projects / thirdparty / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| ec8f24b7 | 1 | # SPDX-License-Identifier: GPL-2.0-only |
| e2c0cdfb PD |
2 | # Copied from arch/tile/kernel/vdso/Makefile |
| 3 | ||
| 4 | # Symbols present in the vdso | |
| 28dfbe6e | 5 | vdso-syms = rt_sigreturn |
| d4c08b97 | 6 | ifdef CONFIG_64BIT |
| 28dfbe6e AW |
7 | vdso-syms += gettimeofday |
| 8 | vdso-syms += clock_gettime | |
| 9 | vdso-syms += clock_getres | |
| d4c08b97 | 10 | endif |
| 28dfbe6e | 11 | vdso-syms += getcpu |
| 921ebd8f | 12 | vdso-syms += flush_icache |
| e2c0cdfb PD |
13 | |
| 14 | # Files to link into the vdso | |
| 0a9f2a61 | 15 | obj-vdso = $(patsubst %, %.o, $(vdso-syms)) note.o |
| e2c0cdfb PD |
16 | |
| 17 | # Build rules | |
| 18 | targets := $(obj-vdso) vdso.so vdso.so.dbg vdso.lds vdso-dummy.o | |
| 19 | obj-vdso := $(addprefix $(obj)/, $(obj-vdso)) | |
| 20 | ||
| 21 | obj-y += vdso.o vdso-syms.o | |
| 22 | CPPFLAGS_vdso.lds += -P -C -U$(ARCH) | |
| 23 | ||
| 24 | # Disable gcov profiling for VDSO code | |
| 25 | GCOV_PROFILE := n | |
| 26 | ||
| 27 | # Force dependency | |
| 28 | $(obj)/vdso.o: $(obj)/vdso.so | |
| 29 | ||
| 30 | # link rule for the .so file, .lds has to be first | |
| 31 | SYSCFLAGS_vdso.so.dbg = $(c_flags) | |
| 32 | $(obj)/vdso.so.dbg: $(src)/vdso.lds $(obj-vdso) FORCE | |
| 33 | $(call if_changed,vdsold) | |
| 34 | ||
| 35 | # We also create a special relocatable object that should mirror the symbol | |
| 3c1918c8 IH |
36 | # table and layout of the linked DSO. With ld --just-symbols we can then |
| 37 | # refer to these symbols in the kernel code rather than hand-coded addresses. | |
| e2c0cdfb PD |
38 | |
| 39 | SYSCFLAGS_vdso.so.dbg = -shared -s -Wl,-soname=linux-vdso.so.1 \ | |
| b399abe7 | 40 | -Wl,--build-id -Wl,--hash-style=both |
| e2c0cdfb PD |
41 | $(obj)/vdso-dummy.o: $(src)/vdso.lds $(obj)/rt_sigreturn.o FORCE |
| 42 | $(call if_changed,vdsold) | |
| 43 | ||
| 3c1918c8 | 44 | LDFLAGS_vdso-syms.o := -r --just-symbols |
| e2c0cdfb PD |
45 | $(obj)/vdso-syms.o: $(obj)/vdso-dummy.o FORCE |
| 46 | $(call if_changed,ld) | |
| 47 | ||
| 48 | # strip rule for the .so file | |
| 49 | $(obj)/%.so: OBJCOPYFLAGS := -S | |
| 50 | $(obj)/%.so: $(obj)/%.so.dbg FORCE | |
| 51 | $(call if_changed,objcopy) | |
| 52 | ||
| 53 | # actual build commands | |
| 54 | # The DSO images are built using a special linker script | |
| 55 | # Add -lgcc so rv32 gets static muldi3 and lshrdi3 definitions. | |
| 56 | # Make sure only to export the intended __vdso_xxx symbol offsets. | |
| 57 | quiet_cmd_vdsold = VDSOLD $@ | |
| 4938c79b PD |
58 | cmd_vdsold = $(CC) $(KBUILD_CFLAGS) $(call cc-option, -no-pie) -nostdlib -nostartfiles $(SYSCFLAGS_$(@F)) \ |
| 59 | -Wl,-T,$(filter-out FORCE,$^) -o $@.tmp && \ | |
| e2c0cdfb | 60 | $(CROSS_COMPILE)objcopy \ |
| 95f4d9cc IH |
61 | $(patsubst %, -G __vdso_%, $(vdso-syms)) $@.tmp $@ && \ |
| 62 | rm $@.tmp | |
| e2c0cdfb PD |
63 | |
| 64 | # install commands for the unstripped file | |
| 65 | quiet_cmd_vdso_install = INSTALL $@ | |
| 66 | cmd_vdso_install = cp $(obj)/$@.dbg $(MODLIB)/vdso/$@ | |
| 67 | ||
| 68 | vdso.so: $(obj)/vdso.so.dbg | |
| 69 | @mkdir -p $(MODLIB)/vdso | |
| 70 | $(call cmd,vdso_install) | |
| 71 | ||
| 72 | vdso_install: vdso.so |