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Andi Kleen2aae9502007-07-21 17:10:01 +02001#
Roland McGrath0249c9c2008-01-30 13:30:42 +01002# Building vDSO images for x86.
Andi Kleen2aae9502007-07-21 17:10:01 +02003#
4
Andi Kleen67424d52014-02-08 09:01:05 +01005KBUILD_CFLAGS += $(DISABLE_LTO)
Andrey Ryabininef7f0d62015-02-13 14:39:25 -08006KASAN_SANITIZE := n
Andrey Ryabininc6d30852016-01-20 15:00:55 -08007UBSAN_SANITIZE := n
Andi Kleen67424d52014-02-08 09:01:05 +01008
Roland McGrath0249c9c2008-01-30 13:30:42 +01009VDSO64-$(CONFIG_X86_64) := y
H. J. Lu1a21d4e2012-02-19 11:38:06 -080010VDSOX32-$(CONFIG_X86_X32_ABI) := y
Roland McGrath0249c9c2008-01-30 13:30:42 +010011VDSO32-$(CONFIG_X86_32) := y
Brian Gerstab8b82ee62015-06-22 07:55:15 -040012VDSO32-$(CONFIG_IA32_EMULATION) := y
Roland McGrath0249c9c2008-01-30 13:30:42 +010013
Andi Kleen2aae9502007-07-21 17:10:01 +020014# files to link into the vdso
Andy Lutomirskida861e12014-07-10 18:13:16 -070015vobjs-y := vdso-note.o vclock_gettime.o vgetcpu.o
H. J. Lu1a21d4e2012-02-19 11:38:06 -080016
Andi Kleen2aae9502007-07-21 17:10:01 +020017# files to link into kernel
Andy Lutomirskib4b541a2014-03-17 23:22:08 +010018obj-y += vma.o
Andy Lutomirski6f121e52014-05-05 12:19:34 -070019
20# vDSO images to build
21vdso_img-$(VDSO64-y) += 64
22vdso_img-$(VDSOX32-y) += x32
Andy Lutomirski0a6d1fa2015-10-05 17:47:56 -070023vdso_img-$(VDSO32-y) += 32
Andy Lutomirski6f121e52014-05-05 12:19:34 -070024
25obj-$(VDSO32-y) += vdso32-setup.o
Andi Kleen2aae9502007-07-21 17:10:01 +020026
Andy Lutomirskie0bf7b82014-06-12 17:53:12 -070027vobjs := $(foreach F,$(vobjs-y),$(obj)/$F)
Andi Kleen2aae9502007-07-21 17:10:01 +020028
29$(obj)/vdso.o: $(obj)/vdso.so
30
Andy Lutomirski6f121e52014-05-05 12:19:34 -070031targets += vdso.lds $(vobjs-y)
32
33# Build the vDSO image C files and link them in.
34vdso_img_objs := $(vdso_img-y:%=vdso-image-%.o)
35vdso_img_cfiles := $(vdso_img-y:%=vdso-image-%.c)
36vdso_img_sodbg := $(vdso_img-y:%=vdso%.so.dbg)
37obj-y += $(vdso_img_objs)
38targets += $(vdso_img_cfiles)
39targets += $(vdso_img_sodbg)
Andy Lutomirskida861e12014-07-10 18:13:16 -070040.SECONDARY: $(vdso_img-y:%=$(obj)/vdso-image-%.c) \
41 $(vdso_img-y:%=$(obj)/vdso%.so)
Andi Kleen2aae9502007-07-21 17:10:01 +020042
Sam Ravnborgd746d642007-11-12 20:14:19 +010043export CPPFLAGS_vdso.lds += -P -C
Andi Kleen2aae9502007-07-21 17:10:01 +020044
H. Peter Anvinde2a8cf2010-12-13 16:01:38 -080045VDSO_LDFLAGS_vdso.lds = -m64 -Wl,-soname=linux-vdso.so.1 \
Andy Lutomirski7f79ad12011-07-13 09:24:12 -040046 -Wl,--no-undefined \
Andi Kleen67424d52014-02-08 09:01:05 +010047 -Wl,-z,max-page-size=4096 -Wl,-z,common-page-size=4096 \
48 $(DISABLE_LTO)
Andi Kleen2aae9502007-07-21 17:10:01 +020049
Andy Lutomirski6f121e52014-05-05 12:19:34 -070050$(obj)/vdso64.so.dbg: $(src)/vdso.lds $(vobjs) FORCE
Roland McGrath16e48e72008-01-30 13:30:44 +010051 $(call if_changed,vdso)
Andi Kleen2aae9502007-07-21 17:10:01 +020052
Oleg Nesterovef7254a52015-05-11 10:15:50 +020053HOST_EXTRACFLAGS += -I$(srctree)/tools/include -I$(srctree)/include/uapi -I$(srctree)/arch/x86/include/uapi
Andy Lutomirski6f121e52014-05-05 12:19:34 -070054hostprogs-y += vdso2c
55
56quiet_cmd_vdso2c = VDSO2C $@
57define cmd_vdso2c
Andy Lutomirskida861e12014-07-10 18:13:16 -070058 $(obj)/vdso2c $< $(<:%.dbg=%) $@
Andy Lutomirski6f121e52014-05-05 12:19:34 -070059endef
60
Andy Lutomirskida861e12014-07-10 18:13:16 -070061$(obj)/vdso-image-%.c: $(obj)/vdso%.so.dbg $(obj)/vdso%.so $(obj)/vdso2c FORCE
Andy Lutomirski6f121e52014-05-05 12:19:34 -070062 $(call if_changed,vdso2c)
Roland McGrathf79eb832007-10-17 18:04:32 +020063
Andy Lutomirski6447fac2011-05-23 09:31:29 -040064#
65# Don't omit frame pointers for ease of userspace debugging, but do
66# optimize sibling calls.
67#
Roland McGrath8705a492008-04-14 12:19:30 -070068CFL := $(PROFILING) -mcmodel=small -fPIC -O2 -fasynchronous-unwind-tables -m64 \
Andy Lutomirski6447fac2011-05-23 09:31:29 -040069 $(filter -g%,$(KBUILD_CFLAGS)) $(call cc-option, -fno-stack-protector) \
Andy Lutomirski46b57a72014-06-24 13:46:52 -070070 -fno-omit-frame-pointer -foptimize-sibling-calls \
Andy Lutomirskif24f9102015-10-05 17:47:58 -070071 -DDISABLE_BRANCH_PROFILING -DBUILD_VDSO
Andi Kleen2aae9502007-07-21 17:10:01 +020072
Glauber de Oliveira Costaf6bc4022008-03-19 14:25:53 -030073$(vobjs): KBUILD_CFLAGS += $(CFL)
Andi Kleen2aae9502007-07-21 17:10:01 +020074
Andy Lutomirski6447fac2011-05-23 09:31:29 -040075#
76# vDSO code runs in userspace and -pg doesn't help with profiling anyway.
77#
78CFLAGS_REMOVE_vdso-note.o = -pg
79CFLAGS_REMOVE_vclock_gettime.o = -pg
80CFLAGS_REMOVE_vgetcpu.o = -pg
81CFLAGS_REMOVE_vvar.o = -pg
82
Roland McGrath0249c9c2008-01-30 13:30:42 +010083#
H. J. Lu1a21d4e2012-02-19 11:38:06 -080084# X32 processes use x32 vDSO to access 64bit kernel data.
85#
86# Build x32 vDSO image:
87# 1. Compile x32 vDSO as 64bit.
88# 2. Convert object files to x32.
89# 3. Build x32 VDSO image with x32 objects, which contains 64bit codes
90# so that it can reach 64bit address space with 64bit pointers.
91#
92
H. J. Lu1a21d4e2012-02-19 11:38:06 -080093CPPFLAGS_vdsox32.lds = $(CPPFLAGS_vdso.lds)
94VDSO_LDFLAGS_vdsox32.lds = -Wl,-m,elf32_x86_64 \
95 -Wl,-soname=linux-vdso.so.1 \
96 -Wl,-z,max-page-size=4096 \
97 -Wl,-z,common-page-size=4096
98
Andy Lutomirskie0bf7b82014-06-12 17:53:12 -070099# 64-bit objects to re-brand as x32
100vobjs64-for-x32 := $(filter-out $(vobjs-nox32),$(vobjs-y))
101
102# x32-rebranded versions
103vobjx32s-y := $(vobjs64-for-x32:.o=-x32.o)
104
105# same thing, but in the output directory
H. J. Lu1a21d4e2012-02-19 11:38:06 -0800106vobjx32s := $(foreach F,$(vobjx32s-y),$(obj)/$F)
107
108# Convert 64bit object file to x32 for x32 vDSO.
109quiet_cmd_x32 = X32 $@
110 cmd_x32 = $(OBJCOPY) -O elf32-x86-64 $< $@
111
112$(obj)/%-x32.o: $(obj)/%.o FORCE
113 $(call if_changed,x32)
114
Andy Lutomirski6f121e52014-05-05 12:19:34 -0700115targets += vdsox32.lds $(vobjx32s-y)
H. J. Lu1a21d4e2012-02-19 11:38:06 -0800116
Andy Lutomirskida861e12014-07-10 18:13:16 -0700117$(obj)/%.so: OBJCOPYFLAGS := -S
118$(obj)/%.so: $(obj)/%.so.dbg
119 $(call if_changed,objcopy)
120
H. J. Lu1a21d4e2012-02-19 11:38:06 -0800121$(obj)/vdsox32.so.dbg: $(src)/vdsox32.lds $(vobjx32s) FORCE
122 $(call if_changed,vdso)
123
Roland McGrath0249c9c2008-01-30 13:30:42 +0100124CPPFLAGS_vdso32.lds = $(CPPFLAGS_vdso.lds)
Andi Kleen67424d52014-02-08 09:01:05 +0100125VDSO_LDFLAGS_vdso32.lds = -m32 -Wl,-m,elf_i386 -Wl,-soname=linux-gate.so.1
Roland McGrath0249c9c2008-01-30 13:30:42 +0100126
127# This makes sure the $(obj) subdirectory exists even though vdso32/
128# is not a kbuild sub-make subdirectory.
129override obj-dirs = $(dir $(obj)) $(obj)/vdso32/
130
131targets += vdso32/vdso32.lds
Andy Lutomirski0a6d1fa2015-10-05 17:47:56 -0700132targets += vdso32/note.o vdso32/vclock_gettime.o vdso32/system_call.o
Andy Lutomirskida861e12014-07-10 18:13:16 -0700133targets += vdso32/vclock_gettime.o
Roland McGrath0249c9c2008-01-30 13:30:42 +0100134
Andy Lutomirskif24f9102015-10-05 17:47:58 -0700135KBUILD_AFLAGS_32 := $(filter-out -m64,$(KBUILD_AFLAGS)) -DBUILD_VDSO
Andy Lutomirski0a6d1fa2015-10-05 17:47:56 -0700136$(obj)/vdso32.so.dbg: KBUILD_AFLAGS = $(KBUILD_AFLAGS_32)
137$(obj)/vdso32.so.dbg: asflags-$(CONFIG_X86_64) += -m32
Roland McGrath0249c9c2008-01-30 13:30:42 +0100138
Stefani Seibold7a59ed42014-03-17 23:22:09 +0100139KBUILD_CFLAGS_32 := $(filter-out -m64,$(KBUILD_CFLAGS))
140KBUILD_CFLAGS_32 := $(filter-out -mcmodel=kernel,$(KBUILD_CFLAGS_32))
141KBUILD_CFLAGS_32 := $(filter-out -fno-pic,$(KBUILD_CFLAGS_32))
142KBUILD_CFLAGS_32 := $(filter-out -mfentry,$(KBUILD_CFLAGS_32))
143KBUILD_CFLAGS_32 += -m32 -msoft-float -mregparm=0 -fpic
H. Peter Anvin008cc902014-03-17 23:22:12 +0100144KBUILD_CFLAGS_32 += $(call cc-option, -fno-stack-protector)
145KBUILD_CFLAGS_32 += $(call cc-option, -foptimize-sibling-calls)
146KBUILD_CFLAGS_32 += -fno-omit-frame-pointer
Andy Lutomirski46b57a72014-06-24 13:46:52 -0700147KBUILD_CFLAGS_32 += -DDISABLE_BRANCH_PROFILING
Andy Lutomirski0a6d1fa2015-10-05 17:47:56 -0700148$(obj)/vdso32.so.dbg: KBUILD_CFLAGS = $(KBUILD_CFLAGS_32)
Stefani Seibold7a59ed42014-03-17 23:22:09 +0100149
Andy Lutomirski0a6d1fa2015-10-05 17:47:56 -0700150$(obj)/vdso32.so.dbg: FORCE \
151 $(obj)/vdso32/vdso32.lds \
152 $(obj)/vdso32/vclock_gettime.o \
153 $(obj)/vdso32/note.o \
154 $(obj)/vdso32/system_call.o
Roland McGrath0249c9c2008-01-30 13:30:42 +0100155 $(call if_changed,vdso)
156
Roland McGrath0249c9c2008-01-30 13:30:42 +0100157#
158# The DSO images are built using a special linker script.
159#
160quiet_cmd_vdso = VDSO $@
161 cmd_vdso = $(CC) -nostdlib -o $@ \
162 $(VDSO_LDFLAGS) $(VDSO_LDFLAGS_$(filter %.lds,$(^F))) \
H. Peter Anvin05d0b082010-06-18 14:36:26 -0700163 -Wl,-T,$(filter %.lds,$^) $(filter %.o,$^) && \
164 sh $(srctree)/$(src)/checkundef.sh '$(NM)' '$@'
Roland McGrath0249c9c2008-01-30 13:30:42 +0100165
Andy Lutomirski6b7e2652015-08-06 14:45:45 -0700166VDSO_LDFLAGS = -fPIC -shared $(call cc-ldoption, -Wl$(comma)--hash-style=both) \
Andy Lutomirskidda1e952014-06-20 12:20:44 -0700167 $(call cc-ldoption, -Wl$(comma)--build-id) -Wl,-Bsymbolic $(LTO_CFLAGS)
Peter Oberparleiter7bf99fb2009-06-17 16:28:09 -0700168GCOV_PROFILE := n
Roland McGrath0249c9c2008-01-30 13:30:42 +0100169
170#
Andy Lutomirskidda1e952014-06-20 12:20:44 -0700171# Install the unstripped copies of vdso*.so. If our toolchain supports
172# build-id, install .build-id links as well.
Roland McGrath0249c9c2008-01-30 13:30:42 +0100173#
Andy Lutomirskia934fb52014-06-12 08:28:10 -0700174quiet_cmd_vdso_install = INSTALL $(@:install_%=%)
Andy Lutomirskidda1e952014-06-20 12:20:44 -0700175define cmd_vdso_install
176 cp $< "$(MODLIB)/vdso/$(@:install_%=%)"; \
177 if readelf -n $< |grep -q 'Build ID'; then \
178 buildid=`readelf -n $< |grep 'Build ID' |sed -e 's/^.*Build ID: \(.*\)$$/\1/'`; \
179 first=`echo $$buildid | cut -b-2`; \
180 last=`echo $$buildid | cut -b3-`; \
181 mkdir -p "$(MODLIB)/vdso/.build-id/$$first"; \
182 ln -sf "../../$(@:install_%=%)" "$(MODLIB)/vdso/.build-id/$$first/$$last.debug"; \
183 fi
184endef
Andy Lutomirskia934fb52014-06-12 08:28:10 -0700185
186vdso_img_insttargets := $(vdso_img_sodbg:%.dbg=install_%)
187
188$(MODLIB)/vdso: FORCE
Roland McGrathf79eb832007-10-17 18:04:32 +0200189 @mkdir -p $(MODLIB)/vdso
Andy Lutomirskia934fb52014-06-12 08:28:10 -0700190
191$(vdso_img_insttargets): install_%: $(obj)/%.dbg $(MODLIB)/vdso FORCE
Roland McGrathf79eb832007-10-17 18:04:32 +0200192 $(call cmd,vdso_install)
193
Andy Lutomirskia934fb52014-06-12 08:28:10 -0700194PHONY += vdso_install $(vdso_img_insttargets)
195vdso_install: $(vdso_img_insttargets) FORCE
Sam Ravnborgd531b4f2008-01-30 13:32:27 +0100196
Andy Lutomirski0a6d1fa2015-10-05 17:47:56 -0700197clean-files := vdso32.so vdso32.so.dbg vdso64* vdso-image-*.c vdsox32.so*