Merge branches 'pm-cpufreq', 'pm-cpuidle', 'pm-devfreq', 'pm-opp' and 'pm-tools'
[linux-drm-fsl-dcu.git] / arch / x86 / vdso / Makefile
1 #
2 # Building vDSO images for x86.
3 #
4
5 KBUILD_CFLAGS += $(DISABLE_LTO)
6
7 VDSO64-$(CONFIG_X86_64)         := y
8 VDSOX32-$(CONFIG_X86_X32_ABI)   := y
9 VDSO32-$(CONFIG_X86_32)         := y
10 VDSO32-$(CONFIG_COMPAT)         := y
11
12 # files to link into the vdso
13 vobjs-y := vdso-note.o vclock_gettime.o vgetcpu.o
14
15 # files to link into kernel
16 obj-y                           += vma.o
17
18 # vDSO images to build
19 vdso_img-$(VDSO64-y)            += 64
20 vdso_img-$(VDSOX32-y)           += x32
21 vdso_img-$(VDSO32-y)            += 32-int80
22 vdso_img-$(CONFIG_COMPAT)       += 32-syscall
23 vdso_img-$(VDSO32-y)            += 32-sysenter
24
25 obj-$(VDSO32-y)                 += vdso32-setup.o
26
27 vobjs := $(foreach F,$(vobjs-y),$(obj)/$F)
28
29 $(obj)/vdso.o: $(obj)/vdso.so
30
31 targets += vdso.lds $(vobjs-y)
32
33 # Build the vDSO image C files and link them in.
34 vdso_img_objs := $(vdso_img-y:%=vdso-image-%.o)
35 vdso_img_cfiles := $(vdso_img-y:%=vdso-image-%.c)
36 vdso_img_sodbg := $(vdso_img-y:%=vdso%.so.dbg)
37 obj-y += $(vdso_img_objs)
38 targets += $(vdso_img_cfiles)
39 targets += $(vdso_img_sodbg)
40 .SECONDARY: $(vdso_img-y:%=$(obj)/vdso-image-%.c) \
41         $(vdso_img-y:%=$(obj)/vdso%.so)
42
43 export CPPFLAGS_vdso.lds += -P -C
44
45 VDSO_LDFLAGS_vdso.lds = -m64 -Wl,-soname=linux-vdso.so.1 \
46                         -Wl,--no-undefined \
47                         -Wl,-z,max-page-size=4096 -Wl,-z,common-page-size=4096 \
48                         $(DISABLE_LTO)
49
50 $(obj)/vdso64.so.dbg: $(src)/vdso.lds $(vobjs) FORCE
51         $(call if_changed,vdso)
52
53 HOST_EXTRACFLAGS += -I$(srctree)/tools/include
54 hostprogs-y                     += vdso2c
55
56 quiet_cmd_vdso2c = VDSO2C  $@
57 define cmd_vdso2c
58         $(obj)/vdso2c $< $(<:%.dbg=%) $@
59 endef
60
61 $(obj)/vdso-image-%.c: $(obj)/vdso%.so.dbg $(obj)/vdso%.so $(obj)/vdso2c FORCE
62         $(call if_changed,vdso2c)
63
64 #
65 # Don't omit frame pointers for ease of userspace debugging, but do
66 # optimize sibling calls.
67 #
68 CFL := $(PROFILING) -mcmodel=small -fPIC -O2 -fasynchronous-unwind-tables -m64 \
69        $(filter -g%,$(KBUILD_CFLAGS)) $(call cc-option, -fno-stack-protector) \
70        -fno-omit-frame-pointer -foptimize-sibling-calls \
71        -DDISABLE_BRANCH_PROFILING
72
73 $(vobjs): KBUILD_CFLAGS += $(CFL)
74
75 #
76 # vDSO code runs in userspace and -pg doesn't help with profiling anyway.
77 #
78 CFLAGS_REMOVE_vdso-note.o = -pg
79 CFLAGS_REMOVE_vclock_gettime.o = -pg
80 CFLAGS_REMOVE_vgetcpu.o = -pg
81 CFLAGS_REMOVE_vvar.o = -pg
82
83 #
84 # 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
93 CPPFLAGS_vdsox32.lds = $(CPPFLAGS_vdso.lds)
94 VDSO_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
99 # 64-bit objects to re-brand as x32
100 vobjs64-for-x32 := $(filter-out $(vobjs-nox32),$(vobjs-y))
101
102 # x32-rebranded versions
103 vobjx32s-y := $(vobjs64-for-x32:.o=-x32.o)
104
105 # same thing, but in the output directory
106 vobjx32s := $(foreach F,$(vobjx32s-y),$(obj)/$F)
107
108 # Convert 64bit object file to x32 for x32 vDSO.
109 quiet_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
115 targets += vdsox32.lds $(vobjx32s-y)
116
117 $(obj)/%.so: OBJCOPYFLAGS := -S
118 $(obj)/%.so: $(obj)/%.so.dbg
119         $(call if_changed,objcopy)
120
121 $(obj)/vdsox32.so.dbg: $(src)/vdsox32.lds $(vobjx32s) FORCE
122         $(call if_changed,vdso)
123
124 #
125 # Build multiple 32-bit vDSO images to choose from at boot time.
126 #
127 vdso32.so-$(VDSO32-y)           += int80
128 vdso32.so-$(CONFIG_COMPAT)      += syscall
129 vdso32.so-$(VDSO32-y)           += sysenter
130
131 vdso32-images                   = $(vdso32.so-y:%=vdso32-%.so)
132
133 CPPFLAGS_vdso32.lds = $(CPPFLAGS_vdso.lds)
134 VDSO_LDFLAGS_vdso32.lds = -m32 -Wl,-m,elf_i386 -Wl,-soname=linux-gate.so.1
135
136 # This makes sure the $(obj) subdirectory exists even though vdso32/
137 # is not a kbuild sub-make subdirectory.
138 override obj-dirs = $(dir $(obj)) $(obj)/vdso32/
139
140 targets += vdso32/vdso32.lds
141 targets += vdso32/note.o vdso32/vclock_gettime.o $(vdso32.so-y:%=vdso32/%.o)
142 targets += vdso32/vclock_gettime.o
143
144 $(obj)/vdso32.o: $(vdso32-images:%=$(obj)/%)
145
146 KBUILD_AFLAGS_32 := $(filter-out -m64,$(KBUILD_AFLAGS))
147 $(vdso32-images:%=$(obj)/%.dbg): KBUILD_AFLAGS = $(KBUILD_AFLAGS_32)
148 $(vdso32-images:%=$(obj)/%.dbg): asflags-$(CONFIG_X86_64) += -m32
149
150 KBUILD_CFLAGS_32 := $(filter-out -m64,$(KBUILD_CFLAGS))
151 KBUILD_CFLAGS_32 := $(filter-out -mcmodel=kernel,$(KBUILD_CFLAGS_32))
152 KBUILD_CFLAGS_32 := $(filter-out -fno-pic,$(KBUILD_CFLAGS_32))
153 KBUILD_CFLAGS_32 := $(filter-out -mfentry,$(KBUILD_CFLAGS_32))
154 KBUILD_CFLAGS_32 += -m32 -msoft-float -mregparm=0 -fpic
155 KBUILD_CFLAGS_32 += $(call cc-option, -fno-stack-protector)
156 KBUILD_CFLAGS_32 += $(call cc-option, -foptimize-sibling-calls)
157 KBUILD_CFLAGS_32 += -fno-omit-frame-pointer
158 KBUILD_CFLAGS_32 += -DDISABLE_BRANCH_PROFILING
159 $(vdso32-images:%=$(obj)/%.dbg): KBUILD_CFLAGS = $(KBUILD_CFLAGS_32)
160
161 $(vdso32-images:%=$(obj)/%.dbg): $(obj)/vdso32-%.so.dbg: FORCE \
162                                  $(obj)/vdso32/vdso32.lds \
163                                  $(obj)/vdso32/vclock_gettime.o \
164                                  $(obj)/vdso32/note.o \
165                                  $(obj)/vdso32/%.o
166         $(call if_changed,vdso)
167
168 #
169 # The DSO images are built using a special linker script.
170 #
171 quiet_cmd_vdso = VDSO    $@
172       cmd_vdso = $(CC) -nostdlib -o $@ \
173                        $(VDSO_LDFLAGS) $(VDSO_LDFLAGS_$(filter %.lds,$(^F))) \
174                        -Wl,-T,$(filter %.lds,$^) $(filter %.o,$^) && \
175                  sh $(srctree)/$(src)/checkundef.sh '$(NM)' '$@'
176
177 VDSO_LDFLAGS = -fPIC -shared $(call cc-ldoption, -Wl$(comma)--hash-style=sysv) \
178         $(call cc-ldoption, -Wl$(comma)--build-id) -Wl,-Bsymbolic $(LTO_CFLAGS)
179 GCOV_PROFILE := n
180
181 #
182 # Install the unstripped copies of vdso*.so.  If our toolchain supports
183 # build-id, install .build-id links as well.
184 #
185 quiet_cmd_vdso_install = INSTALL $(@:install_%=%)
186 define cmd_vdso_install
187         cp $< "$(MODLIB)/vdso/$(@:install_%=%)"; \
188         if readelf -n $< |grep -q 'Build ID'; then \
189           buildid=`readelf -n $< |grep 'Build ID' |sed -e 's/^.*Build ID: \(.*\)$$/\1/'`; \
190           first=`echo $$buildid | cut -b-2`; \
191           last=`echo $$buildid | cut -b3-`; \
192           mkdir -p "$(MODLIB)/vdso/.build-id/$$first"; \
193           ln -sf "../../$(@:install_%=%)" "$(MODLIB)/vdso/.build-id/$$first/$$last.debug"; \
194         fi
195 endef
196
197 vdso_img_insttargets := $(vdso_img_sodbg:%.dbg=install_%)
198
199 $(MODLIB)/vdso: FORCE
200         @mkdir -p $(MODLIB)/vdso
201
202 $(vdso_img_insttargets): install_%: $(obj)/%.dbg $(MODLIB)/vdso FORCE
203         $(call cmd,vdso_install)
204
205 PHONY += vdso_install $(vdso_img_insttargets)
206 vdso_install: $(vdso_img_insttargets) FORCE
207
208 clean-files := vdso32-syscall* vdso32-sysenter* vdso32-int80* vdso64*