projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| c6b99bed HC |
1 | # SPDX-License-Identifier: GPL-2.0 |
| 2 | # Objects to go into the VDSO. | |
| 3 | ||
| aff69273 | 4 | # Include the generic Makefile to check the built vdso. |
| c6b99bed HC |
5 | include $(srctree)/lib/vdso/Makefile |
| 6 | ||
| dce6098b | 7 | obj-vdso-y := elf.o vgetcpu.o vgettimeofday.o sigreturn.o |
| c6b99bed HC |
8 | |
| 9 | # Common compiler flags between ABIs. | |
| 10 | ccflags-vdso := \ | |
| 11 | $(filter -I%,$(KBUILD_CFLAGS)) \ | |
| 12 | $(filter -E%,$(KBUILD_CFLAGS)) \ | |
| 13 | $(filter -march=%,$(KBUILD_CFLAGS)) \ | |
| 14 | $(filter -m%-float,$(KBUILD_CFLAGS)) \ | |
| b89673a9 | 15 | $(CLANG_FLAGS) \ |
| c6b99bed HC |
16 | -D__VDSO__ |
| 17 | ||
| c6b99bed | 18 | cflags-vdso := $(ccflags-vdso) \ |
| e6ee9023 | 19 | -isystem $(shell $(CC) -print-file-name=include) \ |
| c6b99bed | 20 | $(filter -W%,$(filter-out -Wa$(comma)%,$(KBUILD_CFLAGS))) \ |
| 38b10b26 | 21 | -O2 -g -fno-strict-aliasing -fno-common -fno-builtin \ |
| c6b99bed HC |
22 | -fno-stack-protector -fno-jump-tables -DDISABLE_BRANCH_PROFILING \ |
| 23 | $(call cc-option, -fno-asynchronous-unwind-tables) \ | |
| 24 | $(call cc-option, -fno-stack-protector) | |
| 25 | aflags-vdso := $(ccflags-vdso) \ | |
| 26 | -D__ASSEMBLY__ -Wa,-gdwarf-2 | |
| 27 | ||
| 28 | ifneq ($(c-gettimeofday-y),) | |
| 29 | CFLAGS_vgettimeofday.o += -include $(c-gettimeofday-y) | |
| 30 | endif | |
| 31 | ||
| 32 | # VDSO linker flags. | |
| 33 | ldflags-y := -Bsymbolic --no-undefined -soname=linux-vdso.so.1 \ | |
| 34 | $(filter -E%,$(KBUILD_CFLAGS)) -nostdlib -shared \ | |
| 35 | --hash-style=sysv --build-id -T | |
| 36 | ||
| c6b99bed HC |
37 | # |
| 38 | # Shared build commands. | |
| 39 | # | |
| 40 | ||
| 41 | quiet_cmd_vdsold_and_vdso_check = LD $@ | |
| 42 | cmd_vdsold_and_vdso_check = $(cmd_ld); $(cmd_vdso_check) | |
| 43 | ||
| 44 | quiet_cmd_vdsoas_o_S = AS $@ | |
| 45 | cmd_vdsoas_o_S = $(CC) $(a_flags) -c -o $@ $< | |
| 46 | ||
| 47 | # Generate VDSO offsets using helper script | |
| b1992c37 | 48 | gen-vdsosym := $(src)/gen_vdso_offsets.sh |
| c6b99bed HC |
49 | quiet_cmd_vdsosym = VDSOSYM $@ |
| 50 | cmd_vdsosym = $(NM) $< | $(gen-vdsosym) | LC_ALL=C sort > $@ | |
| 51 | ||
| 52 | include/generated/vdso-offsets.h: $(obj)/vdso.so.dbg FORCE | |
| 53 | $(call if_changed,vdsosym) | |
| 54 | ||
| 55 | # | |
| 56 | # Build native VDSO. | |
| 57 | # | |
| 58 | ||
| 59 | native-abi := $(filter -mabi=%,$(KBUILD_CFLAGS)) | |
| 60 | ||
| 61 | targets += $(obj-vdso-y) | |
| 62 | targets += vdso.lds vdso.so.dbg vdso.so | |
| 63 | ||
| 64 | obj-vdso := $(obj-vdso-y:%.o=$(obj)/%.o) | |
| 65 | ||
| 66 | $(obj-vdso): KBUILD_CFLAGS := $(cflags-vdso) $(native-abi) | |
| 67 | $(obj-vdso): KBUILD_AFLAGS := $(aflags-vdso) $(native-abi) | |
| 68 | ||
| 69 | $(obj)/vdso.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) $(native-abi) | |
| 70 | ||
| 71 | $(obj)/vdso.so.dbg: $(obj)/vdso.lds $(obj-vdso) FORCE | |
| 72 | $(call if_changed,vdsold_and_vdso_check) | |
| 73 | ||
| 74 | $(obj)/vdso.so: OBJCOPYFLAGS := -S | |
| 75 | $(obj)/vdso.so: $(obj)/vdso.so.dbg FORCE | |
| 76 | $(call if_changed,objcopy) | |
| 77 | ||
| 78 | obj-y += vdso.o | |
| 79 | ||
| 80 | $(obj)/vdso.o : $(obj)/vdso.so |