projects / mirror_ubuntu-focal-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| b2441318 | 1 | # SPDX-License-Identifier: GPL-2.0 |
| 9031fefd WD |
2 | # |
| 3 | # Building a vDSO image for AArch64. | |
| 4 | # | |
| 5 | # Author: Will Deacon <will.deacon@arm.com> | |
| 6 | # Heavily based on the vDSO Makefiles for other archs. | |
| 7 | # | |
| 8 | ||
| 28b1a824 VF |
9 | # Absolute relocation type $(ARCH_REL_TYPE_ABS) needs to be defined before |
| 10 | # the inclusion of generic Makefile. | |
| 11 | ARCH_REL_TYPE_ABS := R_AARCH64_JUMP_SLOT|R_AARCH64_GLOB_DAT|R_AARCH64_ABS64 | |
| 12 | include $(srctree)/lib/vdso/Makefile | |
| 13 | ||
| 14 | obj-vdso := vgettimeofday.o note.o sigreturn.o | |
| 9031fefd WD |
15 | |
| 16 | # Build rules | |
| 17 | targets := $(obj-vdso) vdso.so vdso.so.dbg | |
| 18 | obj-vdso := $(addprefix $(obj)/, $(obj-vdso)) | |
| 19 | ||
| 7a0a93c5 LA |
20 | ldflags-y := -shared -nostdlib -soname=linux-vdso.so.1 --hash-style=sysv \ |
| 21 | --build-id -n -T | |
| 9031fefd | 22 | |
| 98cd3c3f | 23 | ccflags-y := -fno-common -fno-builtin -fno-stack-protector -ffixed-x18 |
| 28b1a824 VF |
24 | ccflags-y += -DDISABLE_BRANCH_PROFILING |
| 25 | ||
| 26 | VDSO_LDFLAGS := -Bsymbolic | |
| 27 | ||
| 28 | CFLAGS_REMOVE_vgettimeofday.o = $(CC_FLAGS_FTRACE) -Os | |
| 29 | KBUILD_CFLAGS += $(DISABLE_LTO) | |
| 30 | KASAN_SANITIZE := n | |
| 31 | UBSAN_SANITIZE := n | |
| 32 | OBJECT_FILES_NON_STANDARD := y | |
| 33 | KCOV_INSTRUMENT := n | |
| 34 | ||
| 7174b077 | 35 | CFLAGS_vgettimeofday.o = -O2 -mcmodel=tiny -fasynchronous-unwind-tables |
| a88754b2 VF |
36 | |
| 37 | ifneq ($(c-gettimeofday-y),) | |
| 38 | CFLAGS_vgettimeofday.o += -include $(c-gettimeofday-y) | |
| 28b1a824 VF |
39 | endif |
| 40 | ||
| 3acf4be2 VF |
41 | # Clang versions less than 8 do not support -mcmodel=tiny |
| 42 | ifeq ($(CONFIG_CC_IS_CLANG), y) | |
| 43 | ifeq ($(shell test $(CONFIG_CLANG_VERSION) -lt 80000; echo $$?),0) | |
| 44 | CFLAGS_REMOVE_vgettimeofday.o += -mcmodel=tiny | |
| 45 | endif | |
| 46 | endif | |
| 47 | ||
| 54309784 AB |
48 | # Disable gcov profiling for VDSO code |
| 49 | GCOV_PROFILE := n | |
| 50 | ||
| 9031fefd | 51 | obj-y += vdso.o |
| a66649da | 52 | extra-y += vdso.lds |
| 9031fefd WD |
53 | CPPFLAGS_vdso.lds += -P -C -U$(ARCH) |
| 54 | ||
| 55 | # Force dependency (incbin is bad) | |
| 56 | $(obj)/vdso.o : $(obj)/vdso.so | |
| 57 | ||
| 58 | # Link rule for the .so file, .lds has to be first | |
| 697e96ed | 59 | $(obj)/vdso.so.dbg: $(obj)/vdso.lds $(obj-vdso) FORCE |
| 2e2f3c9b | 60 | $(call if_changed,vdsold_and_vdso_check) |
| 9031fefd WD |
61 | |
| 62 | # Strip rule for the .so file | |
| 63 | $(obj)/%.so: OBJCOPYFLAGS := -S | |
| 64 | $(obj)/%.so: $(obj)/%.so.dbg FORCE | |
| 65 | $(call if_changed,objcopy) | |
| 66 | ||
| 67 | # Generate VDSO offsets using helper script | |
| 68 | gen-vdsosym := $(srctree)/$(src)/gen_vdso_offsets.sh | |
| 69 | quiet_cmd_vdsosym = VDSOSYM $@ | |
| 697e96ed | 70 | cmd_vdsosym = $(NM) $< | $(gen-vdsosym) | LC_ALL=C sort > $@ |
| 9031fefd | 71 | |
| a66649da | 72 | include/generated/vdso-offsets.h: $(obj)/vdso.so.dbg FORCE |
| 9031fefd WD |
73 | $(call if_changed,vdsosym) |
| 74 | ||
| 9031fefd | 75 | # Actual build commands |
| 2e2f3c9b NA |
76 | quiet_cmd_vdsold_and_vdso_check = LD $@ |
| 77 | cmd_vdsold_and_vdso_check = $(cmd_ld); $(cmd_vdso_check) | |
| 78 | ||
| 9031fefd WD |
79 | # Install commands for the unstripped file |
| 80 | quiet_cmd_vdso_install = INSTALL $@ | |
| 81 | cmd_vdso_install = cp $(obj)/$@.dbg $(MODLIB)/vdso/$@ | |
| 82 | ||
| 83 | vdso.so: $(obj)/vdso.so.dbg | |
| 84 | @mkdir -p $(MODLIB)/vdso | |
| 85 | $(call cmd,vdso_install) | |
| 86 | ||
| 87 | vdso_install: vdso.so |