arch/loongarch/vdso/Makefile

Source file repositories/reference/linux-study-clean/arch/loongarch/vdso/Makefile

File Facts

System
Linux kernel
Corpus path
arch/loongarch/vdso/Makefile
Extension
[no extension]
Size
2580 bytes
Lines
92
Domain
Architecture Layer
Bucket
arch/loongarch
Inferred role
Architecture Layer: build/configuration rule
Status
atlas-only

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

# SPDX-License-Identifier: GPL-2.0
# Objects to go into the VDSO.

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

obj-vdso-y := elf.o vgetcpu.o vgetrandom.o \
              vgetrandom-chacha.o sigreturn.o
obj-vdso-$(CONFIG_GENERIC_GETTIMEOFDAY) += vgettimeofday.o

# Common compiler flags between ABIs.
ccflags-vdso := \
	$(filter -I%,$(KBUILD_CFLAGS)) \
	$(filter -E%,$(KBUILD_CFLAGS)) \
	$(filter -m32,$(KBUILD_CFLAGS)) \
	$(filter -m64,$(KBUILD_CFLAGS)) \
	$(filter -march=%,$(KBUILD_CFLAGS)) \
	$(filter -m%-float,$(KBUILD_CFLAGS)) \
	$(CLANG_FLAGS) \
	-D__VDSO__

ifdef CONFIG_32BIT
ccflags-vdso += -DBUILD_VDSO32
endif

cflags-vdso := $(ccflags-vdso) \
	-isystem $(shell $(CC) -print-file-name=include) \
	$(filter -W%,$(filter-out -Wa$(comma)%,$(KBUILD_CFLAGS))) \
	$(CC_FLAGS_DIALECT) -O2 -g -fno-strict-aliasing -fno-common -fno-builtin \
	-fno-stack-protector -fno-jump-tables -DDISABLE_BRANCH_PROFILING \
	$(call cc-option, -fasynchronous-unwind-tables) \
	$(call cc-option, -fno-stack-protector)
aflags-vdso := $(ccflags-vdso) \
	-D__ASSEMBLY__ -Wa,-gdwarf-2

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

ifneq ($(c-getrandom-y),)
  CFLAGS_vgetrandom.o += -include $(c-getrandom-y)
endif

# VDSO linker flags.
ldflags-y := -Bsymbolic --no-undefined -soname=linux-vdso.so.1 \
	$(filter -E%,$(KBUILD_CFLAGS)) -shared --build-id --eh-frame-hdr -T

#
# Shared build commands.
#

quiet_cmd_vdsold_and_vdso_check = LD      $@
      cmd_vdsold_and_vdso_check = $(cmd_ld); $(cmd_vdso_check)

quiet_cmd_vdsoas_o_S = AS       $@
      cmd_vdsoas_o_S = $(CC) $(a_flags) -c -o $@ $<

# 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)

#
# Build native VDSO.
#

native-abi := $(filter -mabi=%,$(KBUILD_CFLAGS))

Annotation

Implementation Notes