OSCL-LXR

0001 # SPDX-License-Identifier: GPL-2.0
0002 # List of files in the vdso
0003
0004 KCOV_INSTRUMENT := n
0005 ARCH_REL_TYPE_ABS := R_390_COPY|R_390_GLOB_DAT|R_390_JMP_SLOT|R_390_RELATIVE
0006 ARCH_REL_TYPE_ABS += R_390_GOT|R_390_PLT
0007
0008 include $(srctree)/lib/vdso/Makefile
0009 obj-vdso64 = vdso_user_wrapper.o note.o
0010 obj-cvdso64 = vdso64_generic.o getcpu.o
0011 VDSO_CFLAGS_REMOVE := -pg $(CC_FLAGS_FTRACE) $(CC_FLAGS_EXPOLINE) $(CC_FLAGS_CHECK_STACK)
0012 CFLAGS_REMOVE_getcpu.o = $(VDSO_CFLAGS_REMOVE)
0013 CFLAGS_REMOVE_vdso64_generic.o = $(VDSO_CFLAGS_REMOVE)
0014
0015 # Build rules
0016
0017 targets := $(obj-vdso64) $(obj-cvdso64) vdso64.so vdso64.so.dbg
0018 obj-vdso64 := $(addprefix $(obj)/, $(obj-vdso64))
0019 obj-cvdso64 := $(addprefix $(obj)/, $(obj-cvdso64))
0020
0021 KBUILD_AFLAGS += -DBUILD_VDSO
0022 KBUILD_CFLAGS += -DBUILD_VDSO -DDISABLE_BRANCH_PROFILING
0023
0024 KBUILD_AFLAGS_64 := $(filter-out -m64,$(KBUILD_AFLAGS))
0025 KBUILD_AFLAGS_64 += -m64 -s
0026
0027 KBUILD_CFLAGS_64 := $(filter-out -m64,$(KBUILD_CFLAGS))
0028 KBUILD_CFLAGS_64 += -m64 -fPIC -shared -fno-common -fno-builtin
0029 ldflags-y := -fPIC -shared -soname=linux-vdso64.so.1 \
0030              --hash-style=both --build-id=sha1 -T
0031
0032 $(targets:%=$(obj)/%.dbg): KBUILD_CFLAGS = $(KBUILD_CFLAGS_64)
0033 $(targets:%=$(obj)/%.dbg): KBUILD_AFLAGS = $(KBUILD_AFLAGS_64)
0034
0035 obj-y += vdso64_wrapper.o
0036 targets += vdso64.lds
0037 CPPFLAGS_vdso64.lds += -P -C -U$(ARCH)
0038
0039 # Disable gcov profiling, ubsan and kasan for VDSO code
0040 GCOV_PROFILE := n
0041 UBSAN_SANITIZE := n
0042 KASAN_SANITIZE := n
0043 KCSAN_SANITIZE := n
0044
0045 # Force dependency (incbin is bad)
0046 $(obj)/vdso64_wrapper.o : $(obj)/vdso64.so
0047
0048 # link rule for the .so file, .lds has to be first
0049 $(obj)/vdso64.so.dbg: $(src)/vdso64.lds $(obj-vdso64) $(obj-cvdso64) FORCE
0050         $(call if_changed,ld)
0051
0052 # strip rule for the .so file
0053 $(obj)/%.so: OBJCOPYFLAGS := -S
0054 $(obj)/%.so: $(obj)/%.so.dbg FORCE
0055         $(call if_changed,objcopy)
0056
0057 # assembly rules for the .S files
0058 $(obj-vdso64): %.o: %.S FORCE
0059         $(call if_changed_dep,vdso64as)
0060
0061 $(obj-cvdso64): %.o: %.c FORCE
0062         $(call if_changed_dep,vdso64cc)
0063
0064 # actual build commands
0065 quiet_cmd_vdso64as = VDSO64A $@
0066       cmd_vdso64as = $(CC) $(a_flags) -c -o $@ $<
0067 quiet_cmd_vdso64cc = VDSO64C $@
0068       cmd_vdso64cc = $(CC) $(c_flags) -c -o $@ $<
0069
0070 # install commands for the unstripped file
0071 quiet_cmd_vdso_install = INSTALL $@
0072       cmd_vdso_install = cp $(obj)/$@.dbg $(MODLIB)/vdso/$@
0073
0074 vdso64.so: $(obj)/vdso64.so.dbg
0075         @mkdir -p $(MODLIB)/vdso
0076         $(call cmd,vdso_install)
0077
0078 vdso_install: vdso64.so
0079
0080 # Generate VDSO offsets using helper script
0081 gen-vdsosym := $(srctree)/$(src)/gen_vdso_offsets.sh
0082 quiet_cmd_vdsosym = VDSOSYM $@
0083         cmd_vdsosym = $(NM) $< | $(gen-vdsosym) | LC_ALL=C sort > $@
0084
0085 include/generated/vdso64-offsets.h: $(obj)/vdso64.so.dbg FORCE
0086         $(call if_changed,vdsosym)