mirror of https://gitee.com/openkylin/linux.git
211 lines
7.4 KiB
Makefile
211 lines
7.4 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0
|
|
#
|
|
# Makefile for vdso32
|
|
#
|
|
|
|
# Absolute relocation type $(ARCH_REL_TYPE_ABS) needs to be defined before
|
|
# the inclusion of generic Makefile.
|
|
ARCH_REL_TYPE_ABS := R_ARM_JUMP_SLOT|R_ARM_GLOB_DAT|R_ARM_ABS32
|
|
include $(srctree)/lib/vdso/Makefile
|
|
|
|
# Same as cc-*option, but using CC_COMPAT instead of CC
|
|
ifeq ($(CONFIG_CC_IS_CLANG), y)
|
|
CC_COMPAT_CLANG_FLAGS := --target=$(notdir $(CROSS_COMPILE_COMPAT:%-=%))
|
|
|
|
CC_COMPAT ?= $(CC)
|
|
CC_COMPAT += $(CC_COMPAT_CLANG_FLAGS)
|
|
|
|
ifneq ($(LLVM),)
|
|
LD_COMPAT ?= $(LD)
|
|
else
|
|
LD_COMPAT ?= $(CROSS_COMPILE_COMPAT)ld
|
|
endif
|
|
else
|
|
CC_COMPAT ?= $(CROSS_COMPILE_COMPAT)gcc
|
|
LD_COMPAT ?= $(CROSS_COMPILE_COMPAT)ld
|
|
endif
|
|
|
|
cc32-option = $(call try-run,\
|
|
$(CC_COMPAT) $(1) -c -x c /dev/null -o "$$TMP",$(1),$(2))
|
|
cc32-disable-warning = $(call try-run,\
|
|
$(CC_COMPAT) -W$(strip $(1)) -c -x c /dev/null -o "$$TMP",-Wno-$(strip $(1)))
|
|
cc32-as-instr = $(call try-run,\
|
|
printf "%b\n" "$(1)" | $(CC_COMPAT) $(VDSO_AFLAGS) -c -x assembler -o "$$TMP" -,$(2),$(3))
|
|
|
|
# We cannot use the global flags to compile the vDSO files, the main reason
|
|
# being that the 32-bit compiler may be older than the main (64-bit) compiler
|
|
# and therefore may not understand flags set using $(cc-option ...). Besides,
|
|
# arch-specific options should be taken from the arm Makefile instead of the
|
|
# arm64 one.
|
|
# As a result we set our own flags here.
|
|
|
|
# KBUILD_CPPFLAGS and NOSTDINC_FLAGS from top-level Makefile
|
|
VDSO_CPPFLAGS := -DBUILD_VDSO -D__KERNEL__ -nostdinc -isystem $(shell $(CC_COMPAT) -print-file-name=include)
|
|
VDSO_CPPFLAGS += $(LINUXINCLUDE)
|
|
|
|
# Common C and assembly flags
|
|
# From top-level Makefile
|
|
VDSO_CAFLAGS := $(VDSO_CPPFLAGS)
|
|
ifneq ($(shell $(CC_COMPAT) --version 2>&1 | head -n 1 | grep clang),)
|
|
VDSO_CAFLAGS += --target=$(notdir $(CROSS_COMPILE_COMPAT:%-=%))
|
|
endif
|
|
|
|
VDSO_CAFLAGS += $(call cc32-option,-fno-PIE)
|
|
ifdef CONFIG_DEBUG_INFO
|
|
VDSO_CAFLAGS += -g
|
|
endif
|
|
|
|
# From arm Makefile
|
|
VDSO_CAFLAGS += $(call cc32-option,-fno-dwarf2-cfi-asm)
|
|
VDSO_CAFLAGS += -mabi=aapcs-linux -mfloat-abi=soft
|
|
ifeq ($(CONFIG_CPU_BIG_ENDIAN), y)
|
|
VDSO_CAFLAGS += -mbig-endian
|
|
else
|
|
VDSO_CAFLAGS += -mlittle-endian
|
|
endif
|
|
|
|
# From arm vDSO Makefile
|
|
VDSO_CAFLAGS += -fPIC -fno-builtin -fno-stack-protector
|
|
VDSO_CAFLAGS += -DDISABLE_BRANCH_PROFILING
|
|
|
|
|
|
# Try to compile for ARMv8. If the compiler is too old and doesn't support it,
|
|
# fall back to v7. There is no easy way to check for what architecture the code
|
|
# is being compiled, so define a macro specifying that (see arch/arm/Makefile).
|
|
VDSO_CAFLAGS += $(call cc32-option,-march=armv8-a -D__LINUX_ARM_ARCH__=8,\
|
|
-march=armv7-a -D__LINUX_ARM_ARCH__=7)
|
|
|
|
VDSO_CFLAGS := $(VDSO_CAFLAGS)
|
|
VDSO_CFLAGS += -DENABLE_COMPAT_VDSO=1
|
|
# KBUILD_CFLAGS from top-level Makefile
|
|
VDSO_CFLAGS += -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
|
|
-fno-strict-aliasing -fno-common \
|
|
-Werror-implicit-function-declaration \
|
|
-Wno-format-security \
|
|
-std=gnu89
|
|
VDSO_CFLAGS += -O2
|
|
# Some useful compiler-dependent flags from top-level Makefile
|
|
VDSO_CFLAGS += $(call cc32-option,-Wdeclaration-after-statement,)
|
|
VDSO_CFLAGS += $(call cc32-option,-Wno-pointer-sign)
|
|
VDSO_CFLAGS += -fno-strict-overflow
|
|
VDSO_CFLAGS += $(call cc32-option,-Werror=strict-prototypes)
|
|
VDSO_CFLAGS += -Werror=date-time
|
|
VDSO_CFLAGS += $(call cc32-option,-Werror=incompatible-pointer-types)
|
|
|
|
# The 32-bit compiler does not provide 128-bit integers, which are used in
|
|
# some headers that are indirectly included from the vDSO code.
|
|
# This hack makes the compiler happy and should trigger a warning/error if
|
|
# variables of such type are referenced.
|
|
VDSO_CFLAGS += -D__uint128_t='void*'
|
|
# Silence some warnings coming from headers that operate on long's
|
|
# (on GCC 4.8 or older, there is unfortunately no way to silence this warning)
|
|
VDSO_CFLAGS += $(call cc32-disable-warning,shift-count-overflow)
|
|
VDSO_CFLAGS += -Wno-int-to-pointer-cast
|
|
|
|
# Compile as THUMB2 or ARM. Unwinding via frame-pointers in THUMB2 is
|
|
# unreliable.
|
|
ifeq ($(CONFIG_THUMB2_COMPAT_VDSO), y)
|
|
VDSO_CFLAGS += -mthumb -fomit-frame-pointer
|
|
else
|
|
VDSO_CFLAGS += -marm
|
|
endif
|
|
|
|
VDSO_AFLAGS := $(VDSO_CAFLAGS)
|
|
VDSO_AFLAGS += -D__ASSEMBLY__
|
|
|
|
# Check for binutils support for dmb ishld
|
|
dmbinstr := $(call cc32-as-instr,dmb ishld,-DCONFIG_AS_DMB_ISHLD=1)
|
|
|
|
VDSO_CFLAGS += $(dmbinstr)
|
|
VDSO_AFLAGS += $(dmbinstr)
|
|
|
|
# From arm vDSO Makefile
|
|
VDSO_LDFLAGS += -Bsymbolic --no-undefined -soname=linux-vdso.so.1
|
|
VDSO_LDFLAGS += -z max-page-size=4096 -z common-page-size=4096
|
|
VDSO_LDFLAGS += -nostdlib -shared --hash-style=sysv --build-id=sha1
|
|
|
|
|
|
# Borrow vdsomunge.c from the arm vDSO
|
|
# We have to use a relative path because scripts/Makefile.host prefixes
|
|
# $(hostprogs) with $(obj)
|
|
munge := ../../../arm/vdso/vdsomunge
|
|
hostprogs := $(munge)
|
|
|
|
c-obj-vdso := note.o
|
|
c-obj-vdso-gettimeofday := vgettimeofday.o
|
|
|
|
ifneq ($(c-gettimeofday-y),)
|
|
VDSO_CFLAGS_gettimeofday_o += -include $(c-gettimeofday-y)
|
|
endif
|
|
|
|
VDSO_CFLAGS_REMOVE_vgettimeofday.o = $(CC_FLAGS_FTRACE) -Os
|
|
|
|
# Build rules
|
|
targets := $(c-obj-vdso) $(c-obj-vdso-gettimeofday) $(asm-obj-vdso) vdso.so vdso.so.dbg vdso.so.raw
|
|
c-obj-vdso := $(addprefix $(obj)/, $(c-obj-vdso))
|
|
c-obj-vdso-gettimeofday := $(addprefix $(obj)/, $(c-obj-vdso-gettimeofday))
|
|
asm-obj-vdso := $(addprefix $(obj)/, $(asm-obj-vdso))
|
|
obj-vdso := $(c-obj-vdso) $(c-obj-vdso-gettimeofday) $(asm-obj-vdso)
|
|
|
|
targets += vdso.lds
|
|
CPPFLAGS_vdso.lds += -P -C -U$(ARCH)
|
|
|
|
# Force dependency (vdso.s includes vdso.so through incbin)
|
|
$(obj)/vdso.o: $(obj)/vdso.so
|
|
|
|
include/generated/vdso32-offsets.h: $(obj)/vdso.so.dbg FORCE
|
|
$(call if_changed,vdsosym)
|
|
|
|
# Strip rule for vdso.so
|
|
$(obj)/vdso.so: OBJCOPYFLAGS := -S
|
|
$(obj)/vdso.so: $(obj)/vdso.so.dbg FORCE
|
|
$(call if_changed,objcopy)
|
|
|
|
$(obj)/vdso.so.dbg: $(obj)/vdso.so.raw $(obj)/$(munge) FORCE
|
|
$(call if_changed,vdsomunge)
|
|
|
|
# Link rule for the .so file, .lds has to be first
|
|
$(obj)/vdso.so.raw: $(src)/vdso.lds $(obj-vdso) FORCE
|
|
$(call if_changed,vdsold_and_vdso_check)
|
|
|
|
# Compilation rules for the vDSO sources
|
|
$(c-obj-vdso): %.o: %.c FORCE
|
|
$(call if_changed_dep,vdsocc)
|
|
$(c-obj-vdso-gettimeofday): %.o: %.c FORCE
|
|
$(call if_changed_dep,vdsocc_gettimeofday)
|
|
$(asm-obj-vdso): %.o: %.S FORCE
|
|
$(call if_changed_dep,vdsoas)
|
|
|
|
# Actual build commands
|
|
quiet_cmd_vdsold_and_vdso_check = LD32 $@
|
|
cmd_vdsold_and_vdso_check = $(cmd_vdsold); $(cmd_vdso_check)
|
|
|
|
quiet_cmd_vdsold = LD32 $@
|
|
cmd_vdsold = $(LD_COMPAT) $(VDSO_LDFLAGS) \
|
|
-T $(filter %.lds,$^) $(filter %.o,$^) -o $@
|
|
quiet_cmd_vdsocc = CC32 $@
|
|
cmd_vdsocc = $(CC_COMPAT) -Wp,-MD,$(depfile) $(VDSO_CFLAGS) -c -o $@ $<
|
|
quiet_cmd_vdsocc_gettimeofday = CC32 $@
|
|
cmd_vdsocc_gettimeofday = $(CC_COMPAT) -Wp,-MD,$(depfile) $(VDSO_CFLAGS) $(VDSO_CFLAGS_gettimeofday_o) -c -o $@ $<
|
|
quiet_cmd_vdsoas = AS32 $@
|
|
cmd_vdsoas = $(CC_COMPAT) -Wp,-MD,$(depfile) $(VDSO_AFLAGS) -c -o $@ $<
|
|
|
|
quiet_cmd_vdsomunge = MUNGE $@
|
|
cmd_vdsomunge = $(obj)/$(munge) $< $@
|
|
|
|
# Generate vDSO offsets using helper script (borrowed from the 64-bit vDSO)
|
|
gen-vdsosym := $(srctree)/$(src)/../vdso/gen_vdso_offsets.sh
|
|
quiet_cmd_vdsosym = VDSOSYM $@
|
|
# The AArch64 nm should be able to read an AArch32 binary
|
|
cmd_vdsosym = $(NM) $< | $(gen-vdsosym) | LC_ALL=C sort > $@
|
|
|
|
# Install commands for the unstripped file
|
|
quiet_cmd_vdso_install = INSTALL32 $@
|
|
cmd_vdso_install = cp $(obj)/$@.dbg $(MODLIB)/vdso/vdso32.so
|
|
|
|
vdso.so: $(obj)/vdso.so.dbg
|
|
@mkdir -p $(MODLIB)/vdso
|
|
$(call cmd,vdso_install)
|
|
|
|
vdso_install: vdso.so
|