1 # SPDX-License-Identifier: GPL-2.0 !! 1 #
>> 2 # Building vDSO images for sparc.
>> 3 #
2 4
3 # Include the generic Makefile to check the bu !! 5 KBUILD_CFLAGS += $(DISABLE_LTO)
4 include $(srctree)/lib/vdso/Makefile <<
5 6
6 hostprogs := vdsomunge !! 7 VDSO64-$(CONFIG_SPARC64) := y
>> 8 VDSOCOMPAT-$(CONFIG_COMPAT) := y
7 9
8 obj-vdso := vgettimeofday.o datapage.o note.o !! 10 # files to link into the vdso
>> 11 vobjs-y := vdso-note.o vclock_gettime.o
9 12
10 # Build rules !! 13 # files to link into kernel
11 targets := $(obj-vdso) vdso.so vdso.so.dbg vds !! 14 obj-y += vma.o
12 obj-vdso := $(addprefix $(obj)/, $(obj-vdso)) <<
13 15
14 ccflags-y := -fPIC -fno-common -fno-builtin -f !! 16 # vDSO images to build
15 ccflags-y += -DDISABLE_BRANCH_PROFILING -DBUIL !! 17 vdso_img-$(VDSO64-y) += 64
>> 18 vdso_img-$(VDSOCOMPAT-y) += 32
16 19
17 ldflags-$(CONFIG_CPU_ENDIAN_BE8) := --be8 !! 20 vobjs := $(foreach F,$(vobjs-y),$(obj)/$F)
18 ldflags-y := -Bsymbolic --no-undefined -soname <<
19 -z max-page-size=4096 -shared $(ld <<
20 --hash-style=sysv --build-id=sha1 <<
21 -T <<
22 21
23 obj-$(CONFIG_VDSO) += vdso.o !! 22 $(obj)/vdso.o: $(obj)/vdso.so
24 CPPFLAGS_vdso.lds += -P -C -U$(ARCH) <<
25 23
26 CFLAGS_REMOVE_vdso.o = -pg !! 24 targets += vdso.lds $(vobjs-y)
27 25
28 # Force -O2 to avoid libgcc dependencies !! 26 # Build the vDSO image C files and link them in.
29 CFLAGS_REMOVE_vgettimeofday.o = -pg -Os $(RAND !! 27 vdso_img_objs := $(vdso_img-y:%=vdso-image-%.o)
30 ifeq ($(c-gettimeofday-y),) !! 28 vdso_img_cfiles := $(vdso_img-y:%=vdso-image-%.c)
31 CFLAGS_vgettimeofday.o = -O2 !! 29 vdso_img_sodbg := $(vdso_img-y:%=vdso%.so.dbg)
32 else !! 30 obj-y += $(vdso_img_objs)
33 CFLAGS_vgettimeofday.o = -O2 -include $(c-gett !! 31 targets += $(vdso_img_cfiles)
34 endif !! 32 targets += $(vdso_img_sodbg) $(vdso_img-y:%=vdso%.so)
35 33
36 # Force dependency !! 34 export CPPFLAGS_vdso.lds += -P -C
37 $(obj)/vdso.o : $(obj)/vdso.so <<
38 35
39 # Link rule for the .so file !! 36 VDSO_LDFLAGS_vdso.lds = -m64 -Wl,-soname=linux-vdso.so.1 \
40 $(obj)/vdso.so.raw: $(obj)/vdso.lds $(obj-vdso !! 37 -Wl,--no-undefined \
41 $(call if_changed,vdsold_and_vdso_chec !! 38 -Wl,-z,max-page-size=8192 -Wl,-z,common-page-size=8192 \
>> 39 $(DISABLE_LTO)
42 40
43 $(obj)/vdso.so.dbg: $(obj)/vdso.so.raw $(obj)/ !! 41 $(obj)/vdso64.so.dbg: $(src)/vdso.lds $(vobjs) FORCE
44 $(call if_changed,vdsomunge) !! 42 $(call if_changed,vdso)
>> 43
>> 44 HOST_EXTRACFLAGS += -I$(srctree)/tools/include
>> 45 hostprogs-y += vdso2c
>> 46
>> 47 quiet_cmd_vdso2c = VDSO2C $@
>> 48 define cmd_vdso2c
>> 49 $(obj)/vdso2c $< $(<:%.dbg=%) $@
>> 50 endef
>> 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 #
>> 59 CFL := $(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 #
>> 70 CFLAGS_REMOVE_vdso-note.o = -pg
>> 71 CFLAGS_REMOVE_vclock_gettime.o = -pg
45 72
46 # Strip rule for the .so file <<
47 $(obj)/%.so: OBJCOPYFLAGS := -S 73 $(obj)/%.so: OBJCOPYFLAGS := -S
48 $(obj)/%.so: $(obj)/%.so.dbg FORCE !! 74 $(obj)/%.so: $(obj)/%.so.dbg
49 $(call if_changed,objcopy) 75 $(call if_changed,objcopy)
50 76
51 # Actual build commands !! 77 CPPFLAGS_vdso32.lds = $(CPPFLAGS_vdso.lds)
52 quiet_cmd_vdsold_and_vdso_check = LD $@ !! 78 VDSO_LDFLAGS_vdso32.lds = -m32 -Wl,-m,elf32_sparc,-soname=linux-gate.so.1
53 cmd_vdsold_and_vdso_check = $(cmd_ld); $ !! 79
>> 80 #This makes sure the $(obj) subdirectory exists even though vdso32/
>> 81 #is not a kbuild sub-make subdirectory
>> 82 override obj-dirs = $(dir $(obj)) $(obj)/vdso32/
>> 83
>> 84 targets += vdso32/vdso32.lds
>> 85 targets += vdso32/vdso-note.o
>> 86 targets += vdso32/vclock_gettime.o
>> 87
>> 88 KBUILD_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
>> 92 KBUILD_CFLAGS_32 := $(filter-out -m64,$(KBUILD_CFLAGS))
>> 93 KBUILD_CFLAGS_32 := $(filter-out -mcmodel=medlow,$(KBUILD_CFLAGS_32))
>> 94 KBUILD_CFLAGS_32 := $(filter-out -fno-pic,$(KBUILD_CFLAGS_32))
>> 95 KBUILD_CFLAGS_32 := $(filter-out $(GCC_PLUGINS_CFLAGS),$(KBUILD_CFLAGS_32))
>> 96 KBUILD_CFLAGS_32 += -m32 -msoft-float -fpic -mno-app-regs -ffixed-g7
>> 97 KBUILD_CFLAGS_32 += $(call cc-option, -fno-stack-protector)
>> 98 KBUILD_CFLAGS_32 += $(call cc-option, -foptimize-sibling-calls)
>> 99 KBUILD_CFLAGS_32 += -fno-omit-frame-pointer
>> 100 KBUILD_CFLAGS_32 += -DDISABLE_BRANCH_PROFILING
>> 101 KBUILD_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 #
>> 113 quiet_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
>> 118 VDSO_LDFLAGS = -fPIC -shared $(call cc-ldoption, -Wl$(comma)--hash-style=sysv) \
>> 119 $(call cc-ldoption, -Wl$(comma)--build-id) -Wl,-Bsymbolic
>> 120 GCOV_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 #
>> 126 quiet_cmd_vdso_install = INSTALL $(@:install_%=%)
>> 127 define 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
>> 136 endef
>> 137
>> 138 vdso_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)
54 145
55 quiet_cmd_vdsomunge = MUNGE $@ !! 146 PHONY += vdso_install $(vdso_img_insttargets)
56 cmd_vdsomunge = $(objtree)/$(obj)/vdsomu !! 147 vdso_install: $(vdso_img_insttargets) FORCE
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