arch/parisc/kernel/vdso32/Makefile

Source file repositories/reference/linux-study-clean/arch/parisc/kernel/vdso32/Makefile

File Facts

System
Linux kernel
Corpus path
arch/parisc/kernel/vdso32/Makefile
Extension
[no extension]
Size
2104 bytes
Lines
67
Domain
Architecture Layer
Bucket
arch/parisc
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

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

KCOV_INSTRUMENT := n

# Disable gcov profiling, ubsan and kasan for VDSO code
GCOV_PROFILE := n
UBSAN_SANITIZE := n
KASAN_SANITIZE := n
KCSAN_SANITIZE := n

obj-vdso32 = note.o sigtramp.o restart_syscall.o
obj-cvdso32 = vdso32_generic.o

# Build rules

targets := $(obj-vdso32) $(obj-cvdso32) vdso32.so
obj-vdso32 := $(addprefix $(obj)/, $(obj-vdso32))
obj-cvdso32 := $(addprefix $(obj)/, $(obj-cvdso32))

VDSO_CFLAGS_REMOVE := -pg $(CC_FLAGS_FTRACE)
CFLAGS_REMOVE_vdso32_generic.o = $(VDSO_CFLAGS_REMOVE)

ccflags-y := -shared -fno-common -fbuiltin -mno-fast-indirect-calls -O2 -mno-long-calls
#  -march=1.1 -mschedule=7100LC
ccflags-y += -nostdlib -Wl,-soname=linux-vdso32.so.1 \
		$(call ld-option, -Wl$(comma)--hash-style=sysv)
asflags-y := -D__VDSO32__ -s

KBUILD_AFLAGS += -DBUILD_VDSO
KBUILD_CFLAGS += -DBUILD_VDSO -DDISABLE_BRANCH_PROFILING

VDSO_LIBGCC := $(shell $(CROSS32CC) -print-libgcc-file-name)

obj-y += vdso32_wrapper.o
targets += vdso32.lds
CPPFLAGS_vdso32.lds += -P -C  #  -U$(ARCH)

$(obj)/vdso32_wrapper.o : $(obj)/vdso32.so FORCE

# Force dependency (incbin is bad)
# link rule for the .so file, .lds has to be first
$(obj)/vdso32.so: $(obj)/vdso32.lds $(obj-vdso32) $(obj-cvdso32) $(VDSO_LIBGCC) FORCE
	$(call if_changed,vdso32ld)

# assembly rules for the .S files
$(obj-vdso32): %.o: %.S FORCE
	$(call if_changed_dep,vdso32as)
$(obj-cvdso32): %.o: %.c FORCE
	$(call if_changed_dep,vdso32cc)

# actual build commands
quiet_cmd_vdso32ld = VDSO32L $@
      cmd_vdso32ld = $(CROSS32CC) $(c_flags) -Wl,-T $(filter-out FORCE, $^) -o $@
quiet_cmd_vdso32as = VDSO32A $@
      cmd_vdso32as = $(CROSS32CC) $(a_flags) -c -o $@ $<
quiet_cmd_vdso32cc = VDSO32C $@
      cmd_vdso32cc = $(CROSS32CC) $(c_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/vdso32-offsets.h: $(obj)/vdso32.so FORCE
	$(call if_changed,vdsosym)

Annotation

Implementation Notes