1 # SPDX-License-Identifier: GPL-2.0 !! 1 # SPDX-License-Identifier: GPL-2.0-only
>> 2 #
>> 3 # Building vDSO images for sparc.
>> 4 #
2 5
3 # Include the generic Makefile to check the bu !! 6 KBUILD_CFLAGS += $(DISABLE_LTO)
4 include $(srctree)/lib/vdso/Makefile <<
5 7
6 hostprogs := vdsomunge !! 8 VDSO64-$(CONFIG_SPARC64) := y
>> 9 VDSOCOMPAT-$(CONFIG_COMPAT) := y
7 10
8 obj-vdso := vgettimeofday.o datapage.o note.o !! 11 # files to link into the vdso
>> 12 vobjs-y := vdso-note.o vclock_gettime.o
9 13
10 # Build rules !! 14 # files to link into kernel
11 targets := $(obj-vdso) vdso.so vdso.so.dbg vds !! 15 obj-y += vma.o
12 obj-vdso := $(addprefix $(obj)/, $(obj-vdso)) <<
13 16
14 ccflags-y := -fPIC -fno-common -fno-builtin -f !! 17 # vDSO images to build
15 ccflags-y += -DDISABLE_BRANCH_PROFILING -DBUIL !! 18 vdso_img-$(VDSO64-y) += 64
>> 19 vdso_img-$(VDSOCOMPAT-y) += 32
16 20
17 ldflags-$(CONFIG_CPU_ENDIAN_BE8) := --be8 !! 21 vobjs := $(foreach F,$(vobjs-y),$(obj)/$F)
18 ldflags-y := -Bsymbolic --no-undefined -soname <<
19 -z max-page-size=4096 -shared $(ld <<
20 --hash-style=sysv --build-id=sha1 <<
21 -T <<
22 22
23 obj-$(CONFIG_VDSO) += vdso.o !! 23 $(obj)/vdso.o: $(obj)/vdso.so
24 CPPFLAGS_vdso.lds += -P -C -U$(ARCH) <<
25 24
26 CFLAGS_REMOVE_vdso.o = -pg !! 25 targets += vdso.lds $(vobjs-y)
27 26
28 # Force -O2 to avoid libgcc dependencies !! 27 # Build the vDSO image C files and link them in.
29 CFLAGS_REMOVE_vgettimeofday.o = -pg -Os $(RAND !! 28 vdso_img_objs := $(vdso_img-y:%=vdso-image-%.o)
30 ifeq ($(c-gettimeofday-y),) !! 29 vdso_img_cfiles := $(vdso_img-y:%=vdso-image-%.c)
31 CFLAGS_vgettimeofday.o = -O2 !! 30 vdso_img_sodbg := $(vdso_img-y:%=vdso%.so.dbg)
32 else !! 31 obj-y += $(vdso_img_objs)
33 CFLAGS_vgettimeofday.o = -O2 -include $(c-gett !! 32 targets += $(vdso_img_cfiles)
34 endif !! 33 targets += $(vdso_img_sodbg) $(vdso_img-y:%=vdso%.so)
35 34
36 # Force dependency !! 35 CPPFLAGS_vdso.lds += -P -C
37 $(obj)/vdso.o : $(obj)/vdso.so <<
38 36
39 # Link rule for the .so file !! 37 VDSO_LDFLAGS_vdso.lds = -m elf64_sparc -soname linux-vdso.so.1 --no-undefined \
40 $(obj)/vdso.so.raw: $(obj)/vdso.lds $(obj-vdso !! 38 -z max-page-size=8192
41 $(call if_changed,vdsold_and_vdso_chec <<
42 39
43 $(obj)/vdso.so.dbg: $(obj)/vdso.so.raw $(obj)/ !! 40 $(obj)/vdso64.so.dbg: $(obj)/vdso.lds $(vobjs) FORCE
44 $(call if_changed,vdsomunge) !! 41 $(call if_changed,vdso)
>> 42
>> 43 HOST_EXTRACFLAGS += -I$(srctree)/tools/include
>> 44 hostprogs-y += vdso2c
>> 45
>> 46 quiet_cmd_vdso2c = VDSO2C $@
>> 47 cmd_vdso2c = $(obj)/vdso2c $< $(<:%.dbg=%) $@
>> 48
>> 49 $(obj)/vdso-image-%.c: $(obj)/vdso%.so.dbg $(obj)/vdso%.so $(obj)/vdso2c FORCE
>> 50 $(call if_changed,vdso2c)
>> 51
>> 52 #
>> 53 # Don't omit frame pointers for ease of userspace debugging, but do
>> 54 # optimize sibling calls.
>> 55 #
>> 56 CFL := $(PROFILING) -mcmodel=medlow -fPIC -O2 -fasynchronous-unwind-tables -m64 \
>> 57 $(filter -g%,$(KBUILD_CFLAGS)) $(call cc-option, -fno-stack-protector) \
>> 58 -fno-omit-frame-pointer -foptimize-sibling-calls \
>> 59 -DDISABLE_BRANCH_PROFILING -DBUILD_VDSO
>> 60
>> 61 SPARC_REG_CFLAGS = -ffixed-g4 -ffixed-g5 -fcall-used-g5 -fcall-used-g7
>> 62
>> 63 $(vobjs): KBUILD_CFLAGS := $(filter-out $(GCC_PLUGINS_CFLAGS) $(SPARC_REG_CFLAGS),$(KBUILD_CFLAGS)) $(CFL)
>> 64
>> 65 #
>> 66 # vDSO code runs in userspace and -pg doesn't help with profiling anyway.
>> 67 #
>> 68 CFLAGS_REMOVE_vclock_gettime.o = -pg
>> 69 CFLAGS_REMOVE_vdso32/vclock_gettime.o = -pg
45 70
46 # Strip rule for the .so file <<
47 $(obj)/%.so: OBJCOPYFLAGS := -S 71 $(obj)/%.so: OBJCOPYFLAGS := -S
48 $(obj)/%.so: $(obj)/%.so.dbg FORCE 72 $(obj)/%.so: $(obj)/%.so.dbg FORCE
49 $(call if_changed,objcopy) 73 $(call if_changed,objcopy)
50 74
51 # Actual build commands !! 75 CPPFLAGS_vdso32/vdso32.lds = $(CPPFLAGS_vdso.lds)
52 quiet_cmd_vdsold_and_vdso_check = LD $@ !! 76 VDSO_LDFLAGS_vdso32.lds = -m elf32_sparc -soname linux-gate.so.1
53 cmd_vdsold_and_vdso_check = $(cmd_ld); $ !! 77
>> 78 #This makes sure the $(obj) subdirectory exists even though vdso32/
>> 79 #is not a kbuild sub-make subdirectory
>> 80 override obj-dirs = $(dir $(obj)) $(obj)/vdso32/
>> 81
>> 82 targets += vdso32/vdso32.lds
>> 83 targets += vdso32/vdso-note.o
>> 84 targets += vdso32/vclock_gettime.o
>> 85
>> 86 KBUILD_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
>> 90 KBUILD_CFLAGS_32 := $(filter-out -m64,$(KBUILD_CFLAGS))
>> 91 KBUILD_CFLAGS_32 := $(filter-out -mcmodel=medlow,$(KBUILD_CFLAGS_32))
>> 92 KBUILD_CFLAGS_32 := $(filter-out -fno-pic,$(KBUILD_CFLAGS_32))
>> 93 KBUILD_CFLAGS_32 := $(filter-out $(GCC_PLUGINS_CFLAGS),$(KBUILD_CFLAGS_32))
>> 94 KBUILD_CFLAGS_32 := $(filter-out $(SPARC_REG_CFLAGS),$(KBUILD_CFLAGS_32))
>> 95 KBUILD_CFLAGS_32 += -m32 -msoft-float -fpic
>> 96 KBUILD_CFLAGS_32 += $(call cc-option, -fno-stack-protector)
>> 97 KBUILD_CFLAGS_32 += $(call cc-option, -foptimize-sibling-calls)
>> 98 KBUILD_CFLAGS_32 += -fno-omit-frame-pointer
>> 99 KBUILD_CFLAGS_32 += -DDISABLE_BRANCH_PROFILING
>> 100 KBUILD_CFLAGS_32 += -mv8plus
>> 101 $(obj)/vdso32.so.dbg: KBUILD_CFLAGS = $(KBUILD_CFLAGS_32)
>> 102
>> 103 $(obj)/vdso32.so.dbg: FORCE \
>> 104 $(obj)/vdso32/vdso32.lds \
>> 105 $(obj)/vdso32/vclock_gettime.o \
>> 106 $(obj)/vdso32/vdso-note.o
>> 107 $(call if_changed,vdso)
>> 108
>> 109 #
>> 110 # The DSO images are built using a special linker script.
>> 111 #
>> 112 quiet_cmd_vdso = VDSO $@
>> 113 cmd_vdso = $(LD) -nostdlib -o $@ \
>> 114 $(VDSO_LDFLAGS) $(VDSO_LDFLAGS_$(filter %.lds,$(^F))) \
>> 115 -T $(filter %.lds,$^) $(filter %.o,$^) && \
>> 116 sh $(srctree)/$(src)/checkundef.sh '$(OBJDUMP)' '$@'
>> 117
>> 118 VDSO_LDFLAGS = -shared --hash-style=both --build-id -Bsymbolic
>> 119 GCOV_PROFILE := n
>> 120
>> 121 #
>> 122 # Install the unstripped copies of vdso*.so. If our toolchain supports
>> 123 # build-id, install .build-id links as well.
>> 124 #
>> 125 quiet_cmd_vdso_install = INSTALL $(@:install_%=%)
>> 126 define cmd_vdso_install
>> 127 cp $< "$(MODLIB)/vdso/$(@:install_%=%)"; \
>> 128 if readelf -n $< |grep -q 'Build ID'; then \
>> 129 buildid=`readelf -n $< |grep 'Build ID' |sed -e 's/^.*Build ID: \(.*\)$$/\1/'`; \
>> 130 first=`echo $$buildid | cut -b-2`; \
>> 131 last=`echo $$buildid | cut -b3-`; \
>> 132 mkdir -p "$(MODLIB)/vdso/.build-id/$$first"; \
>> 133 ln -sf "../../$(@:install_%=%)" "$(MODLIB)/vdso/.build-id/$$first/$$last.debug"; \
>> 134 fi
>> 135 endef
>> 136
>> 137 vdso_img_insttargets := $(vdso_img_sodbg:%.dbg=install_%)
>> 138
>> 139 $(MODLIB)/vdso: FORCE
>> 140 @mkdir -p $(MODLIB)/vdso
>> 141
>> 142 $(vdso_img_insttargets): install_%: $(obj)/%.dbg $(MODLIB)/vdso FORCE
>> 143 $(call cmd,vdso_install)
54 144
55 quiet_cmd_vdsomunge = MUNGE $@ !! 145 PHONY += vdso_install $(vdso_img_insttargets)
56 cmd_vdsomunge = $(objtree)/$(obj)/vdsomu !! 146 vdso_install: $(vdso_img_insttargets) FORCE
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