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Subject[PATCH] x86_64 vDSO: install unstripped copies on disk
Date
This keeps an unstripped copy of the vDSO images built before they are
stripped and embedded in the kernel. The unstripped copies get installed
in $(MODLIB)/vdso/ by "make install". These files can be useful when they
contain source-level debugging information.

Signed-off-by: Roland McGrath <roland@redhat.com>
---
arch/x86_64/Makefile | 1 +
arch/x86_64/vdso/Makefile | 20 ++++++++++++++++----
2 files changed, 17 insertions(+), 4 deletions(-)
diff --git a/arch/x86_64/Makefile b/arch/x86_64/Makefile
index 93fc1f2..c0905ae 100644
--- a/arch/x86_64/Makefile
+++ b/arch/x86_64/Makefile
@@ -107,6 +107,7 @@ fdimage fdimage144 fdimage288 isoimage: vmlinux

install:
$(Q)$(MAKE) $(build)=$(boot) BOOTIMAGE=$(BOOTIMAGE) $@
+ $(Q)$(MAKE) $(build)=arch/x86_64/vdso $@
ifeq ($(CONFIG_IA32_EMULATION),y)
$(Q)$(MAKE) $(build)=arch/x86_64/ia32 $@
endif
diff --git a/arch/x86_64/vdso/Makefile b/arch/x86_64/vdso/Makefile
index faaa72f..20ecf05 100644
--- a/arch/x86_64/vdso/Makefile
+++ b/arch/x86_64/vdso/Makefile
@@ -13,7 +13,7 @@ vobjs := $(foreach F,$(vobjs-y),$(obj)/$F)

$(obj)/vdso.o: $(obj)/vdso.so

-targets += vdso.so vdso.lds $(vobjs-y) vdso-syms.o
+targets += vdso.so vdso.so.dbg vdso.lds $(vobjs-y) vdso-syms.o

# The DSO images are built using a special linker script.
quiet_cmd_syscall = SYSCALL $@
@@ -25,14 +25,18 @@ export CPPFLAGS_vdso.lds += -P -C -U$(ARCH)
vdso-flags = -fPIC -shared -Wl,-soname=linux-vdso.so.1 \
$(call ld-option, -Wl$(comma)--hash-style=sysv) \
-Wl,-z,max-page-size=4096 -Wl,-z,common-page-size=4096
-SYSCFLAGS_vdso.so = $(vdso-flags)
+SYSCFLAGS_vdso.so.dbg = $(vdso-flags)

$(obj)/vdso.o: $(src)/vdso.S $(obj)/vdso.so

-$(obj)/vdso.so: $(src)/vdso.lds $(vobjs) FORCE
+$(obj)/vdso.so.dbg: $(src)/vdso.lds $(vobjs) FORCE
$(call if_changed,syscall)

-CF := $(PROFILING) -mcmodel=small -fPIC -g0 -O2 -fasynchronous-unwind-tables -m64
+$(obj)/%.so: OBJCOPYFLAGS := -S
+$(obj)/%.so: $(obj)/%.so.dbg FORCE
+ $(call if_changed,objcopy)
+
+CF := $(PROFILING) -mcmodel=small -fPIC -O2 -fasynchronous-unwind-tables -m64

$(obj)/vclock_gettime.o: CFLAGS = $(CF)
$(obj)/vgetcpu.o: CFLAGS = $(CF)
@@ -47,3 +51,11 @@ $(obj)/built-in.o: ld_flags += -R $(obj)/vdso-syms.o
SYSCFLAGS_vdso-syms.o = -r -d
$(obj)/vdso-syms.o: $(src)/vdso.lds $(vobjs) FORCE
$(call if_changed,syscall)
+
+quiet_cmd_vdso_install = INSTALL $@
+ cmd_vdso_install = cp $@.dbg $(MODLIB)/vdso/$@
+vdso.so:
+ @mkdir -p $(MODLIB)/vdso
+ $(call cmd,vdso_install)
+
+install: vdso.so
-
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