1 # SPDX-License-Identifier: GPL-2.0 !! 1 # SPDX-License-Identifier: GPL-2.0-only
2 # Objects to go into the VDSO. !! 2 #
>> 3 # Building vDSO images for sparc.
>> 4 #
3 5
4 # Include the generic Makefile to check the bu !! 6 # files to link into the vdso
5 include $(srctree)/lib/vdso/Makefile !! 7 vobjs-y := vdso-note.o vclock_gettime.o
6 8
7 obj-vdso-y := elf.o vgetcpu.o vgettimeofday.o !! 9 # files to link into kernel
8 vgetrandom-chacha.o sigreturn.o !! 10 obj-y += vma.o
9 11
10 # Common compiler flags between ABIs. !! 12 # vDSO images to build
11 ccflags-vdso := \ !! 13 obj-$(CONFIG_SPARC64) += vdso-image-64.o
12 $(filter -I%,$(KBUILD_CFLAGS)) \ !! 14 obj-$(CONFIG_COMPAT) += vdso-image-32.o
13 $(filter -E%,$(KBUILD_CFLAGS)) \ <<
14 $(filter -march=%,$(KBUILD_CFLAGS)) \ <<
15 $(filter -m%-float,$(KBUILD_CFLAGS)) \ <<
16 $(CLANG_FLAGS) \ <<
17 -D__VDSO__ <<
18 15
19 cflags-vdso := $(ccflags-vdso) \ !! 16 vobjs := $(addprefix $(obj)/, $(vobjs-y))
20 -isystem $(shell $(CC) -print-file-nam <<
21 $(filter -W%,$(filter-out -Wa$(comma)% <<
22 -O2 -g -fno-strict-aliasing -fno-commo <<
23 -fno-stack-protector -fno-jump-tables <<
24 $(call cc-option, -fno-asynchronous-un <<
25 $(call cc-option, -fno-stack-protector <<
26 aflags-vdso := $(ccflags-vdso) \ <<
27 -D__ASSEMBLY__ -Wa,-gdwarf-2 <<
28 17
29 ifneq ($(c-gettimeofday-y),) !! 18 $(obj)/vdso.o: $(obj)/vdso.so
30 CFLAGS_vgettimeofday.o += -include $(c-getti <<
31 endif <<
32 19
33 ifneq ($(c-getrandom-y),) !! 20 targets += vdso.lds $(vobjs-y)
34 CFLAGS_vgetrandom.o += -include $(c-getrando !! 21 targets += $(foreach x, 32 64, vdso-image-$(x).c vdso$(x).so vdso$(x).so.dbg)
35 endif <<
36 22
37 # VDSO linker flags. !! 23 CPPFLAGS_vdso.lds += -P -C
38 ldflags-y := -Bsymbolic --no-undefined -soname <<
39 $(filter -E%,$(KBUILD_CFLAGS)) -nostdl <<
40 --hash-style=sysv --build-id -T <<
41 24
42 # !! 25 VDSO_LDFLAGS_vdso.lds = -m elf64_sparc -soname linux-vdso.so.1 --no-undefined \
43 # Shared build commands. !! 26 -z max-page-size=8192
44 # <<
45 27
46 quiet_cmd_vdsold_and_vdso_check = LD $@ !! 28 $(obj)/vdso64.so.dbg: $(obj)/vdso.lds $(vobjs) FORCE
47 cmd_vdsold_and_vdso_check = $(cmd_ld); $ !! 29 $(call if_changed,vdso)
48 30
49 quiet_cmd_vdsoas_o_S = AS $@ !! 31 HOST_EXTRACFLAGS += -I$(srctree)/tools/include
50 cmd_vdsoas_o_S = $(CC) $(a_flags) -c -o !! 32 hostprogs += vdso2c
51 33
52 # Generate VDSO offsets using helper script !! 34 quiet_cmd_vdso2c = VDSO2C $@
53 gen-vdsosym := $(src)/gen_vdso_offsets.sh !! 35 cmd_vdso2c = $(obj)/vdso2c $< $(<:%.dbg=%) $@
54 quiet_cmd_vdsosym = VDSOSYM $@ <<
55 cmd_vdsosym = $(NM) $< | $(gen-vdsosym) <<
56 36
57 include/generated/vdso-offsets.h: $(obj)/vdso. !! 37 $(obj)/vdso-image-%.c: $(obj)/vdso%.so.dbg $(obj)/vdso%.so $(obj)/vdso2c FORCE
58 $(call if_changed,vdsosym) !! 38 $(call if_changed,vdso2c)
59 39
60 # 40 #
61 # Build native VDSO. !! 41 # Don't omit frame pointers for ease of userspace debugging, but do
>> 42 # optimize sibling calls.
62 # 43 #
>> 44 CFL := $(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
63 48
64 native-abi := $(filter -mabi=%,$(KBUILD_CFLAGS !! 49 SPARC_REG_CFLAGS = -ffixed-g4 -ffixed-g5 -fcall-used-g5 -fcall-used-g7
65 <<
66 targets += $(obj-vdso-y) <<
67 targets += vdso.lds vdso.so.dbg vdso.so <<
68 50
69 obj-vdso := $(obj-vdso-y:%.o=$(obj)/%.o) !! 51 $(vobjs): KBUILD_CFLAGS := $(filter-out $(RANDSTRUCT_CFLAGS) $(GCC_PLUGINS_CFLAGS) $(SPARC_REG_CFLAGS),$(KBUILD_CFLAGS)) $(CFL)
70 52
71 $(obj-vdso): KBUILD_CFLAGS := $(cflags-vdso) $ !! 53 #
72 $(obj-vdso): KBUILD_AFLAGS := $(aflags-vdso) $ !! 54 # vDSO code runs in userspace and -pg doesn't help with profiling anyway.
>> 55 #
>> 56 CFLAGS_REMOVE_vclock_gettime.o = -pg
>> 57 CFLAGS_REMOVE_vdso32/vclock_gettime.o = -pg
73 58
74 $(obj)/vdso.lds: KBUILD_CPPFLAGS := $(ccflags- !! 59 $(obj)/%.so: OBJCOPYFLAGS := -S
>> 60 $(obj)/%.so: $(obj)/%.so.dbg FORCE
>> 61 $(call if_changed,objcopy)
75 62
76 $(obj)/vdso.so.dbg: $(obj)/vdso.lds $(obj-vdso !! 63 CPPFLAGS_vdso32/vdso32.lds = $(CPPFLAGS_vdso.lds)
77 $(call if_changed,vdsold_and_vdso_chec !! 64 VDSO_LDFLAGS_vdso32.lds = -m elf32_sparc -soname linux-gate.so.1
78 65
79 $(obj)/vdso.so: OBJCOPYFLAGS := -S !! 66 #This makes sure the $(obj) subdirectory exists even though vdso32/
80 $(obj)/vdso.so: $(obj)/vdso.so.dbg FORCE !! 67 #is not a kbuild sub-make subdirectory
81 $(call if_changed,objcopy) !! 68 override obj-dirs = $(dir $(obj)) $(obj)/vdso32/
>> 69
>> 70 targets += vdso32/vdso32.lds
>> 71 targets += vdso32/vdso-note.o
>> 72 targets += vdso32/vclock_gettime.o
>> 73
>> 74 KBUILD_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
>> 78 KBUILD_CFLAGS_32 := $(filter-out -m64,$(KBUILD_CFLAGS))
>> 79 KBUILD_CFLAGS_32 := $(filter-out -mcmodel=medlow,$(KBUILD_CFLAGS_32))
>> 80 KBUILD_CFLAGS_32 := $(filter-out -fno-pic,$(KBUILD_CFLAGS_32))
>> 81 KBUILD_CFLAGS_32 := $(filter-out $(RANDSTRUCT_CFLAGS),$(KBUILD_CFLAGS_32))
>> 82 KBUILD_CFLAGS_32 := $(filter-out $(GCC_PLUGINS_CFLAGS),$(KBUILD_CFLAGS_32))
>> 83 KBUILD_CFLAGS_32 := $(filter-out $(SPARC_REG_CFLAGS),$(KBUILD_CFLAGS_32))
>> 84 KBUILD_CFLAGS_32 += -m32 -msoft-float -fpic
>> 85 KBUILD_CFLAGS_32 += -fno-stack-protector
>> 86 KBUILD_CFLAGS_32 += $(call cc-option, -foptimize-sibling-calls)
>> 87 KBUILD_CFLAGS_32 += -fno-omit-frame-pointer
>> 88 KBUILD_CFLAGS_32 += -DDISABLE_BRANCH_PROFILING
>> 89 KBUILD_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)
82 97
83 obj-y += vdso.o !! 98 #
>> 99 # The DSO images are built using a special linker script.
>> 100 #
>> 101 quiet_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)' '$@'
84 106
85 $(obj)/vdso.o : $(obj)/vdso.so !! 107 VDSO_LDFLAGS = -shared --hash-style=both --build-id=sha1 -Bsymbolic
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