arch/sparc/vdso/Makefile

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

File Facts

System
Linux kernel
Corpus path
arch/sparc/vdso/Makefile
Extension
[no extension]
Size
3942 bytes
Lines
115
Domain
Architecture Layer
Bucket
arch/sparc
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-only
#
# Building vDSO images for sparc.
#

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

# files to link into the vdso
vobjs-y := vdso-note.o vclock_gettime.o

# files to link into kernel
obj-y				+= vma.o

# vDSO images to build
obj-$(CONFIG_SPARC64)		+= vdso-image-64.o
obj-$(CONFIG_COMPAT)		+= vdso-image-32.o

vobjs := $(addprefix $(obj)/, $(vobjs-y))

$(obj)/vdso.o: $(obj)/vdso.so

targets += vdso.lds $(vobjs-y)
targets += $(foreach x, 32 64, vdso-image-$(x).c vdso$(x).so vdso$(x).so.dbg)

CPPFLAGS_vdso.lds += -P -C

VDSO_LDFLAGS_vdso.lds = -m elf64_sparc -soname linux-vdso.so.1 \
			-z max-page-size=8192

$(obj)/vdso64.so.dbg: $(obj)/vdso.lds $(vobjs) FORCE
	$(call if_changed,vdso)

HOST_EXTRACFLAGS += -I$(srctree)/tools/include
hostprogs += vdso2c

quiet_cmd_vdso2c = VDSO2C  $@
      cmd_vdso2c = $(obj)/vdso2c $< $(<:%.dbg=%) $@

$(obj)/vdso-image-%.c: $(obj)/vdso%.so.dbg $(obj)/vdso%.so $(obj)/vdso2c FORCE
	$(call if_changed,vdso2c)

#
# Don't omit frame pointers for ease of userspace debugging, but do
# optimize sibling calls.
#
CFL := $(PROFILING) -mcmodel=medlow -fPIC -O2 -fasynchronous-unwind-tables -m64 \
       $(filter -g%,$(KBUILD_CFLAGS)) -fno-stack-protector \
       -fno-omit-frame-pointer -foptimize-sibling-calls \
       -DDISABLE_BRANCH_PROFILING -DBUILD_VDSO

SPARC_REG_CFLAGS = -ffixed-g4 -ffixed-g5 $(call cc-option,-fcall-used-g5) $(call cc-option,-fcall-used-g7)

$(vobjs): KBUILD_CFLAGS := $(filter-out $(RANDSTRUCT_CFLAGS) $(KSTACK_ERASE_CFLAGS) $(GCC_PLUGINS_CFLAGS) $(SPARC_REG_CFLAGS),$(KBUILD_CFLAGS)) $(CFL)

#
# vDSO code runs in userspace and -pg doesn't help with profiling anyway.
#
CFLAGS_REMOVE_vclock_gettime.o = -pg
CFLAGS_REMOVE_vdso32/vclock_gettime.o = -pg

$(obj)/%.so: OBJCOPYFLAGS := -S
$(obj)/%.so: $(obj)/%.so.dbg FORCE
	$(call if_changed,objcopy)

CPPFLAGS_vdso32/vdso32.lds = $(CPPFLAGS_vdso.lds)
VDSO_LDFLAGS_vdso32.lds = -m elf32_sparc -soname linux-gate.so.1

#This makes sure the $(obj) subdirectory exists even though vdso32/
#is not a kbuild sub-make subdirectory

Annotation

Implementation Notes