| Richard Weinberger | f1c2bb8 | 2011-07-25 17:12:54 -0700 | [diff] [blame] | 1 | # |
| 2 | # Building vDSO images for x86. |
| 3 | # |
| 4 | |
| 5 | VDSO64-y := y |
| 6 | |
| 7 | vdso-install-$(VDSO64-y) += vdso.so |
| 8 | |
| 9 | |
| 10 | # files to link into the vdso |
| 11 | vobjs-y := vdso-note.o um_vdso.o |
| 12 | |
| 13 | # files to link into kernel |
| 14 | obj-$(VDSO64-y) += vdso.o vma.o |
| 15 | |
| 16 | vobjs := $(foreach F,$(vobjs-y),$(obj)/$F) |
| 17 | |
| 18 | $(obj)/vdso.o: $(obj)/vdso.so |
| 19 | |
| 20 | targets += vdso.so vdso.so.dbg vdso.lds $(vobjs-y) |
| 21 | |
| 22 | export CPPFLAGS_vdso.lds += -P -C |
| 23 | |
| 24 | VDSO_LDFLAGS_vdso.lds = -m64 -Wl,-soname=linux-vdso.so.1 \ |
| 25 | -Wl,-z,max-page-size=4096 -Wl,-z,common-page-size=4096 |
| 26 | |
| 27 | $(obj)/vdso.o: $(src)/vdso.S $(obj)/vdso.so |
| 28 | |
| 29 | $(obj)/vdso.so.dbg: $(src)/vdso.lds $(vobjs) FORCE |
| 30 | $(call if_changed,vdso) |
| 31 | |
| 32 | $(obj)/%.so: OBJCOPYFLAGS := -S |
| 33 | $(obj)/%.so: $(obj)/%.so.dbg FORCE |
| 34 | $(call if_changed,objcopy) |
| 35 | |
| 36 | # |
| 37 | # Don't omit frame pointers for ease of userspace debugging, but do |
| 38 | # optimize sibling calls. |
| 39 | # |
| 40 | CFL := $(PROFILING) -mcmodel=small -fPIC -O2 -fasynchronous-unwind-tables -m64 \ |
| 41 | $(filter -g%,$(KBUILD_CFLAGS)) $(call cc-option, -fno-stack-protector) \ |
| 42 | -fno-omit-frame-pointer -foptimize-sibling-calls |
| 43 | |
| 44 | $(vobjs): KBUILD_CFLAGS += $(CFL) |
| 45 | |
| 46 | # |
| 47 | # vDSO code runs in userspace and -pg doesn't help with profiling anyway. |
| 48 | # |
| Al Viro | 4d21109 | 2011-08-18 20:11:49 +0100 | [diff] [blame] | 49 | CFLAGS_REMOVE_vdso-note.o = -pg -fprofile-arcs -ftest-coverage |
| 50 | CFLAGS_REMOVE_um_vdso.o = -pg -fprofile-arcs -ftest-coverage |
| Richard Weinberger | f1c2bb8 | 2011-07-25 17:12:54 -0700 | [diff] [blame] | 51 | |
| 52 | targets += vdso-syms.lds |
| 53 | obj-$(VDSO64-y) += vdso-syms.lds |
| 54 | |
| 55 | # |
| 56 | # Match symbols in the DSO that look like VDSO*; produce a file of constants. |
| 57 | # |
| 58 | sed-vdsosym := -e 's/^00*/0/' \ |
| 59 | -e 's/^\([0-9a-fA-F]*\) . \(VDSO[a-zA-Z0-9_]*\)$$/\2 = 0x\1;/p' |
| 60 | quiet_cmd_vdsosym = VDSOSYM $@ |
| 61 | define cmd_vdsosym |
| 62 | $(NM) $< | LC_ALL=C sed -n $(sed-vdsosym) | LC_ALL=C sort > $@ |
| 63 | endef |
| 64 | |
| 65 | $(obj)/%-syms.lds: $(obj)/%.so.dbg FORCE |
| 66 | $(call if_changed,vdsosym) |
| 67 | |
| 68 | # |
| 69 | # The DSO images are built using a special linker script. |
| 70 | # |
| 71 | quiet_cmd_vdso = VDSO $@ |
| 72 | cmd_vdso = $(CC) -nostdlib -o $@ \ |
| 73 | $(VDSO_LDFLAGS) $(VDSO_LDFLAGS_$(filter %.lds,$(^F))) \ |
| 74 | -Wl,-T,$(filter %.lds,$^) $(filter %.o,$^) && \ |
| 75 | sh $(srctree)/$(src)/checkundef.sh '$(NM)' '$@' |
| 76 | |
| 77 | VDSO_LDFLAGS = -fPIC -shared $(call cc-ldoption, -Wl$(comma)--hash-style=sysv) |
| 78 | GCOV_PROFILE := n |
| 79 | |
| 80 | # |
| 81 | # Install the unstripped copy of vdso*.so listed in $(vdso-install-y). |
| 82 | # |
| 83 | quiet_cmd_vdso_install = INSTALL $@ |
| 84 | cmd_vdso_install = cp $(obj)/$@.dbg $(MODLIB)/vdso/$@ |
| 85 | $(vdso-install-y): %.so: $(obj)/%.so.dbg FORCE |
| 86 | @mkdir -p $(MODLIB)/vdso |
| 87 | $(call cmd,vdso_install) |
| 88 | |
| 89 | PHONY += vdso_install $(vdso-install-y) |
| 90 | vdso_install: $(vdso-install-y) |