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authorJames Hogan <james.hogan@imgtec.com>2016-05-13 19:41:06 +0100
committerRalf Baechle <ralf@linux-mips.org>2016-05-13 22:47:39 +0200
commit2afb97454347f641dd2435a3956ba12f816fb1df (patch)
tree60dc1b929cb56b69eb0a08a0de6e028aa806b5a7 /arch/mips/vdso
parentb071c5d7998a79919e83565ddfb98fdf6fa804bc (diff)
downloadlinux-2afb97454347f641dd2435a3956ba12f816fb1df.tar.bz2
MIPS: Fix genvdso error on rebuild
The genvdso program modifies the debug and stripped versions of the VDSOs in place, and errors if the modification has already taken place. Unfortunately this means that a rebuild which tries to rerun genvdso to generate vdso*-image.c without also rebuilding vdso.so.dbg (for example if genvdso.c is modified) hits a build error like this: arch/mips/vdso/genvdso 'arch/mips/vdso/vdso.so.dbg' already contains a '.MIPS.abiflags' section This is fixed by reorganising the rules such that unmodified .so files have a .raw suffix, and these are copied in the same rule that runs genvdso on the copies. I.e. previously we had: cmd_vdsold: link objects -> vdso.so.dbg cmd_genvdso: strip vdso.so.dbg -> vdso.so run genvdso -> vdso-image.c and modify vdso.so.dbg and vdso.so in place Now we have: cmd_vdsold: link objects -> vdso.so.dbg.raw a new cmd_objcopy based strip rule (inspired by ARM): strip vdso.so.dbg.raw -> vdso.so.raw cmd_genvdso: copy vdso.so.dbg.raw -> vdso.so.dbg copy vdso.so.raw -> vdso.so run genvdso -> vdso-image.c and modify vdso.so.dbg and vdso.so in place Signed-off-by: James Hogan <james.hogan@imgtec.com> Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/13250/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/vdso')
-rw-r--r--arch/mips/vdso/Makefile40
1 files changed, 28 insertions, 12 deletions
diff --git a/arch/mips/vdso/Makefile b/arch/mips/vdso/Makefile
index ee3617c0c5e2..b369509e9753 100644
--- a/arch/mips/vdso/Makefile
+++ b/arch/mips/vdso/Makefile
@@ -50,13 +50,17 @@ quiet_cmd_vdsold = VDSO $@
cmd_vdsold = $(CC) $(c_flags) $(VDSO_LDFLAGS) \
-Wl,-T $(filter %.lds,$^) $(filter %.o,$^) -o $@
+# Strip rule for the raw .so files
+$(obj)/%.so.raw: OBJCOPYFLAGS := -S
+$(obj)/%.so.raw: $(obj)/%.so.dbg.raw FORCE
+ $(call if_changed,objcopy)
+
hostprogs-y := genvdso
quiet_cmd_genvdso = GENVDSO $@
define cmd_genvdso
- cp $< $(<:%.dbg=%) && \
- $(OBJCOPY) -S $< $(<:%.dbg=%) && \
- $(obj)/genvdso $< $(<:%.dbg=%) $@ $(VDSO_NAME)
+ $(foreach file,$(filter %.raw,$^),cp $(file) $(file:%.raw=%) &&) \
+ $(obj)/genvdso $(<:%.raw=%) $(<:%.dbg.raw=%) $@ $(VDSO_NAME)
endef
#
@@ -66,7 +70,10 @@ endef
native-abi := $(filter -mabi=%,$(KBUILD_CFLAGS))
targets += $(obj-vdso-y)
-targets += vdso.lds vdso.so.dbg vdso.so vdso-image.c
+targets += vdso.lds
+targets += vdso.so.dbg.raw vdso.so.raw
+targets += vdso.so.dbg vdso.so
+targets += vdso-image.c
obj-vdso := $(obj-vdso-y:%.o=$(obj)/%.o)
@@ -75,10 +82,11 @@ $(obj-vdso): KBUILD_AFLAGS := $(aflags-vdso) $(native-abi)
$(obj)/vdso.lds: KBUILD_CPPFLAGS := $(native-abi)
-$(obj)/vdso.so.dbg: $(obj)/vdso.lds $(obj-vdso) FORCE
+$(obj)/vdso.so.dbg.raw: $(obj)/vdso.lds $(obj-vdso) FORCE
$(call if_changed,vdsold)
-$(obj)/vdso-image.c: $(obj)/vdso.so.dbg $(obj)/genvdso FORCE
+$(obj)/vdso-image.c: $(obj)/vdso.so.dbg.raw $(obj)/vdso.so.raw \
+ $(obj)/genvdso FORCE
$(call if_changed,genvdso)
obj-y += vdso-image.o
@@ -89,7 +97,10 @@ obj-y += vdso-image.o
# Define these outside the ifdef to ensure they are picked up by clean.
targets += $(obj-vdso-y:%.o=%-o32.o)
-targets += vdso-o32.lds vdso-o32.so.dbg vdso-o32.so vdso-o32-image.c
+targets += vdso-o32.lds
+targets += vdso-o32.so.dbg.raw vdso-o32.so.raw
+targets += vdso-o32.so.dbg vdso-o32.so
+targets += vdso-o32-image.c
ifdef CONFIG_MIPS32_O32
@@ -109,11 +120,12 @@ $(obj)/vdso-o32.lds: KBUILD_CPPFLAGS := -mabi=32
$(obj)/vdso-o32.lds: $(src)/vdso.lds.S FORCE
$(call if_changed_dep,cpp_lds_S)
-$(obj)/vdso-o32.so.dbg: $(obj)/vdso-o32.lds $(obj-vdso-o32) FORCE
+$(obj)/vdso-o32.so.dbg.raw: $(obj)/vdso-o32.lds $(obj-vdso-o32) FORCE
$(call if_changed,vdsold)
$(obj)/vdso-o32-image.c: VDSO_NAME := o32
-$(obj)/vdso-o32-image.c: $(obj)/vdso-o32.so.dbg $(obj)/genvdso FORCE
+$(obj)/vdso-o32-image.c: $(obj)/vdso-o32.so.dbg.raw $(obj)/vdso-o32.so.raw \
+ $(obj)/genvdso FORCE
$(call if_changed,genvdso)
obj-y += vdso-o32-image.o
@@ -125,7 +137,10 @@ endif
#
targets += $(obj-vdso-y:%.o=%-n32.o)
-targets += vdso-n32.lds vdso-n32.so.dbg vdso-n32.so vdso-n32-image.c
+targets += vdso-n32.lds
+targets += vdso-n32.so.dbg.raw vdso-n32.so.raw
+targets += vdso-n32.so.dbg vdso-n32.so
+targets += vdso-n32-image.c
ifdef CONFIG_MIPS32_N32
@@ -145,11 +160,12 @@ $(obj)/vdso-n32.lds: KBUILD_CPPFLAGS := -mabi=n32
$(obj)/vdso-n32.lds: $(src)/vdso.lds.S FORCE
$(call if_changed_dep,cpp_lds_S)
-$(obj)/vdso-n32.so.dbg: $(obj)/vdso-n32.lds $(obj-vdso-n32) FORCE
+$(obj)/vdso-n32.so.dbg.raw: $(obj)/vdso-n32.lds $(obj-vdso-n32) FORCE
$(call if_changed,vdsold)
$(obj)/vdso-n32-image.c: VDSO_NAME := n32
-$(obj)/vdso-n32-image.c: $(obj)/vdso-n32.so.dbg $(obj)/genvdso FORCE
+$(obj)/vdso-n32-image.c: $(obj)/vdso-n32.so.dbg.raw $(obj)/vdso-n32.so.raw \
+ $(obj)/genvdso FORCE
$(call if_changed,genvdso)
obj-y += vdso-n32-image.o