[linux-block.git] / arch / arm64 / kernel / vdso / Makefile

# SPDX-License-Identifier: GPL-2.0
#
# Building a vDSO image for AArch64.
#
# Author: Will Deacon <will.deacon@arm.com>
# Heavily based on the vDSO Makefiles for other archs.
#

# Include the generic Makefile to check the built vdso.
include $(srctree)/lib/vdso/Makefile

obj-vdso := vgettimeofday.o note.o sigreturn.o

# Build rules
targets := $(obj-vdso) vdso.so vdso.so.dbg
obj-vdso := $(addprefix $(obj)/, $(obj-vdso))

btildflags-$(CONFIG_ARM64_BTI_KERNEL) += -z force-bti

# -Bsymbolic has been added for consistency with arm, the compat vDSO and
# potential future proofing if we end up with internal calls to the exported
# routines, as x86 does (see 6f121e548f83 ("x86, vdso: Reimplement vdso.so
# preparation in build-time C")).
ldflags-y := -shared -soname=linux-vdso.so.1 --hash-style=sysv	\
	     -Bsymbolic --build-id=sha1 -n $(btildflags-y)

ifdef CONFIG_LD_ORPHAN_WARN
  ldflags-y += --orphan-handling=$(CONFIG_LD_ORPHAN_WARN_LEVEL)
endif

ldflags-y += -T

ccflags-y := -fno-common -fno-builtin -fno-stack-protector -ffixed-x18
ccflags-y += -DDISABLE_BRANCH_PROFILING -DBUILD_VDSO

# -Wmissing-prototypes and -Wmissing-declarations are removed from
# the CFLAGS of vgettimeofday.c to make possible to build the
# kernel with CONFIG_WERROR enabled.
CFLAGS_REMOVE_vgettimeofday.o = $(CC_FLAGS_FTRACE) -Os $(CC_FLAGS_SCS) \
				$(RANDSTRUCT_CFLAGS) $(GCC_PLUGINS_CFLAGS) \
				$(CC_FLAGS_LTO) $(CC_FLAGS_CFI) \
				-Wmissing-prototypes -Wmissing-declarations

CFLAGS_vgettimeofday.o = -O2 -mcmodel=tiny -fasynchronous-unwind-tables

ifneq ($(c-gettimeofday-y),)
  CFLAGS_vgettimeofday.o += -include $(c-gettimeofday-y)
endif

targets += vdso.lds
CPPFLAGS_vdso.lds += -P -C -U$(ARCH)

# Link rule for the .so file, .lds has to be first
$(obj)/vdso.so.dbg: $(obj)/vdso.lds $(obj-vdso) FORCE
	$(call if_changed,vdsold_and_vdso_check)

# Strip rule for the .so file
$(obj)/%.so: OBJCOPYFLAGS := -S
$(obj)/%.so: $(obj)/%.so.dbg FORCE
	$(call if_changed,objcopy)

# Generate VDSO offsets using helper script
gen-vdsosym := $(src)/gen_vdso_offsets.sh
quiet_cmd_vdsosym = VDSOSYM $@
      cmd_vdsosym = $(NM) $< | $(gen-vdsosym) | LC_ALL=C sort > $@

include/generated/vdso-offsets.h: $(obj)/vdso.so.dbg FORCE
	$(call if_changed,vdsosym)

# Actual build commands
quiet_cmd_vdsold_and_vdso_check = LD      $@
      cmd_vdsold_and_vdso_check = $(cmd_ld); $(cmd_vdso_check)
Commit	Line	Data
b2441318	1	# SPDX-License-Identifier: GPL-2.0
9031fefd WD	2	#
	3	# Building a vDSO image for AArch64.
	4	#
	5	# Author: Will Deacon <will.deacon@arm.com>
	6	# Heavily based on the vDSO Makefiles for other archs.
	7	#
	8
aff69273	9	# Include the generic Makefile to check the built vdso.
28b1a824 VF	10	include $(srctree)/lib/vdso/Makefile
	11
	12	obj-vdso := vgettimeofday.o note.o sigreturn.o
9031fefd WD	13
	14	# Build rules
	15	targets := $(obj-vdso) vdso.so vdso.so.dbg
	16	obj-vdso := $(addprefix $(obj)/, $(obj-vdso))
	17
5e02a188 MB	18	btildflags-$(CONFIG_ARM64_BTI_KERNEL) += -z force-bti
5e02a188 MB	19
86b87837 VF	20	# -Bsymbolic has been added for consistency with arm, the compat vDSO and
	21	# potential future proofing if we end up with internal calls to the exported
	22	# routines, as x86 does (see 6f121e548f83 ("x86, vdso: Reimplement vdso.so
	23	# preparation in build-time C")).
34688c76	24	ldflags-y := -shared -soname=linux-vdso.so.1 --hash-style=sysv \
e0ab20b2 JG	25	-Bsymbolic --build-id=sha1 -n $(btildflags-y)
	26
	27	ifdef CONFIG_LD_ORPHAN_WARN
e1789d7c	28	ldflags-y += --orphan-handling=$(CONFIG_LD_ORPHAN_WARN_LEVEL)
e0ab20b2 JG	29	endif
	30
	31	ldflags-y += -T
9031fefd	32
98cd3c3f	33	ccflags-y := -fno-common -fno-builtin -fno-stack-protector -ffixed-x18
e35123d8	34	ccflags-y += -DDISABLE_BRANCH_PROFILING -DBUILD_VDSO
28b1a824	35
58cd4a08 VF	36	# -Wmissing-prototypes and -Wmissing-declarations are removed from
	37	# the CFLAGS of vgettimeofday.c to make possible to build the
	38	# kernel with CONFIG_WERROR enabled.
613f4b3e KC	39	CFLAGS_REMOVE_vgettimeofday.o = $(CC_FLAGS_FTRACE) -Os $(CC_FLAGS_SCS) \
613f4b3e KC	40	$(RANDSTRUCT_CFLAGS) $(GCC_PLUGINS_CFLAGS) \
f143ff39 ST	41	$(CC_FLAGS_LTO) $(CC_FLAGS_CFI) \
f143ff39 ST	42	-Wmissing-prototypes -Wmissing-declarations
28b1a824	43
1578e5d0	44	CFLAGS_vgettimeofday.o = -O2 -mcmodel=tiny -fasynchronous-unwind-tables
a88754b2 VF	45
	46	ifneq ($(c-gettimeofday-y),)
	47	CFLAGS_vgettimeofday.o += -include $(c-gettimeofday-y)
28b1a824 VF	48	endif
28b1a824 VF	49
887af6d7	50	targets += vdso.lds
9031fefd WD	51	CPPFLAGS_vdso.lds += -P -C -U$(ARCH)
9031fefd WD	52
9031fefd	53	# Link rule for the .so file, .lds has to be first
697e96ed	54	$(obj)/vdso.so.dbg: $(obj)/vdso.lds $(obj-vdso) FORCE
2e2f3c9b	55	$(call if_changed,vdsold_and_vdso_check)
9031fefd WD	56
	57	# Strip rule for the .so file
	58	$(obj)/%.so: OBJCOPYFLAGS := -S
	59	$(obj)/%.so: $(obj)/%.so.dbg FORCE
	60	$(call if_changed,objcopy)
	61
	62	# Generate VDSO offsets using helper script
b1992c37	63	gen-vdsosym := $(src)/gen_vdso_offsets.sh
9031fefd	64	quiet_cmd_vdsosym = VDSOSYM $@
697e96ed	65	cmd_vdsosym = $(NM) $< \| $(gen-vdsosym) \| LC_ALL=C sort > $@
9031fefd	66
a66649da	67	include/generated/vdso-offsets.h: $(obj)/vdso.so.dbg FORCE
9031fefd WD	68	$(call if_changed,vdsosym)
9031fefd WD	69
9031fefd	70	# Actual build commands
2e2f3c9b NA	71	quiet_cmd_vdsold_and_vdso_check = LD $@
2e2f3c9b NA	72	cmd_vdsold_and_vdso_check = $(cmd_ld); $(cmd_vdso_check)