1# SPDX-License-Identifier: GPL-2.0-only
2#
3# Building vDSO images for sparc.
4#
5
6VDSO64-$(CONFIG_SPARC64)	:= y
7VDSOCOMPAT-$(CONFIG_COMPAT)	:= y
8
9# files to link into the vdso
10vobjs-y := vdso-note.o vclock_gettime.o
11
12# files to link into kernel
13obj-y				+= vma.o
14
15# vDSO images to build
16vdso_img-$(VDSO64-y)		+= 64
17vdso_img-$(VDSOCOMPAT-y)	+= 32
18
19vobjs := $(foreach F,$(vobjs-y),$(obj)/$F)
20
21$(obj)/vdso.o: $(obj)/vdso.so
22
23targets += vdso.lds $(vobjs-y)
24
25# Build the vDSO image C files and link them in.
26vdso_img_objs := $(vdso_img-y:%=vdso-image-%.o)
27vdso_img_cfiles := $(vdso_img-y:%=vdso-image-%.c)
28vdso_img_sodbg := $(vdso_img-y:%=vdso%.so.dbg)
29obj-y += $(vdso_img_objs)
30targets += $(vdso_img_cfiles)
31targets += $(vdso_img_sodbg) $(vdso_img-y:%=vdso%.so)
32
33CPPFLAGS_vdso.lds += -P -C
34
35VDSO_LDFLAGS_vdso.lds = -m elf64_sparc -soname linux-vdso.so.1 --no-undefined \
36			-z max-page-size=8192
37
38$(obj)/vdso64.so.dbg: $(obj)/vdso.lds $(vobjs) FORCE
39	$(call if_changed,vdso)
40
41HOST_EXTRACFLAGS += -I$(srctree)/tools/include
42hostprogs += vdso2c
43
44quiet_cmd_vdso2c = VDSO2C  $@
45      cmd_vdso2c = $(obj)/vdso2c $< $(<:%.dbg=%) $@
46
47$(obj)/vdso-image-%.c: $(obj)/vdso%.so.dbg $(obj)/vdso%.so $(obj)/vdso2c FORCE
48	$(call if_changed,vdso2c)
49
50#
51# Don't omit frame pointers for ease of userspace debugging, but do
52# optimize sibling calls.
53#
54CFL := $(PROFILING) -mcmodel=medlow -fPIC -O2 -fasynchronous-unwind-tables -m64 \
55       $(filter -g%,$(KBUILD_CFLAGS)) -fno-stack-protector \
56       -fno-omit-frame-pointer -foptimize-sibling-calls \
57       -DDISABLE_BRANCH_PROFILING -DBUILD_VDSO
58
59SPARC_REG_CFLAGS = -ffixed-g4 -ffixed-g5 -fcall-used-g5 -fcall-used-g7
60
61$(vobjs): KBUILD_CFLAGS := $(filter-out $(RANDSTRUCT_CFLAGS) $(GCC_PLUGINS_CFLAGS) $(SPARC_REG_CFLAGS),$(KBUILD_CFLAGS)) $(CFL)
62
63#
64# vDSO code runs in userspace and -pg doesn't help with profiling anyway.
65#
66CFLAGS_REMOVE_vclock_gettime.o = -pg
67CFLAGS_REMOVE_vdso32/vclock_gettime.o = -pg
68
69$(obj)/%.so: OBJCOPYFLAGS := -S
70$(obj)/%.so: $(obj)/%.so.dbg FORCE
71	$(call if_changed,objcopy)
72
73CPPFLAGS_vdso32/vdso32.lds = $(CPPFLAGS_vdso.lds)
74VDSO_LDFLAGS_vdso32.lds = -m elf32_sparc -soname linux-gate.so.1
75
76#This makes sure the $(obj) subdirectory exists even though vdso32/
77#is not a kbuild sub-make subdirectory
78override obj-dirs = $(dir $(obj)) $(obj)/vdso32/
79
80targets += vdso32/vdso32.lds
81targets += vdso32/vdso-note.o
82targets += vdso32/vclock_gettime.o
83
84KBUILD_AFLAGS_32 := $(filter-out -m64,$(KBUILD_AFLAGS)) -DBUILD_VDSO
85$(obj)/vdso32.so.dbg: KBUILD_AFLAGS = $(KBUILD_AFLAGS_32)
86$(obj)/vdso32.so.dbg: asflags-$(CONFIG_SPARC64) += -m32
87
88KBUILD_CFLAGS_32 := $(filter-out -m64,$(KBUILD_CFLAGS))
89KBUILD_CFLAGS_32 := $(filter-out -mcmodel=medlow,$(KBUILD_CFLAGS_32))
90KBUILD_CFLAGS_32 := $(filter-out -fno-pic,$(KBUILD_CFLAGS_32))
91KBUILD_CFLAGS_32 := $(filter-out $(RANDSTRUCT_CFLAGS),$(KBUILD_CFLAGS_32))
92KBUILD_CFLAGS_32 := $(filter-out $(GCC_PLUGINS_CFLAGS),$(KBUILD_CFLAGS_32))
93KBUILD_CFLAGS_32 := $(filter-out $(SPARC_REG_CFLAGS),$(KBUILD_CFLAGS_32))
94KBUILD_CFLAGS_32 += -m32 -msoft-float -fpic
95KBUILD_CFLAGS_32 += -fno-stack-protector
96KBUILD_CFLAGS_32 += $(call cc-option, -foptimize-sibling-calls)
97KBUILD_CFLAGS_32 += -fno-omit-frame-pointer
98KBUILD_CFLAGS_32 += -DDISABLE_BRANCH_PROFILING
99KBUILD_CFLAGS_32 += -mv8plus
100$(obj)/vdso32.so.dbg: KBUILD_CFLAGS = $(KBUILD_CFLAGS_32)
101
102$(obj)/vdso32.so.dbg: FORCE \
103			$(obj)/vdso32/vdso32.lds \
104			$(obj)/vdso32/vclock_gettime.o \
105			$(obj)/vdso32/vdso-note.o
106		$(call	if_changed,vdso)
107
108#
109# The DSO images are built using a special linker script.
110#
111quiet_cmd_vdso = VDSO    $@
112      cmd_vdso = $(LD) -nostdlib -o $@ \
113		       $(VDSO_LDFLAGS) $(VDSO_LDFLAGS_$(filter %.lds,$(^F))) \
114		       -T $(filter %.lds,$^) $(filter %.o,$^) && \
115		sh $(srctree)/$(src)/checkundef.sh '$(OBJDUMP)' '$@'
116
117VDSO_LDFLAGS = -shared --hash-style=both --build-id=sha1 -Bsymbolic
118GCOV_PROFILE := n
119
120#
121# Install the unstripped copies of vdso*.so.  If our toolchain supports
122# build-id, install .build-id links as well.
123#
124quiet_cmd_vdso_install = INSTALL $(@:install_%=%)
125define cmd_vdso_install
126	cp $< "$(MODLIB)/vdso/$(@:install_%=%)"; \
127	if readelf -n $< |grep -q 'Build ID'; then \
128	  buildid=`readelf -n $< |grep 'Build ID' |sed -e 's/^.*Build ID: \(.*\)$$/\1/'`; \
129	  first=`echo $$buildid | cut -b-2`; \
130	  last=`echo $$buildid | cut -b3-`; \
131	  mkdir -p "$(MODLIB)/vdso/.build-id/$$first"; \
132	  ln -sf "../../$(@:install_%=%)" "$(MODLIB)/vdso/.build-id/$$first/$$last.debug"; \
133	fi
134endef
135
136vdso_img_insttargets := $(vdso_img_sodbg:%.dbg=install_%)
137
138$(MODLIB)/vdso: FORCE
139	@mkdir -p $(MODLIB)/vdso
140
141$(vdso_img_insttargets): install_%: $(obj)/%.dbg $(MODLIB)/vdso FORCE
142	$(call cmd,vdso_install)
143
144PHONY += vdso_install $(vdso_img_insttargets)
145vdso_install: $(vdso_img_insttargets) FORCE
146