projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 87f3248c GR |
1 | # SPDX-License-Identifier: GPL-2.0-only |
| 2 | ||
| aff69273 | 3 | # Include the generic Makefile to check the built vdso. |
| 87f3248c GR |
4 | include $(srctree)/lib/vdso/Makefile |
| 5 | ||
| 6 | # Symbols present in the vdso | |
| 0d3b051a GR |
7 | vdso-syms += rt_sigreturn |
| 8 | vdso-syms += vgettimeofday | |
| 87f3248c GR |
9 | |
| 10 | # Files to link into the vdso | |
| 11 | obj-vdso = $(patsubst %, %.o, $(vdso-syms)) note.o | |
| 12 | ||
| 0d3b051a GR |
13 | ifneq ($(c-gettimeofday-y),) |
| 14 | CFLAGS_vgettimeofday.o += -include $(c-gettimeofday-y) | |
| 15 | endif | |
| 16 | ||
| 17 | ccflags-y := -fno-stack-protector -DBUILD_VDSO32 | |
| 87f3248c GR |
18 | |
| 19 | # Build rules | |
| 20 | targets := $(obj-vdso) vdso.so vdso.so.dbg vdso.lds vdso-dummy.o | |
| 21 | obj-vdso := $(addprefix $(obj)/, $(obj-vdso)) | |
| 22 | ||
| 23 | obj-y += vdso.o vdso-syms.o | |
| 24 | CPPFLAGS_vdso.lds += -P -C -U$(ARCH) | |
| 25 | ||
| 87f3248c GR |
26 | # Force dependency |
| 27 | $(obj)/vdso.o: $(obj)/vdso.so | |
| 28 | ||
| 29 | SYSCFLAGS_vdso.so.dbg = $(c_flags) | |
| b957df3b | 30 | $(obj)/vdso.so.dbg: $(obj)/vdso.lds $(obj-vdso) FORCE |
| 87f3248c GR |
31 | $(call if_changed,vdsold) |
| 32 | SYSCFLAGS_vdso.so.dbg = -shared -s -Wl,-soname=linux-vdso.so.1 \ | |
| 33 | -Wl,--build-id=sha1 -Wl,--hash-style=both | |
| 34 | ||
| 35 | $(obj)/vdso-syms.S: $(obj)/vdso.so FORCE | |
| 36 | $(call if_changed,so2s) | |
| 37 | ||
| 38 | # strip rule for the .so file | |
| 39 | $(obj)/%.so: OBJCOPYFLAGS := -S | |
| 40 | $(obj)/%.so: $(obj)/%.so.dbg FORCE | |
| 41 | $(call if_changed,objcopy) | |
| 42 | ||
| 43 | # actual build commands | |
| 44 | # The DSO images are built using a special linker script | |
| 45 | # Make sure only to export the intended __vdso_xxx symbol offsets. | |
| 46 | quiet_cmd_vdsold = VDSOLD $@ | |
| 47 | cmd_vdsold = $(CC) $(KBUILD_CFLAGS) $(call cc-option, -no-pie) -nostdlib -nostartfiles $(SYSCFLAGS_$(@F)) \ | |
| 48 | -Wl,-T,$(filter-out FORCE,$^) -o $@.tmp && \ | |
| 49 | $(CROSS_COMPILE)objcopy \ | |
| 50 | $(patsubst %, -G __vdso_%, $(vdso-syms)) $@.tmp $@ && \ | |
| 51 | rm $@.tmp | |
| 52 | ||
| 53 | # Extracts symbol offsets from the VDSO, converting them into an assembly file | |
| 54 | # that contains the same symbols at the same offsets. | |
| 55 | quiet_cmd_so2s = SO2S $@ | |
| b1992c37 | 56 | cmd_so2s = $(NM) -D $< | $(src)/so2s.sh > $@ |