1 # SPDX-License-Identifier: GPL-2.0-only
3 # Building vDSO images for sparc.
7 # files to link into the vdso
8 vobjs-y := vdso-note.o vclock_gettime.o
10 # files to link into kernel
13 # vDSO images to build
14 obj-$(CONFIG_SPARC64) += vdso-image-64.o
15 obj-$(CONFIG_COMPAT) += vdso-image-32.o
17 vobjs := $(addprefix $(obj)/, $(vobjs-y))
19 $(obj)/vdso.o: $(obj)/vdso.so
21 targets += vdso.lds $(vobjs-y)
22 targets += $(foreach x, 32 64, vdso-image-$(x).c vdso$(x).so vdso$(x).so.dbg)
24 CPPFLAGS_vdso.lds += -P -C
26 VDSO_LDFLAGS_vdso.lds = -m elf64_sparc -soname linux-vdso.so.1 --no-undefined \
29 $(obj)/vdso64.so.dbg: $(obj)/vdso.lds $(vobjs) FORCE
30 $(call if_changed,vdso)
32 HOST_EXTRACFLAGS += -I$(srctree)/tools/include
35 quiet_cmd_vdso2c = VDSO2C $@
36 cmd_vdso2c = $(obj)/vdso2c $< $(<:%.dbg=%) $@
38 $(obj)/vdso-image-%.c: $(obj)/vdso%.so.dbg $(obj)/vdso%.so $(obj)/vdso2c FORCE
39 $(call if_changed,vdso2c)
42 # Don't omit frame pointers for ease of userspace debugging, but do
43 # optimize sibling calls.
45 CFL := $(PROFILING) -mcmodel=medlow -fPIC -O2 -fasynchronous-unwind-tables -m64 \
46 $(filter -g%,$(KBUILD_CFLAGS)) -fno-stack-protector \
47 -fno-omit-frame-pointer -foptimize-sibling-calls \
48 -DDISABLE_BRANCH_PROFILING -DBUILD_VDSO
50 SPARC_REG_CFLAGS = -ffixed-g4 -ffixed-g5 -fcall-used-g5 -fcall-used-g7
52 $(vobjs): KBUILD_CFLAGS := $(filter-out $(RANDSTRUCT_CFLAGS) $(GCC_PLUGINS_CFLAGS) $(SPARC_REG_CFLAGS),$(KBUILD_CFLAGS)) $(CFL)
55 # vDSO code runs in userspace and -pg doesn't help with profiling anyway.
57 CFLAGS_REMOVE_vclock_gettime.o = -pg
58 CFLAGS_REMOVE_vdso32/vclock_gettime.o = -pg
60 $(obj)/%.so: OBJCOPYFLAGS := -S
61 $(obj)/%.so: $(obj)/%.so.dbg FORCE
62 $(call if_changed,objcopy)
64 CPPFLAGS_vdso32/vdso32.lds = $(CPPFLAGS_vdso.lds)
65 VDSO_LDFLAGS_vdso32.lds = -m elf32_sparc -soname linux-gate.so.1
67 #This makes sure the $(obj) subdirectory exists even though vdso32/
68 #is not a kbuild sub-make subdirectory
69 override obj-dirs = $(dir $(obj)) $(obj)/vdso32/
71 targets += vdso32/vdso32.lds
72 targets += vdso32/vdso-note.o
73 targets += vdso32/vclock_gettime.o
75 KBUILD_AFLAGS_32 := $(filter-out -m64,$(KBUILD_AFLAGS)) -DBUILD_VDSO
76 $(obj)/vdso32.so.dbg: KBUILD_AFLAGS = $(KBUILD_AFLAGS_32)
77 $(obj)/vdso32.so.dbg: asflags-$(CONFIG_SPARC64) += -m32
79 KBUILD_CFLAGS_32 := $(filter-out -m64,$(KBUILD_CFLAGS))
80 KBUILD_CFLAGS_32 := $(filter-out -mcmodel=medlow,$(KBUILD_CFLAGS_32))
81 KBUILD_CFLAGS_32 := $(filter-out -fno-pic,$(KBUILD_CFLAGS_32))
82 KBUILD_CFLAGS_32 := $(filter-out $(RANDSTRUCT_CFLAGS),$(KBUILD_CFLAGS_32))
83 KBUILD_CFLAGS_32 := $(filter-out $(GCC_PLUGINS_CFLAGS),$(KBUILD_CFLAGS_32))
84 KBUILD_CFLAGS_32 := $(filter-out $(SPARC_REG_CFLAGS),$(KBUILD_CFLAGS_32))
85 KBUILD_CFLAGS_32 += -m32 -msoft-float -fpic
86 KBUILD_CFLAGS_32 += -fno-stack-protector
87 KBUILD_CFLAGS_32 += $(call cc-option, -foptimize-sibling-calls)
88 KBUILD_CFLAGS_32 += -fno-omit-frame-pointer
89 KBUILD_CFLAGS_32 += -DDISABLE_BRANCH_PROFILING
90 KBUILD_CFLAGS_32 += -mv8plus
91 $(obj)/vdso32.so.dbg: KBUILD_CFLAGS = $(KBUILD_CFLAGS_32)
93 $(obj)/vdso32.so.dbg: FORCE \
94 $(obj)/vdso32/vdso32.lds \
95 $(obj)/vdso32/vclock_gettime.o \
96 $(obj)/vdso32/vdso-note.o
97 $(call if_changed,vdso)
100 # The DSO images are built using a special linker script.
102 quiet_cmd_vdso = VDSO $@
103 cmd_vdso = $(LD) -nostdlib -o $@ \
104 $(VDSO_LDFLAGS) $(VDSO_LDFLAGS_$(filter %.lds,$(^F))) \
105 -T $(filter %.lds,$^) $(filter %.o,$^) && \
106 sh $(srctree)/$(src)/checkundef.sh '$(OBJDUMP)' '$@'
108 VDSO_LDFLAGS = -shared --hash-style=both --build-id=sha1 -Bsymbolic