed,objcopy) 66 67# actual build commands 68# The DSO images are built using a special linker script 69# Add -lgcc so tilepro gets static muldi3 and lshrdi3 definitions. 70# Make sure only to export the intended __vdso_xxx symbol offsets. 71quiet_cmd_vdsold = VDSOLD $@ 72 cmd_vdsold = $(CC) $(KCFLAGS) -nostdlib $(SYSCFLAGS_$(@F)) \ 73 -Wl,-T,$(filter-out FORCE,$^) -o $@.tmp -lgcc && \ 74 $(CROSS_COMPILE)objcopy \ 75 $(patsubst %, -G __vdso_%, $(vdso-syms)) $@.tmp $@ 76 77# install commands for the unstripped file 78quiet_cmd_vdso_install = INSTALL $@ 79 cmd_vdso_install = cp $(obj)/$@.dbg $(MODLIB)/vdso/$@ 80 81vdso.so: $(obj)/vdso.so.dbg 82 @mkdir -p $(MODLIB)/vdso 83 $(call cmd,vdso_install) 84 85vdso32.so: $(obj)/vdso32.so.dbg 86 $(call cmd,vdso_install) 87 88vdso_install: vdso.so 89vdso32_install: vdso32.so 90 91 92KBUILD_AFLAGS_32 := $(filter-out -m64,$(KBUILD_AFLAGS)) 93KBUILD_AFLAGS_32 += -m32 -s 94KBUILD_CFLAGS_32 := $(filter-out -m64,$(KBUILD_CFLAGS)) 95KBUILD_CFLAGS_32 += -m32 -fPIC -shared 96 97obj-vdso32 = $(patsubst %, v%32.o, $(vdso-syms)) 98 99targets += $(obj-vdso32) vdso32.so vdso32.so.dbg 100obj-vdso32 := $(addprefix $(obj)/, $(obj-vdso32)) 101 102$(obj-vdso32:%=%): KBUILD_AFLAGS = $(KBUILD_AFLAGS_32) 103$(obj-vdso32:%=%): KBUILD_CFLAGS = $(KBUILD_CFLAGS_32) 104 105$(obj)/vgettimeofday32.o: $(obj)/vgettimeofday.c FORCE 106 $(call if_changed_rule,cc_o_c) 107 108$(obj)/vrt_sigreturn32.o: $(obj)/vrt_sigreturn.S FORCE 109 $(call if_changed,as_o_S) 110 111# Force dependency 112$(obj)/vdso32.o: $(obj)/vdso32.so 113 114SYSCFLAGS_vdso32.so.dbg = -m32 -shared -s -Wl,-soname=linux-vdso32.so.1 \ 115 $(call cc-ldoption, -Wl$(comma)--hash-style=both) 116$(obj)/vdso32.so.dbg: $(src)/vdso.lds $(obj-vdso32) FORCE 117 $(call if_changed,vdsold) 118