projects / mirror_ubuntu-bionic-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 9031fefd WD |
1 | # |
| 2 | # Building a vDSO image for AArch64. | |
| 3 | # | |
| 4 | # Author: Will Deacon <will.deacon@arm.com> | |
| 5 | # Heavily based on the vDSO Makefiles for other archs. | |
| 6 | # | |
| 7 | ||
| 8 | obj-vdso := gettimeofday.o note.o sigreturn.o | |
| 9 | ||
| 10 | # Build rules | |
| 11 | targets := $(obj-vdso) vdso.so vdso.so.dbg | |
| 12 | obj-vdso := $(addprefix $(obj)/, $(obj-vdso)) | |
| 13 | ||
| 14 | ccflags-y := -shared -fno-common -fno-builtin | |
| 15 | ccflags-y += -nostdlib -Wl,-soname=linux-vdso.so.1 \ | |
| 16 | $(call cc-ldoption, -Wl$(comma)--hash-style=sysv) | |
| 17 | ||
| 6f1a6ae8 WD |
18 | # Workaround for bare-metal (ELF) toolchains that neglect to pass -shared |
| 19 | # down to collect2, resulting in silent corruption of the vDSO image. | |
| 20 | ccflags-y += -Wl,-shared | |
| 21 | ||
| 9031fefd WD |
22 | obj-y += vdso.o |
| 23 | extra-y += vdso.lds vdso-offsets.h | |
| 24 | CPPFLAGS_vdso.lds += -P -C -U$(ARCH) | |
| 25 | ||
| 26 | # Force dependency (incbin is bad) | |
| 27 | $(obj)/vdso.o : $(obj)/vdso.so | |
| 28 | ||
| 29 | # Link rule for the .so file, .lds has to be first | |
| 30 | $(obj)/vdso.so.dbg: $(src)/vdso.lds $(obj-vdso) | |
| 31 | $(call if_changed,vdsold) | |
| 32 | ||
| 33 | # Strip rule for the .so file | |
| 34 | $(obj)/%.so: OBJCOPYFLAGS := -S | |
| 35 | $(obj)/%.so: $(obj)/%.so.dbg FORCE | |
| 36 | $(call if_changed,objcopy) | |
| 37 | ||
| 38 | # Generate VDSO offsets using helper script | |
| 39 | gen-vdsosym := $(srctree)/$(src)/gen_vdso_offsets.sh | |
| 40 | quiet_cmd_vdsosym = VDSOSYM $@ | |
| 41 | define cmd_vdsosym | |
| 42 | $(NM) $< | $(gen-vdsosym) | LC_ALL=C sort > $@ && \ | |
| 43 | cp $@ include/generated/ | |
| 44 | endef | |
| 45 | ||
| 46 | $(obj)/vdso-offsets.h: $(obj)/vdso.so.dbg FORCE | |
| 47 | $(call if_changed,vdsosym) | |
| 48 | ||
| 49 | # Assembly rules for the .S files | |
| 1915e2ad | 50 | $(obj-vdso): %.o: %.S FORCE |
| 9031fefd WD |
51 | $(call if_changed_dep,vdsoas) |
| 52 | ||
| 53 | # Actual build commands | |
| ad789ba5 | 54 | quiet_cmd_vdsold = VDSOL $@ |
| 40507403 | 55 | cmd_vdsold = $(CC) $(c_flags) -Wl,-n -Wl,-T $^ -o $@ |
| ad789ba5 | 56 | quiet_cmd_vdsoas = VDSOA $@ |
| 9031fefd WD |
57 | cmd_vdsoas = $(CC) $(a_flags) -c -o $@ $< |
| 58 | ||
| 59 | # Install commands for the unstripped file | |
| 60 | quiet_cmd_vdso_install = INSTALL $@ | |
| 61 | cmd_vdso_install = cp $(obj)/$@.dbg $(MODLIB)/vdso/$@ | |
| 62 | ||
| 63 | vdso.so: $(obj)/vdso.so.dbg | |
| 64 | @mkdir -p $(MODLIB)/vdso | |
| 65 | $(call cmd,vdso_install) | |
| 66 | ||
| 67 | vdso_install: vdso.so |