mirror of
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
synced 2025-09-18 22:14:16 +00:00
7424ee2b16
Directly passing the '--target' option to clang by appending to COMPATCC does not work if COMPATCC has been specified explicitly as an argument to Make unless the 'override' directive is used, which is ugly and different to what is done in the top-level Makefile. Move the '--target' option for clang out of COMPATCC and into VDSO_CAFLAGS, where it will be picked up when compiling and assembling the 32-bit vDSO under clang. Reported-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Will Deacon <will@kernel.org>
200 lines
7.3 KiB
Makefile
200 lines
7.3 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 $(srctree)/lib/vdso/Makefile
|
|
|
|
# Same as cc-*option, but using COMPATCC instead of CC
|
|
ifeq ($(CONFIG_CC_IS_CLANG), y)
|
|
COMPATCC ?= $(CC)
|
|
else
|
|
COMPATCC ?= $(CROSS_COMPILE_COMPAT)gcc
|
|
endif
|
|
|
|
cc32-option = $(call try-run,\
|
|
$(COMPATCC) $(1) -c -x c /dev/null -o "$$TMP",$(1),$(2))
|
|
cc32-disable-warning = $(call try-run,\
|
|
$(COMPATCC) -W$(strip $(1)) -c -x c /dev/null -o "$$TMP",-Wno-$(strip $(1)))
|
|
cc32-ldoption = $(call try-run,\
|
|
$(COMPATCC) $(1) -nostdlib -x c /dev/null -o "$$TMP",$(1),$(2))
|
|
cc32-as-instr = $(call try-run,\
|
|
printf "%b\n" "$(1)" | $(COMPATCC) $(VDSO_AFLAGS) -c -x assembler -o "$$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 := -D__KERNEL__ -nostdinc -isystem $(shell $(COMPATCC) -print-file-name=include)
|
|
VDSO_CPPFLAGS += $(LINUXINCLUDE)
|
|
|
|
# Common C and assembly flags
|
|
# From top-level Makefile
|
|
VDSO_CAFLAGS := $(VDSO_CPPFLAGS)
|
|
ifneq ($(shell $(COMPATCC) --version 2>&1 | head -n 1 | grep clang),)
|
|
VDSO_CAFLAGS += --target=$(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 += $(call cc32-option,-fno-strict-overflow)
|
|
VDSO_CFLAGS += $(call cc32-option,-Werror=strict-prototypes)
|
|
VDSO_CFLAGS += $(call cc32-option,-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
|
|
|
|
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)
|
|
|
|
VDSO_LDFLAGS := $(VDSO_CPPFLAGS)
|
|
# From arm vDSO Makefile
|
|
VDSO_LDFLAGS += -Wl,-Bsymbolic -Wl,--no-undefined -Wl,-soname=linux-vdso.so.1
|
|
VDSO_LDFLAGS += -Wl,-z,max-page-size=4096 -Wl,-z,common-page-size=4096
|
|
VDSO_LDFLAGS += -nostdlib -shared -mfloat-abi=soft
|
|
VDSO_LDFLAGS += -Wl,--hash-style=sysv
|
|
VDSO_LDFLAGS += -Wl,--build-id
|
|
VDSO_LDFLAGS += $(call cc32-ldoption,-fuse-ld=bfd)
|
|
|
|
|
|
# Borrow vdsomunge.c from the arm vDSO
|
|
# We have to use a relative path because scripts/Makefile.host prefixes
|
|
# $(hostprogs-y) with $(obj)
|
|
munge := ../../../arm/vdso/vdsomunge
|
|
hostprogs-y := $(munge)
|
|
|
|
c-obj-vdso := note.o
|
|
c-obj-vdso-gettimeofday := vgettimeofday.o
|
|
asm-obj-vdso := sigreturn.o
|
|
|
|
ifneq ($(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) $(asm-obj-vdso)
|
|
|
|
obj-y += vdso.o
|
|
extra-y += vdso.lds
|
|
CPPFLAGS_vdso.lds += -P -C -U$(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 = $(COMPATCC) -Wp,-MD,$(depfile) $(VDSO_LDFLAGS) \
|
|
-Wl,-T $(filter %.lds,$^) $(filter %.o,$^) -o $@
|
|
quiet_cmd_vdsocc = CC32 $@
|
|
cmd_vdsocc = $(COMPATCC) -Wp,-MD,$(depfile) $(VDSO_CFLAGS) -c -o $@ $<
|
|
quiet_cmd_vdsocc_gettimeofday = CC32 $@
|
|
cmd_vdsocc_gettimeofday = $(COMPATCC) -Wp,-MD,$(depfile) $(VDSO_CFLAGS) $(VDSO_CFLAGS_gettimeofday_o) -c -o $@ $<
|
|
quiet_cmd_vdsoas = AS32 $@
|
|
cmd_vdsoas = $(COMPATCC) -Wp,-MD,$(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 = INSTALL $@
|
|
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
|