mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-20 02:34:23 +08:00
f24f910884
For the vDSO, user code wants runtime unwind info. Make sure that, if we use .cfi directives, we generate it. Signed-off-by: Andy Lutomirski <luto@kernel.org> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-kernel@vger.kernel.org Link: http://lkml.kernel.org/r/16e29ad8855e6508197000d8c41f56adb00d7580.1444091584.git.luto@kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
197 lines
6.0 KiB
Makefile
197 lines
6.0 KiB
Makefile
#
|
|
# Building vDSO images for x86.
|
|
#
|
|
|
|
KBUILD_CFLAGS += $(DISABLE_LTO)
|
|
KASAN_SANITIZE := n
|
|
|
|
VDSO64-$(CONFIG_X86_64) := y
|
|
VDSOX32-$(CONFIG_X86_X32_ABI) := y
|
|
VDSO32-$(CONFIG_X86_32) := y
|
|
VDSO32-$(CONFIG_IA32_EMULATION) := y
|
|
|
|
# files to link into the vdso
|
|
vobjs-y := vdso-note.o vclock_gettime.o vgetcpu.o
|
|
|
|
# files to link into kernel
|
|
obj-y += vma.o
|
|
|
|
# vDSO images to build
|
|
vdso_img-$(VDSO64-y) += 64
|
|
vdso_img-$(VDSOX32-y) += x32
|
|
vdso_img-$(VDSO32-y) += 32
|
|
|
|
obj-$(VDSO32-y) += vdso32-setup.o
|
|
|
|
vobjs := $(foreach F,$(vobjs-y),$(obj)/$F)
|
|
|
|
$(obj)/vdso.o: $(obj)/vdso.so
|
|
|
|
targets += vdso.lds $(vobjs-y)
|
|
|
|
# Build the vDSO image C files and link them in.
|
|
vdso_img_objs := $(vdso_img-y:%=vdso-image-%.o)
|
|
vdso_img_cfiles := $(vdso_img-y:%=vdso-image-%.c)
|
|
vdso_img_sodbg := $(vdso_img-y:%=vdso%.so.dbg)
|
|
obj-y += $(vdso_img_objs)
|
|
targets += $(vdso_img_cfiles)
|
|
targets += $(vdso_img_sodbg)
|
|
.SECONDARY: $(vdso_img-y:%=$(obj)/vdso-image-%.c) \
|
|
$(vdso_img-y:%=$(obj)/vdso%.so)
|
|
|
|
export CPPFLAGS_vdso.lds += -P -C
|
|
|
|
VDSO_LDFLAGS_vdso.lds = -m64 -Wl,-soname=linux-vdso.so.1 \
|
|
-Wl,--no-undefined \
|
|
-Wl,-z,max-page-size=4096 -Wl,-z,common-page-size=4096 \
|
|
$(DISABLE_LTO)
|
|
|
|
$(obj)/vdso64.so.dbg: $(src)/vdso.lds $(vobjs) FORCE
|
|
$(call if_changed,vdso)
|
|
|
|
HOST_EXTRACFLAGS += -I$(srctree)/tools/include -I$(srctree)/include/uapi -I$(srctree)/arch/x86/include/uapi
|
|
hostprogs-y += vdso2c
|
|
|
|
quiet_cmd_vdso2c = VDSO2C $@
|
|
define cmd_vdso2c
|
|
$(obj)/vdso2c $< $(<:%.dbg=%) $@
|
|
endef
|
|
|
|
$(obj)/vdso-image-%.c: $(obj)/vdso%.so.dbg $(obj)/vdso%.so $(obj)/vdso2c FORCE
|
|
$(call if_changed,vdso2c)
|
|
|
|
#
|
|
# Don't omit frame pointers for ease of userspace debugging, but do
|
|
# optimize sibling calls.
|
|
#
|
|
CFL := $(PROFILING) -mcmodel=small -fPIC -O2 -fasynchronous-unwind-tables -m64 \
|
|
$(filter -g%,$(KBUILD_CFLAGS)) $(call cc-option, -fno-stack-protector) \
|
|
-fno-omit-frame-pointer -foptimize-sibling-calls \
|
|
-DDISABLE_BRANCH_PROFILING -DBUILD_VDSO
|
|
|
|
$(vobjs): KBUILD_CFLAGS += $(CFL)
|
|
|
|
#
|
|
# vDSO code runs in userspace and -pg doesn't help with profiling anyway.
|
|
#
|
|
CFLAGS_REMOVE_vdso-note.o = -pg
|
|
CFLAGS_REMOVE_vclock_gettime.o = -pg
|
|
CFLAGS_REMOVE_vgetcpu.o = -pg
|
|
CFLAGS_REMOVE_vvar.o = -pg
|
|
|
|
#
|
|
# X32 processes use x32 vDSO to access 64bit kernel data.
|
|
#
|
|
# Build x32 vDSO image:
|
|
# 1. Compile x32 vDSO as 64bit.
|
|
# 2. Convert object files to x32.
|
|
# 3. Build x32 VDSO image with x32 objects, which contains 64bit codes
|
|
# so that it can reach 64bit address space with 64bit pointers.
|
|
#
|
|
|
|
CPPFLAGS_vdsox32.lds = $(CPPFLAGS_vdso.lds)
|
|
VDSO_LDFLAGS_vdsox32.lds = -Wl,-m,elf32_x86_64 \
|
|
-Wl,-soname=linux-vdso.so.1 \
|
|
-Wl,-z,max-page-size=4096 \
|
|
-Wl,-z,common-page-size=4096
|
|
|
|
# 64-bit objects to re-brand as x32
|
|
vobjs64-for-x32 := $(filter-out $(vobjs-nox32),$(vobjs-y))
|
|
|
|
# x32-rebranded versions
|
|
vobjx32s-y := $(vobjs64-for-x32:.o=-x32.o)
|
|
|
|
# same thing, but in the output directory
|
|
vobjx32s := $(foreach F,$(vobjx32s-y),$(obj)/$F)
|
|
|
|
# Convert 64bit object file to x32 for x32 vDSO.
|
|
quiet_cmd_x32 = X32 $@
|
|
cmd_x32 = $(OBJCOPY) -O elf32-x86-64 $< $@
|
|
|
|
$(obj)/%-x32.o: $(obj)/%.o FORCE
|
|
$(call if_changed,x32)
|
|
|
|
targets += vdsox32.lds $(vobjx32s-y)
|
|
|
|
$(obj)/%.so: OBJCOPYFLAGS := -S
|
|
$(obj)/%.so: $(obj)/%.so.dbg
|
|
$(call if_changed,objcopy)
|
|
|
|
$(obj)/vdsox32.so.dbg: $(src)/vdsox32.lds $(vobjx32s) FORCE
|
|
$(call if_changed,vdso)
|
|
|
|
CPPFLAGS_vdso32.lds = $(CPPFLAGS_vdso.lds)
|
|
VDSO_LDFLAGS_vdso32.lds = -m32 -Wl,-m,elf_i386 -Wl,-soname=linux-gate.so.1
|
|
|
|
# This makes sure the $(obj) subdirectory exists even though vdso32/
|
|
# is not a kbuild sub-make subdirectory.
|
|
override obj-dirs = $(dir $(obj)) $(obj)/vdso32/
|
|
|
|
targets += vdso32/vdso32.lds
|
|
targets += vdso32/note.o vdso32/vclock_gettime.o vdso32/system_call.o
|
|
targets += vdso32/vclock_gettime.o
|
|
|
|
KBUILD_AFLAGS_32 := $(filter-out -m64,$(KBUILD_AFLAGS)) -DBUILD_VDSO
|
|
$(obj)/vdso32.so.dbg: KBUILD_AFLAGS = $(KBUILD_AFLAGS_32)
|
|
$(obj)/vdso32.so.dbg: asflags-$(CONFIG_X86_64) += -m32
|
|
|
|
KBUILD_CFLAGS_32 := $(filter-out -m64,$(KBUILD_CFLAGS))
|
|
KBUILD_CFLAGS_32 := $(filter-out -mcmodel=kernel,$(KBUILD_CFLAGS_32))
|
|
KBUILD_CFLAGS_32 := $(filter-out -fno-pic,$(KBUILD_CFLAGS_32))
|
|
KBUILD_CFLAGS_32 := $(filter-out -mfentry,$(KBUILD_CFLAGS_32))
|
|
KBUILD_CFLAGS_32 += -m32 -msoft-float -mregparm=0 -fpic
|
|
KBUILD_CFLAGS_32 += $(call cc-option, -fno-stack-protector)
|
|
KBUILD_CFLAGS_32 += $(call cc-option, -foptimize-sibling-calls)
|
|
KBUILD_CFLAGS_32 += -fno-omit-frame-pointer
|
|
KBUILD_CFLAGS_32 += -DDISABLE_BRANCH_PROFILING
|
|
$(obj)/vdso32.so.dbg: KBUILD_CFLAGS = $(KBUILD_CFLAGS_32)
|
|
|
|
$(obj)/vdso32.so.dbg: FORCE \
|
|
$(obj)/vdso32/vdso32.lds \
|
|
$(obj)/vdso32/vclock_gettime.o \
|
|
$(obj)/vdso32/note.o \
|
|
$(obj)/vdso32/system_call.o
|
|
$(call if_changed,vdso)
|
|
|
|
#
|
|
# The DSO images are built using a special linker script.
|
|
#
|
|
quiet_cmd_vdso = VDSO $@
|
|
cmd_vdso = $(CC) -nostdlib -o $@ \
|
|
$(VDSO_LDFLAGS) $(VDSO_LDFLAGS_$(filter %.lds,$(^F))) \
|
|
-Wl,-T,$(filter %.lds,$^) $(filter %.o,$^) && \
|
|
sh $(srctree)/$(src)/checkundef.sh '$(NM)' '$@'
|
|
|
|
VDSO_LDFLAGS = -fPIC -shared $(call cc-ldoption, -Wl$(comma)--hash-style=both) \
|
|
$(call cc-ldoption, -Wl$(comma)--build-id) -Wl,-Bsymbolic $(LTO_CFLAGS)
|
|
GCOV_PROFILE := n
|
|
|
|
#
|
|
# Install the unstripped copies of vdso*.so. If our toolchain supports
|
|
# build-id, install .build-id links as well.
|
|
#
|
|
quiet_cmd_vdso_install = INSTALL $(@:install_%=%)
|
|
define cmd_vdso_install
|
|
cp $< "$(MODLIB)/vdso/$(@:install_%=%)"; \
|
|
if readelf -n $< |grep -q 'Build ID'; then \
|
|
buildid=`readelf -n $< |grep 'Build ID' |sed -e 's/^.*Build ID: \(.*\)$$/\1/'`; \
|
|
first=`echo $$buildid | cut -b-2`; \
|
|
last=`echo $$buildid | cut -b3-`; \
|
|
mkdir -p "$(MODLIB)/vdso/.build-id/$$first"; \
|
|
ln -sf "../../$(@:install_%=%)" "$(MODLIB)/vdso/.build-id/$$first/$$last.debug"; \
|
|
fi
|
|
endef
|
|
|
|
vdso_img_insttargets := $(vdso_img_sodbg:%.dbg=install_%)
|
|
|
|
$(MODLIB)/vdso: FORCE
|
|
@mkdir -p $(MODLIB)/vdso
|
|
|
|
$(vdso_img_insttargets): install_%: $(obj)/%.dbg $(MODLIB)/vdso FORCE
|
|
$(call cmd,vdso_install)
|
|
|
|
PHONY += vdso_install $(vdso_img_insttargets)
|
|
vdso_install: $(vdso_img_insttargets) FORCE
|
|
|
|
clean-files := vdso32.so vdso32.so.dbg vdso64* vdso-image-*.c vdsox32.so*
|