[thirdparty/linux.git] / arch / arm64 / kernel / vdso32 / 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 ?= $(CC)
else
CC_COMPAT ?= $(CROSS_COMPILE_COMPAT)gcc
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-ldoption = $(call try-run,\
        $(CC_COMPAT) $(1) -nostdlib -x c /dev/null -o "$$TMP",$(1),$(2))
cc32-as-instr = $(call try-run,\
	printf "%b\n" "$(1)" | $(CC_COMPAT) $(VDSO_AFLAGS) -c -x assembler -o "$$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 := -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 += $(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) with $(obj)
munge := ../../../arm/vdso/vdsomunge
hostprogs := $(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 = $(CC_COMPAT) -Wp,-MD,$(depfile) $(VDSO_LDFLAGS) \
                   -Wl,-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 = 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
Commit	Line	Data
a7f71a2c VF	1	# SPDX-License-Identifier: GPL-2.0
	2	#
	3	# Makefile for vdso32
	4	#
	5
	6	# Absolute relocation type $(ARCH_REL_TYPE_ABS) needs to be defined before
	7	# the inclusion of generic Makefile.
	8	ARCH_REL_TYPE_ABS := R_ARM_JUMP_SLOT\|R_ARM_GLOB_DAT\|R_ARM_ABS32
	9	include $(srctree)/lib/vdso/Makefile
	10
eff9cb67	11	# Same as cc-*option, but using CC_COMPAT instead of CC
bcaf9b57	12	ifeq ($(CONFIG_CC_IS_CLANG), y)
eff9cb67	13	CC_COMPAT ?= $(CC)
bcaf9b57	14	else
eff9cb67	15	CC_COMPAT ?= $(CROSS_COMPILE_COMPAT)gcc
bcaf9b57 WD	16	endif
bcaf9b57 WD	17
a7f71a2c	18	cc32-option = $(call try-run,\
eff9cb67	19	$(CC_COMPAT) $(1) -c -x c /dev/null -o "$$TMP",$(1),$(2))
a7f71a2c	20	cc32-disable-warning = $(call try-run,\
eff9cb67	21	$(CC_COMPAT) -W$(strip $(1)) -c -x c /dev/null -o "$$TMP",-Wno-$(strip $(1)))
a7f71a2c	22	cc32-ldoption = $(call try-run,\
eff9cb67	23	$(CC_COMPAT) $(1) -nostdlib -x c /dev/null -o "$$TMP",$(1),$(2))
0df2c90e	24	cc32-as-instr = $(call try-run,\
eff9cb67	25	printf "%b\n" "$(1)" \| $(CC_COMPAT) $(VDSO_AFLAGS) -c -x assembler -o "$$TMP" -,$(2),$(3))
a7f71a2c VF	26
	27	# We cannot use the global flags to compile the vDSO files, the main reason
	28	# being that the 32-bit compiler may be older than the main (64-bit) compiler
	29	# and therefore may not understand flags set using $(cc-option ...). Besides,
	30	# arch-specific options should be taken from the arm Makefile instead of the
	31	# arm64 one.
	32	# As a result we set our own flags here.
	33
c71e88c4	34	# KBUILD_CPPFLAGS and NOSTDINC_FLAGS from top-level Makefile
eff9cb67	35	VDSO_CPPFLAGS := -D__KERNEL__ -nostdinc -isystem $(shell $(CC_COMPAT) -print-file-name=include)
a7f71a2c	36	VDSO_CPPFLAGS += $(LINUXINCLUDE)
a7f71a2c VF	37
	38	# Common C and assembly flags
	39	# From top-level Makefile
	40	VDSO_CAFLAGS := $(VDSO_CPPFLAGS)
eff9cb67	41	ifneq ($(shell $(CC_COMPAT) --version 2>&1 \| head -n 1 \| grep clang),)
7424ee2b WD	42	VDSO_CAFLAGS += --target=$(notdir $(CROSS_COMPILE_COMPAT:%-=%))
	43	endif
	44
a7f71a2c VF	45	VDSO_CAFLAGS += $(call cc32-option,-fno-PIE)
	46	ifdef CONFIG_DEBUG_INFO
	47	VDSO_CAFLAGS += -g
	48	endif
a7f71a2c VF	49
	50	# From arm Makefile
	51	VDSO_CAFLAGS += $(call cc32-option,-fno-dwarf2-cfi-asm)
	52	VDSO_CAFLAGS += -mabi=aapcs-linux -mfloat-abi=soft
	53	ifeq ($(CONFIG_CPU_BIG_ENDIAN), y)
	54	VDSO_CAFLAGS += -mbig-endian
	55	else
	56	VDSO_CAFLAGS += -mlittle-endian
	57	endif
	58
	59	# From arm vDSO Makefile
	60	VDSO_CAFLAGS += -fPIC -fno-builtin -fno-stack-protector
	61	VDSO_CAFLAGS += -DDISABLE_BRANCH_PROFILING
	62
0df2c90e	63
a7f71a2c VF	64	# Try to compile for ARMv8. If the compiler is too old and doesn't support it,
	65	# fall back to v7. There is no easy way to check for what architecture the code
	66	# is being compiled, so define a macro specifying that (see arch/arm/Makefile).
	67	VDSO_CAFLAGS += $(call cc32-option,-march=armv8-a -D__LINUX_ARM_ARCH__=8,\
	68	-march=armv7-a -D__LINUX_ARM_ARCH__=7)
	69
	70	VDSO_CFLAGS := $(VDSO_CAFLAGS)
	71	VDSO_CFLAGS += -DENABLE_COMPAT_VDSO=1
	72	# KBUILD_CFLAGS from top-level Makefile
	73	VDSO_CFLAGS += -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
	74	-fno-strict-aliasing -fno-common \
	75	-Werror-implicit-function-declaration \
	76	-Wno-format-security \
	77	-std=gnu89
	78	VDSO_CFLAGS += -O2
	79	# Some useful compiler-dependent flags from top-level Makefile
	80	VDSO_CFLAGS += $(call cc32-option,-Wdeclaration-after-statement,)
	81	VDSO_CFLAGS += $(call cc32-option,-Wno-pointer-sign)
	82	VDSO_CFLAGS += $(call cc32-option,-fno-strict-overflow)
	83	VDSO_CFLAGS += $(call cc32-option,-Werror=strict-prototypes)
	84	VDSO_CFLAGS += $(call cc32-option,-Werror=date-time)
	85	VDSO_CFLAGS += $(call cc32-option,-Werror=incompatible-pointer-types)
	86
	87	# The 32-bit compiler does not provide 128-bit integers, which are used in
	88	# some headers that are indirectly included from the vDSO code.
	89	# This hack makes the compiler happy and should trigger a warning/error if
	90	# variables of such type are referenced.
	91	VDSO_CFLAGS += -D__uint128_t='void*'
	92	# Silence some warnings coming from headers that operate on long's
	93	# (on GCC 4.8 or older, there is unfortunately no way to silence this warning)
	94	VDSO_CFLAGS += $(call cc32-disable-warning,shift-count-overflow)
	95	VDSO_CFLAGS += -Wno-int-to-pointer-cast
	96
	97	VDSO_AFLAGS := $(VDSO_CAFLAGS)
	98	VDSO_AFLAGS += -D__ASSEMBLY__
	99
0df2c90e VF	100	# Check for binutils support for dmb ishld
	101	dmbinstr := $(call cc32-as-instr,dmb ishld,-DCONFIG_AS_DMB_ISHLD=1)
	102
	103	VDSO_CFLAGS += $(dmbinstr)
	104	VDSO_AFLAGS += $(dmbinstr)
	105
a7f71a2c VF	106	VDSO_LDFLAGS := $(VDSO_CPPFLAGS)
	107	# From arm vDSO Makefile
	108	VDSO_LDFLAGS += -Wl,-Bsymbolic -Wl,--no-undefined -Wl,-soname=linux-vdso.so.1
	109	VDSO_LDFLAGS += -Wl,-z,max-page-size=4096 -Wl,-z,common-page-size=4096
	110	VDSO_LDFLAGS += -nostdlib -shared -mfloat-abi=soft
89ff7131 MY	111	VDSO_LDFLAGS += -Wl,--hash-style=sysv
89ff7131 MY	112	VDSO_LDFLAGS += -Wl,--build-id
a7f71a2c VF	113	VDSO_LDFLAGS += $(call cc32-ldoption,-fuse-ld=bfd)
	114
	115
	116	# Borrow vdsomunge.c from the arm vDSO
	117	# We have to use a relative path because scripts/Makefile.host prefixes
5f2fb52f	118	# $(hostprogs) with $(obj)
a7f71a2c	119	munge := ../../../arm/vdso/vdsomunge
5f2fb52f	120	hostprogs := $(munge)
a7f71a2c VF	121
	122	c-obj-vdso := note.o
	123	c-obj-vdso-gettimeofday := vgettimeofday.o
	124	asm-obj-vdso := sigreturn.o
	125
	126	ifneq ($(c-gettimeofday-y),)
	127	VDSO_CFLAGS_gettimeofday_o += -include $(c-gettimeofday-y)
	128	endif
	129
	130	VDSO_CFLAGS_REMOVE_vgettimeofday.o = $(CC_FLAGS_FTRACE) -Os
	131
	132	# Build rules
	133	targets := $(c-obj-vdso) $(c-obj-vdso-gettimeofday) $(asm-obj-vdso) vdso.so vdso.so.dbg vdso.so.raw
	134	c-obj-vdso := $(addprefix $(obj)/, $(c-obj-vdso))
	135	c-obj-vdso-gettimeofday := $(addprefix $(obj)/, $(c-obj-vdso-gettimeofday))
	136	asm-obj-vdso := $(addprefix $(obj)/, $(asm-obj-vdso))
	137	obj-vdso := $(c-obj-vdso) $(c-obj-vdso-gettimeofday) $(asm-obj-vdso)
	138
	139	obj-y += vdso.o
	140	extra-y += vdso.lds
	141	CPPFLAGS_vdso.lds += -P -C -U$(ARCH)
	142
	143	# Force dependency (vdso.s includes vdso.so through incbin)
	144	$(obj)/vdso.o: $(obj)/vdso.so
	145
	146	include/generated/vdso32-offsets.h: $(obj)/vdso.so.dbg FORCE
	147	$(call if_changed,vdsosym)
	148
	149	# Strip rule for vdso.so
	150	$(obj)/vdso.so: OBJCOPYFLAGS := -S
	151	$(obj)/vdso.so: $(obj)/vdso.so.dbg FORCE
	152	$(call if_changed,objcopy)
	153
	154	$(obj)/vdso.so.dbg: $(obj)/vdso.so.raw $(obj)/$(munge) FORCE
	155	$(call if_changed,vdsomunge)
	156
	157	# Link rule for the .so file, .lds has to be first
	158	$(obj)/vdso.so.raw: $(src)/vdso.lds $(obj-vdso) FORCE
2e2f3c9b	159	$(call if_changed,vdsold_and_vdso_check)
a7f71a2c VF	160
	161	# Compilation rules for the vDSO sources
	162	$(c-obj-vdso): %.o: %.c FORCE
	163	$(call if_changed_dep,vdsocc)
	164	$(c-obj-vdso-gettimeofday): %.o: %.c FORCE
	165	$(call if_changed_dep,vdsocc_gettimeofday)
	166	$(asm-obj-vdso): %.o: %.S FORCE
	167	$(call if_changed_dep,vdsoas)
	168
	169	# Actual build commands
a88754b2	170	quiet_cmd_vdsold_and_vdso_check = LD32 $@
2e2f3c9b NA	171	cmd_vdsold_and_vdso_check = $(cmd_vdsold); $(cmd_vdso_check)
2e2f3c9b NA	172
a88754b2	173	quiet_cmd_vdsold = LD32 $@
eff9cb67	174	cmd_vdsold = $(CC_COMPAT) -Wp,-MD,$(depfile) $(VDSO_LDFLAGS) \
a7f71a2c	175	-Wl,-T $(filter %.lds,$^) $(filter %.o,$^) -o $@
a88754b2	176	quiet_cmd_vdsocc = CC32 $@
eff9cb67	177	cmd_vdsocc = $(CC_COMPAT) -Wp,-MD,$(depfile) $(VDSO_CFLAGS) -c -o $@ $<
a88754b2	178	quiet_cmd_vdsocc_gettimeofday = CC32 $@
eff9cb67	179	cmd_vdsocc_gettimeofday = $(CC_COMPAT) -Wp,-MD,$(depfile) $(VDSO_CFLAGS) $(VDSO_CFLAGS_gettimeofday_o) -c -o $@ $<
a88754b2	180	quiet_cmd_vdsoas = AS32 $@
eff9cb67	181	cmd_vdsoas = $(CC_COMPAT) -Wp,-MD,$(depfile) $(VDSO_AFLAGS) -c -o $@ $<
a7f71a2c VF	182
	183	quiet_cmd_vdsomunge = MUNGE $@
	184	cmd_vdsomunge = $(obj)/$(munge) $< $@
	185
	186	# Generate vDSO offsets using helper script (borrowed from the 64-bit vDSO)
	187	gen-vdsosym := $(srctree)/$(src)/../vdso/gen_vdso_offsets.sh
	188	quiet_cmd_vdsosym = VDSOSYM $@
	189	# The AArch64 nm should be able to read an AArch32 binary
	190	cmd_vdsosym = $(NM) $< \| $(gen-vdsosym) \| LC_ALL=C sort > $@
	191
	192	# Install commands for the unstripped file
	193	quiet_cmd_vdso_install = INSTALL $@
	194	cmd_vdso_install = cp $(obj)/$@.dbg $(MODLIB)/vdso/vdso32.so
	195
	196	vdso.so: $(obj)/vdso.so.dbg
	197	@mkdir -p $(MODLIB)/vdso
	198	$(call cmd,vdso_install)
	199
	200	vdso_install: vdso.so