Loading...
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
34export CPPFLAGS_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: $(src)/vdso.lds $(vobjs) FORCE
42 $(call if_changed,vdso)
43
44HOST_EXTRACFLAGS += -I$(srctree)/tools/include
45hostprogs-y += vdso2c
46
47quiet_cmd_vdso2c = VDSO2C $@
48define cmd_vdso2c
49 $(obj)/vdso2c $< $(<:%.dbg=%) $@
50endef
51
52$(obj)/vdso-image-%.c: $(obj)/vdso%.so.dbg $(obj)/vdso%.so $(obj)/vdso2c FORCE
53 $(call if_changed,vdso2c)
54
55#
56# Don't omit frame pointers for ease of userspace debugging, but do
57# optimize sibling calls.
58#
59CFL := $(PROFILING) -mcmodel=medlow -fPIC -O2 -fasynchronous-unwind-tables \
60 -m64 -ffixed-g2 -ffixed-g3 -fcall-used-g4 -fcall-used-g5 -ffixed-g6 \
61 -ffixed-g7 $(filter -g%,$(KBUILD_CFLAGS)) \
62 $(call cc-option, -fno-stack-protector) -fno-omit-frame-pointer \
63 -foptimize-sibling-calls -DBUILD_VDSO
64
65$(vobjs): KBUILD_CFLAGS += $(CFL)
66
67#
68# vDSO code runs in userspace and -pg doesn't help with profiling anyway.
69#
70CFLAGS_REMOVE_vdso-note.o = -pg
71CFLAGS_REMOVE_vclock_gettime.o = -pg
72
73$(obj)/%.so: OBJCOPYFLAGS := -S
74$(obj)/%.so: $(obj)/%.so.dbg
75 $(call if_changed,objcopy)
76
77CPPFLAGS_vdso32.lds = $(CPPFLAGS_vdso.lds)
78VDSO_LDFLAGS_vdso32.lds = -m32 -Wl,-m,elf32_sparc,-soname=linux-gate.so.1
79
80#This makes sure the $(obj) subdirectory exists even though vdso32
81#is not a kbuild sub-make subdirectory
82override obj-dirs = $(dir $(obj)) $(obj)/vdso32/
83
84targets += vdso32/vdso32.lds
85targets += vdso32/vdso-note.o
86targets += vdso32/vclock_gettime.o
87
88KBUILD_AFLAGS_32 := $(filter-out -m64,$(KBUILD_AFLAGS)) -DBUILD_VDSO
89$(obj)/vdso32.so.dbg: KBUILD_AFLAGS = $(KBUILD_AFLAGS_32)
90$(obj)/vdso32.so.dbg: asflags-$(CONFIG_SPARC64) += -m32
91
92KBUILD_CFLAGS_32 := $(filter-out -m64,$(KBUILD_CFLAGS))
93KBUILD_CFLAGS_32 := $(filter-out -mcmodel=medlow,$(KBUILD_CFLAGS_32))
94KBUILD_CFLAGS_32 := $(filter-out -fno-pic,$(KBUILD_CFLAGS_32))
95KBUILD_CFLAGS_32 := $(filter-out $(GCC_PLUGINS_CFLAGS),$(KBUILD_CFLAGS_32))
96KBUILD_CFLAGS_32 += -m32 -msoft-float -fpic -mno-app-regs -ffixed-g7
97KBUILD_CFLAGS_32 += $(call cc-option, -fno-stack-protector)
98KBUILD_CFLAGS_32 += $(call cc-option, -foptimize-sibling-calls)
99KBUILD_CFLAGS_32 += -fno-omit-frame-pointer
100KBUILD_CFLAGS_32 += -DDISABLE_BRANCH_PROFILING
101KBUILD_CFLAGS_32 += -mv8plus
102$(obj)/vdso32.so.dbg: KBUILD_CFLAGS = $(KBUILD_CFLAGS_32)
103
104$(obj)/vdso32.so.dbg: FORCE \
105 $(obj)/vdso32/vdso32.lds \
106 $(obj)/vdso32/vclock_gettime.o \
107 $(obj)/vdso32/vdso-note.o
108 $(call if_changed,vdso)
109
110#
111# The DSO images are built using a special linker script.
112#
113quiet_cmd_vdso = VDSO $@
114 cmd_vdso = $(CC) -nostdlib -o $@ \
115 $(VDSO_LDFLAGS) $(VDSO_LDFLAGS_$(filter %.lds,$(^F))) \
116 -Wl,-T,$(filter %.lds,$^) $(filter %.o,$^)
117
118VDSO_LDFLAGS = -fPIC -shared $(call cc-ldoption, -Wl$(comma)--hash-style=sysv) \
119 $(call cc-ldoption, -Wl$(comma)--build-id) -Wl,-Bsymbolic
120GCOV_PROFILE := n
121
122#
123# Install the unstripped copies of vdso*.so. If our toolchain supports
124# build-id, install .build-id links as well.
125#
126quiet_cmd_vdso_install = INSTALL $(@:install_%=%)
127define cmd_vdso_install
128 cp $< "$(MODLIB)/vdso/$(@:install_%=%)"; \
129 if readelf -n $< |grep -q 'Build ID'; then \
130 buildid=`readelf -n $< |grep 'Build ID' |sed -e 's/^.*Build ID: \(.*\)$$/\1/'`; \
131 first=`echo $$buildid | cut -b-2`; \
132 last=`echo $$buildid | cut -b3-`; \
133 mkdir -p "$(MODLIB)/vdso/.build-id/$$first"; \
134 ln -sf "../../$(@:install_%=%)" "$(MODLIB)/vdso/.build-id/$$first/$$last.debug"; \
135 fi
136endef
137
138vdso_img_insttargets := $(vdso_img_sodbg:%.dbg=install_%)
139
140$(MODLIB)/vdso: FORCE
141 @mkdir -p $(MODLIB)/vdso
142
143$(vdso_img_insttargets): install_%: $(obj)/%.dbg $(MODLIB)/vdso FORCE
144 $(call cmd,vdso_install)
145
146PHONY += vdso_install $(vdso_img_insttargets)
147vdso_install: $(vdso_img_insttargets) FORCE
1# SPDX-License-Identifier: GPL-2.0-only
2#
3# Building vDSO images for sparc.
4#
5
6# files to link into the vdso
7vobjs-y := vdso-note.o vclock_gettime.o
8
9# files to link into kernel
10obj-y += vma.o
11
12# vDSO images to build
13obj-$(CONFIG_SPARC64) += vdso-image-64.o
14obj-$(CONFIG_COMPAT) += vdso-image-32.o
15
16vobjs := $(addprefix $(obj)/, $(vobjs-y))
17
18$(obj)/vdso.o: $(obj)/vdso.so
19
20targets += vdso.lds $(vobjs-y)
21targets += $(foreach x, 32 64, vdso-image-$(x).c vdso$(x).so vdso$(x).so.dbg)
22
23CPPFLAGS_vdso.lds += -P -C
24
25VDSO_LDFLAGS_vdso.lds = -m elf64_sparc -soname linux-vdso.so.1 --no-undefined \
26 -z max-page-size=8192
27
28$(obj)/vdso64.so.dbg: $(obj)/vdso.lds $(vobjs) FORCE
29 $(call if_changed,vdso)
30
31HOST_EXTRACFLAGS += -I$(srctree)/tools/include
32hostprogs += vdso2c
33
34quiet_cmd_vdso2c = VDSO2C $@
35 cmd_vdso2c = $(obj)/vdso2c $< $(<:%.dbg=%) $@
36
37$(obj)/vdso-image-%.c: $(obj)/vdso%.so.dbg $(obj)/vdso%.so $(obj)/vdso2c FORCE
38 $(call if_changed,vdso2c)
39
40#
41# Don't omit frame pointers for ease of userspace debugging, but do
42# optimize sibling calls.
43#
44CFL := $(PROFILING) -mcmodel=medlow -fPIC -O2 -fasynchronous-unwind-tables -m64 \
45 $(filter -g%,$(KBUILD_CFLAGS)) -fno-stack-protector \
46 -fno-omit-frame-pointer -foptimize-sibling-calls \
47 -DDISABLE_BRANCH_PROFILING -DBUILD_VDSO
48
49SPARC_REG_CFLAGS = -ffixed-g4 -ffixed-g5 $(call cc-option,-fcall-used-g5) $(call cc-option,-fcall-used-g7)
50
51$(vobjs): KBUILD_CFLAGS := $(filter-out $(RANDSTRUCT_CFLAGS) $(GCC_PLUGINS_CFLAGS) $(SPARC_REG_CFLAGS),$(KBUILD_CFLAGS)) $(CFL)
52
53#
54# vDSO code runs in userspace and -pg doesn't help with profiling anyway.
55#
56CFLAGS_REMOVE_vclock_gettime.o = -pg
57CFLAGS_REMOVE_vdso32/vclock_gettime.o = -pg
58
59$(obj)/%.so: OBJCOPYFLAGS := -S
60$(obj)/%.so: $(obj)/%.so.dbg FORCE
61 $(call if_changed,objcopy)
62
63CPPFLAGS_vdso32/vdso32.lds = $(CPPFLAGS_vdso.lds)
64VDSO_LDFLAGS_vdso32.lds = -m elf32_sparc -soname linux-gate.so.1
65
66#This makes sure the $(obj) subdirectory exists even though vdso32
67#is not a kbuild sub-make subdirectory
68override obj-dirs = $(dir $(obj)) $(obj)/vdso32/
69
70targets += vdso32/vdso32.lds
71targets += vdso32/vdso-note.o
72targets += vdso32/vclock_gettime.o
73
74KBUILD_AFLAGS_32 := $(filter-out -m64,$(KBUILD_AFLAGS)) -DBUILD_VDSO
75$(obj)/vdso32.so.dbg: KBUILD_AFLAGS = $(KBUILD_AFLAGS_32)
76$(obj)/vdso32.so.dbg: asflags-$(CONFIG_SPARC64) += -m32
77
78KBUILD_CFLAGS_32 := $(filter-out -m64,$(KBUILD_CFLAGS))
79KBUILD_CFLAGS_32 := $(filter-out -mcmodel=medlow,$(KBUILD_CFLAGS_32))
80KBUILD_CFLAGS_32 := $(filter-out -fno-pic,$(KBUILD_CFLAGS_32))
81KBUILD_CFLAGS_32 := $(filter-out $(RANDSTRUCT_CFLAGS),$(KBUILD_CFLAGS_32))
82KBUILD_CFLAGS_32 := $(filter-out $(GCC_PLUGINS_CFLAGS),$(KBUILD_CFLAGS_32))
83KBUILD_CFLAGS_32 := $(filter-out $(SPARC_REG_CFLAGS),$(KBUILD_CFLAGS_32))
84KBUILD_CFLAGS_32 += -m32 -msoft-float -fpic
85KBUILD_CFLAGS_32 += -fno-stack-protector
86KBUILD_CFLAGS_32 += $(call cc-option, -foptimize-sibling-calls)
87KBUILD_CFLAGS_32 += -fno-omit-frame-pointer
88KBUILD_CFLAGS_32 += -DDISABLE_BRANCH_PROFILING
89KBUILD_CFLAGS_32 += -mv8plus
90$(obj)/vdso32.so.dbg: KBUILD_CFLAGS = $(KBUILD_CFLAGS_32)
91
92$(obj)/vdso32.so.dbg: FORCE \
93 $(obj)/vdso32/vdso32.lds \
94 $(obj)/vdso32/vclock_gettime.o \
95 $(obj)/vdso32/vdso-note.o
96 $(call if_changed,vdso)
97
98#
99# The DSO images are built using a special linker script.
100#
101quiet_cmd_vdso = VDSO $@
102 cmd_vdso = $(LD) -nostdlib -o $@ \
103 $(VDSO_LDFLAGS) $(VDSO_LDFLAGS_$(filter %.lds,$(^F))) \
104 -T $(filter %.lds,$^) $(filter %.o,$^) && \
105 sh $(src)/checkundef.sh '$(OBJDUMP)' '$@'
106
107VDSO_LDFLAGS = -shared --hash-style=both --build-id=sha1 -Bsymbolic