1#
2# Building vDSO images for sparc.
3#
4
5KBUILD_CFLAGS += $(DISABLE_LTO)
6
7VDSO64-$(CONFIG_SPARC64)	:= y
8VDSOCOMPAT-$(CONFIG_COMPAT)	:= y
9
10# files to link into the vdso
11vobjs-y := vdso-note.o vclock_gettime.o
12
13# files to link into kernel
14obj-y				+= vma.o
15
16# vDSO images to build
17vdso_img-$(VDSO64-y)		+= 64
18vdso_img-$(VDSOCOMPAT-y)	+= 32
19
20vobjs := $(foreach F,$(vobjs-y),$(obj)/$F)
21
22$(obj)/vdso.o: $(obj)/vdso.so
23
24targets += vdso.lds $(vobjs-y)
25
26# Build the vDSO image C files and link them in.
27vdso_img_objs := $(vdso_img-y:%=vdso-image-%.o)
28vdso_img_cfiles := $(vdso_img-y:%=vdso-image-%.c)
29vdso_img_sodbg := $(vdso_img-y:%=vdso%.so.dbg)
30obj-y += $(vdso_img_objs)
31targets += $(vdso_img_cfiles)
32targets += $(vdso_img_sodbg) $(vdso_img-y:%=vdso%.so)
33
34CPPFLAGS_vdso.lds += -P -C
35
36VDSO_LDFLAGS_vdso.lds = -m64 -Wl,-soname=linux-vdso.so.1 \
37			-Wl,--no-undefined \
38			-Wl,-z,max-page-size=8192 -Wl,-z,common-page-size=8192 \
39			$(DISABLE_LTO)
40
41$(obj)/vdso64.so.dbg: $(obj)/vdso.lds $(vobjs) FORCE
42	$(call if_changed,vdso)
43
44HOST_EXTRACFLAGS += -I$(srctree)/tools/include
45hostprogs-y			+= vdso2c
46
47quiet_cmd_vdso2c = VDSO2C  $@
48      cmd_vdso2c = $(obj)/vdso2c $< $(<:%.dbg=%) $@
49
50$(obj)/vdso-image-%.c: $(obj)/vdso%.so.dbg $(obj)/vdso%.so $(obj)/vdso2c FORCE
51	$(call if_changed,vdso2c)
52
53#
54# Don't omit frame pointers for ease of userspace debugging, but do
55# optimize sibling calls.
56#
57CFL := $(PROFILING) -mcmodel=medlow -fPIC -O2 -fasynchronous-unwind-tables \
58       -m64 -ffixed-g2 -ffixed-g3 -fcall-used-g4 -fcall-used-g5 -ffixed-g6 \
59       -ffixed-g7 $(filter -g%,$(KBUILD_CFLAGS)) \
60       $(call cc-option, -fno-stack-protector) -fno-omit-frame-pointer \
61       -foptimize-sibling-calls -DBUILD_VDSO
62
63$(vobjs): KBUILD_CFLAGS += $(CFL)
64
65#
66# vDSO code runs in userspace and -pg doesn't help with profiling anyway.
67#
68CFLAGS_REMOVE_vdso-note.o = -pg
69CFLAGS_REMOVE_vclock_gettime.o = -pg
70
71$(obj)/%.so: OBJCOPYFLAGS := -S
72$(obj)/%.so: $(obj)/%.so.dbg
73	$(call if_changed,objcopy)
74
75CPPFLAGS_vdso32.lds = $(CPPFLAGS_vdso.lds)
76VDSO_LDFLAGS_vdso32.lds = -m32 -Wl,-m,elf32_sparc,-soname=linux-gate.so.1
77
78#This makes sure the $(obj) subdirectory exists even though vdso32/
79#is not a kbuild sub-make subdirectory
80override obj-dirs = $(dir $(obj)) $(obj)/vdso32/
81
82targets += vdso32/vdso32.lds
83targets += vdso32/vdso-note.o
84targets += vdso32/vclock_gettime.o
85
86KBUILD_AFLAGS_32 := $(filter-out -m64,$(KBUILD_AFLAGS)) -DBUILD_VDSO
87$(obj)/vdso32.so.dbg: KBUILD_AFLAGS = $(KBUILD_AFLAGS_32)
88$(obj)/vdso32.so.dbg: asflags-$(CONFIG_SPARC64) += -m32
89
90KBUILD_CFLAGS_32 := $(filter-out -m64,$(KBUILD_CFLAGS))
91KBUILD_CFLAGS_32 := $(filter-out -mcmodel=medlow,$(KBUILD_CFLAGS_32))
92KBUILD_CFLAGS_32 := $(filter-out -fno-pic,$(KBUILD_CFLAGS_32))
93KBUILD_CFLAGS_32 := $(filter-out $(GCC_PLUGINS_CFLAGS),$(KBUILD_CFLAGS_32))
94KBUILD_CFLAGS_32 += -m32 -msoft-float -fpic -mno-app-regs -ffixed-g7
95KBUILD_CFLAGS_32 += $(call cc-option, -fno-stack-protector)
96KBUILD_CFLAGS_32 += $(call cc-option, -foptimize-sibling-calls)
97KBUILD_CFLAGS_32 += -fno-omit-frame-pointer
98KBUILD_CFLAGS_32 += -DDISABLE_BRANCH_PROFILING
99KBUILD_CFLAGS_32 += -mv8plus
100$(obj)/vdso32.so.dbg: KBUILD_CFLAGS = $(KBUILD_CFLAGS_32)
101
102$(obj)/vdso32.so.dbg: FORCE \
103			$(obj)/vdso32/vdso32.lds \
104			$(obj)/vdso32/vclock_gettime.o \
105			$(obj)/vdso32/vdso-note.o
106		$(call	if_changed,vdso)
107
108#
109# The DSO images are built using a special linker script.
110#
111quiet_cmd_vdso = VDSO    $@
112      cmd_vdso = $(CC) -nostdlib -o $@ \
113		       $(VDSO_LDFLAGS) $(VDSO_LDFLAGS_$(filter %.lds,$(^F))) \
114		       -Wl,-T,$(filter %.lds,$^) $(filter %.o,$^)
115
116VDSO_LDFLAGS = -fPIC -shared $(call cc-ldoption, -Wl$(comma)--hash-style=sysv) \
117	$(call cc-ldoption, -Wl$(comma)--build-id) -Wl,-Bsymbolic
118GCOV_PROFILE := n
119
120#
121# Install the unstripped copies of vdso*.so.  If our toolchain supports
122# build-id, install .build-id links as well.
123#
124quiet_cmd_vdso_install = INSTALL $(@:install_%=%)
125define cmd_vdso_install
126	cp $< "$(MODLIB)/vdso/$(@:install_%=%)"; \
127	if readelf -n $< |grep -q 'Build ID'; then \
128	  buildid=`readelf -n $< |grep 'Build ID' |sed -e 's/^.*Build ID: \(.*\)$$/\1/'`; \
129	  first=`echo $$buildid | cut -b-2`; \
130	  last=`echo $$buildid | cut -b3-`; \
131	  mkdir -p "$(MODLIB)/vdso/.build-id/$$first"; \
132	  ln -sf "../../$(@:install_%=%)" "$(MODLIB)/vdso/.build-id/$$first/$$last.debug"; \
133	fi
134endef
135
136vdso_img_insttargets := $(vdso_img_sodbg:%.dbg=install_%)
137
138$(MODLIB)/vdso: FORCE
139	@mkdir -p $(MODLIB)/vdso
140
141$(vdso_img_insttargets): install_%: $(obj)/%.dbg $(MODLIB)/vdso FORCE
142	$(call cmd,vdso_install)
143
144PHONY += vdso_install $(vdso_img_insttargets)
145vdso_install: $(vdso_img_insttargets) FORCE
146